IComponentHandler2 Class Reference

Extended host callback interface for an edit controller: Vst::IComponentHandler2. More...

#include <ivsteditcontroller.h>

Inheritance diagram for IComponentHandler2:

Public Member Functions
virtual tresult	setDirty (TBool state)=0
	Tells host that the plug-in is dirty (something besides parameters has changed since last save), if true the host should apply a save before quitting. More...
virtual tresult	requestOpenEditor (FIDString name=ViewType::kEditor)=0
	Tells host that it should open the plug-in editor the next time it's possible. More...
virtual tresult	startGroupEdit ()=0
	Starts the group editing (call before a IComponentHandler::beginEdit), the host will keep the current timestamp at this call and will use it for all IComponentHandler::beginEdit, IComponentHandler::performEdit, IComponentHandler::endEdit calls until a finishGroupEdit (). More...
virtual tresult	finishGroupEdit ()=0
	Finishes the group editing started by a startGroupEdit (call after a IComponentHandler::endEdit). More...
Public Member Functions inherited from FUnknown
virtual tresult	queryInterface (const TUID _iid, void **obj)=0
virtual uint32	addRef ()=0
virtual uint32	release ()=0

Static Public Attributes
static const FUID	iid
Static Public Attributes inherited from FUnknown
static const FUID	iid

Detailed Description

Extended host callback interface for an edit controller: Vst::IComponentHandler2.

• [host imp]
• [extends IComponentHandler]
• [released: 3.1.0]
• [optional]

One part handles:

• Setting dirty state of the plug-in
• Requesting the host to open the editor

The other part handles parameter group editing from the plug-in UI. It wraps a set of IComponentHandler::beginEdit / Steinberg::Vst::IComponentHandler::performEdit / Steinberg::Vst::IComponentHandler::endEdit functions (see IComponentHandler) which should use the same timestamp in the host when writing automation. This allows for better synchronizing of multiple parameter changes at once.

Examples of different use cases

//--------------------------------------
// we are in the editcontroller...
// in case of multiple switch buttons (with associated ParamID 1 and 3)
// on mouse down :
hostHandler2->startGroupEdit ();
hostHandler->beginEdit (1);
hostHandler->beginEdit (3);
hostHandler->performEdit (1, 1.0);
hostHandler->performEdit (3, 0.0); // the opposite of paramID 1 for example
....
// on mouse up :
hostHandler->endEdit (1);
hostHandler->endEdit (3);
hostHandler2->finishGroupEdit ();
....
....
//--------------------------------------
// in case of multiple faders (with associated ParamID 1 and 3)
// on mouse down :
hostHandler2->startGroupEdit ();
hostHandler->beginEdit (1);
hostHandler->beginEdit (3);
hostHandler2->finishGroupEdit ();
....
// on mouse move :
hostHandler2->startGroupEdit ();
hostHandler->performEdit (1, x); // x the wanted value
hostHandler->performEdit (3, x);
hostHandler2->finishGroupEdit ();
....
// on mouse up :
hostHandler2->startGroupEdit ();
hostHandler->endEdit (1);
hostHandler->endEdit (3);
hostHandler2->finishGroupEdit ();

See also

IComponentHandler, IEditController

Member Function Documentation

setDirty()

virtual tresult setDirty ( TBool  state )

pure virtual

Tells host that the plug-in is dirty (something besides parameters has changed since last save), if true the host should apply a save before quitting.

requestOpenEditor()

virtual tresult requestOpenEditor ( FIDString  name = ViewType::kEditor )

pure virtual

Tells host that it should open the plug-in editor the next time it's possible.

You should use this instead of showing an alert and blocking the program flow (especially on loading projects).

startGroupEdit()

virtual tresult startGroupEdit ( )

pure virtual

Starts the group editing (call before a IComponentHandler::beginEdit), the host will keep the current timestamp at this call and will use it for all IComponentHandler::beginEdit, IComponentHandler::performEdit, IComponentHandler::endEdit calls until a finishGroupEdit ().

finishGroupEdit()

virtual tresult finishGroupEdit ( )

pure virtual

Finishes the group editing started by a startGroupEdit (call after a IComponentHandler::endEdit).

Member Data Documentation

iid

const FUID iid

static