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source: branches/PersistenceSpeedUp/HeuristicLab.ExtLibs/HeuristicLab.WinFormsUI/2.3.1/WinFormsUI-2.3.1/Docking/DockPanel.DockDragHandler.cs

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Last change on this file was 4513, checked in by swinkler, 14 years ago
Corrected comments and descriptions (#1182); formatted code.
File size: 24.7 KB

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1	using System.ComponentModel;
2	using System.Drawing;
3	using System.Drawing.Drawing2D;
4	using System.Windows.Forms;
5
6	namespace WeifenLuo.WinFormsUI.Docking {
7	partial class DockPanel {
8	private sealed class DockDragHandler : DragHandler {
9	private class DockIndicator : DragForm {
10	#region IHitTest
11	private interface IHitTest {
12	DockStyle HitTest(Point pt);
13	DockStyle Status { get; set; }
14	}
15	#endregion
16
17	#region PanelIndicator
18	private class PanelIndicator : PictureBox, IHitTest {
19	private static Image _imagePanelLeft = Resources.DockIndicator_PanelLeft;
20	private static Image _imagePanelRight = Resources.DockIndicator_PanelRight;
21	private static Image _imagePanelTop = Resources.DockIndicator_PanelTop;
22	private static Image _imagePanelBottom = Resources.DockIndicator_PanelBottom;
23	private static Image _imagePanelFill = Resources.DockIndicator_PanelFill;
24	private static Image _imagePanelLeftActive = Resources.DockIndicator_PanelLeft_Active;
25	private static Image _imagePanelRightActive = Resources.DockIndicator_PanelRight_Active;
26	private static Image _imagePanelTopActive = Resources.DockIndicator_PanelTop_Active;
27	private static Image _imagePanelBottomActive = Resources.DockIndicator_PanelBottom_Active;
28	private static Image _imagePanelFillActive = Resources.DockIndicator_PanelFill_Active;
29
30	public PanelIndicator(DockStyle dockStyle) {
31	m_dockStyle = dockStyle;
32	SizeMode = PictureBoxSizeMode.AutoSize;
33	Image = ImageInactive;
34	}
35
36	private DockStyle m_dockStyle;
37	private DockStyle DockStyle {
38	get { return m_dockStyle; }
39	}
40
41	private DockStyle m_status;
42	public DockStyle Status {
43	get { return m_status; }
44	set {
45	if (value != DockStyle && value != DockStyle.None)
46	throw new InvalidEnumArgumentException();
47
48	if (m_status == value)
49	return;
50
51	m_status = value;
52	IsActivated = (m_status != DockStyle.None);
53	}
54	}
55
56	private Image ImageInactive {
57	get {
58	if (DockStyle == DockStyle.Left)
59	return _imagePanelLeft;
60	else if (DockStyle == DockStyle.Right)
61	return _imagePanelRight;
62	else if (DockStyle == DockStyle.Top)
63	return _imagePanelTop;
64	else if (DockStyle == DockStyle.Bottom)
65	return _imagePanelBottom;
66	else if (DockStyle == DockStyle.Fill)
67	return _imagePanelFill;
68	else
69	return null;
70	}
71	}
72
73	private Image ImageActive {
74	get {
75	if (DockStyle == DockStyle.Left)
76	return _imagePanelLeftActive;
77	else if (DockStyle == DockStyle.Right)
78	return _imagePanelRightActive;
79	else if (DockStyle == DockStyle.Top)
80	return _imagePanelTopActive;
81	else if (DockStyle == DockStyle.Bottom)
82	return _imagePanelBottomActive;
83	else if (DockStyle == DockStyle.Fill)
84	return _imagePanelFillActive;
85	else
86	return null;
87	}
88	}
89
90	private bool m_isActivated = false;
91	private bool IsActivated {
92	get { return m_isActivated; }
93	set {
94	m_isActivated = value;
95	Image = IsActivated ? ImageActive : ImageInactive;
96	}
97	}
98
99	public DockStyle HitTest(Point pt) {
100	return this.Visible && ClientRectangle.Contains(PointToClient(pt)) ? DockStyle : DockStyle.None;
101	}
102	}
103	#endregion PanelIndicator
104
105	#region PaneIndicator
106	private class PaneIndicator : PictureBox, IHitTest {
107	private struct HotSpotIndex {
108	public HotSpotIndex(int x, int y, DockStyle dockStyle) {
109	m_x = x;
110	m_y = y;
111	m_dockStyle = dockStyle;
112	}
113
114	private int m_x;
115	public int X {
116	get { return m_x; }
117	}
118
119	private int m_y;
120	public int Y {
121	get { return m_y; }
122	}
123
124	private DockStyle m_dockStyle;
125	public DockStyle DockStyle {
126	get { return m_dockStyle; }
127	}
128	}
129
130	private static Bitmap _bitmapPaneDiamond = Resources.DockIndicator_PaneDiamond;
131	private static Bitmap _bitmapPaneDiamondLeft = Resources.DockIndicator_PaneDiamond_Left;
132	private static Bitmap _bitmapPaneDiamondRight = Resources.DockIndicator_PaneDiamond_Right;
133	private static Bitmap _bitmapPaneDiamondTop = Resources.DockIndicator_PaneDiamond_Top;
134	private static Bitmap _bitmapPaneDiamondBottom = Resources.DockIndicator_PaneDiamond_Bottom;
135	private static Bitmap _bitmapPaneDiamondFill = Resources.DockIndicator_PaneDiamond_Fill;
136	private static Bitmap _bitmapPaneDiamondHotSpot = Resources.DockIndicator_PaneDiamond_HotSpot;
137	private static Bitmap _bitmapPaneDiamondHotSpotIndex = Resources.DockIndicator_PaneDiamond_HotSpotIndex;
138	private static HotSpotIndex[] _hotSpots = new HotSpotIndex[] {
139	new HotSpotIndex(1, 0, DockStyle.Top),
140	new HotSpotIndex(0, 1, DockStyle.Left),
141	new HotSpotIndex(1, 1, DockStyle.Fill),
142	new HotSpotIndex(2, 1, DockStyle.Right),
143	new HotSpotIndex(1, 2, DockStyle.Bottom)
144	};
145	private static GraphicsPath _displayingGraphicsPath = DrawHelper.CalculateGraphicsPathFromBitmap(_bitmapPaneDiamond);
146
147	public PaneIndicator() {
148	SizeMode = PictureBoxSizeMode.AutoSize;
149	Image = _bitmapPaneDiamond;
150	Region = new Region(DisplayingGraphicsPath);
151	}
152
153	public static GraphicsPath DisplayingGraphicsPath {
154	get { return _displayingGraphicsPath; }
155	}
156
157	public DockStyle HitTest(Point pt) {
158	if (!Visible)
159	return DockStyle.None;
160
161	pt = PointToClient(pt);
162	if (!ClientRectangle.Contains(pt))
163	return DockStyle.None;
164
165	for (int i = _hotSpots.GetLowerBound(0); i <= _hotSpots.GetUpperBound(0); i++) {
166	if (_bitmapPaneDiamondHotSpot.GetPixel(pt.X, pt.Y) == _bitmapPaneDiamondHotSpotIndex.GetPixel(_hotSpots[i].X, _hotSpots[i].Y))
167	return _hotSpots[i].DockStyle;
168	}
169
170	return DockStyle.None;
171	}
172
173	private DockStyle m_status = DockStyle.None;
174	public DockStyle Status {
175	get { return m_status; }
176	set {
177	m_status = value;
178	if (m_status == DockStyle.None)
179	Image = _bitmapPaneDiamond;
180	else if (m_status == DockStyle.Left)
181	Image = _bitmapPaneDiamondLeft;
182	else if (m_status == DockStyle.Right)
183	Image = _bitmapPaneDiamondRight;
184	else if (m_status == DockStyle.Top)
185	Image = _bitmapPaneDiamondTop;
186	else if (m_status == DockStyle.Bottom)
187	Image = _bitmapPaneDiamondBottom;
188	else if (m_status == DockStyle.Fill)
189	Image = _bitmapPaneDiamondFill;
190	}
191	}
192	}
193	#endregion PaneIndicator
194
195	#region consts
196	private int _PanelIndicatorMargin = 10;
197	#endregion
198
199	private DockDragHandler m_dragHandler;
200
201	public DockIndicator(DockDragHandler dragHandler) {
202	m_dragHandler = dragHandler;
203	Controls.AddRange(new Control[] {
204	PaneDiamond,
205	PanelLeft,
206	PanelRight,
207	PanelTop,
208	PanelBottom,
209	PanelFill
210	});
211	Region = new Region(Rectangle.Empty);
212	}
213
214	private PaneIndicator m_paneDiamond = null;
215	private PaneIndicator PaneDiamond {
216	get {
217	if (m_paneDiamond == null)
218	m_paneDiamond = new PaneIndicator();
219
220	return m_paneDiamond;
221	}
222	}
223
224	private PanelIndicator m_panelLeft = null;
225	private PanelIndicator PanelLeft {
226	get {
227	if (m_panelLeft == null)
228	m_panelLeft = new PanelIndicator(DockStyle.Left);
229
230	return m_panelLeft;
231	}
232	}
233
234	private PanelIndicator m_panelRight = null;
235	private PanelIndicator PanelRight {
236	get {
237	if (m_panelRight == null)
238	m_panelRight = new PanelIndicator(DockStyle.Right);
239
240	return m_panelRight;
241	}
242	}
243
244	private PanelIndicator m_panelTop = null;
245	private PanelIndicator PanelTop {
246	get {
247	if (m_panelTop == null)
248	m_panelTop = new PanelIndicator(DockStyle.Top);
249
250	return m_panelTop;
251	}
252	}
253
254	private PanelIndicator m_panelBottom = null;
255	private PanelIndicator PanelBottom {
256	get {
257	if (m_panelBottom == null)
258	m_panelBottom = new PanelIndicator(DockStyle.Bottom);
259
260	return m_panelBottom;
261	}
262	}
263
264	private PanelIndicator m_panelFill = null;
265	private PanelIndicator PanelFill {
266	get {
267	if (m_panelFill == null)
268	m_panelFill = new PanelIndicator(DockStyle.Fill);
269
270	return m_panelFill;
271	}
272	}
273
274	private bool m_fullPanelEdge = false;
275	public bool FullPanelEdge {
276	get { return m_fullPanelEdge; }
277	set {
278	if (m_fullPanelEdge == value)
279	return;
280
281	m_fullPanelEdge = value;
282	RefreshChanges();
283	}
284	}
285
286	public DockDragHandler DragHandler {
287	get { return m_dragHandler; }
288	}
289
290	public DockPanel DockPanel {
291	get { return DragHandler.DockPanel; }
292	}
293
294	private DockPane m_dockPane = null;
295	public DockPane DockPane {
296	get { return m_dockPane; }
297	internal set {
298	if (m_dockPane == value)
299	return;
300
301	DockPane oldDisplayingPane = DisplayingPane;
302	m_dockPane = value;
303	if (oldDisplayingPane != DisplayingPane)
304	RefreshChanges();
305	}
306	}
307
308	private IHitTest m_hitTest = null;
309	private IHitTest HitTestResult {
310	get { return m_hitTest; }
311	set {
312	if (m_hitTest == value)
313	return;
314
315	if (m_hitTest != null)
316	m_hitTest.Status = DockStyle.None;
317
318	m_hitTest = value;
319	}
320	}
321
322	private DockPane DisplayingPane {
323	get { return ShouldPaneDiamondVisible() ? DockPane : null; }
324	}
325
326	private void RefreshChanges() {
327	Region region = new Region(Rectangle.Empty);
328	Rectangle rectDockArea = FullPanelEdge ? DockPanel.DockArea : DockPanel.DocumentWindowBounds;
329
330	rectDockArea = RectangleToClient(DockPanel.RectangleToScreen(rectDockArea));
331	if (ShouldPanelIndicatorVisible(DockState.DockLeft)) {
332	PanelLeft.Location = new Point(rectDockArea.X + _PanelIndicatorMargin, rectDockArea.Y + (rectDockArea.Height - PanelRight.Height) / 2);
333	PanelLeft.Visible = true;
334	region.Union(PanelLeft.Bounds);
335	} else
336	PanelLeft.Visible = false;
337
338	if (ShouldPanelIndicatorVisible(DockState.DockRight)) {
339	PanelRight.Location = new Point(rectDockArea.X + rectDockArea.Width - PanelRight.Width - _PanelIndicatorMargin, rectDockArea.Y + (rectDockArea.Height - PanelRight.Height) / 2);
340	PanelRight.Visible = true;
341	region.Union(PanelRight.Bounds);
342	} else
343	PanelRight.Visible = false;
344
345	if (ShouldPanelIndicatorVisible(DockState.DockTop)) {
346	PanelTop.Location = new Point(rectDockArea.X + (rectDockArea.Width - PanelTop.Width) / 2, rectDockArea.Y + _PanelIndicatorMargin);
347	PanelTop.Visible = true;
348	region.Union(PanelTop.Bounds);
349	} else
350	PanelTop.Visible = false;
351
352	if (ShouldPanelIndicatorVisible(DockState.DockBottom)) {
353	PanelBottom.Location = new Point(rectDockArea.X + (rectDockArea.Width - PanelBottom.Width) / 2, rectDockArea.Y + rectDockArea.Height - PanelBottom.Height - _PanelIndicatorMargin);
354	PanelBottom.Visible = true;
355	region.Union(PanelBottom.Bounds);
356	} else
357	PanelBottom.Visible = false;
358
359	if (ShouldPanelIndicatorVisible(DockState.Document)) {
360	Rectangle rectDocumentWindow = RectangleToClient(DockPanel.RectangleToScreen(DockPanel.DocumentWindowBounds));
361	PanelFill.Location = new Point(rectDocumentWindow.X + (rectDocumentWindow.Width - PanelFill.Width) / 2, rectDocumentWindow.Y + (rectDocumentWindow.Height - PanelFill.Height) / 2);
362	PanelFill.Visible = true;
363	region.Union(PanelFill.Bounds);
364	} else
365	PanelFill.Visible = false;
366
367	if (ShouldPaneDiamondVisible()) {
368	Rectangle rect = RectangleToClient(DockPane.RectangleToScreen(DockPane.ClientRectangle));
369	PaneDiamond.Location = new Point(rect.Left + (rect.Width - PaneDiamond.Width) / 2, rect.Top + (rect.Height - PaneDiamond.Height) / 2);
370	PaneDiamond.Visible = true;
371	using (GraphicsPath graphicsPath = PaneIndicator.DisplayingGraphicsPath.Clone() as GraphicsPath) {
372	Point[] pts = new Point[]
373	{
374	new Point(PaneDiamond.Left, PaneDiamond.Top),
375	new Point(PaneDiamond.Right, PaneDiamond.Top),
376	new Point(PaneDiamond.Left, PaneDiamond.Bottom)
377	};
378	using (Matrix matrix = new Matrix(PaneDiamond.ClientRectangle, pts)) {
379	graphicsPath.Transform(matrix);
380	}
381	region.Union(graphicsPath);
382	}
383	} else
384	PaneDiamond.Visible = false;
385
386	Region = region;
387	}
388
389	private bool ShouldPanelIndicatorVisible(DockState dockState) {
390	if (!Visible)
391	return false;
392
393	if (DockPanel.DockWindows[dockState].Visible)
394	return false;
395
396	return DragHandler.DragSource.IsDockStateValid(dockState);
397	}
398
399	private bool ShouldPaneDiamondVisible() {
400	if (DockPane == null)
401	return false;
402
403	if (!DockPanel.AllowEndUserNestedDocking)
404	return false;
405
406	return DragHandler.DragSource.CanDockTo(DockPane);
407	}
408
409	public override void Show(bool bActivate) {
410	base.Show(bActivate);
411	Bounds = SystemInformation.VirtualScreen;
412	RefreshChanges();
413	}
414
415	public void TestDrop() {
416	Point pt = Control.MousePosition;
417	DockPane = DockHelper.PaneAtPoint(pt, DockPanel);
418
419	if (TestDrop(PanelLeft, pt) != DockStyle.None)
420	HitTestResult = PanelLeft;
421	else if (TestDrop(PanelRight, pt) != DockStyle.None)
422	HitTestResult = PanelRight;
423	else if (TestDrop(PanelTop, pt) != DockStyle.None)
424	HitTestResult = PanelTop;
425	else if (TestDrop(PanelBottom, pt) != DockStyle.None)
426	HitTestResult = PanelBottom;
427	else if (TestDrop(PanelFill, pt) != DockStyle.None)
428	HitTestResult = PanelFill;
429	else if (TestDrop(PaneDiamond, pt) != DockStyle.None)
430	HitTestResult = PaneDiamond;
431	else
432	HitTestResult = null;
433
434	if (HitTestResult != null) {
435	if (HitTestResult is PaneIndicator)
436	DragHandler.Outline.Show(DockPane, HitTestResult.Status);
437	else
438	DragHandler.Outline.Show(DockPanel, HitTestResult.Status, FullPanelEdge);
439	}
440	}
441
442	private static DockStyle TestDrop(IHitTest hitTest, Point pt) {
443	return hitTest.Status = hitTest.HitTest(pt);
444	}
445	}
446
447	private class DockOutline : DockOutlineBase {
448	public DockOutline() {
449	m_dragForm = new DragForm();
450	SetDragForm(Rectangle.Empty);
451	DragForm.BackColor = SystemColors.ActiveCaption;
452	DragForm.Opacity = 0.5;
453	DragForm.Show(false);
454	}
455
456	DragForm m_dragForm;
457	private DragForm DragForm {
458	get { return m_dragForm; }
459	}
460
461	protected override void OnShow() {
462	CalculateRegion();
463	}
464
465	protected override void OnClose() {
466	DragForm.Close();
467	}
468
469	private void CalculateRegion() {
470	if (SameAsOldValue)
471	return;
472
473	if (!FloatWindowBounds.IsEmpty)
474	SetOutline(FloatWindowBounds);
475	else if (DockTo is DockPanel)
476	SetOutline(DockTo as DockPanel, Dock, (ContentIndex != 0));
477	else if (DockTo is DockPane)
478	SetOutline(DockTo as DockPane, Dock, ContentIndex);
479	else
480	SetOutline();
481	}
482
483	private void SetOutline() {
484	SetDragForm(Rectangle.Empty);
485	}
486
487	private void SetOutline(Rectangle floatWindowBounds) {
488	SetDragForm(floatWindowBounds);
489	}
490
491	private void SetOutline(DockPanel dockPanel, DockStyle dock, bool fullPanelEdge) {
492	Rectangle rect = fullPanelEdge ? dockPanel.DockArea : dockPanel.DocumentWindowBounds;
493	rect.Location = dockPanel.PointToScreen(rect.Location);
494	if (dock == DockStyle.Top) {
495	int height = dockPanel.GetDockWindowSize(DockState.DockTop);
496	rect = new Rectangle(rect.X, rect.Y, rect.Width, height);
497	} else if (dock == DockStyle.Bottom) {
498	int height = dockPanel.GetDockWindowSize(DockState.DockBottom);
499	rect = new Rectangle(rect.X, rect.Bottom - height, rect.Width, height);
500	} else if (dock == DockStyle.Left) {
501	int width = dockPanel.GetDockWindowSize(DockState.DockLeft);
502	rect = new Rectangle(rect.X, rect.Y, width, rect.Height);
503	} else if (dock == DockStyle.Right) {
504	int width = dockPanel.GetDockWindowSize(DockState.DockRight);
505	rect = new Rectangle(rect.Right - width, rect.Y, width, rect.Height);
506	} else if (dock == DockStyle.Fill) {
507	rect = dockPanel.DocumentWindowBounds;
508	rect.Location = dockPanel.PointToScreen(rect.Location);
509	}
510
511	SetDragForm(rect);
512	}
513
514	private void SetOutline(DockPane pane, DockStyle dock, int contentIndex) {
515	if (dock != DockStyle.Fill) {
516	Rectangle rect = pane.DisplayingRectangle;
517	if (dock == DockStyle.Right)
518	rect.X += rect.Width / 2;
519	if (dock == DockStyle.Bottom)
520	rect.Y += rect.Height / 2;
521	if (dock == DockStyle.Left \|\| dock == DockStyle.Right)
522	rect.Width -= rect.Width / 2;
523	if (dock == DockStyle.Top \|\| dock == DockStyle.Bottom)
524	rect.Height -= rect.Height / 2;
525	rect.Location = pane.PointToScreen(rect.Location);
526
527	SetDragForm(rect);
528	} else if (contentIndex == -1) {
529	Rectangle rect = pane.DisplayingRectangle;
530	rect.Location = pane.PointToScreen(rect.Location);
531	SetDragForm(rect);
532	} else {
533	using (GraphicsPath path = pane.TabStripControl.GetOutline(contentIndex)) {
534	RectangleF rectF = path.GetBounds();
535	Rectangle rect = new Rectangle((int)rectF.X, (int)rectF.Y, (int)rectF.Width, (int)rectF.Height);
536	using (Matrix matrix = new Matrix(rect, new Point[] { new Point(0, 0), new Point(rect.Width, 0), new Point(0, rect.Height) })) {
537	path.Transform(matrix);
538	}
539	Region region = new Region(path);
540	SetDragForm(rect, region);
541	}
542	}
543	}
544
545	private void SetDragForm(Rectangle rect) {
546	DragForm.Bounds = rect;
547	if (rect == Rectangle.Empty)
548	DragForm.Region = new Region(Rectangle.Empty);
549	else if (DragForm.Region != null)
550	DragForm.Region = null;
551	}
552
553	private void SetDragForm(Rectangle rect, Region region) {
554	DragForm.Bounds = rect;
555	DragForm.Region = region;
556	}
557	}
558
559	public DockDragHandler(DockPanel panel)
560	: base(panel) {
561	}
562
563	public new IDockDragSource DragSource {
564	get { return base.DragSource as IDockDragSource; }
565	set { base.DragSource = value; }
566	}
567
568	private DockOutlineBase m_outline;
569	public DockOutlineBase Outline {
570	get { return m_outline; }
571	private set { m_outline = value; }
572	}
573
574	private DockIndicator m_indicator;
575	private DockIndicator Indicator {
576	get { return m_indicator; }
577	set { m_indicator = value; }
578	}
579
580	private Rectangle m_floatOutlineBounds;
581	private Rectangle FloatOutlineBounds {
582	get { return m_floatOutlineBounds; }
583	set { m_floatOutlineBounds = value; }
584	}
585
586	public void BeginDrag(IDockDragSource dragSource) {
587	DragSource = dragSource;
588
589	if (!BeginDrag()) {
590	DragSource = null;
591	return;
592	}
593
594	Outline = new DockOutline();
595	Indicator = new DockIndicator(this);
596	Indicator.Show(false);
597
598	FloatOutlineBounds = DragSource.BeginDrag(StartMousePosition);
599	}
600
601	protected override void OnDragging() {
602	TestDrop();
603	}
604
605	protected override void OnEndDrag(bool abort) {
606	DockPanel.SuspendLayout(true);
607
608	Outline.Close();
609	Indicator.Close();
610
611	EndDrag(abort);
612
613	// Queue a request to layout all children controls
614	DockPanel.PerformMdiClientLayout();
615
616	DockPanel.ResumeLayout(true, true);
617
618	DragSource = null;
619	}
620
621	private void TestDrop() {
622	Outline.FlagTestDrop = false;
623
624	Indicator.FullPanelEdge = ((Control.ModifierKeys & Keys.Shift) != 0);
625
626	if ((Control.ModifierKeys & Keys.Control) == 0) {
627	Indicator.TestDrop();
628
629	if (!Outline.FlagTestDrop) {
630	DockPane pane = DockHelper.PaneAtPoint(Control.MousePosition, DockPanel);
631	if (pane != null && DragSource.IsDockStateValid(pane.DockState))
632	pane.TestDrop(DragSource, Outline);
633	}
634
635	if (!Outline.FlagTestDrop && DragSource.IsDockStateValid(DockState.Float)) {
636	FloatWindow floatWindow = DockHelper.FloatWindowAtPoint(Control.MousePosition, DockPanel);
637	if (floatWindow != null)
638	floatWindow.TestDrop(DragSource, Outline);
639	}
640	} else
641	Indicator.DockPane = DockHelper.PaneAtPoint(Control.MousePosition, DockPanel);
642
643	if (!Outline.FlagTestDrop) {
644	if (DragSource.IsDockStateValid(DockState.Float)) {
645	Rectangle rect = FloatOutlineBounds;
646	rect.Offset(Control.MousePosition.X - StartMousePosition.X, Control.MousePosition.Y - StartMousePosition.Y);
647	Outline.Show(rect);
648	}
649	}
650
651	if (!Outline.FlagTestDrop) {
652	Cursor.Current = Cursors.No;
653	Outline.Show();
654	} else
655	Cursor.Current = DragControl.Cursor;
656	}
657
658	private void EndDrag(bool abort) {
659	if (abort)
660	return;
661
662	if (!Outline.FloatWindowBounds.IsEmpty)
663	DragSource.FloatAt(Outline.FloatWindowBounds);
664	else if (Outline.DockTo is DockPane) {
665	DockPane pane = Outline.DockTo as DockPane;
666	DragSource.DockTo(pane, Outline.Dock, Outline.ContentIndex);
667	} else if (Outline.DockTo is DockPanel) {
668	DockPanel panel = Outline.DockTo as DockPanel;
669	panel.UpdateDockWindowZOrder(Outline.Dock, Outline.FlagFullEdge);
670	DragSource.DockTo(panel, Outline.Dock);
671	}
672	}
673	}
674
675	private DockDragHandler m_dockDragHandler = null;
676	private DockDragHandler GetDockDragHandler() {
677	if (m_dockDragHandler == null)
678	m_dockDragHandler = new DockDragHandler(this);
679	return m_dockDragHandler;
680	}
681
682	internal void BeginDrag(IDockDragSource dragSource) {
683	GetDockDragHandler().BeginDrag(dragSource);
684	}
685	}
686	}

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