package com.android.test.hwui; import android.content.Context; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.RectF; import android.os.Bundle; import android.app.Activity; import android.util.AttributeSet; import android.graphics.RenderNode; import android.view.View; public class ProjectionActivity extends Activity { /** * The content from this view should be projected in between the background of the * ProjecteeLayout and its children, unclipped. * * This view doesn't clip to its bounds (because its parent has clipChildren=false) so that * when it is projected onto the ProjecteeLayout, it draws outside its view bounds. */ public static class ProjectedView extends View { private final Paint mPaint = new Paint(); private final RectF mRectF = new RectF(); public ProjectedView(Context context) { this(context, null); } public ProjectedView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public ProjectedView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); setOnClickListener(new OnClickListener() { boolean toggle = false; @Override public void onClick(View v) { toggle = !toggle; setProject(toggle); } }); } private void setProject(boolean value) { RenderNode renderNode = updateDisplayListIfDirty(); if (renderNode != null) { renderNode.setProjectBackwards(value); } // NOTE: we can't invalidate ProjectedView for the redraw because: // 1) the view won't preserve displayList properties that it doesn't know about // 2) the damage rect won't be big enough // instead, twiddle properties on the container, so that enough area of the screen is // redrawn without rerecording any DisplayLists. container.setTranslationX(100f); container.setTranslationX(0.0f); } @Override protected void onDraw(Canvas canvas) { // TODO: set projection flag final int w = getWidth(); final int h = getHeight(); mRectF.set(0, -h, w, 2 * h); mPaint.setAntiAlias(true); mPaint.setColor(0x5f00ff00); canvas.drawOval(mRectF, mPaint); } } static View container; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.projection); container = findViewById(R.id.container); } }