コード例 #1
0
        public override void draw(android.graphics.Canvas canvas)
        {
            bool vertical    = mVertical;
            int  extent      = mExtent;
            int  range       = mRange;
            bool drawTrack_1 = true;
            bool drawThumb_1 = true;

            if (extent <= 0 || range <= extent)
            {
                drawTrack_1 = vertical ? mAlwaysDrawVerticalTrack : mAlwaysDrawHorizontalTrack;
                drawThumb_1 = false;
            }
            android.graphics.Rect r = getBounds();
            if (canvas.quickReject(r.left, r.top, r.right, r.bottom, android.graphics.Canvas.EdgeType
                                   .AA))
            {
                return;
            }
            if (drawTrack_1)
            {
                drawTrack(canvas, r, vertical);
            }
            if (drawThumb_1)
            {
                int size      = vertical ? r.height() : r.width();
                int thickness = vertical ? r.width() : r.height();
                int length    = Sharpen.Util.Round((float)size * extent / range);
                int offset    = Sharpen.Util.Round((float)(size - length) * mOffset / (range - extent
                                                                                       ));
                // avoid the tiny thumb
                int minLength = thickness * 2;
                if (length < minLength)
                {
                    length = minLength;
                }
                // avoid the too-big thumb
                if (offset + length > size)
                {
                    offset = size - length;
                }
                drawThumb(canvas, r, offset, length, vertical);
            }
        }