1package com.bumptech.glide.request.target;
2
3import android.graphics.drawable.Drawable;
4import android.widget.ImageView;
5import com.bumptech.glide.request.GlideAnimation;
6
7public class DrawableImageViewTarget extends ViewTarget<ImageView, Drawable> {
8    private static final float SQUARE_RATIO_MARGIN = 0.05f;
9    private final ImageView view;
10
11    public DrawableImageViewTarget(ImageView view) {
12        super(view);
13        this.view = view;
14    }
15
16    @Override
17    public void onResourceReady(Drawable resource, GlideAnimation<Drawable> animation) {
18
19        //TODO: Try to generalize this to other sizes/shapes.
20        // This is a dirty hack that tries to make loading square thumbnails and then square full images less costly by
21        // forcing both the smaller thumb and the larger version to have exactly the same intrinsic dimensions. If a
22        // drawable is replaced in an ImageView by another drawable with different intrinsic dimensions, the ImageView
23        // requests a layout. Scrolling rapidly while replacing thumbs with larger images triggers lots of these calls
24        // and causes significant amounts of jank.
25        float viewRatio = view.getWidth() / (float) view.getHeight();
26        float drawableRatio = resource.getIntrinsicWidth() / (float) resource.getIntrinsicHeight();
27        if (Math.abs(viewRatio - 1f) <= SQUARE_RATIO_MARGIN && Math.abs(drawableRatio - 1f) <= SQUARE_RATIO_MARGIN) {
28            resource = new SquaringDrawable(resource, view.getWidth());
29        }
30
31        if (animation == null || !animation.animate(view.getDrawable(), resource, view, this)) {
32            view.setImageDrawable(resource);
33        }
34    }
35
36    @Override
37    public void setPlaceholder(Drawable placeholder) {
38        view.setImageDrawable(placeholder);
39    }
40}
41