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egui_glium: add support for transparent windows

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Also support non-decorated windows (without border)
This commit is contained in:
Emil Ernerfeldt
2021-03-31 20:53:13 +02:00
parent 0a21b01c31
commit 3450168e94
6 changed files with 46 additions and 39 deletions
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17
egui_demo_lib/src/apps/demo/demo_windows.rs
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@@ -129,12 +129,17 @@ impl DemoWindows {
show_menu_bar(ui);
});
// Just get a background to put the windows on instead of using whatever the clear color is
let frame = egui::Frame {
fill: ctx.style().visuals.extreme_bg_color,
..egui::Frame::none()
};
egui::CentralPanel::default().frame(frame).show(ctx, |_| {});
{
let mut fill = ctx.style().visuals.extreme_bg_color;
if !cfg!(target_arch = "wasm32") {
// Native: WrapApp uses a transparent window, so let's show that off:
// NOTE: the OS compositor assumes "normal" blending, so we need to hack it:
let [r, g, b, _] = fill.to_array();
fill = egui::Color32::from_rgba_premultiplied(r, g, b, 180);
}
let frame = egui::Frame::none().fill(fill);
egui::CentralPanel::default().frame(frame).show(ctx, |_| {});
}
self.windows(ctx);
}

8
egui_demo_lib/src/wrap_app.rs
View File

@@ -54,6 +54,14 @@ impl epi::App for WrapApp {
self.backend_panel.max_size_points_active
}
// Let's show off that we support transparent windows (on native):
fn transparent(&self) -> bool {
true
}
fn clear_color(&self) -> egui::Rgba {
egui::Rgba::TRANSPARENT // we set a `CentralPanel` fill color in `demo_windows.rs`
}
fn warm_up_enabled(&self) -> bool {
// The example windows use a lot of emojis. Pre-cache them by running one frame where everything is open
#[cfg(debug_assertions)]