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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
Applications/Welcome/TextWidget.cpp
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@ -1,10 +1,10 @@
#include "TextWidget.h"
#include <AK/String.h>
#include <AK/StringBuilder.h>
#include <AK/Vector.h>
#include <LibDraw/Palette.h>
#include <LibGUI/GPainter.h>
#include "TextWidget.h"
TextWidget::TextWidget(GWidget* parent)
: GFrame(parent)
{
@ -49,7 +49,7 @@ void TextWidget::paint_event(GPaintEvent& event)
text_rect.set_width(text_rect.width() - indent * 2);
if (is_enabled()) {
painter.draw_text(text_rect, line, m_text_alignment, foreground_color(), TextElision::None);
painter.draw_text(text_rect, line, m_text_alignment, palette().color(foreground_role()), TextElision::None);
} else {
painter.draw_text(text_rect.translated(1, 1), line, font(), text_alignment(), Color::White, TextElision::Right);
painter.draw_text(text_rect, line, font(), text_alignment(), Color::from_rgb(0x808080), TextElision::Right);