Fix the alignment used by custom wxDVC renderers in wxGTK by default.

Correctly initialize the alignment used by the text renderer used by
wxDataViewCustomRenderer in wxGTK implementation of wxDataViewCtrl.

Closes #12298.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@68323 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/dvrenderer.h

@@ -52,7 +52,7 @@ public:
 
     GtkCellRenderer* GetGtkHandle() { return m_renderer; }
     void GtkInitHandlers();
-    void GtkUpdateAlignment();
+    void GtkUpdateAlignment() { GtkApplyAlignment(m_renderer); }
 
     // should be overridden to return true if the renderer supports properties
     // corresponding to wxDataViewItemAttr field, see wxGtkTreeCellDataFunc()
@@ -85,6 +85,9 @@ protected:
                                   const wxDataViewItem& item,
                                   unsigned col);
 
+    // Apply our effective alignment (i.e. m_alignment if specified or the
+    // associated column alignment by default) to the given renderer.
+    void GtkApplyAlignment(GtkCellRenderer *renderer);
 
     GtkCellRenderer    *m_renderer;
     int                 m_alignment;

include/wx/gtk/dvrenderers.h

@@ -147,6 +147,10 @@ protected:
     bool Init(wxDataViewCellMode mode, int align);
 
 private:
+    // Called from GtkGetTextRenderer() to really create the renderer if
+    // necessary.
+    void GtkInitTextRenderer();
+
     wxDC        *m_dc;
 
     GtkCellRendererText      *m_text_renderer;

src/gtk/dataview.cpp

@@ -1835,7 +1835,7 @@ wxDataViewCellMode wxDataViewRenderer::GetMode() const
     return ret;
 }
 
-void wxDataViewRenderer::GtkUpdateAlignment()
+void wxDataViewRenderer::GtkApplyAlignment(GtkCellRenderer *renderer)
 {
     int align = m_alignment;
 
@@ -1861,7 +1861,7 @@ void wxDataViewRenderer::GtkUpdateAlignment()
     GValue gvalue = { 0, };
     g_value_init( &gvalue, G_TYPE_FLOAT );
     g_value_set_float( &gvalue, xalign );
-    g_object_set_property( G_OBJECT(m_renderer), "xalign", &gvalue );
+    g_object_set_property( G_OBJECT(renderer), "xalign", &gvalue );
     g_value_unset( &gvalue );
 
     // vertical alignment:
@@ -1875,7 +1875,7 @@ void wxDataViewRenderer::GtkUpdateAlignment()
     GValue gvalue2 = { 0, };
     g_value_init( &gvalue2, G_TYPE_FLOAT );
     g_value_set_float( &gvalue2, yalign );
-    g_object_set_property( G_OBJECT(m_renderer), "yalign", &gvalue2 );
+    g_object_set_property( G_OBJECT(renderer), "yalign", &gvalue2 );
     g_value_unset( &gvalue2 );
 }
 
@@ -2359,14 +2359,20 @@ wxDataViewCustomRenderer::wxDataViewCustomRenderer( const wxString &varianttype,
         Init(mode, align);
 }
 
+void wxDataViewCustomRenderer::GtkInitTextRenderer()
+{
+    m_text_renderer = GTK_CELL_RENDERER_TEXT(gtk_cell_renderer_text_new());
+    g_object_ref_sink(m_text_renderer);
+
+    GtkApplyAlignment(GTK_CELL_RENDERER(m_text_renderer));
+}
+
 GtkCellRendererText *wxDataViewCustomRenderer::GtkGetTextRenderer() const
 {
     if ( !m_text_renderer )
     {
         // we create it on demand so need to do it even from a const function
-        const_cast<wxDataViewCustomRenderer *>(this)->
+        const_cast<wxDataViewCustomRenderer *>(this)->GtkInitTextRenderer();
-        m_text_renderer = GTK_CELL_RENDERER_TEXT(gtk_cell_renderer_text_new());
-        g_object_ref_sink(m_text_renderer);
     }
 
     return m_text_renderer;