/// <summary>
/// Initialize a new instance of the DragManager class.
/// </summary>
public DragManager()
{
_redirector = new PaletteRedirect();
StateCommon = new PaletteDragDrop(null, null);
_paletteMode = PaletteMode.Global;
DragTargetProviders = new DragTargetProviderCollection();
_dragTargets = new DragTargetList();
_documentCursor = false;
}
/// <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>
/// 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>
/// Release unmanaged and optionally managed resources.
/// </summary>
/// <param name="disposing">Called from Dispose method.</param>
protected virtual void Dispose(bool disposing)
{
// If called from explicit call to Dispose
if (disposing)
{
// No need to call destructor once dispose has occured
GC.SuppressFinalize(this);
_pageDragEndData = null;
_dragTargets = null;
}
// Mark as disposed
_disposed = true;
}
/// <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>
/// 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);
}
}
}
}
/// <summary>
/// Called to cleanup when dragging has finished.
/// </summary>
public virtual void Quit()
{
_pageDragEndData = null;
_dragTargets = null;
}
