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scroll-view-fade: Adjust the effect to work in RTL locales

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The vertical scrollbar is located on the left in RTL locales, so
pass an additional parameter to the shader which indicates the
locale's text direction.

https://bugzilla.gnome.org/show_bug.cgi?id=643156
This commit is contained in:
Florian Müllner 2011-02-24 02:16:07 +01:00
parent d15122c4b2
commit 63be52e191
1 changed files with 9 additions and 2 deletions
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11
src/st/st-scroll-view-fade.c
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@ -42,6 +42,7 @@ static const gchar *fade_glsl_shader =
"uniform float scrollbar_width;\n"
"uniform float offset_bottom;\n"
"uniform float offset_top;\n"
"uniform bool rtl;\n"
"\n"
"void main ()\n"
"{\n"
@ -51,11 +52,11 @@ static const gchar *fade_glsl_shader =
" float ratio = 0.0;\n"
" float fade_bottom_start = height - offset_bottom;\n"
" \n"
" if (offset_top != 0.0 && y < offset_top && x < (width - scrollbar_width)) {\n"
" if (offset_top != 0.0 && y < offset_top && ((rtl && x > scrollbar_width) || (!rtl && x < (width - scrollbar_width)))) {\n"
" ratio = y / offset_top;\n"
" cogl_color_out = color * ratio;\n"
" }\n"
" else if (offset_bottom != 0.0 && y > fade_bottom_start && x < (width - scrollbar_width)) {\n"
" else if (offset_bottom != 0.0 && y > fade_bottom_start && ((rtl && x > scrollbar_width) || (!rtl && x < (width - scrollbar_width)))) {\n"
" ratio = (height - y)/(height - fade_bottom_start);\n"
" cogl_color_out = color * ratio;\n"
" }\n"
@ -80,6 +81,7 @@ struct _StScrollViewFade
gint scrollbar_width_uniform;
gint offset_top_uniform;
gint offset_bottom_uniform;
gint rtl_uniform;
StAdjustment *vadjustment;
@ -141,6 +143,8 @@ st_scroll_view_fade_pre_paint (ClutterEffect *effect)
cogl_program_get_uniform_location (self->program, "width");
self->scrollbar_width_uniform =
cogl_program_get_uniform_location (self->program, "scrollbar_width");
self->rtl_uniform =
cogl_program_get_uniform_location (self->program, "rtl");
self->offset_top_uniform =
cogl_program_get_uniform_location (self->program, "offset_top");
self->offset_bottom_uniform =
@ -199,6 +203,8 @@ st_scroll_view_fade_paint_target (ClutterOffscreenEffect *effect)
cogl_program_set_uniform_1f (self->program, self->width_uniform, clutter_actor_get_width (self->actor));
if (self->scrollbar_width_uniform > -1)
cogl_program_set_uniform_1f (self->program, self->scrollbar_width_uniform, clutter_actor_get_width (vscroll));
if (self->rtl_uniform > -1)
cogl_program_set_uniform_1i (self->program, self->rtl_uniform, (st_widget_get_direction (ST_WIDGET (self->actor)) == ST_TEXT_DIRECTION_RTL));
material = clutter_offscreen_effect_get_target (effect);
cogl_material_set_user_program (material, self->program);
@ -408,6 +414,7 @@ st_scroll_view_fade_init (StScrollViewFade *self)
self->height_uniform = -1;
self->width_uniform = -1;
self->scrollbar_width_uniform = -1;
self->rtl_uniform = -1;
self->offset_top_uniform = -1;
self->offset_bottom_uniform = -1;
self->fade_offset = DEFAULT_FADE_OFFSET;