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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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17
Libraries/LibGUI/GWidget.h
View file

@ -9,6 +9,7 @@
#include <LibDraw/Font.h>
#include <LibDraw/Orientation.h>
#include <LibDraw/Rect.h>
#include <LibDraw/SystemTheme.h>
#include <LibGUI/GEvent.h>
#include <LibGUI/GShortcut.h>
@ -16,11 +17,12 @@
extern GWidgetClassRegistration registration_##class_name; \
GWidgetClassRegistration registration_##class_name(#class_name, [](GWidget* parent) { return class_name::construct(parent); });
class GraphicsBitmap;
class GAction;
class GLayout;
class GMenu;
class GWindow;
class GraphicsBitmap;
class Palette;
enum class SizePolicy {
Fixed,
@ -149,6 +151,12 @@ public:
void move_by(int x, int y) { move_by({ x, y }); }
void move_by(const Point& delta) { set_relative_rect({ relative_position().translated(delta), size() }); }
ColorRole background_role() const { return m_background_role; }
void set_background_role(ColorRole role) { m_background_role = role; }
ColorRole foreground_role() const { return m_foreground_role; }
void set_foreground_role(ColorRole role) { m_foreground_role = role; }
Color background_color() const { return m_background_color; }
Color foreground_color() const { return m_foreground_color; }
@ -230,6 +238,9 @@ public:
void do_layout();
const Palette& palette() const { return *m_palette; }
void set_palette(const Palette&);
protected:
explicit GWidget(GWidget* parent = nullptr);
@ -271,6 +282,8 @@ private:
OwnPtr<GLayout> m_layout;
Rect m_relative_rect;
ColorRole m_background_role { ColorRole::Window };
ColorRole m_foreground_role { ColorRole::WindowText };
Color m_background_color;
Color m_foreground_color;
NonnullRefPtr<Font> m_font;
@ -288,6 +301,8 @@ private:
bool m_updates_enabled { true };
HashMap<GShortcut, GAction*> m_local_shortcut_actions;
NonnullRefPtr<Palette> m_palette;
};
template<>