Class TreeViewDragDropController

Represents a class that handles drag and drop operations in SfTreeView.

Inheritance

System.Object

TreeViewDragDropController

Implements

System.IDisposable

Namespace: Syncfusion.UI.Xaml.TreeView

Assembly: Syncfusion.SfTreeView.WPF.dll

Syntax

public class TreeViewDragDropController : Object, IDisposable

Constructors

TreeViewDragDropController()

Initializes a new instance of the TreeViewDragDropController class.

Declaration

public TreeViewDragDropController()

Fields

TreeView

Gets the reference to the SfTreeView control.

Declaration

protected SfTreeView TreeView

Field Value

Type
SfTreeView

Properties

AutoExpandDelay

Gets or sets the time delay to expand the item automatically when CanAutoExpand property is true.

Declaration

public TimeSpan AutoExpandDelay { get; set; }

Property Value

Type	Description
System.TimeSpan	The default value is 3 sec.

CanAutoExpand

Gets or sets a value indicating whether node should be expanded when hover the dragged nodes for specific time interval when DropPosition is DropAsChild. Interval time is based upon the AutoExpandDelay property.

Declaration

public bool CanAutoExpand { get; set; }

Property Value

Type
System.Boolean

Methods

Dispose()

Disposes all the resources used by the TreeViewDragDropController class.

Declaration

public void Dispose()

Dispose(Boolean)

Disposes all the resources used by the TreeViewDragDropController class.

Declaration

protected virtual void Dispose(bool disposing)

Parameters

Type	Name	Description
System.Boolean	disposing	true to release all the resources.

GetDropPosition(DragEventArgs, Int32)

Gets the dropping position of a dragging item.

Declaration

protected virtual DropPosition GetDropPosition(DragEventArgs args, int rowIndex)

Parameters

Type	Name	Description
System.Windows.DragEventArgs	args	The System.Windows.DragEventArgs that contains the event data.
System.Int32	rowIndex	Specified index on which the mouse is hovered.

Returns

Type	Description
DropPosition	Returns appropriate position at which the dragging items would be dropped.

ProcessDragSourceOnDrop(SfTreeView, ObservableCollection<TreeViewNode>)

Removes dragged nodes from the SfTreeView while dropping.

Declaration

protected virtual void ProcessDragSourceOnDrop(SfTreeView sourceTreeView, ObservableCollection<TreeViewNode> treeViewNodes)

Parameters

Type	Name	Description
SfTreeView	sourceTreeView	The SfTreeView from which the drag operation is initiated.
System.Collections.ObjectModel.ObservableCollection<TreeViewNode>	treeViewNodes	The collection of TreeViewNode that is being dragged.

ProcessDropOnBoundView(SfTreeView, ObservableCollection<TreeViewNode>, DropPosition, Int32)

Process drop operation in bound view.

Declaration

protected virtual void ProcessDropOnBoundView(SfTreeView sourceTreeView, ObservableCollection<TreeViewNode> treeViewNodes, DropPosition dropPosition, int rowIndex)

Parameters

Type	Name	Description
SfTreeView	sourceTreeView	The SfTreeView from which the drag operation is initiated.
System.Collections.ObjectModel.ObservableCollection<TreeViewNode>	treeViewNodes	The collection of TreeViewNode that is being dragged.
DropPosition	dropPosition	The position at which dragging items will be dropped.
System.Int32	rowIndex	Specified row index on which the dragged items is dropped.

ProcessDropOnUnboundView(SfTreeView, ObservableCollection<TreeViewNode>, DropPosition, Int32)

Process drop operations on unbound view.

Declaration

protected virtual void ProcessDropOnUnboundView(SfTreeView sourceTreeView, ObservableCollection<TreeViewNode> treeViewNodes, DropPosition dropPosition, int rowIndex)

Parameters

Type	Name	Description
SfTreeView	sourceTreeView	The SfTreeView from which the drag operation is initiated.
System.Collections.ObjectModel.ObservableCollection<TreeViewNode>	treeViewNodes	The collection of TreeViewNode that is being dragged.
DropPosition	dropPosition	The position at which dragging items will be dropped.
System.Int32	rowIndex	Specified row index on which the dragged items is dropped.

ProcessOnDragEnter()

Occurs when the input system reports an underlying drag enter event with this element as the origin.

Declaration

protected void ProcessOnDragEnter()

ProcessOnDragLeave(DragEventArgs, Int32)

Occurs when the input system reports an underlying drag event with this element as the origin.

Declaration

protected virtual void ProcessOnDragLeave(DragEventArgs args, int rowIndex)

Parameters

Type	Name	Description
System.Windows.DragEventArgs	args	The System.Windows.DragEventArgs that contains the event data.
System.Int32	rowIndex	Specifies row index based on mouse point.

ProcessOnDragOver(DragEventArgs, Int32)

Occurs when the input system reports an underlying drag event with this element as the potential drop target.

Declaration

protected virtual void ProcessOnDragOver(DragEventArgs args, int rowIndex)

Parameters

Type	Name	Description
System.Windows.DragEventArgs	args	The DragEventArgs that contains the event data.
System.Int32	rowIndex	Specifies row index based on mouse point.

ProcessOnDragStarting(MouseEventArgs, Int32)

Occurs when a drag operation is initiated.

Declaration

protected virtual void ProcessOnDragStarting(MouseEventArgs args, int rowIndex)

Parameters

Type	Name	Description
System.Windows.Input.MouseEventArgs	args	The DragEventArgs that contains the event data.
System.Int32	rowIndex	Specifies the row index based on mouse point.

ProcessOnDrop(DragEventArgs, Int32)

Occurs when the input system reports an underlying drop event with this element as the drop target.

Declaration

protected virtual void ProcessOnDrop(DragEventArgs args, int rowIndex)

Parameters

Type	Name	Description
System.Windows.DragEventArgs	args	The System.Windows.DragEventArgs that contains the event data.
System.Int32	rowIndex	Specifies row index based on mouse point.

ShowDragDropPopup(DropPosition, ObservableCollection<TreeViewNode>, DragEventArgs)

Displays System.Windows.Controls.Primitives.Popup while dragging items in SfTreeView.

Declaration

protected virtual void ShowDragDropPopup(DropPosition dropPosition, ObservableCollection<TreeViewNode> draggingItems, DragEventArgs args)

Parameters

Type	Name	Description
DropPosition	dropPosition	The position at which the dragging items will be dropped.
System.Collections.ObjectModel.ObservableCollection<TreeViewNode>	draggingItems	The collection of TreeViewNode that is being dragged.
System.Windows.DragEventArgs	args	The System.Windows.DragEventArgs that contains the event data.

Implements

System.IDisposable