Package org.eclipse.jface.widgets

Class TreeFactory

java.lang.Object

org.eclipse.jface.widgets.AbstractWidgetFactory<F,C,Composite>

org.eclipse.jface.widgets.AbstractControlFactory<TreeFactory,Tree>

org.eclipse.jface.widgets.TreeFactory

public final class TreeFactory
extends AbstractControlFactory<TreeFactory,Tree>

This class provides a convenient shorthand for creating and initializing Tree. This offers several benefits over creating Tree normal way:

• The same factory can be used many times to create several Tree instances
• The setters on TreeFactory all return "this", allowing them to be chained
• TreeFactory accepts a Lambda for SelectionEvent (see onSelect(java.util.function.Consumer<org.eclipse.swt.events.SelectionEvent>))
• TreeFactory accepts a Lambda for TreeEvent (see onExpand(java.util.function.Consumer<org.eclipse.swt.events.TreeEvent>))
• TreeFactory accepts a Lambda for TreeEvent (see onCollapse(java.util.function.Consumer<org.eclipse.swt.events.TreeEvent>))

Example usage:

 Tree tree = TreeFactory.newTree(SWT.CHECK) //
                .headerVisible(true) //
                .linesVisible(true) //
                .onSelect(e -> treeClicked(e)) //
                .onExpand(e -> treeExpanded(e)) //
                .create(parent);
 

The above example creates a tree, sets some properties, registers a SelectionListener and a TreeListener for expansion and finally creates the tree in "parent".

Note that this class does not extend AbstractCompositeFactory even though Tree extends Composite. This is because Tree is not supposed to be used like a Composite.

Since:

3.18

Method Summary

Modifier and Type	Method	Description
TreeFactory	headerVisible(boolean visible)	Marks the receiver's header as visible if the argument is true, and marks it invisible otherwise.
TreeFactory	itemCount(int count)	Sets the number of root-level items contained in the receiver.
TreeFactory	linesVisible(boolean visible)	Marks the receiver's lines as visible if the argument is true, and marks it invisible otherwise.
static TreeFactory	newTree(int style)	Creates a new TreeFactory with the given style.
TreeFactory	onCollapse(Consumer<TreeEvent> consumer)	Creates a TreeListener and registers it for the collapsed event.
TreeFactory	onExpand(Consumer<TreeEvent> consumer)	Creates a TreeListener and registers it for the expanded event.
TreeFactory	onSelect(Consumer<SelectionEvent> consumer)	Creates a SelectionListener and registers it for the widgetSelected event.

Methods inherited from class org.eclipse.jface.widgets.AbstractControlFactory

background, enabled, font, foreground, layoutData, orientation, supplyLayoutData, tooltip

Methods inherited from class org.eclipse.jface.widgets.AbstractWidgetFactory

addProperty, cast, create, data, data

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

newTree

public static TreeFactory newTree(int style)

Creates a new TreeFactory with the given style. Refer to Tree(Composite, int) for possible styles.

Returns:

a new TreeFactory instance

linesVisible

public TreeFactory linesVisible(boolean visible)

Marks the receiver's lines as visible if the argument is true, and marks it invisible otherwise. Note that some platforms draw grid lines while others may draw alternating row colors.

Parameters:

visible - the visibility state

Returns:

this

See Also:

• Tree.setLinesVisible(boolean)

headerVisible

public TreeFactory headerVisible(boolean visible)

Marks the receiver's header as visible if the argument is true, and marks it invisible otherwise.

Parameters:

visible - the visibility state

Returns:

this

See Also:

• Tree.setHeaderVisible(boolean)

itemCount

public TreeFactory itemCount(int count)

Sets the number of root-level items contained in the receiver.

Parameters:

count - the number of items

Returns:

this

See Also:

• Tree.setItemCount(int)

onSelect

public TreeFactory onSelect(Consumer<SelectionEvent> consumer)

Creates a SelectionListener and registers it for the widgetSelected event. If the receiver is selected by the user the given consumer is invoked. The SelectionEvent is passed to the consumer.

Parameters:

consumer - the consumer whose accept method is called

Returns:

this

See Also:

• Tree.addSelectionListener(SelectionListener)
• SelectionListener.widgetSelectedAdapter(Consumer)

onCollapse

public TreeFactory onCollapse(Consumer<TreeEvent> consumer)

Creates a TreeListener and registers it for the collapsed event. If the receiver is collapsed by the user the given consumer is invoked. The TreeEvent is passed to the consumer.

Parameters:

consumer - the consumer whose accept method is called

Returns:

this

See Also:

• Tree.addTreeListener(TreeListener)
• SelectionListener.widgetSelectedAdapter(Consumer)

onExpand

public TreeFactory onExpand(Consumer<TreeEvent> consumer)

Creates a TreeListener and registers it for the expanded event. If the receiver is expanded by the user the given consumer is invoked. The TreeEvent is passed to the consumer.

Parameters:

consumer - the consumer whose accept method is called

Returns:

this

See Also:

• Tree.addTreeListener(TreeListener)
• SelectionListener.widgetSelectedAdapter(Consumer)