1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package android.support.design.widget;
18
19import android.content.Context;
20import android.util.AttributeSet;
21import android.view.View;
22
23/**
24 * Behavior will automatically sets up a {@link ViewOffsetHelper} on a {@link View}.
25 */
26class ViewOffsetBehavior<V extends View> extends CoordinatorLayout.Behavior<V> {
27
28    private ViewOffsetHelper mViewOffsetHelper;
29
30    private int mTempTopBottomOffset = 0;
31    private int mTempLeftRightOffset = 0;
32
33    public ViewOffsetBehavior() {}
34
35    public ViewOffsetBehavior(Context context, AttributeSet attrs) {
36        super(context, attrs);
37    }
38
39    @Override
40    public boolean onLayoutChild(CoordinatorLayout parent, V child, int layoutDirection) {
41        // First let lay the child out
42        layoutChild(parent, child, layoutDirection);
43
44        if (mViewOffsetHelper == null) {
45            mViewOffsetHelper = new ViewOffsetHelper(child);
46        }
47        mViewOffsetHelper.onViewLayout();
48
49        if (mTempTopBottomOffset != 0) {
50            mViewOffsetHelper.setTopAndBottomOffset(mTempTopBottomOffset);
51            mTempTopBottomOffset = 0;
52        }
53        if (mTempLeftRightOffset != 0) {
54            mViewOffsetHelper.setLeftAndRightOffset(mTempLeftRightOffset);
55            mTempLeftRightOffset = 0;
56        }
57
58        return true;
59    }
60
61    protected void layoutChild(CoordinatorLayout parent, V child, int layoutDirection) {
62        // Let the parent lay it out by default
63        parent.onLayoutChild(child, layoutDirection);
64    }
65
66    public boolean setTopAndBottomOffset(int offset) {
67        if (mViewOffsetHelper != null) {
68            return mViewOffsetHelper.setTopAndBottomOffset(offset);
69        } else {
70            mTempTopBottomOffset = offset;
71        }
72        return false;
73    }
74
75    public boolean setLeftAndRightOffset(int offset) {
76        if (mViewOffsetHelper != null) {
77            return mViewOffsetHelper.setLeftAndRightOffset(offset);
78        } else {
79            mTempLeftRightOffset = offset;
80        }
81        return false;
82    }
83
84    public int getTopAndBottomOffset() {
85        return mViewOffsetHelper != null ? mViewOffsetHelper.getTopAndBottomOffset() : 0;
86    }
87
88    public int getLeftAndRightOffset() {
89        return mViewOffsetHelper != null ? mViewOffsetHelper.getLeftAndRightOffset() : 0;
90    }
91}