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1/*
2 * Copyright (C) 2014 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.v7.widget;
18
19import android.content.Context;
20import android.graphics.Rect;
21import android.support.v4.view.ViewCompat;
22import android.util.AttributeSet;
23import android.util.DisplayMetrics;
24import android.util.TypedValue;
25import android.widget.FrameLayout;
26
27import static android.view.View.MeasureSpec.AT_MOST;
28import static android.view.View.MeasureSpec.EXACTLY;
29import static android.view.View.MeasureSpec.getMode;
30
31/**
32 * @hide
33 */
34public class ContentFrameLayout extends FrameLayout {
35
36    public interface OnAttachListener {
37        void onDetachedFromWindow();
38        void onAttachedFromWindow();
39    }
40
41    private TypedValue mMinWidthMajor;
42    private TypedValue mMinWidthMinor;
43    private TypedValue mFixedWidthMajor;
44    private TypedValue mFixedWidthMinor;
45    private TypedValue mFixedHeightMajor;
46    private TypedValue mFixedHeightMinor;
47
48    private final Rect mDecorPadding;
49
50    private OnAttachListener mAttachListener;
51
52    public ContentFrameLayout(Context context) {
53        this(context, null);
54    }
55
56    public ContentFrameLayout(Context context, AttributeSet attrs) {
57        this(context, attrs, 0);
58    }
59
60    public ContentFrameLayout(Context context, AttributeSet attrs, int defStyleAttr) {
61        super(context, attrs, defStyleAttr);
62        mDecorPadding = new Rect();
63    }
64
65    /**
66     * @hide
67     */
68    public void dispatchFitSystemWindows(Rect insets) {
69        fitSystemWindows(insets);
70    }
71
72    public void setAttachListener(OnAttachListener attachListener) {
73        mAttachListener = attachListener;
74    }
75
76    /**
77     * Notify this view of the window decor view's padding. We use these values when working out
78     * our size for the window size attributes.
79     *
80     * @hide
81     */
82    public void setDecorPadding(int left, int top, int right, int bottom) {
83        mDecorPadding.set(left, top, right, bottom);
84        if (ViewCompat.isLaidOut(this)) {
85            requestLayout();
86        }
87    }
88
89    @Override
90    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
91        final DisplayMetrics metrics = getContext().getResources().getDisplayMetrics();
92        final boolean isPortrait = metrics.widthPixels < metrics.heightPixels;
93
94        final int widthMode = getMode(widthMeasureSpec);
95        final int heightMode = getMode(heightMeasureSpec);
96
97        boolean fixedWidth = false;
98        if (widthMode == AT_MOST) {
99            final TypedValue tvw = isPortrait ? mFixedWidthMinor : mFixedWidthMajor;
100            if (tvw != null && tvw.type != TypedValue.TYPE_NULL) {
101                int w = 0;
102                if (tvw.type == TypedValue.TYPE_DIMENSION) {
103                    w = (int) tvw.getDimension(metrics);
104                } else if (tvw.type == TypedValue.TYPE_FRACTION) {
105                    w = (int) tvw.getFraction(metrics.widthPixels, metrics.widthPixels);
106                }
107                if (w > 0) {
108                    w -= (mDecorPadding.left + mDecorPadding.right);
109                    final int widthSize = MeasureSpec.getSize(widthMeasureSpec);
110                    widthMeasureSpec = MeasureSpec.makeMeasureSpec(
111                            Math.min(w, widthSize), EXACTLY);
112                    fixedWidth = true;
113                }
114            }
115        }
116
117        if (heightMode == AT_MOST) {
118            final TypedValue tvh = isPortrait ? mFixedHeightMajor : mFixedHeightMinor;
119            if (tvh != null && tvh.type != TypedValue.TYPE_NULL) {
120                int h = 0;
121                if (tvh.type == TypedValue.TYPE_DIMENSION) {
122                    h = (int) tvh.getDimension(metrics);
123                } else if (tvh.type == TypedValue.TYPE_FRACTION) {
124                    h = (int) tvh.getFraction(metrics.heightPixels, metrics.heightPixels);
125                }
126                if (h > 0) {
127                    h -= (mDecorPadding.top + mDecorPadding.bottom);
128                    final int heightSize = MeasureSpec.getSize(heightMeasureSpec);
129                    heightMeasureSpec = MeasureSpec.makeMeasureSpec(
130                            Math.min(h, heightSize), EXACTLY);
131                }
132            }
133        }
134
135        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
136
137        int width = getMeasuredWidth();
138        boolean measure = false;
139
140        widthMeasureSpec = MeasureSpec.makeMeasureSpec(width, EXACTLY);
141
142        if (!fixedWidth && widthMode == AT_MOST) {
143            final TypedValue tv = isPortrait ? mMinWidthMinor : mMinWidthMajor;
144            if (tv != null && tv.type != TypedValue.TYPE_NULL) {
145                int min = 0;
146                if (tv.type == TypedValue.TYPE_DIMENSION) {
147                    min = (int) tv.getDimension(metrics);
148                } else if (tv.type == TypedValue.TYPE_FRACTION) {
149                    min = (int) tv.getFraction(metrics.widthPixels, metrics.widthPixels);
150                }
151                if (min > 0) {
152                    min -= (mDecorPadding.left + mDecorPadding.right);
153                }
154                if (width < min) {
155                    widthMeasureSpec = MeasureSpec.makeMeasureSpec(min, EXACTLY);
156                    measure = true;
157                }
158            }
159        }
160
161        if (measure) {
162            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
163        }
164    }
165
166    public TypedValue getMinWidthMajor() {
167        if (mMinWidthMajor == null) mMinWidthMajor = new TypedValue();
168        return mMinWidthMajor;
169    }
170
171    public TypedValue getMinWidthMinor() {
172        if (mMinWidthMinor == null) mMinWidthMinor = new TypedValue();
173        return mMinWidthMinor;
174    }
175
176    public TypedValue getFixedWidthMajor() {
177        if (mFixedWidthMajor == null) mFixedWidthMajor = new TypedValue();
178        return mFixedWidthMajor;
179    }
180
181    public TypedValue getFixedWidthMinor() {
182        if (mFixedWidthMinor == null) mFixedWidthMinor = new TypedValue();
183        return mFixedWidthMinor;
184    }
185
186    public TypedValue getFixedHeightMajor() {
187        if (mFixedHeightMajor == null) mFixedHeightMajor = new TypedValue();
188        return mFixedHeightMajor;
189    }
190
191    public TypedValue getFixedHeightMinor() {
192        if (mFixedHeightMinor == null) mFixedHeightMinor = new TypedValue();
193        return mFixedHeightMinor;
194    }
195
196    @Override
197    protected void onAttachedToWindow() {
198        super.onAttachedToWindow();
199        if (mAttachListener != null) {
200            mAttachListener.onAttachedFromWindow();
201        }
202    }
203
204    @Override
205    protected void onDetachedFromWindow() {
206        super.onDetachedFromWindow();
207        if (mAttachListener != null) {
208            mAttachListener.onDetachedFromWindow();
209        }
210    }
211}
212