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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
/*
Sonic Visualiser
An audio file viewer and annotation editor.
Centre for Digital Music, Queen Mary, University of London.
This file copyright 2006 Chris Cannam.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version. See the file
COPYING included with this distribution for more information.
*/
#ifndef SV_EVENT_COMMANDS_H
#define SV_EVENT_COMMANDS_H
#include "base/Event.h"
#include "base/Command.h"
#include "base/ById.h"
namespace sv {
/**
* Interface for classes that can be modified through these commands
*/
class EventEditable
{
public:
virtual ~EventEditable() { }
virtual void add(Event e) = 0;
virtual void remove(Event e) = 0;
};
class WithEditable
{
protected:
WithEditable(int editableId) : m_editableId(editableId) { }
virtual ~WithEditable() { }
std::shared_ptr<EventEditable> getEditable() {
auto editable = AnyById::getAs<EventEditable>(m_editableId);
if (!editable) {
SVCERR << "WARNING: Id passed to EventEditable command is not that of an EventEditable" << endl;
}
return editable;
}
private:
int m_editableId;
};
/**
* Command to add an event to an editable containing events, with
* undo. The id must be that of a type that can be retrieved from the
* AnyById store and dynamic_cast to EventEditable.
*/
class AddEventCommand : public Command,
public WithEditable
{
public:
AddEventCommand(int editableId, const Event &e, QString name) :
WithEditable(editableId), m_event(e), m_name(name) { }
QString getName() const override { return m_name; }
Event getEvent() const { return m_event; }
void execute() override {
auto editable = getEditable();
if (editable) editable->add(m_event);
}
void unexecute() override {
auto editable = getEditable();
if (editable) editable->remove(m_event);
}
private:
Event m_event;
QString m_name;
};
/**
* Command to remove an event from an editable containing events, with
* undo. The id must be that of a type that can be retrieved from the
* AnyById store and dynamic_cast to EventEditable.
*/
class RemoveEventCommand : public Command,
public WithEditable
{
public:
RemoveEventCommand(int editableId, const Event &e, QString name) :
WithEditable(editableId), m_event(e), m_name(name) { }
QString getName() const override { return m_name; }
Event getEvent() const { return m_event; }
void execute() override {
auto editable = getEditable();
if (editable) editable->remove(m_event);
}
void unexecute() override {
auto editable = getEditable();
if (editable) editable->add(m_event);
}
private:
Event m_event;
QString m_name;
};
/**
* Command to add or remove a series of events to or from an editable,
* with undo. Creates and immediately executes a sub-command for each
* add/remove requested. Consecutive add/remove pairs for the same
* point are collapsed. The id must be that of a type that can be
* retrieved from the AnyById store and dynamic_cast to EventEditable.
*/
class ChangeEventsCommand : public MacroCommand
{
public:
ChangeEventsCommand(int editableId, QString name) :
MacroCommand(name), m_editableId(editableId) { }
void add(Event e) {
addCommand(new AddEventCommand(m_editableId, e, getName()), true);
}
void remove(Event e) {
addCommand(new RemoveEventCommand(m_editableId, e, getName()), true);
}
/**
* Stack an arbitrary other command in the same sequence.
*/
void addCommand(Command *command) override { addCommand(command, true); }
/**
* If any points have been added or deleted, return this
* command (so the caller can add it to the command history).
* Otherwise delete the command and return NULL.
*/
ChangeEventsCommand *finish() {
if (!m_commands.empty()) {
return this;
} else {
delete this;
return nullptr;
}
}
protected:
virtual void addCommand(Command *command, bool executeFirst) {
if (executeFirst) command->execute();
if (m_commands.empty()) {
MacroCommand::addCommand(command);
return;
}
RemoveEventCommand *r =
dynamic_cast<RemoveEventCommand *>(command);
AddEventCommand *a =
dynamic_cast<AddEventCommand *>(*m_commands.rbegin());
if (r && a) {
if (a->getEvent() == r->getEvent()) {
deleteCommand(a);
return;
}
}
MacroCommand::addCommand(command);
}
int m_editableId;
};
} // end namespace sv
#endif
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