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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
Libraries/LibGUI/GSplitter.cpp
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@ -1,3 +1,4 @@
#include <LibDraw/Palette.h>
#include <LibGUI/GBoxLayout.h>
#include <LibGUI/GSplitter.h>
#include <LibGUI/GWindow.h>
@ -6,9 +7,9 @@ GSplitter::GSplitter(Orientation orientation, GWidget* parent)
: GFrame(parent)
, m_orientation(orientation)
{
set_background_role(ColorRole::Button);
set_layout(make<GBoxLayout>(orientation));
set_fill_with_background_color(true);
set_background_color(SystemColor::Window);
layout()->set_spacing(3);
}
@ -18,14 +19,14 @@ GSplitter::~GSplitter()
void GSplitter::enter_event(CEvent&)
{
set_background_color(StylePainter::hover_highlight_color());
set_background_role(ColorRole::HoverHighlight);
window()->set_override_cursor(m_orientation == Orientation::Horizontal ? GStandardCursor::ResizeHorizontal : GStandardCursor::ResizeVertical);
update();
}
void GSplitter::leave_event(CEvent&)
{
set_background_color(SystemColor::Window);
set_background_role(ColorRole::Button);
if (!m_resizing)
window()->set_override_cursor(GStandardCursor::None);
update();