91 lines
2.6 KiB
Rust
91 lines
2.6 KiB
Rust
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use gtk::prelude::*;
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use gtk::subclass::prelude::*;
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use gtk::{gdk, glib};
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mod imp {
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use super::*;
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use once_cell::sync::OnceCell;
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const SIZE: i32 = 128;
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#[derive(Debug, Default)]
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pub struct Thumbnail {
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pub image: OnceCell<gdk::Paintable>,
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}
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#[glib::object_subclass]
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impl ObjectSubclass for Thumbnail {
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const NAME: &'static str = "Thumbnail";
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type Type = super::Thumbnail;
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type ParentType = glib::Object;
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type Interfaces = (gdk::Paintable,);
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}
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impl ObjectImpl for Thumbnail {}
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impl PaintableImpl for Thumbnail {
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fn intrinsic_height(&self, _paintable: &Self::Type) -> i32 {
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let image = self.image.get().unwrap();
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let width = image.intrinsic_width();
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let height = image.intrinsic_height();
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let aspect_ratio = width as f64 / (height as f64).max(std::f64::EPSILON);
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if width >= height {
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(SIZE as f64 / aspect_ratio) as i32
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} else {
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SIZE
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}
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}
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fn intrinsic_width(&self, _paintable: &Self::Type) -> i32 {
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let image = self.image.get().unwrap();
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let width = image.intrinsic_width();
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let height = image.intrinsic_height();
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let aspect_ratio = width as f64 / (height as f64).max(std::f64::EPSILON);
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if width >= height {
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SIZE
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} else {
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(SIZE as f64 * aspect_ratio) as i32
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}
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}
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fn intrinsic_aspect_ratio(&self, _paintable: &Self::Type) -> f64 {
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self.image.get().unwrap().intrinsic_aspect_ratio()
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}
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fn snapshot(
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&self,
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paintable: &Self::Type,
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snapshot: &gdk::Snapshot,
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_width: f64,
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_height: f64,
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) {
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let width = paintable.intrinsic_width() as f64;
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let height = paintable.intrinsic_height() as f64;
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self.image.get().unwrap().snapshot(snapshot, width, height);
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}
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}
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}
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glib::wrapper! {
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/// Thumbnail Paintable
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///
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/// Creates a thumbnail from another paintable. The thumbnail will be drawn
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/// at a maximum size of 128 × 128 taking into account the original
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/// paintable aspect ratio.
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pub struct Thumbnail(ObjectSubclass<imp::Thumbnail>) @implements gdk::Paintable;
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}
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impl Thumbnail {
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pub fn new(paintable: &impl glib::IsA<gdk::Paintable>) -> Self {
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let object = glib::Object::new::<Self>(&[]).unwrap();
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let imp = object.imp();
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imp.image.set(paintable.clone().upcast()).unwrap();
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object
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}
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}
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