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      1 package com.android.test.hwui;
      2 
      3 import android.content.Context;
      4 import android.graphics.Canvas;
      5 import android.graphics.Paint;
      6 import android.graphics.RectF;
      7 import android.os.Bundle;
      8 
      9 import android.app.Activity;
     10 import android.util.AttributeSet;
     11 import android.graphics.RenderNode;
     12 import android.view.View;
     13 
     14 public class ProjectionActivity extends Activity {
     15     /**
     16      * The content from this view should be projected in between the background of the
     17      * ProjecteeLayout and its children, unclipped.
     18      *
     19      * This view doesn't clip to its bounds (because its parent has clipChildren=false) so that
     20      * when it is projected onto the ProjecteeLayout, it draws outside its view bounds.
     21      */
     22     public static class ProjectedView extends View {
     23         private final Paint mPaint = new Paint();
     24         private final RectF mRectF = new RectF();
     25 
     26         public ProjectedView(Context context) {
     27             this(context, null);
     28         }
     29 
     30         public ProjectedView(Context context, AttributeSet attrs) {
     31             this(context, attrs, 0);
     32         }
     33 
     34         public ProjectedView(Context context, AttributeSet attrs, int defStyleAttr) {
     35             super(context, attrs, defStyleAttr);
     36 
     37             setOnClickListener(new OnClickListener() {
     38                 boolean toggle = false;
     39                 @Override
     40                 public void onClick(View v) {
     41                     toggle = !toggle;
     42                     setProject(toggle);
     43                 }
     44             });
     45         }
     46 
     47         private void setProject(boolean value) {
     48             RenderNode renderNode = updateDisplayListIfDirty();
     49             if (renderNode != null) {
     50                 renderNode.setProjectBackwards(value);
     51             }
     52             // NOTE: we can't invalidate ProjectedView for the redraw because:
     53             // 1) the view won't preserve displayList properties that it doesn't know about
     54             // 2) the damage rect won't be big enough
     55 
     56             // instead, twiddle properties on the container, so that enough area of the screen is
     57             // redrawn without rerecording any DisplayLists.
     58             container.setTranslationX(100f);
     59             container.setTranslationX(0.0f);
     60         }
     61 
     62         @Override
     63         protected void onDraw(Canvas canvas) {
     64             // TODO: set projection flag
     65             final int w = getWidth();
     66             final int h = getHeight();
     67             mRectF.set(0, -h, w, 2 * h);
     68             mPaint.setAntiAlias(true);
     69             mPaint.setColor(0x5f00ff00);
     70             canvas.drawOval(mRectF, mPaint);
     71         }
     72     }
     73 
     74     static View container;
     75 
     76     @Override
     77     protected void onCreate(Bundle savedInstanceState) {
     78         super.onCreate(savedInstanceState);
     79         setContentView(R.layout.projection);
     80         container = findViewById(R.id.container);
     81     }
     82 }
     83