Add third_party/android_data_chart for data chart widget.

third_party/android_snippets/java/src/org/chromium/third_party/android/datausagechart/ChartNetworkSeriesView.java

Index: third_party/android_snippets/java/src/org/chromium/third_party/android/datausagechart/ChartNetworkSeriesView.java
diff --git a/third_party/android_snippets/java/src/org/chromium/third_party/android/datausagechart/ChartNetworkSeriesView.java b/third_party/android_snippets/java/src/org/chromium/third_party/android/datausagechart/ChartNetworkSeriesView.java
new file mode 100644
index 0000000000000000000000000000000000000000..5192455344aaf8ed69002e54206d06933b04cb7d
--- /dev/null
+++ b/third_party/android_snippets/java/src/org/chromium/third_party/android/datausagechart/ChartNetworkSeriesView.java
@@ -0,0 +1,314 @@
+/*
+ * Copyright (C) 2013 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 org.chromium.third_party.android.datausagechart;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.DashPathEffect;
+import android.graphics.Paint;
+import android.graphics.Paint.Style;
+import android.graphics.Path;
+import android.graphics.RectF;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.View;
+
+import org.chromium.third_party.android.R;
+
+/**
+ * {@link NetworkStatsHistory} series to render inside a {@link ChartView},
+ * using {@link ChartAxis} to map into screen coordinates.
+ * This is derived from com.android.settings.widget.ChartNetworkSeriesView.
+ */
+public class ChartNetworkSeriesView extends View {
+    private static final String TAG = "ChartNetworkSeriesView";
+    private static final boolean LOGD = false;
+
+    private ChartAxis mHoriz;
+    private ChartAxis mVert;
+
+    private Paint mPaintStroke;
+    private Paint mPaintFill;
+    private Paint mPaintFillSecondary;
+    private Paint mPaintEstimate;
+
+    private NetworkStatsHistory mStats;
+
+    private Path mPathStroke;
+    private Path mPathFill;
+    private Path mPathEstimate;
+
+    private long mStart;
+    private long mEnd;
+
+    private long mPrimaryLeft;
+    private long mPrimaryRight;
+
+    /** Series will be extended to reach this end time. */
+    private long mEndTime = Long.MIN_VALUE;
+
+    private boolean mPathValid = false;
+    private boolean mEstimateVisible = false;
+
+    private long mMax;
+    private long mMaxEstimate;
+
+    public ChartNetworkSeriesView(Context context) {
+        this(context, null, 0);
+    }
+
+    public ChartNetworkSeriesView(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public ChartNetworkSeriesView(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+
+        final TypedArray a = context.obtainStyledAttributes(
+                attrs, R.styleable.ChartNetworkSeriesView, defStyle, 0);
+
+        final int stroke = a.getColor(R.styleable.ChartNetworkSeriesView_strokeColor, Color.RED);
+        final int fill = a.getColor(R.styleable.ChartNetworkSeriesView_fillColor, Color.RED);
+        final int fillSecondary = a.getColor(
+                R.styleable.ChartNetworkSeriesView_fillColorSecondary, Color.RED);
+
+        setChartColor(stroke, fill, fillSecondary);
+        setWillNotDraw(false);
+
+        a.recycle();
+
+        mPathStroke = new Path();
+        mPathFill = new Path();
+        mPathEstimate = new Path();
+    }
+
+    void init(ChartAxis horiz, ChartAxis vert) {
+        if (horiz == null) throw new NullPointerException("missing horiz");
+        if (vert == null) throw new NullPointerException("missing vert");
+        mHoriz = horiz;
+        mVert = vert;
+    }
+
+    public void setChartColor(int stroke, int fill, int fillSecondary) {
+        mPaintStroke = new Paint();
+        mPaintStroke.setStrokeWidth(4.0f * getResources().getDisplayMetrics().density);
+        mPaintStroke.setColor(stroke);
+        mPaintStroke.setStyle(Style.STROKE);
+        mPaintStroke.setAntiAlias(true);
+
+        mPaintFill = new Paint();
+        mPaintFill.setColor(fill);
+        mPaintFill.setStyle(Style.FILL);
+        mPaintFill.setAntiAlias(true);
+
+        mPaintFillSecondary = new Paint();
+        mPaintFillSecondary.setColor(fillSecondary);
+        mPaintFillSecondary.setStyle(Style.FILL);
+        mPaintFillSecondary.setAntiAlias(true);
+
+        mPaintEstimate = new Paint();
+        mPaintEstimate.setStrokeWidth(3.0f);
+        mPaintEstimate.setColor(fillSecondary);
+        mPaintEstimate.setStyle(Style.STROKE);
+        mPaintEstimate.setAntiAlias(true);
+        mPaintEstimate.setPathEffect(new DashPathEffect(new float[] { 10, 10 }, 1));
+    }
+
+    public void bindNetworkStats(NetworkStatsHistory stats) {
+        mStats = stats;
+        invalidatePath();
+        invalidate();
+    }
+
+    public void setBounds(long start, long end) {
+        mStart = start;
+        mEnd = end;
+    }
+
+    /**
+     * Set the range to paint with {@link #mPaintFill}, leaving the remaining
+     * area to be painted with {@link #mPaintFillSecondary}.
+     */
+    public void setPrimaryRange(long left, long right) {
+        mPrimaryLeft = left;
+        mPrimaryRight = right;
+        invalidate();
+    }
+
+    public void invalidatePath() {
+        mPathValid = false;
+        mMax = 0;
+        invalidate();
+    }
+
+    /**
+     * Erase any existing {@link Path} and generate series outline based on
+     * currently bound {@link NetworkStatsHistory} data.
+     */
+    private void generatePath() {
+        if (LOGD) Log.d(TAG, "generatePath()");
+
+        mMax = 0;
+        mPathStroke.reset();
+        mPathFill.reset();
+        mPathEstimate.reset();
+        mPathValid = true;
+
+        // bail when not enough stats to render
+        if (mStats == null || mStats.size() < 2) {
+            return;
+        }
+
+        final int height = getHeight();
+
+        boolean started = false;
+        float lastX = 0;
+        float lastY = height;
+        long lastTime = mHoriz.convertToValue(lastX);
+
+        // move into starting position
+        mPathStroke.moveTo(lastX, lastY);
+        mPathFill.moveTo(lastX, lastY);
+
+        // TODO: count fractional data from first bucket crossing start;
+        // currently it only accepts first full bucket.
+
+        long totalData = 0;
+
+        NetworkStatsHistory.Entry entry = null;
+
+        final int start = mStats.getIndexBefore(mStart);
+        final int end = mStats.getIndexAfter(mEnd);
+        for (int i = start; i <= end; i++) {
+            entry = mStats.getValues(i, entry);
+
+            final long startTime = entry.bucketStart;
+            final long endTime = startTime + entry.bucketDuration;
+
+            final float startX = mHoriz.convertToPoint(startTime);
+            final float endX = mHoriz.convertToPoint(endTime);
+
+            // skip until we find first stats on screen
+            if (endX < 0) continue;
+
+            // increment by current bucket total
+            totalData += entry.rxBytes + entry.txBytes;
+
+            final float startY = lastY;
+            final float endY = mVert.convertToPoint(totalData);
+
+            if (lastTime != startTime) {
+                // gap in buckets; line to start of current bucket
+                mPathStroke.lineTo(startX, startY);
+                mPathFill.lineTo(startX, startY);
+            }
+
+            // always draw to end of current bucket
+            mPathStroke.lineTo(endX, endY);
+            mPathFill.lineTo(endX, endY);
+
+            lastX = endX;
+            lastY = endY;
+            lastTime = endTime;
+        }
+
+        // when data falls short, extend to requested end time
+        if (lastTime < mEndTime) {
+            lastX = mHoriz.convertToPoint(mEndTime);
+
+            mPathStroke.lineTo(lastX, lastY);
+            mPathFill.lineTo(lastX, lastY);
+        }
+
+        if (LOGD) {
+            final RectF bounds = new RectF();
+            mPathFill.computeBounds(bounds, true);
+            Log.d(TAG, "onLayout() rendered with bounds=" + bounds.toString() + " and totalData="
+                    + totalData);
+        }
+
+        // drop to bottom of graph from current location
+        mPathFill.lineTo(lastX, height);
+        mPathFill.lineTo(0, height);
+
+        mMax = totalData;
+
+        invalidate();
+    }
+
+    public void setEndTime(long endTime) {
+        mEndTime = endTime;
+    }
+
+    public void setEstimateVisible(boolean estimateVisible) {
+        mEstimateVisible = false;
+        invalidate();
+    }
+
+    public long getMaxEstimate() {
+        return mMaxEstimate;
+    }
+
+    public long getMaxVisible() {
+        final long maxVisible = mEstimateVisible ? mMaxEstimate : mMax;
+        if (maxVisible <= 0 && mStats != null) {
+            // haven't generated path yet; fall back to raw data
+            final NetworkStatsHistory.Entry entry = mStats.getValues(mStart, mEnd, null);
+            return entry.rxBytes + entry.txBytes;
+        } else {
+            return maxVisible;
+        }
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        int save;
+
+        if (!mPathValid) {
+            generatePath();
+        }
+
+        final float primaryLeftPoint = mHoriz.convertToPoint(mPrimaryLeft);
+        final float primaryRightPoint = mHoriz.convertToPoint(mPrimaryRight);
+
+        if (mEstimateVisible) {
+            save = canvas.save();
+            canvas.clipRect(0, 0, getWidth(), getHeight());
+            canvas.drawPath(mPathEstimate, mPaintEstimate);
+            canvas.restoreToCount(save);
+        }
+
+        save = canvas.save();
+        canvas.clipRect(0, 0, primaryLeftPoint, getHeight());
+        canvas.drawPath(mPathFill, mPaintFillSecondary);
+        canvas.restoreToCount(save);
+
+        save = canvas.save();
+        canvas.clipRect(primaryRightPoint, 0, getWidth(), getHeight());
+        canvas.drawPath(mPathFill, mPaintFillSecondary);
+        canvas.restoreToCount(save);
+
+        save = canvas.save();
+        canvas.clipRect(primaryLeftPoint, 0, primaryRightPoint, getHeight());
+        canvas.drawPath(mPathFill, mPaintFill);
+        canvas.drawPath(mPathStroke, mPaintStroke);
+        canvas.restoreToCount(save);
+
+    }
+}