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/*
* Copyright (C) 2010 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.deviceinfo;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;
import com.android.settings.R;
import java.util.Collection;
/**
* Draws a horizontal bar chart with colored slices, each represented by
* {@link Entry}.
*/
public class PercentageBarChart extends View {
private final Paint mEmptyPaint = new Paint();
private Collection<Entry> mEntries;
private int mMinTickWidth = 1;
public static class Entry implements Comparable<Entry> {
public final int order;
public final float percentage;
public final Paint paint;
protected Entry(int order, float percentage, Paint paint) {
this.order = order;
this.percentage = percentage;
this.paint = paint;
}
@Override
public int compareTo(Entry another) {
return order - another.order;
}
}
public PercentageBarChart(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.PercentageBarChart);
mMinTickWidth = a.getDimensionPixelSize(R.styleable.PercentageBarChart_minTickWidth, 1);
int emptyColor = a.getColor(R.styleable.PercentageBarChart_emptyColor, Color.BLACK);
a.recycle();
mEmptyPaint.setColor(emptyColor);
mEmptyPaint.setStyle(Paint.Style.FILL);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
final int left = getPaddingLeft();
final int right = getWidth() - getPaddingRight();
final int top = getPaddingTop();
final int bottom = getHeight() - getPaddingBottom();
final int width = right - left;
final boolean isLayoutRtl = isLayoutRtl();
if (isLayoutRtl) {
float nextX = right;
if (mEntries != null) {
for (final Entry e : mEntries) {
final float entryWidth;
if (e.percentage == 0.0f) {
entryWidth = 0.0f;
} else {
entryWidth = Math.max(mMinTickWidth, width * e.percentage);
}
final float lastX = nextX - entryWidth;
if (lastX < left) {
canvas.drawRect(left, top, nextX, bottom, e.paint);
return;
}
canvas.drawRect(lastX, top, nextX, bottom, e.paint);
nextX = lastX;
}
}
canvas.drawRect(left, top, nextX, bottom, mEmptyPaint);
} else {
float lastX = left;
if (mEntries != null) {
for (final Entry e : mEntries) {
final float entryWidth;
if (e.percentage == 0.0f) {
entryWidth = 0.0f;
} else {
entryWidth = Math.max(mMinTickWidth, width * e.percentage);
}
final float nextX = lastX + entryWidth;
if (nextX > right) {
canvas.drawRect(lastX, top, right, bottom, e.paint);
return;
}
canvas.drawRect(lastX, top, nextX, bottom, e.paint);
lastX = nextX;
}
}
canvas.drawRect(lastX, top, right, bottom, mEmptyPaint);
}
}
/**
* Sets the background for this chart. Callers are responsible for later
* calling {@link #invalidate()}.
*/
@Override
public void setBackgroundColor(int color) {
mEmptyPaint.setColor(color);
}
/**
* Adds a new slice to the percentage bar chart. Callers are responsible for
* later calling {@link #invalidate()}.
*
* @param percentage the total width that
* @param color the color to draw the entry
*/
public static Entry createEntry(int order, float percentage, int color) {
final Paint p = new Paint();
p.setColor(color);
p.setStyle(Paint.Style.FILL);
return new Entry(order, percentage, p);
}
public void setEntries(Collection<Entry> entries) {
mEntries = entries;
}
}
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