From 508b6523350b4b1c4b2518b6c8c69e5d161f26c5 Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Fri, 30 May 2008 00:26:07 +0000
Subject: [PATCH] ensure that GetEditControl() returns something even if label
 editing was started by the user and not the program (closes #1325)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@53831 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 include/wx/msw/listctrl.h     |  3 +++
 samples/listctrl/listtest.cpp | 10 +++++++
 src/msw/listctrl.cpp          | 63 +++++++++++++++++++++++++++++++++----------
 3 files changed, 62 insertions(+), 14 deletions(-)

diff --git a/include/wx/msw/listctrl.h b/include/wx/msw/listctrl.h
index 635a0af..8be82a4 100644
--- a/include/wx/msw/listctrl.h
+++ b/include/wx/msw/listctrl.h
@@ -446,6 +446,9 @@ private:
     // UpdateStyle()), only should be called if InReportView()
     void MSWSetExListStyles();
 
+    // initialize the (already created) m_textCtrl with the associated HWND
+    void InitEditControl(WXHWND hWnd);
+
     // destroy m_textCtrl if it's currently valid and reset it to NULL
     void DeleteEditControl();
 
diff --git a/samples/listctrl/listtest.cpp b/samples/listctrl/listtest.cpp
index 23ee183..b969e64 100644
--- a/samples/listctrl/listtest.cpp
+++ b/samples/listctrl/listtest.cpp
@@ -830,6 +830,16 @@ void MyListCtrl::OnBeginRDrag(wxListEvent& event)
 void MyListCtrl::OnBeginLabelEdit(wxListEvent& event)
 {
     wxLogMessage( wxT("OnBeginLabelEdit: %s"), event.m_item.m_text.c_str());
+
+    wxTextCtrl * const text = GetEditControl();
+    if ( !text )
+    {
+        wxLogMessage("BUG: started to edit but no edit control");
+    }
+    else
+    {
+        wxLogMessage("Edit control value: \"%s\"", text->GetValue());
+    }
 }
 
 void MyListCtrl::OnEndLabelEdit(wxListEvent& event)
diff --git a/src/msw/listctrl.cpp b/src/msw/listctrl.cpp
index 16cf30a..239b9b2 100644
--- a/src/msw/listctrl.cpp
+++ b/src/msw/listctrl.cpp
@@ -766,6 +766,25 @@ int wxListCtrl::GetCountPerPage() const
 // Gets the edit control for editing labels.
 wxTextCtrl* wxListCtrl::GetEditControl() const
 {
+    // first check corresponds to the case when the label editing was started
+    // by user and hence m_textCtrl wasn't created by EditLabel() at all, while
+    // the second case corresponds to us being called from inside EditLabel()
+    // (e.g. from a user wxEVT_COMMAND_LIST_BEGIN_LABEL_EDIT handler): in this
+    // case EditLabel() did create the control but it didn't have an HWND to
+    // initialize it with yet
+    if ( !m_textCtrl || !m_textCtrl->GetHWND() )
+    {
+        HWND hwndEdit = ListView_GetEditControl(GetHwnd());
+        if ( hwndEdit )
+        {
+            wxListCtrl * const self = wx_const_cast(wxListCtrl *, this);
+
+            if ( !m_textCtrl )
+                self->m_textCtrl = new wxTextCtrl;
+            self->InitEditControl((WXHWND)hwndEdit);
+        }
+    }
+
     return m_textCtrl;
 }
 
@@ -1455,33 +1474,49 @@ void wxListCtrl::ClearAll()
         DeleteAllColumns();
 }
 
+void wxListCtrl::InitEditControl(WXHWND hWnd)
+{
+    m_textCtrl->SetHWND(hWnd);
+    m_textCtrl->SubclassWin(hWnd);
+    m_textCtrl->SetParent(this);
+
+    // we must disallow TABbing away from the control while the edit contol is
+    // shown because this leaves it in some strange state (just try removing
+    // this line and then pressing TAB while editing an item in  listctrl
+    // inside a panel)
+    m_textCtrl->SetWindowStyle(m_textCtrl->GetWindowStyle() | wxTE_PROCESS_TAB);
+}
+
 wxTextCtrl* wxListCtrl::EditLabel(long item, wxClassInfo* textControlClass)
 {
-    wxASSERT( (textControlClass->IsKindOf(CLASSINFO(wxTextCtrl))) );
+    wxCHECK_MSG( textControlClass->IsKindOf(CLASSINFO(wxTextCtrl)), NULL,
+                  "control used for label editing must be a wxTextCtrl" );
 
     // ListView_EditLabel requires that the list has focus.
     SetFocus();
 
+    // create m_textCtrl here before calling ListView_EditLabel() because it
+    // generates wxEVT_COMMAND_LIST_BEGIN_LABEL_EDIT event from inside it and
+    // the user handler for it can call GetEditControl() resulting in an on
+    // demand creation of a stock wxTextCtrl instead of the control of a
+    // (possibly) custom wxClassInfo
+    DeleteEditControl();
+    m_textCtrl = (wxTextCtrl *)textControlClass->CreateObject();
+
     WXHWND hWnd = (WXHWND) ListView_EditLabel(GetHwnd(), item);
     if ( !hWnd )
     {
         // failed to start editing
+        delete m_textCtrl;
+        m_textCtrl = NULL;
+
         return NULL;
     }
 
-    // [re]create the text control wrapping the HWND we got
-    DeleteEditControl();
-
-    m_textCtrl = (wxTextCtrl *)textControlClass->CreateObject();
-    m_textCtrl->SetHWND(hWnd);
-    m_textCtrl->SubclassWin(hWnd);
-    m_textCtrl->SetParent(this);
-
-    // we must disallow TABbing away from the control while the edit contol is
-    // shown because this leaves it in some strange state (just try removing
-    // this line and then pressing TAB while editing an item in  listctrl
-    // inside a panel)
-    m_textCtrl->SetWindowStyle(m_textCtrl->GetWindowStyle() | wxTE_PROCESS_TAB);
+    // if GetEditControl() hasn't been called, we need to initialize the edit
+    // control ourselves
+    if ( !m_textCtrl->GetHWND() )
+        InitEditControl(hWnd);
 
     return m_textCtrl;
 }
-- 
2.7.4