CellDoubleClickEvent and RowReorderBehavior Issue in UI for Silverlight

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CellDoubleClickEvent and RowReorderBehavior Issue

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GridView

This is a migrated thread and some comments may be shown as answers.

Corey asked on 08 Nov 2013, 02:47 PM

I have a RadGridView that has an added GridViewCellBase.CellDoubleClickEvent handler that proceeds to open a dialogue. This dialogue is modal and allows the user to edit settings related to the clicked row.

However, the grid also allows for the rows to be reordered by drag and drop. The problem I've come across, and it's a small but annoying one, is that after the user double clicks the row and closes the dialogue that opened, apparently the row is now subscribed to the drag and drop reordering. The user doesn't have to hold down a mouse button, but the row is being "dragged" and the user has to click somewhere on the grid to end the reordering. If the user isn't paying attention, this may cause some undesired reordering.

Is there a way to not trigger the drag and drop reordering when double clicking a row and opening a modal dialogue?

6 Answers, 1 is accepted

answered on 11 Nov 2013, 03:05 PM

The-Drag-and-Drop.png

Unfortunately, no, this did not resolve my issue. After double clicking the row and closing the dialogue that was opened (as a result of the clicking), the row is selected and assumed to be in the mode for drag and drop reordering. Below is a snippet of my code that pertains to the grid and its double click handler. I've also included an image of what the drag and drop looks like after the dialogue has closed. Hope this helps you help me.

Snippet for building the RadGridView (I omitted the adding of the columns since they are done manually within the code and there are a lot of them)

private void BuildGrid()

{

_selectedColumns = (RadGridView)_lm.AddGridView().Control;

_selectedColumns.IsReadOnly = false;

_selectedColumns.DragElementAction =

Telerik.Windows.Controls.GridView.Selection.DragAction.None;

_selectedColumns.Width = _selectedColumns.MaxWidth = DlgParent.LeftWidth.Value +

DlgParent.RightWidth.Value - 20;

_selectedColumns.Height = _selectedColumns.MaxHeight = DlgParent.PanelHeight - 25;

_selectedColumns.AutoGenerateColumns = false;

_selectedColumns.ShowGroupPanel = false;

_selectedColumns.SelectionMode = System.Windows.Controls.SelectionMode.Extended;

_selectedColumns.IsFilteringAllowed = false;

RowReorderBehavior.SetIsEnabled(_selectedColumns, true);

_selectedColumns.AddHandler(GridViewCellBase.CellDoubleClickEvent,

new EventHandler<RadRoutedEventArgs>(OnCellDoubleClick), true);

_selectedColumns.ItemsSource = _viewAttributes.ViewCols;

}

Snippet for the double clicked event handler

private void OnCellDoubleClick(object sender, RadRoutedEventArgs e)

{

if (_selectedColumns.SelectedItems.Count == 1)

new DlgViewEditColumn((VsViewCol)_selectedColumns.SelectedItems[0], _selectedColumns,

_viewAttributes.Action.PrimaryTable).Show();

else

RadWindow.Alert("Must select only one column for editing options.");

}

answered on 13 Nov 2013, 04:48 PM

My apologies. I didn't realize RowReorderBehavior was one of our custom classes. I thought it was something inherent to the RadGridView. Here is most of the code within the RowReorderBehavior.SetIsEnabled method. I tried turning off the drag and drop handlers when the user triggers the OnCellDoubleClick event, but it didn't help. Closing the window still has the selected row in drag and drop mode. I think it is that the GridView isn't detecting the mouse has been released like you said. Hopefully these snippets might make the problem a little clearer.

SetIsEnabled method

public static void SetIsEnabled(DependencyObject obj, bool value)

{

RowReorderBehavior behavior = GetAttachedBehavior(obj as RadGridView);

behavior.AssociatedObject = obj as RadGridView;

if (value)

behavior.Initialize();

else

behavior.CleanUp();

obj.SetValue(IsEnabledProperty, value);

}

Initialize method (note that the Cleanup method seen in the snippet above removes all the handlers below)

protected virtual void Initialize()

{

this.AssociatedObject.RowLoaded +=

new EventHandler<Telerik.Windows.Controls.GridView.RowLoadedEventArgs>(AssociatedObject_RowLoaded);

this.AssociatedObject.SetValue(RadDragAndDropManager.AllowDropProperty, true);

RadDragAndDropManager.AddDropQueryHandler(this.AssociatedObject, OnDropQuery);

RadDragAndDropManager.AddDropInfoHandler(this.AssociatedObject, OnDropInfo);

RadDragAndDropManager.AddDragQueryHandler(this.AssociatedObject, OnDragQuery);

RadDragAndDropManager.AddDragInfoHandler(this.AssociatedObject, OnDragInfo);

}

AssociatedObject_RowLoaded RowLoaded event handler

void AssociatedObject_RowLoaded(object sender, Telerik.Windows.Controls.GridView.RowLoadedEventArgs e)

{

if (e.Row is GridViewHeaderRow || e.Row is GridViewNewRow || e.Row is GridViewFooterRow)

return;

GridViewRow row = e.Row as GridViewRow;

if (row == null)

return;

row.SetValue(RadDragAndDropManager.AllowDragProperty, true);

row.SetValue(RadDragAndDropManager.AllowDropProperty, true);

RadDragAndDropManager.RemoveDropQueryHandler(row, OnGridViewRowDropQuery);

RadDragAndDropManager.AddDropQueryHandler(row, OnGridViewRowDropQuery);

}

Accepted