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Based on CommonsWare's AspectLockedFrameLayout
package az.dgtl.egg.ui.widget;
import android.content.Context;
import android.support.v7.widget.CardView;
import android.util.AttributeSet;
import android.view.View;
/**
* Based on CommonsWare's AspectLockedFrameLayout
*/
public final class AspectLockedCardView extends CardView {
private double aspectRatio = 0.0;
private AspectRatioSource aspectRatioSource = null;
public AspectLockedCardView(Context context) {
super(context);
}
public AspectLockedCardView(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onMeasure(int widthSpec, int heightSpec) {
double localRatio = aspectRatio;
if (localRatio == 0.0 && aspectRatioSource != null
&& aspectRatioSource.getHeight() > 0) {
localRatio =
(double) aspectRatioSource.getWidth()
/ (double) aspectRatioSource.getHeight();
}
if (localRatio == 0.0) {
super.onMeasure(widthSpec, heightSpec);
} else {
int lockedWidth = MeasureSpec.getSize(widthSpec);
int lockedHeight = MeasureSpec.getSize(heightSpec);
if (lockedWidth == 0 && lockedHeight == 0) {
throw new IllegalArgumentException(
"Both width and height cannot be zero -- watch out for scrollable containers");
}
// Get the padding of the border background.
int hPadding = getPaddingLeft() + getPaddingRight();
int vPadding = getPaddingTop() + getPaddingBottom();
// Resize the preview frame with correct aspect ratio.
lockedWidth -= hPadding;
lockedHeight -= vPadding;
if (lockedHeight > 0 && (lockedWidth > lockedHeight * localRatio)) {
lockedWidth = (int) (lockedHeight * localRatio + .5);
} else {
lockedHeight = (int) (lockedWidth / localRatio + .5);
}
// Add the padding of the border.
lockedWidth += hPadding;
lockedHeight += vPadding;
// Ask children to follow the new preview dimension.
super.onMeasure(MeasureSpec.makeMeasureSpec(lockedWidth, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(lockedHeight, MeasureSpec.EXACTLY));
}
}
public void setAspectRatioSource(View v) {
this.aspectRatioSource = new ViewAspectRatioSource(v);
}
public void setAspectRatioSource(AspectRatioSource aspectRatioSource) {
this.aspectRatioSource = aspectRatioSource;
}
// from com.android.camera.PreviewFrameLayout, with slight
// modifications
public void setAspectRatio(double aspectRatio) {
if (aspectRatio <= 0.0) {
throw new IllegalArgumentException("aspect ratio must be positive");
}
if (this.aspectRatio != aspectRatio) {
this.aspectRatio = aspectRatio;
requestLayout();
}
}
public interface AspectRatioSource {
int getWidth();
int getHeight();
}
private static class ViewAspectRatioSource implements AspectRatioSource {
private View v = null;
ViewAspectRatioSource(View v) {
this.v = v;
}
@Override public int getWidth() {
return (v.getWidth());
}
@Override public int getHeight() {
return (v.getHeight());
}
}
}
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