Iterators are used to iterate through the contents of a widget. More...

#include <iterator.hh>

Public Member Functions
bool	equals (Object *other)
	Returns, whether two objects are equal. More...

void	intoStringBuffer (lout::misc::StringBuffer *sb)
	Store a textual representation of the object in a misc::StringBuffer. More...

Widget *	getWidget ()

Content *	getContent ()

Content::Type	getMask ()

virtual void	unref ()
	Delete the iterator. More...

virtual bool	next ()=0
	Move iterator forward and store content it. More...

virtual bool	prev ()=0
	Move iterator backward and store content it. More...

virtual void	highlight (int start, int end, HighlightLayer layer)=0
	Extend highlighted region to contain part of the current content. More...

virtual void	unhighlight (int direction, HighlightLayer layer)=0
	Shrink highlighted region to no longer contain the current content. More...

virtual void	getAllocation (int start, int end, Allocation *allocation)=0
	Return the shape, which a part of the item, the iterator points on, allocates. More...

Iterator *	cloneIterator ()

Public Member Functions inherited from lout::object::Comparable
virtual int	compareTo (Comparable *other)=0
	Compare two objects, this and other. More...

Public Member Functions inherited from lout::object::Object
virtual	~Object ()
	The destructor is defined as virtual (but not abstract), so that destruction of Object's works properly. More...

virtual int	hashValue ()
	Return a hash value for the object. More...

virtual Object *	clone ()
	Return an exact copy of the object. More...

const char *	toString ()
	Use object::Object::intoStringBuffer to return a textual representation of the object. More...

virtual size_t	sizeOf ()
	Return the number of bytes, this object totally uses. More...

Static Public Member Functions
static void	scrollTo (Iterator it1, Iterator it2, int start, int end, HPosition hpos, VPosition vpos)
	Scrolls the viewport, so that the region between it1 and it2 is seen, according to hpos and vpos. More...

Protected Member Functions
	Iterator (Widget *widget, Content::Type mask, bool atEnd)

	Iterator (Iterator &it)

	~Iterator ()

Protected Attributes
Content	content

Private Attributes
Widget *	widget

Content::Type	mask

Detailed Description

Iterators are used to iterate through the contents of a widget.

When using iterators, you should care about the results of dw::core::Widget::hasContents.

See also: dw::core::Widget::iterator

Constructor & Destructor Documentation

dw::core::Iterator::Iterator	(	Widget *	widget,
		Content::Type	mask,
		bool	atEnd
	)

protected

dw::core::Iterator::Iterator ( Iterator & it )

protected

References content, and widget.

dw::core::Iterator::~Iterator ( )

protected

Member Function Documentation

Iterator* dw::core::Iterator::cloneIterator ( )

inline

References lout::object::Object::clone().

Referenced by dw::core::DeepIterator::DeepIterator(), and dw::core::DeepIterator::searchSideward().

bool dw::core::Iterator::equals ( Object * other )

virtual

Returns, whether two objects are equal.

The caller should ensure, that this and the object have the same class; this makes casting of "other" safe. Typically, an implementation should check this == other first, the caller can assume a fast implementation.

Reimplemented from lout::object::Object.

References lout::object::Comparable::compareTo(), and getWidget().

Referenced by scrollTo().

virtual void dw::core::Iterator::getAllocation	(	int	start,
		int	end,
		Allocation *	allocation
	)

pure virtual

Return the shape, which a part of the item, the iterator points on, allocates.

The parameters start and end have the same meaning as in DwIterator::highlight().

Implemented in dw::core::TextIterator, dw::core::EmptyIterator, and dw::SimpleContainer::SimpleContainerIterator.

Referenced by dw::core::DeepIterator::getAllocation(), and scrollTo().

Content* dw::core::Iterator::getContent ( )

inline

References content.

Referenced by dw::core::Widget::containerSizeChangedForChildren(), dw::core::SelectionState::copy(), dw::core::SelectionState::correctCharPos(), dw::core::DeepIterator::DeepIterator(), dw::core::Layout::detachWidget(), dw::core::DeepIterator::next(), dw::core::DeepIterator::prev(), dw::core::DeepIterator::searchDownward(), and dw::core::DeepIterator::searchSideward().

Content::Type dw::core::Iterator::getMask ( )

inline

References mask.

Referenced by dw::core::DeepIterator::DeepIterator(), and dw::core::DeepIterator::searchSideward().

Widget* dw::core::Iterator::getWidget ( )

inline

References widget.

Referenced by dw::core::SelectionState::buttonPress(), dw::core::SelectionState::buttonRelease(), dw::core::DeepIterator::DeepIterator(), equals(), dw::core::TextIterator::getAllocation(), scrollTo(), and dw::core::DeepIterator::searchSideward().

virtual void dw::core::Iterator::highlight	(	int	start,
		int	end,
		HighlightLayer	layer
	)

pure virtual

Extend highlighted region to contain part of the current content.

For text, start and end define the characters, otherwise, the shape is defined as [0, 1], i.e. for highlighting a whole dw::core::Content, pass 0 and >= 1. To unhighlight see also dw::core::Iterator::unhighlight.

Implemented in dw::core::EmptyIterator, and dw::SimpleContainer::SimpleContainerIterator.

Referenced by dw::core::DeepIterator::highlight().

void dw::core::Iterator::intoStringBuffer ( lout::misc::StringBuffer * sb )

virtual

Store a textual representation of the object in a misc::StringBuffer.

This is used by object::Object::toString.

Reimplemented from lout::object::Object.

Reimplemented in dw::oof::OOFAwareWidget::OOFAwareWidgetIterator.

References lout::misc::StringBuffer::append(), lout::misc::StringBuffer::appendPointer(), content, lout::identity::IdentifiableObject::getClassName(), dw::core::Content::intoStringBuffer(), mask, dw::core::Content::maskIntoStringBuffer(), and widget.

Referenced by dw::core::SelectionState::buttonPress(), dw::core::SelectionState::buttonRelease(), and dw::oof::OOFAwareWidget::OOFAwareWidgetIterator::intoStringBuffer().

virtual bool dw::core::Iterator::next ( )

pure virtual

Move iterator forward and store content it.

Returns true on success.

Implemented in dw::core::TextIterator, dw::oof::OOFAwareWidget::OOFAwareWidgetIterator, dw::core::EmptyIterator, and dw::SimpleContainer::SimpleContainerIterator.

Referenced by dw::core::Widget::containerSizeChangedForChildren(), dw::core::DeepIterator::DeepIterator(), dw::core::Layout::detachWidget(), and dw::core::DeepIterator::next().

virtual bool dw::core::Iterator::prev ( )

pure virtual

Move iterator backward and store content it.

Returns true on success.

Implemented in dw::core::TextIterator, dw::oof::OOFAwareWidget::OOFAwareWidgetIterator, dw::core::EmptyIterator, and dw::SimpleContainer::SimpleContainerIterator.

Referenced by dw::core::DeepIterator::prev().

void dw::core::Iterator::scrollTo	(	Iterator *	it1,
		Iterator *	it2,
		int	start,
		int	end,
		HPosition	hpos,
		VPosition	vpos
	)

static

Scrolls the viewport, so that the region between it1 and it2 is seen, according to hpos and vpos.

The parameters start and end have the same meaning as in dw::core::Iterator::getAllocation, start refers to it1, while end rerers to it2.

If it1 and it2 point to the same location (see code), only it1 is regarded, and both belowstart and belowend refer to it.

Todo:: Changes in the viewport size, until the idle function is called, are not regarded.

References dw::core::Allocation::ascent, dw::core::DeepIterator::clone(), dw::core::DeepIterator::compareTo(), dw::core::Allocation::descent, equals(), getAllocation(), dw::core::DeepIterator::getAllocation(), dw::core::Layout::getHeightViewport(), dw::core::Widget::getLayout(), dw::core::Layout::getUsesViewport(), getWidget(), dw::core::Layout::getWidthViewport(), lout::misc::max(), lout::misc::min(), dw::core::DeepIterator::next(), dw::core::Layout::scrollTo(), dw::core::Allocation::width, dw::core::Allocation::x, and dw::core::Allocation::y.

Referenced by dw::core::DeepIterator::scrollTo().

virtual void dw::core::Iterator::unhighlight	(	int	direction,
		HighlightLayer	layer
	)

pure virtual

Shrink highlighted region to no longer contain the current content.

The direction parameter indicates whether the highlighted region should be reduced from the start (direction > 0) or from the end (direction < 0). If direction is 0 all content is unhighlighted.

Implemented in dw::core::EmptyIterator, and dw::SimpleContainer::SimpleContainerIterator.

Referenced by dw::core::DeepIterator::unhighlight().

void dw::core::Iterator::unref ( )

virtual

Delete the iterator.

The destructor is hidden, implementations may use optimizations for the allocation. (Will soon be the case for dw::core::EmptyIteratorFactory.)

Referenced by dw::core::CharIterator::CharIterator(), dw::core::Widget::containerSizeChangedForChildren(), dw::core::DeepIterator::DeepIterator(), dw::core::Layout::detachWidget(), dw::core::DeepIterator::Stack::pop(), dw::core::DeepIterator::searchDownward(), dw::core::DeepIterator::searchSideward(), and dw::Textblock::sendSelectionEvent().