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LibGUI+LibDraw: Add "Palette" concept for scoped color theming

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GApplication now has a palette. This palette contains all the system
theme colors by default, and is inherited by a new top-level GWidget.
New child widgets inherit their parents palette.

It is possible to override the GApplication palette, and the palette
of any GWidget.

The Palette object contains a bunch of colors, each corresponding to
a ColorRole. Each role has a convenience getter as well.

Each GWidget now has a background_role() and foreground_role(), which
are then looked up in their current palette when painting. This means
that you no longer alter the background color of a widget by setting
it directly, rather you alter either its background role, or the
widget's palette.
This commit is contained in:
Andreas Kling 2019-12-24 20:57:54 +01:00
parent cb4e51a7a5
commit a79bac428b
62 changed files with 448 additions and 410 deletions
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6
Libraries/LibGUI/GResizeCorner.cpp
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@ -1,11 +1,13 @@
#include <LibDraw/GraphicsBitmap.h>
#include <LibDraw/Palette.h>
#include <LibGUI/GPainter.h>
#include <LibGUI/GResizeCorner.h>
#include <LibGUI/GWindow.h>
#include <LibDraw/GraphicsBitmap.h>
GResizeCorner::GResizeCorner(GWidget* parent)
: GWidget(parent)
{
set_background_role(ColorRole::Button);
set_size_policy(SizePolicy::Fixed, SizePolicy::Fixed);
set_preferred_size(16, 16);
m_bitmap = GraphicsBitmap::load_from_file("/res/icons/resize-corner.png");
@ -20,7 +22,7 @@ void GResizeCorner::paint_event(GPaintEvent& event)
{
GPainter painter(*this);
painter.add_clip_rect(event.rect());
painter.fill_rect(rect(), SystemColor::Button);
painter.fill_rect(rect(), palette().color(background_role()));
painter.blit({ 0, 0 }, *m_bitmap, m_bitmap->rect());
GWidget::paint_event(event);
}