Home | History | Annotate | Download | only in widget 
      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.annotation.UnsupportedAppUsage;
     20 import android.annotation.Widget;
     21 import android.content.Context;
     22 import android.util.AttributeSet;
     23 import android.view.LayoutInflater;
     24 import android.view.MotionEvent;
     25 import android.view.View;
     26 import android.view.animation.AlphaAnimation;
     27 
     28 import com.android.internal.R;
     29 
     30 
     31 /**
     32  * The {@code ZoomControls} class displays a simple set of controls used for zooming and
     33  * provides callbacks to register for events.
     34  * @deprecated This functionality and UI is better handled with custom views and layouts
     35  * rather than a dedicated zoom-control widget
     36  */
     37 @Deprecated
     38 @Widget
     39 public class ZoomControls extends LinearLayout {
     40 
     41     @UnsupportedAppUsage
     42     private final ZoomButton mZoomIn;
     43     @UnsupportedAppUsage
     44     private final ZoomButton mZoomOut;
     45 
     46     public ZoomControls(Context context) {
     47         this(context, null);
     48     }
     49 
     50     public ZoomControls(Context context, AttributeSet attrs) {
     51         super(context, attrs);
     52         setFocusable(false);
     53 
     54         LayoutInflater inflater = (LayoutInflater) context
     55                 .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
     56         inflater.inflate(R.layout.zoom_controls, this, // we are the parent
     57                 true);
     58 
     59         mZoomIn = (ZoomButton) findViewById(R.id.zoomIn);
     60         mZoomOut = (ZoomButton) findViewById(R.id.zoomOut);
     61     }
     62 
     63     public void setOnZoomInClickListener(OnClickListener listener) {
     64         mZoomIn.setOnClickListener(listener);
     65     }
     66 
     67     public void setOnZoomOutClickListener(OnClickListener listener) {
     68         mZoomOut.setOnClickListener(listener);
     69     }
     70 
     71     /*
     72      * Sets how fast you get zoom events when the user holds down the
     73      * zoom in/out buttons.
     74      */
     75     public void setZoomSpeed(long speed) {
     76         mZoomIn.setZoomSpeed(speed);
     77         mZoomOut.setZoomSpeed(speed);
     78     }
     79 
     80     @Override
     81     public boolean onTouchEvent(MotionEvent event) {
     82 
     83         /* Consume all touch events so they don't get dispatched to the view
     84          * beneath this view.
     85          */
     86         return true;
     87     }
     88 
     89     public void show() {
     90         fade(View.VISIBLE, 0.0f, 1.0f);
     91     }
     92 
     93     public void hide() {
     94         fade(View.GONE, 1.0f, 0.0f);
     95     }
     96 
     97     private void fade(int visibility, float startAlpha, float endAlpha) {
     98         AlphaAnimation anim = new AlphaAnimation(startAlpha, endAlpha);
     99         anim.setDuration(500);
    100         startAnimation(anim);
    101         setVisibility(visibility);
    102     }
    103 
    104     public void setIsZoomInEnabled(boolean isEnabled) {
    105         mZoomIn.setEnabled(isEnabled);
    106     }
    107 
    108     public void setIsZoomOutEnabled(boolean isEnabled) {
    109         mZoomOut.setEnabled(isEnabled);
    110     }
    111 
    112     @Override
    113     public boolean hasFocus() {
    114         return mZoomIn.hasFocus() || mZoomOut.hasFocus();
    115     }
    116 
    117     @Override
    118     public CharSequence getAccessibilityClassName() {
    119         return ZoomControls.class.getName();
    120     }
    121 }
    122