1package com.android.launcher3;
2
3import android.content.Context;
4import android.content.res.TypedArray;
5import android.graphics.Rect;
6import android.util.AttributeSet;
7import android.view.View;
8import android.view.ViewGroup;
9import android.widget.FrameLayout;
10
11public class InsettableFrameLayout extends FrameLayout implements
12    ViewGroup.OnHierarchyChangeListener, Insettable {
13
14    protected Rect mInsets = new Rect();
15
16    public InsettableFrameLayout(Context context, AttributeSet attrs) {
17        super(context, attrs);
18        setOnHierarchyChangeListener(this);
19    }
20
21    public void setFrameLayoutChildInsets(View child, Rect newInsets, Rect oldInsets) {
22        final LayoutParams lp = (LayoutParams) child.getLayoutParams();
23
24        if (child instanceof Insettable) {
25            ((Insettable) child).setInsets(newInsets);
26        } else if (!lp.ignoreInsets) {
27            lp.topMargin += (newInsets.top - oldInsets.top);
28            lp.leftMargin += (newInsets.left - oldInsets.left);
29            lp.rightMargin += (newInsets.right - oldInsets.right);
30            lp.bottomMargin += (newInsets.bottom - oldInsets.bottom);
31        }
32        child.setLayoutParams(lp);
33    }
34
35    @Override
36    public void setInsets(Rect insets) {
37        final int n = getChildCount();
38        for (int i = 0; i < n; i++) {
39            final View child = getChildAt(i);
40            setFrameLayoutChildInsets(child, insets, mInsets);
41        }
42        mInsets.set(insets);
43    }
44
45    @Override
46    public LayoutParams generateLayoutParams(AttributeSet attrs) {
47        return new InsettableFrameLayout.LayoutParams(getContext(), attrs);
48    }
49
50    @Override
51    protected LayoutParams generateDefaultLayoutParams() {
52        return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
53    }
54
55    // Override to allow type-checking of LayoutParams.
56    @Override
57    protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
58        return p instanceof InsettableFrameLayout.LayoutParams;
59    }
60
61    @Override
62    protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
63        return new LayoutParams(p);
64    }
65
66    public static class LayoutParams extends FrameLayout.LayoutParams {
67        boolean ignoreInsets = false;
68
69        public LayoutParams(Context c, AttributeSet attrs) {
70            super(c, attrs);
71            TypedArray a = c.obtainStyledAttributes(attrs,
72                    R.styleable.InsettableFrameLayout_Layout);
73            ignoreInsets = a.getBoolean(
74                    R.styleable.InsettableFrameLayout_Layout_layout_ignoreInsets, false);
75            a.recycle();
76        }
77
78        public LayoutParams(int width, int height) {
79            super(width, height);
80        }
81
82        public LayoutParams(ViewGroup.LayoutParams lp) {
83            super(lp);
84        }
85    }
86
87    @Override
88    public void onChildViewAdded(View parent, View child) {
89        setFrameLayoutChildInsets(child, mInsets, new Rect());
90    }
91
92    @Override
93    public void onChildViewRemoved(View parent, View child) {
94    }
95
96}
97