From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Mon, 20 Aug 2012 13:27:04 +0000 (-0700)
Subject: Avoid changing selection status when collapsing/expanding groups
X-Git-Url: http://git.tdb.fi/?p=ext%2Fsubsurface.git;a=commitdiff_plain;h=5322b4aac11d2a41247a5a86161c1eb7b7983bc2

Avoid changing selection status when collapsing/expanding groups

This tries to avoid the problem mentioned in commit972669d6363c ("Rework
dive selection logic"), where a selection of dives hidden by collapsing
the group gets forgotten about by gtk.  It does so by always marking the
group selected when it is collapsed with any selected children.

We also avoid selecting new children when a group is selected that
already has at least *some* children selected already.  This way we do
minimal damage to existing selections when working with dive group
selections.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/divelist.c b/divelist.c
index 1c475af..13db0a5 100644
--- a/divelist.c
+++ b/divelist.c
@@ -138,6 +138,37 @@ void row_expanded_cb(GtkTreeView *tree_view, GtkTreeIter *iter, GtkTreePath *pat
 	} while (gtk_tree_model_iter_next(model, &child));
 }
 
+static int selected_children(GtkTreeModel *model, GtkTreeIter *iter)
+{
+	GtkTreeIter child;
+
+	if (!gtk_tree_model_iter_children(model, &child, iter))
+		return FALSE;
+
+	do {
+		int idx;
+		struct dive *dive;
+
+		gtk_tree_model_get(model, &child, DIVE_INDEX, &idx, -1);
+		dive = get_dive(idx);
+
+		if (dive->selected)
+			return TRUE;
+	} while (gtk_tree_model_iter_next(model, &child));
+	return FALSE;
+}
+
+/* Make sure that if we collapse a summary row with any selected children, the row
+   shows up as selected too */
+void row_collapsed_cb(GtkTreeView *tree_view, GtkTreeIter *iter, GtkTreePath *path, gpointer data)
+{
+	GtkTreeModel *model = GTK_TREE_MODEL(dive_list.model);
+	GtkTreeSelection *selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(dive_list.tree_view));
+
+	if (selected_children(model, iter))
+		gtk_tree_selection_select_iter(selection, iter);
+}
+
 static GList *selection_changed = NULL;
 
 /*
@@ -179,6 +210,9 @@ static void select_dive_group(GtkTreeModel *model, GtkTreeSelection *selection,
 	int first = 1;
 	GtkTreeIter child;
 
+	if (selected == selected_children(model, iter))
+		return;
+
 	if (!gtk_tree_model_iter_children(model, &child, iter))
 		return;
 
@@ -1296,6 +1330,7 @@ GtkWidget *dive_list_create(void)
 	g_signal_connect_after(dive_list.tree_view, "realize", G_CALLBACK(realize_cb), NULL);
 	g_signal_connect(dive_list.tree_view, "row-activated", G_CALLBACK(row_activated_cb), NULL);
 	g_signal_connect(dive_list.tree_view, "row-expanded", G_CALLBACK(row_expanded_cb), NULL);
+	g_signal_connect(dive_list.tree_view, "row-collapsed", G_CALLBACK(row_collapsed_cb), NULL);
 	g_signal_connect(dive_list.tree_view, "button-press-event", G_CALLBACK(button_press_cb), NULL);
 	g_signal_connect(dive_list.tree_view, "popup-menu", G_CALLBACK(popup_menu_cb), NULL);
 	g_signal_connect(selection, "changed", G_CALLBACK(selection_cb), dive_list.model);