From 2bd82d72f594f824954f773d39c39942a7153a89 Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Sat, 14 May 2011 14:17:52 +0000
Subject: [PATCH] Cancel dragging in wxAuiNotebook on capture loss.

Don't leave the display and internal variables in inconsistent state when the
mouse capture is lost while a notebook page is being dragged (as can happen
if Alt-Tab is pressed under Windows, for example).

Closes #9976.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67737 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 include/wx/aui/auibook.h |  1 +
 src/aui/auibook.cpp      | 26 ++++++++++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/include/wx/aui/auibook.h b/include/wx/aui/auibook.h
index 874cbcddf5..c10cd632f3 100644
--- a/include/wx/aui/auibook.h
+++ b/include/wx/aui/auibook.h
@@ -627,6 +627,7 @@ protected:
     void OnTabBeginDrag(wxAuiNotebookEvent& evt);
     void OnTabDragMotion(wxAuiNotebookEvent& evt);
     void OnTabEndDrag(wxAuiNotebookEvent& evt);
+    void OnTabCancelDrag(wxAuiNotebookEvent& evt);
     void OnTabButton(wxAuiNotebookEvent& evt);
     void OnTabMiddleDown(wxAuiNotebookEvent& evt);
     void OnTabMiddleUp(wxAuiNotebookEvent& evt);
diff --git a/src/aui/auibook.cpp b/src/aui/auibook.cpp
index d308cdd4dd..961c45756b 100644
--- a/src/aui/auibook.cpp
+++ b/src/aui/auibook.cpp
@@ -48,6 +48,7 @@ wxDEFINE_EVENT(wxEVT_COMMAND_AUINOTEBOOK_PAGE_CHANGED, wxAuiNotebookEvent);
 wxDEFINE_EVENT(wxEVT_COMMAND_AUINOTEBOOK_BUTTON, wxAuiNotebookEvent);
 wxDEFINE_EVENT(wxEVT_COMMAND_AUINOTEBOOK_BEGIN_DRAG, wxAuiNotebookEvent);
 wxDEFINE_EVENT(wxEVT_COMMAND_AUINOTEBOOK_END_DRAG, wxAuiNotebookEvent);
+wxDEFINE_EVENT(wxEVT_COMMAND_AUINOTEBOOK_CANCEL_DRAG, wxAuiNotebookEvent);
 wxDEFINE_EVENT(wxEVT_COMMAND_AUINOTEBOOK_DRAG_MOTION, wxAuiNotebookEvent);
 wxDEFINE_EVENT(wxEVT_COMMAND_AUINOTEBOOK_ALLOW_DND, wxAuiNotebookEvent);
 wxDEFINE_EVENT(wxEVT_COMMAND_AUINOTEBOOK_BG_DCLICK, wxAuiNotebookEvent);
@@ -2306,6 +2307,16 @@ void wxAuiTabCtrl::OnLeftDown(wxMouseEvent& evt)
 
 void wxAuiTabCtrl::OnCaptureLost(wxMouseCaptureLostEvent& WXUNUSED(event))
 {
+    if (m_is_dragging)
+    {
+        m_is_dragging = false;
+
+        wxAuiNotebookEvent evt(wxEVT_COMMAND_AUINOTEBOOK_CANCEL_DRAG, m_windowId);
+        evt.SetSelection(GetIdxFromWindow(m_click_tab));
+        evt.SetOldSelection(evt.GetSelection());
+        evt.SetEventObject(this);
+        GetEventHandler()->ProcessEvent(evt);
+    }
 }
 
 void wxAuiTabCtrl::OnLeftUp(wxMouseEvent& evt)
@@ -2824,6 +2835,9 @@ BEGIN_EVENT_TABLE(wxAuiNotebook, wxControl)
     EVT_AUI_RANGE(wxAuiBaseTabCtrlId, wxAuiBaseTabCtrlId+500,
                       wxEVT_COMMAND_AUINOTEBOOK_END_DRAG,
                       wxAuiNotebook::OnTabEndDrag)
+    EVT_AUI_RANGE(wxAuiBaseTabCtrlId, wxAuiBaseTabCtrlId+500,
+                      wxEVT_COMMAND_AUINOTEBOOK_CANCEL_DRAG,
+                      wxAuiNotebook::OnTabCancelDrag)
     EVT_AUI_RANGE(wxAuiBaseTabCtrlId, wxAuiBaseTabCtrlId+500,
                       wxEVT_COMMAND_AUINOTEBOOK_DRAG_MOTION,
                       wxAuiNotebook::OnTabDragMotion)
@@ -4114,6 +4128,18 @@ void wxAuiNotebook::OnTabEndDrag(wxAuiNotebookEvent& evt)
 
 
 
+void wxAuiNotebook::OnTabCancelDrag(wxAuiNotebookEvent& command_evt)
+{
+    wxAuiNotebookEvent& evt = (wxAuiNotebookEvent&)command_evt;
+
+    m_mgr.HideHint();
+
+    wxAuiTabCtrl* src_tabs = (wxAuiTabCtrl*)evt.GetEventObject();
+    wxCHECK_RET( src_tabs, _T("no source object?") );
+
+    src_tabs->SetCursor(wxCursor(wxCURSOR_ARROW));
+}
+
 wxAuiTabCtrl* wxAuiNotebook::GetTabCtrlFromPoint(const wxPoint& pt)
 {
     // if we've just removed the last tab from the source