1 /* 2 * Copyright (C) 2008 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.widget; 18 19 import android.content.Context; 20 import android.os.Handler; 21 import android.util.AttributeSet; 22 import android.view.KeyEvent; 23 import android.view.MotionEvent; 24 import android.view.View; 25 import android.view.View.OnLongClickListener; 26 27 public class ZoomButton extends ImageButton implements OnLongClickListener { 28 29 private final Handler mHandler; 30 private final Runnable mRunnable = new Runnable() { 31 public void run() { 32 if ((mOnClickListener != null) && mIsInLongpress && isEnabled()) { 33 mOnClickListener.onClick(ZoomButton.this); 34 mHandler.postDelayed(this, mZoomSpeed); 35 } 36 } 37 }; 38 39 private long mZoomSpeed = 1000; 40 private boolean mIsInLongpress; 41 ZoomButton(Context context)42 public ZoomButton(Context context) { 43 this(context, null); 44 } 45 ZoomButton(Context context, AttributeSet attrs)46 public ZoomButton(Context context, AttributeSet attrs) { 47 this(context, attrs, 0); 48 } 49 ZoomButton(Context context, AttributeSet attrs, int defStyle)50 public ZoomButton(Context context, AttributeSet attrs, int defStyle) { 51 super(context, attrs, defStyle); 52 mHandler = new Handler(); 53 setOnLongClickListener(this); 54 } 55 56 @Override onTouchEvent(MotionEvent event)57 public boolean onTouchEvent(MotionEvent event) { 58 if ((event.getAction() == MotionEvent.ACTION_CANCEL) 59 || (event.getAction() == MotionEvent.ACTION_UP)) { 60 mIsInLongpress = false; 61 } 62 return super.onTouchEvent(event); 63 } 64 setZoomSpeed(long speed)65 public void setZoomSpeed(long speed) { 66 mZoomSpeed = speed; 67 } 68 onLongClick(View v)69 public boolean onLongClick(View v) { 70 mIsInLongpress = true; 71 mHandler.post(mRunnable); 72 return true; 73 } 74 75 @Override onKeyUp(int keyCode, KeyEvent event)76 public boolean onKeyUp(int keyCode, KeyEvent event) { 77 mIsInLongpress = false; 78 return super.onKeyUp(keyCode, event); 79 } 80 81 @Override setEnabled(boolean enabled)82 public void setEnabled(boolean enabled) { 83 if (!enabled) { 84 85 /* If we're being disabled reset the state back to unpressed 86 * as disabled views don't get events and therefore we won't 87 * get the up event to reset the state. 88 */ 89 setPressed(false); 90 } 91 super.setEnabled(enabled); 92 } 93 94 @Override dispatchUnhandledMove(View focused, int direction)95 public boolean dispatchUnhandledMove(View focused, int direction) { 96 clearFocus(); 97 return super.dispatchUnhandledMove(focused, direction); 98 } 99 } 100