從DataGridView托放數據到TreeView控件

　　實現方法在datagridview的mousedown事件中開始 托放

　　然後在treeview 的 DragEnter 中接收托放

　　最後在treeview的 DragDrop 中處理托放結果

　　注treeview的allowdrop屬性要設置為 true

　　 <fp class='fp-4bci2'></fp> <fp class='fp-5zkgk'></fp>private void dataGridView<fp class='fp-5zkgk'></fp>_MouseDown(object sender<fp class='fp-fpvof'></fp> MouseEventArgs e) <fp class='fp-pxyvu'></fp> { <fp class='fp-iw8ty'></fp> if (e<fp class='fp-jkpw4'></fp>Button == MouseButtons<fp class='fp-buame'></fp>Right) <fp class='fp-lrlrb'></fp> { <fp class='fp-3iv6r'></fp> DataGridView<fp class='fp-jkpw4'></fp>HitTestInfo info = dataGridView<fp class='fp-8u5jk'></fp><fp class='fp-jkpw4'></fp>HitTest(e<fp class='fp-jkpw4'></fp>X<fp class='fp-jfomz'></fp> e<fp class='fp-jkpw4'></fp>Y); <fp class='fp-1z692'></fp> <fp class='fp-lwews'></fp> if (info<fp class='fp-dkyg4'></fp>RowIndex >= <fp class='fp-mf2th'></fp>) <fp class='fp-qlfy0'></fp> { <fp class='fp-4uj6e'></fp> DataGridViewRow dr = (DataGridViewRow) <fp class='fp-u48yj'></fp><fp class='fp-a11er'></fp> dataGridView<fp class='fp-kfwqn'></fp><fp class='fp-9idh2'></fp>Rows[info<fp class='fp-jkpw4'></fp>RowIndex]; <fp class='fp-u48yj'></fp><fp class='fp-kfwqn'></fp> if (dr != null) <fp class='fp-5zkgk'></fp><fp class='fp-pxyvu'></fp> dataGridView<fp class='fp-8u5jk'></fp><fp class='fp-buame'></fp>DoDragDrop(dr<fp class='fp-qanwi'></fp> DragDropEffects<fp class='fp-dkyg4'></fp>Copy); <fp class='fp-kfwqn'></fp><fp class='fp-2nf6j'></fp> } <fp class='fp-u48yj'></fp><fp class='fp-whxz6'></fp> } <fp class='fp-5zkgk'></fp><fp class='fp-o2q1b'></fp> } <fp class='fp-kfwqn'></fp><fp class='fp-zci17'></fp> <fp class='fp-5zkgk'></fp><fp class='fp-cpqll'></fp> private void treeView<fp class='fp-u48yj'></fp>_DragEnter(object sender<fp class='fp-qanwi'></fp> DragEventArgs e) <fp class='fp-8u5jk'></fp><fp class='fp-qlfy0'></fp> { <fp class='fp-u48yj'></fp><fp class='fp-wsx6d'></fp> e<fp class='fp-9idh2'></fp>Effect = DragDropEffects<fp class='fp-dkyg4'></fp>Copy; <fp class='fp-pxyvu'></fp><fp class='fp-a11er'></fp> } <fp class='fp-pxyvu'></fp><fp class='fp-kfwqn'></fp> <fp class='fp-yzt1k'></fp><fp class='fp-h8sqs'></fp> private void treeView<fp class='fp-u48yj'></fp>_DragDrop(object sender<fp class='fp-fpvof'></fp> DragEventArgs e) <fp class='fp-yzt1k'></fp><fp class='fp-2nf6j'></fp> { <fp class='fp-6i8e8'></fp><fp class='fp-8uxew'></fp> if (e<fp class='fp-dkyg4'></fp>Data<fp class='fp-jkpw4'></fp>GetDataPresent(typeof(DataGridViewRow))) <fp class='fp-h8sqs'></fp><fp class='fp-o2q1b'></fp> { <fp class='fp-h8sqs'></fp><fp class='fp-1z692'></fp> Point p = treeView<fp class='fp-u48yj'></fp><fp class='fp-buame'></fp>PointToClient(new Point(e<fp class='fp-jkpw4'></fp>X<fp class='fp-qanwi'></fp> e<fp class='fp-dkyg4'></fp>Y)); <fp class='fp-pxyvu'></fp><fp class='fp-lwews'></fp> TreeViewHitTestInfo index = treeView<fp class='fp-u48yj'></fp><fp class='fp-9idh2'></fp>HitTest(p); <fp class='fp-h8sqs'></fp><fp class='fp-vso1p'></fp> <fp class='fp-6i8e8'></fp><fp class='fp-sxc3c'></fp> if (index<fp class='fp-9idh2'></fp>Node != null) <fp class='fp-4b4ee'></fp><fp class='fp-mf2th'></fp> { <fp class='fp-2nf6j'></fp><fp class='fp-kfwqn'></fp> <fp class='fp-2nf6j'></fp><fp class='fp-yzt1k'></fp> DataGridViewRow drv = (DataGridViewRow)e<fp class='fp-dkyg4'></fp>Data<fp class='fp-dkyg4'></fp>GetData(typeof(DataGridViewRow)); <fp class='fp-76pge'></fp><fp class='fp-iw8ty'></fp> index<fp class='fp-dkyg4'></fp>Node<fp class='fp-dkyg4'></fp>Text = <fp class='fp-mrtvz'></fp>Drop: <fp class='fp-adtg9'></fp> + drv<fp class='fp-dkyg4'></fp>Cells[<fp class='fp-o3iwn'></fp>]<fp class='fp-buame'></fp>ToString(); <fp class='fp-76pge'></fp><fp class='fp-8uxew'></fp> <fp class='fp-76pge'></fp><fp class='fp-81wbx'></fp> } <fp class='fp-4b4ee'></fp><fp class='fp-jkhrg'></fp> } <fp class='fp-iw8ty'></fp><fp class='fp-lwews'></fp> }

　　前面已經實現了從 DataGridView 拖放數據到 TreeView不過拖放是通過 鼠標右鍵完成的 根據windows的一般標准是通過鼠標左鍵來進行數據拖放操作的

　　像windows資源管理器既能處理鼠標左鍵單機的選擇也能處理左鍵拖放操作

　　這個怎麼實現？

　　前面我們只處理了 DataGridView 的mousedown事件 現在要處理 mousedown mousemove mouseup這三個事件來完成這個任務

　　大致過程如下

　　在MouseDown事件裡面和之前一樣處理只是不啟動拖放操作

　　而是保存要拖放的數據 以及建立一個小的矩形框（根據系統DragSize信息）

　　然後在 MouseMove 事件裡面判斷是否已經准備好拖放了如果准備好了就啟動拖放操作

　　（注鼠標在小矩形框范圍內的移動不啟動拖放操作）

　　MouseUp裡面清除哪些標記量

　　這樣就能處理左鍵單擊的選擇和 左鍵拖放了

　　代碼如下

　　 private void dataGridView<fp class='fp-u48yj'></fp>_MouseDown(object sender<fp class='fp-qanwi'></fp> MouseEventArgs e) { if ((e<fp class='fp-jkpw4'></fp>Button & MouseButtons<fp class='fp-9idh2'></fp>Left) == MouseButtons<fp class='fp-buame'></fp>Left) { DataGridView<fp class='fp-dkyg4'></fp>HitTestInfo info = dataGridView<fp class='fp-8u5jk'></fp><fp class='fp-buame'></fp>HitTest(e<fp class='fp-jkpw4'></fp>X<fp class='fp-5nse1'></fp> e<fp class='fp-jkpw4'></fp>Y); if (info<fp class='fp-buame'></fp>RowIndex >= <fp class='fp-o3iwn'></fp>) { dragData = (DataGridViewRow) dataGridView<fp class='fp-5zkgk'></fp><fp class='fp-jkpw4'></fp>Rows[info<fp class='fp-dkyg4'></fp>RowIndex]; Size dragSize = SystemInformation<fp class='fp-jkpw4'></fp>DragSize; dragBoxFromMouseDown = new Rectangle(new Point(e<fp class='fp-buame'></fp>X <fp class='fp-k8xtm'></fp> (dragSize<fp class='fp-dkyg4'></fp>Width / <fp class='fp-h8sqs'></fp>)<fp class='fp-qanwi'></fp> e<fp class='fp-buame'></fp>Y <fp class='fp-a6uj8'></fp> (dragSize<fp class='fp-dkyg4'></fp>Height / <fp class='fp-pxyvu'></fp>))<fp class='fp-5nse1'></fp> dragSize); } } } private void dataGridView<fp class='fp-5zkgk'></fp>_MouseUp(object sender<fp class='fp-qanwi'></fp> MouseEventArgs e) { //reset dragBoxFromMouseDown = Rectangle<fp class='fp-jkpw4'></fp>Empty; dragData = null; } private void dataGridView<fp class='fp-kfwqn'></fp>_MouseMove(object sender<fp class='fp-5nse1'></fp> MouseEventArgs e) { if ((e<fp class='fp-dkyg4'></fp>Button & MouseButtons<fp class='fp-buame'></fp>Left) == MouseButtons<fp class='fp-9idh2'></fp>Left && dragData != null && dragBoxFromMouseDown != Rectangle<fp class='fp-9idh2'></fp>Empty && !dragBoxFromMouseDown<fp class='fp-buame'></fp>Contains(e<fp class='fp-dkyg4'></fp>X<fp class='fp-jfomz'></fp> e<fp class='fp-jkpw4'></fp>Y) ) { //開始拖放; dataGridView<fp class='fp-u48yj'></fp><fp class='fp-dkyg4'></fp>DoDragDrop(dragData<fp class='fp-jfomz'></fp> DragDropEffects<fp class='fp-9idh2'></fp>Copy); } }

　　最後使用中又發現一個問題

　　就是不能用鼠標左鍵圈選單元格了

　　這個該怎麼處理呢？ 這兩個操作是有沖突的

　　這裡我們可以通過時間來控制 即我們要求按下鼠標左鍵 秒之後 拖動鼠標 就啟動數據拖放

　　否則就按默認的圈選單元格

　　即增加一個變量在 MouseDown裡面記錄時間在 MouseMove裡面判斷時間差

　　如果不夠 秒就不啟動數據拖放

From:http://tw.wingwit.com/Article/program/ASP/201311/21667.html