Android Open Source - led-notifier Linear Color Picker

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License

The source code is released under:
Apache License
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Java Source Code

package com.larswerkman.holocolorpicker;
/*from  w w w.  j a v a2s .  com*/
import android.content.Context;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Shader;
import android.os.Bundle;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;

public class LinearColorPicker extends View {

  /*
   * Constants used to save/restore the instance state.
   */
  private static final String STATE_PARENT = "parent";
  private static final String STATE_COLOR = "color";
  private static final String STATE_NOTIFY = "notify_on_restore";
  private static final String STATE_ORIENTATION = "orientation";

  /**
   * Constants used to identify orientation.
   */
  private static final boolean ORIENTATION_HORIZONTAL = true;
  private static final boolean ORIENTATION_VERTICAL = false;

  /**
   * Color array RED, MAGENTA, BLUE, CYAN, GREEN, YELLOW, RED (decreasing order)
   */
  private static final int[] COLORS = new int[] { 0xFFFF0000, 0xFFFF00FF,
    0xFF0000FF, 0xFF00FFFF, 0xFF00FF00, 0xFFFFFF00, 0xFFFF0000 };
  /**
   * Default orientation of the bar.
   */
  private static final boolean ORIENTATION_DEFAULT = ORIENTATION_HORIZONTAL;

  /**
   * The thickness of the bar.
   */
  private int mBarThickness;

  /**
   * The length of the bar.
   */
  private int mBarLength;
  private int mPreferredBarLength;

  /**
   * The radius of the pointer.
   */
  private int mBarPointerRadius;

  /**
   * The radius of the halo of the pointer.
   */
  private int mBarPointerHaloRadius;

  /**
   * The position of the pointer on the bar.
   */
  private int mBarPointerPosition;

  /**
   * {@code Paint} instance used to draw the bar.
   */
  private Paint mBarPaint;

  /**
   * {@code Paint} instance used to draw the pointer.
   */
  private Paint mBarPointerPaint;

  /**
   * {@code Paint} instance used to draw the halo of the pointer.
   */
  private Paint mBarPointerHaloPaint;

  /**
   * The rectangle enclosing the bar.
   */
  private RectF mBarRect = new RectF();

  /**
   * {@code Shader} instance used to fill the shader of the paint.
   */
  private Shader shader;

  /**
   * {@code true} if the user clicked on the pointer to start the move mode. <br>
   * {@code false} once the user stops touching the screen.
   * 
   * @see #onTouchEvent(MotionEvent)
   */
  private boolean mIsMovingPointer;

  /**
   * The ARGB value of the currently selected color.
   */
  private int mColor;

  /**
   * An array of floats that can be build into a {@code Color} <br>
   * Where we can extract the Saturation and Value from.
   */
  private float[] mHSVColor = new float[3];

  /**
   * Used to toggle orientation between vertical and horizontal.
   */
  private boolean mOrientation;
  
  /**
   * When true, restoring color from saved instance also notifies OnColorChangedListener if non-null
   */
  private boolean mNotifyFromRestore;
  
  /**
   * Flag when view is restoring values
   */
  private boolean mRestoring;
  
  /**
   * {@code onColorSelectedListener} instance of the onColorSelectedListener
   */
  private OnColorChangedListener onColorChangedListener;

  public LinearColorPicker(Context context) {
    super(context);
    init(null, 0);
  }

  public LinearColorPicker(Context context, AttributeSet attrs) {
    super(context, attrs);
    init(attrs, 0);
  }

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

  private void init(AttributeSet attrs, int defStyle) {
    final TypedArray a = getContext().obtainStyledAttributes(attrs,
        R.styleable.ColorBars, defStyle, 0);
    final Resources b = getContext().getResources();

    mBarThickness = a.getDimensionPixelSize(
        R.styleable.ColorBars_bar_thickness,
        b.getDimensionPixelSize(R.dimen.bar_thickness));
    mBarLength = a.getDimensionPixelSize(R.styleable.ColorBars_bar_length,
        b.getDimensionPixelSize(R.dimen.bar_length));
    mPreferredBarLength = mBarLength;
    mBarPointerRadius = a.getDimensionPixelSize(
        R.styleable.ColorBars_bar_pointer_radius,
        b.getDimensionPixelSize(R.dimen.bar_pointer_radius));
    mBarPointerHaloRadius = a.getDimensionPixelSize(
        R.styleable.ColorBars_bar_pointer_halo_radius,
        b.getDimensionPixelSize(R.dimen.bar_pointer_halo_radius));
    mOrientation = a.getBoolean(
        R.styleable.ColorBars_bar_orientation_horizontal, ORIENTATION_DEFAULT);
    mNotifyFromRestore = a.getBoolean(R.styleable.ColorBars_notify_from_restore, true);
    a.recycle();

    mBarPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    mBarPaint.setShader(shader);

    mBarPointerPosition = (mBarLength / 2) + mBarPointerHaloRadius;

    mBarPointerHaloPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    mBarPointerHaloPaint.setColor(Color.BLACK);
    mBarPointerHaloPaint.setAlpha(0x50);

    mBarPointerPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    mBarPointerPaint.setColor(0xff81ff00);
  }

  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    final int intrinsicSize = mPreferredBarLength
        + (mBarPointerHaloRadius * 2);

    // Variable orientation
    int measureSpec;
    if (mOrientation == ORIENTATION_HORIZONTAL) {
      measureSpec = widthMeasureSpec;
    }
    else {
      measureSpec = heightMeasureSpec;
    }
    int lengthMode = MeasureSpec.getMode(measureSpec);
    int lengthSize = MeasureSpec.getSize(measureSpec);

    int length;
    if (lengthMode == MeasureSpec.EXACTLY) {
      length = lengthSize;
    }
    else if (lengthMode == MeasureSpec.AT_MOST) {
      length = Math.min(intrinsicSize, lengthSize);
    }
    else {
      length = intrinsicSize;
    }

    int barPointerHaloRadiusx2 = mBarPointerHaloRadius * 2;
    mBarLength = length - barPointerHaloRadiusx2;
    if(mOrientation == ORIENTATION_VERTICAL) {
      setMeasuredDimension(barPointerHaloRadiusx2,
          (mBarLength + barPointerHaloRadiusx2));
    }
    else {
      setMeasuredDimension((mBarLength + barPointerHaloRadiusx2),
          barPointerHaloRadiusx2);
    }
  }

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

    // Fill the rectangle instance based on orientation
    int x1, y1;
    if (mOrientation == ORIENTATION_HORIZONTAL) {
      x1 = (mBarLength + mBarPointerHaloRadius);
      y1 = mBarThickness;
      mBarLength = w - (mBarPointerHaloRadius * 2);
      mBarRect.set(mBarPointerHaloRadius,
          (mBarPointerHaloRadius - (mBarThickness / 2)),
          (mBarLength + (mBarPointerHaloRadius)),
          (mBarPointerHaloRadius + (mBarThickness / 2)));
    }
    else {
      x1 = mBarThickness;
      y1 = (mBarLength + mBarPointerHaloRadius);
      mBarLength = h - (mBarPointerHaloRadius * 2);
      mBarRect.set((mBarPointerHaloRadius - (mBarThickness / 2)),
          mBarPointerHaloRadius,
          (mBarPointerHaloRadius + (mBarThickness / 2)),
          (mBarLength + (mBarPointerHaloRadius)));
    }

    // Update variables that depend of mBarLength.
    if(!isInEditMode()){
      shader = new LinearGradient(mBarPointerHaloRadius, 0,
          x1, y1, COLORS,
          null, Shader.TileMode.CLAMP);
    } else {
      shader = new LinearGradient(mBarPointerHaloRadius, 0,
          x1, y1, COLORS, null,
          Shader.TileMode.CLAMP);
      Color.colorToHSV(0xff81ff00, mHSVColor);
    }

    mBarPaint.setShader(shader);
    float[] hsvColor = new float[3];
    Color.colorToHSV(mColor, hsvColor);
    setPointerPosition(hsvColor[0]);
    if(isInEditMode()){
      mBarPointerPosition = (mBarLength / 2) + mBarPointerHaloRadius;
    }
  }

  @Override
  protected void onDraw(Canvas canvas) {
    // Draw the bar.
    canvas.drawRect(mBarRect, mBarPaint);

    // Calculate the center of the pointer.
    int cX, cY;
    if (mOrientation == ORIENTATION_HORIZONTAL) {
      cX = mBarPointerPosition;
      cY = mBarPointerHaloRadius;
    }
    else {
      cX = mBarPointerHaloRadius;
      cY = mBarPointerPosition;
    }

    // Draw the pointer halo.
    canvas.drawCircle(cX, cY, mBarPointerHaloRadius, mBarPointerHaloPaint);
    // Draw the pointer.
    canvas.drawCircle(cX, cY, mBarPointerRadius, mBarPointerPaint);
  };

  @Override
  public boolean onTouchEvent(MotionEvent event) {
    getParent().requestDisallowInterceptTouchEvent(true);

    // Convert coordinates to our internal coordinate system
    float dimen;
    if (mOrientation == ORIENTATION_HORIZONTAL) {
      dimen = event.getX();
    }
    else {
      dimen = event.getY();
    }

    switch (event.getAction()) {
    case MotionEvent.ACTION_DOWN:
      mIsMovingPointer = true;
      // Check whether the user pressed on the pointer
      if (dimen >= (mBarPointerHaloRadius)
          && dimen <= (mBarPointerHaloRadius + mBarLength)) {
        mBarPointerPosition = Math.round(dimen);
        calculateColor(Math.round(dimen));
        mBarPointerPaint.setColor(mColor);
        invalidate();
      }
      break;
    case MotionEvent.ACTION_MOVE:
      if (mIsMovingPointer) {
        // Move the the pointer on the bar.
        if (dimen >= mBarPointerHaloRadius
            && dimen <= (mBarPointerHaloRadius + mBarLength)) {
          mBarPointerPosition = Math.round(dimen);
          calculateColor(Math.round(dimen));
          mBarPointerPaint.setColor(mColor);
          invalidate();
        } else if (dimen < mBarPointerHaloRadius) {
          mBarPointerPosition = mBarPointerHaloRadius;
          setColorInternal(Color.RED);
          mBarPointerPaint.setColor(mColor);
          invalidate();
        } else if (dimen > (mBarPointerHaloRadius + mBarLength)) {
          mBarPointerPosition = mBarPointerHaloRadius + mBarLength;
          setColorInternal(Color.RED);
          mBarPointerPaint.setColor(mColor);
          invalidate();
        }
      }
      break;
    case MotionEvent.ACTION_UP:
      mIsMovingPointer = false;
      break;
    }
    return true;
  }

  /**
   * Set the current color. Closest approximation <br>
   * <br>
   * 
   * @param color
   */
  public void setColor(int color) {
    setColorInternal(color);
    float [] hsv = new float [3];
    Color.colorToHSV(color, hsv);
    setPointerPosition(hsv[0]);
    calculateColor(mBarPointerPosition);
    Color.colorToHSV(mColor, mHSVColor);
    mBarPointerPaint.setColor(mColor);
    invalidate();
  }
  

  private void setColorInternal (int color){
    int oldColor = mColor;
    mColor = color;
    Color.colorToHSV(mColor, mHSVColor);
    if ((!mRestoring || (mRestoring && mNotifyFromRestore)) && onColorChangedListener != null && oldColor != mColor){
      onColorChangedListener.onColorChanged(mColor);
    }
  }
  
  /**
   * Set a onColorChangedListener
   * 
   * @param {@code OnColorChangedListener}
   */
  public void setOnColorChangedListener(OnColorChangedListener listener) {
    this.onColorChangedListener = listener;
  }
  
  private void setPointerPosition (float hueValue){
    mBarPointerPosition = Math.round((mBarLength*(1- hueValue/360) + mBarPointerHaloRadius));
  }

  private int ave(int s, int d, float p) {
    return s + java.lang.Math.round(p * (d - s));
  }

  /**
   * Calculate the color selected by the pointer on the bar.
   * 
   * @param coord
   *            Coordinate of the pointer.
   */
  private void calculateColor(int coord) {
    coord = coord - mBarPointerHaloRadius;
    if (coord <= 0) {
      coord = 0;
      setColorInternal(COLORS[0]);
    } else if (coord >= mBarLength) {
      coord = mBarLength;
      setColorInternal(COLORS[COLORS.length-1]);
    } else if (coord == mBarPointerHaloRadius) {
      setColorInternal(Color.RED);
    } else if (coord == mBarPointerHaloRadius + mBarLength) {
      setColorInternal(Color.RED);
    } else {
      float floatCoord = coord;
      float unit = (floatCoord / mBarLength);
      //COLORS.length - 1 since one end color does not signify a sector
      float actualSector = unit * (COLORS.length - 1);
      int truncatedSector = (int) actualSector;
      float partSector =  actualSector - truncatedSector;

      int c0 = COLORS[truncatedSector];
      int c1 = COLORS[truncatedSector + 1];
      int a = ave(Color.alpha(c0), Color.alpha(c1), partSector);
      int r = ave(Color.red(c0), Color.red(c1), partSector);
      int g = ave(Color.green(c0), Color.green(c1), partSector);
      int b = ave(Color.blue(c0), Color.blue(c1), partSector);

      setColorInternal(Color.argb(a, r, g, b));
    }

  }

  /**
   * Get the currently selected color.
   * 
   * @return The ARGB value of the currently selected color.
   */
  public int getColor() {
    return mColor;
  }

  @Override
  protected Parcelable onSaveInstanceState() {
    Parcelable superState = super.onSaveInstanceState();

    Bundle state = new Bundle();
    state.putParcelable(STATE_PARENT, superState);
    state.putFloatArray(STATE_COLOR, mHSVColor);
    state.putBoolean(STATE_NOTIFY, mNotifyFromRestore);
    return state;
  }

  @Override
  protected void onRestoreInstanceState(Parcelable state) {
    mRestoring = true;
    Bundle savedState = (Bundle) state;

    Parcelable superState = savedState.getParcelable(STATE_PARENT);
    super.onRestoreInstanceState(superState);

    mNotifyFromRestore = savedState.getBoolean(STATE_NOTIFY);
    setColor(Color.HSVToColor(savedState.getFloatArray(STATE_COLOR)));
    mRestoring = false;
  }
}
Java Source Code List
