1/*
2 * Copyright (C) 2011 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.widget;
18
19import android.content.Context;
20import android.content.res.TypedArray;
21import android.graphics.Rect;
22import android.util.AttributeSet;
23import android.view.Gravity;
24import android.view.View;
25import android.view.ViewDebug;
26import android.widget.FrameLayout;
27
28import com.android.internal.util.Preconditions;
29import com.android.settings.R;
30
31/**
32 * Container for two-dimensional chart, drawn with a combination of
33 * {@link ChartGridView}, {@link ChartNetworkSeriesView} and {@link ChartSweepView}
34 * children. The entire chart uses {@link ChartAxis} to map between raw values
35 * and screen coordinates.
36 */
37public class ChartView extends FrameLayout {
38    // TODO: extend something that supports two-dimensional scrolling
39
40    private static final int SWEEP_GRAVITY = Gravity.TOP | Gravity.START;
41
42    ChartAxis mHoriz;
43    ChartAxis mVert;
44
45    @ViewDebug.ExportedProperty
46    private int mOptimalWidth = -1;
47    private float mOptimalWidthWeight = 0;
48
49    private Rect mContent = new Rect();
50
51    public ChartView(Context context) {
52        this(context, null, 0);
53    }
54
55    public ChartView(Context context, AttributeSet attrs) {
56        this(context, attrs, 0);
57    }
58
59    public ChartView(Context context, AttributeSet attrs, int defStyle) {
60        super(context, attrs, defStyle);
61
62        final TypedArray a = context.obtainStyledAttributes(
63                attrs, R.styleable.ChartView, defStyle, 0);
64        setOptimalWidth(a.getDimensionPixelSize(R.styleable.ChartView_optimalWidth, -1),
65                a.getFloat(R.styleable.ChartView_optimalWidthWeight, 0));
66        a.recycle();
67
68        setClipToPadding(false);
69        setClipChildren(false);
70    }
71
72    void init(ChartAxis horiz, ChartAxis vert) {
73        mHoriz = Preconditions.checkNotNull(horiz, "missing horiz");
74        mVert = Preconditions.checkNotNull(vert, "missing vert");
75    }
76
77    public void setOptimalWidth(int optimalWidth, float optimalWidthWeight) {
78        mOptimalWidth = optimalWidth;
79        mOptimalWidthWeight = optimalWidthWeight;
80        requestLayout();
81    }
82
83    @Override
84    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
85        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
86
87        final int slack = getMeasuredWidth() - mOptimalWidth;
88        if (mOptimalWidth > 0 && slack > 0) {
89            final int targetWidth = (int) (mOptimalWidth + (slack * mOptimalWidthWeight));
90            widthMeasureSpec = MeasureSpec.makeMeasureSpec(targetWidth, MeasureSpec.EXACTLY);
91            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
92        }
93    }
94
95    @Override
96    protected void onLayout(boolean changed, int l, int t, int r, int b) {
97        mContent.set(getPaddingLeft(), getPaddingTop(), r - l - getPaddingRight(),
98                b - t - getPaddingBottom());
99        final int width = mContent.width();
100        final int height = mContent.height();
101
102        // no scrolling yet, so tell dimensions to fill exactly
103        mHoriz.setSize(width);
104        mVert.setSize(height);
105
106        final Rect parentRect = new Rect();
107        final Rect childRect = new Rect();
108
109        for (int i = 0; i < getChildCount(); i++) {
110            final View child = getChildAt(i);
111            final LayoutParams params = (LayoutParams) child.getLayoutParams();
112
113            parentRect.set(mContent);
114
115            if (child instanceof ChartNetworkSeriesView) {
116                // series are always laid out to fill entire graph area
117                // TODO: handle scrolling for series larger than content area
118                Gravity.apply(params.gravity, width, height, parentRect, childRect);
119                child.layout(childRect.left, childRect.top, childRect.right, childRect.bottom);
120
121            } else if (child instanceof ChartGridView) {
122                // Grid uses some extra room for labels
123                Gravity.apply(params.gravity, width, height, parentRect, childRect);
124                child.layout(childRect.left, childRect.top, childRect.right,
125                        childRect.bottom + child.getPaddingBottom());
126
127            } else if (child instanceof ChartSweepView) {
128                layoutSweep((ChartSweepView) child, parentRect, childRect);
129                child.layout(childRect.left, childRect.top, childRect.right, childRect.bottom);
130            }
131        }
132    }
133
134    protected void layoutSweep(ChartSweepView sweep) {
135        final Rect parentRect = new Rect(mContent);
136        final Rect childRect = new Rect();
137
138        layoutSweep(sweep, parentRect, childRect);
139        sweep.layout(childRect.left, childRect.top, childRect.right, childRect.bottom);
140    }
141
142    protected void layoutSweep(ChartSweepView sweep, Rect parentRect, Rect childRect) {
143        final Rect sweepMargins = sweep.getMargins();
144
145        // sweep is always placed along specific dimension
146        if (sweep.getFollowAxis() == ChartSweepView.VERTICAL) {
147            parentRect.top += sweepMargins.top + (int) sweep.getPoint();
148            parentRect.bottom = parentRect.top;
149            parentRect.left += sweepMargins.left;
150            parentRect.right += sweepMargins.right;
151            Gravity.apply(SWEEP_GRAVITY, parentRect.width(), sweep.getMeasuredHeight(),
152                    parentRect, childRect);
153
154        } else {
155            parentRect.left += sweepMargins.left + (int) sweep.getPoint();
156            parentRect.right = parentRect.left;
157            parentRect.top += sweepMargins.top;
158            parentRect.bottom += sweepMargins.bottom;
159            Gravity.apply(SWEEP_GRAVITY, sweep.getMeasuredWidth(), parentRect.height(),
160                    parentRect, childRect);
161        }
162    }
163}
164