DayPickerViewPager.java revision 78bf1d329a4c0210394f846be1fd1390314aefc0 
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.widget;
18
19import com.android.internal.widget.ViewPager;
20
21import android.content.Context;
22import android.graphics.drawable.Drawable;
23import android.util.AttributeSet;
24import android.view.View;
25
26import java.util.ArrayList;
27
28/**
29 * This displays a list of months in a calendar format with selectable days.
30 */
31class DayPickerViewPager extends ViewPager {
32    private final ArrayList<View> mMatchParentChildren = new ArrayList<>(1);
33
34    public DayPickerViewPager(Context context) {
35        this(context, null);
36    }
37
38    public DayPickerViewPager(Context context, AttributeSet attrs) {
39        this(context, attrs, 0);
40    }
41
42    public DayPickerViewPager(Context context, AttributeSet attrs, int defStyleAttr) {
43        this(context, attrs, defStyleAttr, 0);
44    }
45
46    public DayPickerViewPager(Context context, AttributeSet attrs, int defStyleAttr,
47            int defStyleRes) {
48        super(context, attrs, defStyleAttr, defStyleRes);
49    }
50
51    @Override
52    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
53        populate();
54
55        // Everything below is mostly copied from FrameLayout.
56        int count = getChildCount();
57
58        final boolean measureMatchParentChildren =
59                MeasureSpec.getMode(widthMeasureSpec) != MeasureSpec.EXACTLY ||
60                        MeasureSpec.getMode(heightMeasureSpec) != MeasureSpec.EXACTLY;
61
62        int maxHeight = 0;
63        int maxWidth = 0;
64        int childState = 0;
65
66        for (int i = 0; i < count; i++) {
67            final View child = getChildAt(i);
68            if (child.getVisibility() != GONE) {
69                measureChild(child, widthMeasureSpec, heightMeasureSpec);
70                final LayoutParams lp = (LayoutParams) child.getLayoutParams();
71                maxWidth = Math.max(maxWidth, child.getMeasuredWidth());
72                maxHeight = Math.max(maxHeight, child.getMeasuredHeight());
73                childState = combineMeasuredStates(childState, child.getMeasuredState());
74                if (measureMatchParentChildren) {
75                    if (lp.width == LayoutParams.MATCH_PARENT ||
76                            lp.height == LayoutParams.MATCH_PARENT) {
77                        mMatchParentChildren.add(child);
78                    }
79                }
80            }
81        }
82
83        // Account for padding too
84        maxWidth += getPaddingLeft() + getPaddingRight();
85        maxHeight += getPaddingTop() + getPaddingBottom();
86
87        // Check against our minimum height and width
88        maxHeight = Math.max(maxHeight, getSuggestedMinimumHeight());
89        maxWidth = Math.max(maxWidth, getSuggestedMinimumWidth());
90
91        // Check against our foreground's minimum height and width
92        final Drawable drawable = getForeground();
93        if (drawable != null) {
94            maxHeight = Math.max(maxHeight, drawable.getMinimumHeight());
95            maxWidth = Math.max(maxWidth, drawable.getMinimumWidth());
96        }
97
98        setMeasuredDimension(resolveSizeAndState(maxWidth, widthMeasureSpec, childState),
99                resolveSizeAndState(maxHeight, heightMeasureSpec,
100                        childState << MEASURED_HEIGHT_STATE_SHIFT));
101
102        count = mMatchParentChildren.size();
103        if (count > 1) {
104            for (int i = 0; i < count; i++) {
105                final View child = mMatchParentChildren.get(i);
106
107                final LayoutParams lp = (LayoutParams) child.getLayoutParams();
108                final int childWidthMeasureSpec;
109                final int childHeightMeasureSpec;
110
111                if (lp.width == LayoutParams.MATCH_PARENT) {
112                    childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(
113                            getMeasuredWidth() - getPaddingLeft() - getPaddingRight(),
114                            MeasureSpec.EXACTLY);
115                } else {
116                    childWidthMeasureSpec = getChildMeasureSpec(widthMeasureSpec,
117                            getPaddingLeft() + getPaddingRight(),
118                            lp.width);
119                }
120
121                if (lp.height == LayoutParams.MATCH_PARENT) {
122                    childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(
123                            getMeasuredHeight() - getPaddingTop() - getPaddingBottom(),
124                            MeasureSpec.EXACTLY);
125                } else {
126                    childHeightMeasureSpec = getChildMeasureSpec(heightMeasureSpec,
127                            getPaddingTop() + getPaddingBottom(),
128                            lp.height);
129                }
130
131                child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
132            }
133        }
134
135        mMatchParentChildren.clear();
136    }
137}
138