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Fix drop location for drag-and-drop in some cases.

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git-svn-id: svn://localhost/ardour2/branches/3.0@8672 d708f5d6-7413-0410-9779-e7cbd77b26cf
This commit is contained in:
Carl Hetherington 2011-02-01 23:21:28 +00:00
parent 6c7d8c6877
commit d3a4b2df74
1 changed files with 22 additions and 4 deletions
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26
libs/gtkmm2ext/gtkmm2ext/dndvbox.h
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@ -312,18 +312,36 @@ private:
{
/* work out where it was dropped */
std::pair<T*, double> const drop = get_child_at_position (y);
if (_drag_source == this) {
/* dropped from ourselves onto ourselves */
T* child = *((T **) selection_data.get_data());
/* reorder child widgets accordingly */
if (drop.first == 0) {
_internal_vbox.reorder_child (child->widget(), -1);
} else {
_internal_vbox.reorder_child (child->widget(), int (drop.second));
/* where in the list this child should be dropped */
int target = drop.second + 0.5;
/* find out whether the child was `picked up' from before the drop position */
int n = 0;
typename std::list<T*>::const_iterator i = _children.begin ();
while (i != _children.end() && *i != child && n < target) {
++i;
++n;
}
/* if so, adjust the drop position to account for this */
if (n < target) {
--target;
}
_internal_vbox.reorder_child (child->widget(), target);
}
} else {