From 8c3d69509ecdae0b62f895cf99fb04259a407625 Mon Sep 17 00:00:00 2001
From: Patrick McDermott <pj@pehjota.net>
Date: Mon, 23 Oct 2017 16:05:27 -0400
Subject: MqNotebook: Add tab tree popover

---
diff --git a/src/notebook.c b/src/notebook.c
index 48957c9..01f7923 100644
--- a/src/notebook.c
+++ b/src/notebook.c
@@ -44,6 +44,7 @@ struct _MqNotebook {
 	MqTabPage   *find_page;
 	MqTabTree   *found_node;
 	MqTabPage   *current_page;
+	GtkWidget   *tab_tree_popover;
 };
 
 enum {
@@ -132,6 +133,105 @@ new_tab_clicked_cb(GtkWidget G_GNUC_UNUSED *button, MqNotebook *notebook)
 }
 
 static void
+create_tab_tree_model_recurse(MqTabTree *node, GtkTreeStore *tree_store,
+	GtkTreeIter *parent_tree_iter)
+{
+	GtkTreeIter tree_iter;
+
+	for (; node; node = MQ_TAB_TREE(mq_tree_next(node))) {
+		gtk_tree_store_append(tree_store, &tree_iter, parent_tree_iter);
+		gtk_tree_store_set(tree_store, &tree_iter, 0,
+			mq_tab_page_get_title(node->page), -1);
+		create_tab_tree_model_recurse(
+			MQ_TAB_TREE(mq_tree_first_child(node)),
+			tree_store, &tree_iter);
+	}
+}
+
+static GtkTreeModel *
+create_tab_tree_model(MqNotebook *notebook)
+{
+	GtkTreeStore *tree_store;
+
+	tree_store = gtk_tree_store_new(1, G_TYPE_STRING);
+
+	create_tab_tree_model_recurse(
+		MQ_TAB_TREE(mq_tree_first_child(notebook->tree)),
+		tree_store, NULL);
+
+	return GTK_TREE_MODEL(tree_store);
+}
+
+static void
+tab_tree_row_activated_cb(GtkTreeView G_GNUC_UNUSED *tree_view,
+	GtkTreePath *tree_path,
+	GtkTreeViewColumn G_GNUC_UNUSED *tree_view_column, MqNotebook *notebook)
+{
+	gint *indices;
+	gint  depth;
+
+	indices = gtk_tree_path_get_indices_with_depth(tree_path, &depth);
+	g_assert(depth == 1);
+	mq_notebook_set_current_page(notebook, indices[0]);
+	gtk_widget_hide(notebook->tab_tree_popover);
+}
+
+static GtkWidget *
+create_tab_tree_view(MqNotebook *notebook)
+{
+	GtkTreeModel     *tree_model;
+	GtkWidget        *tree_view;
+	GtkTreeSelection *tree_selection;
+	GtkCellRenderer  *cell_renderer;
+
+	tree_model = create_tab_tree_model(notebook);
+	tree_view = gtk_tree_view_new_with_model(tree_model);
+	tree_selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(tree_view));
+	gtk_tree_selection_set_mode(tree_selection, GTK_SELECTION_BROWSE);
+	gtk_tree_selection_select_path(tree_selection,
+		gtk_tree_path_new_from_indices(
+			gtk_notebook_get_current_page(GTK_NOTEBOOK(notebook)),
+			 -1));
+	gtk_tree_view_set_headers_visible(GTK_TREE_VIEW(tree_view), FALSE);
+	gtk_tree_view_set_activate_on_single_click(GTK_TREE_VIEW(tree_view),
+		TRUE);
+	gtk_tree_view_expand_all(GTK_TREE_VIEW(tree_view));
+	gtk_tree_view_set_reorderable(GTK_TREE_VIEW(tree_view), TRUE);
+	gtk_tree_view_set_enable_tree_lines(GTK_TREE_VIEW(tree_view), TRUE);
+	g_signal_connect(tree_view, "row-activated",
+		G_CALLBACK(tab_tree_row_activated_cb), notebook);
+
+	cell_renderer = gtk_cell_renderer_text_new();
+	gtk_tree_view_insert_column_with_attributes(GTK_TREE_VIEW(tree_view),
+		-1, NULL, cell_renderer, "text", 0, NULL);
+
+	return tree_view;
+}
+
+static void
+tab_list_clicked_cb(GtkWidget *button, MqNotebook *notebook)
+{
+	GtkWidget *tab_tree_view;
+	GtkWidget *scrolled_window;
+
+	tab_tree_view = create_tab_tree_view(notebook);
+
+	scrolled_window = gtk_scrolled_window_new(NULL, NULL);
+	gtk_scrolled_window_set_min_content_width(
+		GTK_SCROLLED_WINDOW(scrolled_window), 400);
+	gtk_scrolled_window_set_min_content_height(
+		GTK_SCROLLED_WINDOW(scrolled_window), 200);
+	gtk_container_add(GTK_CONTAINER(scrolled_window), tab_tree_view);
+
+	notebook->tab_tree_popover = gtk_popover_new(button);
+	gtk_container_add(GTK_CONTAINER(notebook->tab_tree_popover),
+		scrolled_window);
+
+	/* NB: gtk_popover_popup() is new in GTK+ 3.22. */
+	gtk_widget_show_all(notebook->tab_tree_popover);
+}
+
+static void
 mq_notebook_init(MqNotebook *notebook)
 {
 	GtkWidget *new_tab_button;
@@ -162,6 +262,8 @@ mq_notebook_init(MqNotebook *notebook)
 	gtk_notebook_set_action_widget(GTK_NOTEBOOK(notebook), tab_list_button,
 		GTK_PACK_END);
 	gtk_widget_show_all(tab_list_button);
+	g_signal_connect(tab_list_button, "clicked",
+		G_CALLBACK(tab_list_clicked_cb), notebook);
 
 	g_signal_connect(notebook, "switch-page",
 		G_CALLBACK(switch_page_cb), NULL);
--
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