Change cursor if mouse is over link

Thanks to MaximeC for the initial patch.
Signed-off-by: Sebastian Ramacher <sebastian+dev@ramacher.at>

callbacks.c

@@ -590,3 +590,16 @@ cb_page_widget_image_selected(ZathuraPage* page, GdkPixbuf* pixbuf, void* data)
 
   g_free(selection);
 }
+
+void
+cb_page_widget_link(ZathuraPage* page, void* data)
+{
+  g_return_if_fail(page != NULL);
+
+  bool enter = (bool) data;
+
+  GdkWindow* window = gtk_widget_get_parent_window(GTK_WIDGET(page));
+  GdkCursor* cursor = gdk_cursor_new(enter == true ? GDK_HAND1 : GDK_LEFT_PTR);
+  gdk_window_set_cursor(window, cursor);
+  g_object_unref(cursor);
+}

callbacks.h

@@ -200,4 +200,8 @@ void cb_page_widget_text_selected(ZathuraPage* page, const char* text,
 void cb_page_widget_image_selected(ZathuraPage* page, GdkPixbuf* pixbuf,
     void* data);
 
+void
+cb_page_widget_link(ZathuraPage* page, void* data);
+
+
 #endif // CALLBACKS_H

page-widget.c

@@ -51,6 +51,7 @@ typedef struct zathura_page_widget_private_s {
       int x; /**< X coordinate */
       int y; /**< Y coordinate */
     } selection_basepoint;
+    bool over_link;
   } mouse;
 } zathura_page_widget_private_t;
 
@@ -94,6 +95,8 @@ enum properties_e {
 enum {
   TEXT_SELECTED,
   IMAGE_SELECTED,
+  ENTER_LINK,
+  LEAVE_LINK,
   LAST_SIGNAL
 };
 
@@ -162,6 +165,26 @@ zathura_page_widget_class_init(ZathuraPageClass* class)
       G_TYPE_NONE,
       1,
       G_TYPE_OBJECT);
+
+  signals[ENTER_LINK] = g_signal_new("enter-link",
+      ZATHURA_TYPE_PAGE,
+      G_SIGNAL_RUN_LAST,
+      0,
+      NULL,
+      NULL,
+      g_cclosure_marshal_generic,
+      G_TYPE_NONE,
+      0);
+
+  signals[LEAVE_LINK] = g_signal_new("leave-link",
+      ZATHURA_TYPE_PAGE,
+      G_SIGNAL_RUN_LAST,
+      0,
+      NULL,
+      NULL,
+      g_cclosure_marshal_generic,
+      G_TYPE_NONE,
+      0);
 }
 
 static void
@@ -737,7 +760,34 @@ cb_zathura_page_widget_motion_notify(GtkWidget* widget, GdkEventMotion* event)
 {
   g_return_val_if_fail(widget != NULL, false);
   g_return_val_if_fail(event != NULL, false);
+
   if ((event->state & GDK_BUTTON1_MASK) == 0) {
+    zathura_page_widget_private_t* priv = ZATHURA_PAGE_GET_PRIVATE(widget);
+    if (priv->links.retrieved == false) {
+      priv->links.list      = zathura_page_links_get(priv->page, NULL);
+      priv->links.retrieved = true;
+      priv->links.n         = (priv->links.list == NULL) ? 0 : girara_list_size(priv->links.list);
+    }
+
+    if (priv->links.list != NULL && priv->links.n > 0) {
+      bool over_link = false;
+      GIRARA_LIST_FOREACH(priv->links.list, zathura_link_t*, iter, link)
+        zathura_rectangle_t rect = recalc_rectangle(priv->page, zathura_link_get_position(link));
+        if (rect.x1 <= event->x && rect.x2 >= event->x && rect.y1 <= event->y && rect.y2 >= event->y) {
+          over_link = true;
+        }
+      GIRARA_LIST_FOREACH_END(priv->links.list, zathura_link_t*, iter, link);
+
+      if (priv->mouse.over_link != over_link) {
+        if (over_link == true) {
+          g_signal_emit(ZATHURA_PAGE(widget), signals[ENTER_LINK], 0);
+        } else {
+          g_signal_emit(ZATHURA_PAGE(widget), signals[LEAVE_LINK], 0);
+        }
+        priv->mouse.over_link = over_link;
+      }
+    }
+
     return false;
   }
 

zathura.c

@@ -783,6 +783,10 @@ document_open(zathura_t* zathura, const char* path, const char* password,
         G_CALLBACK(cb_page_widget_text_selected), zathura);
     g_signal_connect(G_OBJECT(page_widget), "image-selected",
         G_CALLBACK(cb_page_widget_image_selected), zathura);
+    g_signal_connect(G_OBJECT(page_widget), "enter-link",
+        G_CALLBACK(cb_page_widget_link), (gpointer) true);
+    g_signal_connect(G_OBJECT(page_widget), "leave-link",
+        G_CALLBACK(cb_page_widget_link), (gpointer) false);
   }
 
   /* view mode */