Home | History | Annotate | Download | only in view 
      1 /*
      2  * Copyright (C) 2007 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.view;
     18 
     19 import android.content.Context;
     20 import android.util.AttributeSet;
     21 import android.util.Log;
     22 import android.widget.TextView;
     23 import com.android.frameworks.coretests.R;
     24 
     25 import android.os.Bundle;
     26 import android.widget.Button;
     27 import android.view.View;
     28 import android.app.Activity;
     29 
     30 /**
     31  * Exercise View's ability to change their visibility: GONE, INVISIBLE and
     32  * VISIBLE.
     33  */
     34 public class VisibilityCallback extends Activity {
     35     private static final boolean DEBUG = false;
     36 
     37     private MonitoredTextView mVictim;
     38 
     39     @Override
     40     protected void onCreate(Bundle icicle) {
     41         super.onCreate(icicle);
     42         setContentView(R.layout.visibility_callback);
     43 
     44         // Find the view whose visibility will change
     45         mVictim = (MonitoredTextView)findViewById(R.id.victim);
     46 
     47         // Find our buttons
     48         Button visibleButton = (Button) findViewById(R.id.vis);
     49         Button invisibleButton = (Button) findViewById(R.id.invis);
     50         Button goneButton = (Button) findViewById(R.id.gone);
     51 
     52         // Wire each button to a click listener
     53         visibleButton.setOnClickListener(mVisibleListener);
     54         invisibleButton.setOnClickListener(mInvisibleListener);
     55         goneButton.setOnClickListener(mGoneListener);
     56     }
     57 
     58 
     59     View.OnClickListener mVisibleListener = new View.OnClickListener() {
     60         public void onClick(View v) {
     61             mVictim.setVisibility(View.VISIBLE);
     62         }
     63     };
     64 
     65     View.OnClickListener mInvisibleListener = new View.OnClickListener() {
     66         public void onClick(View v) {
     67             mVictim.setVisibility(View.INVISIBLE);
     68         }
     69     };
     70 
     71     View.OnClickListener mGoneListener = new View.OnClickListener() {
     72         public void onClick(View v) {
     73             mVictim.setVisibility(View.GONE);
     74         }
     75     };
     76 
     77     public static class MonitoredTextView extends TextView {
     78         private View mLastVisChangedView;
     79         private int mLastChangedVisibility;
     80 
     81         public MonitoredTextView(Context context) {
     82             super(context);
     83         }
     84 
     85         public MonitoredTextView(Context context, AttributeSet attrs) {
     86             super(context, attrs);
     87         }
     88 
     89         public MonitoredTextView(Context context, AttributeSet attrs, int defStyle) {
     90             super(context, attrs, defStyle);
     91         }
     92 
     93         public View getLastVisChangedView() {
     94             return mLastVisChangedView;
     95         }
     96 
     97         public int getLastChangedVisibility() {
     98             return mLastChangedVisibility;
     99         }
    100 
    101         @Override
    102         protected void onVisibilityChanged(View changedView, int visibility) {
    103             mLastVisChangedView = changedView;
    104             mLastChangedVisibility = visibility;
    105 
    106             if (DEBUG) {
    107                 Log.d("viewVis", "visibility: " + visibility);
    108             }
    109         }
    110     }
    111 }
    112