Android Open Source - BCC Custom Image Button

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License

The source code is released under:

MIT License

Java Source Code

/*
 * Copyright (C) 2009 IT Wizard./*from   ww w  .j a v a  2  s . c o m*/
 * http://www.itwizard.ro
 *
 * 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.itwizard.mezzofanti;

import com.bcc.R;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.View;

/**
 * Class for Buttons that hold images.
 *
 */
public class CustomImageButton extends View 
{
  private int m_nWidthPadding = 0;    // width padding 
  private int m_nHeightPadding = 0;    // height padding
  private final String m_sLabel;    // the label
  private int m_iImageResId;      // the image red-id
  private Bitmap m_bmImage;      // the image
  private Context m_oContext; // Activity context in which the button view is being placed for.
  
  /**
  * Constructor.
  *
  * @param context
  *        Activity context in which the button view is being placed for.
  *
  * @param resImage
  *        Image to put on the button. This image should have been placed
  *        in the drawable resources directory.
  *
  * @param label
  *        The text label to display for the custom button.
  */
  public CustomImageButton(Context context, int resImage, String label, int stretchWidth, int stretchHeigth) 
  {
    super(context);
    m_oContext = context;
    this.m_sLabel = label;
    this.m_iImageResId = resImage;
    if (stretchHeigth == 0 && stretchWidth == 0)
    {
      this.m_bmImage = BitmapFactory.decodeResource(context.getResources(), m_iImageResId);
    }
    else
    {
      Bitmap imageAux = BitmapFactory.decodeResource(context.getResources(),m_iImageResId);
      this.m_bmImage = Bitmap.createScaledBitmap(imageAux, stretchWidth, stretchHeigth, true);
    }  
    setFocusable(true);
    setBackgroundColor(Color.TRANSPARENT);
    
    setClickable(true);
  }
  /**
  * Constructor.
  *
  * @param context
  *        Activity context in which the button view is being placed for.
  *
  * @param attrs
  */
  public CustomImageButton(Context context, AttributeSet attrs) 
  {
    super(context, attrs);
    m_oContext = context;
    this.m_sLabel = "";
    this.m_iImageResId = R.drawable.switch_32;
    this.m_bmImage = BitmapFactory.decodeResource(context.getResources(), m_iImageResId);
    //setFocusable(true);
    setBackgroundColor(Color.TRANSPARENT);
    
    setClickable(true);
  }
  /**
   * Set the internal image to be used for the button.
   * @param resImage the resource-id
   * @param stretchWidth stretch factor for the width
   * @param stretchHeigth stretch factor for the height
   */
  public void SetImage(int resImage, int stretchWidth, int stretchHeigth)
  {
    this.m_iImageResId = resImage;
    if (stretchHeigth == 0 && stretchWidth == 0)
    {
      this.m_bmImage = BitmapFactory.decodeResource(m_oContext.getResources(), m_iImageResId);
    }
    else
    {
      Bitmap imageAux = BitmapFactory.decodeResource(m_oContext.getResources(), m_iImageResId);
      this.m_bmImage = Bitmap.createScaledBitmap(imageAux, stretchWidth, stretchHeigth, true);
    }
  }
  
  /**
   * Set the padding.
   * @param width_padding width padding
   * @param height_padding height padding
   */
  public void SetMargins(int width_padding, int height_padding)
  {
    m_nWidthPadding = width_padding;
    m_nHeightPadding = height_padding;
  }

  /**
  * The method that is called when the focus is changed to or from this view.
  */
  protected void onFocusChanged(boolean gainFocus, int direction,Rect previouslyFocusedRect)
  {
    if (gainFocus == true)
    {
        this.setBackgroundColor(Color.rgb(255, 165, 0));
    }
    else
    {
      setBackgroundColor(Color.TRANSPARENT);
    }
  }  

  /**
  * Method called on to render the view.
  */
  protected void onDraw(Canvas canvas)
  {
    Paint textPaint = new Paint();
    //textPaint.setColor(Color.BLACK);
    canvas.drawBitmap(m_bmImage, m_nWidthPadding / 2, m_nHeightPadding / 2, null);
    if (m_sLabel != null)
      canvas.drawText(m_sLabel, m_nWidthPadding / 2, (m_nHeightPadding / 2) + m_bmImage.getHeight() + 8, textPaint);
  }
  
  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) 
  {
    setMeasuredDimension(MeasureWidth(widthMeasureSpec), MeasureHeight(heightMeasureSpec));
  }
  
  /**
   * Measure the width of the image
   * @param measureSpec the measure specification to extract the size from
   * @return size in pixels
   */
  private int MeasureWidth(int measureSpec)
  {
    int preferred = m_bmImage.getWidth();
    return GetMeasurement(measureSpec, preferred);
  }

  /**
   * Measure the width of the image
   * @param measureSpec the measure specification to extract the size from
   * @return size in pixels
   */
  private int MeasureHeight(int measureSpec)
  {
    int preferred = m_bmImage.getHeight();
    return GetMeasurement(measureSpec, preferred);
  }
  
  /**
   * Get the width/height according to the internal MeasureSpec mode
   * 
   * @param measureSpec the measure specification to extract the size from
   * @param preferred preferred size in pixels
   * @return size in pixels
   */
  private int GetMeasurement(int measureSpec, int preferred)
  {
    int specSize = MeasureSpec.getSize(measureSpec);
    int measurement = 0;
  
    switch(MeasureSpec.getMode(measureSpec))
    {
      case MeasureSpec.EXACTLY:
          // This means the width of this view has been given.
          measurement = specSize;
          break;
      case MeasureSpec.AT_MOST:
          // Take the minimum of the preferred size and what
          // we were told to be.
          measurement = Math.min(preferred, specSize);
          break;
      default:
          measurement = preferred;
      break;
    }

    return measurement;
  }
  

  /**
   * @return the label of the button.
   */
  public String GetLabel()
  {
    return m_sLabel;
  }

  /**
   * @return   the resource id of the image.
   */
  public int GetImageResId()
  {
    return m_iImageResId;
  }
  
}

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