/// <summary>
/// Perform the drop action associated with the target.
/// </summary>
/// <param name="screenPt">Position in screen coordinates.</param>
/// <param name="data">Data to pass to the target to process drop.</param>
/// <returns>Drop was performed and the source can perform any removal of pages as required.</returns>
public override bool PerformDrop(Point screenPt, PageDragEndData data)
{
// Transfer the dragged pages into our navigator instance
KryptonPage page = ProcessDragEndData(_navigator, data);
// Make the last page transfer the newly selected page of the navigator
if (page != null)
{
// If the navigator is allowed to have a selected page then select it
if (_navigator.AllowTabSelect)
{
_navigator.SelectedPage = page;
}
// Need to layout so the new cell has been added as a child control and
// therefore can receive the focus we want to give it immediately afterwards
_navigator.PerformLayout();
if (!_navigator.IsDisposed)
{
// Without this DoEvents() call the dropping of multiple pages in a complex arrangement causes an exception for
// a complex reason that is hard to work out (i.e. I'm not entirely sure). Something to do with using select to
// change activation is causing the source workspace control to dispose to earlier.
Application.DoEvents();
_navigator.Select();
}
}
return(true);
}
/// <summary>
/// Add a list of drag targets from the provided interface.
/// </summary>
/// <param name="provider">Interface reference.</param>
/// <param name="dragEndData">Pages data being dragged.</param>
public void AddRange(IDragTargetProvider provider, PageDragEndData dragEndData)
{
DragTargetList targets = provider?.GenerateDragTargets(dragEndData);
if ((targets != null) && (targets.Count > 0))
{
AddRange(targets);
}
}
/// <summary>
/// Find the target the first matches the provided screen point.
/// </summary>
/// <param name="screenPt">Point in screen coordinates.</param>
/// <param name="dragEndData">Data to be dropped at destination.</param>
/// <returns>First target that matches; otherwise null.</returns>
protected virtual DragTarget FindTarget(Point screenPt, PageDragEndData dragEndData)
{
// Ask each target in turn if they are a match for the given screen point
foreach (DragTarget target in DragTargets)
{
if (target.IsMatch(screenPt, dragEndData))
{
return(target);
}
}
// Nothing matches
return(null);
}
/// <summary>
/// Called to initialize the implementation when dragging starts.
/// </summary>
/// <param name="paletteDragDrop">Drawing palette.</param>
/// <param name="renderer">Drawing renderer.</param>
/// <param name="pageDragEndData">Drag data associated with drag operation.</param>
/// <param name="dragTargets">List of all drag targets.</param>
public virtual void Start(IPaletteDragDrop paletteDragDrop,
IRenderer renderer,
PageDragEndData pageDragEndData,
DragTargetList dragTargets)
{
Debug.Assert(paletteDragDrop != null);
Debug.Assert(renderer != null);
Debug.Assert(pageDragEndData != null);
Debug.Assert(dragTargets != null);
PaletteDragDrop = paletteDragDrop;
Renderer = renderer;
PageDragEndData = pageDragEndData;
DragTargets = dragTargets;
}
/// <summary>
/// Called to initialize the implementation when dragging starts.
/// </summary>
/// <param name="paletteDragDrop">Drawing palette.</param>
/// <param name="renderer">Drawing renderer.</param>
/// <param name="pageDragEndData">Drag data associated with drag operation.</param>
/// <param name="dragTargets">List of all drag targets.</param>
public override void Start(IPaletteDragDrop paletteDragDrop,
IRenderer renderer,
PageDragEndData pageDragEndData,
DragTargetList dragTargets)
{
base.Start(paletteDragDrop, renderer, pageDragEndData, dragTargets);
if (_solid == null)
{
// Create and show a window without it taking focus
_solid = new DropSolidWindow(PaletteDragDrop, Renderer);
_solid.SetBounds(0, 0, 1, 1, BoundsSpecified.All);
_solid.ShowWithoutActivate();
_solid.Refresh();
}
}
/// <summary>
/// Is this target a match for the provided screen position.
/// </summary>
/// <param name="screenPt">Position in screen coordinates.</param>
/// <param name="dragEndData">Data to be dropped at destination.</param>
/// <returns>True if a match; otherwise false.</returns>
public override bool IsMatch(Point screenPt, PageDragEndData dragEndData)
{
// First time around...
if (_notDraggedPagesFromNavigator == -1)
{
// Search for any pages that are not from this navigator
_notDraggedPagesFromNavigator = 0;
foreach (KryptonPage page in dragEndData.Pages)
{
if (!_navigator.Pages.Contains(page))
{
_notDraggedPagesFromNavigator = 1;
break;
}
}
}
// If 1 or more pages are not from this navigator then allow transfer into the target
return(_notDraggedPagesFromNavigator > 0 && base.IsMatch(screenPt, dragEndData));
}
/// <summary>
/// Called to initialize the implementation when dragging starts.
/// </summary>
/// <param name="paletteDragDrop">Drawing palette.</param>
/// <param name="renderer">Drawing renderer.</param>
/// <param name="pageDragEndData">Drag data associated with drag operation.</param>
/// <param name="dragTargets">List of all drag targets.</param>
public override void Start(IPaletteDragDrop paletteDragDrop,
IRenderer renderer,
PageDragEndData pageDragEndData,
DragTargetList dragTargets)
{
base.Start(paletteDragDrop, renderer, pageDragEndData, dragTargets);
if (_solid == null)
{
// Create and show a solid feedback window without it taking focus
_solid = new DropSolidWindow(PaletteDragDrop, Renderer);
_solid.SetBounds(0, 0, 1, 1, BoundsSpecified.All);
_solid.ShowWithoutActivate();
_solid.Refresh();
}
ClearClusters();
// Create clusters of related drag targets
foreach (DragTarget target in dragTargets)
{
// Check if the target is actually able to drop inside itself
if (target.IsMatch(target.HotRect.Location, pageDragEndData))
{
// Find the existing cluster for the targets screen rectangle
DockCluster cluster = FindTargetCluster(target);
// Is the target allowed to be added to the found cluster (if there is one found)
if ((cluster == null) || cluster.ExcludeCluster || ((target.Hint & DragTargetHint.ExcludeCluster) == DragTargetHint.ExcludeCluster))
{
_clusters.Add(new DockCluster(PaletteDragDrop, Renderer, target));
}
else
{
cluster.Add(target);
}
}
}
}
private DragTarget FindTarget(Point screenPt, PageDragEndData dragEndData)
{
// Nothing matches
return(null);
}
/// <summary> /// Perform the drop action associated with the target. /// </summary> /// <param name="screenPt">Position in screen coordinates.</param> /// <param name="dragEndData">Data to be dropped at destination.</param> /// <returns>Drop was performed and the source can perform any removal of pages as required.</returns> public abstract bool PerformDrop(Point screenPt, PageDragEndData dragEndData);
/// <summary>
/// Is this target a match for the provided screen position.
/// </summary>
/// <param name="screenPt">Position in screen coordinates.</param>
/// <param name="dragEndData">Data to be dropped at destination.</param>
/// <returns>True if a match; otherwise false.</returns>
public virtual bool IsMatch(Point screenPt, PageDragEndData dragEndData)
{
// Default to matching if the mouse is inside the targets hot area
return(HotRect.Contains(screenPt));
}
