/// <summary>
/// Unregisters a drag source from the internal cache.
/// </summary>
/// <param name="control">The drag source Control.</param>
public static void UnregisterDefaultDragSource(Control control)
{
if (s_dataContext.ContainsKey(control))
{
DragSourceEntry entry = s_dataContext[control];
var dataObjectCOM = (System.Runtime.InteropServices.ComTypes.IDataObject)entry.data;
// Stop listening to drop description changes
dataObjectCOM.DUnadvise(entry.adviseConnection);
// Unhook the default drag source event handlers
control.GiveFeedback -= DefaultGiveFeedbackHandler;
control.QueryContinueDrag -= DefaultQueryContinueDragHandler;
// Remove the entries from our context caches
s_dataContext.Remove(control);
s_dropDescriptions.Remove(entry.data);
}
}
/// <summary>
/// Registers a Control as a drag source and provides default implementations of
/// GiveFeedback and QueryContinueDrag.
/// </summary>
/// <param name="dragSource">The drag source UIElement instance.</param>
/// <param name="data">The DataObject associated to the drag source.</param>
/// <remarks>Callers must call UnregisterDefaultDragSource when the drag and drop
/// operation is complete to avoid memory leaks.</remarks>
public static void RegisterDefaultDragSource(UIElement dragSource, IDataObject data)
{
// Cache the drag source and the associated data object
var entry = new DragSourceEntry(data);
if (!s_dataContext.ContainsKey(dragSource))
{
s_dataContext.Add(dragSource, entry);
}
else
{
s_dataContext[dragSource] = entry;
}
// We need to listen for drop description changes. If a drop target
// changes the drop description, we shouldn't provide a default one.
entry.adviseConnection = ((System.Runtime.InteropServices.ComTypes.IDataObject)data).Advise(new AdviseSink(data), DropDescriptionFormat, 0);
// Hook up the default drag source event handlers
dragSource.GiveFeedback += DefaultGiveFeedbackHandler;
dragSource.QueryContinueDrag += DefaultQueryContinueDragHandler;
}
/// <summary>
/// Registers a Control as a drag source and provides default implementations of
/// GiveFeedback and QueryContinueDrag.
/// </summary>
/// <param name="control">The drag source Control instance.</param>
/// <param name="data">The DataObject associated to the drag source.</param>
/// <remarks>Callers must call UnregisterDefaultDragSource when the drag and drop
/// operation is complete to avoid memory leaks.</remarks>
public static void RegisterDefaultDragSource(Control control, IDataObject data)
{
// Cache the drag source and the associated data object
DragSourceEntry entry = new DragSourceEntry(data);
if (!s_dataContext.ContainsKey(control))
{
s_dataContext.Add(control, entry);
}
else
{
s_dataContext[control] = entry;
}
// We need to listen for drop description changes. If a drop target
// changes the drop description, we shouldn't provide a default one.
entry.adviseConnection = ComTypes.ComDataObjectExtensions.Advise(((ComTypes.IDataObject)data), new AdviseSink(data), DropDescriptionFormat, 0);
// Hook up the default drag source event handlers
control.GiveFeedback += new GiveFeedbackEventHandler(DefaultGiveFeedbackHandler);
control.QueryContinueDrag += new QueryContinueDragEventHandler(DefaultQueryContinueDragHandler);
}
/// <summary>
/// Registers a Control as a drag source and provides default implementations of
/// GiveFeedback and QueryContinueDrag.
/// </summary>
/// <param name="control">The drag source Control instance.</param>
/// <param name="data">The DataObject associated to the drag source.</param>
/// <remarks>Callers must call UnregisterDefaultDragSource when the drag and drop
/// operation is complete to avoid memory leaks.</remarks>
public static void RegisterDefaultDragSource(Control control, IDataObject data)
{
// Cache the drag source and the associated data object
DragSourceEntry entry = new DragSourceEntry(data);
if (!s_dataContext.ContainsKey(control))
s_dataContext.Add(control, entry);
else
s_dataContext[control] = entry;
// We need to listen for drop description changes. If a drop target
// changes the drop description, we shouldn't provide a default one.
entry.adviseConnection =
ComDataObjectExtensions.Advise(((Runtime.InteropServices.ComTypes.IDataObject) data),
new AdviseSink(data), DropDescriptionFormat, 0);
// Hook up the default drag source event handlers
control.GiveFeedback += DefaultGiveFeedbackHandler;
control.QueryContinueDrag += DefaultQueryContinueDragHandler;
}
/// <summary>
/// Registers a Control as a drag source and provides default implementations of
/// GiveFeedback and QueryContinueDrag.
/// </summary>
/// <param name="dragSource">The drag source UIElement instance.</param>
/// <param name="data">The DataObject associated to the drag source.</param>
/// <remarks>Callers must call UnregisterDefaultDragSource when the drag and drop
/// operation is complete to avoid memory leaks.</remarks>
public static void RegisterDefaultDragSource(UIElement dragSource, IDataObject data)
{
// Cache the drag source and the associated data object
DragSourceEntry entry = new DragSourceEntry(data);
if (!s_dataContext.ContainsKey(dragSource))
s_dataContext.Add(dragSource, entry);
else
s_dataContext[dragSource] = entry;
// We need to listen for drop description changes. If a drop target
// changes the drop description, we shouldn't provide a default one.
entry.adviseConnection = ComTypes.ComDataObjectExtensions.Advise(((ComTypes.IDataObject)data), new AdviseSink(data), DropDescriptionFormat, 0);
// Hook up the default drag source event handlers
dragSource.GiveFeedback += new GiveFeedbackEventHandler(DefaultGiveFeedbackHandler);
dragSource.QueryContinueDrag += new QueryContinueDragEventHandler(DefaultQueryContinueDragHandler);
}
