Add support for color input datalist on Android

ui/android/java/src/org/chromium/ui/ColorSuggestionListAdapter.java

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.ui;
+
+import android.content.Context;
+import android.graphics.drawable.GradientDrawable;
+import android.graphics.drawable.LayerDrawable;
+import android.text.TextUtils;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.AbsListView.LayoutParams;
+import android.widget.BaseAdapter;
+import android.widget.GridView;
+import android.widget.LinearLayout;
+
+import java.util.ArrayList;
+
+public class ColorSuggestionListAdapter extends BaseAdapter implements View.OnClickListener {

[newt (away), 2013/10/15 18:00:15]

still need javadoc for the class

[keishi, 2013/10/16 04:47:23]

Done.

+    private Context mContext;
+    private ColorSuggestion[] mSuggestions;
+    private OnColorSuggestionClickListener mListener;
+
+    /**
+     * The callback used to indicate the user has clicked on a suggestion.
+     */
+    public interface OnColorSuggestionClickListener {
+
+        /**
+         * Called upon a click on a suggestion.
+         *
+         * @param suggestion The suggestion that was clicked.
+         */
+        void onColorSuggestionClick(ColorSuggestion suggestion);
+    }
+
+    private final static int COLORS_PER_ROW = 4;
+
+    ColorSuggestionListAdapter(Context context, ColorSuggestion[] suggestions) {
+        mContext = context;
+        mSuggestions = suggestions;
+    }
+
+    /**
+     * Sets the listener that will be notified upon a click on a suggestion.
+     */
+    public void setOnColorSuggestionClickListener(OnColorSuggestionClickListener listener) {
+        mListener = listener;
+    }
+
+    /**
+     * Sets up the color button to represent a color suggestion.
+     *
+     * @param button The button view to set up.
+     * @param index The index of the suggestion in mSuggestions.
+     */
+    private void setUpColorButton(View button, int index) {
+        if (index >= mSuggestions.length) {
+            button.setTag(null);
+            button.setContentDescription(null);
+            button.setVisibility(View.INVISIBLE);
+            return;
+        }
+        button.setTag(mSuggestions[index]);
+        button.setVisibility(View.VISIBLE);
+        ColorSuggestion suggestion = mSuggestions[index];
+        LayerDrawable layers = (LayerDrawable) button.getBackground();
+        GradientDrawable swatch =
+                (GradientDrawable) layers.findDrawableByLayerId(R.id.color_button_swatch);
+        swatch.setColor(suggestion.mColor);
+        String description = suggestion.mLabel;
+        if (TextUtils.isEmpty(description)) {
+            description = String.format("#%06X", (0xFFFFFF & suggestion.mColor));
+        }
+        button.setContentDescription(description);
+        button.setOnClickListener(this);
+    }
+
+    @Override
+    public void onClick(View v) {
+        if (mListener == null) {
+            return;
+        }
+        ColorSuggestion suggestion = (ColorSuggestion) v.getTag();
+        if (suggestion == null) {
+            return;
+        }
+        mListener.onColorSuggestionClick(suggestion);
+    }
+
+    @Override
+    public View getView(int position, View convertView, ViewGroup parent) {
+        LinearLayout layout = (LinearLayout) convertView;
+        if (convertView == null) {

[newt (away), 2013/10/15 18:00:15]

nit: convertView -> layout

[keishi, 2013/10/16 04:47:23]

Done.

+            layout = new LinearLayout(mContext);
+            layout.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,
+                                                    LayoutParams.WRAP_CONTENT));
+            layout.setOrientation(LinearLayout.HORIZONTAL);
+            LayoutInflater inflater = LayoutInflater.from(mContext);

[newt (away), 2013/10/15 18:00:15]

inflater is unused

[keishi, 2013/10/16 04:47:23]

Done.

+            for (int i = 0; i < COLORS_PER_ROW; ++i) {
+                View button = new View(mContext);
+                button.setLayoutParams(new android.widget.LinearLayout.LayoutParams(

[newt (away), 2013/10/15 18:00:15]

to make the different types of layout params clear, write
AbsListView.LayoutParams and LinearLayout.LayoutParams instead of importing
AbsListView.LayoutParams.

[keishi, 2013/10/16 04:47:23]

Done.

+                            0,
+                            (int) mContext.getResources().getDimension(R.dimen.color_button_height),

[newt (away), 2013/10/15 18:00:15]

nit: get this value once outside of the loop

[keishi, 2013/10/16 04:47:23]

Done.

+                            1f));
+                button.setBackgroundResource(R.drawable.color_button_background);
+                layout.addView(button);
+            }
+        }
+        for (int i = 0; i < COLORS_PER_ROW; ++i) {
+          setUpColorButton(layout.getChildAt(i), position * COLORS_PER_ROW + i);
+        }
+        return layout;
+    }
+
+    @Override
+    public long getItemId(int position) {
+        return position;
+    }
+
+    @Override
+    public Object getItem(int position) {
+        return null;
+    }
+
+    @Override
+    public int getCount() {
+        return (mSuggestions.length + COLORS_PER_ROW - 1) / COLORS_PER_ROW;
+    }
+}