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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.settings.widget;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.view.ViewDebug;
import android.widget.FrameLayout;
import com.android.internal.util.Preconditions;
import com.android.settings.R;
/**
* Container for two-dimensional chart, drawn with a combination of
* {@link ChartGridView}, {@link ChartNetworkSeriesView} and {@link ChartSweepView}
* children. The entire chart uses {@link ChartAxis} to map between raw values
* and screen coordinates.
*/
public class ChartView extends FrameLayout {
// TODO: extend something that supports two-dimensional scrolling
private static final int SWEEP_GRAVITY = Gravity.TOP | Gravity.START;
ChartAxis mHoriz;
ChartAxis mVert;
@ViewDebug.ExportedProperty
private int mOptimalWidth = -1;
private float mOptimalWidthWeight = 0;
private Rect mContent = new Rect();
public ChartView(Context context) {
this(context, null, 0);
}
public ChartView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public ChartView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
final TypedArray a = context.obtainStyledAttributes(
attrs, R.styleable.ChartView, defStyle, 0);
setOptimalWidth(a.getDimensionPixelSize(R.styleable.ChartView_optimalWidth, -1),
a.getFloat(R.styleable.ChartView_optimalWidthWeight, 0));
a.recycle();
setClipToPadding(false);
setClipChildren(false);
}
void init(ChartAxis horiz, ChartAxis vert) {
mHoriz = Preconditions.checkNotNull(horiz, "missing horiz");
mVert = Preconditions.checkNotNull(vert, "missing vert");
}
public void setOptimalWidth(int optimalWidth, float optimalWidthWeight) {
mOptimalWidth = optimalWidth;
mOptimalWidthWeight = optimalWidthWeight;
requestLayout();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
final int slack = getMeasuredWidth() - mOptimalWidth;
if (mOptimalWidth > 0 && slack > 0) {
final int targetWidth = (int) (mOptimalWidth + (slack * mOptimalWidthWeight));
widthMeasureSpec = MeasureSpec.makeMeasureSpec(targetWidth, MeasureSpec.EXACTLY);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
mContent.set(getPaddingLeft(), getPaddingTop(), r - l - getPaddingRight(),
b - t - getPaddingBottom());
final int width = mContent.width();
final int height = mContent.height();
// no scrolling yet, so tell dimensions to fill exactly
mHoriz.setSize(width);
mVert.setSize(height);
final Rect parentRect = new Rect();
final Rect childRect = new Rect();
for (int i = 0; i < getChildCount(); i++) {
final View child = getChildAt(i);
final LayoutParams params = (LayoutParams) child.getLayoutParams();
parentRect.set(mContent);
if (child instanceof ChartNetworkSeriesView) {
// series are always laid out to fill entire graph area
// TODO: handle scrolling for series larger than content area
Gravity.apply(params.gravity, width, height, parentRect, childRect);
child.layout(childRect.left, childRect.top, childRect.right, childRect.bottom);
} else if (child instanceof ChartGridView) {
// Grid uses some extra room for labels
Gravity.apply(params.gravity, width, height, parentRect, childRect);
child.layout(childRect.left, childRect.top, childRect.right,
childRect.bottom + child.getPaddingBottom());
} else if (child instanceof ChartSweepView) {
layoutSweep((ChartSweepView) child, parentRect, childRect);
child.layout(childRect.left, childRect.top, childRect.right, childRect.bottom);
}
}
}
protected void layoutSweep(ChartSweepView sweep) {
final Rect parentRect = new Rect(mContent);
final Rect childRect = new Rect();
layoutSweep(sweep, parentRect, childRect);
sweep.layout(childRect.left, childRect.top, childRect.right, childRect.bottom);
}
protected void layoutSweep(ChartSweepView sweep, Rect parentRect, Rect childRect) {
final Rect sweepMargins = sweep.getMargins();
// sweep is always placed along specific dimension
if (sweep.getFollowAxis() == ChartSweepView.VERTICAL) {
parentRect.top += sweepMargins.top + (int) sweep.getPoint();
parentRect.bottom = parentRect.top;
parentRect.left += sweepMargins.left;
parentRect.right += sweepMargins.right;
Gravity.apply(SWEEP_GRAVITY, parentRect.width(), sweep.getMeasuredHeight(),
parentRect, childRect);
} else {
parentRect.left += sweepMargins.left + (int) sweep.getPoint();
parentRect.right = parentRect.left;
parentRect.top += sweepMargins.top;
parentRect.bottom += sweepMargins.bottom;
Gravity.apply(SWEEP_GRAVITY, sweep.getMeasuredWidth(), parentRect.height(),
parentRect, childRect);
}
}
}
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