Add third_party/android_data_chart for data chart widget.

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

Index: third_party/android_snippets/java/src/org/chromium/third_party/android/datausagechart/ChartDataUsageView.java
diff --git a/third_party/android_snippets/java/src/org/chromium/third_party/android/datausagechart/ChartDataUsageView.java b/third_party/android_snippets/java/src/org/chromium/third_party/android/datausagechart/ChartDataUsageView.java
new file mode 100644
index 0000000000000000000000000000000000000000..b610a6097ba55c3bf0a2b6248d144a3453ad6204
--- /dev/null
+++ b/third_party/android_snippets/java/src/org/chromium/third_party/android/datausagechart/ChartDataUsageView.java
@@ -0,0 +1,494 @@
+/*
+ * 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 org.chromium.third_party.android.datausagechart;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.text.Spannable;
+import android.text.SpannableStringBuilder;
+import android.text.TextUtils;
+import android.text.format.DateUtils;
+import android.text.format.Time;
+import android.util.AttributeSet;
+import android.view.MotionEvent;
+import android.view.View;
+
+import org.chromium.third_party.android.R;
+
+import java.util.Arrays;
+import java.util.Calendar;
+import java.util.Locale;
+import java.util.TimeZone;
+
+/**
+ * Specific {@link ChartView} that displays {@link ChartNetworkSeriesView} for inspection ranges.
+ * This is derived from com.android.settings.widget.ChartDataUsageView.
+ */
+public class ChartDataUsageView extends ChartView {
+    public static final int DAYS_IN_CHART = 30;
+
+    private static final long MB_IN_BYTES = 1024 * 1024;
+    private static final long GB_IN_BYTES = 1024 * 1024 * 1024;
+
+    private ChartNetworkSeriesView mOriginalSeries;
+    private ChartNetworkSeriesView mCompressedSeries;
+
+    private NetworkStatsHistory mHistory;
+
+    private long mLeft;
+    private long mRight;
+
+    /** Current maximum value of {@link #mVert}. */
+    private long mVertMax;
+
+    /**
+     * Constructs a new {@link ChartDataUsageView} with the appropriate context.
+     */
+    public ChartDataUsageView(Context context) {
+        this(context, null, 0);
+    }
+
+    /**
+     * Constructs a new {@link ChartDataUsageView} with the appropriate context and attributes.
+     */
+    public ChartDataUsageView(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    /**
+     * Constructs a new {@link ChartDataUsageView} with the appropriate context, attributes, and
+     * style.
+     */
+    public ChartDataUsageView(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        init(new TimeAxis(), new InvertedChartAxis(new DataAxis()));
+    }
+
+    @Override
+    protected void onFinishInflate() {
+        super.onFinishInflate();
+
+        mOriginalSeries = (ChartNetworkSeriesView) findViewById(R.id.series);
+        mCompressedSeries = (ChartNetworkSeriesView) findViewById(R.id.detail_series);
+
+        // tell everyone about our axis
+        mOriginalSeries.init(mHoriz, mVert);
+        mCompressedSeries.init(mHoriz, mVert);
+        setActivated(false);
+    }
+
+    public void bindOriginalNetworkStats(NetworkStatsHistory stats) {
+        mOriginalSeries.bindNetworkStats(stats);
+        // Compensate for time zone adjustments when setting the end time.
+        mHistory = stats;
+        updateVertAxisBounds();
+        updateEstimateVisible();
+        updatePrimaryRange();
+        requestLayout();
+    }
+
+    public void bindCompressedNetworkStats(NetworkStatsHistory stats) {
+        mCompressedSeries.bindNetworkStats(stats);
+        mCompressedSeries.setVisibility(stats != null ? View.VISIBLE : View.GONE);
+        if (mHistory != null) {
+            // Compensate for time zone adjustments when setting the end time.
+            mOriginalSeries.setEndTime(mHistory.getEnd()
+                    - TimeZone.getDefault().getOffset(mHistory.getEnd()));
+            mCompressedSeries.setEndTime(mHistory.getEnd()
+                    - TimeZone.getDefault().getOffset(mHistory.getEnd()));
+        }
+        updateEstimateVisible();
+        updatePrimaryRange();
+        requestLayout();
+    }
+
+    /**
+     * Update {@link #mVert} to show data from {@link NetworkStatsHistory}.
+     */
+    private void updateVertAxisBounds() {
+        long newMax = 0;
+
+        // always show known data and policy lines
+        final long maxSeries = Math.max(mOriginalSeries.getMaxVisible(),
+                mCompressedSeries.getMaxVisible());
+        final long maxVisible = Math.max(maxSeries, 0) * 12 / 10;
+        final long maxDefault = Math.max(maxVisible, 1 * MB_IN_BYTES);
+        newMax = Math.max(maxDefault, newMax);
+
+        // only invalidate when vertMax actually changed
+        if (newMax != mVertMax) {
+            mVertMax = newMax;
+
+            final boolean changed = mVert.setBounds(0L, newMax);
+
+            if (changed) {
+                mOriginalSeries.invalidatePath();
+                mCompressedSeries.invalidatePath();
+            }
+        }
+    }
+
+    private void updateEstimateVisible() {
+        mOriginalSeries.setEstimateVisible(false);
+    }
+
+    @Override
+    public boolean onTouchEvent(MotionEvent event) {
+        if (isActivated()) return false;
+        switch (event.getAction()) {
+            case MotionEvent.ACTION_DOWN: {
+                return true;
+            }
+            case MotionEvent.ACTION_UP: {
+                setActivated(true);
+                return true;
+            }
+            default: {
+                return false;
+            }
+        }
+    }
+
+    public long getInspectStart() {
+        return mLeft;
+    }
+
+    public long getInspectEnd() {
+        return mRight;
+    }
+
+    /**
+     * Set the exact time range that should be displayed, updating how
+     * {@link ChartNetworkSeriesView} paints. Moves inspection ranges to be the
+     * last "week" of available data, without triggering listener events.
+     */
+    public void setVisibleRange(long visibleStart, long visibleEnd, long start,
+            long end) {
+        long timeZoneOffset = TimeZone.getDefault().getOffset(end);
+        final boolean changed = mHoriz.setBounds(visibleStart, visibleEnd);
+        mOriginalSeries.setBounds(visibleStart, visibleEnd);
+        mCompressedSeries.setBounds(visibleStart, visibleEnd);
+
+        final long validEnd = visibleEnd;
+
+        long max = validEnd;
+        long min = Math.max(
+                visibleStart, (max - DateUtils.DAY_IN_MILLIS * DAYS_IN_CHART));
+        if (visibleEnd - DateUtils.HOUR_IN_MILLIS
+                - DateUtils.DAY_IN_MILLIS * DAYS_IN_CHART != start
+                || visibleEnd != end + timeZoneOffset) {
+            min = start;
+            max = end;
+            setActivated(true);
+        }
+
+        mLeft = min;
+        mRight = max;
+
+        requestLayout();
+        if (changed) {
+            mOriginalSeries.invalidatePath();
+            mCompressedSeries.invalidatePath();
+        }
+
+        updateVertAxisBounds();
+        updateEstimateVisible();
+        updatePrimaryRange();
+    }
+
+    private void updatePrimaryRange() {
+        final long left = mLeft;
+        final long right = mRight;
+
+        // prefer showing primary range on detail series, when available
+        if (mCompressedSeries.getVisibility() == View.VISIBLE) {
+            mCompressedSeries.setPrimaryRange(left, right);
+            // Overlay the compressed series, when available, on top of the series.
+            mOriginalSeries.setPrimaryRange(left, right);
+        } else {
+            mOriginalSeries.setPrimaryRange(left, right);
+        }
+    }
+
+    /**
+     * A chart axis that represents time.
+     */
+    public static class TimeAxis implements ChartAxis {
+        private static final int FIRST_DAY_OF_WEEK = Calendar.getInstance().getFirstDayOfWeek() - 1;
+
+        private long mMin;
+        private long mMax;
+        private float mSize;
+
+        public TimeAxis() {
+            final long currentTime = System.currentTimeMillis();
+            setBounds(currentTime - DateUtils.DAY_IN_MILLIS * DAYS_IN_CHART, currentTime);
+        }
+
+        /**
+         * Generates a hash code for multiple values. The hash code is generated by
+         * calling {@link Arrays#hashCode(Object[])}.
+         *
+         * <p>This is useful for implementing {@link Object#hashCode()}. For example,
+         * in an object that has three properties, {@code x}, {@code y}, and
+         * {@code z}, one could write:
+         * <pre>
+         * public int hashCode() {
+         *   return Objects.hashCode(getX(), getY(), getZ());
+         * }</pre>
+         *
+         * <b>Warning</b>: When a single object is supplied, the returned hash code
+         * does not equal the hash code of that object.
+         */
+        public int objectsHashCode(Object... objects) {
+            return Arrays.hashCode(objects);
+        }
+
+        @Override
+        public int hashCode() {
+            return objectsHashCode(mMin, mMax, mSize);
+        }
+
+        @Override
+        public boolean setBounds(long min, long max) {
+            if (mMin != min || mMax != max) {
+                mMin = min;
+                mMax = max;
+                return true;
+            } else {
+                return false;
+            }
+        }
+
+        @Override
+        public boolean setSize(float size) {
+            if (mSize != size) {
+                mSize = size;
+                return true;
+            } else {
+                return false;
+            }
+        }
+
+        @Override
+        public float convertToPoint(long value) {
+            return (mSize * (value - mMin)) / (mMax - mMin);
+        }
+
+        @Override
+        public long convertToValue(float point) {
+            return (long) (mMin + ((point * (mMax - mMin)) / mSize));
+        }
+
+        @Override
+        public long buildLabel(Resources res, SpannableStringBuilder builder, long value) {
+            // TODO: convert to better string
+            builder.replace(0, builder.length(), Long.toString(value));
+            return value;
+        }
+
+        @Override
+        public float[] getTickPoints() {
+            final float[] ticks = new float[32];
+            int i = 0;
+
+            // tick mark for first day of each week
+            final Time time = new Time();
+            time.set(mMax);
+            time.monthDay -= time.weekDay - FIRST_DAY_OF_WEEK;
+            time.hour = time.minute = time.second = 0;
+
+            time.normalize(true);
+            long timeMillis = time.toMillis(true);
+            while (timeMillis > mMin) {
+                if (timeMillis <= mMax) {
+                    ticks[i++] = convertToPoint(timeMillis);
+                }
+                time.monthDay -= 7;
+                time.normalize(true);
+                timeMillis = time.toMillis(true);
+            }
+
+            return Arrays.copyOf(ticks, i);
+        }
+
+        @Override
+        public int shouldAdjustAxis(long value) {
+            // time axis never adjusts
+            return 0;
+        }
+    }
+
+    /**
+     * A chart axis that represents aggregate transmitted data.
+     */
+    public static class DataAxis implements ChartAxis {
+        private long mMin;
+        private long mMax;
+        private float mSize;
+
+        private static final boolean LOG_SCALE = false;
+
+        public int objectsHashCode(Object... objects) {
+            return Arrays.hashCode(objects);
+        }
+
+        @Override
+        public int hashCode() {
+            return objectsHashCode(mMin, mMax, mSize);
+        }
+
+        @Override
+        public boolean setBounds(long min, long max) {
+            if (mMin != min || mMax != max) {
+                mMin = min;
+                mMax = max;
+                return true;
+            } else {
+                return false;
+            }
+        }
+
+        @Override
+        public boolean setSize(float size) {
+            if (mSize != size) {
+                mSize = size;
+                return true;
+            } else {
+                return false;
+            }
+        }
+
+        @Override
+        public float convertToPoint(long value) {
+            if (LOG_SCALE) {
+                // derived polynomial fit to make lower values more visible
+                final double normalized = ((double) value - mMin) / (mMax - mMin);
+                final double fraction = Math.pow(10,
+                        0.36884343106175121463 * Math.log10(normalized) + -0.04328199452018252624);
+                return (float) (fraction * mSize);
+            } else {
+                return (mSize * (value - mMin)) / (mMax - mMin);
+            }
+        }
+
+        @Override
+        public long convertToValue(float point) {
+            if (LOG_SCALE) {
+                final double normalized = point / mSize;
+                final double fraction = 1.3102228476089056629
+                        * Math.pow(normalized, 2.7111774693164631640);
+                return (long) (mMin + (fraction * (mMax - mMin)));
+            } else {
+                return (long) (mMin + ((point * (mMax - mMin)) / mSize));
+            }
+        }
+
+        private static final Object sSpanSize = new Object();
+        private static final Object sSpanUnit = new Object();
+
+        @Override
+        public long buildLabel(Resources res, SpannableStringBuilder builder, long value) {
+
+            final CharSequence unit;
+            final long unitFactor;
+            if (value < 1000 * MB_IN_BYTES) {
+                unit = "MB";  // TODO: res.getText(R.string.origin_settings_storage_mbytes);
+                unitFactor = MB_IN_BYTES;
+            } else {
+                unit = "GB";  // TODO: res.getText(R.string.origin_settings_storage_gbytes);
+                unitFactor = GB_IN_BYTES;
+            }
+
+            final double result = (double) value / unitFactor;
+            final double resultRounded;
+            final CharSequence size;
+
+            if (result < 10) {
+                size = String.format(Locale.getDefault(), "%.1f", result);
+                resultRounded = (unitFactor * Math.round(result * 10)) / 10d;
+            } else {
+                size = String.format(Locale.getDefault(), "%.0f", result);
+                resultRounded = unitFactor * Math.round(result);
+            }
+
+            setText(builder, sSpanSize, size, "^1");
+            setText(builder, sSpanUnit, unit, "^2");
+
+            return (long) resultRounded;
+        }
+
+        @Override
+        public float[] getTickPoints() {
+            final long range = mMax - mMin;
+
+            // target about 16 ticks on screen, rounded to nearest power of 2
+            final long tickJump = roundUpToPowerOfTwo(range / 16);
+            final int tickCount = (int) (range / tickJump);
+            final float[] tickPoints = new float[tickCount];
+            long value = mMin;
+            for (int i = 0; i < tickPoints.length; i++) {
+                tickPoints[i] = convertToPoint(value);
+                value += tickJump;
+            }
+
+            return tickPoints;
+        }
+
+        @Override
+        public int shouldAdjustAxis(long value) {
+            final float point = convertToPoint(value);
+            if (point < mSize * 0.1) {
+                return -1;
+            } else if (point > mSize * 0.85) {
+                return 1;
+            } else {
+                return 0;
+            }
+        }
+    }
+
+    private static void setText(
+            SpannableStringBuilder builder, Object key, CharSequence text, String bootstrap) {
+        int start = builder.getSpanStart(key);
+        int end = builder.getSpanEnd(key);
+        if (start == -1) {
+            start = TextUtils.indexOf(builder, bootstrap);
+            end = start + bootstrap.length();
+            builder.setSpan(key, start, end, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
+        }
+        builder.replace(start, end, text);
+    }
+
+    private static long roundUpToPowerOfTwo(long i) {
+        // NOTE: borrowed from Hashtable.roundUpToPowerOfTwo()
+
+        i--; // If input is a power of two, shift its high-order bit right
+
+        // "Smear" the high-order bit all the way to the right
+        i |= i >>>  1;
+        i |= i >>>  2;
+        i |= i >>>  4;
+        i |= i >>>  8;
+        i |= i >>> 16;
+        i |= i >>> 32;
+
+        i++;
+
+        return i > 0 ? i : Long.MAX_VALUE;
+    }
+}