fdo#60565 - re-read font data on GtkSettings fontconfig-timestamp notify.

Change-Id: If1c4d3a7754cc35208e40494828a799f94f26afc
Reviewed-on: https://gerrit.libreoffice.org/4347
Reviewed-by: Noel Power <noel.power@suse.com>
Tested-by: Noel Power <noel.power@suse.com>
Reviewed-on: https://gerrit.libreoffice.org/4376

2 files changed, 35 insertions, 6 deletions

diff --git a/vcl/inc/unx/gtk/gtkgdi.hxx b/vcl/inc/unx/gtk/gtkgdi.hxx
index 86003edd94b6..7239d431675f 100644
--- a/vcl/inc/unx/gtk/gtkgdi.hxx
+++ b/vcl/inc/unx/gtk/gtkgdi.hxx
@@ -55,6 +55,8 @@ public:
                                                     Rectangle &rNativeBoundingRegion,
                                                     Rectangle &rNativeContentRegion );
     void updateSettings( AllSettings& rSettings );
+    static void refreshFontconfig( GtkSettings *pSettings );
+    static void signalSettingsNotify( GObject*, GParamSpec *pSpec, gpointer );
 private:
     GtkWidget       *mpWindow;
     static GtkStyleContext *mpButtonStyle;
@@ -139,6 +141,8 @@ public:
 
     //helper methods for frame's UpdateSettings
     void updateSettings( AllSettings& rSettings );
+    static void refreshFontconfig( GtkSettings *pSettings );
+    static void signalSettingsNotify( GObject*, GParamSpec *pSpec, gpointer );
 
     virtual bool            setClipRegion( const Region& );
     virtual void            ResetClipRegion();
diff --git a/vcl/unx/gtk/gdi/salnativewidgets-gtk.cxx b/vcl/unx/gtk/gdi/salnativewidgets-gtk.cxx
index 145585031d74..e4bd038d6007 100755
--- a/vcl/unx/gtk/gdi/salnativewidgets-gtk.cxx
+++ b/vcl/unx/gtk/gdi/salnativewidgets-gtk.cxx
@@ -3710,14 +3710,16 @@ void printStyleColors( GtkStyle* pStyle )
 }
 #endif
 
-void GtkSalGraphics::updateSettings( AllSettings& rSettings )
+void GtkSalGraphics::signalSettingsNotify( GObject *pSettings, GParamSpec *pSpec, gpointer )
 {
-    GdkScreen* pScreen = gtk_widget_get_screen( m_pWindow );
-    gtk_widget_ensure_style( m_pWindow );
-    GtkStyle* pStyle = gtk_widget_get_style( m_pWindow );
-    GtkSettings* pSettings = gtk_widget_get_settings( m_pWindow );
-    StyleSettings aStyleSet = rSettings.GetStyleSettings();
+    g_return_if_fail( pSpec != NULL );
 
+    if( !strcmp( pSpec->name, "gtk-fontconfig-timestamp" ) )
+        GtkSalGraphics::refreshFontconfig( GTK_SETTINGS( pSettings ) );
+}
+
+void GtkSalGraphics::refreshFontconfig( GtkSettings *pSettings )
+{
     guint latest_fontconfig_timestamp = 0;
     static guint our_fontconfig_timestamp = 0;
     g_object_get( pSettings, "gtk-fontconfig-timestamp", &latest_fontconfig_timestamp, (char *)NULL );
@@ -3726,9 +3728,32 @@ void GtkSalGraphics::updateSettings( AllSettings& rSettings )
         bool bFirstTime = our_fontconfig_timestamp == 0;
         our_fontconfig_timestamp = latest_fontconfig_timestamp;
         if (!bFirstTime)
+        {
             psp::PrintFontManager::get().initialize();
+        }
+    }
+}
+
+void GtkSalGraphics::updateSettings( AllSettings& rSettings )
+{
+    GdkScreen* pScreen = gtk_widget_get_screen( m_pWindow );
+    gtk_widget_ensure_style( m_pWindow );
+    GtkStyle* pStyle = gtk_widget_get_style( m_pWindow );
+    GtkSettings* pSettings = gtk_widget_get_settings( m_pWindow );
+    StyleSettings aStyleSet = rSettings.GetStyleSettings();
+
+    // Listen for font changes
+    if( !g_object_get_data( G_OBJECT( pSettings ), "libo:listening" ) )
+    {
+        g_object_set_data( G_OBJECT( pSettings ), "libo:listening",
+                           GUINT_TO_POINTER( 1 ) );
+        g_signal_connect_data( G_OBJECT( pSettings ), "notify",
+                               G_CALLBACK( signalSettingsNotify ),
+                               NULL, NULL, G_CONNECT_AFTER );
     }
 
+    refreshFontconfig( pSettings );
+
     // get the widgets in place
     NWEnsureGTKMenu( m_nXScreen );
     NWEnsureGTKMenubar( m_nXScreen );