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LibGUI: Add center_window_group_within() to AbstractThemePreview

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This method will center a group of window rects, within some
bounds, accounting for the properties of the currently selected theme
(i.e. border width, title height, etc).
This commit is contained in:
MacDue 2022-05-01 15:45:14 +01:00 committed by Linus Groh
parent 28241f25dc
commit 21c647dd75
2 changed files with 32 additions and 0 deletions
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27
Userland/Libraries/LibGUI/AbstractThemePreview.cpp
View file

@ -158,4 +158,31 @@ void AbstractThemePreview::paint_event(GUI::PaintEvent& event)
paint_preview(event);
}
void AbstractThemePreview::center_window_group_within(Span<Window> windows, Gfx::IntRect const& bounds)
{
VERIFY(windows.size() >= 1);
auto to_frame_rect = [&](Gfx::IntRect const& rect) {
return Gfx::WindowTheme::current().frame_rect_for_window(
Gfx::WindowTheme::WindowType::Normal, rect, m_preview_palette, 0);
};
auto leftmost_x_value = windows[0].rect.x();
auto topmost_y_value = windows[0].rect.y();
auto combind_frame_rect = to_frame_rect(windows[0].rect);
for (auto& window : windows.slice(1)) {
if (window.rect.x() < leftmost_x_value)
leftmost_x_value = window.rect.x();
if (window.rect.y() < topmost_y_value)
topmost_y_value = window.rect.y();
combind_frame_rect = combind_frame_rect.united(to_frame_rect(window.rect));
}
combind_frame_rect.center_within(bounds);
auto frame_offset = to_frame_rect({}).location();
for (auto& window : windows) {
window.rect.set_left(combind_frame_rect.left() + (window.rect.x() - leftmost_x_value) - frame_offset.x());
window.rect.set_top(combind_frame_rect.top() + (window.rect.y() - topmost_y_value) - frame_offset.y());
}
}
}

5
Userland/Libraries/LibGUI/AbstractThemePreview.h
View file

@ -31,6 +31,11 @@ public:
Function<void(String const&)> on_theme_load_from_file;
Function<void()> on_palette_change;
struct Window {
Gfx::IntRect& rect;
};
void center_window_group_within(Span<Window> windows, Gfx::IntRect const& bounds);
protected:
explicit AbstractThemePreview(Gfx::Palette const&);