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textview: Add line height plumbing

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This adds a line-height property to GtkTexttag and a
line_height field to GtkTextAttributes, and translates
it to a pango attribute.
This commit is contained in:
Matthias Clasen 2021-08-05 22:22:50 -04:00
parent bbd2b255a3
commit 66b297e408
5 changed files with 55 additions and 2 deletions
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4
gtk/gtktextattributes.c
View File

@ -387,6 +387,9 @@ _gtk_text_attributes_fill_from_tags (GtkTextAttributes *dest,
if (tag->priv->pixels_inside_wrap_set)
dest->pixels_inside_wrap = vals->pixels_inside_wrap;
if (tag->priv->line_height_set)
dest->line_height = vals->line_height;
if (tag->priv->tabs_set)
{
if (dest->tabs)
@ -457,6 +460,7 @@ _gtk_text_tag_affects_size (GtkTextTag *tag)
priv->pixels_above_lines_set ||
priv->pixels_below_lines_set ||
priv->pixels_inside_wrap_set ||
priv->line_height_set ||
priv->tabs_set ||
priv->underline_set ||
priv->overline_set ||

2
gtk/gtktextattributes.h
View File

@ -147,6 +147,8 @@ struct _GtkTextAttributes
int pixels_below_lines;
int pixels_inside_wrap;
float line_height;
int letter_spacing;
guint invisible : 1;

12
gtk/gtktextlayout.c
View File

@ -1638,6 +1638,17 @@ add_text_attrs (GtkTextLayout *layout,
pango_attr_list_insert (attrs, attr);
}
#if PANGO_VERSION_CHECK(1, 49, 0)
if (style->line_height != 0.0)
{
attr = pango_attr_line_height_new (style->line_height);
attr->start_index = start;
attr->end_index = start + byte_count;
pango_attr_list_insert (attrs, attr);
}
#endif
if (style->font_features)
{
attr = pango_attr_font_features_new (style->font_features);
@ -1673,7 +1684,6 @@ add_text_attrs (GtkTextLayout *layout,
pango_attr_list_insert (attrs, attr);
}
}
static void

36
gtk/gtktexttag.c
View File

@ -107,6 +107,7 @@ enum {
PROP_PIXELS_ABOVE_LINES,
PROP_PIXELS_BELOW_LINES,
PROP_PIXELS_INSIDE_WRAP,
PROP_LINE_HEIGHT,
PROP_EDITABLE,
PROP_WRAP_MODE,
PROP_JUSTIFICATION,
@ -150,6 +151,7 @@ enum {
PROP_PIXELS_ABOVE_LINES_SET,
PROP_PIXELS_BELOW_LINES_SET,
PROP_PIXELS_INSIDE_WRAP_SET,
PROP_LINE_HEIGHT_SET,
PROP_EDITABLE_SET,
PROP_WRAP_MODE_SET,
PROP_JUSTIFICATION_SET,
@ -596,6 +598,21 @@ gtk_text_tag_class_init (GtkTextTagClass *klass)
0,
GTK_PARAM_READWRITE));
/**
* GtkTexTag:line-height:
*
* Factor to scale line height by.
*
* Since: 4.6
*/
g_object_class_install_property (object_class,
PROP_LINE_HEIGHT,
g_param_spec_float ("line-height",
P_("Line height factor"),
P_("The factor to apply to line height"),
0.0, 10.0, 0.0,
GTK_PARAM_READWRITE));
/**
* GtkTextTag:strikethrough:
*
@ -936,6 +953,10 @@ gtk_text_tag_class_init (GtkTextTagClass *klass)
P_("Pixels inside wrap set"),
P_("Whether this tag affects the number of pixels between wrapped lines"));
ADD_SET_PROP ("line-height-set", PROP_LINE_HEIGHT_SET,
P_("Line height set"),
P_("Whether this tag affects the height of lines"));
ADD_SET_PROP ("strikethrough-set", PROP_STRIKETHROUGH_SET,
P_("Strikethrough set"),
P_("Whether this tag affects strikethrough"));
@ -1573,6 +1594,13 @@ gtk_text_tag_set_property (GObject *object,
size_changed = TRUE;
break;
case PROP_LINE_HEIGHT:
priv->line_height_set = TRUE;
priv->values->line_height = g_value_get_float (value);
g_object_notify (object, "line-height-set");
size_changed = TRUE;
break;
case PROP_EDITABLE:
priv->editable_set = TRUE;
priv->values->editable = g_value_get_boolean (value);
@ -2022,6 +2050,10 @@ gtk_text_tag_get_property (GObject *object,
g_value_set_int (value, priv->values->pixels_inside_wrap);
break;
case PROP_LINE_HEIGHT:
g_value_set_float (value, priv->values->line_height);
break;
case PROP_EDITABLE:
g_value_set_boolean (value, priv->values->editable);
break;
@ -2169,6 +2201,10 @@ gtk_text_tag_get_property (GObject *object,
g_value_set_boolean (value, priv->pixels_inside_wrap_set);
break;
case PROP_LINE_HEIGHT_SET:
g_value_set_boolean (value, priv->line_height_set);
break;
case PROP_EDITABLE_SET:
g_value_set_boolean (value, priv->editable_set);
break;

1
gtk/gtktexttagprivate.h
View File

@ -71,6 +71,7 @@ struct _GtkTextTagPrivate
guint pixels_above_lines_set : 1;
guint pixels_below_lines_set : 1;
guint pixels_inside_wrap_set : 1;
guint line_height_set : 1;
guint tabs_set : 1;
guint underline_set : 1;
guint overline_set : 1;