if (!hasFallback()) {
return;
}
// Draw the fallback in the padding.
final int width = root.getWidth();
final int height = root.getHeight();
int left = width;
int top = height;
int right = 0;
int bottom = 0;
final int childCount = root.getChildCount();
for (int i = 0; i < childCount; i++) {
final View child = root.getChildAt(i);
final Drawable childBg = child.getBackground();
if (child == content) {
// We always count the content view container unless it has no background
// and no children.
if (childBg == null && child instanceof ViewGroup &&
((ViewGroup) child).getChildCount() == 0) {
continue;
}
} else if (child.getVisibility() != View.VISIBLE || childBg == null ||
childBg.getOpacity() != PixelFormat.OPAQUE) {
// Potentially translucent or invisible children don't count, and we assume
// the content view will cover the whole area if we're in a background
// fallback situation.
continue;
}
left = Math.min(left, child.getLeft());
top = Math.min(top, child.getTop());
right = Math.max(right, child.getRight());
bottom = Math.max(bottom, child.getBottom());
}
if (left >= right || top >= bottom) {
// No valid area to draw in.
return;
}
if (top > 0) {
mBackgroundFallback.setBounds(0, 0, width, top);
mBackgroundFallback.draw(c);
}
if (left > 0) {
mBackgroundFallback.setBounds(0, top, left, height);
mBackgroundFallback.draw(c);
}
if (right < width) {
mBackgroundFallback.setBounds(right, top, width, height);
mBackgroundFallback.draw(c);
}
if (bottom < height) {
mBackgroundFallback.setBounds(left, bottom, right, height);
mBackgroundFallback.draw(c);
}
