Checkpoint of data usage UI, graphs and lists.

Chart of network usage over time, with draggable "sweep" bars for
inspection region and warning/limits.  Talks with NetworkStatsService
for live data, and updates list of application usage as inspection
region changes.

Change-Id: I2a406e6776daf7d74143c07ec683c10fe711c277

src/com/android/settings/widget/ChartView.java

@@ -0,0 +1,120 @@
+/*
+ * 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 android.view.ViewGroup.LayoutParams.MATCH_PARENT;
+import static android.view.ViewGroup.LayoutParams.WRAP_CONTENT;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import android.content.Context;
+import android.graphics.Rect;
+import android.view.Gravity;
+import android.view.View;
+import android.widget.FrameLayout;
+
+/**
+ * Container for two-dimensional chart, drawn with a combination of
+ * {@link ChartGridView}, {@link ChartNetworkSeriesView} and {@link ChartSweepView}
+ * children. The entire chart uses {@link ChartAxis} to map between raw values
+ * and screen coordinates.
+ */
+public class ChartView extends FrameLayout {
+    private static final String TAG = "ChartView";
+
+    // TODO: extend something that supports two-dimensional scrolling
+
+    private final ChartAxis mHoriz;
+    private final ChartAxis mVert;
+
+    private Rect mContent = new Rect();
+
+    public ChartView(Context context, ChartAxis horiz, ChartAxis vert) {
+        super(context);
+
+        mHoriz = checkNotNull(horiz, "missing horiz");
+        mVert = checkNotNull(vert, "missing vert");
+
+        setClipToPadding(false);
+        setClipChildren(false);
+    }
+
+    @Override
+    protected void onLayout(boolean changed, int l, int t, int r, int b) {
+        mContent.set(l + getPaddingLeft(), t + getPaddingTop(), r - getPaddingRight(),
+                b - 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);
+
+            } else if (child instanceof ChartSweepView) {
+                // sweep is always placed along specific dimension
+                final ChartSweepView sweep = (ChartSweepView) child;
+                final ChartAxis axis = sweep.getAxis();
+                final float point = sweep.getPoint();
+
+                if (axis == mHoriz) {
+                    parentRect.left = parentRect.right = (int) point + getPaddingLeft();
+                    parentRect.bottom += child.getMeasuredWidth();
+                    Gravity.apply(params.gravity, child.getMeasuredWidth(), parentRect.height(),
+                            parentRect, childRect);
+
+                } else if (axis == mVert) {
+                    parentRect.top = parentRect.bottom = (int) point + getPaddingTop();
+                    parentRect.right += child.getMeasuredHeight();
+                    Gravity.apply(params.gravity, parentRect.width(), child.getMeasuredHeight(),
+                            parentRect, childRect);
+
+                } else {
+                    throw new IllegalStateException("unexpected axis");
+                }
+            }
+
+            child.layout(childRect.left, childRect.top, childRect.right, childRect.bottom);
+        }
+    }
+
+    public static LayoutParams buildChartParams() {
+        final LayoutParams params = new LayoutParams(MATCH_PARENT, MATCH_PARENT);
+        params.gravity = Gravity.LEFT | Gravity.BOTTOM;
+        return params;
+    }
+
+    public static LayoutParams buildSweepParams() {
+        final LayoutParams params = new LayoutParams(WRAP_CONTENT, WRAP_CONTENT);
+        params.gravity = Gravity.CENTER;
+        return params;
+    }
+
+}