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/***********************************************************************
* fobject.cpp - Object container base class of all widget objects *
* *
* This file is part of the FINAL CUT widget toolkit *
* *
* Copyright 2015-2022 Markus Gans *
* *
* FINAL CUT is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License as *
* published by the Free Software Foundation; either version 3 of *
* the License, or (at your option) any later version. *
* *
* FINAL CUT is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
***********************************************************************/
#include <algorithm>
#include <memory>
#include "final/fc.h"
#include "final/fevent.h"
#include "final/fobject.h"
namespace finalcut
{
//----------------------------------------------------------------------
// class FObject
//----------------------------------------------------------------------
// constructors and destructor
//----------------------------------------------------------------------
FObject::FObject (FObject* parent)
: parent_obj{parent}
{
if ( parent ) // add object to parent
parent->addChild(this);
}
//----------------------------------------------------------------------
FObject::~FObject() // destructor
{
delOwnTimers(); // Delete all timers of this object
// Delete children objects
if ( hasChildren() )
{
auto delete_list = children_list;
for (auto&& obj : delete_list)
delete obj;
}
if ( parent_obj )
parent_obj->delChild(this);
parent_obj = nullptr;
}
// public methods of FObject
//----------------------------------------------------------------------
auto FObject::getChild (int index) const & -> FObject*
{
// returns the child for the index number
if ( ! hasChildren() )
return nullptr;
if ( index <= 0 || index > int(numOfChildren()) )
return nullptr;
auto iter = children_list.cbegin();
std::advance (iter, index - 1);
return *iter;
}
//----------------------------------------------------------------------
auto FObject::isChild (const FObject* obj) const & -> bool
{
// Find out if obj is a child object of mine
while ( obj )
{
obj = obj->getParent();
if ( obj == this )
return true;
}
return false;
}
//----------------------------------------------------------------------
void FObject::removeParent() &
{
if ( ! hasParent() )
return;
getParent()->delChild(this);
}
//----------------------------------------------------------------------
void FObject::addChild (FObject* obj) &
{
// Adds an object obj to the children list
if ( ! obj )
return;
if ( max_children != UNLIMITED && max_children <= numOfChildren() )
throw std::length_error ("max. child objects reached");
if ( obj->parent_obj )
obj->parent_obj->delChild(obj);
obj->parent_obj = this;
obj->has_parent = true;
children_list.push_back(obj);
}
//----------------------------------------------------------------------
void FObject::delChild (FObject* obj) &
{
// Deletes the child object obj from children list
if ( ! (obj && hasChildren()) )
return;
obj->parent_obj = nullptr;
obj->has_parent = false;
auto end = children_list.end();
auto last = std::remove (children_list.begin(), end, obj);
children_list.erase(last, end);
}
//----------------------------------------------------------------------
void FObject::setParent (FObject* parent) &
{
// Sets a new parent object
if ( ! parent )
return;
removeParent();
parent_obj = parent;
has_parent = true;
parent->children_list.push_back(this);
}
//----------------------------------------------------------------------
auto FObject::event (FEvent* ev) -> bool
{
// Receives events on this object
if ( ev->getType() == Event::Timer )
{
onTimer ( static_cast<FTimerEvent*>(ev) );
}
else if ( ev->getType() == Event::User )
{
onUserEvent ( static_cast<FUserEvent*>(ev) );
}
else
return false;
return true;
}
// protected methods of FObject
//----------------------------------------------------------------------
void FObject::onTimer (FTimerEvent*)
{
// This event handler can be reimplemented in a subclass
// to receive timer events for this object
}
//----------------------------------------------------------------------
void FObject::onUserEvent (FUserEvent*)
{
// This event handler can be reimplemented in a subclass
// to receive user events for this object
}
} // namespace finalcut
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