[ghex] tab: Implement middle-click-to-close gesture

[Logan Rathbone <larathbone src gnome org>]

commit eebf66bb2b2bca20ba8f41c3d049821cca68611b
Author: Logan Rathbone <poprocks gmail com>
Date:   Tue May 3 18:21:30 2022 -0400

    tab: Implement middle-click-to-close gesture

 src/ghex-notebook-tab.c | 26 +++++++++++++++++---------
 1 file changed, 17 insertions(+), 9 deletions(-)
---
diff --git a/src/ghex-notebook-tab.c b/src/ghex-notebook-tab.c
index 79e4e51..5c1657e 100644
--- a/src/ghex-notebook-tab.c
+++ b/src/ghex-notebook-tab.c
@@ -79,14 +79,9 @@ ghex_notebook_tab_document_changed_cb (HexDocument *doc,
 }
 
 static void
-ghex_notebook_tab_close_click_cb (GtkButton *button,
-               gpointer   user_data)
+emit_close_request (GHexNotebookTab *self)
 {
-       GHexNotebookTab *self = GHEX_NOTEBOOK_TAB(user_data);
-
-       g_signal_emit(self,
-                       signals[CLOSE_REQUEST],
-                       0);             /* GQuark detail (just set to 0 if unknown) */
+       g_signal_emit (self, signals[CLOSE_REQUEST], 0);
 }
 
 
@@ -97,6 +92,7 @@ ghex_notebook_tab_init (GHexNotebookTab *self)
 {
        GtkWidget *widget = GTK_WIDGET (self);
        GtkLayoutManager *layout_manager;
+       GtkGesture *gesture;
 
        /* Set spacing between label and close button. */
 
@@ -119,10 +115,22 @@ ghex_notebook_tab_init (GHexNotebookTab *self)
        gtk_widget_set_parent (self->label, widget);
        gtk_widget_set_parent (self->close_btn, widget);
 
+       /* Setup middle click gesture */
+
+       gesture = gtk_gesture_click_new ();
+
+       gtk_gesture_single_set_button (GTK_GESTURE_SINGLE(gesture),
+                       GDK_BUTTON_MIDDLE);
+
+       g_signal_connect_swapped (gesture, "pressed",
+                       G_CALLBACK(emit_close_request), self);
+
+       gtk_widget_add_controller (widget, GTK_EVENT_CONTROLLER(gesture));
+
        /* SIGNALS */
 
-    g_signal_connect (self->close_btn, "clicked",
-                     G_CALLBACK(ghex_notebook_tab_close_click_cb), self);
+    g_signal_connect_swapped (self->close_btn, "clicked",
+                       G_CALLBACK(emit_close_request), self);
 }
 
 static void