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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 static com.android.settings.DataUsageSummary.formatDateRange;
import android.content.Context;
import android.content.res.ColorStateList;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.drawable.Drawable;
import android.text.Layout;
import android.text.StaticLayout;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.view.View;
import com.android.internal.util.Preconditions;
import com.android.settings.R;
/**
* Background of {@link ChartView} that renders grid lines as requested by
* {@link ChartAxis#getTickPoints()}.
*/
public class ChartGridView extends View {
private ChartAxis mHoriz;
private ChartAxis mVert;
private Drawable mPrimary;
private Drawable mSecondary;
private Drawable mBorder;
private int mLabelSize;
private int mLabelColor;
private Layout mLabelStart;
private Layout mLabelMid;
private Layout mLabelEnd;
public ChartGridView(Context context) {
this(context, null, 0);
}
public ChartGridView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public ChartGridView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
setWillNotDraw(false);
final TypedArray a = context.obtainStyledAttributes(
attrs, R.styleable.ChartGridView, defStyle, 0);
mPrimary = a.getDrawable(R.styleable.ChartGridView_primaryDrawable);
mSecondary = a.getDrawable(R.styleable.ChartGridView_secondaryDrawable);
mBorder = a.getDrawable(R.styleable.ChartGridView_borderDrawable);
final int taId = a.getResourceId(R.styleable.ChartGridView_android_textAppearance, -1);
final TypedArray ta = context.obtainStyledAttributes(taId,
com.android.internal.R.styleable.TextAppearance);
mLabelSize = ta.getDimensionPixelSize(
com.android.internal.R.styleable.TextAppearance_textSize, 0);
ta.recycle();
final ColorStateList labelColor = a.getColorStateList(
R.styleable.ChartGridView_android_textColor);
mLabelColor = labelColor.getDefaultColor();
a.recycle();
}
void init(ChartAxis horiz, ChartAxis vert) {
mHoriz = Preconditions.checkNotNull(horiz, "missing horiz");
mVert = Preconditions.checkNotNull(vert, "missing vert");
}
void setBounds(long start, long end) {
final Context context = getContext();
final long mid = (start + end) / 2;
mLabelStart = makeLabel(formatDateRange(context, start, start));
mLabelMid = makeLabel(formatDateRange(context, mid, mid));
mLabelEnd = makeLabel(formatDateRange(context, end, end));
invalidate();
}
@Override
protected void onDraw(Canvas canvas) {
final int width = getWidth();
final int height = getHeight() - getPaddingBottom();
final Drawable secondary = mSecondary;
if (secondary != null) {
final int secondaryHeight = secondary.getIntrinsicHeight();
final float[] vertTicks = mVert.getTickPoints();
for (float y : vertTicks) {
final int bottom = (int) Math.min(y + secondaryHeight, height);
secondary.setBounds(0, (int) y, width, bottom);
secondary.draw(canvas);
}
}
final Drawable primary = mPrimary;
if (primary != null) {
final int primaryWidth = primary.getIntrinsicWidth();
final int primaryHeight = primary.getIntrinsicHeight();
final float[] horizTicks = mHoriz.getTickPoints();
for (float x : horizTicks) {
final int right = (int) Math.min(x + primaryWidth, width);
primary.setBounds((int) x, 0, right, height);
primary.draw(canvas);
}
}
mBorder.setBounds(0, 0, width, height);
mBorder.draw(canvas);
final int padding = mLabelStart != null ? mLabelStart.getHeight() / 8 : 0;
final Layout start = mLabelStart;
if (start != null) {
final int saveCount = canvas.save();
canvas.translate(0, height + padding);
start.draw(canvas);
canvas.restoreToCount(saveCount);
}
final Layout mid = mLabelMid;
if (mid != null) {
final int saveCount = canvas.save();
canvas.translate((width - mid.getWidth()) / 2, height + padding);
mid.draw(canvas);
canvas.restoreToCount(saveCount);
}
final Layout end = mLabelEnd;
if (end != null) {
final int saveCount = canvas.save();
canvas.translate(width - end.getWidth(), height + padding);
end.draw(canvas);
canvas.restoreToCount(saveCount);
}
}
private Layout makeLabel(CharSequence text) {
final Resources res = getResources();
final TextPaint paint = new TextPaint(Paint.ANTI_ALIAS_FLAG);
paint.density = res.getDisplayMetrics().density;
paint.setCompatibilityScaling(res.getCompatibilityInfo().applicationScale);
paint.setColor(mLabelColor);
paint.setTextSize(mLabelSize);
return new StaticLayout(text, paint,
(int) Math.ceil(Layout.getDesiredWidth(text, paint)),
Layout.Alignment.ALIGN_NORMAL, 1.f, 0, true);
}
}
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