Android Open Source - holoaccent Toggle Foreground Drawable

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License

The source code is released under:

Apache License

Java Source Code

/*******************************************************************************
 * Copyright 2013 NEGU Soft//  w  ww.  j a v a  2 s.c om
 * 
 * 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.negusoft.holoaccent.drawable;

import android.content.Context;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.drawable.Drawable;
import android.util.DisplayMetrics;
import android.util.TypedValue;

import com.negusoft.holoaccent.R;

public class ToggleForegroundDrawable extends Drawable {

  private static final float LINE_WIDTH_DP = 2.0f;
  private static final float MARGIN_SIDE_DP = 2.0f;
  private static final float MARGIN_BOTTOM_DP = 10.0f;

    private final Paint mPaint;
    private final ToggleConstantState mState;
  
  public ToggleForegroundDrawable(Context c) {
    Resources res = c.getResources();
    DisplayMetrics displayMetrics = res.getDisplayMetrics();

    TypedArray attrs = c.getTheme().obtainStyledAttributes(R.styleable.HoloAccent);
    int color = attrs.getColor(R.styleable.HoloAccent_accentColor, res.getColor(R.color.ha__accent_default));
    attrs.recycle();

        mPaint = getPaint(displayMetrics, color);
        float marginSide = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, MARGIN_SIDE_DP, displayMetrics);
        float marginBottom = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, MARGIN_BOTTOM_DP, displayMetrics);
        
        mState = new ToggleConstantState(displayMetrics, color, marginSide, marginBottom);
  }
  
  ToggleForegroundDrawable(DisplayMetrics metrics, int color, float marginSide, float marginBottom) {
    mState = new ToggleConstantState(metrics, color, marginSide, marginBottom);
    mPaint = getPaint(metrics, color);
  }
  
  public ToggleForegroundDrawable(Resources res, int color) {
    DisplayMetrics displayMetrics = res.getDisplayMetrics();
        mPaint = getPaint(displayMetrics, color);
        float marginSide = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, MARGIN_SIDE_DP, displayMetrics);
        float marginBottom = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, MARGIN_BOTTOM_DP, displayMetrics);

        mState = new ToggleConstantState(displayMetrics, color, marginSide, marginBottom);
  }
  
  private Paint getPaint(DisplayMetrics displayMetrics, int color) {
        float lineWidth = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, LINE_WIDTH_DP, displayMetrics);
    Paint result = new Paint();
    result.setColor(color);
    result.setStyle(Paint.Style.STROKE);
    result.setStrokeWidth(lineWidth);
    return result;
  }
  
  /**
   * It is based on the canvas width and height instead of the bounds 
   * in order not to consider the margins of the button it is drawn in.
   */
  @Override
  public void draw(Canvas canvas) {
    float width = canvas.getWidth();
    float margin = (width / 3) + mState.mMarginSide;
    float posY = canvas.getHeight() - mState.mMarginBottom;
    canvas.drawLine(margin, posY, width - margin, posY, mPaint);
  }

  @Override
  public int getOpacity() {
    return PixelFormat.TRANSLUCENT;
  }

  @Override
  public void setAlpha(int alpha) {
    // empty
  }

  @Override
  public void setColorFilter(ColorFilter cf) {
    // empty
  }

  @Override
  public final ConstantState getConstantState() {
    mState.changingConfigurationValue = super.getChangingConfigurations();
    return mState;
  }
  
  public static class ToggleConstantState extends ConstantState {

    public final DisplayMetrics mDisplayMetrics;
    public final int mColor;
    public final float mMarginSide;
    public final float mMarginBottom;
    
    int changingConfigurationValue;
    
    public ToggleConstantState(DisplayMetrics metrics, int color, float marginSide, float marginBottom) {
      mDisplayMetrics = metrics;
      mColor = color;
      mMarginSide = marginSide;
      mMarginBottom = marginBottom;
    }

    @Override
    public int getChangingConfigurations() {
      return changingConfigurationValue;
    }

    @Override
    public Drawable newDrawable() {
      return new ToggleForegroundDrawable(mDisplayMetrics, mColor, mMarginSide, mMarginBottom);
    }
    
  }

}

Java Source Code List

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