DeleteDropZoneView.java

/**
 * Copyright 2012
 *
 * Nicolas Desjardins
 * https://github.com/mrKlar
 *
 * Facilite solutions
 * http://www.facilitesolutions.com/
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package ca.laplanete.mobile.pageddragdropgrid;

import com.actionbarsherlock.R;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorFilter;
import android.graphics.LightingColorFilter;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.view.View;

public class DeleteDropZoneView extends View {

	private Paint textPaintStraight;
	private Paint textPaintRed;
	private Paint bitmapPaint;
	private Paint bitmapPaintRed;
	private boolean straight = true;

	private Bitmap trash;
	private Rect bounds;


	public DeleteDropZoneView(Context context) {
		super(context);

		bounds = new Rect();

		textPaintStraight = createTextPaint();
		textPaintStraight.setColor(Color.WHITE);

		textPaintRed = createTextPaint();
		textPaintRed.setColor(Color.RED);

		bitmapPaint = createBaseBitmapPaint();

		bitmapPaintRed = createBaseBitmapPaint();
		ColorFilter filter = new LightingColorFilter(Color.RED, 1);
		bitmapPaintRed.setColorFilter(filter);

		setBackgroundColor(Color.BLACK);
		getBackground().setAlpha(200);

	}

	private Paint createTextPaint() {
		Paint textPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
		textPaint.setStyle(Style.FILL);
		textPaint.setTextAlign(Paint.Align.CENTER);
		textPaint.setTypeface(Typeface.DEFAULT_BOLD);
		return textPaint;
	}

	private Paint createBaseBitmapPaint() {
		Paint bitmapPaint = new Paint();
		bitmapPaint.setAntiAlias(true);
		bitmapPaint.setFilterBitmap(true);
		bitmapPaint.setDither(true);
		return bitmapPaint;
	}

	@Override
	protected void onDraw(Canvas canvas) {
		super.onDraw(canvas);

		int measuredHeight = getMeasuredHeight();
		int measuredWidth = getMeasuredWidth();
		String removeString = getResources().getString(R.string.removeItem);

		initTrashIcon();

		textPaintStraight.getTextBounds(removeString, 0, 6, bounds);

		int proportion = 3 * measuredHeight / 4;
		if (straight) {
			textPaintStraight.setTextSize(proportion);
			canvas.drawText(removeString, (measuredWidth / 2) + (trash.getWidth() / 2) + 5, measuredHeight - ((measuredHeight - bounds.height()) / 2) , textPaintStraight);
			canvas.drawBitmap(trash, (measuredWidth / 2) - (bounds.width() / 2) - (trash.getWidth() / 2) - 10, 0, bitmapPaint);
		} else {
			textPaintRed.setTextSize(proportion);
			canvas.drawText(removeString, (measuredWidth / 2) + (trash.getWidth() / 2) + 5, measuredHeight - ((measuredHeight - bounds.height()) / 2) , textPaintRed);
			canvas.drawBitmap(trash, (measuredWidth / 2) - (bounds.width() / 2) - (trash.getWidth() / 2) - 10, 0, bitmapPaintRed);
		}
	}

	private void initTrashIcon() {
		if (trash == null) {
			trash = getImage(R.drawable.pddg_content_discard, getMeasuredHeight(), getMeasuredHeight());
		}
	}

	public void highlight() {
		straight = false;
		invalidate();
	}

	public void smother() {
		straight = true;
		invalidate();
	}

	private Bitmap getImage (int id, int width, int height) {
	    Bitmap bmp = BitmapFactory.decodeResource( getResources(), id );
	    Bitmap img = Bitmap.createScaledBitmap(bmp, width, height, true);
	    bmp.recycle();
	    invalidate();
	    return img;
	}

}