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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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26
Libraries/LibDraw/Palette.cpp Normal file
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#include <LibDraw/Palette.h>
NonnullRefPtr<Palette> Palette::create_with_shared_buffer(SharedBuffer& buffer)
{
return adopt(*new Palette(buffer));
}
Palette::Palette(SharedBuffer& buffer)
: m_theme_buffer(buffer)
{
}
Palette::~Palette()
{
}
const SystemTheme& Palette::theme() const
{
return *(const SystemTheme*)m_theme_buffer->data();
}
Color Palette::color(ColorRole role) const
{
ASSERT((int)role < (int)ColorRole::__Count);
return theme().color[(int)role];
}