AppRTCDemo: Render each video in a separate SurfaceView

talk/examples/android/src/org/appspot/apprtc/PercentFrameLayout.java

+/*
+ * libjingle
+ * Copyright 2015 Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *  3. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package org.appspot.apprtc;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.View;
+import android.view.ViewGroup;
+
+/**
+ * Simple container that confines the children to a subrectangle specified as percentage values of
+ * the container size. The children are centered horizontally and vertically inside the confined
+ * space.
+ */
+public class PercentFrameLayout extends ViewGroup {
+  private int xPercent = 0;
+  private int yPercent = 0;
+  private int widthPercent = 100;
+  private int heightPercent = 100;
+
+  public PercentFrameLayout(Context context) {
+    super(context);
+  }
+
+  public PercentFrameLayout(Context context, AttributeSet attrs) {
+    super(context, attrs);
+  }
+
+  public PercentFrameLayout(Context context, AttributeSet attrs, int defStyleAttr) {
+    super(context, attrs, defStyleAttr);
+  }
+
+  public void setPosition(int xPercent, int yPercent, int widthPercent, int heightPercent) {
+    this.xPercent = xPercent;
+    this.yPercent = yPercent;
+    this.widthPercent = widthPercent;
+    this.heightPercent = heightPercent;
+  }
+
+  @Override
+  public boolean shouldDelayChildPressedState() {
+    return false;
+  }
+
+  @Override
+  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+    final int width = getDefaultSize(Integer.MAX_VALUE, widthMeasureSpec);
+    final int height = getDefaultSize(Integer.MAX_VALUE, heightMeasureSpec);
+    setMeasuredDimension(
+        MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),
+        MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY));
+
+    final int childWidthMeasureSpec =
+        MeasureSpec.makeMeasureSpec(width * widthPercent / 100, MeasureSpec.AT_MOST);
+    final int childHeightMeasureSpec =
+        MeasureSpec.makeMeasureSpec(height * heightPercent / 100, MeasureSpec.AT_MOST);
+    for (int i = 0; i < getChildCount(); ++i) {
+      final View child = getChildAt(i);
+      if (child.getVisibility() != GONE) {
+        child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
+      }
+    }
+  }
+
+  @Override
+  protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
+    final int width = right - left;
+    final int height = bottom - top;
+    // Sub-rectangle specified by percentage values.
+    final int subWidth = width * widthPercent / 100;
+    final int subHeight = height * heightPercent / 100;
+    final int subLeft = left + width * xPercent / 100;
+    final int subTop = top + height * yPercent / 100;
+
+    for (int i = 0; i < getChildCount(); ++i) {
+      final View child = getChildAt(i);
+      if (child.getVisibility() != GONE) {
+        final int childWidth = child.getMeasuredWidth();
+        final int childHeight = child.getMeasuredHeight();
+        // Center child both vertically and horizontally.
+        final int childLeft = subLeft + (subWidth - childWidth) / 2;
+        final int childTop = subTop + (subHeight - childHeight) / 2;
+        child.layout(childLeft, childTop, childLeft + childWidth, childTop + childHeight);
+      }
+    }
+  }
+}