package com.android.launcher3;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
public class InsettableFrameLayout extends FrameLayout implements
ViewGroup.OnHierarchyChangeListener, Insettable {
protected Rect mInsets = new Rect();
public InsettableFrameLayout(Context context, AttributeSet attrs) {
super(context, attrs);
setOnHierarchyChangeListener(this);
}
public void setFrameLayoutChildInsets(View child, Rect newInsets, Rect oldInsets) {
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
if (child instanceof Insettable) {
((Insettable) child).setInsets(newInsets);
} else if (!lp.ignoreInsets) {
lp.topMargin += (newInsets.top - oldInsets.top);
lp.leftMargin += (newInsets.left - oldInsets.left);
lp.rightMargin += (newInsets.right - oldInsets.right);
lp.bottomMargin += (newInsets.bottom - oldInsets.bottom);
}
child.setLayoutParams(lp);
}
@Override
public void setInsets(Rect insets) {
final int n = getChildCount();
for (int i = 0; i < n; i++) {
final View child = getChildAt(i);
setFrameLayoutChildInsets(child, insets, mInsets);
}
mInsets.set(insets);
}
@Override
public LayoutParams generateLayoutParams(AttributeSet attrs) {
return new LayoutParams(getContext(), attrs);
}
@Override
protected LayoutParams generateDefaultLayoutParams() {
return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
}
// Override to allow type-checking of LayoutParams.
@Override
protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
return p instanceof LayoutParams;
}
@Override
protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
return new LayoutParams(p);
}
public static class LayoutParams extends FrameLayout.LayoutParams {
boolean ignoreInsets = false;
public LayoutParams(Context c, AttributeSet attrs) {
super(c, attrs);
TypedArray a = c.obtainStyledAttributes(attrs,
R.styleable.InsettableFrameLayout_Layout);
ignoreInsets = a.getBoolean(
R.styleable.InsettableFrameLayout_Layout_layout_ignoreInsets, false);
a.recycle();
}
public LayoutParams(int width, int height) {
super(width, height);
}
public LayoutParams(ViewGroup.LayoutParams lp) {
super(lp);
}
}
@Override
public void onChildViewAdded(View parent, View child) {
setFrameLayoutChildInsets(child, mInsets, new Rect());
}
@Override
public void onChildViewRemoved(View parent, View child) {
}
}