/** Created by Andrey Kulikov on 15.11.14. */
@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
class ViewOverlayPreJellybean extends FrameLayout {
private static final Field FIELD_VIEW_PARENT =
ReflectionUtils.getPrivateField(View.class, "mParent");
private List<Drawable> mDrawableOverlays;
public ViewOverlayPreJellybean(Context context) {
super(context);
init();
}
public ViewOverlayPreJellybean(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public ViewOverlayPreJellybean(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
mDrawableOverlays = new ArrayList<Drawable>();
}
@Override
public void addView(View child, int left, int top) {
if (child.getParent() instanceof ViewGroup) {
ViewGroup parent = (ViewGroup) child.getParent();
LayoutTransition layoutTransition = null;
if (parent.getLayoutTransition() != null) {
layoutTransition = parent.getLayoutTransition();
parent.setLayoutTransition(null);
}
parent.removeView(child);
if (layoutTransition != null) {
parent.setLayoutTransition(layoutTransition);
}
if (child.getParent() != null) {
// LayoutTransition will cause the child to delay removal - cancel it
ViewGroupUtils.cancelLayoutTransition(parent);
// fail-safe if view is still attached for any reason
if (child.getParent() != null && FIELD_VIEW_PARENT != null) {
ReflectionUtils.setFieldValue(child, FIELD_VIEW_PARENT, null);
}
}
if (child.getParent() != null) {
return;
}
}
child.setTag(R.id.overlay_layout_params_backup, child.getLayoutParams());
addView(child, initParams(child, left, top));
invalidate();
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
// Intercept and noop all touch events - overlays do not allow touch events
return false;
}
@Override
public void removeView(View view) {
super.removeView(view);
ViewUtils.setLayoutParamsSilently(
view, (ViewGroup.LayoutParams) view.getTag(R.id.overlay_layout_params_backup));
view.setTag(R.id.overlay_layout_params_backup, null);
}
public void moveView(View view, int left, int top) {
if (view.getParent() == this) {
view.setLayoutParams(initParams(view, left, top));
}
}
private LayoutParams initParams(View view, int left, int top) {
int[] loc = new int[2];
getLocationOnScreen(loc);
final LayoutParams layoutParams =
new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
left -= loc[0];
top -= loc[1];
layoutParams.leftMargin = left;
layoutParams.topMargin = top;
view.setLeft(left);
view.setTop(top);
if (view.getMeasuredWidth() != 0) {
layoutParams.width = view.getMeasuredWidth();
view.setRight(left + layoutParams.width);
}
if (view.getMeasuredHeight() != 0) {
layoutParams.height = view.getMeasuredHeight();
view.setBottom(top + layoutParams.height);
}
return layoutParams;
}
public synchronized void addDrawable(Drawable drawable) {
if (drawable != null) {
this.mDrawableOverlays.add(drawable);
invalidate();
}
}
public synchronized void removeDrawable(Drawable drawable) {
mDrawableOverlays.remove(drawable);
invalidate();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
for (Drawable drawable : mDrawableOverlays) {
drawable.draw(canvas);
}
}
public static ViewOverlayPreJellybean getOverlay(ViewGroup sceneRoot) {
if (sceneRoot != null) {
ViewGroup group = sceneRoot;
while (group.getId() != android.R.id.content
&& group.getParent() != null
&& group.getParent() instanceof ViewGroup) {
group = (ViewGroup) group.getParent();
}
for (int i = 0; i < group.getChildCount(); i++) {
View child = group.getChildAt(i);
if (child instanceof ViewOverlayPreJellybean) {
return (ViewOverlayPreJellybean) child;
}
}
final FrameLayout.LayoutParams params =
new FrameLayout.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
params.gravity = Gravity.FILL;
ViewOverlayPreJellybean viewOverlay = new ViewOverlayPreJellybean(sceneRoot.getContext());
group.addView(viewOverlay, params);
return viewOverlay;
} else {
return null;
}
}
}
