Show Ash like <select> popup on Android tablets

content/public/android/java/src/org/chromium/content/browser/input/SingleSelectPopup.java

Index: content/public/android/java/src/org/chromium/content/browser/input/SingleSelectPopup.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/input/SingleSelectPopup.java b/content/public/android/java/src/org/chromium/content/browser/input/SingleSelectPopup.java
new file mode 100644
index 0000000000000000000000000000000000000000..ebd6ec099420e399d4035a0f56c69fe57737db65
--- /dev/null
+++ b/content/public/android/java/src/org/chromium/content/browser/input/SingleSelectPopup.java
@@ -0,0 +1,154 @@
+// Copyright 2012 The Chromium Authors. All rights reserved.

[Ted C, 2014/04/18 01:28:05]

2014

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.content.browser.input;
+
+import android.content.Context;
+import android.graphics.Rect;
+import android.view.View;
+import android.view.View.MeasureSpec;
+import android.view.View.OnLayoutChangeListener;
+import android.widget.AdapterView;
+import android.widget.LinearLayout;
+import android.widget.ListPopupWindow;
+
+import org.chromium.content.R;
+import org.chromium.content.browser.ContentViewCore;
+import org.chromium.content.browser.RenderCoordinates;
+import org.chromium.ui.base.ViewAndroidDelegate;
+
+import java.util.List;
+
+/**
+ * The Autofill suggestion popup that lists relevant suggestions.
+ */
+public class SingleSelectPopup extends ListPopupWindow implements AdapterView.OnItemClickListener {
+
+    private static final int TEXT_PADDING_DP = 30;
+
+    private final ContentViewCore mContentViewCore;
+    private final Context mContext;
+    private final ViewAndroidDelegate mViewAndroidDelegate;
+    private final SingleSelectPopupDelegate mSelectDelegate;
+    private View mAnchorView;
+    private OnLayoutChangeListener mLayoutChangeListener;
+
+    /**
+     * An interface to handle a SingleSelectPopup object.
+     */
+    public interface SingleSelectPopupDelegate {
+        /**
+         * Handles the selection of an option from a SingleSelectPopup.
+         * @param index The index of the selected option.
+         */
+        public void optionSelected(int index);
+    }
+
+    /**
+     * Shows the popup with the given items.
+     * @param contentViewCore The list of items to show.
+     * @param selectCallback The delegate that gets notified when an option has been selected.
+     */
+    public SingleSelectPopup(ContentViewCore contentViewCore,
+            SingleSelectPopupDelegate selectCallback) {
+        super(contentViewCore.getContext(), null, 0, R.style.SingleSelectPopupWindow);
+        mContext = contentViewCore.getContext();
+        mViewAndroidDelegate = contentViewCore.getViewAndroidDelegate();
+        mContentViewCore = contentViewCore;
+        mSelectDelegate = selectCallback;
+
+        setModal(true);
+        setOnItemClickListener(this);
+
+        mAnchorView = mViewAndroidDelegate.acquireAnchorView();
+        mAnchorView.setId(R.id.single_select_popup_window);
+        mAnchorView.setTag(this);
+
+        mLayoutChangeListener = new OnLayoutChangeListener() {
+            @Override
+            public void onLayoutChange(View v, int left, int top, int right, int bottom,
+                    int oldLeft, int oldTop, int oldRight, int oldBottom) {
+                if (v == mAnchorView) SingleSelectPopup.this.show();
+            }
+        };
+
+        mAnchorView.addOnLayoutChangeListener(mLayoutChangeListener);
+        setAnchorView(mAnchorView);
+    }
+
+    @Override
+    public void show() {
+        super.show();
+        getListView().setDividerHeight(0);
+    }
+
+    /**
+     * Shows the popup with the given items.
+     * @param items The list of items to show.
+     * @param originRect The rect of the select element in css pixels.
+     */
+    public void show(List<SelectPopupItem> items, Rect originRect) {
+        setAdapter(new SingleSelectPopupAdapter(mContext, items));
+        show();
+        float horizontalMargin = mContext.getResources().getDimension(
+                R.dimen.select_popup_horizontal_margin);
+        float borderWidth = mContext.getResources().getDimension(R.dimen.select_popup_border_width);
+        RenderCoordinates renderCoordinates = mContentViewCore.getRenderCoordinates();
+        float anchorX = renderCoordinates.fromPixToDip(
+                renderCoordinates.fromLocalCssToPix(originRect.left)) - horizontalMargin;
+        float anchorY = renderCoordinates.fromPixToDip(
+                renderCoordinates.fromLocalCssToPix(originRect.top));
+        float anchorWidth = renderCoordinates.fromPixToDip(
+                renderCoordinates.fromLocalCssToPix(originRect.right)) - anchorX +
+                horizontalMargin * 2;
+        anchorWidth = Math.max(getDesiredListWidth() + (horizontalMargin + borderWidth) * 2,
+                anchorWidth);
+        float anchorHeight = renderCoordinates.fromPixToDip(
+                renderCoordinates.fromLocalCssToPix(originRect.bottom)) - anchorY;
+        mViewAndroidDelegate.setAnchorViewPosition(mAnchorView, anchorX, anchorY, anchorWidth,
+                anchorHeight);
+    }
+
+    /**
+     * Overrides the default dismiss behavior to request the controller to dismiss the view.
+     */
+    @Override
+    public void dismiss() {
+        hide();
+    }
+
+    /**
+     * Hides the popup and removes the anchor view from the ContainerView.
+     */
+    public void hide() {
+        super.dismiss();
+        mAnchorView.removeOnLayoutChangeListener(mLayoutChangeListener);
+        mAnchorView.setTag(null);
+        mViewAndroidDelegate.releaseAnchorView(mAnchorView);
+    }
+
+    private float getDesiredListWidth() {
+        SingleSelectPopupAdapter adapter = (SingleSelectPopupAdapter) getListView().getAdapter();
+        int maxWidth = 0;
+        View view = null;
+        //FrameLayout fakeParent = new FrameLayout(mContext);
+        for (int i = 0; i < adapter.getCount(); i++) {
+            view = adapter.getView(i, view, null);
+            LinearLayout.LayoutParams params =
+                    new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
+                            LinearLayout.LayoutParams.WRAP_CONTENT);
+            view.setLayoutParams(params);
+            view.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
+            int width = view.getMeasuredWidth();
+            maxWidth = Math.max(maxWidth, view.getMeasuredWidth());
+        }
+        RenderCoordinates renderCoordinates = mContentViewCore.getRenderCoordinates();
+        return renderCoordinates.fromPixToDip(maxWidth);
+    }
+
+    @Override
+    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
+        mSelectDelegate.optionSelected(position);
+    }
+}