Manages a list of selectable items. More...

#include <juce_SelectedItemSet.h>

Inheritance diagram for juce::SelectedItemSet< SelectableItemType >:

Collaboration diagram for juce::SelectedItemSet< SelectableItemType >:

[legend]

Public Types
using	ItemArray = Array< SelectableItemType >

using	ItemType = SelectableItemType

using	ParameterType = typename TypeHelpers::ParameterType< SelectableItemType >::type

Public Member Functions
	SelectedItemSet ()=default
	Creates an empty set. More...

	SelectedItemSet (const ItemArray &items)
	Creates a set based on an array of items. More...

	SelectedItemSet (const SelectedItemSet &other)
	Creates a copy of another set. More...

void	addChangeListener (ChangeListener *listener)
	Registers a listener to receive change callbacks from this broadcaster. More...

void	addToSelection (ParameterType item)
	Selects an item. More...

void	addToSelectionBasedOnModifiers (ParameterType item, ModifierKeys modifiers)
	Selects or deselects an item. More...

bool	addToSelectionOnMouseDown (ParameterType item, ModifierKeys modifiers)
	Selects or deselects items that can also be dragged, based on a mouse-down event. More...

void	addToSelectionOnMouseUp (ParameterType item, ModifierKeys modifiers, const bool wasItemDragged, const bool resultOfMouseDownSelectMethod)
	Selects or deselects items that can also be dragged, based on a mouse-up event. More...

const SelectableItemType *	begin () const noexcept

SelectableItemType *	begin () noexcept
	Provides iterator access to the array of items. More...

void	changed ()
	Used internally, but can be called to force a change message to be sent to the ChangeListeners. More...

void	changed (const bool synchronous)
	Used internally, but can be called to force a change message to be sent to the ChangeListeners. More...

void	deselect (ParameterType item)
	Deselects an item. More...

void	deselectAll ()
	Deselects all items. More...

void	dispatchPendingMessages ()
	If a change message has been sent but not yet dispatched, this will call sendSynchronousChangeMessage() to make the callback immediately. More...

const SelectableItemType *	end () const noexcept
	Provides iterator access to the array of items. More...

SelectableItemType *	end () noexcept
	Provides iterator access to the array of items. More...

const ItemArray &	getItemArray () const noexcept
	Provides access to the array of items. More...

int	getNumSelected () const noexcept
	Returns the number of currently selected items. More...

SelectableItemType	getSelectedItem (const int index) const
	Returns one of the currently selected items. More...

bool	isSelected (ParameterType item) const noexcept
	True if this item is currently selected. More...

virtual void	itemDeselected (SelectableItemType)
	Can be overridden to do special handling when an item is deselected. More...

virtual void	itemSelected (SelectableItemType)
	Can be overridden to do special handling when an item is selected. More...

SelectedItemSet &	operator= (const SelectedItemSet &other)
	Creates a copy of another set. More...

void	removeAllChangeListeners ()
	Removes all listeners from the list. More...

void	removeChangeListener (ChangeListener *listener)
	Unregisters a listener from the list. More...

void	selectOnly (ParameterType item)
	Clears any other currently selected items, and selects this item. More...

void	sendChangeMessage ()
	Causes an asynchronous change message to be sent to all the registered listeners. More...

void	sendSynchronousChangeMessage ()
	Sends a synchronous change message to all the registered listeners. More...

Private Member Functions
void	callListeners ()

Private Attributes
std::atomic< bool >	anyListeners { false }

ChangeBroadcasterCallback	broadcastCallback

ListenerList< ChangeListener >	changeListeners

ItemArray	selectedItems

Detailed Description

template<class SelectableItemType>
class juce::SelectedItemSet< SelectableItemType >

Manages a list of selectable items.

Use one of these to keep a track of things that the user has highlighted, like icons or things in a list.

The class is templated so that you can use it to hold either a set of pointers to objects, or a set of ID numbers or handles, for cases where each item may not always have a corresponding object.

To be informed when items are selected/deselected, register a ChangeListener with this object.

@tags{GUI}

Member Typedef Documentation

◆ ItemArray

template<class SelectableItemType >

using juce::SelectedItemSet< SelectableItemType >::ItemArray = Array<SelectableItemType>

◆ ItemType

template<class SelectableItemType >

using juce::SelectedItemSet< SelectableItemType >::ItemType = SelectableItemType

◆ ParameterType

template<class SelectableItemType >

using juce::SelectedItemSet< SelectableItemType >::ParameterType = typename TypeHelpers::ParameterType<SelectableItemType>::type

Constructor & Destructor Documentation

◆ SelectedItemSet() [1/3]

template<class SelectableItemType >

juce::SelectedItemSet< SelectableItemType >::SelectedItemSet ( )

default

Creates an empty set.

◆ SelectedItemSet() [2/3]

template<class SelectableItemType >

juce::SelectedItemSet< SelectableItemType >::SelectedItemSet ( const ItemArray & items )

inlineexplicit

Creates a set based on an array of items.

◆ SelectedItemSet() [3/3]

template<class SelectableItemType >

juce::SelectedItemSet< SelectableItemType >::SelectedItemSet ( const SelectedItemSet< SelectableItemType > & other )

inline

Creates a copy of another set.

Member Function Documentation

◆ addChangeListener()

void juce::ChangeBroadcaster::addChangeListener ( ChangeListener * listener )

inherited

Registers a listener to receive change callbacks from this broadcaster.

Trying to add a listener that's already on the list will have no effect.

◆ addToSelection()

template<class SelectableItemType >

void juce::SelectedItemSet< SelectableItemType >::addToSelection ( ParameterType item )

inline

Selects an item.

If the item is already selected, no change notification will be sent out.

See also: selectOnly, addToSelectionBasedOnModifiers

References juce::Array< ElementType, TypeOfCriticalSectionToUse, minimumAllocatedSize >::add(), juce::SelectedItemSet< SelectableItemType >::changed(), juce::SelectedItemSet< SelectableItemType >::isSelected(), juce::SelectedItemSet< SelectableItemType >::itemSelected(), and juce::SelectedItemSet< SelectableItemType >::selectedItems.

Referenced by juce::SelectedItemSet< SelectableItemType >::addToSelectionBasedOnModifiers().

◆ addToSelectionBasedOnModifiers()

template<class SelectableItemType >

void juce::SelectedItemSet< SelectableItemType >::addToSelectionBasedOnModifiers	(	ParameterType	item,
		ModifierKeys	modifiers
	)

inline

Selects or deselects an item.

This will use the modifier keys to decide whether to deselect other items first.

So if the shift key is held down, the item will be added without deselecting anything (same as calling addToSelection() )

If no modifiers are down, the current selection will be cleared first (same as calling selectOnly() )

If the ctrl (or command on the Mac) key is held down, the item will be toggled - so it'll be added to the set unless it's already there, in which case it'll be deselected.

If the items that you're selecting can also be dragged, you may need to use the addToSelectionOnMouseDown() and addToSelectionOnMouseUp() calls to handle the subtleties of this kind of usage.

See also: selectOnly, addToSelection, addToSelectionOnMouseDown, addToSelectionOnMouseUp

References juce::SelectedItemSet< SelectableItemType >::addToSelection(), juce::SelectedItemSet< SelectableItemType >::deselect(), juce::ModifierKeys::isCommandDown(), juce::SelectedItemSet< SelectableItemType >::isSelected(), juce::ModifierKeys::isShiftDown(), and juce::SelectedItemSet< SelectableItemType >::selectOnly().

Referenced by juce::SelectedItemSet< SelectableItemType >::addToSelectionOnMouseDown(), and juce::SelectedItemSet< SelectableItemType >::addToSelectionOnMouseUp().

◆ addToSelectionOnMouseDown()

template<class SelectableItemType >

bool juce::SelectedItemSet< SelectableItemType >::addToSelectionOnMouseDown	(	ParameterType	item,
		ModifierKeys	modifiers
	)

inline

Selects or deselects items that can also be dragged, based on a mouse-down event.

If you call addToSelectionOnMouseDown() at the start of your mouseDown event, and then call addToSelectionOnMouseUp() at the end of your mouseUp event, this makes it easy to handle multiple-selection of sets of objects that can also be dragged.

For example, if you have several items already selected, and you click on one of them (without dragging), then you'd expect this to deselect the other, and just select the item you clicked on. But if you had clicked on this item and dragged it, you'd have expected them all to stay selected.

When you call this method, you'll need to store the boolean result, because the addToSelectionOnMouseUp() method will need to be know this value.

See also: addToSelectionOnMouseUp, addToSelectionBasedOnModifiers

References juce::SelectedItemSet< SelectableItemType >::addToSelectionBasedOnModifiers(), juce::ModifierKeys::isPopupMenu(), and juce::SelectedItemSet< SelectableItemType >::isSelected().

◆ addToSelectionOnMouseUp()

template<class SelectableItemType >

void juce::SelectedItemSet< SelectableItemType >::addToSelectionOnMouseUp	(	ParameterType	item,
		ModifierKeys	modifiers,
		const bool	wasItemDragged,
		const bool	resultOfMouseDownSelectMethod
	)

inline

Selects or deselects items that can also be dragged, based on a mouse-up event.

Call this during a mouseUp callback, when you have previously called the addToSelectionOnMouseDown() method during your mouseDown event.

See addToSelectionOnMouseDown() for more info

Parameters

item	the item to select (or deselect)
modifiers	the modifiers from the mouse-up event
wasItemDragged	true if your item was dragged during the mouse click
resultOfMouseDownSelectMethod	this is the boolean return value that came back from the addToSelectionOnMouseDown() call that you should have made during the matching mouseDown event

References juce::SelectedItemSet< SelectableItemType >::addToSelectionBasedOnModifiers().

◆ begin() [1/2]

template<class SelectableItemType >

const SelectableItemType* juce::SelectedItemSet< SelectableItemType >::begin ( ) const

inlinenoexcept

References juce::Array< ElementType, TypeOfCriticalSectionToUse, minimumAllocatedSize >::begin(), and juce::SelectedItemSet< SelectableItemType >::selectedItems.

◆ begin() [2/2]

template<class SelectableItemType >

SelectableItemType* juce::SelectedItemSet< SelectableItemType >::begin ( )

inlinenoexcept

Provides iterator access to the array of items.

References juce::Array< ElementType, TypeOfCriticalSectionToUse, minimumAllocatedSize >::begin(), and juce::SelectedItemSet< SelectableItemType >::selectedItems.

◆ callListeners()

void juce::ChangeBroadcaster::callListeners ( )

privateinherited

◆ changed() [1/2]

template<class SelectableItemType >

void juce::SelectedItemSet< SelectableItemType >::changed ( )

inline

Used internally, but can be called to force a change message to be sent to the ChangeListeners.

References juce::ChangeBroadcaster::sendChangeMessage().

Referenced by juce::SelectedItemSet< SelectableItemType >::addToSelection(), juce::SelectedItemSet< SelectableItemType >::deselect(), juce::SelectedItemSet< SelectableItemType >::deselectAll(), juce::SelectedItemSet< SelectableItemType >::operator=(), and juce::SelectedItemSet< SelectableItemType >::selectOnly().

◆ changed() [2/2]

template<class SelectableItemType >

void juce::SelectedItemSet< SelectableItemType >::changed ( const bool synchronous )

inline

Used internally, but can be called to force a change message to be sent to the ChangeListeners.

References juce::ChangeBroadcaster::sendChangeMessage(), and juce::ChangeBroadcaster::sendSynchronousChangeMessage().

◆ deselect()

template<class SelectableItemType >

void juce::SelectedItemSet< SelectableItemType >::deselect ( ParameterType item )

inline

Deselects an item.

References juce::SelectedItemSet< SelectableItemType >::changed(), juce::Array< ElementType, TypeOfCriticalSectionToUse, minimumAllocatedSize >::indexOf(), juce::SelectedItemSet< SelectableItemType >::itemDeselected(), juce::Array< ElementType, TypeOfCriticalSectionToUse, minimumAllocatedSize >::removeAndReturn(), and juce::SelectedItemSet< SelectableItemType >::selectedItems.

Referenced by juce::SelectedItemSet< SelectableItemType >::addToSelectionBasedOnModifiers(), and juce::SelectedItemSet< SelectableItemType >::selectOnly().

◆ deselectAll()

template<class SelectableItemType >

void juce::SelectedItemSet< SelectableItemType >::deselectAll ( )

inline

Deselects all items.

References juce::SelectedItemSet< SelectableItemType >::changed(), juce::SelectedItemSet< SelectableItemType >::itemDeselected(), juce::jmin(), juce::Array< ElementType, TypeOfCriticalSectionToUse, minimumAllocatedSize >::removeAndReturn(), juce::SelectedItemSet< SelectableItemType >::selectedItems, and juce::Array< ElementType, TypeOfCriticalSectionToUse, minimumAllocatedSize >::size().

Referenced by juce::SelectedItemSet< SelectableItemType >::selectOnly().

◆ dispatchPendingMessages()

void juce::ChangeBroadcaster::dispatchPendingMessages ( )

inherited

If a change message has been sent but not yet dispatched, this will call sendSynchronousChangeMessage() to make the callback immediately.

For thread-safety reasons, you must only call this method on the main message thread.

◆ end() [1/2]

template<class SelectableItemType >

const SelectableItemType* juce::SelectedItemSet< SelectableItemType >::end ( ) const

inlinenoexcept

Provides iterator access to the array of items.

References juce::Array< ElementType, TypeOfCriticalSectionToUse, minimumAllocatedSize >::end(), and juce::SelectedItemSet< SelectableItemType >::selectedItems.

◆ end() [2/2]

template<class SelectableItemType >

SelectableItemType* juce::SelectedItemSet< SelectableItemType >::end ( )

inlinenoexcept

Provides iterator access to the array of items.

References juce::Array< ElementType, TypeOfCriticalSectionToUse, minimumAllocatedSize >::end(), and juce::SelectedItemSet< SelectableItemType >::selectedItems.

◆ getItemArray()

template<class SelectableItemType >

const ItemArray& juce::SelectedItemSet< SelectableItemType >::getItemArray ( ) const

inlinenoexcept

Provides access to the array of items.

References juce::SelectedItemSet< SelectableItemType >::selectedItems.

◆ getNumSelected()

template<class SelectableItemType >

int juce::SelectedItemSet< SelectableItemType >::getNumSelected ( ) const

inlinenoexcept

Returns the number of currently selected items.

See also: getSelectedItem

References juce::SelectedItemSet< SelectableItemType >::selectedItems, and juce::Array< ElementType, TypeOfCriticalSectionToUse, minimumAllocatedSize >::size().

◆ getSelectedItem()

template<class SelectableItemType >

SelectableItemType juce::SelectedItemSet< SelectableItemType >::getSelectedItem ( const int index ) const

inline

Returns one of the currently selected items.

If the index is out-of-range, this returns a default-constructed SelectableItemType.

See also: getNumSelected

References juce::gl::index, and juce::SelectedItemSet< SelectableItemType >::selectedItems.

◆ isSelected()

template<class SelectableItemType >

bool juce::SelectedItemSet< SelectableItemType >::isSelected ( ParameterType item ) const

inlinenoexcept

True if this item is currently selected.

References juce::Array< ElementType, TypeOfCriticalSectionToUse, minimumAllocatedSize >::contains(), and juce::SelectedItemSet< SelectableItemType >::selectedItems.

Referenced by juce::SelectedItemSet< SelectableItemType >::addToSelection(), juce::SelectedItemSet< SelectableItemType >::addToSelectionBasedOnModifiers(), juce::SelectedItemSet< SelectableItemType >::addToSelectionOnMouseDown(), juce::SelectedItemSet< SelectableItemType >::operator=(), and juce::SelectedItemSet< SelectableItemType >::selectOnly().

◆ itemDeselected()

template<class SelectableItemType >

virtual void juce::SelectedItemSet< SelectableItemType >::itemDeselected ( SelectableItemType )

inlinevirtual

Can be overridden to do special handling when an item is deselected.

For example, if the item is an object, you might want to call it and tell it that it's being deselected.

Referenced by juce::SelectedItemSet< SelectableItemType >::deselect(), juce::SelectedItemSet< SelectableItemType >::deselectAll(), and juce::SelectedItemSet< SelectableItemType >::operator=().

◆ itemSelected()

template<class SelectableItemType >

virtual void juce::SelectedItemSet< SelectableItemType >::itemSelected ( SelectableItemType )

inlinevirtual

Can be overridden to do special handling when an item is selected.

For example, if the item is an object, you might want to call it and tell it that it's being selected.

Referenced by juce::SelectedItemSet< SelectableItemType >::addToSelection(), juce::SelectedItemSet< SelectableItemType >::operator=(), and juce::SelectedItemSet< SelectableItemType >::selectOnly().

◆ operator=()

template<class SelectableItemType >

SelectedItemSet& juce::SelectedItemSet< SelectableItemType >::operator= ( const SelectedItemSet< SelectableItemType > & other )

inline

Creates a copy of another set.

References juce::Array< ElementType, TypeOfCriticalSectionToUse, minimumAllocatedSize >::add(), juce::SelectedItemSet< SelectableItemType >::changed(), juce::Array< ElementType, TypeOfCriticalSectionToUse, minimumAllocatedSize >::getReference(), juce::SelectedItemSet< SelectableItemType >::isSelected(), juce::SelectedItemSet< SelectableItemType >::itemDeselected(), juce::SelectedItemSet< SelectableItemType >::itemSelected(), juce::Array< ElementType, TypeOfCriticalSectionToUse, minimumAllocatedSize >::removeAndReturn(), juce::SelectedItemSet< SelectableItemType >::selectedItems, and juce::Array< ElementType, TypeOfCriticalSectionToUse, minimumAllocatedSize >::size().

◆ removeAllChangeListeners()

void juce::ChangeBroadcaster::removeAllChangeListeners ( )

inherited

Removes all listeners from the list.

◆ removeChangeListener()

void juce::ChangeBroadcaster::removeChangeListener ( ChangeListener * listener )

inherited

Unregisters a listener from the list.

If the listener isn't on the list, this won't have any effect.

◆ selectOnly()

template<class SelectableItemType >

void juce::SelectedItemSet< SelectableItemType >::selectOnly ( ParameterType item )

inline

Clears any other currently selected items, and selects this item.

If this item is already the only thing selected, no change notification will be sent out.

See also: addToSelection, addToSelectionBasedOnModifiers

References juce::Array< ElementType, TypeOfCriticalSectionToUse, minimumAllocatedSize >::add(), juce::SelectedItemSet< SelectableItemType >::changed(), juce::SelectedItemSet< SelectableItemType >::deselect(), juce::SelectedItemSet< SelectableItemType >::deselectAll(), juce::Array< ElementType, TypeOfCriticalSectionToUse, minimumAllocatedSize >::getUnchecked(), juce::SelectedItemSet< SelectableItemType >::isSelected(), juce::SelectedItemSet< SelectableItemType >::itemSelected(), juce::jmin(), juce::SelectedItemSet< SelectableItemType >::selectedItems, and juce::Array< ElementType, TypeOfCriticalSectionToUse, minimumAllocatedSize >::size().

Referenced by juce::SelectedItemSet< SelectableItemType >::addToSelectionBasedOnModifiers().

◆ sendChangeMessage()

void juce::ChangeBroadcaster::sendChangeMessage ( )

inherited

Causes an asynchronous change message to be sent to all the registered listeners.

The message will be delivered asynchronously by the main message thread, so this method will return immediately. To call the listeners synchronously use sendSynchronousChangeMessage().

Referenced by juce::SelectedItemSet< SelectableItemType >::changed().

◆ sendSynchronousChangeMessage()

void juce::ChangeBroadcaster::sendSynchronousChangeMessage ( )

inherited

Sends a synchronous change message to all the registered listeners.

This will immediately call all the listeners that are registered. For thread-safety reasons, you must only call this method on the main message thread.

See also: dispatchPendingMessages

Referenced by juce::SelectedItemSet< SelectableItemType >::changed().

Member Data Documentation

◆ anyListeners

std::atomic<bool> juce::ChangeBroadcaster::anyListeners { false }

privateinherited

◆ broadcastCallback

ChangeBroadcasterCallback juce::ChangeBroadcaster::broadcastCallback

privateinherited

◆ changeListeners

ListenerList<ChangeListener> juce::ChangeBroadcaster::changeListeners

privateinherited

◆ selectedItems

template<class SelectableItemType >

ItemArray juce::SelectedItemSet< SelectableItemType >::selectedItems

private

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

juce_SelectedItemSet.h

Public Types

Public Member Functions

Private Member Functions

Private Attributes

Detailed Description

template<class SelectableItemType> class juce::SelectedItemSet< SelectableItemType >

Member Typedef Documentation

◆ ItemArray

◆ ItemType

◆ ParameterType

Constructor & Destructor Documentation

◆ SelectedItemSet() [1/3]

◆ SelectedItemSet() [2/3]

◆ SelectedItemSet() [3/3]

Member Function Documentation

◆ addChangeListener()

◆ addToSelection()

◆ addToSelectionBasedOnModifiers()

◆ addToSelectionOnMouseDown()

◆ addToSelectionOnMouseUp()

◆ begin() [1/2]

◆ begin() [2/2]

◆ callListeners()

◆ changed() [1/2]

◆ changed() [2/2]

◆ deselect()

◆ deselectAll()

◆ dispatchPendingMessages()

◆ end() [1/2]

◆ end() [2/2]

◆ getItemArray()

◆ getNumSelected()

◆ getSelectedItem()

◆ isSelected()

◆ itemDeselected()

◆ itemSelected()

◆ operator=()

◆ removeAllChangeListeners()

◆ removeChangeListener()

◆ selectOnly()

◆ sendChangeMessage()

◆ sendSynchronousChangeMessage()

Member Data Documentation

◆ anyListeners

◆ broadcastCallback

◆ changeListeners

◆ selectedItems

template<class SelectableItemType>
class juce::SelectedItemSet< SelectableItemType >