Add GNOME implementation for native filesystem icons

This adds some code to support native filesystem icons
on GNOME. It works by resolving gnome libs and gnome-vfs dynamically,
hence we are explicitly running it on GNOME only and not KDE.
Even if it would work there as well. We are planning on adding this
functionality to the platform plugin as well.

Task-number: QTBUG-2195
Reviewed-by: joao

3 files changed, 72 insertions, 0 deletions

diff --git a/src/gui/itemviews/qfileiconprovider.cpp b/src/gui/itemviews/qfileiconprovider.cpp
index 4abdef9..c78a49b 100644
--- a/src/gui/itemviews/qfileiconprovider.cpp
+++ b/src/gui/itemviews/qfileiconprovider.cpp
@@ -54,6 +54,12 @@
 #elif defined(Q_WS_MAC)
 #include <private/qt_cocoa_helpers_mac_p.h>
 #endif
+
+#if defined(Q_WS_X11) && !defined(Q_NO_STYLE_GTK)
+#include <private/qt_x11_p.h>
+#include <private/gtksymbols_p.h>
+#endif
+
 #include <private/qfunctions_p.h>
 
 #ifndef SHGFI_ADDOVERLAYS
@@ -378,6 +384,15 @@ QIcon QFileIconProviderPrivate::getMacIcon(const QFileInfo &fi) const
 QIcon QFileIconProvider::icon(const QFileInfo &info) const
 {
     Q_D(const QFileIconProvider);
+
+#if defined(Q_WS_X11) && !defined(QT_NO_STYLE_GTK)
+    if (X11->desktopEnvironment == DE_GNOME) {
+        QIcon gtkIcon = QGtk::getFilesystemIcon(info);
+        if (!gtkIcon.isNull())
+            return gtkIcon;
+    }
+#endif
+
 #ifdef Q_WS_MAC
     QIcon retIcon = d->getMacIcon(info);
     if (!retIcon.isNull())
diff --git a/src/gui/styles/gtksymbols.cpp b/src/gui/styles/gtksymbols.cpp
index 1cb0ca4..d8f140f 100644
--- a/src/gui/styles/gtksymbols.cpp
+++ b/src/gui/styles/gtksymbols.cpp
@@ -58,6 +58,7 @@
 #include <QtCore/QStringList>
 #include <QtCore/QTextStream>
 #include <QtCore/QHash>
+#include <QtCore/QUrl>
 
 #include <private/qapplication_p.h>
 #include <private/qiconloader_p.h>
@@ -124,6 +125,7 @@ Ptr_gtk_progress_set_adjustment QGtk::gtk_progress_set_adjustment = 0;
 Ptr_gtk_range_set_adjustment QGtk::gtk_range_set_adjustment = 0;
 Ptr_gtk_range_set_inverted QGtk::gtk_range_set_inverted = 0;
 Ptr_gtk_icon_factory_lookup_default QGtk::gtk_icon_factory_lookup_default = 0;
+Ptr_gtk_icon_theme_get_default QGtk::gtk_icon_theme_get_default = 0;
 Ptr_gtk_widget_style_get QGtk::gtk_widget_style_get = 0;
 Ptr_gtk_icon_set_render_icon QGtk::gtk_icon_set_render_icon = 0;
 Ptr_gtk_fixed_new QGtk::gtk_fixed_new = 0;
@@ -196,6 +198,9 @@ Ptr_gconf_client_get_default QGtk::gconf_client_get_default = 0;
 Ptr_gconf_client_get_string QGtk::gconf_client_get_string = 0;
 Ptr_gconf_client_get_bool QGtk::gconf_client_get_bool = 0;
 
+Ptr_gnome_icon_lookup_sync QGtk::gnome_icon_lookup_sync = 0;
+Ptr_gnome_vfs_init QGtk::gnome_vfs_init = 0;
+
 static QString classPath(GtkWidget *widget)
 {
     char* class_path;
@@ -281,6 +286,7 @@ static void resolveGtk()
     QGtk::gtk_range_set_inverted = (Ptr_gtk_range_set_inverted)libgtk.resolve("gtk_range_set_inverted");
     QGtk::gtk_container_add = (Ptr_gtk_container_add)libgtk.resolve("gtk_container_add");
     QGtk::gtk_icon_factory_lookup_default = (Ptr_gtk_icon_factory_lookup_default)libgtk.resolve("gtk_icon_factory_lookup_default");
+    QGtk::gtk_icon_theme_get_default = (Ptr_gtk_icon_theme_get_default)libgtk.resolve("gtk_icon_theme_get_default");
     QGtk::gtk_widget_style_get = (Ptr_gtk_widget_style_get)libgtk.resolve("gtk_widget_style_get");
     QGtk::gtk_icon_set_render_icon = (Ptr_gtk_icon_set_render_icon)libgtk.resolve("gtk_icon_set_render_icon");
     QGtk::gtk_fixed_new = (Ptr_gtk_fixed_new)libgtk.resolve("gtk_fixed_new");
@@ -325,6 +331,9 @@ static void resolveGtk()
     QGtk::pango_font_description_get_weight = (Ptr_pango_font_description_get_weight)libgtk.resolve("pango_font_description_get_weight");
     QGtk::pango_font_description_get_family = (Ptr_pango_font_description_get_family)libgtk.resolve("pango_font_description_get_family");
     QGtk::pango_font_description_get_style = (Ptr_pango_font_description_get_style)libgtk.resolve("pango_font_description_get_style");
+
+    QGtk::gnome_icon_lookup_sync = (Ptr_gnome_icon_lookup_sync)QLibrary::resolve( QLS("gnomeui-2"), 0, "gnome_icon_lookup_sync");
+    QGtk::gnome_vfs_init= (Ptr_gnome_vfs_init)QLibrary::resolve( QLS("gnomevfs-2"), 0, "gnome_vfs_init");
 }
 
 void QGtk::cleanup_gtk_widgets()
@@ -969,6 +978,25 @@ QString QGtk::saveFilename(QWidget *parent, const QString &caption, const QStrin
     return filename;
 }
 
+QIcon QGtk::getFilesystemIcon(const QFileInfo &info)
+{
+    QIcon icon;
+    if (QGtk::gnome_vfs_init && QGtk::gnome_icon_lookup_sync) {
+        QGtk::gnome_vfs_init();
+        GtkIconTheme *theme = QGtk::gtk_icon_theme_get_default();
+        QString fileurl = QUrl::fromLocalFile(info.absoluteFilePath());
+        char * icon_name = QGtk::gnome_icon_lookup_sync(theme,
+                                                        NULL,
+                                                        qPrintable(fileurl),
+                                                        NULL,
+                                                        GNOME_ICON_LOOKUP_FLAGS_NONE,
+                                                        NULL);
+        return QIcon::fromTheme(icon_name);
+        g_free(icon_name);
+    }
+    return icon;
+}
+
 QT_END_NAMESPACE
 
 #endif // !defined(QT_NO_STYLE_GTK)
diff --git a/src/gui/styles/gtksymbols_p.h b/src/gui/styles/gtksymbols_p.h
index 4fb193d..313d948 100644
--- a/src/gui/styles/gtksymbols_p.h
+++ b/src/gui/styles/gtksymbols_p.h
@@ -121,6 +121,7 @@ typedef void (*Ptr_gtk_progress_set_adjustment)(GtkProgress *, GtkAdjustment *);
 typedef void (*Ptr_gtk_range_set_inverted)(GtkRange*, bool);
 typedef void (*Ptr_gtk_container_add)(GtkContainer *container, GtkWidget *widget);
 typedef GtkIconSet* (*Ptr_gtk_icon_factory_lookup_default) (const gchar*);
+typedef GtkIconTheme* (*Ptr_gtk_icon_theme_get_default) (void);
 typedef void (*Ptr_gtk_widget_style_get)(GtkWidget *, const gchar *first_property_name, ...);
 typedef GtkTreeViewColumn* (*Ptr_gtk_tree_view_column_new)(void);
 typedef GtkWidget* (*Ptr_gtk_fixed_new)(void);
@@ -195,6 +196,29 @@ typedef void (*Ptr_gdk_x11_window_set_user_time) (GdkWindow *window, guint32);
 typedef XID  (*Ptr_gdk_x11_drawable_get_xid) (GdkDrawable *);
 typedef Display* (*Ptr_gdk_x11_drawable_get_xdisplay) ( GdkDrawable *);
 
+
+typedef enum {
+  GNOME_ICON_LOOKUP_FLAGS_NONE = 0,
+  GNOME_ICON_LOOKUP_FLAGS_EMBEDDING_TEXT = 1<<0,
+  GNOME_ICON_LOOKUP_FLAGS_SHOW_SMALL_IMAGES_AS_THEMSELVES = 1<<1,
+  GNOME_ICON_LOOKUP_FLAGS_ALLOW_SVG_AS_THEMSELVES = 1<<2
+} GnomeIconLookupFlags;
+
+typedef enum {
+  GNOME_ICON_LOOKUP_RESULT_FLAGS_NONE = 0,
+  GNOME_ICON_LOOKUP_RESULT_FLAGS_THUMBNAIL = 1<<0
+} GnomeIconLookupResultFlags;
+
+struct GnomeThumbnailFactory;
+typedef gboolean (*Ptr_gnome_vfs_init) (void);
+typedef char* (*Ptr_gnome_icon_lookup_sync)  (
+        GtkIconTheme *icon_theme,
+        GnomeThumbnailFactory *,
+        const char *file_uri,
+        const char *custom_icon,
+        GnomeIconLookupFlags flags,
+        GnomeIconLookupResultFlags *result);
+
 QT_BEGIN_NAMESPACE
 
 class QGtk
@@ -219,6 +243,7 @@ public:
                                     QString *selectedFilter, QFileDialog::Options options);
     static QString getGConfString(const QString &key, const QString &fallback = QString());
     static bool getGConfBool(const QString &key, bool fallback = 0);
+    static QIcon getFilesystemIcon(const QFileInfo &);
 
     static Ptr_gtk_container_forall gtk_container_forall;
     static Ptr_gtk_init gtk_init;
@@ -263,6 +288,7 @@ public:
     static Ptr_gtk_range_set_adjustment gtk_range_set_adjustment;
     static Ptr_gtk_range_set_inverted gtk_range_set_inverted;
     static Ptr_gtk_icon_factory_lookup_default gtk_icon_factory_lookup_default;
+    static Ptr_gtk_icon_theme_get_default gtk_icon_theme_get_default;
     static Ptr_gtk_widget_style_get gtk_widget_style_get;
     static Ptr_gtk_icon_set_render_icon gtk_icon_set_render_icon;
     static Ptr_gtk_fixed_new gtk_fixed_new;
@@ -333,6 +359,9 @@ public:
     static Ptr_gconf_client_get_default gconf_client_get_default;
     static Ptr_gconf_client_get_string gconf_client_get_string;
     static Ptr_gconf_client_get_bool gconf_client_get_bool;
+
+    static Ptr_gnome_icon_lookup_sync gnome_icon_lookup_sync;
+    static Ptr_gnome_vfs_init gnome_vfs_init;
 };
 
 // Helper to ensure that we have polished all our gtk widgets