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in Canvas::window_to_canvas(), if either x or y coordinate is less than zero, search for the scroll group on the relevant edge.

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If we don't do this then we find no scroll group covering the event coordinate, and the translation for scroll fails to be applied
This commit is contained in:
Paul Davis 2014-06-27 10:19:21 -04:00
parent 1983bae513
commit f22f5725d5
1 changed files with 14 additions and 1 deletions
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15
libs/canvas/canvas.cc
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@ -231,8 +231,21 @@ Canvas::window_to_canvas (Duple const & d) const
std::list<Item*> const& root_children (_root.items());
ScrollGroup* sg = 0;
/* if the coordinates are negative, clamp to zero and find the item
* that covers that "edge" position.
*/
Duple in_window (d);
if (in_window.x < 0) {
in_window.x = 0;
}
if (in_window.y < 0) {
in_window.y = 0;
}
for (std::list<Item*>::const_iterator i = root_children.begin(); i != root_children.end(); ++i) {
if (((sg = dynamic_cast<ScrollGroup*>(*i)) != 0) && sg->covers_window (d)) {
if (((sg = dynamic_cast<ScrollGroup*>(*i)) != 0) && sg->covers_window (in_window)) {
break;
}
}