Issue MoonchildProductions/UXP#1578 - Add global menubar support for GTK

1 files changed, 59 insertions, 0 deletions

diff --git a/widget/gtk/nsDbusmenu.cpp b/widget/gtk/nsDbusmenu.cpp
new file mode 100644
index 000000000..2849536e9
--- /dev/null
+++ b/widget/gtk/nsDbusmenu.cpp
@@ -0,0 +1,59 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsDbusmenu.h"
+#include "prlink.h"
+#include "mozilla/ArrayUtils.h"
+
+#define FUNC(name, type, params) \
+nsDbusmenuFunctions::_##name##_fn nsDbusmenuFunctions::s_##name;
+DBUSMENU_GLIB_FUNCTIONS
+DBUSMENU_GTK_FUNCTIONS
+#undef FUNC
+
+static PRLibrary *gDbusmenuGlib = nullptr;
+static PRLibrary *gDbusmenuGtk = nullptr;
+
+typedef void (*nsDbusmenuFunc)();
+struct nsDbusmenuDynamicFunction {
+    const char *functionName;
+    nsDbusmenuFunc *function;
+};
+
+/* static */ nsresult
+nsDbusmenuFunctions::Init() {
+#define FUNC(name, type, params) \
+    { #name, (nsDbusmenuFunc *)&nsDbusmenuFunctions::s_##name },
+    static const nsDbusmenuDynamicFunction kDbusmenuGlibSymbols[] = {
+        DBUSMENU_GLIB_FUNCTIONS
+    };
+    static const nsDbusmenuDynamicFunction kDbusmenuGtkSymbols[] = {
+        DBUSMENU_GTK_FUNCTIONS
+    };
+
+#define LOAD_LIBRARY(symbol, name) \
+    if (!g##symbol) { \
+        g##symbol = PR_LoadLibrary(name); \
+        if (!g##symbol) { \
+            return NS_ERROR_FAILURE; \
+        } \
+    } \
+    for (uint32_t i = 0; i < mozilla::ArrayLength(k##symbol##Symbols); ++i) { \
+        *k##symbol##Symbols[i].function = \
+            PR_FindFunctionSymbol(g##symbol, k##symbol##Symbols[i].functionName); \
+        if (!*k##symbol##Symbols[i].function) { \
+            return NS_ERROR_FAILURE; \
+        } \
+    }
+
+    LOAD_LIBRARY(DbusmenuGlib, "libdbusmenu-glib.so.4")
+#if (MOZ_WIDGET_GTK == 3)
+    LOAD_LIBRARY(DbusmenuGtk, "libdbusmenu-gtk3.so.4")
+#else
+    LOAD_LIBRARY(DbusmenuGtk, "libdbusmenu-gtk.so.4")
+#endif
+#undef LOAD_LIBRARY
+
+    return NS_OK;
+}