VerticalSlideColorPicker.java 文件源码

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

  viewWidth = w;
  viewHeight = h;

  centerX           = viewWidth / 2;
  colorPickerRadius = (viewWidth / 2) - borderWidth;

  colorPickerBody = new RectF(centerX - colorPickerRadius, borderWidth + colorPickerRadius, centerX + colorPickerRadius, viewHeight - (borderWidth + colorPickerRadius));

  LinearGradient gradient = new LinearGradient(0, colorPickerBody.top, 0, colorPickerBody.bottom, colors, null, Shader.TileMode.CLAMP);
  paint.setShader(gradient);

  if (bitmap != null) {
    bitmap.recycle();
  }

  bitmap       = Bitmap.createBitmap(viewWidth, viewHeight, Bitmap.Config.ARGB_8888);
  bitmapCanvas = new Canvas(bitmap);

  resetToDefault();
}