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/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko.util;
import android.graphics.Rect;
import android.view.TouchDelegate;
import android.view.View;
import org.mozilla.gecko.R;
public class TouchTargetUtil {
/**
* Ensures that a given targetView has a large enough touch area to ensure it can be selected.
* A TouchDelegate will be added to the enclosingView as necessary.
*
* @param targetView
* @param enclosingView
*/
public static void ensureTargetHitArea(final View targetView, final View enclosingView) {
enclosingView.post(new Runnable() {
@Override
public void run() {
Rect delegateArea = new Rect();
targetView.getHitRect(delegateArea);
final int targetHitArea = enclosingView.getContext().getResources().getDimensionPixelSize(R.dimen.touch_target_size);
final int widthDelta = (targetHitArea - delegateArea.width()) / 2;
delegateArea.right += widthDelta;
delegateArea.left -= widthDelta;
final int heightDelta = (targetHitArea - delegateArea.height()) / 2;
delegateArea.bottom += heightDelta;
delegateArea.top -= heightDelta;
if (heightDelta <= 0 && widthDelta <= 0) {
return;
}
TouchDelegate touchDelegate = new TouchDelegate(delegateArea, targetView);
enclosingView.setTouchDelegate(touchDelegate);
}
});
}
}
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