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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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7
Applications/SystemMonitor/main.cpp
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@ -53,7 +53,6 @@ int main(int argc, char** argv)
auto keeper = GWidget::construct();
keeper->set_layout(make<GBoxLayout>(Orientation::Vertical));
keeper->set_fill_with_background_color(true);
keeper->set_background_color(SystemColor::Window);
keeper->layout()->set_margins({ 4, 4, 4, 4 });
auto tabwidget = GTabWidget::construct(keeper);
@ -192,7 +191,7 @@ class ProgressBarPaintingDelegate final : public GTableCellPaintingDelegate {
public:
virtual ~ProgressBarPaintingDelegate() override {}
virtual void paint(GPainter& painter, const Rect& a_rect, const GModel& model, const GModelIndex& index) override
virtual void paint(GPainter& painter, const Rect& a_rect, const Palette& palette, const GModel& model, const GModelIndex& index) override
{
auto rect = a_rect.shrunken(2, 2);
auto percentage = model.data(index, GModel::Role::Custom).to_int();
@ -201,7 +200,7 @@ public:
String text;
if (data.is_string())
text = data.as_string();
StylePainter::paint_progress_bar(painter, rect, 0, 100, percentage, text);
StylePainter::paint_progress_bar(painter, rect, palette, 0, 100, percentage, text);
painter.draw_rect(rect, Color::Black);
}
};
@ -355,7 +354,7 @@ NonnullRefPtr<GWidget> build_graphs_tab()
graphs_container->on_first_show = [](auto& self) {
self.set_fill_with_background_color(true);
self.set_background_color(SystemColor::Window);
self.set_background_role(ColorRole::Button);
self.set_layout(make<GBoxLayout>(Orientation::Vertical));
self.layout()->set_margins({ 4, 4, 4, 4 });