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.ViewDebug;
9import android.view.ViewGroup;
10import android.widget.FrameLayout;
11
12public class InsettableFrameLayout extends FrameLayout implements
13    ViewGroup.OnHierarchyChangeListener, Insettable {
14
15    @ViewDebug.ExportedProperty(category = "launcher")
16    protected Rect mInsets = new Rect();
17
18    public Rect getInsets() {
19        return mInsets;
20    }
21
22    public InsettableFrameLayout(Context context, AttributeSet attrs) {
23        super(context, attrs);
24        setOnHierarchyChangeListener(this);
25    }
26
27    public void setFrameLayoutChildInsets(View child, Rect newInsets, Rect oldInsets) {
28        final LayoutParams lp = (LayoutParams) child.getLayoutParams();
29
30        if (child instanceof Insettable) {
31            ((Insettable) child).setInsets(newInsets);
32        } else if (!lp.ignoreInsets) {
33            lp.topMargin += (newInsets.top - oldInsets.top);
34            lp.leftMargin += (newInsets.left - oldInsets.left);
35            lp.rightMargin += (newInsets.right - oldInsets.right);
36            lp.bottomMargin += (newInsets.bottom - oldInsets.bottom);
37        }
38        child.setLayoutParams(lp);
39    }
40
41    @Override
42    public void setInsets(Rect insets) {
43        // If the insets haven't changed, this is a no-op. Avoid unnecessary layout caused by
44        // modifying child layout params.
45        if (insets.equals(mInsets)) return;
46
47        final int n = getChildCount();
48        for (int i = 0; i < n; i++) {
49            final View child = getChildAt(i);
50            setFrameLayoutChildInsets(child, insets, mInsets);
51        }
52        mInsets.set(insets);
53    }
54
55    @Override
56    public LayoutParams generateLayoutParams(AttributeSet attrs) {
57        return new InsettableFrameLayout.LayoutParams(getContext(), attrs);
58    }
59
60    @Override
61    protected LayoutParams generateDefaultLayoutParams() {
62        return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
63    }
64
65    // Override to allow type-checking of LayoutParams.
66    @Override
67    protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
68        return p instanceof InsettableFrameLayout.LayoutParams;
69    }
70
71    @Override
72    protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
73        return new LayoutParams(p);
74    }
75
76    public static class LayoutParams extends FrameLayout.LayoutParams {
77        boolean ignoreInsets = false;
78
79        public LayoutParams(Context c, AttributeSet attrs) {
80            super(c, attrs);
81            TypedArray a = c.obtainStyledAttributes(attrs,
82                    R.styleable.InsettableFrameLayout_Layout);
83            ignoreInsets = a.getBoolean(
84                    R.styleable.InsettableFrameLayout_Layout_layout_ignoreInsets, false);
85            a.recycle();
86        }
87
88        public LayoutParams(int width, int height) {
89            super(width, height);
90        }
91
92        public LayoutParams(ViewGroup.LayoutParams lp) {
93            super(lp);
94        }
95    }
96
97    @Override
98    public void onChildViewAdded(View parent, View child) {
99        setFrameLayoutChildInsets(child, mInsets, new Rect());
100    }
101
102    @Override
103    public void onChildViewRemoved(View parent, View child) {
104    }
105
106}
107