Implement setting link colours in wxHyperlinkCtrl for GTK+3

Use GtkCssProvider to customize the colours used.

Closes #17089.

docs/changes.txt

@@ -67,6 +67,10 @@ All (GUI):
 
 - Update Scintilla to v3.6.3 (Paul Kulchenko).
 
+wxGTK:
+
+- Implement setting link colours in wxHyperlinkCtrl for GTK+3 (Hanmac).
+
 wxMSW:
 
 - Fix crash when using wxCHMHelpController() in 64 bit builds (Xlord2).

include/wx/gtk/hyperlink.h

@@ -13,6 +13,12 @@
 
 #include "wx/generic/hyperlink.h"
 
+#include "wx/scopedptr.h"
+
+#ifdef __WXGTK3__
+class wxHyperlinkCtrlColData;
+#endif
+
 // ----------------------------------------------------------------------------
 // wxHyperlinkCtrl
 // ----------------------------------------------------------------------------
@@ -72,6 +78,19 @@ protected:
 
     virtual GdkWindow *GTKGetWindow(wxArrayGdkWindows& windows) const wxOVERRIDE;
 
+private:
+    enum LinkKind
+    {
+        Link_Normal,
+        Link_Visited
+    };
+
+    void DoSetLinkColour(LinkKind linkKind, const wxColour& colour);
+
+#ifdef __WXGTK3__
+    wxScopedPtr<wxHyperlinkCtrlColData> m_colData;
+#endif
+
     wxDECLARE_DYNAMIC_CLASS(wxHyperlinkCtrl);
 };
 

src/gtk/hyperlink.cpp

@@ -32,6 +32,10 @@
 #include <gtk/gtk.h>
 #include "wx/gtk/private.h"
 
+#ifdef __WXGTK3__
+    #include "wx/gtk/private/object.h"
+#endif
+
 // ----------------------------------------------------------------------------
 // local functions
 // ----------------------------------------------------------------------------
@@ -85,6 +89,23 @@ static void clicked_hook(GtkLinkButton* button, const char*, void*)
 }
 #endif
 
+#ifdef __WXGTK3__
+
+// Used to store GtkCssProviders we need to change the link colours with GTK+3.
+class wxHyperlinkCtrlColData
+{
+public:
+    wxHyperlinkCtrlColData() :
+        m_normalLinkCssProvider(gtk_css_provider_new()),
+        m_visitedLinkCssProvider(gtk_css_provider_new())
+    {}
+
+    wxGtkObject<GtkCssProvider> m_normalLinkCssProvider;
+    wxGtkObject<GtkCssProvider> m_visitedLinkCssProvider;
+};
+
+#endif // __WXGTK3__
+
 // ----------------------------------------------------------------------------
 // wxHyperlinkCtrl
 // ----------------------------------------------------------------------------
@@ -197,12 +218,45 @@ wxString wxHyperlinkCtrl::GetURL() const
     return wxGenericHyperlinkCtrl::GetURL();
 }
 
+void wxHyperlinkCtrl::DoSetLinkColour(LinkKind linkKind, const wxColour& colour)
+{
+#ifdef __WXGTK3__
+    if ( !m_colData )
+        m_colData.reset(new wxHyperlinkCtrlColData());
+
+    const char* cssProp = NULL;
+    GtkCssProvider* cssProvider = NULL;
+    switch ( linkKind )
+    {
+        case Link_Normal:
+            cssProp = "link-color";
+            cssProvider = m_colData->m_normalLinkCssProvider;
+            break;
+
+        case Link_Visited:
+            cssProp = "visited-link-color";
+            cssProvider = m_colData->m_visitedLinkCssProvider;
+            break;
+    }
+
+    wxCHECK_RET( cssProvider, wxS("unknown link kind") );
+
+    const GdkRGBA *col = colour;
+
+    wxGtkString
+        css(g_strdup_printf("* { %s: %s; }", cssProp, gdk_rgba_to_string(col)));
+    ApplyCssStyle(cssProvider, css);
+#else // !__WXGTK3__
+    // simply do nothing: GTK+ does not allow us to change it :(
+    wxUnusedVar(linkKind);
+    wxUnusedVar(colour);
+#endif
+}
+
 void wxHyperlinkCtrl::SetNormalColour(const wxColour &colour)
 {
     if ( UseNative() )
-    {
-        // simply do nothing: GTK+ does not allow us to change it :(
-    }
+        DoSetLinkColour(Link_Normal, colour);
     else
         wxGenericHyperlinkCtrl::SetNormalColour(colour);
 }
@@ -212,6 +266,16 @@ wxColour wxHyperlinkCtrl::GetNormalColour() const
     wxColour ret;
     if ( UseNative() )
     {
+#ifdef __WXGTK3__
+        GdkRGBA *link_color = NULL;
+        gtk_widget_style_get(m_widget, "link-color", &link_color, NULL);
+
+        if ( link_color )
+        {
+            ret = wxColour(*link_color);
+            gdk_rgba_free (link_color);
+        }
+#else // !__WXGTK3__
         GdkColor* link_color;
         GdkColor color = { 0, 0, 0, 0xeeee };
 
@@ -226,6 +290,7 @@ wxColour wxHyperlinkCtrl::GetNormalColour() const
         }
         wxGCC_WARNING_RESTORE()
         ret = wxColour(color);
+#endif // __WXGTK3__/!__WXGTK3__
     }
     else
         ret = wxGenericHyperlinkCtrl::GetNormalColour();
@@ -237,7 +302,7 @@ void wxHyperlinkCtrl::SetVisitedColour(const wxColour &colour)
 {
     if ( UseNative() )
     {
-        // simply do nothing: GTK+ does not allow us to change it :(
+        DoSetLinkColour(Link_Visited, colour);
     }
     else
         wxGenericHyperlinkCtrl::SetVisitedColour(colour);
@@ -248,6 +313,16 @@ wxColour wxHyperlinkCtrl::GetVisitedColour() const
     wxColour ret;
     if ( UseNative() )
     {
+#ifdef __WXGTK3__
+        GdkRGBA *link_color = NULL;
+        gtk_widget_style_get(m_widget, "visited-link-color", &link_color, NULL);
+
+        if ( link_color )
+        {
+            ret = wxColour(*link_color);
+            gdk_rgba_free (link_color);
+        }
+#else // !__WXGTK3__
         GdkColor* link_color;
         GdkColor color = { 0, 0x5555, 0x1a1a, 0x8b8b };
 
@@ -262,6 +337,7 @@ wxColour wxHyperlinkCtrl::GetVisitedColour() const
         }
         wxGCC_WARNING_RESTORE()
         ret = wxColour(color);
+#endif // __WXGTK3__/!__WXGTK3__
     }
     else
         ret = base_type::GetVisitedColour();