Bug 1320686 - [nsLookAndFeel] Get styles for menu label, button text and combobox text colors from WidgetCache. r=karlt

--HG--
extra : rebase_source : 5eb0800de3da5ebb6e2deb1095c50aa218afd6e3

widget/gtk/nsLookAndFeel.cpp

@@ -1153,22 +1153,17 @@ nsLookAndFeel::Init()
     sInfoText = GDK_RGBA_TO_NS_RGBA(color);
     ReleaseStyleContext(style);
 
-    // menu foreground & menu background
-    GtkWidget *accel_label = gtk_accel_label_new("M");
-    GtkWidget *menuitem = gtk_menu_item_new();
-    GtkWidget *menu = gtk_menu_new();
-
-    g_object_ref_sink(menu);
-
-    gtk_container_add(GTK_CONTAINER(menuitem), accel_label);
-    gtk_menu_shell_append(GTK_MENU_SHELL(menu), menuitem);
-
-    style = gtk_widget_get_style_context(accel_label);
-    gtk_style_context_get_color(style, GTK_STATE_FLAG_NORMAL, &color);
-    sMenuText = GDK_RGBA_TO_NS_RGBA(color);
-    gtk_style_context_get_color(style, GTK_STATE_FLAG_INSENSITIVE, &color);
-    sMenuTextInactive = GDK_RGBA_TO_NS_RGBA(color);
-    g_object_unref(menu);
+    style = ClaimStyleContext(MOZ_GTK_MENUITEM);
+    {
+        GtkStyleContext* accelStyle =
+            CreateStyleForWidget(gtk_accel_label_new("M"), style);
+        gtk_style_context_get_color(accelStyle, GTK_STATE_FLAG_NORMAL, &color);
+        sMenuText = GDK_RGBA_TO_NS_RGBA(color);
+        gtk_style_context_get_color(accelStyle, GTK_STATE_FLAG_INSENSITIVE, &color);
+        sMenuTextInactive = GDK_RGBA_TO_NS_RGBA(color);
+        g_object_unref(accelStyle);
+    }
+    ReleaseStyleContext(style);
 
     style = ClaimStyleContext(MOZ_GTK_MENUPOPUP);
     gtk_style_context_get_background_color(style, GTK_STATE_FLAG_NORMAL, &color);
@@ -1191,9 +1186,6 @@ nsLookAndFeel::Init()
     GtkWidget *combobox = gtk_combo_box_new();
     GtkWidget *comboboxLabel = gtk_label_new("M");
     gtk_container_add(GTK_CONTAINER(combobox), comboboxLabel);
-#else
-    GtkWidget *combobox = gtk_combo_box_new_with_entry();
-    GtkWidget *comboboxLabel = gtk_bin_get_child(GTK_BIN(combobox));
 #endif
     GtkWidget *window = gtk_window_new(GTK_WINDOW_POPUP);
     GtkWidget *treeView = gtk_tree_view_new();
@@ -1207,7 +1199,9 @@ nsLookAndFeel::Init()
     gtk_container_add(GTK_CONTAINER(parent), button);
     gtk_container_add(GTK_CONTAINER(parent), treeView);
     gtk_container_add(GTK_CONTAINER(parent), linkButton);
+#if (MOZ_WIDGET_GTK == 2)
     gtk_container_add(GTK_CONTAINER(parent), combobox);
+#endif
     gtk_container_add(GTK_CONTAINER(parent), menuBar);
     gtk_menu_shell_append(GTK_MENU_SHELL(menuBar), menuBarItem);
     gtk_container_add(GTK_CONTAINER(window), parent);
@@ -1307,17 +1301,24 @@ nsLookAndFeel::Init()
     sTextSelectedText = GDK_RGBA_TO_NS_RGBA(color);
     ReleaseStyleContext(style);
 
-    // Button text, background, border
-    style = gtk_widget_get_style_context(label);
-    gtk_style_context_get_color(style, GTK_STATE_FLAG_NORMAL, &color);
-    sButtonText = GDK_RGBA_TO_NS_RGBA(color);
-    gtk_style_context_get_color(style, GTK_STATE_FLAG_PRELIGHT, &color);
-    sButtonHoverText = GDK_RGBA_TO_NS_RGBA(color);
+    // Button text color
+    style = ClaimStyleContext(MOZ_GTK_BUTTON);
+    {
+        GtkStyleContext* labelStyle =
+            CreateStyleForWidget(gtk_label_new("M"), style);
+        gtk_style_context_get_color(labelStyle, GTK_STATE_FLAG_NORMAL, &color);
+        sButtonText = GDK_RGBA_TO_NS_RGBA(color);
+        gtk_style_context_get_color(labelStyle, GTK_STATE_FLAG_PRELIGHT, &color);
+        sButtonHoverText = GDK_RGBA_TO_NS_RGBA(color);
+        g_object_unref(labelStyle);
+    }
+    ReleaseStyleContext(style);
 
     // Combobox text color
-    style = gtk_widget_get_style_context(comboboxLabel);
+    style = ClaimStyleContext(MOZ_GTK_COMBOBOX_ENTRY_TEXTAREA);
     gtk_style_context_get_color(style, GTK_STATE_FLAG_NORMAL, &color);
     sComboBoxText = GDK_RGBA_TO_NS_RGBA(color);
+    ReleaseStyleContext(style);
 
     // Menubar text and hover text colors    
     style = ClaimStyleContext(MOZ_GTK_MENUBARITEM);