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different approach to independent scrolling, involving ArdourCanvas::ScrollGroup

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The idea now is that a scroll group item can be added to the canvas which will causes its children to scroll in either or both
directions (horizontal or vertical). There are few complications: the position() of the ScrollGroup is ambiguous depending
on whether you want it with scroll taken into account or not, so Item::canvas_position() was added, which defaults to
the same value as Item::position() but is overridden by ScrollGroup to return the position independent of scrolling. This
method is used when translating between item/canvas/window coordinate systems.

Note that the basic idea is that we MOVE the scroll group when a scroll happens. This mirrors what happens in the GnomeCanvas,
where Nick Mainsbridge came up with a great idea that allowed unification of the time bar and track canvases.
This commit is contained in:
Paul Davis 2014-05-20 23:08:15 -04:00
parent 6e91e9fd5f
commit cb9453b475
14 changed files with 200 additions and 122 deletions
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15
gtk2_ardour/editor.h
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@ -742,7 +742,20 @@ class Editor : public PublicEditor, public PBD::ScopedConnectionList, public ARD
ArdourCanvas::Group* transport_marker_bar_group;
ArdourCanvas::Group* cd_marker_bar_group;
/* The group containing all trackviews. Only scrolled vertically. */
/* The group containing all other groups that are scrolled vertically
and horizontally.
*/
ArdourCanvas::Group* hv_scroll_group;
/* The group containing all other groups that are scrolled vertically ONLY
*/
ArdourCanvas::Group* v_scroll_group;
/* The group containing all other groups that are scrolled horizontally ONLY
*/
ArdourCanvas::Group* h_scroll_group;
/* The group containing all trackviews. */
ArdourCanvas::Group* _trackview_group;
/* The group used for region motion. Sits on top of _trackview_group */