Add third_party/android_data_chart for data chart widget.

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

Index: third_party/android_snippets/java/src/org/chromium/third_party/android/datausagechart/ChartView.java
diff --git a/third_party/android_snippets/java/src/org/chromium/third_party/android/datausagechart/ChartView.java b/third_party/android_snippets/java/src/org/chromium/third_party/android/datausagechart/ChartView.java
new file mode 100644
index 0000000000000000000000000000000000000000..8ce1e10c3c1b8aebd5c6b5f5f2412b344fc15edd
--- /dev/null
+++ b/third_party/android_snippets/java/src/org/chromium/third_party/android/datausagechart/ChartView.java
@@ -0,0 +1,121 @@
+/*
+ * 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.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 org.chromium.third_party.android.R;
+
+/**
+ * Container for two-dimensional chart, drawn with a combination of
+ * {@link ChartGridView} and {@link ChartNetworkSeriesView} children. The entire chart uses
+ * {@link ChartAxis} to map between raw values and screen coordinates.
+ * Derived from com.android.settings.widget.ChartView
+ */
+public class ChartView extends FrameLayout {
+    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) {
+        if (horiz == null) throw new NullPointerException("missing horiz");
+        if (vert == null) throw new NullPointerException("missing vert");
+        mHoriz = horiz;
+        mVert = 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 || child instanceof ChartGridView) {
+                // 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);
+
+            }
+        }
+    }
+}