1 /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*- 2 * This Source Code Form is subject to the terms of the Mozilla Public 3 * License, v. 2.0. If a copy of the MPL was not distributed with this 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 5 6 package org.mozilla.gecko.util; 7 8 import android.graphics.Rect; 9 import android.view.TouchDelegate; 10 import android.view.View; 11 12 import org.mozilla.gecko.R; 13 import org.mozilla.gecko.widget.TouchDelegateWithReset; 14 15 public class TouchTargetUtil { 16 /** 17 * Ensures that a given targetView has a large enough touch area to ensure it can be selected. 18 * A TouchDelegate will be added to the enclosingView as necessary. 19 * 20 * @param targetView 21 * @param enclosingView 22 */ ensureTargetHitArea(final View targetView, final View enclosingView)23 public static void ensureTargetHitArea(final View targetView, final View enclosingView) { 24 enclosingView.post(new Runnable() { 25 @Override 26 public void run() { 27 Rect delegateArea = new Rect(); 28 targetView.getHitRect(delegateArea); 29 30 final int targetHitArea = enclosingView.getContext().getResources().getDimensionPixelSize(R.dimen.touch_target_size); 31 32 final int widthDelta = (targetHitArea - delegateArea.width()) / 2; 33 delegateArea.right += widthDelta; 34 delegateArea.left -= widthDelta; 35 36 final int heightDelta = (targetHitArea - delegateArea.height()) / 2; 37 delegateArea.bottom += heightDelta; 38 delegateArea.top -= heightDelta; 39 40 if (heightDelta <= 0 && widthDelta <= 0) { 41 return; 42 } 43 44 TouchDelegate touchDelegate = new TouchDelegateWithReset(delegateArea, targetView); 45 enclosingView.setTouchDelegate(touchDelegate); 46 } 47 }); 48 } 49 } 50