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 com.android.settings.dashboard;
18
19import android.content.Context;
20import android.content.res.Resources;
21import android.util.AttributeSet;
22import android.view.View;
23import android.view.ViewGroup;
24import com.android.settings.R;
25
26public class DashboardContainerView extends ViewGroup {
27
28    private float mCellGapX;
29    private float mCellGapY;
30
31    private int mNumRows;
32    private int mNumColumns;
33
34    public DashboardContainerView(Context context, AttributeSet attrs) {
35        super(context, attrs);
36
37        final Resources res = context.getResources();
38        mCellGapX = res.getDimension(R.dimen.dashboard_cell_gap_x);
39        mCellGapY = res.getDimension(R.dimen.dashboard_cell_gap_y);
40        mNumColumns = res.getInteger(R.integer.dashboard_num_columns);
41    }
42
43    @Override
44    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
45        final int width = MeasureSpec.getSize(widthMeasureSpec);
46        final int availableWidth = (int) (width - getPaddingLeft() - getPaddingRight() -
47                (mNumColumns - 1) * mCellGapX);
48        float cellWidth = (float) Math.ceil(((float) availableWidth) / mNumColumns);
49        final int N = getChildCount();
50
51        int cellHeight = 0;
52        int cursor = 0;
53
54        for (int i = 0; i < N; ++i) {
55            DashboardTileView v = (DashboardTileView) getChildAt(i);
56            if (v.getVisibility() == View.GONE) {
57                continue;
58            }
59
60            ViewGroup.LayoutParams lp = v.getLayoutParams();
61            int colSpan = v.getColumnSpan();
62            lp.width = (int) ((colSpan * cellWidth) + (colSpan - 1) * mCellGapX);
63
64            // Measure the child
65            int newWidthSpec = getChildMeasureSpec(widthMeasureSpec, 0, lp.width);
66            int newHeightSpec = getChildMeasureSpec(heightMeasureSpec, 0, lp.height);
67            v.measure(newWidthSpec, newHeightSpec);
68
69            // Save the cell height
70            if (cellHeight <= 0) {
71                cellHeight = v.getMeasuredHeight();
72            }
73
74            lp.height = cellHeight;
75
76            cursor += colSpan;
77        }
78
79        mNumRows = (int) Math.ceil((float) cursor / mNumColumns);
80        final int newHeight = (int) ((mNumRows * cellHeight) + ((mNumRows - 1) * mCellGapY)) +
81                getPaddingTop() + getPaddingBottom();
82
83        setMeasuredDimension(width, newHeight);
84    }
85
86    @Override
87    protected void onLayout(boolean changed, int l, int t, int r, int b) {
88        final int N = getChildCount();
89        final boolean isLayoutRtl = isLayoutRtl();
90        final int width = getWidth();
91
92        int x = getPaddingStart();
93        int y = getPaddingTop();
94        int cursor = 0;
95
96        for (int i = 0; i < N; ++i) {
97            final DashboardTileView child = (DashboardTileView) getChildAt(i);
98            final ViewGroup.LayoutParams lp = child.getLayoutParams();
99            if (child.getVisibility() == GONE) {
100                continue;
101            }
102
103            final int col = cursor % mNumColumns;
104            final int colSpan = child.getColumnSpan();
105
106            final int childWidth = lp.width;
107            final int childHeight = lp.height;
108
109            int row = cursor / mNumColumns;
110
111            if (row == mNumRows - 1) {
112                child.setDividerVisibility(false);
113            }
114
115            // Push the item to the next row if it can't fit on this one
116            if ((col + colSpan) > mNumColumns) {
117                x = getPaddingStart();
118                y += childHeight + mCellGapY;
119                row++;
120            }
121
122            final int childLeft = (isLayoutRtl) ? width - x - childWidth : x;
123            final int childRight = childLeft + childWidth;
124
125            final int childTop = y;
126            final int childBottom = childTop + childHeight;
127
128            // Layout the container
129            child.layout(childLeft, childTop, childRight, childBottom);
130
131            // Offset the position by the cell gap or reset the position and cursor when we
132            // reach the end of the row
133            cursor += child.getColumnSpan();
134            if (cursor < (((row + 1) * mNumColumns))) {
135                x += childWidth + mCellGapX;
136            } else {
137                x = getPaddingStart();
138                y += childHeight + mCellGapY;
139            }
140        }
141    }
142}
143