1 /* 2 * Copyright (C) 2011 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 com.example.android.apis.view; 18 19 import com.example.android.apis.R; 20 21 import android.content.Context; 22 import android.util.AttributeSet; 23 import android.view.MotionEvent; 24 import android.widget.LinearLayout; 25 import android.widget.TextView; 26 27 /** 28 * Part of the {@link Hover} demo activity. 29 * 30 * The Interceptor view is a simple subclass of LinearLayout whose sole purpose 31 * is to override {@link #onInterceptHoverEvent}. When the checkbox in the 32 * hover activity is checked, the interceptor view will intercept hover events. 33 * 34 * When this view intercepts hover events, its children will not receive 35 * hover events. This can be useful in some cases when implementing a custom 36 * view group that would like to prevent its children from being hovered 37 * under certain situations. Usually such custom views will be much more 38 * interesting and complex than our little Interceptor example here. 39 */ 40 public class HoverInterceptorView extends LinearLayout { 41 private boolean mInterceptHover; 42 43 public HoverInterceptorView(Context context, AttributeSet attrs) { 44 super(context, attrs); 45 } 46 47 @Override 48 public boolean onInterceptHoverEvent(MotionEvent event) { 49 if (mInterceptHover) { 50 return true; 51 } 52 return super.onInterceptHoverEvent(event); 53 } 54 55 @Override 56 public boolean onHoverEvent(MotionEvent event) { 57 TextView textView = (TextView) findViewById(R.id.intercept_message); 58 if (mInterceptHover && event.getAction() != MotionEvent.ACTION_HOVER_EXIT) { 59 textView.setText(getResources().getString( 60 R.string.hover_intercept_message_intercepted)); 61 return true; 62 } 63 textView.setText(getResources().getString( 64 R.string.hover_intercept_message_initial)); 65 return super.onHoverEvent(event); 66 } 67 68 public void setInterceptHover(boolean intercept) { 69 mInterceptHover = intercept; 70 } 71 } 72
