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 InsettableFrameLayout.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 InsettableFrameLayout.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) { } }