Remove wxTextCtrl::OnEnabled() hack from wxGTK.

Don't change the background colour when the control is being enabled or
disabled, it doesn't seem necessary and it's unclear why was this added by
r10179 in the first place. It does result in problems however as it could
somehow make the selection of wxTextCtrl invisible when it lost focus and so
fixes a serious usability problem which happened to all wxTextCtrls for which
a wxEVT_UPDATE_UI handler using wxUpdateUIEvent::Enable() was defined.

Closes #14898.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73756 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/textctrl.h

@@ -145,11 +145,6 @@ public:
     GetClassDefaultAttributes(wxWindowVariant variant = wxWINDOW_VARIANT_NORMAL);
 
 protected:
-    // wxGTK-specific: called recursively by Enable,
-    // to give widgets an oppprtunity to correct their colours after they
-    // have been changed by Enable
-    virtual void OnEnabled(bool enable);
-
     // overridden wxWindow virtual methods
     virtual wxSize DoGetBestSize() const;
     virtual void DoApplyWidgetStyle(GtkRcStyle *style);

include/wx/gtk1/textctrl.h

@@ -143,11 +143,6 @@ public:
 
     // implementation only from now on
 
-    // wxGTK-specific: called recursively by Enable,
-    // to give widgets an oppprtunity to correct their colours after they
-    // have been changed by Enable
-    virtual void OnEnabled( bool enabled ) ;
-
     // tell the control to ignore next text changed signal
     void IgnoreNextTextUpdate();
 

include/wx/window.h

@@ -1511,11 +1511,6 @@ protected:
     // widgets state are necessary
     virtual void DoEnable(bool WXUNUSED(enable)) { }
 
-    // called when the on-screen widget state changes and provides an
-    // an opportunity for the widget to update its visual state (colours,
-    // fonts, anything else) as necessary
-    virtual void OnEnabled(bool WXUNUSED(enabled)) { }
-
 
     // the window id - a number which uniquely identifies a window among
     // its siblings unless it is wxID_ANY
@@ -1768,7 +1763,7 @@ protected:
     static void NotifyCaptureLost();
 
 private:
-    // recursively call our own and our children OnEnabled() when the
+    // recursively call our own and our children DoEnable() when the
     // enabled/disabled status changed because a parent window had been
     // enabled/disabled
     void NotifyWindowOnEnableChange(bool enabled);

src/common/wincmn.cpp

@@ -1149,8 +1149,6 @@ void wxWindowBase::NotifyWindowOnEnableChange(bool enabled)
     DoEnable(enabled);
 #endif // !defined(wxHAS_NATIVE_ENABLED_MANAGEMENT)
 
-    OnEnabled(enabled);
-
     // Disabling a top level window is typically done when showing a modal
     // dialog and we don't need to disable its children in this case, they will
     // be logically disabled anyhow (i.e. their IsEnabled() will return false)
@@ -1166,9 +1164,7 @@ void wxWindowBase::NotifyWindowOnEnableChange(bool enabled)
     // they would still show as enabled even though they wouldn't actually
     // accept any input (at least under MSW where children don't accept input
     // if any of the windows in their parent chain is enabled).
-    //
-    // Notice that we must do this even for wxHAS_NATIVE_ENABLED_MANAGEMENT
-    // platforms as we still need to call the children OnEnabled() recursively.
+#ifndef wxHAS_NATIVE_ENABLED_MANAGEMENT
     for ( wxWindowList::compatibility_iterator node = GetChildren().GetFirst();
           node;
           node = node->GetNext() )
@@ -1177,6 +1173,7 @@ void wxWindowBase::NotifyWindowOnEnableChange(bool enabled)
         if ( !child->IsTopLevel() && child->IsThisEnabled() )
             child->NotifyWindowOnEnableChange(enabled);
     }
+#endif // !defined(wxHAS_NATIVE_ENABLED_MANAGEMENT)
 }
 
 bool wxWindowBase::Enable(bool enable)

src/gtk/textctrl.cpp

@@ -1341,26 +1341,6 @@ bool wxTextCtrl::Enable( bool enable )
     return true;
 }
 
-// wxGTK-specific: called recursively by Enable,
-// to give widgets an opportunity to correct their colours after they
-// have been changed by Enable
-void wxTextCtrl::OnEnabled(bool WXUNUSED(enable))
-{
-    // If we have a custom background colour, we use this colour in both
-    // disabled and enabled mode, or we end up with a different colour under the
-    // text.
-    wxColour oldColour = GetBackgroundColour();
-    if (oldColour.IsOk())
-    {
-        // Need to set twice or it'll optimize the useful stuff out
-        if (oldColour == * wxWHITE)
-            SetBackgroundColour(*wxBLACK);
-        else
-            SetBackgroundColour(*wxWHITE);
-        SetBackgroundColour(oldColour);
-    }
-}
-
 void wxTextCtrl::MarkDirty()
 {
     m_modified = true;

src/gtk1/textctrl.cpp

@@ -714,29 +714,6 @@ void wxTextCtrl::DoEnable( bool enable )
     }
 }
 
-// wxGTK-specific: called recursively by Enable,
-// to give widgets an oppprtunity to correct their colours after they
-// have been changed by Enable
-void wxTextCtrl::OnEnabled( bool WXUNUSED(enable) )
-{
-    if ( IsSingleLine() )
-        return;
-
-    // If we have a custom background colour, we use this colour in both
-    // disabled and enabled mode, or we end up with a different colour under the
-    // text.
-    wxColour oldColour = GetBackgroundColour();
-    if (oldColour.IsOk())
-    {
-        // Need to set twice or it'll optimize the useful stuff out
-        if (oldColour == * wxWHITE)
-            SetBackgroundColour(*wxBLACK);
-        else
-            SetBackgroundColour(*wxWHITE);
-        SetBackgroundColour(oldColour);
-    }
-}
-
 void wxTextCtrl::MarkDirty()
 {
     m_modified = true;

src/osx/window_osx.cpp

@@ -1304,7 +1304,6 @@ void wxWindowMac::MacHiliteChanged()
 
 void wxWindowMac::MacEnabledStateChanged()
 {
-    OnEnabled( GetPeer()->IsEnabled() );
 }
 
 //