ardour/livetrax
13
0
Fork 0
Code

add new API to PBD::Controllable, ::get_save_value()

Browse Source 
Designed to allow derived classes to *save* a different value
than would be reported by ::get_value().

Specifically there so that slaved controls can save/restore
their *own* state, not the value that ::get_value() would
return.
This commit is contained in:
Paul Davis 2017-02-06 16:41:15 +01:00
parent edd1061c3d
commit 5d5d9b8114
2 changed files with 8 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
libs/pbd/controllable.cc
View File

@ -124,7 +124,7 @@ Controllable::get_state ()
id().print (buf, sizeof (buf));
node->add_property (X_("id"), buf);
node->add_property (X_("flags"), enum_2_string (_flags));
snprintf (buf, sizeof (buf), "%2.12f", get_value());
snprintf (buf, sizeof (buf), "%2.12f", get_save_value());
node->add_property (X_("value"), buf);
if (_extra_xml) {
@ -134,7 +134,6 @@ Controllable::get_state ()
return *node;
}
int
Controllable::set_state (const XMLNode& node, int /*version*/)
{

7
libs/pbd/pbd/controllable.h
View File

@ -104,6 +104,13 @@ class LIBPBD_API Controllable : public PBD::StatefulDestructible {
virtual void set_value (double, GroupControlDisposition group_override) = 0;
virtual double get_value (void) const = 0;
/** This is used when saving state. By default it just calls
* get_value(), but a class with more complex semantics might override
* this to save some value that differs from what get_value() would
* return.
*/
virtual double get_save_value () const { return get_value(); }
/** Conversions between `internal', 'interface', and 'user' values */
virtual double internal_to_interface (double i) const {return (i-lower())/(upper() - lower());} //by default, the interface range is just a linear interpolation between lower and upper values
virtual double interface_to_internal (double i) const {return lower() + i*(upper() - lower());}