[WifiSetup] L layout update

Changed the layout based on the new design mocks. Copied over
StickyHeaderListView and SetupWizardHeader. Currently using the
generic illustration but will update to Wifi setup specific version
once we get them.

Change-Id: I22bdef8c9860d419be55938e1e4a6a682db5b7e8

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

@@ -0,0 +1,139 @@
+/*
+ * Copyright (C) 2014 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 android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.RectF;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.WindowInsets;
+import android.widget.ListView;
+
+/**
+ * This class provides sticky header functionality in a list view, to use with SetupWizardHeader.
+ * To use this, add a header tagged with "sticky", or a header tagged with "stickyContainer" and
+ * one of its child tagged as "sticky". The sticky container will be draw when the sticky element
+ * hits the top of the view.
+ *
+ * There are a few things to note:
+ * 1. The two supported scenarios are StickyHeaderListView -> Header (stickyContainer) -> sticky,
+ *    and StickyHeaderListView -> Header (sticky). The arrow (->) represents parent/child
+ *    relationship and must be immediate child.
+ * 2. The view does not work well with padding. b/16190933
+ * 3. If fitsSystemWindows is true, then this will offset the sticking position by the height of
+ *    the system decorations at the top of the screen.
+ *
+ * @see com.google.android.setupwizard.util.SetupWizardHeader
+ * @see com.google.android.setupwizard.util.StickyHeaderScrollView
+ *
+ * Copied from com.google.android.setupwizard.util.StickyHeaderListView
+ */
+public class StickyHeaderListView extends ListView {
+
+    private View mSticky;
+    private View mStickyContainer;
+    private boolean mDrawScrollBar;
+    private int mStatusBarInset = 0;
+    private RectF mStickyRect = new RectF();
+
+    public StickyHeaderListView(Context context) {
+        super(context);
+    }
+
+    public StickyHeaderListView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public StickyHeaderListView(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+    }
+
+    public StickyHeaderListView(Context context, AttributeSet attrs, int defStyleAttr,
+                                int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+    }
+
+    @Override
+    protected void onLayout(boolean changed, int l, int t, int r, int b) {
+        super.onLayout(changed, l, t, r, b);
+        if (mSticky == null) {
+            updateStickyView();
+        }
+    }
+
+    public void updateStickyView() {
+        mSticky = findViewWithTag("sticky");
+        mStickyContainer = findViewWithTag("stickyContainer");
+    }
+
+    @Override
+    public boolean dispatchTouchEvent(MotionEvent ev) {
+        if (mStickyRect.contains(ev.getX(), ev.getY())) {
+            ev.offsetLocation(-mStickyRect.left, -mStickyRect.top);
+            return mStickyContainer.dispatchTouchEvent(ev);
+        } else {
+            return super.dispatchTouchEvent(ev);
+        }
+    }
+
+    @Override
+    public void draw(Canvas canvas) {
+        mDrawScrollBar = false;
+        super.draw(canvas);
+        if (mSticky != null) {
+            final int saveCount = canvas.save();
+            // The view to draw when sticking to the top
+            final View drawTarget = mStickyContainer != null ? mStickyContainer : mSticky;
+            // The offset to draw the view at when sticky
+            final int drawOffset = mStickyContainer != null ? mSticky.getTop() : 0;
+            // Position of the draw target, relative to the outside of the scrollView
+            final int drawTop = drawTarget.getTop();
+            if (drawTop + drawOffset < mStatusBarInset || !drawTarget.isShown()) {
+                // ListView does not translate the canvas, so we can simply draw at the top
+                canvas.translate(0, -drawOffset + mStatusBarInset);
+                canvas.clipRect(0, 0, drawTarget.getWidth(), drawTarget.getHeight());
+                drawTarget.draw(canvas);
+                mStickyRect.set(0, -drawOffset + mStatusBarInset, drawTarget.getWidth(),
+                        drawTarget.getHeight() - drawOffset + mStatusBarInset);
+            } else {
+                mStickyRect.setEmpty();
+            }
+            canvas.restoreToCount(saveCount);
+        }
+        // Draw the scrollbars last so they are on top of the header
+        mDrawScrollBar = true;
+        onDrawScrollBars(canvas);
+    }
+
+    @Override
+    protected boolean isVerticalScrollBarHidden() {
+        return super.isVerticalScrollBarHidden() || !mDrawScrollBar;
+    }
+
+    @Override
+    public WindowInsets onApplyWindowInsets(WindowInsets insets) {
+        if (getFitsSystemWindows()) {
+            mStatusBarInset = insets.getSystemWindowInsetTop();
+            insets.consumeSystemWindowInsets(false, true, false, false);
+        }
+        return insets;
+    }
+}