Add platform-specific code to allow wxChoice to ellipsize

Fixes https://gitlab.com/kicad/code/kicad/issues/5377

3d-viewer/3d_cache/dialogs/dlg_select_3dmodel.cpp

@@ -35,6 +35,8 @@
 #include <filename_resolver.h>
 #include <pcbnew/class_module.h>
 
+#include <kiplatform/ui.h>
+
 
 DLG_SELECT_3DMODEL::DLG_SELECT_3DMODEL( wxWindow* aParent, S3D_CACHE* aCacheManager,
     MODULE_3D_SETTINGS* aModelItem, wxString& prevModelSelectDir, int& prevModelWildcard ) :
@@ -117,6 +119,12 @@ DLG_SELECT_3DMODEL::DLG_SELECT_3DMODEL( wxWindow* aParent, S3D_CACHE* aCacheMana
         m_FileTree->SetFilterIndex( 0 );
     }
 
+    // Fix the filter box on the file selector widget so that it always shows the start of the filter
+    // string in the combobox. Otherwise it will only show the end of the string, which is empty for
+    // all but the all supported filters option.
+    wxChoice* filterBox = m_FileTree->GetFilterListCtrl();
+    KIPLATFORM::UI::EllipsizeChoiceBox( filterBox );
+
     m_FileTree->SetPath( m_previousDir );
     updateDirChoiceList();
 

libs/kiplatform/gtk/ui.cpp

@@ -20,10 +20,13 @@
 
 #include <kiplatform/ui.h>
 
+#include <wx/choice.h>
 #include <wx/nonownedwnd.h>
 #include <wx/settings.h>
 #include <wx/window.h>
 
+#include <gtk/gtk.h>
+
 
 bool KIPLATFORM::UI::IsDarkTheme()
 {
@@ -68,3 +71,23 @@ bool KIPLATFORM::UI::IsStockCursorOk( wxStockCursor aCursor )
         return false;
     }
 }
+
+
+void KIPLATFORM::UI::EllipsizeChoiceBox( wxChoice* aChoice )
+{
+    // This function is based on the code inside the function post_process_ui in gtkfilechooserwidget.c
+    GList* cells = gtk_cell_layout_get_cells( GTK_CELL_LAYOUT( aChoice->m_widget ) );
+
+    if( !cells )
+        return;
+
+    GtkCellRenderer* cell = (GtkCellRenderer*) cells->data;
+
+    if( !cell )
+        return;
+
+    g_object_set( G_OBJECT( cell ), "ellipsize", PANGO_ELLIPSIZE_END, NULL );
+
+    // Only the list of cells must be freed, the renderer isn't ours to free
+    g_list_free( cells );
+}

libs/kiplatform/include/kiplatform/ui.h

@@ -23,6 +23,7 @@
 
 #include <wx/cursor.h>
 
+class wxChoice;
 class wxNonOwnedWindow;
 class wxWindow;
 
@@ -76,6 +77,14 @@ namespace KIPLATFORM
          * @param aCursor is wxStockCursor we want to see if its acceptable
          */
         bool IsStockCursorOk( wxStockCursor aCursor );
+
+        /**
+         * Configure a wxChoice control to ellipsize the shown text in the button with the ellipses
+         * placed at the end of the string.
+         *
+         * @param aChoice is the choice box to ellipsize
+         */
+        void EllipsizeChoiceBox( wxChoice* aChoice );
     }
 }
 

libs/kiplatform/msw/ui.cpp

@@ -47,7 +47,7 @@ bool KIPLATFORM::UI::IsDarkTheme()
         return false;
 
     long val = 0;
-    
+
     if( !themeKey.QueryValue( lightModeKey, &val ) )
         return false;
 
@@ -88,4 +88,10 @@ bool KIPLATFORM::UI::IsStockCursorOk( wxStockCursor aCursor )
     default:
         return false;
     }
-}
+}
+
+
+void KIPLATFORM::UI::EllipsizeChoiceBox( wxChoice* aChoice )
+{
+    // Not implemented
+}

libs/kiplatform/osx/ui.mm

@@ -84,4 +84,10 @@ bool KIPLATFORM::UI::IsStockCursorOk( wxStockCursor aCursor )
     default:
         return false;
     }
-}
+}
+
+
+void KIPLATFORM::UI::EllipsizeChoiceBox( wxChoice* aChoice )
+{
+    // Not implemented
+}