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[英]Prevent parent container from scrolling by the mouse wheel if a child (graphic) control is already scrolling
[英]Prevent grid from scrolling on mouse down
當用戶的鼠標左鍵按下並移動時,如何防止Windows(7/8)滾動(觸摸事件?) Infragistics
UltraGrid
? 此行為使我的拖放事件變得混亂。
我正在使用UltraGrid
接收並啟動拖放。 當用戶單擊網格中的項目時,我將變量leftButton
設置為true,因此可以防止將該項目放到自身上。 我正在使用MouseLeaveElement
從網格內部啟動DoDragDrop
DragDrop
。
代碼如下。 它在Windows XP中工作,但在Windows 7和8中失敗。現在,釋放鼠標左鍵時將調用mainGrid_MouseLeaveElement
,這已經很晚了,因為拖動應該已經完成。 按下鼠標左鍵並移動鼠標時,Windows OS似乎正在接管。 釋放鼠標按鈕時,它將釋放回應用程序。
private leftMouseDown = false;
public void Fill(ToolbarForm ownerForm, DocumentOwner owner, int? ownerIdentifier)
{
...
this.mainGrid.DragDrop += new DragEventHandler(grid_DragDrop);
this.mainGrid.DragEnter += new DragEventHandler(grid_DragEnter);
this.mainGrid.MouseDown += new MouseEventHandler(mainGrid_MouseDown);
this.mainGrid.MouseUp += new MouseEventHandler(mainGrid_MouseUp);
this.mainGrid.MouseLeaveElement += new Infragistics.Win.UIElementEventHandler(mainGrid_MouseLeaveElement);
...
}
void mainGrid_MouseLeaveElement(object sender, Infragistics.Win.UIElementEventArgs e)
{
if (leftMouseDown)
{
...
DataObject data = new DataObject();
data.SetFileDropList(files);
this.mainGrid.DoDragDrop(data, DragDropEffects.Copy);
leftMouseDown = false;
}
}
void mainGrid_MouseUp(object sender, MouseEventArgs e)
{
if (e.Button == System.Windows.Forms.MouseButtons.Left)
leftMouseDown = false;
}
void mainGrid_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == System.Windows.Forms.MouseButtons.Left)
leftMouseDown = true;
}
public void grid_DragDrop(object sender, DragEventArgs e)
{
string[] filenames = (string[])e.Data.GetData(DataFormats.FileDrop);
foreach (string filename in filenames)
{
this.AddDocument(filename);
}
}
private void grid_DragEnter(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.FileDrop, false) && !leftMouseDown)
{
e.Effect = DragDropEffects.All;
}
else e.Effect = DragDropEffects.None;
}
通過在maingrid上使用SelectionDrag事件而不是MouseLeaveElement解決了此問題。
void maingrid_SelectionDrag(object sender, Infragistics.Win.UIElementEventArgs e)
{
if (leftMouseDown)
{
...
DataObject data = new DataObject();
data.SetFileDropList(files);
this.mainGrid.DoDragDrop(data, DragDropEffects.Copy);
leftMouseDown = false;
}
}
代替
void mainGrid_MouseLeaveElement(object sender, Infragistics.Win.UIElementEventArgs e)
{
if (leftMouseDown)
{
...
DataObject data = new DataObject();
data.SetFileDropList(files);
this.mainGrid.DoDragDrop(data, DragDropEffects.Copy);
leftMouseDown = false;
}
}
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