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avoid recursing through the entire canvas when scrolling - only scroll explicitly identified ScrollGroups

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This commit is contained in:
Paul Davis 2014-05-21 10:25:28 -04:00
parent a551181842
commit c9f890bd7c
3 changed files with 32 additions and 13 deletions
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6
libs/canvas/canvas/canvas.h
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@ -43,6 +43,7 @@ namespace ArdourCanvas
class Rect;
class Group;
class ScrollGroup;
/** The base class for our different types of canvas.
*
@ -108,7 +109,7 @@ public:
}
void scroll_to (Coord x, Coord y);
void set_global_scroll (bool);
void add_scroller (ScrollGroup& i);
virtual Rect visible_area () const = 0;
@ -125,10 +126,11 @@ protected:
RootGroup _root;
Duple _scroll_offset;
bool _global_scroll;
virtual void pick_current_item (int state) = 0;
virtual void pick_current_item (Duple const &, int state) = 0;
std::list<ScrollGroup*> scrollers;
};
/** A canvas which renders onto a GTK EventBox */