ContentFragment.java

/*
 * 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.androsz.flatnote.app;

import java.util.StringTokenizer;

import android.app.ActionBar;
import android.app.Fragment;
import android.content.ClipData;
import android.content.ClipData.Item;
import android.content.ClipDescription;
import android.os.Bundle;
import android.view.DragEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ImageView;

import com.androsz.flatnote.R;

public class ContentFragment extends Fragment {

	@Override
	public void onActivityCreated(Bundle savedInstanceState) {
		super.onActivityCreated(savedInstanceState);
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		final View view = inflater.inflate(R.layout.content_welcome, null);
		final ImageView imageView = (ImageView) view.findViewById(R.id.image);
		view.setDrawingCacheEnabled(false);

		view.setOnDragListener(new View.OnDragListener() {
			@Override
			public boolean onDrag(View v, DragEvent event) {
				switch (event.getAction()) {
				case DragEvent.ACTION_DRAG_STARTED:
					return processDragStarted(event);
				case DragEvent.ACTION_DROP:
					return processDrop(event, imageView);
				}
				return false;
			}
		});

		view.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				final ActionBar bar = ContentFragment.this.getActivity()
						.getActionBar();
				if (bar != null) {
					if (bar.isShowing()) {
						bar.hide();
					} else {
						bar.show();
					}
				}
			}
		});
		return view;
	}

	boolean processDragStarted(DragEvent event) {
		// Determine whether to continue processing drag and drop based on the
		// plain text mime type.
		final ClipDescription clipDesc = event.getClipDescription();
		if (clipDesc != null)
			return clipDesc.hasMimeType(ClipDescription.MIMETYPE_TEXT_PLAIN);
		return false;
	}

	boolean processDrop(DragEvent event, ImageView imageView) {
		// Attempt to parse clip data with expected format: category||entry_id.
		// Ignore event if data does not conform to this format.
		final ClipData data = event.getClipData();
		if (data != null) {
			if (data.getItemCount() > 0) {
				final Item item = data.getItemAt(0);
				final String textData = (String) item.getText();
				if (textData != null) {
					final StringTokenizer tokenizer = new StringTokenizer(
							textData, "||");
					if (tokenizer.countTokens() != 2)
						return false;
					int entryId = -1;
					try {
						Integer.parseInt(tokenizer.nextToken());
						entryId = Integer.parseInt(tokenizer.nextToken());
					} catch (final NumberFormatException exception) {
						return false;
					}
					int drawableId = 0;
					switch (entryId) {
					case 0:
						drawableId = R.drawable.red_balloon;
						break;

					case 1:
						drawableId = R.drawable.green_balloon;
						break;

					case 2:
						drawableId = R.drawable.blue_balloon;
						break;

					}
					imageView.setImageDrawable(getResources().getDrawable(
							drawableId));

					return true;
				}
			}
		}
		return false;
	}
}