Android Open Source - Thrift-box Color Picker Panel View

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * Copyright (C) 2010 Daniel Nilsson/*from  w  w w.  jav a 2 s  .c  o m*/
 *
 * 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 net.margaritov.preference.colorpicker;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;

/**
 * This class draws a panel which which will be filled with a color which can be set.
 * It can be used to show the currently selected color which you will get from
 * the {@link ColorPickerView}.
 * @author Daniel Nilsson
 *
 */
public class ColorPickerPanelView extends View {

  /**
   * The width in pixels of the border
   * surrounding the color panel.
   */
  private final static float  BORDER_WIDTH_PX = 1;

  private float mDensity = 1f;

  private int     mBorderColor = 0xff6E6E6E;
  private int     mColor = 0xff000000;

  private Paint    mBorderPaint;
  private Paint    mColorPaint;

  private RectF    mDrawingRect;
  private RectF    mColorRect;

  private AlphaPatternDrawable mAlphaPattern;


  public ColorPickerPanelView(Context context){
    this(context, null);
  }

  public ColorPickerPanelView(Context context, AttributeSet attrs){
    this(context, attrs, 0);
  }

  public ColorPickerPanelView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    init();
  }

  private void init(){
    mBorderPaint = new Paint();
    mColorPaint = new Paint();
    mDensity = getContext().getResources().getDisplayMetrics().density;
  }


  @Override
  protected void onDraw(Canvas canvas) {

    final RectF  rect = mColorRect;

    if(BORDER_WIDTH_PX > 0){
      mBorderPaint.setColor(mBorderColor);
      canvas.drawRect(mDrawingRect, mBorderPaint);
    }

    if(mAlphaPattern != null){
      mAlphaPattern.draw(canvas);
    }

    mColorPaint.setColor(mColor);

    canvas.drawRect(rect, mColorPaint);
  }

  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

    int width = MeasureSpec.getSize(widthMeasureSpec);
    int height = MeasureSpec.getSize(heightMeasureSpec);

    setMeasuredDimension(width, height);
  }

  @Override
  protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    super.onSizeChanged(w, h, oldw, oldh);

    mDrawingRect = new RectF();
    mDrawingRect.left =  getPaddingLeft();
    mDrawingRect.right  = w - getPaddingRight();
    mDrawingRect.top = getPaddingTop();
    mDrawingRect.bottom = h - getPaddingBottom();

    setUpColorRect();

  }

  private void setUpColorRect(){
    final RectF  dRect = mDrawingRect;

    float left = dRect.left + BORDER_WIDTH_PX;
    float top = dRect.top + BORDER_WIDTH_PX;
    float bottom = dRect.bottom - BORDER_WIDTH_PX;
    float right = dRect.right - BORDER_WIDTH_PX;

    mColorRect = new RectF(left,top, right, bottom);

    mAlphaPattern = new AlphaPatternDrawable((int)(5 * mDensity));

    mAlphaPattern.setBounds(
      Math.round(mColorRect.left),
      Math.round(mColorRect.top),
      Math.round(mColorRect.right),
      Math.round(mColorRect.bottom)
    );

  }

  /**
   * Set the color that should be shown by this view.
   * @param color
   */
  public void setColor(int color){
    mColor = color;
    invalidate();
  }

  /**
   * Get the color currently show by this view.
   * @return
   */
  public int getColor(){
    return mColor;
  }

  /**
   * Set the color of the border surrounding the panel.
   * @param color
   */
  public void setBorderColor(int color){
    mBorderColor = color;
    invalidate();
  }

  /**
   * Get the color of the border surrounding the panel.
   */
  public int getBorderColor(){
    return mBorderColor;
  }

}

Java Source Code List

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