[geany/geany] 417dd0: Add ability to scroll over document tabs

[Luke Horwell]

Branch:      refs/heads/master
Author:      Luke Horwell <code at horwell.me>
Committer:   Luke Horwell <code at horwell.me>
Date:        Mon, 11 Apr 2022 10:24:43 UTC
Commit:      417dd007255b2fbe1307b698c3f5c39d9de5eda3
             https://github.com/geany/geany/commit/417dd007255b2fbe1307b698c3f5c39d9de5eda3

Log Message:
-----------
Add ability to scroll over document tabs

This commit reimplements a feature that GTK3 removed a long time ago.
Only concerns the main document tabs.

Addresses #872.

Based on this commit for MATE Caja (GPLv2):
https://github.com/mate-desktop/caja/commit/0b4c7a6b8c25afb987d08bfd2c4c9be57de23960


Modified Paths:
--------------
    src/notebook.c

Modified: src/notebook.c
34 lines changed, 34 insertions(+), 0 deletions(-)
===================================================================
@@ -544,6 +544,33 @@ static gboolean notebook_tab_bar_click_cb(GtkWidget *widget, GdkEventButton *eve
 }
 
 
+static gboolean notebook_tab_bar_scroll_cb(GtkWidget *widget, GdkEventScroll *event)
+{
+	GtkNotebook *notebook = GTK_NOTEBOOK(widget);
+	GtkWidget *child;
+
+	child = gtk_notebook_get_nth_page(notebook, gtk_notebook_get_current_page(notebook));
+	if (child == NULL)
+		return FALSE;
+
+	switch (event->direction)
+	{
+		case GDK_SCROLL_RIGHT:
+		case GDK_SCROLL_DOWN:
+			gtk_notebook_next_page(notebook);
+			break;
+		case GDK_SCROLL_LEFT:
+		case GDK_SCROLL_UP:
+			gtk_notebook_prev_page(notebook);
+			break;
+		default:
+			break;
+	}
+
+	return TRUE;
+}
+
+
 void notebook_init(void)
 {
 	g_signal_connect_after(main_widgets.notebook, "button-press-event",
@@ -558,6 +585,9 @@ void notebook_init(void)
 	g_signal_connect(geany_object, "document-close",
 		G_CALLBACK(on_document_close), NULL);
 
+	gtk_widget_add_events(main_widgets.notebook, GDK_SCROLL_MASK);
+	g_signal_connect(main_widgets.notebook, "scroll-event", G_CALLBACK(notebook_tab_bar_scroll_cb), NULL);
+
 	/* in case the switch dialog misses an event while drawing the dialog */
 	g_signal_connect(main_widgets.window, "key-release-event", G_CALLBACK(on_key_release_event), NULL);
 
@@ -693,6 +723,10 @@ gint notebook_new_tab(GeanyDocument *this)
 	g_signal_connect_after(ebox, "button-release-event",
 		G_CALLBACK(focus_sci), NULL);
 
+    /* switch tab by scrolling - GTK2 behaviour for GTK3 */
+	gtk_widget_add_events(GTK_WIDGET(ebox), GDK_SCROLL_MASK);
+	gtk_widget_add_events(GTK_WIDGET(this->priv->tab_label), GDK_SCROLL_MASK);
+
 	hbox = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 2);
 	gtk_box_pack_start(GTK_BOX(hbox), this->priv->tab_label, FALSE, FALSE, 0);
 	gtk_container_add(GTK_CONTAINER(ebox), hbox);



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