84 lines
1.8 KiB
Vala
84 lines
1.8 KiB
Vala
using Gdk;
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// This widget fits a Paintable inside its bounds without letterboxing.
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public class Tooth.Widgets.Background : Gtk.Widget {
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public Paintable? paintable { get; set; default = null; }
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construct {
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add_css_class ("header-image");
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notify["paintable"].connect (() => {
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this.queue_draw ();
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});
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overflow = Gtk.Overflow.HIDDEN;
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}
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public Graphene.Size widget_size {
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get {
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return Graphene.Size () {
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width = get_width (),
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height = get_height ()
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};
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}
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}
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public Graphene.Size image_size {
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get {
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if (paintable == null)
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return Graphene.Size.zero ();
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return Graphene.Size () {
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width = paintable.get_intrinsic_width (),
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height = paintable.get_intrinsic_height ()
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};
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}
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}
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Graphene.Rect get_bounds () {
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var bounds = Graphene.Rect ();
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bounds.init (0, 0, widget_size.width, widget_size.height);
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return bounds;
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}
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public override void snapshot (Gtk.Snapshot snapshot) {
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if (paintable == null)
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return;
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// Get ratio
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float image_ratio;
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var xscale = (float) widget_size.width / image_size.width;
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var yscale = (float) widget_size.height / image_size.height;
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if (xscale > yscale)
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image_ratio = xscale;
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else
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image_ratio = yscale;
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// Start drawing
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snapshot.save ();
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// Clip image
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snapshot.push_clip (get_bounds ());
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// Center the image
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var result_h = image_size.height * image_ratio;
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var result_w = image_size.width * image_ratio;
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var offset_y = (widget_size.height - result_h) / 2;
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var offset_x = (widget_size.width - result_w) / 2;
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var offset = Graphene.Point ();
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offset.init (offset_x, offset_y);
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snapshot.translate (offset);
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// Scale and draw the paintable
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snapshot.scale (image_ratio, image_ratio);
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paintable.snapshot (snapshot, image_size.width, image_size.height);
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// Clean-up
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snapshot.pop ();
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snapshot.restore ();
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base.snapshot (snapshot);
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}
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}
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