Merge miscellaneous wxDataViewCtrl-related bug fixes

Make it possible to define custom renderers using text controls reacting to
error presses in at least wxMSW and wxGTK.

Closes https://github.com/wxWidgets/wxWidgets/pull/221

include/wx/dvrenderers.h

@@ -180,6 +180,9 @@ public:
     // wxDVR_DEFAULT_ALIGNMENT.
     int GetEffectiveAlignment() const;
 
+    // Send wxEVT_DATAVIEW_ITEM_EDITING_STARTED event.
+    void NotifyEditingStarted(const wxDataViewItem& item);
+
 protected:
     // These methods are called from PrepareForItem() and should do whatever is
     // needed for the current platform to ensure that the item is rendered
@@ -199,7 +202,7 @@ protected:
     wxString                m_variantType;
     wxDataViewColumn       *m_owner;
     wxWeakRef<wxWindow>     m_editorCtrl;
-    wxDataViewItem          m_item; // for m_editorCtrl
+    wxDataViewItem          m_item; // Item being currently edited, if valid.
 
     // internal utility, may be used anywhere the window associated with the
     // renderer is required

include/wx/event.h

@@ -3671,6 +3671,15 @@ protected:
         virtual bool TryParent(wxEvent& event), return DoTryApp(event); )
 #endif // WXWIN_COMPATIBILITY_2_8
 
+    // Overriding this method allows filtering the event handlers dynamically
+    // connected to this object. If this method returns false, the handler is
+    // not connected at all. If it returns true, it is connected using the
+    // possibly modified fields of the given entry.
+    virtual bool OnDynamicBind(wxDynamicEventTableEntry& WXUNUSED(entry))
+    {
+        return true;
+    }
+
 
     static const wxEventTable sm_eventTable;
     virtual const wxEventTable *GetEventTable() const;

include/wx/msw/textctrl.h

@@ -181,7 +181,10 @@ public:
     void OnSetFocus(wxFocusEvent& event);
 
     // intercept WM_GETDLGCODE
-    virtual WXLRESULT MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam);
+    virtual bool MSWHandleMessage(WXLRESULT *result,
+                                  WXUINT message,
+                                  WXWPARAM wParam,
+                                  WXLPARAM lParam);
 
     virtual bool MSWShouldPreProcessMessage(WXMSG* pMsg);
     virtual WXDWORD MSWGetStyle(long style, WXDWORD *exstyle) const;

include/wx/msw/window.h

@@ -14,6 +14,8 @@
 
 #include "wx/settings.h"        // solely for wxSystemColour
 
+class WXDLLIMPEXP_FWD_CORE wxButton;
+
 // if this is set to 1, we use deferred window sizing to reduce flicker when
 // resizing complicated window hierarchies, but this can in theory result in
 // different behaviour than the old code so we keep the possibility to use it
@@ -534,6 +536,16 @@ public:
     virtual wxMenu* MSWFindMenuFromHMENU(WXHMENU hMenu);
 #endif // wxUSE_MENUS && !__WXUNIVERSAL__
 
+    // Return the default button for the TLW containing this window or NULL if
+    // none.
+    static wxButton* MSWGetDefaultButtonFor(wxWindow* win);
+
+    // Simulate a click on the given button if it is non-null, enabled and
+    // shown.
+    //
+    // Return true if the button was clicked, false otherwise.
+    static bool MSWClickButtonIfPossible(wxButton* btn);
+
 protected:
     // this allows you to implement standard control borders without
     // repeating the code in different classes that are not derived from

include/wx/textctrl.h

@@ -743,6 +743,11 @@ public:
     }
 
 protected:
+    // Override wxEvtHandler method to check for a common problem of binding
+    // wxEVT_TEXT_ENTER to a control without wxTE_PROCESS_ENTER style, which is
+    // never going to work.
+    virtual bool OnDynamicBind(wxDynamicEventTableEntry& entry);
+
     // override streambuf method
 #if wxHAS_TEXT_WINDOW_STREAM
     int overflow(int i) wxOVERRIDE;