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Custom Android ImageView for top-crop scaling of the contained drawable.
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import android.content.Context; | |
import android.graphics.Matrix; | |
import android.widget.ImageView; | |
/** | |
* ImageView to display top-crop scale of an image view. | |
* | |
* @author Chris Arriola | |
*/ | |
public class TopCropImageView extends ImageView { | |
public TopCropImageView(Context context) { | |
super(context); | |
setScaleType(ScaleType.MATRIX); | |
} | |
@Override | |
protected void onLayout(boolean changed, int left, int top, int right, int bottom) { | |
super.onLayout(changed, left, top, right, bottom); | |
recomputeImgMatrix(); | |
} | |
@Override | |
protected boolean setFrame(int l, int t, int r, int b) { | |
recomputeImgMatrix(); | |
return super.setFrame(l, t, r, b); | |
} | |
private void recomputeImgMatrix() { | |
final Matrix matrix = getImageMatrix(); | |
float scale; | |
final int viewWidth = getWidth() - getPaddingLeft() - getPaddingRight(); | |
final int viewHeight = getHeight() - getPaddingTop() - getPaddingBottom(); | |
final int drawableWidth = getDrawable().getIntrinsicWidth(); | |
final int drawableHeight = getDrawable().getIntrinsicHeight(); | |
if (drawableWidth * viewHeight > drawableHeight * viewWidth) { | |
scale = (float) viewHeight / (float) drawableHeight; | |
} else { | |
scale = (float) viewWidth / (float) drawableWidth; | |
} | |
matrix.setScale(scale, scale); | |
setImageMatrix(matrix); | |
} | |
} |
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