TouchSink.java 文件源码

@Override
public void draw(Canvas canvas) {
    if (!isInitialized) {
        calculateRegions();
        connected = getResources().getDrawable(A.drawable.remote_control_connected);
        disconnected = getResources().getDrawable(A.drawable.remote_control_disconnected);
        isInitialized = true;
    }
    int width = this.getWidth();
    int height = this.getHeight();

    Paint paint = new Paint();
    paint.setColor(Color.LTGRAY);
    paint.setStyle(Style.STROKE);

    if (isScrollPadActive()) {
        int sbLeft = width - (xScrollBar * 2 / 3);
        int sbRight = width - (xScrollBar / 3);
        Path path = new Path();
        path.setFillType(FillType.EVEN_ODD);
        path.moveTo((sbLeft + sbRight) / 2, scrollPad.top);
        path.lineTo(sbLeft, scrollPad.top + yBorder / 2);
        path.lineTo(sbRight, scrollPad.top + yBorder / 2);
        path.lineTo((sbLeft + sbRight) / 2, scrollPad.top);
        path.close();
        canvas.drawPath(path, paint);

        path = new Path();
        path.setFillType(FillType.EVEN_ODD);
        path.moveTo((sbLeft + sbRight) / 2, scrollPad.bottom);
        path.lineTo(sbLeft, scrollPad.bottom - yBorder / 2);
        path.lineTo(sbRight, scrollPad.bottom - yBorder / 2);
        path.lineTo((sbLeft + sbRight) / 2, scrollPad.bottom);
        path.close();
        canvas.drawPath(path, paint);

        for (int i = (2 * yBorder); i < height - (2 * yBorder); i += yScrollBarItem) {
            canvas.drawRect(
                    new Rect(sbLeft, i, sbRight, Math.min((i + (yScrollBarItem / 2)), (height - (2 * yScrollBarItem)))), paint);
        }
    }

    if (isButtonsActive()) {
        canvas.drawRoundRect(leftButton, 5, 5, paint);
        canvas.drawRoundRect(rightButton, 5, 5, paint);
    }

    if (isTouchPadActive()) {
        canvas.drawLines(new float[] { touchPad.left, touchPad.top + yBorder, touchPad.left, touchPad.bottom - yBorder,
                touchPad.right, touchPad.top + yBorder, touchPad.right, touchPad.bottom - yBorder, touchPad.left + xBorder,
                touchPad.top, touchPad.right - xBorder, touchPad.top, touchPad.left + xBorder, touchPad.bottom,
                touchPad.right - xBorder, touchPad.bottom }, paint);
    }

    if (isPointerStickActive()) {
        canvas.drawOval(pointerStick, paint);
        canvas.drawOval(pointerStickCenter, paint);
    }

    Drawable image = ((client != null) && client.isConnected()) ? connected : disconnected;
    if (image instanceof BitmapDrawable) {
        Bitmap bitmap = ((BitmapDrawable) image).getBitmap();
        Matrix matrix = new Matrix();
        matrix.setScale(0.5F, 0.5F);
        canvas.drawBitmap(bitmap, matrix, new Paint());
    }

    invalidate();
}