Bind the mouse back button on the view

fastiv-view.c

@@ -100,7 +100,7 @@ fastiv_view_realize(GtkWidget *widget)
 		// than what we get automatically.
 		.visual = gtk_widget_get_visual(widget),
 		.event_mask = gtk_widget_get_events(widget) | GDK_SCROLL_MASK |
-			GDK_KEY_PRESS_MASK,
+			GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK,
 	};
 
 	// We need this window to receive input events at all.
@@ -169,6 +169,8 @@ fastiv_view_draw(GtkWidget *widget, cairo_t *cr)
 	return TRUE;
 }
 
+#define SCALE_STEP 1.4
+
 static gboolean
 fastiv_view_scroll_event(GtkWidget *widget, GdkEventScroll *event)
 {
@@ -178,11 +180,11 @@ fastiv_view_scroll_event(GtkWidget *widget, GdkEventScroll *event)
 
 	switch (event->direction) {
 	case GDK_SCROLL_UP:
-		self->scale *= 1.4;
+		self->scale *= SCALE_STEP;
 		gtk_widget_queue_resize(widget);
 		return TRUE;
 	case GDK_SCROLL_DOWN:
-		self->scale /= 1.4;
+		self->scale /= SCALE_STEP;
 		gtk_widget_queue_resize(widget);
 		return TRUE;
 	default:
@@ -202,6 +204,14 @@ fastiv_view_key_press_event(GtkWidget *widget, GdkEventKey *event)
 		self->scale = 1;
 		gtk_widget_queue_resize(widget);
 		return TRUE;
+	case GDK_KEY_plus:
+		self->scale *= SCALE_STEP;
+		gtk_widget_queue_resize(widget);
+		return TRUE;
+	case GDK_KEY_minus:
+		self->scale /= SCALE_STEP;
+		gtk_widget_queue_resize(widget);
+		return TRUE;
 	}
 	return FALSE;
 }

fastiv.c

@@ -317,6 +317,17 @@ on_key_press_view(G_GNUC_UNUSED GtkWidget *widget, GdkEventKey *event,
 	return FALSE;
 }
 
+static gboolean
+on_button_press_view(G_GNUC_UNUSED GtkWidget *widget, GdkEventButton *event)
+{
+	if (!(event->state & gtk_accelerator_get_default_mod_mask()) &&
+		event->button == 8 /* back */) {
+		gtk_stack_set_visible_child(GTK_STACK(g.stack), g.browser_scroller);
+		return TRUE;
+	}
+	return FALSE;
+}
+
 int
 main(int argc, char *argv[])
 {
@@ -377,6 +388,8 @@ main(int argc, char *argv[])
 	gtk_widget_set_hexpand(g.view, TRUE);
 	g_signal_connect(g.view, "key-press-event",
 		G_CALLBACK(on_key_press_view), NULL);
+	g_signal_connect(g.view, "button-press-event",
+		G_CALLBACK(on_button_press_view), NULL);
 	gtk_container_add(GTK_CONTAINER(g.view_scroller), g.view);
 	gtk_widget_show_all(g.view_scroller);