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For Android:A subclass of ImageView that scales the image as 'TopCrop' The source image will be scaled to match the view and cropped so the top of the image remains fixed at the top of the view. The bottom will crop according to the view height.
/**
* @author Justin Poliachik
*
* This ImageView subclass allows a scale type of 'TopCrop'
* The src image will be scaled to match the view and cropped
* so that the top of the image remains fixed.
* The bottom will crop according to the view height.
*/
public class TopCropImage extends ImageView{
public TopCropImage(Context context) {
super(context);
setup();
}
public TopCropImage(Context context, AttributeSet attrs) {
super(context, attrs);
setup();
}
public TopCropImage(Context context, AttributeSet attrs,
int defStyle) {
super(context, attrs, defStyle);
setup();
}
private void setup() {
setScaleType(ScaleType.MATRIX);
}
@Override
protected boolean setFrame(int l, int t, int r, int b) {
Matrix matrix = getImageMatrix();
float scale;
int viewWidth = getWidth() - getPaddingLeft() - getPaddingRight();
int viewHeight = getHeight() - getPaddingTop() - getPaddingBottom();
int drawableWidth = getDrawable().getIntrinsicWidth();
int drawableHeight = getDrawable().getIntrinsicHeight();
//Get the scale
if (drawableWidth * viewHeight > drawableHeight * viewWidth) {
scale = (float) viewHeight / (float) drawableHeight;
} else {
scale = (float) viewWidth / (float) drawableWidth;
}
//Define the rect to take image portion from
RectF drawableRect = new RectF(0, 0, drawableWidth, drawableHeight - (viewHeight / scale));
RectF viewRect = new RectF(0, 0, viewWidth, viewHeight);
matrix.setRectToRect(drawableRect, viewRect, Matrix.ScaleToFit.FILL);
setImageMatrix(matrix);
return super.setFrame(l, t, r, b);
}
}
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