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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.view.RenderNode;
     12 import android.view.View;
     13 import android.widget.LinearLayout;
     14 
     15 public class ProjectionActivity extends Activity {
     16     /**
     17      * The content from this view should be projected in between the background of the
     18      * ProjecteeLayout and its children, unclipped.
     19      *
     20      * This view doesn't clip to its bounds (because its parent has clipChildren=false) so that
     21      * when it is projected onto the ProjecteeLayout, it draws outside its view bounds.
     22      */
     23     public static class ProjectedView extends View {
     24         private final Paint mPaint = new Paint();
     25         private final RectF mRectF = new RectF();
     26 
     27         public ProjectedView(Context context) {
     28             this(context, null);
     29         }
     30 
     31         public ProjectedView(Context context, AttributeSet attrs) {
     32             this(context, attrs, 0);
     33         }
     34 
     35         public ProjectedView(Context context, AttributeSet attrs, int defStyleAttr) {
     36             super(context, attrs, defStyleAttr);
     37 
     38             setOnClickListener(new OnClickListener() {
     39                 boolean toggle = false;
     40                 @Override
     41                 public void onClick(View v) {
     42                     toggle = !toggle;
     43                     setProject(toggle);
     44                 }
     45             });
     46         }
     47 
     48         private void setProject(boolean value) {
     49             RenderNode renderNode = updateDisplayListIfDirty();
     50             if (renderNode != null) {
     51                 renderNode.setProjectBackwards(value);
     52             }
     53             // NOTE: we can't invalidate ProjectedView for the redraw because:
     54             // 1) the view won't preserve displayList properties that it doesn't know about
     55             // 2) the damage rect won't be big enough
     56 
     57             // instead, twiddle properties on the container, so that enough area of the screen is
     58             // redrawn without rerecording any DisplayLists.
     59             container.setTranslationX(100f);
     60             container.setTranslationX(0.0f);
     61         }
     62 
     63         @Override
     64         protected void onDraw(Canvas canvas) {
     65             // TODO: set projection flag
     66             final int w = getWidth();
     67             final int h = getHeight();
     68             mRectF.set(0, -h, w, 2 * h);
     69             mPaint.setAntiAlias(true);
     70             mPaint.setColor(0x5f00ff00);
     71             canvas.drawOval(mRectF, mPaint);
     72         }
     73     }
     74 
     75     static View container;
     76 
     77     @Override
     78     protected void onCreate(Bundle savedInstanceState) {
     79         super.onCreate(savedInstanceState);
     80         setContentView(R.layout.projection);
     81         container = findViewById(R.id.container);
     82     }
     83 }
     84