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 static android.support.annotation.RestrictTo.Scope.LIBRARY_GROUP;
20import static android.view.View.MeasureSpec.AT_MOST;
21import static android.view.View.MeasureSpec.EXACTLY;
22import static android.view.View.MeasureSpec.getMode;
23
24import android.content.Context;
25import android.graphics.Rect;
26import android.support.annotation.RestrictTo;
27import android.support.v4.view.ViewCompat;
28import android.util.AttributeSet;
29import android.util.DisplayMetrics;
30import android.util.TypedValue;
31import android.widget.FrameLayout;
32
33/**
34 * @hide
35 */
36public class ContentFrameLayout extends FrameLayout {
37
38    public interface OnAttachListener {
39        void onDetachedFromWindow();
40        void onAttachedFromWindow();
41    }
42
43    private TypedValue mMinWidthMajor;
44    private TypedValue mMinWidthMinor;
45    private TypedValue mFixedWidthMajor;
46    private TypedValue mFixedWidthMinor;
47    private TypedValue mFixedHeightMajor;
48    private TypedValue mFixedHeightMinor;
49
50    private final Rect mDecorPadding;
51
52    private OnAttachListener mAttachListener;
53
54    public ContentFrameLayout(Context context) {
55        this(context, null);
56    }
57
58    public ContentFrameLayout(Context context, AttributeSet attrs) {
59        this(context, attrs, 0);
60    }
61
62    public ContentFrameLayout(Context context, AttributeSet attrs, int defStyleAttr) {
63        super(context, attrs, defStyleAttr);
64        mDecorPadding = new Rect();
65    }
66
67    /**
68     * @hide
69     */
70    @RestrictTo(LIBRARY_GROUP)
71    public void dispatchFitSystemWindows(Rect insets) {
72        fitSystemWindows(insets);
73    }
74
75    public void setAttachListener(OnAttachListener attachListener) {
76        mAttachListener = attachListener;
77    }
78
79    /**
80     * Notify this view of the window decor view's padding. We use these values when working out
81     * our size for the window size attributes.
82     *
83     * @hide
84     */
85    @RestrictTo(LIBRARY_GROUP)
86    public void setDecorPadding(int left, int top, int right, int bottom) {
87        mDecorPadding.set(left, top, right, bottom);
88        if (ViewCompat.isLaidOut(this)) {
89            requestLayout();
90        }
91    }
92
93    @Override
94    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
95        final DisplayMetrics metrics = getContext().getResources().getDisplayMetrics();
96        final boolean isPortrait = metrics.widthPixels < metrics.heightPixels;
97
98        final int widthMode = getMode(widthMeasureSpec);
99        final int heightMode = getMode(heightMeasureSpec);
100
101        boolean fixedWidth = false;
102        if (widthMode == AT_MOST) {
103            final TypedValue tvw = isPortrait ? mFixedWidthMinor : mFixedWidthMajor;
104            if (tvw != null && tvw.type != TypedValue.TYPE_NULL) {
105                int w = 0;
106                if (tvw.type == TypedValue.TYPE_DIMENSION) {
107                    w = (int) tvw.getDimension(metrics);
108                } else if (tvw.type == TypedValue.TYPE_FRACTION) {
109                    w = (int) tvw.getFraction(metrics.widthPixels, metrics.widthPixels);
110                }
111                if (w > 0) {
112                    w -= (mDecorPadding.left + mDecorPadding.right);
113                    final int widthSize = MeasureSpec.getSize(widthMeasureSpec);
114                    widthMeasureSpec = MeasureSpec.makeMeasureSpec(
115                            Math.min(w, widthSize), EXACTLY);
116                    fixedWidth = true;
117                }
118            }
119        }
120
121        if (heightMode == AT_MOST) {
122            final TypedValue tvh = isPortrait ? mFixedHeightMajor : mFixedHeightMinor;
123            if (tvh != null && tvh.type != TypedValue.TYPE_NULL) {
124                int h = 0;
125                if (tvh.type == TypedValue.TYPE_DIMENSION) {
126                    h = (int) tvh.getDimension(metrics);
127                } else if (tvh.type == TypedValue.TYPE_FRACTION) {
128                    h = (int) tvh.getFraction(metrics.heightPixels, metrics.heightPixels);
129                }
130                if (h > 0) {
131                    h -= (mDecorPadding.top + mDecorPadding.bottom);
132                    final int heightSize = MeasureSpec.getSize(heightMeasureSpec);
133                    heightMeasureSpec = MeasureSpec.makeMeasureSpec(
134                            Math.min(h, heightSize), EXACTLY);
135                }
136            }
137        }
138
139        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
140
141        int width = getMeasuredWidth();
142        boolean measure = false;
143
144        widthMeasureSpec = MeasureSpec.makeMeasureSpec(width, EXACTLY);
145
146        if (!fixedWidth && widthMode == AT_MOST) {
147            final TypedValue tv = isPortrait ? mMinWidthMinor : mMinWidthMajor;
148            if (tv != null && tv.type != TypedValue.TYPE_NULL) {
149                int min = 0;
150                if (tv.type == TypedValue.TYPE_DIMENSION) {
151                    min = (int) tv.getDimension(metrics);
152                } else if (tv.type == TypedValue.TYPE_FRACTION) {
153                    min = (int) tv.getFraction(metrics.widthPixels, metrics.widthPixels);
154                }
155                if (min > 0) {
156                    min -= (mDecorPadding.left + mDecorPadding.right);
157                }
158                if (width < min) {
159                    widthMeasureSpec = MeasureSpec.makeMeasureSpec(min, EXACTLY);
160                    measure = true;
161                }
162            }
163        }
164
165        if (measure) {
166            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
167        }
168    }
169
170    public TypedValue getMinWidthMajor() {
171        if (mMinWidthMajor == null) mMinWidthMajor = new TypedValue();
172        return mMinWidthMajor;
173    }
174
175    public TypedValue getMinWidthMinor() {
176        if (mMinWidthMinor == null) mMinWidthMinor = new TypedValue();
177        return mMinWidthMinor;
178    }
179
180    public TypedValue getFixedWidthMajor() {
181        if (mFixedWidthMajor == null) mFixedWidthMajor = new TypedValue();
182        return mFixedWidthMajor;
183    }
184
185    public TypedValue getFixedWidthMinor() {
186        if (mFixedWidthMinor == null) mFixedWidthMinor = new TypedValue();
187        return mFixedWidthMinor;
188    }
189
190    public TypedValue getFixedHeightMajor() {
191        if (mFixedHeightMajor == null) mFixedHeightMajor = new TypedValue();
192        return mFixedHeightMajor;
193    }
194
195    public TypedValue getFixedHeightMinor() {
196        if (mFixedHeightMinor == null) mFixedHeightMinor = new TypedValue();
197        return mFixedHeightMinor;
198    }
199
200    @Override
201    protected void onAttachedToWindow() {
202        super.onAttachedToWindow();
203        if (mAttachListener != null) {
204            mAttachListener.onAttachedFromWindow();
205        }
206    }
207
208    @Override
209    protected void onDetachedFromWindow() {
210        super.onDetachedFromWindow();
211        if (mAttachListener != null) {
212            mAttachListener.onDetachedFromWindow();
213        }
214    }
215}
216