com.badlogic.gdx.scenes.scene2d.ui

Class List<T>

java.lang.Object

com.badlogic.gdx.scenes.scene2d.Actor

com.badlogic.gdx.scenes.scene2d.ui.Widget

com.badlogic.gdx.scenes.scene2d.ui.List<T>

All Implemented Interfaces:

Cullable, Layout

public class List<T>
extends Widget
implements Cullable

A list (aka list box) displays textual items and highlights the currently selected item.

ChangeListener.ChangeEvent is fired when the list selection changes.

The preferred size of the list is determined by the text bounds of the items and the size of the List.ListStyle.selection.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	List.ListStyle The style for a list, see List.

Constructor Summary

Constructors

Constructor and Description
List(List.ListStyle style)
List(Skin skin)
List(Skin skin, java.lang.String styleName)

Method Summary

Modifier and Type	Method and Description
void	clearItems()
void	draw(Batch batch, float parentAlpha) If this method is overridden, the super method or Widget.validate() should be called to ensure the widget is laid out.
protected void	drawBackground(Batch batch, float parentAlpha) Called to draw the background.
protected GlyphLayout	drawItem(Batch batch, BitmapFont font, int index, T item, float x, float y, float width)
protected void	drawSelection(Batch batch, Drawable drawable, float x, float y, float width, float height)
int	getAlignment()
Rectangle	getCullingArea()
T	getItemAt(float y)
float	getItemHeight()
int	getItemIndexAt(float y)
Array<T>	getItems() Returns the internal items array.
InputListener	getKeyListener()
T	getOverItem()
float	getPrefHeight()
float	getPrefWidth()
T	getPressedItem()
T	getSelected() Returns the first selected item, or null.
int	getSelectedIndex()
ArraySelection<T>	getSelection()
List.ListStyle	getStyle() Returns the list's style.
void	layout() Computes and caches any information needed for drawing and, if this actor has children, positions and sizes each child, calls Layout.invalidate() on any each child whose width or height has changed, and calls Layout.validate() on each child.
void	setAlignment(int alignment) Sets the horizontal alignment of the list items.
void	setCullingArea(Rectangle cullingArea)
void	setItems(Array newItems) Sets the items visible in the list, clearing the selection if it is no longer valid.
void	setItems(T... newItems)
void	setSelected(T item) Sets the selection to only the passed item, if it is a possible choice.
void	setSelectedIndex(int index) Sets the selection to only the selected index.
void	setSelection(ArraySelection<T> selection)
void	setStyle(List.ListStyle style)
void	setTypeToSelect(boolean typeToSelect)
java.lang.String	toString(T object)

Methods inherited from class com.badlogic.gdx.scenes.scene2d.ui.Widget

getMaxHeight, getMaxWidth, getMinHeight, getMinWidth, invalidate, invalidateHierarchy, needsLayout, pack, setFillParent, setLayoutEnabled, sizeChanged, validate

Methods inherited from class com.badlogic.gdx.scenes.scene2d.Actor

act, addAction, addCaptureListener, addListener, ancestorsVisible, ascendantsVisible, clear, clearActions, clearListeners, clipBegin, clipBegin, clipEnd, debug, drawDebug, drawDebugBounds, fire, firstAscendant, getActions, getCaptureListeners, getColor, getDebug, getHeight, getListeners, getName, getOriginX, getOriginY, getParent, getRight, getRotation, getScaleX, getScaleY, getStage, getTop, getTouchable, getUserObject, getWidth, getX, getX, getY, getY, getZIndex, hasActions, hasKeyboardFocus, hasParent, hasScrollFocus, hit, isAscendantOf, isDescendantOf, isTouchable, isTouchFocusListener, isTouchFocusTarget, isVisible, localToActorCoordinates, localToAscendantCoordinates, localToParentCoordinates, localToScreenCoordinates, localToStageCoordinates, moveBy, notify, parentToLocalCoordinates, positionChanged, remove, removeAction, removeCaptureListener, removeListener, rotateBy, rotationChanged, scaleBy, scaleBy, scaleChanged, screenToLocalCoordinates, setBounds, setColor, setColor, setDebug, setHeight, setName, setOrigin, setOrigin, setOriginX, setOriginY, setParent, setPosition, setPosition, setRotation, setScale, setScale, setScaleX, setScaleY, setSize, setStage, setTouchable, setUserObject, setVisible, setWidth, setX, setX, setY, setY, setZIndex, sizeBy, sizeBy, stageToLocalCoordinates, toBack, toFront, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

List

public List(Skin skin)

List

public List(Skin skin,
            java.lang.String styleName)

List

public List(List.ListStyle style)

Method Detail

setStyle

public void setStyle(List.ListStyle style)

getStyle

public List.ListStyle getStyle()

Returns the list's style. Modifying the returned style may not have an effect until setStyle(ListStyle) is called.

layout

public void layout()

Description copied from interface: Layout

Computes and caches any information needed for drawing and, if this actor has children, positions and sizes each child, calls Layout.invalidate() on any each child whose width or height has changed, and calls Layout.validate() on each child. This method should almost never be called directly, instead Layout.validate() should be used.

Specified by:

layout in interface Layout

Overrides:

layout in class Widget

draw

public void draw(Batch batch,
                 float parentAlpha)

Description copied from class: Widget

If this method is overridden, the super method or Widget.validate() should be called to ensure the widget is laid out.

Overrides:

draw in class Widget

parentAlpha - The parent alpha, to be multiplied with this actor's alpha, allowing the parent's alpha to affect all children.

drawSelection

protected void drawSelection(Batch batch,
                             @Null
                             Drawable drawable,
                             float x,
                             float y,
                             float width,
                             float height)

drawBackground

protected void drawBackground(Batch batch,
                              float parentAlpha)

Called to draw the background. Default implementation draws the style background drawable.

drawItem

protected GlyphLayout drawItem(Batch batch,
                               BitmapFont font,
                               int index,
                               T item,
                               float x,
                               float y,
                               float width)

getSelection

public ArraySelection<T> getSelection()

setSelection

public void setSelection(ArraySelection<T> selection)

getSelected

@Null
public T getSelected()

Returns the first selected item, or null.

setSelected

public void setSelected(@Null
                        T item)

Sets the selection to only the passed item, if it is a possible choice.

Parameters:

item - May be null.

getSelectedIndex

public int getSelectedIndex()

Returns:

The index of the first selected item. The top item has an index of 0. Nothing selected has an index of -1.

setSelectedIndex

public void setSelectedIndex(int index)

Sets the selection to only the selected index.

Parameters:

index - -1 to clear the selection.

getOverItem

public T getOverItem()

Returns:

May be null.

getPressedItem

public T getPressedItem()

Returns:

May be null.

getItemAt

@Null
public T getItemAt(float y)

Returns:

null if not over an item.

getItemIndexAt

public int getItemIndexAt(float y)

Returns:

-1 if not over an item.

setItems

public void setItems(T... newItems)

setItems

public void setItems(Array newItems)

Sets the items visible in the list, clearing the selection if it is no longer valid. If a selection is Selection.getRequired(), the first item is selected. This can safely be called with a (modified) array returned from getItems().

clearItems

public void clearItems()

getItems

public Array<T> getItems()

Returns the internal items array. If modified, setItems(Array) must be called to reflect the changes.

getItemHeight

public float getItemHeight()

getPrefWidth

public float getPrefWidth()

Specified by:

getPrefWidth in interface Layout

Overrides:

getPrefWidth in class Widget

getPrefHeight

public float getPrefHeight()

Specified by:

getPrefHeight in interface Layout

Overrides:

getPrefHeight in class Widget

toString

public java.lang.String toString(T object)

setCullingArea

public void setCullingArea(@Null
                           Rectangle cullingArea)

Specified by:

setCullingArea in interface Cullable

Parameters:

cullingArea - The culling area in the child actor's coordinates.

getCullingArea

public Rectangle getCullingArea()

Returns:

May be null.

See Also:

setCullingArea(Rectangle)

setAlignment

public void setAlignment(int alignment)

Sets the horizontal alignment of the list items.

Parameters:

alignment - See Align.

getAlignment

public int getAlignment()

setTypeToSelect

public void setTypeToSelect(boolean typeToSelect)

getKeyListener

public InputListener getKeyListener()