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.internal.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    private TypedValue mMinWidthMajor;
37    private TypedValue mMinWidthMinor;
38    private TypedValue mFixedWidthMajor;
39    private TypedValue mFixedWidthMinor;
40    private TypedValue mFixedHeightMajor;
41    private TypedValue mFixedHeightMinor;
42
43    private final Rect mDecorPadding;
44
45    public ContentFrameLayout(Context context) {
46        this(context, null);
47    }
48
49    public ContentFrameLayout(Context context, AttributeSet attrs) {
50        this(context, attrs, 0);
51    }
52
53    public ContentFrameLayout(Context context, AttributeSet attrs, int defStyleAttr) {
54        super(context, attrs, defStyleAttr);
55        mDecorPadding = new Rect();
56    }
57
58    /**
59     * @hide
60     */
61    public void dispatchFitSystemWindows(Rect insets) {
62        fitSystemWindows(insets);
63    }
64
65    /**
66     * Notify this view of the window decor view's padding. We use these values when working out
67     * our size for the window size attributes.
68     *
69     * @hide
70     */
71    public void setDecorPadding(int left, int top, int right, int bottom) {
72        mDecorPadding.set(left, top, right, bottom);
73        if (ViewCompat.isLaidOut(this)) {
74            requestLayout();
75        }
76    }
77
78    @Override
79    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
80        final DisplayMetrics metrics = getContext().getResources().getDisplayMetrics();
81        final boolean isPortrait = metrics.widthPixels < metrics.heightPixels;
82
83        final int widthMode = getMode(widthMeasureSpec);
84        final int heightMode = getMode(heightMeasureSpec);
85
86        boolean fixedWidth = false;
87        if (widthMode == AT_MOST) {
88            final TypedValue tvw = isPortrait ? mFixedWidthMinor : mFixedWidthMajor;
89            if (tvw != null && tvw.type != TypedValue.TYPE_NULL) {
90                int w = 0;
91                if (tvw.type == TypedValue.TYPE_DIMENSION) {
92                    w = (int) tvw.getDimension(metrics);
93                } else if (tvw.type == TypedValue.TYPE_FRACTION) {
94                    w = (int) tvw.getFraction(metrics.widthPixels, metrics.widthPixels);
95                }
96                if (w > 0) {
97                    w -= (mDecorPadding.left + mDecorPadding.right);
98                    final int widthSize = MeasureSpec.getSize(widthMeasureSpec);
99                    widthMeasureSpec = MeasureSpec.makeMeasureSpec(
100                            Math.min(w, widthSize), EXACTLY);
101                    fixedWidth = true;
102                }
103            }
104        }
105
106        if (heightMode == AT_MOST) {
107            final TypedValue tvh = isPortrait ? mFixedHeightMajor : mFixedHeightMinor;
108            if (tvh != null && tvh.type != TypedValue.TYPE_NULL) {
109                int h = 0;
110                if (tvh.type == TypedValue.TYPE_DIMENSION) {
111                    h = (int) tvh.getDimension(metrics);
112                } else if (tvh.type == TypedValue.TYPE_FRACTION) {
113                    h = (int) tvh.getFraction(metrics.heightPixels, metrics.heightPixels);
114                }
115                if (h > 0) {
116                    h -= (mDecorPadding.top + mDecorPadding.bottom);
117                    final int heightSize = MeasureSpec.getSize(heightMeasureSpec);
118                    heightMeasureSpec = MeasureSpec.makeMeasureSpec(
119                            Math.min(h, heightSize), EXACTLY);
120                }
121            }
122        }
123
124        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
125
126        int width = getMeasuredWidth();
127        boolean measure = false;
128
129        widthMeasureSpec = MeasureSpec.makeMeasureSpec(width, EXACTLY);
130
131        if (!fixedWidth && widthMode == AT_MOST) {
132            final TypedValue tv = isPortrait ? mMinWidthMinor : mMinWidthMajor;
133            if (tv != null && tv.type != TypedValue.TYPE_NULL) {
134                int min = 0;
135                if (tv.type == TypedValue.TYPE_DIMENSION) {
136                    min = (int) tv.getDimension(metrics);
137                } else if (tv.type == TypedValue.TYPE_FRACTION) {
138                    min = (int) tv.getFraction(metrics.widthPixels, metrics.widthPixels);
139                }
140                if (min > 0) {
141                    min -= (mDecorPadding.left + mDecorPadding.right);
142                }
143                if (width < min) {
144                    widthMeasureSpec = MeasureSpec.makeMeasureSpec(min, EXACTLY);
145                    measure = true;
146                }
147            }
148        }
149
150        if (measure) {
151            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
152        }
153    }
154
155    public TypedValue getMinWidthMajor() {
156        if (mMinWidthMajor == null) mMinWidthMajor = new TypedValue();
157        return mMinWidthMajor;
158    }
159
160    public TypedValue getMinWidthMinor() {
161        if (mMinWidthMinor == null) mMinWidthMinor = new TypedValue();
162        return mMinWidthMinor;
163    }
164
165    public TypedValue getFixedWidthMajor() {
166        if (mFixedWidthMajor == null) mFixedWidthMajor = new TypedValue();
167        return mFixedWidthMajor;
168    }
169
170    public TypedValue getFixedWidthMinor() {
171        if (mFixedWidthMinor == null) mFixedWidthMinor = new TypedValue();
172        return mFixedWidthMinor;
173    }
174
175    public TypedValue getFixedHeightMajor() {
176        if (mFixedHeightMajor == null) mFixedHeightMajor = new TypedValue();
177        return mFixedHeightMajor;
178    }
179
180    public TypedValue getFixedHeightMinor() {
181        if (mFixedHeightMinor == null) mFixedHeightMinor = new TypedValue();
182        return mFixedHeightMinor;
183    }
184}
185