~~~ 今天幫忙修了一個bug， 在拖動TreeViewItem時，需要滾動TreeView向前翻頁，或向后翻頁。 ~~~ ~~~ 思路： ~~~ ~~~ 1.找到TreeView控件里的ItemsControl ~~~ ~~~ 2.找到ItemsControl里的ScrollViewer ~~~ ~~~ 3.判斷當前每個Item的高度 ~~~ ~~~ 4.通過GetCursorPos獲取屏幕絕對坐標 ~~~ ~~~ 5.通過ItemsControl的PointFromScreen把屏幕坐標轉為相對于ItemsControl的客戶坐標 ~~~ ~~~ 6.判斷當前坐標是否超出第一Item或者最后一個Item ~~~ ~~~ 7.如果超出第一個Item則向上滾動， 如果超出最后一個Item則向下滾動。 ~~~ ~~~ ~~~ ~~~ ~~~ ~~~ [StructLayout(LayoutKind.Sequential)] public struct POINT { public int X; public int Y; public POINT(int x, int y) { this.X = x; this.Y = y; } public override string ToString() { return ("X:" + X + ", Y:" + Y); } } [DllImport("user32.dll", CharSet = CharSet.Auto)] public static extern bool GetCursorPos(out POINT pt); ~~~ ~~~ ~~~ ~~~ private void ScrollItemToView(object sender) { ItemsControl itemsControl = sender as ItemsControl; if (null == itemsControl) { return; } if (null == this.targetItemContainer) { return; } ScrollViewer scv = Utilities.FindChild<ScrollViewer>(itemsControl); if (null != scv) { ~~~ ~~~ //每個Item的Container的高度 double itemHeight = this.targetItemContainer.ActualHeight; POINT currentPosition = new POINT(); GetCursorPos(out currentPosition); Point relativePos = itemsControl.PointFromScreen(new Point(currentPosition.X, currentPosition.Y)); if (relativePos.Y >= itemsControl.ActualHeight - itemHeight) { scv.ScrollToVerticalOffset(scv.VerticalOffset + itemHeight); } else if (relativePos.Y <= itemHeight) { scv.ScrollToVerticalOffset(scv.VerticalOffset - itemHeight); } } } ~~~