QuadTreeModelBase Class Reference

A non-parameterized abstract base class for quad-tree models. More...

#include <QuadTreeModelBase.h++>

Inheritance diagram for QuadTreeModelBase:

Signals
void	dataChanged ()
	Emitted when the model has changed in some significant way. More...
void	itemAdded (const QPoint &location)
	Emitted when a new item has been added to the model. More...
void	itemModified (const QPoint &location)
	Emitted when an item in the model has changed. More...
void	itemRemoved (const QPoint &location)
	Emitted when an item has been removed from the model. More...

Public Member Functions
virtual	~QuadTreeModelBase ()
	Destructor. More...
QRect	region () const
	Returns the region covered by this model. More...
uint	itemCount () const
	Returns the number of items in the model. More...
bool	isEmpty () const
	Tests if the model is empty. More...
bool	setVisibleRegion (const QRect &visibleRegion)
	Sets the visible region for the model. More...
QRect	visibleRegion () const
	Returns the current visible region. More...

Protected Member Functions
	QuadTreeModelBase (const QRect &region, uint maxItemsPerQuad=1)
	Constructs a QuadTreeModelBase with the given region and density. More...

Protected Attributes
uint	_maxItemsPerQuad
QRect	_region
QRect	_visibleRegion
uint	_itemCount

Detailed Description

A non-parameterized abstract base class for quad-tree models.

This class should not be subclassed directly.

Author

Mark Lindner

Constructor & Destructor Documentation

~QuadTreeModelBase()

virtual ~QuadTreeModelBase ( )

virtual

Destructor.

QuadTreeModelBase()

QuadTreeModelBase ( const QRect &  region, uint  maxItemsPerQuad = 1  )

protected

Constructs a QuadTreeModelBase with the given region and density.

Member Function Documentation

dataChanged

void dataChanged ( )

signal

Emitted when the model has changed in some significant way.

isEmpty()

bool isEmpty ( ) const

inline

Tests if the model is empty.

itemAdded

void itemAdded ( const QPoint &  location )

signal

Emitted when a new item has been added to the model.

Parameters

location

The item's location.

itemCount()

uint itemCount ( ) const

inline

Returns the number of items in the model.

itemModified

void itemModified ( const QPoint &  location )

signal

Emitted when an item in the model has changed.

Parameters

location

The item's location.

itemRemoved

void itemRemoved ( const QPoint &  location )

signal

Emitted when an item has been removed from the model.

Parameters

location

The item's location.

region()

QRect region ( ) const

inline

Returns the region covered by this model.

setVisibleRegion()

bool setVisibleRegion

(

const QRect &

visibleRegion

)

Sets the visible region for the model.

When a data item is added to, removed from, or changed in the model, the corresponding notification signal will only be emitted if that item's location was within the visible region.

Parameters

The	new visible region.

Returns

true on success, or false if the specified region is neither empty nor contained within the model's region.

visibleRegion()

QRect visibleRegion ( ) const

inline

Returns the current visible region.

Member Data Documentation

_itemCount

uint _itemCount

protected

_maxItemsPerQuad

uint _maxItemsPerQuad

protected

_region

QRect _region

protected

_visibleRegion

QRect _visibleRegion

protected

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The documentation for this class was generated from the following file:

• QuadTreeModelBase.h++