137 lines
4.2 KiB
Rust
137 lines
4.2 KiB
Rust
// Renders image behind widget, and otherwise passes through all behavior
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use cosmic::{
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iced::{
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advanced::{
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layout::{self},
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mouse, overlay, renderer,
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widget::{tree, Operation, OperationOutputWrapper, Tree},
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Clipboard, Layout, Shell, Widget,
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},
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event::{self, Event},
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widget::image::{FilterMethod, Handle},
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ContentFit, Length, Rectangle, Size, Vector,
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},
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iced_core::Renderer,
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};
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use std::marker::PhantomData;
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pub fn image_bg<'a, Msg, T: Into<cosmic::Element<'a, Msg>>>(content: T) -> ImageBg<'a, Msg> {
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ImageBg {
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content: content.into(),
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_msg: PhantomData,
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}
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}
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pub struct ImageBg<'a, Msg> {
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content: cosmic::Element<'a, Msg>,
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_msg: PhantomData<Msg>,
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}
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impl<'a, Msg> Widget<Msg, cosmic::Theme, cosmic::Renderer> for ImageBg<'a, Msg> {
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delegate::delegate! {
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to self.content.as_widget() {
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fn tag(&self) -> tree::Tag;
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fn state(&self) -> tree::State;
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fn children(&self) -> Vec<Tree>;
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fn size(&self) -> Size<Length>;
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fn size_hint(&self) -> Size<Length>;
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fn layout(
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&self,
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tree: &mut Tree,
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renderer: &cosmic::Renderer,
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limits: &layout::Limits,
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) -> layout::Node;
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fn operate(
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&self,
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tree: &mut Tree,
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layout: Layout<'_>,
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renderer: &cosmic::Renderer,
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operation: &mut dyn Operation<OperationOutputWrapper<Msg>>,
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);
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fn mouse_interaction(
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&self,
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tree: &Tree,
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layout: Layout<'_>,
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cursor: mouse::Cursor,
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viewport: &Rectangle,
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renderer: &cosmic::Renderer,
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) -> mouse::Interaction;
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}
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to self.content.as_widget_mut() {
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fn diff(&mut self, tree: &mut Tree);
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fn on_event(
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&mut self,
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tree: &mut Tree,
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event: Event,
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layout: Layout<'_>,
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cursor: mouse::Cursor,
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renderer: &cosmic::Renderer,
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clipboard: &mut dyn Clipboard,
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shell: &mut Shell<'_, Msg>,
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viewport: &Rectangle,
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) -> event::Status;
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fn overlay<'b>(
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&'b mut self,
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tree: &'b mut Tree,
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layout: Layout<'_>,
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renderer: &cosmic::Renderer,
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) -> Option<overlay::Element<'b, Msg, cosmic::Theme, cosmic::Renderer>>;
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}
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}
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fn draw(
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&self,
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state: &Tree,
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renderer: &mut cosmic::Renderer,
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theme: &cosmic::Theme,
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style: &renderer::Style,
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layout: Layout<'_>,
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cursor: mouse::Cursor,
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viewport: &Rectangle,
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) {
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use cosmic::iced_core::image::Renderer;
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// TODO desktop background?
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let handle =
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Handle::from_path("/usr/share/backgrounds/pop/kate-hazen-COSMIC-desktop-wallpaper.png");
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let Size { width, height } = renderer.dimensions(&handle);
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let image_size = Size::new(width as f32, height as f32);
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let bounds = layout.bounds();
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let adjusted_fit = ContentFit::Cover.fit(image_size, bounds.size());
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let offset = Vector::new(
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(bounds.width - adjusted_fit.width).max(0.0) / 2.0,
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(bounds.height - adjusted_fit.height).max(0.0) / 2.0,
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);
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let drawing_bounds = Rectangle {
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width: adjusted_fit.width,
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height: adjusted_fit.height,
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..bounds
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};
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renderer.draw(
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handle.clone(),
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FilterMethod::default(),
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drawing_bounds + offset,
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[0.0, 0.0, 0.0, 0.0],
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);
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renderer.with_layer(bounds, |renderer| {
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self.content
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.as_widget()
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.draw(state, renderer, theme, style, layout, cursor, viewport)
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});
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}
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}
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impl<'a, Msg: 'static> From<ImageBg<'a, Msg>> for cosmic::Element<'a, Msg> {
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fn from(widget: ImageBg<'a, Msg>) -> Self {
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cosmic::Element::new(widget)
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}
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}
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