A widget that represents a navigatable tree. More...

#include <Wt/WTree>

Inheritance diagram for Wt::WTree:

Public Types
typedef std::set< WTreeNode * >	WTreeNodeSet
	Typedef for a set of WTreeNode's.

Public Types inherited from Wt::WObject
typedef void(WObject::*	Method) ()
	Typedef for a WObject method without arguments.

Public Member Functions
	WTree (WContainerWidget *parent=0)
	Creates a new tree.

void	setTreeRoot (WTreeNode *root)
	Sets the tree root node. More...

WTreeNode *	treeRoot () const
	Returns the root node. More...

void	setSelectionMode (SelectionMode mode)
	Sets the selection mode. More...

SelectionMode	selectionMode () const
	Returns the selection mode.

const WTreeNodeSet &	selectedNodes () const
	Returns the set of selected tree nodes.

void	select (const WTreeNodeSet &nodes)
	Sets a selection of tree nodes.

void	select (WTreeNode *node, bool selected=true)
	Selects or unselect the given node.

bool	isSelected (WTreeNode *node) const
	Returns if the given node is currently selected.

void	clearSelection ()
	Clears the current selection.

Signal &	itemSelectionChanged ()
	Signal that is emitted when the selection changes.

Public Member Functions inherited from Wt::WCompositeWidget
	WCompositeWidget (WContainerWidget *parent=0)
	Creates a WCompositeWidget. More...

	WCompositeWidget (WWidget implementation, WContainerWidget parent)
	Creates a WCompositeWidget with given implementation. More...

virtual void	setObjectName (const std::string &name)
	Sets an object name. More...

virtual std::string	objectName () const
	Returns the object name. More...

virtual const std::string	id () const
	Returns the (unique) identifier for this object. More...

virtual void	setPositionScheme (PositionScheme scheme)
	Sets the CSS position scheme. More...

virtual PositionScheme	positionScheme () const
	Returns the CSS position scheme. More...

virtual void	setOffsets (const WLength &offset, WFlags< Side > sides=All)
	Sets CSS offsets for a non-statically positioned widget. More...

virtual WLength	offset (Side s) const
	Returns a CSS offset. More...

virtual void	resize (const WLength &width, const WLength &height)
	Resizes the widget. More...

virtual WLength	width () const
	Returns the width. More...

virtual WLength	height () const
	Returns the height. More...

virtual void	setMinimumSize (const WLength &width, const WLength &height)
	Sets a minimum size. More...

virtual WLength	minimumWidth () const
	Returns the minimum width. More...

virtual WLength	minimumHeight () const
	Returns the minimum height. More...

virtual void	setMaximumSize (const WLength &width, const WLength &height)
	Sets a maximum size. More...

virtual WLength	maximumWidth () const
	Returns the maximum width. More...

virtual WLength	maximumHeight () const
	Returns the maximum height. More...

virtual void	setLineHeight (const WLength &height)
	Sets the CSS line height for contained text.

virtual WLength	lineHeight () const
	Returns the CSS line height for contained text. More...

virtual void	setFloatSide (Side s)
	Specifies a CSS float side. More...

virtual Side	floatSide () const
	Returns the CSS float side. More...

virtual void	setClearSides (WFlags< Side > sides)
	Sets the sides that should be cleared of floats. More...

virtual WFlags< Side >	clearSides () const
	Returns the sides that should remain empty. More...

virtual void	setMargin (const WLength &margin, WFlags< Side > sides=All)
	Sets CSS margins around the widget. More...

virtual WLength	margin (Side side) const
	Returns a CSS margin set. More...

virtual void	setHiddenKeepsGeometry (bool enabled)
	Sets whether the widget keeps its geometry when hidden. More...

virtual bool	hiddenKeepsGeometry () const
	Returns whether the widget keeps its geometry when hidden. More...

virtual void	setHidden (bool hidden, const WAnimation &animation=WAnimation())
	Hides or shows the widget. More...

virtual bool	isHidden () const
	Returns whether the widget is set hidden. More...

virtual bool	isVisible () const
	Returns whether the widget is visible. More...

virtual void	setDisabled (bool disabled)
	Sets whether the widget is disabled. More...

virtual bool	isDisabled () const
	Returns whether the widget is set disabled. More...

virtual bool	isEnabled () const
	Returns whether the widget is enabled. More...

virtual void	setPopup (bool popup)
	Lets the widget overlay over other sibling widgets. More...

virtual bool	isPopup () const
	Returns whether the widget is overlayed. More...

virtual void	setInline (bool isInline)
	Sets whether the widget is displayed inline or as a block. More...

virtual bool	isInline () const
	Returns whether the widget is displayed inline or as block. More...

virtual void	setDecorationStyle (const WCssDecorationStyle &style)
	Sets a CSS decoration style. More...

virtual WCssDecorationStyle &	decorationStyle ()
	Returns the decoration style of this widget. More...

virtual void	setStyleClass (const WString &styleClass)
	Sets (one or more) CSS style classes. More...

virtual WString	styleClass () const
	Returns the CSS style class. More...

virtual void	addStyleClass (const WString &styleClass, bool force=false)
	Adds a CSS style class. More...

virtual void	removeStyleClass (const WString &styleClass, bool force=false)
	Removes a CSS style class. More...

virtual bool	hasStyleClass (const WString &styleClass) const
	Returns whether the widget has a style class.

virtual void	setVerticalAlignment (AlignmentFlag alignment, const WLength &length=WLength::Auto)
	Sets the vertical alignment. More...

virtual AlignmentFlag	verticalAlignment () const
	Returns the vertical alignment. More...

virtual WLength	verticalAlignmentLength () const
	Returns the fixed vertical alignment that was set. More...

virtual void	setToolTip (const WString &text, TextFormat textFormat=PlainText)
	Sets a tooltip. More...

virtual WString	toolTip () const
	Returns the tooltip.

virtual void	setDeferredToolTip (bool enable, TextFormat textFormat=PlainText)
	Enable deferred tooltip. More...

virtual void	refresh ()
	Refresh the widget. More...

virtual void	setAttributeValue (const std::string &name, const WString &value)
	Sets an attribute value. More...

virtual WString	attributeValue (const std::string &name) const
	Returns an attribute value. More...

virtual void	setJavaScriptMember (const std::string &name, const std::string &value)
	Sets a JavaScript member. More...

virtual std::string	javaScriptMember (const std::string &name) const
	Returns the value of a JavaScript member. More...

virtual void	callJavaScriptMember (const std::string &name, const std::string &args)
	Calls a JavaScript member. More...

virtual void	load ()
	Loads content just before the widget is used. More...

virtual bool	loaded () const
	Returns whether this widget has been loaded. More...

virtual void	setCanReceiveFocus (bool enabled)
	Sets whether the widget can receive focus. More...

virtual bool	canReceiveFocus () const
	Returns whether the widget can receive focus. More...

virtual void	setFocus (bool focus)
	Sets focus. More...

virtual bool	setFirstFocus ()
	Set focus on the widget's first descendant. More...

virtual bool	hasFocus () const
	Returns whether the widget currently has the focus.

virtual void	setTabIndex (int index)
	Sets the tab index. More...

virtual int	tabIndex () const
	Returns the tab index. More...

virtual void	setId (const std::string &id)
	Sets the CSS Id. More...

virtual WWidget *	find (const std::string &name)
	Finds a descendent widget by name. More...

virtual WWidget *	findById (const std::string &name)
	Finds a descendent widget by id.

virtual void	setSelectable (bool selectable)
	Sets as selectable. More...

virtual void	doJavaScript (const std::string &js)
	Executes the given JavaScript statements when the widget is rendered or updated. More...

virtual void	propagateSetEnabled (bool enabled)
	Propagates that a widget was enabled or disabled through children. More...

virtual bool	scrollVisibilityEnabled () const WT_CXX11ONLY(finaloverride)
	Returns whether scroll visibility detection is enabled for this widget. More...

virtual void	setScrollVisibilityEnabled (bool enabled) WT_CXX11ONLY(finaloverride)
	Sets whether scroll visibility detection is enabled for this widget. More...

virtual int	scrollVisibilityMargin () const WT_CXX11ONLY(finaloverride)
	Returns the margin around the viewport within which the widget is considered visible. More...

virtual void	setScrollVisibilityMargin (int margin) WT_CXX11ONLY(finaloverride)
	Sets the margin around the viewport within which the widget is considered visible. More...

virtual Signal< bool > &	scrollVisibilityChanged () WT_CXX11ONLY(finaloverride)
	Signal triggered when the scroll visibility of this widget changes. More...

virtual bool	isScrollVisible () const WT_CXX11ONLY(finaloverride)
	Returns whether this widget is currently considered scroll visible. More...

virtual void	setThemeStyleEnabled (bool enabled)
	Sets whether theme styling for a widget is enabled or disabled. More...

virtual bool	isThemeStyleEnabled () const
	Returns whether this widget is currently styled by the chosen theme. More...

Public Member Functions inherited from Wt::WWidget
virtual	~WWidget ()
	Destructor. More...

WWidget *	parent () const
	Returns the parent widget. More...

virtual void	removeChild (WObject *child)
	Removes a child object. More...

void	setWidth (const WLength &width)
	Sets the width. More...

void	setHeight (const WLength &height)
	Sets the height. More...

virtual void	positionAt (const WWidget *widget, Orientation orientation=Vertical)
	Positions a widget next to another widget. More...

virtual void	toggleStyleClass (const WString &styleClass, bool add, bool force=false)
	Toggles a CSS style class.

std::string	jsRef () const
	Returns a JavaScript expression to the corresponding DOM node. More...

void	setFocus ()
	Sets focus. More...

virtual void	acceptDrops (const std::string &mimeType, const WString &hoverStyleClass=WString())
	Sets a mime type to be accepted for dropping. More...

virtual void	stopAcceptDrops (const std::string &mimeType)
	Indicates that a mime type is no longer accepted for dropping. More...

virtual void	htmlText (std::ostream &out)
	Streams the (X)HTML representation. More...

bool	isRendered () const
	Returns whether the widget is rendered. More...

void	hide ()
	Hides the widget. More...

void	animateHide (const WAnimation &animation)
	Hides the widget using an animation. More...

void	show ()
	Shows the widget. More...

void	animateShow (const WAnimation &animation)
	Shows the widget using an animation. More...

void	enable ()
	Enables the widget. More...

void	disable ()
	Disable thes widget. More...

bool	layoutSizeAware () const
	Returns whether the widget is layout size aware. More...

Public Member Functions inherited from Wt::WObject
	WObject (WObject *parent=0)
	Create a WObject with a given parent object. More...

virtual	~WObject ()
	Destructor. More...

void	resetLearnedSlots ()
	Resets learned stateless slot implementations. More...

template<class T >
void	resetLearnedSlot (void(T::*method)())
	Resets a learned stateless slot implementation. More...

template<class T >
WStatelessSlot *	implementStateless (void(T::*method)())
	Declares a slot to be stateless and learn client-side behaviour on first invocation. More...

template<class T >
WStatelessSlot *	implementStateless (void(T::method)(), void(T::undoMethod)())
	Declares a slot to be stateless and learn client-side behaviour in advance. More...

void	isNotStateless ()
	Marks the current function as not stateless. More...

template<class T >
WStatelessSlot *	implementJavaScript (void(T::*method)(), const std::string &jsCode)
	Provides a JavaScript implementation for a method. More...

void	addChild (WObject *child)
	Adds a child object. More...

const std::vector< WObject * > &	children () const
	Returns the children.

WObject *	parent () const
	Returns the parent object.

Additional Inherited Members
Static Public Member Functions inherited from Wt::WWidget
static WString	tr (const char *key)
	Short hand for WString::tr() More...

Protected Member Functions inherited from Wt::WCompositeWidget
virtual void	enableAjax ()
	Progresses to an Ajax-enabled widget. More...

void	setImplementation (WWidget *widget)
	Set the implementation widget. More...

WWidget *	implementation ()
	Get the implementation widget. More...

virtual int	boxPadding (Orientation orientation) const
	Returns the widget's built-in padding. More...

virtual int	boxBorder (Orientation orientation) const
	Returns the widget's built-in border width. More...

virtual void	render (WFlags< RenderFlag > flags)
	Renders the widget. More...

Protected Member Functions inherited from Wt::WWidget
void	setLayoutSizeAware (bool sizeAware)
	Sets the widget to be aware of its size set by a layout manager. More...

virtual void	layoutSizeChanged (int width, int height)
	Virtual method that indicates a size change. More...

	WWidget (WContainerWidget *parent=0)
	Creates a widget. More...

virtual void	dropEvent (WDropEvent dropEvent)
	Handles a drop event. More...

void	scheduleRender (WFlags< RepaintFlag > flags=0)
	Schedules rerendering of the widget. More...

virtual WStatelessSlot *	getStateless (Method method)
	On-demand stateless slot implementation. More...

Static Protected Member Functions inherited from Wt::WObject
static WObject *	sender ()
	Returns the sender of the current slot call. More...

Detailed Description

A widget that represents a navigatable tree.

WTree provides a tree widget, and coordinates selection functionality.

Unlike the MVC-based WTreeView, the tree renders a widget hierarchy, rather than a hierarhical standard model. This provides extra flexibility (as any widget can be used as contents), at the cost of server-side, client-side and bandwidth resources (especially for large tree tables).

The tree is implemented as a hierarchy of WTreeNode widgets.

Selection is rendered by calling WTreeNode::renderSelected(bool). Only tree nodes that are selectable may participate in the selection.

Usage example:

Wt::WIconPair *folderIcon = new Wt::WIconPair("icons/yellow-folder-closed.png",
                                       "icons/yellow-folder-open.png", false);
Wt::WTree *tree = new Wt::WTree();
tree->setSelectionMode(Wt::SingleSelection);
Wt::WTreeNode *root = new Wt::WTreeNode("Tree root", folderIcon);
root->setStyleClass("example-tree");
tree->setTreeRoot(root);
root->label()->setTextFormat(Wt::PlainText);
root->setImagePack("resources/");
root->setLoadPolicy(Wt::WTreeNode::NextLevelLoading);
root->addChildNode(new Wt::WTreeNode("one"));
root->addChildNode(new Wt::WTreeNode("two"));
Wt::WTreeNode *three = new Wt::WTreeNode("three");
three->addChildNode(new WTreeNode("three: one"));
three->addChildNode(new WTreeNode("three: two"));
root->addChildNode(three);
root->expand();