示例#1
0
        private void RenderNodeRecursively(Node n, RenderContext rc, RenderDevice rs)
        {
            if (n == null)
            {
                return;
            }

            if (!n.Visible) // 'Visible == false' would hide all children
            {
                return;
            }

            // 两个说明:
            //  1) m_localPosDocked 并非一个累积量,因此不需在使用完之后重置
            //  2) m_localPosScrolled 并非一个累积量,因此不需在使用完之后重置
            //  3) m_accumTranslate 只需计算一次,结果可供整个 Children 列表共享使用
            //
            // 上面这三点决定了 m_localPosDocked 和 m_localPosScrolled 作用于当前节点
            // 而 m_accumTranslate 作用于当前节点的 Children 列表

            Point localPosDocked = n.GetDockedPos();

            rc.m_localPosDocked = localPosDocked;

            Point localScrolled = Point.Empty - (Size)n.CurrentScrollOffset;

            rc.m_localPosScrolled = localScrolled;

            rs.RenderNode(n, rc);

            rc.m_accumTranslate.X += (localPosDocked.X + localScrolled.X);
            rc.m_accumTranslate.Y += (localPosDocked.Y + localScrolled.Y);

            Rectangle oldClip = rs.GetCurrentClip(rc);

            if (n.IsScrollable())
            {
                rs.SetCurrentClip(rc, n.GetWorldBounds());
            }

            n.TraverseChildren((Node child) => { RenderNodeRecursively(child, rc, rs); });

            if (n.IsScrollable())
            {
                rs.SetCurrentClip(rc, oldClip);
            }

            rc.m_accumTranslate.X -= (localPosDocked.X + localScrolled.X);
            rc.m_accumTranslate.Y -= (localPosDocked.Y + localScrolled.Y);
        }