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< title > GTK 4 tutorial< / title >
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< h1 id = "pango-css-and-application" > Pango, CSS and Application< / h1 >
< h2 id = "pangofontdescription" > PangoFontDescription< / h2 >
< p > PangoFontDescription is a C structure for a font. You can get font
family, style, weight and size. You can also get a string that includes
font attributes. For example, suppose that the PangoFontDescription has
a font of “Noto Sans Mono”, “Bold”, “Italic” and 12 points of size. Then
the string converted from the PangoFontDescription is “Noto Sans Mono
Bold Italic 12”.< / p >
< ul >
< li > Font family is “Noto Sans Mono”.< / li >
< li > Font style is “Italic”.< / li >
< li > Font weight is “Bold”, or 700.< / li >
< li > Font size is 12 pt.< / li >
< / ul >
< p > The font in CSS is different from the string from
PangoFontDescription.< / p >
< ul >
< li > < code > font: bold italic 12pt "Noto Sans Mono"< / code > < / li >
< li > < code > Noto Sans Mono Bold Italic 12< / code > < / li >
< / ul >
< p > So, it may be easier to use each property, i.e.
font-style, font-weight and font-size, to convert a PangoFontDescription
data to CSS.< / p >
< p > Refer to < a href = "https://docs.gtk.org/Pango/index.html" > Pango
document< / a > and < a href = "https://www.w3.org/TR/css-fonts-3/" > W3C CSS
Fonts Module Level 3< / a > for further information.< / p >
< h2 id = "converter-from-pangofontdescription-to-css" > Converter from
PangoFontDescription to CSS< / h2 >
< p > Two files < code > pfd2css.h< / code > and < code > pfd2css.c< / code > include
the converter from PangoFontDescription to CSS.< / p >
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< div class = "sourceCode" id = "cb1" > < pre
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class="sourceCode numberSource C numberLines">< code class = "sourceCode c" > < span id = "cb1-1" > < a href = "#cb1-1" > < / a > < span class = "pp" > #pragma once< / span > < / span >
< span id = "cb1-2" > < a href = "#cb1-2" > < / a > < / span >
< span id = "cb1-3" > < a href = "#cb1-3" > < / a > < span class = "pp" > #include < / span > < span class = "im" > < pango/pango.h> < / span > < / span >
< span id = "cb1-4" > < a href = "#cb1-4" > < / a > < / span >
< span id = "cb1-5" > < a href = "#cb1-5" > < / a > < span class = "co" > // Pango font description to CSS style string< / span > < / span >
< span id = "cb1-6" > < a href = "#cb1-6" > < / a > < span class = "co" > // Returned string is owned by the caller. The caller should free it when it becomes useless.< / span > < / span >
< span id = "cb1-7" > < a href = "#cb1-7" > < / a > < / span >
< span id = "cb1-8" > < a href = "#cb1-8" > < / a > < span class = "dt" > char< / span > < span class = "op" > *< / span > < / span >
< span id = "cb1-9" > < a href = "#cb1-9" > < / a > pfd2css < span class = "op" > (< / span > PangoFontDescription < span class = "op" > *< / span > pango_font_desc< span class = "op" > );< / span > < / span >
< span id = "cb1-10" > < a href = "#cb1-10" > < / a > < / span >
< span id = "cb1-11" > < a href = "#cb1-11" > < / a > < span class = "co" > // Each element (family, style, weight and size)< / span > < / span >
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< span id = "cb1-12" > < a href = "#cb1-12" > < / a > < / span >
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< span id = "cb1-13" > < a href = "#cb1-13" > < / a > < span class = "dt" > const< / span > < span class = "dt" > char< / span > < span class = "op" > *< / span > < / span >
< span id = "cb1-14" > < a href = "#cb1-14" > < / a > pfd2css_family < span class = "op" > (< / span > PangoFontDescription < span class = "op" > *< / span > pango_font_desc< span class = "op" > );< / span > < / span >
< span id = "cb1-15" > < a href = "#cb1-15" > < / a > < / span >
< span id = "cb1-16" > < a href = "#cb1-16" > < / a > < span class = "dt" > const< / span > < span class = "dt" > char< / span > < span class = "op" > *< / span > < / span >
< span id = "cb1-17" > < a href = "#cb1-17" > < / a > pfd2css_style < span class = "op" > (< / span > PangoFontDescription < span class = "op" > *< / span > pango_font_desc< span class = "op" > );< / span > < / span >
< span id = "cb1-18" > < a href = "#cb1-18" > < / a > < / span >
< span id = "cb1-19" > < a href = "#cb1-19" > < / a > < span class = "dt" > int< / span > < / span >
< span id = "cb1-20" > < a href = "#cb1-20" > < / a > pfd2css_weight < span class = "op" > (< / span > PangoFontDescription < span class = "op" > *< / span > pango_font_desc< span class = "op" > );< / span > < / span >
< span id = "cb1-21" > < a href = "#cb1-21" > < / a > < / span >
< span id = "cb1-22" > < a href = "#cb1-22" > < / a > < span class = "co" > // Returned string is owned by the caller. The caller should free it when it becomes useless.< / span > < / span >
< span id = "cb1-23" > < a href = "#cb1-23" > < / a > < span class = "dt" > char< / span > < span class = "op" > *< / span > < / span >
< span id = "cb1-24" > < a href = "#cb1-24" > < / a > pfd2css_size < span class = "op" > (< / span > PangoFontDescription < span class = "op" > *< / span > pango_font_desc< span class = "op" > );< / span > < / span > < / code > < / pre > < / div >
< p > The five functions are public. The first function is a convenient
function to set other four CSS at once.< / p >
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< div class = "sourceCode" id = "cb2" > < pre
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class="sourceCode numberSource C numberLines">< code class = "sourceCode c" > < span id = "cb2-1" > < a href = "#cb2-1" > < / a > < span class = "pp" > #include < / span > < span class = "im" > < pango/pango.h> < / span > < / span >
< span id = "cb2-2" > < a href = "#cb2-2" > < / a > < span class = "pp" > #include < / span > < span class = "im" > " pfd2css.h" < / span > < / span >
< span id = "cb2-3" > < a href = "#cb2-3" > < / a > < / span >
< span id = "cb2-4" > < a href = "#cb2-4" > < / a > < span class = "co" > // Pango font description to CSS style string< / span > < / span >
< span id = "cb2-5" > < a href = "#cb2-5" > < / a > < span class = "co" > // Returned string is owned by caller. The caller should free it when it is useless.< / span > < / span >
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< span id = "cb2-6" > < a href = "#cb2-6" > < / a > < / span >
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< span id = "cb2-7" > < a href = "#cb2-7" > < / a > < span class = "dt" > char< / span > < span class = "op" > *< / span > < / span >
< span id = "cb2-8" > < a href = "#cb2-8" > < / a > pfd2css < span class = "op" > (< / span > PangoFontDescription < span class = "op" > *< / span > pango_font_desc< span class = "op" > )< / span > < span class = "op" > {< / span > < / span >
< span id = "cb2-9" > < a href = "#cb2-9" > < / a > < span class = "dt" > char< / span > < span class = "op" > *< / span > fontsize< span class = "op" > ;< / span > < / span >
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< span id = "cb2-10" > < a href = "#cb2-10" > < / a > < / span >
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< span id = "cb2-11" > < a href = "#cb2-11" > < / a > fontsize < span class = "op" > =< / span > pfd2css_size < span class = "op" > (< / span > pango_font_desc< span class = "op" > );< / span > < / span >
< span id = "cb2-12" > < a href = "#cb2-12" > < / a > < span class = "cf" > return< / span > g_strdup_printf < span class = "op" > (< / span > < span class = "st" > " font-family: < / span > < span class = "sc" > \" < / span > < span class = "st" > %s< / span > < span class = "sc" > \" < / span > < span class = "st" > ; font-style: %s; font-weight: %d; font-size: %s;" < / span > < span class = "op" > ,< / span > < / span >
< span id = "cb2-13" > < a href = "#cb2-13" > < / a > pfd2css_family < span class = "op" > (< / span > pango_font_desc< span class = "op" > ),< / span > pfd2css_style < span class = "op" > (< / span > pango_font_desc< span class = "op" > ),< / span > < / span >
< span id = "cb2-14" > < a href = "#cb2-14" > < / a > pfd2css_weight < span class = "op" > (< / span > pango_font_desc< span class = "op" > ),< / span > fontsize< span class = "op" > );< / span > < / span >
< span id = "cb2-15" > < a href = "#cb2-15" > < / a > g_free < span class = "op" > (< / span > fontsize< span class = "op" > );< / span > < / span >
< span id = "cb2-16" > < a href = "#cb2-16" > < / a > < span class = "op" > }< / span > < / span >
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< span id = "cb2-17" > < a href = "#cb2-17" > < / a > < / span >
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< span id = "cb2-18" > < a href = "#cb2-18" > < / a > < span class = "co" > // Each element (family, style, weight and size)< / span > < / span >
< span id = "cb2-19" > < a href = "#cb2-19" > < / a > < / span >
< span id = "cb2-20" > < a href = "#cb2-20" > < / a > < span class = "dt" > const< / span > < span class = "dt" > char< / span > < span class = "op" > *< / span > < / span >
< span id = "cb2-21" > < a href = "#cb2-21" > < / a > pfd2css_family < span class = "op" > (< / span > PangoFontDescription < span class = "op" > *< / span > pango_font_desc< span class = "op" > )< / span > < span class = "op" > {< / span > < / span >
< span id = "cb2-22" > < a href = "#cb2-22" > < / a > < span class = "cf" > return< / span > pango_font_description_get_family < span class = "op" > (< / span > pango_font_desc< span class = "op" > );< / span > < / span >
< span id = "cb2-23" > < a href = "#cb2-23" > < / a > < span class = "op" > }< / span > < / span >
< span id = "cb2-24" > < a href = "#cb2-24" > < / a > < / span >
< span id = "cb2-25" > < a href = "#cb2-25" > < / a > < span class = "dt" > const< / span > < span class = "dt" > char< / span > < span class = "op" > *< / span > < / span >
< span id = "cb2-26" > < a href = "#cb2-26" > < / a > pfd2css_style < span class = "op" > (< / span > PangoFontDescription < span class = "op" > *< / span > pango_font_desc< span class = "op" > )< / span > < span class = "op" > {< / span > < / span >
< span id = "cb2-27" > < a href = "#cb2-27" > < / a > PangoStyle pango_style < span class = "op" > =< / span > pango_font_description_get_style < span class = "op" > (< / span > pango_font_desc< span class = "op" > );< / span > < / span >
< span id = "cb2-28" > < a href = "#cb2-28" > < / a > < span class = "cf" > switch< / span > < span class = "op" > (< / span > pango_style< span class = "op" > )< / span > < span class = "op" > {< / span > < / span >
< span id = "cb2-29" > < a href = "#cb2-29" > < / a > < span class = "cf" > case< / span > PANGO_STYLE_NORMAL< span class = "op" > :< / span > < / span >
< span id = "cb2-30" > < a href = "#cb2-30" > < / a > < span class = "cf" > return< / span > < span class = "st" > " normal" < / span > < span class = "op" > ;< / span > < / span >
< span id = "cb2-31" > < a href = "#cb2-31" > < / a > < span class = "cf" > case< / span > PANGO_STYLE_ITALIC< span class = "op" > :< / span > < / span >
< span id = "cb2-32" > < a href = "#cb2-32" > < / a > < span class = "cf" > return< / span > < span class = "st" > " italic" < / span > < span class = "op" > ;< / span > < / span >
< span id = "cb2-33" > < a href = "#cb2-33" > < / a > < span class = "cf" > case< / span > PANGO_STYLE_OBLIQUE< span class = "op" > :< / span > < / span >
< span id = "cb2-34" > < a href = "#cb2-34" > < / a > < span class = "cf" > return< / span > < span class = "st" > " oblique" < / span > < span class = "op" > ;< / span > < / span >
< span id = "cb2-35" > < a href = "#cb2-35" > < / a > < span class = "cf" > default< / span > < span class = "op" > :< / span > < / span >
< span id = "cb2-36" > < a href = "#cb2-36" > < / a > < span class = "cf" > return< / span > < span class = "st" > " normal" < / span > < span class = "op" > ;< / span > < / span >
< span id = "cb2-37" > < a href = "#cb2-37" > < / a > < span class = "op" > }< / span > < / span >
< span id = "cb2-38" > < a href = "#cb2-38" > < / a > < span class = "op" > }< / span > < / span >
< span id = "cb2-39" > < a href = "#cb2-39" > < / a > < / span >
< span id = "cb2-40" > < a href = "#cb2-40" > < / a > < span class = "dt" > int< / span > < / span >
< span id = "cb2-41" > < a href = "#cb2-41" > < / a > pfd2css_weight < span class = "op" > (< / span > PangoFontDescription < span class = "op" > *< / span > pango_font_desc< span class = "op" > )< / span > < span class = "op" > {< / span > < / span >
< span id = "cb2-42" > < a href = "#cb2-42" > < / a > PangoWeight pango_weight < span class = "op" > =< / span > pango_font_description_get_weight < span class = "op" > (< / span > pango_font_desc< span class = "op" > );< / span > < / span >
< span id = "cb2-43" > < a href = "#cb2-43" > < / a > < span class = "cf" > switch< / span > < span class = "op" > (< / span > pango_weight< span class = "op" > )< / span > < span class = "op" > {< / span > < / span >
< span id = "cb2-44" > < a href = "#cb2-44" > < / a > < span class = "cf" > case< / span > PANGO_WEIGHT_THIN< span class = "op" > :< / span > < / span >
< span id = "cb2-45" > < a href = "#cb2-45" > < / a > < span class = "cf" > return< / span > < span class = "dv" > 100< / span > < span class = "op" > ;< / span > < / span >
< span id = "cb2-46" > < a href = "#cb2-46" > < / a > < span class = "cf" > case< / span > PANGO_WEIGHT_ULTRALIGHT< span class = "op" > :< / span > < / span >
< span id = "cb2-47" > < a href = "#cb2-47" > < / a > < span class = "cf" > return< / span > < span class = "dv" > 200< / span > < span class = "op" > ;< / span > < / span >
< span id = "cb2-48" > < a href = "#cb2-48" > < / a > < span class = "cf" > case< / span > PANGO_WEIGHT_LIGHT< span class = "op" > :< / span > < / span >
< span id = "cb2-49" > < a href = "#cb2-49" > < / a > < span class = "cf" > return< / span > < span class = "dv" > 300< / span > < span class = "op" > ;< / span > < / span >
< span id = "cb2-50" > < a href = "#cb2-50" > < / a > < span class = "cf" > case< / span > PANGO_WEIGHT_SEMILIGHT< span class = "op" > :< / span > < / span >
< span id = "cb2-51" > < a href = "#cb2-51" > < / a > < span class = "cf" > return< / span > < span class = "dv" > 350< / span > < span class = "op" > ;< / span > < / span >
< span id = "cb2-52" > < a href = "#cb2-52" > < / a > < span class = "cf" > case< / span > PANGO_WEIGHT_BOOK< span class = "op" > :< / span > < / span >
< span id = "cb2-53" > < a href = "#cb2-53" > < / a > < span class = "cf" > return< / span > < span class = "dv" > 380< / span > < span class = "op" > ;< / span > < / span >
< span id = "cb2-54" > < a href = "#cb2-54" > < / a > < span class = "cf" > case< / span > PANGO_WEIGHT_NORMAL< span class = "op" > :< / span > < / span >
< span id = "cb2-55" > < a href = "#cb2-55" > < / a > < span class = "cf" > return< / span > < span class = "dv" > 400< / span > < span class = "op" > ;< / span > < span class = "co" > /* or " normal" */< / span > < / span >
< span id = "cb2-56" > < a href = "#cb2-56" > < / a > < span class = "cf" > case< / span > PANGO_WEIGHT_MEDIUM< span class = "op" > :< / span > < / span >
< span id = "cb2-57" > < a href = "#cb2-57" > < / a > < span class = "cf" > return< / span > < span class = "dv" > 500< / span > < span class = "op" > ;< / span > < / span >
< span id = "cb2-58" > < a href = "#cb2-58" > < / a > < span class = "cf" > case< / span > PANGO_WEIGHT_SEMIBOLD< span class = "op" > :< / span > < / span >
< span id = "cb2-59" > < a href = "#cb2-59" > < / a > < span class = "cf" > return< / span > < span class = "dv" > 600< / span > < span class = "op" > ;< / span > < / span >
< span id = "cb2-60" > < a href = "#cb2-60" > < / a > < span class = "cf" > case< / span > PANGO_WEIGHT_BOLD< span class = "op" > :< / span > < / span >
< span id = "cb2-61" > < a href = "#cb2-61" > < / a > < span class = "cf" > return< / span > < span class = "dv" > 700< / span > < span class = "op" > ;< / span > < span class = "co" > /* or " bold" */< / span > < / span >
< span id = "cb2-62" > < a href = "#cb2-62" > < / a > < span class = "cf" > case< / span > PANGO_WEIGHT_ULTRABOLD< span class = "op" > :< / span > < / span >
< span id = "cb2-63" > < a href = "#cb2-63" > < / a > < span class = "cf" > return< / span > < span class = "dv" > 800< / span > < span class = "op" > ;< / span > < / span >
< span id = "cb2-64" > < a href = "#cb2-64" > < / a > < span class = "cf" > case< / span > PANGO_WEIGHT_HEAVY< span class = "op" > :< / span > < / span >
< span id = "cb2-65" > < a href = "#cb2-65" > < / a > < span class = "cf" > return< / span > < span class = "dv" > 900< / span > < span class = "op" > ;< / span > < / span >
< span id = "cb2-66" > < a href = "#cb2-66" > < / a > < span class = "cf" > case< / span > PANGO_WEIGHT_ULTRAHEAVY< span class = "op" > :< / span > < / span >
< span id = "cb2-67" > < a href = "#cb2-67" > < / a > < span class = "cf" > return< / span > < span class = "dv" > 900< / span > < span class = "op" > ;< / span > < span class = "co" > /* 1000 is available since CSS Fonts level 4 but GTK currently supports level 3. */< / span > < / span >
< span id = "cb2-68" > < a href = "#cb2-68" > < / a > < span class = "cf" > default< / span > < span class = "op" > :< / span > < / span >
< span id = "cb2-69" > < a href = "#cb2-69" > < / a > < span class = "cf" > return< / span > < span class = "dv" > 400< / span > < span class = "op" > ;< / span > < span class = "co" > /* " normal" */< / span > < / span >
< span id = "cb2-70" > < a href = "#cb2-70" > < / a > < span class = "op" > }< / span > < / span >
< span id = "cb2-71" > < a href = "#cb2-71" > < / a > < span class = "op" > }< / span > < / span >
< span id = "cb2-72" > < a href = "#cb2-72" > < / a > < / span >
< span id = "cb2-73" > < a href = "#cb2-73" > < / a > < span class = "dt" > char< / span > < span class = "op" > *< / span > < / span >
< span id = "cb2-74" > < a href = "#cb2-74" > < / a > pfd2css_size < span class = "op" > (< / span > PangoFontDescription < span class = "op" > *< / span > pango_font_desc< span class = "op" > )< / span > < span class = "op" > {< / span > < / span >
< span id = "cb2-75" > < a href = "#cb2-75" > < / a > < span class = "cf" > if< / span > < span class = "op" > (< / span > pango_font_description_get_size_is_absolute < span class = "op" > (< / span > pango_font_desc< span class = "op" > ))< / span > < / span >
< span id = "cb2-76" > < a href = "#cb2-76" > < / a > < span class = "cf" > return< / span > g_strdup_printf < span class = "op" > (< / span > < span class = "st" > " %dpx" < / span > < span class = "op" > ,< / span > pango_font_description_get_size < span class = "op" > (< / span > pango_font_desc< span class = "op" > )< / span > < span class = "op" > /< / span > PANGO_SCALE< span class = "op" > );< / span > < / span >
< span id = "cb2-77" > < a href = "#cb2-77" > < / a > < span class = "cf" > else< / span > < / span >
< span id = "cb2-78" > < a href = "#cb2-78" > < / a > < span class = "cf" > return< / span > g_strdup_printf < span class = "op" > (< / span > < span class = "st" > " %dpt" < / span > < span class = "op" > ,< / span > pango_font_description_get_size < span class = "op" > (< / span > pango_font_desc< span class = "op" > )< / span > < span class = "op" > /< / span > PANGO_SCALE< span class = "op" > );< / span > < / span >
< span id = "cb2-79" > < a href = "#cb2-79" > < / a > < span class = "op" > }< / span > < / span > < / code > < / pre > < / div >
< ul >
< li > The function < code > pfd2css_family< / code > returns font family.< / li >
< li > The function < code > pfd2css_style< / code > returns font style which is
one of “normal”, “italic” or “oblique”.< / li >
< li > The function < code > pfd2css_weight< / code > returns font weight in
integer. See the list below.< / li >
< li > The function < code > pfd2css_size< / code > returns font size.
< ul >
< li > If the font description size is absolute, it returns the size of
device unit, which is pixel. Otherwise the unit is point.< / li >
< li > The function < code > pango_font_description_get_size< / code > returns
the integer of the size but it is multiplied by
< code > PANGO_SCALE< / code > . So, you need to divide it by
< code > PANGO_SCALE< / code > . The < code > PANGO_SCALE< / code > is currently
1024, but this might be changed in the future. If the font size is 12pt,
the size in pango is < code > 12*PANGO_SCALE=12*1024=12288< / code > .< / li >
< / ul > < / li >
< li > The function < code > pfd2css< / code > returns a string of the font. For
example, if a font “Noto Sans Mono Bold Italic 12” is given, it returns
“font-family: Noto Sans Mono; font-style: italic; font-weight: 700;
font-size: 12pt;”.< / li >
< / ul >
< p > The font weight number is one of:< / p >
< ul >
< li > 100 - Thin< / li >
< li > 200 - Extra Light (Ultra Light)< / li >
< li > 300 - Light< / li >
< li > 400 - Normal< / li >
< li > 500 - Medium< / li >
< li > 600 - Semi Bold (Demi Bold)< / li >
< li > 700 - Bold< / li >
< li > 800 - Extra Bold (Ultra Bold)< / li >
< li > 900 - Black (Heavy)< / li >
< / ul >
< h2 id = "application-object" > Application object< / h2 >
< h3 id = "tfeapplication-class" > TfeApplication class< / h3 >
< p > TfeApplication class is a child of GtkApplication. It has some
instance variables. The header file defines the type macro and a public
function.< / p >
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< div class = "sourceCode" id = "cb3" > < pre
2023-07-15 10:27:53 +02:00
class="sourceCode numberSource C numberLines">< code class = "sourceCode c" > < span id = "cb3-1" > < a href = "#cb3-1" > < / a > < span class = "pp" > #pragma once< / span > < / span >
< span id = "cb3-2" > < a href = "#cb3-2" > < / a > < / span >
< span id = "cb3-3" > < a href = "#cb3-3" > < / a > < span class = "pp" > #include < / span > < span class = "im" > < gtk/gtk.h> < / span > < / span >
2022-04-17 13:54:42 +02:00
< span id = "cb3-4" > < a href = "#cb3-4" > < / a > < / span >
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< span id = "cb3-5" > < a href = "#cb3-5" > < / a > < span class = "pp" > #define TFE_TYPE_APPLICATION tfe_application_get_type ()< / span > < / span >
< span id = "cb3-6" > < a href = "#cb3-6" > < / a > G_DECLARE_FINAL_TYPE < span class = "op" > (< / span > TfeApplication< span class = "op" > ,< / span > tfe_application< span class = "op" > ,< / span > TFE< span class = "op" > ,< / span > APPLICATION< span class = "op" > ,< / span > GtkApplication< span class = "op" > )< / span > < / span >
< span id = "cb3-7" > < a href = "#cb3-7" > < / a > < / span >
< span id = "cb3-8" > < a href = "#cb3-8" > < / a > TfeApplication < span class = "op" > *< / span > < / span >
< span id = "cb3-9" > < a href = "#cb3-9" > < / a > tfe_application_new < span class = "op" > (< / span > < span class = "dt" > const< / span > < span class = "dt" > char< / span > < span class = "op" > *< / span > application_id< span class = "op" > ,< / span > GApplicationFlags flag< span class = "op" > );< / span > < / span > < / code > < / pre > < / div >
< p > The following code is extracted from < code > tfeapplication.c< / code > .
It builds TfeApplication class and instance.< / p >
< div class = "sourceCode" id = "cb4" > < pre class = "sourceCode C" > < code class = "sourceCode c" > < span id = "cb4-1" > < a href = "#cb4-1" aria-hidden = "true" tabindex = "-1" > < / a > < span class = "pp" > #include < / span > < span class = "im" > < gtk/gtk.h> < / span > < / span >
< span id = "cb4-2" > < a href = "#cb4-2" aria-hidden = "true" tabindex = "-1" > < / a > < span class = "pp" > #include < / span > < span class = "im" > " tfeapplication.h" < / span > < / span >
< span id = "cb4-3" > < a href = "#cb4-3" aria-hidden = "true" tabindex = "-1" > < / a > < / span >
< span id = "cb4-4" > < a href = "#cb4-4" aria-hidden = "true" tabindex = "-1" > < / a > < span class = "kw" > struct< / span > _TfeApplication < span class = "op" > {< / span > < / span >
< span id = "cb4-5" > < a href = "#cb4-5" aria-hidden = "true" tabindex = "-1" > < / a > GtkApplication parent< span class = "op" > ;< / span > < / span >
< span id = "cb4-6" > < a href = "#cb4-6" aria-hidden = "true" tabindex = "-1" > < / a > TfeWindow < span class = "op" > *< / span > win< span class = "op" > ;< / span > < / span >
< span id = "cb4-7" > < a href = "#cb4-7" aria-hidden = "true" tabindex = "-1" > < / a > GSettings < span class = "op" > *< / span > settings< span class = "op" > ;< / span > < / span >
< span id = "cb4-8" > < a href = "#cb4-8" aria-hidden = "true" tabindex = "-1" > < / a > GtkCssProvider < span class = "op" > *< / span > provider< span class = "op" > ;< / span > < / span >
< span id = "cb4-9" > < a href = "#cb4-9" aria-hidden = "true" tabindex = "-1" > < / a > < span class = "op" > };< / span > < / span >
< span id = "cb4-10" > < a href = "#cb4-10" aria-hidden = "true" tabindex = "-1" > < / a > < / span >
< span id = "cb4-11" > < a href = "#cb4-11" aria-hidden = "true" tabindex = "-1" > < / a > G_DEFINE_FINAL_TYPE < span class = "op" > (< / span > TfeApplication< span class = "op" > ,< / span > tfe_application< span class = "op" > ,< / span > GTK_TYPE_APPLICATION< span class = "op" > )< / span > < / span >
< span id = "cb4-12" > < a href = "#cb4-12" aria-hidden = "true" tabindex = "-1" > < / a > < / span >
< span id = "cb4-13" > < a href = "#cb4-13" aria-hidden = "true" tabindex = "-1" > < / a > < span class = "dt" > static< / span > < span class = "dt" > void< / span > < / span >
< span id = "cb4-14" > < a href = "#cb4-14" aria-hidden = "true" tabindex = "-1" > < / a > tfe_application_dispose < span class = "op" > (< / span > GObject < span class = "op" > *< / span > gobject< span class = "op" > )< / span > < span class = "op" > {< / span > < / span >
< span id = "cb4-15" > < a href = "#cb4-15" aria-hidden = "true" tabindex = "-1" > < / a > TfeApplication < span class = "op" > *< / span > app < span class = "op" > =< / span > TFE_APPLICATION < span class = "op" > (< / span > gobject< span class = "op" > );< / span > < / span >
< span id = "cb4-16" > < a href = "#cb4-16" aria-hidden = "true" tabindex = "-1" > < / a > < / span >
< span id = "cb4-17" > < a href = "#cb4-17" aria-hidden = "true" tabindex = "-1" > < / a > g_clear_object < span class = "op" > (& < / span > app< span class = "op" > -> < / span > settings< span class = "op" > );< / span > < / span >
< span id = "cb4-18" > < a href = "#cb4-18" aria-hidden = "true" tabindex = "-1" > < / a > g_clear_object < span class = "op" > (& < / span > app< span class = "op" > -> < / span > provider< span class = "op" > );< / span > < / span >
< span id = "cb4-19" > < a href = "#cb4-19" aria-hidden = "true" tabindex = "-1" > < / a > G_OBJECT_CLASS < span class = "op" > (< / span > tfe_application_parent_class< span class = "op" > )-> < / span > dispose < span class = "op" > (< / span > gobject< span class = "op" > );< / span > < / span >
< span id = "cb4-20" > < a href = "#cb4-20" aria-hidden = "true" tabindex = "-1" > < / a > < span class = "op" > }< / span > < / span >
< span id = "cb4-21" > < a href = "#cb4-21" aria-hidden = "true" tabindex = "-1" > < / a > < / span >
< span id = "cb4-22" > < a href = "#cb4-22" aria-hidden = "true" tabindex = "-1" > < / a > < span class = "dt" > static< / span > < span class = "dt" > void< / span > < / span >
< span id = "cb4-23" > < a href = "#cb4-23" aria-hidden = "true" tabindex = "-1" > < / a > tfe_application_init < span class = "op" > (< / span > TfeApplication < span class = "op" > *< / span > app< span class = "op" > )< / span > < span class = "op" > {< / span > < / span >
< span id = "cb4-24" > < a href = "#cb4-24" aria-hidden = "true" tabindex = "-1" > < / a > app< span class = "op" > -> < / span > settings < span class = "op" > =< / span > g_settings_new < span class = "op" > (< / span > < span class = "st" > " com.github.ToshioCP.tfe" < / span > < span class = "op" > );< / span > < / span >
< span id = "cb4-25" > < a href = "#cb4-25" aria-hidden = "true" tabindex = "-1" > < / a > g_signal_connect < span class = "op" > (< / span > app< span class = "op" > -> < / span > settings< span class = "op" > ,< / span > < span class = "st" > " changed::font-desc" < / span > < span class = "op" > ,< / span > G_CALLBACK < span class = "op" > (< / span > changed_font_cb< span class = "op" > ),< / span > app< span class = "op" > );< / span > < / span >
< span id = "cb4-26" > < a href = "#cb4-26" aria-hidden = "true" tabindex = "-1" > < / a > app< span class = "op" > -> < / span > provider < span class = "op" > =< / span > gtk_css_provider_new < span class = "op" > ();< / span > < / span >
< span id = "cb4-27" > < a href = "#cb4-27" aria-hidden = "true" tabindex = "-1" > < / a > < span class = "op" > }< / span > < / span >
< span id = "cb4-28" > < a href = "#cb4-28" aria-hidden = "true" tabindex = "-1" > < / a > < / span >
< span id = "cb4-29" > < a href = "#cb4-29" aria-hidden = "true" tabindex = "-1" > < / a > < span class = "dt" > static< / span > < span class = "dt" > void< / span > < / span >
< span id = "cb4-30" > < a href = "#cb4-30" aria-hidden = "true" tabindex = "-1" > < / a > tfe_application_class_init < span class = "op" > (< / span > TfeApplicationClass < span class = "op" > *< / span > class< span class = "op" > )< / span > < span class = "op" > {< / span > < / span >
< span id = "cb4-31" > < a href = "#cb4-31" aria-hidden = "true" tabindex = "-1" > < / a > G_OBJECT_CLASS < span class = "op" > (< / span > class< span class = "op" > )-> < / span > dispose < span class = "op" > =< / span > tfe_application_dispose< span class = "op" > ;< / span > < / span >
< span id = "cb4-32" > < a href = "#cb4-32" aria-hidden = "true" tabindex = "-1" > < / a > G_APPLICATION_CLASS < span class = "op" > (< / span > class< span class = "op" > )-> < / span > startup < span class = "op" > =< / span > app_startup< span class = "op" > ;< / span > < / span >
< span id = "cb4-33" > < a href = "#cb4-33" aria-hidden = "true" tabindex = "-1" > < / a > G_APPLICATION_CLASS < span class = "op" > (< / span > class< span class = "op" > )-> < / span > activate < span class = "op" > =< / span > app_activate< span class = "op" > ;< / span > < / span >
< span id = "cb4-34" > < a href = "#cb4-34" aria-hidden = "true" tabindex = "-1" > < / a > G_APPLICATION_CLASS < span class = "op" > (< / span > class< span class = "op" > )-> < / span > open < span class = "op" > =< / span > app_open< span class = "op" > ;< / span > < / span >
< span id = "cb4-35" > < a href = "#cb4-35" aria-hidden = "true" tabindex = "-1" > < / a > < span class = "op" > }< / span > < / span >
< span id = "cb4-36" > < a href = "#cb4-36" aria-hidden = "true" tabindex = "-1" > < / a > < / span >
< span id = "cb4-37" > < a href = "#cb4-37" aria-hidden = "true" tabindex = "-1" > < / a > TfeApplication < span class = "op" > *< / span > < / span >
< span id = "cb4-38" > < a href = "#cb4-38" aria-hidden = "true" tabindex = "-1" > < / a > tfe_application_new < span class = "op" > (< / span > < span class = "dt" > const< / span > < span class = "dt" > char< / span > < span class = "op" > *< / span > application_id< span class = "op" > ,< / span > GApplicationFlags flag< span class = "op" > )< / span > < span class = "op" > {< / span > < / span >
< span id = "cb4-39" > < a href = "#cb4-39" aria-hidden = "true" tabindex = "-1" > < / a > < span class = "cf" > return< / span > TFE_APPLICATION < span class = "op" > (< / span > g_object_new < span class = "op" > (< / span > TFE_TYPE_APPLICATION< span class = "op" > ,< / span > < span class = "st" > " application-id" < / span > < span class = "op" > ,< / span > application_id< span class = "op" > ,< / span > < span class = "st" > " flags" < / span > < span class = "op" > ,< / span > flag< span class = "op" > ,< / span > NULL< span class = "op" > ));< / span > < / span >
< span id = "cb4-40" > < a href = "#cb4-40" aria-hidden = "true" tabindex = "-1" > < / a > < span class = "op" > }< / span > < / span > < / code > < / pre > < / div >
< ul >
< li > The structure < code > _TfeApplication< / code > is defined. It has four
members. One is its parents and the others are kinds of instance
variables. The members are usually initialized in the instance
initialization function. And they are released in the disposal function
or freed in the finalization function. The members are:
< ul >
< li > win: main window instance< / li >
< li > settings: GSettings instance.it is bound to “font-desc” item in the
GSettings< / li >
< li > provider: a provider for the font of the textview.< / li >
< / ul > < / li >
< li > The macro < code > G_DEFINE_FINAL_TYPE< / code > defines
< code > tfe_application_get_type< / code > function and some other useful
things.< / li >
< li > The function < code > tfe_application_class_init< / code > initializes the
TfeApplication class. It overrides four class methods. Three class
methods < code > startup< / code > , < code > activate< / code > and
< code > open< / code > points the default signal handlers. The overriding
changes the default handlers. You can connect the handlers with
< code > g_signal_connect< / code > macro but the result is different. The
macro connects a user handler to the signal. The default handler still
exists and no change is made to them.< / li >
< li > The function < code > tfe_application_init< / code > initializes an
instance.
< ul >
< li > Creates a new GSettings instance and make
< code > app-> settings< / code > point it. Then connects the handler
< code > changed_font_cb< / code > to the “changed::font-desc” signal.< / li >
< li > Creates a new GtkCssProvider instance and make
< code > app-> provider< / code > point it.< / li >
< / ul > < / li >
< li > The function < code > tfe_application_dispose< / code > releases the
GSettings and GtkCssProvider instances. Then, call the parent’
handler. It is called “chaining up”. See < a
href="https://docs.gtk.org/gobject/tutorial.html#chaining-up">GObject
document< / a > .< / li >
< / ul >
< h3 id = "startup-signal-handlers" > Startup signal handlers< / h3 >
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< div class = "sourceCode" id = "cb5" > < pre
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class="sourceCode numberSource C numberLines">< code class = "sourceCode c" > < span id = "cb5-1" > < a href = "#cb5-1" > < / a > < span class = "dt" > static< / span > < span class = "dt" > void< / span > < / span >
< span id = "cb5-2" > < a href = "#cb5-2" > < / a > app_startup < span class = "op" > (< / span > GApplication < span class = "op" > *< / span > application< span class = "op" > )< / span > < span class = "op" > {< / span > < / span >
< span id = "cb5-3" > < a href = "#cb5-3" > < / a > TfeApplication < span class = "op" > *< / span > app < span class = "op" > =< / span > TFE_APPLICATION < span class = "op" > (< / span > application< span class = "op" > );< / span > < / span >
< span id = "cb5-4" > < a href = "#cb5-4" > < / a > < span class = "dt" > int< / span > i< span class = "op" > ;< / span > < / span >
< span id = "cb5-5" > < a href = "#cb5-5" > < / a > GtkCssProvider < span class = "op" > *< / span > provider < span class = "op" > =< / span > gtk_css_provider_new < span class = "op" > ();< / span > < / span >
< span id = "cb5-6" > < a href = "#cb5-6" > < / a > GdkDisplay < span class = "op" > *< / span > display< span class = "op" > ;< / span > < / span >
< span id = "cb5-7" > < a href = "#cb5-7" > < / a > < / span >
< span id = "cb5-8" > < a href = "#cb5-8" > < / a > G_APPLICATION_CLASS < span class = "op" > (< / span > tfe_application_parent_class< span class = "op" > )-> < / span > startup < span class = "op" > (< / span > application< span class = "op" > );< / span > < / span >
< span id = "cb5-9" > < a href = "#cb5-9" > < / a > < / span >
< span id = "cb5-10" > < a href = "#cb5-10" > < / a > app< span class = "op" > -> < / span > win < span class = "op" > =< / span > TFE_WINDOW < span class = "op" > (< / span > tfe_window_new < span class = "op" > (< / span > GTK_APPLICATION < span class = "op" > (< / span > app< span class = "op" > )));< / span > < / span >
< span id = "cb5-11" > < a href = "#cb5-11" > < / a > < / span >
< span id = "cb5-12" > < a href = "#cb5-12" > < / a > gtk_css_provider_load_from_data < span class = "op" > (< / span > provider< span class = "op" > ,< / span > < span class = "st" > " textview {padding: 10px;}" < / span > < span class = "op" > ,< / span > < span class = "op" > -< / span > < span class = "dv" > 1< / span > < span class = "op" > );< / span > < / span >
< span id = "cb5-13" > < a href = "#cb5-13" > < / a > display < span class = "op" > =< / span > gdk_display_get_default < span class = "op" > ();< / span > < / span >
< span id = "cb5-14" > < a href = "#cb5-14" > < / a > gtk_style_context_add_provider_for_display < span class = "op" > (< / span > display< span class = "op" > ,< / span > GTK_STYLE_PROVIDER < span class = "op" > (< / span > provider< span class = "op" > ),< / span > < / span >
< span id = "cb5-15" > < a href = "#cb5-15" > < / a > GTK_STYLE_PROVIDER_PRIORITY_APPLICATION< span class = "op" > );< / span > < / span >
< span id = "cb5-16" > < a href = "#cb5-16" > < / a > g_object_unref < span class = "op" > (< / span > provider< span class = "op" > );< / span > < / span >
< span id = "cb5-17" > < a href = "#cb5-17" > < / a > gtk_style_context_add_provider_for_display < span class = "op" > (< / span > display< span class = "op" > ,< / span > GTK_STYLE_PROVIDER < span class = "op" > (< / span > app< span class = "op" > -> < / span > provider< span class = "op" > ),< / span > < / span >
< span id = "cb5-18" > < a href = "#cb5-18" > < / a > GTK_STYLE_PROVIDER_PRIORITY_APPLICATION< span class = "op" > );< / span > < / span >
< span id = "cb5-19" > < a href = "#cb5-19" > < / a > < / span >
< span id = "cb5-20" > < a href = "#cb5-20" > < / a > changed_font_cb < span class = "op" > (< / span > app< span class = "op" > -> < / span > settings< span class = "op" > ,< / span > < span class = "st" > " font-desc" < / span > < span class = "op" > ,< / span > app< span class = "op" > );< / span > < span class = "co" > // Sets the text view font to the font from the gsettings data base.< / span > < / span >
< span id = "cb5-21" > < a href = "#cb5-21" > < / a > < / span >
< span id = "cb5-22" > < a href = "#cb5-22" > < / a > < span class = "co" > /* ----- accelerator ----- */< / span > < / span >
< span id = "cb5-23" > < a href = "#cb5-23" > < / a > < span class = "kw" > struct< / span > < span class = "op" > {< / span > < / span >
< span id = "cb5-24" > < a href = "#cb5-24" > < / a > < span class = "dt" > const< / span > < span class = "dt" > char< / span > < span class = "op" > *< / span > action< span class = "op" > ;< / span > < / span >
< span id = "cb5-25" > < a href = "#cb5-25" > < / a > < span class = "dt" > const< / span > < span class = "dt" > char< / span > < span class = "op" > *< / span > accels< span class = "op" > [< / span > < span class = "dv" > 2< / span > < span class = "op" > ];< / span > < / span >
< span id = "cb5-26" > < a href = "#cb5-26" > < / a > < span class = "op" > }< / span > action_accels< span class = "op" > []< / span > < span class = "op" > =< / span > < span class = "op" > {< / span > < / span >
< span id = "cb5-27" > < a href = "#cb5-27" > < / a > < span class = "op" > {< / span > < span class = "st" > " win.open" < / span > < span class = "op" > ,< / span > < span class = "op" > {< / span > < span class = "st" > " < Control> o" < / span > < span class = "op" > ,< / span > NULL < span class = "op" > }< / span > < span class = "op" > },< / span > < / span >
< span id = "cb5-28" > < a href = "#cb5-28" > < / a > < span class = "op" > {< / span > < span class = "st" > " win.save" < / span > < span class = "op" > ,< / span > < span class = "op" > {< / span > < span class = "st" > " < Control> s" < / span > < span class = "op" > ,< / span > NULL < span class = "op" > }< / span > < span class = "op" > },< / span > < / span >
< span id = "cb5-29" > < a href = "#cb5-29" > < / a > < span class = "op" > {< / span > < span class = "st" > " win.close" < / span > < span class = "op" > ,< / span > < span class = "op" > {< / span > < span class = "st" > " < Control> w" < / span > < span class = "op" > ,< / span > NULL < span class = "op" > }< / span > < span class = "op" > },< / span > < / span >
< span id = "cb5-30" > < a href = "#cb5-30" > < / a > < span class = "op" > {< / span > < span class = "st" > " win.new" < / span > < span class = "op" > ,< / span > < span class = "op" > {< / span > < span class = "st" > " < Control> n" < / span > < span class = "op" > ,< / span > NULL < span class = "op" > }< / span > < span class = "op" > },< / span > < / span >
< span id = "cb5-31" > < a href = "#cb5-31" > < / a > < span class = "op" > {< / span > < span class = "st" > " win.saveas" < / span > < span class = "op" > ,< / span > < span class = "op" > {< / span > < span class = "st" > " < Shift> < Control> s" < / span > < span class = "op" > ,< / span > NULL < span class = "op" > }< / span > < span class = "op" > },< / span > < / span >
< span id = "cb5-32" > < a href = "#cb5-32" > < / a > < span class = "op" > {< / span > < span class = "st" > " win.close-all" < / span > < span class = "op" > ,< / span > < span class = "op" > {< / span > < span class = "st" > " < Control> q" < / span > < span class = "op" > ,< / span > NULL < span class = "op" > }< / span > < span class = "op" > },< / span > < / span >
< span id = "cb5-33" > < a href = "#cb5-33" > < / a > < span class = "op" > };< / span > < / span >
< span id = "cb5-34" > < a href = "#cb5-34" > < / a > < / span >
< span id = "cb5-35" > < a href = "#cb5-35" > < / a > < span class = "cf" > for< / span > < span class = "op" > (< / span > i < span class = "op" > =< / span > < span class = "dv" > 0< / span > < span class = "op" > ;< / span > i < span class = "op" > < < / span > G_N_ELEMENTS< span class = "op" > (< / span > action_accels< span class = "op" > );< / span > i< span class = "op" > ++)< / span > < / span >
< span id = "cb5-36" > < a href = "#cb5-36" > < / a > gtk_application_set_accels_for_action< span class = "op" > (< / span > GTK_APPLICATION< span class = "op" > (< / span > app< span class = "op" > ),< / span > action_accels< span class = "op" > [< / span > i< span class = "op" > ].< / span > action< span class = "op" > ,< / span > action_accels< span class = "op" > [< / span > i< span class = "op" > ].< / span > accels< span class = "op" > );< / span > < / span >
< span id = "cb5-37" > < a href = "#cb5-37" > < / a > < span class = "op" > }< / span > < / span > < / code > < / pre > < / div >
< p > The function < code > app_startup< / code > replace the default signal
handlers. It does five things.< / p >
< ul >
< li > Calls the parent’
“startup” default handler runs before user handlers. So the call for the
parent’ < / li >
< li > Creates the main window. This application has only one top level
window. In that case, it is a good way to create the window in the
startup handler, which is called only once. Activate or open handlers
can be called twice or more. Therefore, if you create a window in the
activate or open handler, two or more windows can be created.< / li >
< li > Sets the default display CSS to “textview {padding: 10px;}”. It sets
the GtkTextView, or TfeTextView, padding to 10px and makes the text
easier to read. This CSS is fixed and never changed through the
application life.< / li >
< li > Adds another CSS provider, which is pointed by
< code > app-> provider< / code > , to the default display. This CSS depends
on the GSettings “font-desc” value and it can be changed during the
application life time. And calls < code > changed_font_cb< / code > to update
the font CSS setting.< / li >
< li > Sets application accelerator with the function
< code > gtk_application_set_accels_for_action< / code > . Accelerators are
kinds of short cut key functions. For example, < code > Ctrl+O< / code > is an
accelerator to activate “open” action. Accelerators are written in the
array < code > action-accels[]< / code > . Its element is a structure
< code > struct {const char *action; const char *accels[2];}< / code > . The
member < code > action< / code > is an action name. The member
< code > accels< / code > is an array of two pointers. For example,
< code > {"win.open", { "< Control> o", NULL }}< / code > tells that the
accelerator < code > Ctrl+O< / code > is connected to the “win.open” action.
The second element of < code > accels< / code > is NULL which is the end mark.
You can define more than one accelerator keys and the list must ends
with NULL (zero). If you want to do so, the array length needs to be
three or more. For example,
< code > {"win.open", { "< Control> o", "< Alt> o", NULL }}< / code >
means two accelerators < code > Ctrl+O< / code > and < code > Alt+O< / code > is
connected to the “win.open” action. The parser recognizes
“< control> o”, “< Shift> < Alt> F2”, “< Ctrl> minus”
and so on. If you want to use symbol key like “< Ctrl> -”, use
“< Ctrl> minus” instead. Such relation between lower case and symbol
(character code) is specified in < a
href="https://gitlab.gnome.org/GNOME/gtk/-/blob/master/gdk/gdkkeysyms.h">< code > gdkkeysyms.h< / code > < / a >
in the GTK 4 source code.< / li >
< / ul >
< h3 id = "activate-and-open-signal-handlers" > Activate and open signal
handlers< / h3 >
< p > Two functions < code > app_activate< / code > and < code > app_open< / code >
replace the default signal handlers.< / p >
2023-01-19 12:52:56 +01:00
< div class = "sourceCode" id = "cb6" > < pre
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class="sourceCode numberSource C numberLines">< code class = "sourceCode c" > < span id = "cb6-1" > < a href = "#cb6-1" > < / a > < span class = "dt" > static< / span > < span class = "dt" > void< / span > < / span >
< span id = "cb6-2" > < a href = "#cb6-2" > < / a > app_activate < span class = "op" > (< / span > GApplication < span class = "op" > *< / span > application< span class = "op" > )< / span > < span class = "op" > {< / span > < / span >
< span id = "cb6-3" > < a href = "#cb6-3" > < / a > TfeApplication < span class = "op" > *< / span > app < span class = "op" > =< / span > TFE_APPLICATION < span class = "op" > (< / span > application< span class = "op" > );< / span > < / span >
< span id = "cb6-4" > < a href = "#cb6-4" > < / a > < / span >
< span id = "cb6-5" > < a href = "#cb6-5" > < / a > tfe_window_notebook_page_new < span class = "op" > (< / span > app< span class = "op" > -> < / span > win< span class = "op" > );< / span > < / span >
< span id = "cb6-6" > < a href = "#cb6-6" > < / a > gtk_window_present < span class = "op" > (< / span > GTK_WINDOW < span class = "op" > (< / span > app< span class = "op" > -> < / span > win< span class = "op" > ));< / span > < / span >
< span id = "cb6-7" > < a href = "#cb6-7" > < / a > < span class = "op" > }< / span > < / span >
< span id = "cb6-8" > < a href = "#cb6-8" > < / a > < / span >
< span id = "cb6-9" > < a href = "#cb6-9" > < / a > < span class = "dt" > static< / span > < span class = "dt" > void< / span > < / span >
< span id = "cb6-10" > < a href = "#cb6-10" > < / a > app_open < span class = "op" > (< / span > GApplication < span class = "op" > *< / span > application< span class = "op" > ,< / span > GFile < span class = "op" > **< / span > files< span class = "op" > ,< / span > gint n_files< span class = "op" > ,< / span > < span class = "dt" > const< / span > gchar < span class = "op" > *< / span > hint< span class = "op" > )< / span > < span class = "op" > {< / span > < / span >
< span id = "cb6-11" > < a href = "#cb6-11" > < / a > TfeApplication < span class = "op" > *< / span > app < span class = "op" > =< / span > TFE_APPLICATION < span class = "op" > (< / span > application< span class = "op" > );< / span > < / span >
< span id = "cb6-12" > < a href = "#cb6-12" > < / a > < / span >
< span id = "cb6-13" > < a href = "#cb6-13" > < / a > tfe_window_notebook_page_new_with_files < span class = "op" > (< / span > app< span class = "op" > -> < / span > win< span class = "op" > ,< / span > files< span class = "op" > ,< / span > n_files< span class = "op" > );< / span > < / span >
< span id = "cb6-14" > < a href = "#cb6-14" > < / a > gtk_window_present < span class = "op" > (< / span > GTK_WINDOW < span class = "op" > (< / span > app< span class = "op" > -> < / span > win< span class = "op" > ));< / span > < / span >
< span id = "cb6-15" > < a href = "#cb6-15" > < / a > < span class = "op" > }< / span > < / span > < / code > < / pre > < / div >
< p > The original default handlers don’ ’
need to chain up to the parent’
notebook pages and show the top level window.< / p >
< h3 id = "css-font-setting" > CSS font setting< / h3 >
2023-01-19 12:52:56 +01:00
< div class = "sourceCode" id = "cb7" > < pre
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class="sourceCode numberSource C numberLines">< code class = "sourceCode c" > < span id = "cb7-1" > < a href = "#cb7-1" > < / a > < span class = "dt" > static< / span > < span class = "dt" > void< / span > < / span >
< span id = "cb7-2" > < a href = "#cb7-2" > < / a > changed_font_cb < span class = "op" > (< / span > GSettings < span class = "op" > *< / span > settings< span class = "op" > ,< / span > < span class = "dt" > char< / span > < span class = "op" > *< / span > key< span class = "op" > ,< / span > gpointer user_data< span class = "op" > )< / span > < span class = "op" > {< / span > < / span >
< span id = "cb7-3" > < a href = "#cb7-3" > < / a > TfeApplication < span class = "op" > *< / span > app < span class = "op" > =< / span > TFE_APPLICATION < span class = "op" > (< / span > user_data< span class = "op" > );< / span > < / span >
< span id = "cb7-4" > < a href = "#cb7-4" > < / a > < span class = "dt" > char< / span > < span class = "op" > *< / span > font< span class = "op" > ,< / span > < span class = "op" > *< / span > s< span class = "op" > ,< / span > < span class = "op" > *< / span > css< span class = "op" > ;< / span > < / span >
< span id = "cb7-5" > < a href = "#cb7-5" > < / a > PangoFontDescription < span class = "op" > *< / span > pango_font_desc< span class = "op" > ;< / span > < / span >
< span id = "cb7-6" > < a href = "#cb7-6" > < / a > < / span >
< span id = "cb7-7" > < a href = "#cb7-7" > < / a > < span class = "cf" > if< / span > < span class = "op" > (< / span > g_strcmp0< span class = "op" > (< / span > key< span class = "op" > ,< / span > < span class = "st" > " font-desc" < / span > < span class = "op" > )< / span > < span class = "op" > !=< / span > < span class = "dv" > 0< / span > < span class = "op" > )< / span > < / span >
< span id = "cb7-8" > < a href = "#cb7-8" > < / a > < span class = "cf" > return< / span > < span class = "op" > ;< / span > < / span >
< span id = "cb7-9" > < a href = "#cb7-9" > < / a > font < span class = "op" > =< / span > g_settings_get_string < span class = "op" > (< / span > app< span class = "op" > -> < / span > settings< span class = "op" > ,< / span > < span class = "st" > " font-desc" < / span > < span class = "op" > );< / span > < / span >
< span id = "cb7-10" > < a href = "#cb7-10" > < / a > pango_font_desc < span class = "op" > =< / span > pango_font_description_from_string < span class = "op" > (< / span > font< span class = "op" > );< / span > < / span >
< span id = "cb7-11" > < a href = "#cb7-11" > < / a > g_free < span class = "op" > (< / span > font< span class = "op" > );< / span > < / span >
< span id = "cb7-12" > < a href = "#cb7-12" > < / a > s < span class = "op" > =< / span > pfd2css < span class = "op" > (< / span > pango_font_desc< span class = "op" > );< / span > < span class = "co" > // converts Pango Font Description into CSS style string< / span > < / span >
< span id = "cb7-13" > < a href = "#cb7-13" > < / a > pango_font_description_free < span class = "op" > (< / span > pango_font_desc< span class = "op" > );< / span > < / span >
< span id = "cb7-14" > < a href = "#cb7-14" > < / a > css < span class = "op" > =< / span > g_strdup_printf < span class = "op" > (< / span > < span class = "st" > " textview {%s}" < / span > < span class = "op" > ,< / span > s< span class = "op" > );< / span > < / span >
< span id = "cb7-15" > < a href = "#cb7-15" > < / a > gtk_css_provider_load_from_data < span class = "op" > (< / span > app< span class = "op" > -> < / span > provider< span class = "op" > ,< / span > css< span class = "op" > ,< / span > < span class = "op" > -< / span > < span class = "dv" > 1< / span > < span class = "op" > );< / span > < / span >
< span id = "cb7-16" > < a href = "#cb7-16" > < / a > g_free < span class = "op" > (< / span > s< span class = "op" > );< / span > < / span >
< span id = "cb7-17" > < a href = "#cb7-17" > < / a > g_free < span class = "op" > (< / span > css< span class = "op" > );< / span > < / span >
< span id = "cb7-18" > < a href = "#cb7-18" > < / a > < span class = "op" > }< / span > < / span > < / code > < / pre > < / div >
< p > The function < code > changed_font_cb< / code > is a handler for
“changed::font-desc” signal on the GSettings instance. The signal name
is “changed” and “font-desc” is a key name. This signal is emitted when
the value of the “font-desc” key is changed. The value is bound to the
“font-desc” property of the GtkFontDialogButton instance. Therefore, the
handler < code > changed_font_cb< / code > is called when the user selects and
updates a font through the font dialog.< / p >
< p > A string is retrieved from the GSetting database and converts it into
a pango font description. And a CSS string is made by the function
< code > pfd2css< / code > and < code > g_strdup_printf< / code > . Then the css
provider is set to the string. The provider has been inserted to the
current display in advance. So, the font is applied to the display.< / p >
< h2 id = "other-files" > Other files< / h2 >
< p > main.c< / p >
< div class = "sourceCode" id = "cb8" > < pre
class="sourceCode numberSource C numberLines">< code class = "sourceCode c" > < span id = "cb8-1" > < a href = "#cb8-1" > < / a > < span class = "pp" > #include < / span > < span class = "im" > < gtk/gtk.h> < / span > < / span >
< span id = "cb8-2" > < a href = "#cb8-2" > < / a > < span class = "pp" > #include < / span > < span class = "im" > " tfeapplication.h" < / span > < / span >
< span id = "cb8-3" > < a href = "#cb8-3" > < / a > < / span >
< span id = "cb8-4" > < a href = "#cb8-4" > < / a > < span class = "pp" > #define APPLICATION_ID " com.github.ToshioCP.tfe" < / span > < / span >
< span id = "cb8-5" > < a href = "#cb8-5" > < / a > < / span >
< span id = "cb8-6" > < a href = "#cb8-6" > < / a > < span class = "dt" > int< / span > < / span >
< span id = "cb8-7" > < a href = "#cb8-7" > < / a > main < span class = "op" > (< / span > < span class = "dt" > int< / span > argc< span class = "op" > ,< / span > < span class = "dt" > char< / span > < span class = "op" > **< / span > argv< span class = "op" > )< / span > < span class = "op" > {< / span > < / span >
< span id = "cb8-8" > < a href = "#cb8-8" > < / a > TfeApplication < span class = "op" > *< / span > app< span class = "op" > ;< / span > < / span >
< span id = "cb8-9" > < a href = "#cb8-9" > < / a > < span class = "dt" > int< / span > stat< span class = "op" > ;< / span > < / span >
< span id = "cb8-10" > < a href = "#cb8-10" > < / a > < / span >
< span id = "cb8-11" > < a href = "#cb8-11" > < / a > app < span class = "op" > =< / span > tfe_application_new < span class = "op" > (< / span > APPLICATION_ID< span class = "op" > ,< / span > G_APPLICATION_HANDLES_OPEN< span class = "op" > );< / span > < / span >
< span id = "cb8-12" > < a href = "#cb8-12" > < / a > stat < span class = "op" > =< / span > g_application_run < span class = "op" > (< / span > G_APPLICATION < span class = "op" > (< / span > app< span class = "op" > ),< / span > argc< span class = "op" > ,< / span > argv< span class = "op" > );< / span > < / span >
< span id = "cb8-13" > < a href = "#cb8-13" > < / a > g_object_unref < span class = "op" > (< / span > app< span class = "op" > );< / span > < / span >
< span id = "cb8-14" > < a href = "#cb8-14" > < / a > < span class = "cf" > return< / span > stat< span class = "op" > ;< / span > < / span >
< span id = "cb8-15" > < a href = "#cb8-15" > < / a > < span class = "op" > }< / span > < / span > < / code > < / pre > < / div >
< p > Resource XML file.< / p >
< div class = "sourceCode" id = "cb9" > < pre
class="sourceCode numberSource xml numberLines">< code class = "sourceCode xml" > < span id = "cb9-1" > < a href = "#cb9-1" > < / a > < span class = "fu" > < ?xml< / span > < span class = "ot" > version=< / span > < span class = "st" > " 1.0" < / span > < span class = "ot" > encoding=< / span > < span class = "st" > " UTF-8" < / span > < span class = "fu" > ?> < / span > < / span >
< span id = "cb9-2" > < a href = "#cb9-2" > < / a > < < span class = "kw" > gresources< / span > > < / span >
< span id = "cb9-3" > < a href = "#cb9-3" > < / a > < < span class = "kw" > gresource< / span > < span class = "ot" > prefix=< / span > < span class = "st" > " /com/github/ToshioCP/tfe" < / span > > < / span >
< span id = "cb9-4" > < a href = "#cb9-4" > < / a > < < span class = "kw" > file< / span > > tfewindow.ui< /< span class = "kw" > file< / span > > < / span >
< span id = "cb9-5" > < a href = "#cb9-5" > < / a > < < span class = "kw" > file< / span > > tfepref.ui< /< span class = "kw" > file< / span > > < / span >
< span id = "cb9-6" > < a href = "#cb9-6" > < / a > < < span class = "kw" > file< / span > > tfealert.ui< /< span class = "kw" > file< / span > > < / span >
< span id = "cb9-7" > < a href = "#cb9-7" > < / a > < < span class = "kw" > file< / span > > menu.ui< /< span class = "kw" > file< / span > > < / span >
< span id = "cb9-8" > < a href = "#cb9-8" > < / a > < /< span class = "kw" > gresource< / span > > < / span >
< span id = "cb9-9" > < a href = "#cb9-9" > < / a > < /< span class = "kw" > gresources< / span > > < / span > < / code > < / pre > < / div >
< p > GSchema XML file< / p >
< div class = "sourceCode" id = "cb10" > < pre
class="sourceCode numberSource xml numberLines">< code class = "sourceCode xml" > < span id = "cb10-1" > < a href = "#cb10-1" > < / a > < span class = "fu" > < ?xml< / span > < span class = "ot" > version=< / span > < span class = "st" > " 1.0" < / span > < span class = "ot" > encoding=< / span > < span class = "st" > " UTF-8" < / span > < span class = "fu" > ?> < / span > < / span >
< span id = "cb10-2" > < a href = "#cb10-2" > < / a > < < span class = "kw" > schemalist< / span > > < / span >
< span id = "cb10-3" > < a href = "#cb10-3" > < / a > < < span class = "kw" > schema< / span > < span class = "ot" > path=< / span > < span class = "st" > " /com/github/ToshioCP/tfe/" < / span > < span class = "ot" > id=< / span > < span class = "st" > " com.github.ToshioCP.tfe" < / span > > < / span >
< span id = "cb10-4" > < a href = "#cb10-4" > < / a > < < span class = "kw" > key< / span > < span class = "ot" > name=< / span > < span class = "st" > " font-desc" < / span > < span class = "ot" > type=< / span > < span class = "st" > " s" < / span > > < / span >
< span id = "cb10-5" > < a href = "#cb10-5" > < / a > < < span class = "kw" > default< / span > > ' Monospace 12' < /< span class = "kw" > default< / span > > < / span >
< span id = "cb10-6" > < a href = "#cb10-6" > < / a > < < span class = "kw" > summary< / span > > Font< /< span class = "kw" > summary< / span > > < / span >
< span id = "cb10-7" > < a href = "#cb10-7" > < / a > < < span class = "kw" > description< / span > > A font to be used for textview.< /< span class = "kw" > description< / span > > < / span >
< span id = "cb10-8" > < a href = "#cb10-8" > < / a > < /< span class = "kw" > key< / span > > < / span >
< span id = "cb10-9" > < a href = "#cb10-9" > < / a > < /< span class = "kw" > schema< / span > > < / span >
< span id = "cb10-10" > < a href = "#cb10-10" > < / a > < /< span class = "kw" > schemalist< / span > > < / span > < / code > < / pre > < / div >
< p > Meson.build< / p >
< div class = "sourceCode" id = "cb11" > < pre
2024-01-13 22:59:14 +01:00
class="sourceCode numberSource numberLines">< code class = "sourceCode" > < span id = "cb11-1" > < a href = "#cb11-1" > < / a > project(' tfe' , ' c' , license : ' GPL-3.0-or-later' , meson_version:' > =1.0.1' , version: ' 0.5' )< / span >
2023-07-15 10:27:53 +02:00
< span id = "cb11-2" > < a href = "#cb11-2" > < / a > < / span >
< span id = "cb11-3" > < a href = "#cb11-3" > < / a > gtkdep = dependency(' gtk4' )< / span >
< span id = "cb11-4" > < a href = "#cb11-4" > < / a > < / span >
< span id = "cb11-5" > < a href = "#cb11-5" > < / a > gnome = import(' gnome' )< / span >
< span id = "cb11-6" > < a href = "#cb11-6" > < / a > resources = gnome.compile_resources(' resources' ,' tfe.gresource.xml' )< / span >
< span id = "cb11-7" > < a href = "#cb11-7" > < / a > gnome.compile_schemas(depend_files: ' com.github.ToshioCP.tfe.gschema.xml' )< / span >
< span id = "cb11-8" > < a href = "#cb11-8" > < / a > < / span >
< span id = "cb11-9" > < a href = "#cb11-9" > < / a > sourcefiles = files(' main.c' , ' tfeapplication.c' , ' tfewindow.c' , ' tfepref.c' , ' tfealert.c' , ' pfd2css.c' , ' ../tfetextview/tfetextview.c' )< / span >
< span id = "cb11-10" > < a href = "#cb11-10" > < / a > < / span >
< span id = "cb11-11" > < a href = "#cb11-11" > < / a > executable(meson.project_name(), sourcefiles, resources, dependencies: gtkdep, export_dynamic: true, install: true)< / span >
< span id = "cb11-12" > < a href = "#cb11-12" > < / a > < / span >
< span id = "cb11-13" > < a href = "#cb11-13" > < / a > schema_dir = get_option(' prefix' ) / get_option(' datadir' ) / ' glib-2.0/schemas/' < / span >
< span id = "cb11-14" > < a href = "#cb11-14" > < / a > install_data(' com.github.ToshioCP.tfe.gschema.xml' , install_dir: schema_dir)< / span >
< span id = "cb11-15" > < a href = "#cb11-15" > < / a > gnome.post_install (glib_compile_schemas: true)< / span > < / code > < / pre > < / div >
< ul >
< li > The function < code > project< / code > defines project and initialize
meson. The first argument is the project name and the second is the
language name. The other arguments are keyword arguments.< / li >
< li > The function < code > dependency< / code > defines the denpendent library.
Tfe depends GTK4. This is used to create < code > pkg-config< / code > option
in the command line of C compiler to include header files and link
libraries. The returned object < code > gtkdep< / code > is used as an
argument to the < code > executable< / code > function later.< / li >
< li > The function < code > import< / code > imports an extension module. The
GNOME module has some convenient methods like
< code > gnome.compile_resources< / code > and
< code > gnome.compile_schemas< / code > .< / li >
< li > The method < code > gnome.compile_resources< / code > compiles and creates
resource files. The first argument is the resource name without
extension and the second is the name of XML file. The returned value is
an array < code > ['resources,c', 'resources.h']< / code > .< / li >
< li > The function < code > gnome.compile_schemas< / code > compiles the schema
files in the current directory. This just creates
< code > gschemas.compiled< / code > in the build directory. It is used to
test the executable binary in the build directory. The function doesn’
install the schema file.< / li >
< li > The function < code > files< / code > creates a File Object.< / li >
< li > The function < code > executable< / code > defines the compilation
elements such as target name, source files, dependencies and
installation. The target name is “tfe”. The source files are elements of
‘ ’ ’
installed.< / li >
< li > The last three lines are post install work. The variable
< code > schema_dir< / code > is the directory stored the schema file. If
meson runs with < code > --prefix=$HOME/.local< / code > argument, it is
< code > $HOME/.local/share/glib-2.9/schemas< / code > . The function
< code > install_data< / code > copies the first argument file into the second
argument directory. The method < code > gnome.post_install< / code > runs
< code > glib-compile-schemas< / code > and updates
< code > gschemas_compiled< / code > file.< / li >
< / ul >
< h2 id = "compilation-and-installation." > Compilation and
installation.< / h2 >
< p > If you want to install it to your local area, use
< code > --prefix=$HOME/.local< / code > or < code > --prefix=$HOME< / code >
option. If you want to install it to the system area, no option is
needed. It will be installed under < code > /user/local< / code >
directory.< / p >
< pre > < code > $ meson setup --prefix=$HOME/.local _build
$ ninja -C _build
$ ninja -C _build install< / code > < / pre >
< p > You need root privilege to install it to the system area..< / p >
< pre > < code > $ meson setup _build
$ ninja -C _build
$ sudo ninja -C _build install< / code > < / pre >
< p > Source files are in src/tfe6 directory.< / p >
< p > We made a very small text editor. You can add features to this
editor. When you add a new feature, be careful about the structure of
the program. Maybe you need to divide a file into several files. It
isn’
think about the relationship between source files and widget
structures.< / p >
< p > The source files are in the < a
href="https://github.com/ToshioCP/Gtk4-tutorial">Gtk4 tutorial GitHub
repository< / a > . Download it and see < code > src/tfe6< / code > directory.< / p >
< p > Note: When the menu button is clicked, error messages are
printed.< / p >
< pre > < code > (tfe:31153): Gtk-CRITICAL **: 13:05:40.746: _gtk_css_corner_value_get_x: assertion ' corner-> class == & GTK_CSS_VALUE_CORNER' failed< / code > < / pre >
< p > I found a < a
href="https://discourse.gnome.org/t/menu-button-gives-error-messages-with-latest-gtk4/15689">message< / a >
in the GNOME Discourse. The comment says that GTK 4.10 has a bug and it
is fixed in the version 4.10.5. I haven’
UBUNTU GTK4 is still 4.10.4.< / p >
2023-12-10 09:39:32 +01:00
< / div >
< / div >
2022-04-21 16:53:28 +02:00
< / div >
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