Class DragDropHelper<TBehavior, TState>
Binds the DragDropManager events with a DragDropBehavior.
Inheritance
Namespace: Telerik.Windows.DragDrop.Behaviors
Assembly: Telerik.Windows.Controls.dll
Syntax
public abstract class DragDropHelper<TBehavior, TState> : Object where TBehavior : DragDropBehavior<TState> where TState : DragDropState, new()Type Parameters
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TBehavior
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TState
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Constructors
DragDropHelper()
Declaration
protected DragDropHelper()Properties
DataConverter
Gets or sets the IDataObjectProvider instance that will be used in the drag-drop operations.
Declaration
public DataConverter DataConverter { get; set; }Property Value
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DataConverter
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DragDropBehavior
Gets or sets the DragDropBehavior that will be used in the drag-drop operations.
Declaration
public TBehavior DragDropBehavior { get; set; }Property Value
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TBehavior
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DragVisualProvider
Gets or sets the DragVisualProvider that will be used in the drag-drop operations.
Declaration
public IDragVisualProvider DragVisualProvider { get; set; }Property Value
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IDragVisualProvider
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Methods
CreateDragVisualProviderState(Point, FrameworkElement, TState)
Creates and initializes a DragVisualProviderState object.
Declaration
protected virtual DragVisualProviderState CreateDragVisualProviderState(Point relativeStartPoint, FrameworkElement control, TState state)Parameters
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System.Windows.Point
relativeStartPoint
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System.Windows.FrameworkElement
control
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TState
state
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Returns
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DragVisualProviderState
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CreateStateForDrop(FrameworkElement, FrameworkElement, Object, Type)
Creates and initializes a DragDropState from the provided DragEventArgs.
Declaration
protected virtual TState CreateStateForDrop(FrameworkElement dropTarget, FrameworkElement dropItemsControl, object data, Type itemType)Parameters
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System.Windows.FrameworkElement
dropTarget
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System.Windows.FrameworkElement
dropItemsControl
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System.Object
data
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System.Type
itemType
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Returns
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TState
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DragDropCompleted(FrameworkElement, Object, Type, Boolean)
When overridden in a derived class allows calling custom code on the DragDropCompleted event.
Declaration
protected virtual void DragDropCompleted(FrameworkElement dropItemsControl, object data, Type itemType, bool wasCanceled)Parameters
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System.Windows.FrameworkElement
dropItemsControl
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System.Object
data
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System.Type
itemType
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System.Boolean
wasCanceled
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DragLeave(FrameworkElement, FrameworkElement, Object, Type)
When overridden in a derived class allows calling custom code on the MouseLeave event.
Declaration
protected virtual void DragLeave(FrameworkElement dropTarget, FrameworkElement dropItemsControl, object data, Type itemType)Parameters
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System.Windows.FrameworkElement
dropTarget
The object that is being dropped. |
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System.Windows.FrameworkElement
dropItemsControl
The destination ItemsControl. |
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System.Object
data
The drag and drop data. |
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System.Type
itemType
The data type of the dragged item. |
DragOver(FrameworkElement, FrameworkElement, Object, Type)
When overridden in a derived class allows calling custom code on the DragOver event.
Declaration
protected virtual DragDropEffects DragOver(FrameworkElement dropTarget, FrameworkElement dropItemsControl, object data, Type itemType)Parameters
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System.Windows.FrameworkElement
dropTarget
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System.Windows.FrameworkElement
dropItemsControl
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System.Object
data
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System.Type
itemType
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Returns
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DragDropEffects
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Drop(FrameworkElement, FrameworkElement, Object, Type)
When overridden in a derived class allows custom code in the Drop event.
Declaration
protected virtual void Drop(FrameworkElement dropTarget, FrameworkElement dropItemsControl, object data, Type itemType)Parameters
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System.Windows.FrameworkElement
dropTarget
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System.Windows.FrameworkElement
dropItemsControl
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System.Object
data
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System.Type
itemType
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FindDraggedItem(FrameworkElement)
Finds the control that contains the provided element. In case of a ListBox drag-drop implementation, this method should return the ListBoxItem that is going to be dragged.
Declaration
protected abstract FrameworkElement FindDraggedItem(FrameworkElement element)Parameters
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System.Windows.FrameworkElement
element
The element that raised the DragInitialize event. |
Returns
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System.Windows.FrameworkElement
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FindDragSource(FrameworkElement)
Finds the control that contains the provided element. In case of a ListBox drag-drop implementation, this method should return a ListBox.
Declaration
protected abstract FrameworkElement FindDragSource(FrameworkElement element)Parameters
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System.Windows.FrameworkElement
element
The element that raised the DragInitialize event. |
Returns
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System.Windows.FrameworkElement
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FindDropItemsControl(FrameworkElement, Object)
Finds the target control that should accept the dragged items. In case of a ListBox drag-drop implementation, this method should return a ListBox.
Declaration
protected abstract FrameworkElement FindDropItemsControl(FrameworkElement element, object data)Parameters
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System.Windows.FrameworkElement
element
The element that raised the Drop event. |
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System.Object
data
The DataObject for the current drag operation. |
Returns
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System.Windows.FrameworkElement
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FindDropTarget(FrameworkElement)
Finds an item from the target control that contains the provided element. In case of a ListBox drag-drop implementation, this method should return a ListBoxItem.
Declaration
protected abstract FrameworkElement FindDropTarget(FrameworkElement element)Parameters
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System.Windows.FrameworkElement
element
The element that raised the Drop event. |
Returns
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System.Windows.FrameworkElement
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GetContainerFromItem(FrameworkElement, Object)
Returns the container for the specified item. When overridden in a derived class allows usage of custom ItemContainerGenerators.
Declaration
protected virtual DependencyObject GetContainerFromItem(FrameworkElement control, object item)Parameters
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System.Windows.FrameworkElement
control
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System.Object
item
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Returns
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System.Windows.DependencyObject
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GetDraggedItems(FrameworkElement)
When overridden in a derived class this method returns the items that should be dragged.
Declaration
protected abstract IEnumerable<object> GetDraggedItems(FrameworkElement draggedItem)Parameters
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System.Windows.FrameworkElement
draggedItem
The source control of the drag operation. |
Returns
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System.Collections.Generic.IEnumerable<System.Object>
The items that should be dragged. |
GetInferredItemType(IEnumerable)
Returns the type of the items in the provided collection.
Declaration
protected static Type GetInferredItemType(IEnumerable itemsSource)Parameters
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System.Collections.IEnumerable
itemsSource
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Returns
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System.Type
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GetItemsFromDataObject(Object, Type)
Retrieves items from the specified data object only of the specified type.
Declaration
protected IEnumerable GetItemsFromDataObject(object data, Type itemType)Parameters
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System.Object
data
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System.Type
itemType
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Returns
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System.Collections.IEnumerable
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GetItemsOfType(IEnumerable, Type)
Returns IEnumerable containing only items from the provided Type.
Declaration
protected static IEnumerable GetItemsOfType(IEnumerable enumerable, Type itemType)Parameters
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System.Collections.IEnumerable
enumerable
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System.Type
itemType
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Returns
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System.Collections.IEnumerable
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GetItemsSource(FrameworkElement)
Returns a list containing the items of the specified control.
Declaration
protected virtual IList GetItemsSource(FrameworkElement element)Parameters
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System.Windows.FrameworkElement
element
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Returns
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System.Collections.IList
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GetItemType(FrameworkElement)
Returns the Type of the items in the provided control.
Declaration
protected Type GetItemType(FrameworkElement control)Parameters
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System.Windows.FrameworkElement
control
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Returns
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System.Type
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