Class CheckBox

java.lang.Object

com.googlecode.lanterna.gui2.AbstractComponent<CheckBox>

com.googlecode.lanterna.gui2.AbstractInteractableComponent<CheckBox>

com.googlecode.lanterna.gui2.CheckBox

All Implemented Interfaces:

Component, Interactable, TextGUIElement

public class CheckBox
extends AbstractInteractableComponent<CheckBox>

The checkbox component looks like a regular checkbox that you can find in modern graphics user interfaces, a label and a space that the user can toggle on and off by using enter or space keys.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	CheckBox.CheckBoxRenderer	Helper interface that doesn't add any new methods but makes coding new check box renderers a little bit more clear
static class	CheckBox.DefaultCheckBoxRenderer	The default renderer that is used unless overridden.
static interface	CheckBox.Listener	Listener interface that can be used to catch user events on the check box

Nested classes/interfaces inherited from interface Interactable

Interactable.FocusChangeDirection, Interactable.Result

Field Summary

Fields

Modifier and Type	Field	Description
private boolean	checked
private String	label
private final List<CheckBox.Listener>	listeners

Constructor Summary

Constructors

Constructor	Description
CheckBox()	Creates a new checkbox with no label, initially set to un-checked
CheckBox(String label)	Creates a new checkbox with a specific label, initially set to un-checked

Method Summary

Modifier and Type	Method	Description
CheckBox	addListener(CheckBox.Listener listener)	Adds a listener to this check box so that it will be notificed on certain user actions
protected CheckBox.CheckBoxRenderer	createDefaultRenderer()	When you create a custom component, you need to implement this method and return a Renderer which is responsible for taking care of sizing the component, rendering it and choosing where to place the cursor (if Interactable).
String	getLabel()	Returns the label of check box
Interactable.Result	handleKeyStroke(KeyStroke keyStroke)	This method can be overridden to handle various user input (mostly from the keyboard) when this component is in focus.
boolean	isChecked()	Returns the checked state of this check box
CheckBox	removeListener(CheckBox.Listener listener)	Removes a listener from this check box so that, if it was previously added, it will no long receive any events
CheckBox	setChecked(boolean checked)	Programmatically updated the check box to a particular checked state
CheckBox	setLabel(String label)	Updates the label of the checkbox

Methods inherited from class AbstractInteractableComponent

afterEnterFocus, afterLeaveFocus, getCursorLocation, getInputFilter, getRenderer, handleInput, isActivationStroke, isEnabled, isFocusable, isFocused, isKeyboardActivationStroke, isMouseActivationStroke, isMouseDown, isMouseDrag, isMouseMove, isMouseUp, onEnterFocus, onLeaveFocus, setEnabled, setInputFilter, takeFocus

Methods inherited from class AbstractComponent

addTo, calculatePreferredSize, draw, getBasePane, getGlobalPosition, getLayoutData, getParent, getPosition, getPreferredSize, getSize, getTextGUI, getTheme, getThemeDefinition, hasParent, invalidate, isInside, isInvalid, isVisible, onAdded, onAfterDrawing, onBeforeDrawing, onRemoved, runOnGUIThreadIfExistsOtherwiseRunDirect, self, setLayoutData, setPosition, setPreferredSize, setRenderer, setSize, setTheme, setVisible, toBasePane, toGlobal, withBorder

Methods inherited from class Object

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

Methods inherited from interface Component

addTo, getBasePane, getGlobalPosition, getLayoutData, getParent, getPosition, getPreferredSize, getSize, getTextGUI, getTheme, getThemeDefinition, hasParent, invalidate, isInside, isVisible, onAdded, onRemoved, setLayoutData, setPosition, setPreferredSize, setSize, setTheme, setVisible, toBasePane, toGlobal, withBorder

Methods inherited from interface TextGUIElement

draw, isInvalid

Field Details

listeners

private final List<CheckBox.Listener> listeners

label

private String label

checked

private boolean checked

Constructor Details

CheckBox

public CheckBox()

Creates a new checkbox with no label, initially set to un-checked

CheckBox

public CheckBox(String label)

Creates a new checkbox with a specific label, initially set to un-checked

Parameters:

label - Label to assign to the check box

Method Details

setChecked

public CheckBox setChecked(boolean checked)

Programmatically updated the check box to a particular checked state

Parameters:

checked - If true, the check box will be set to toggled on, otherwise false

Returns:

Itself

isChecked

public boolean isChecked()

Returns the checked state of this check box

Returns:

true if the check box is toggled on, otherwise false

handleKeyStroke

public Interactable.Result handleKeyStroke(KeyStroke keyStroke)

Description copied from class: AbstractInteractableComponent

This method can be overridden to handle various user input (mostly from the keyboard) when this component is in focus. The input method from the interface, handleInput(..) is final in AbstractInteractableComponent to ensure the input filter is properly handled. If the filter decides that this event should be processed, it will call this method.

Overrides:

handleKeyStroke in class AbstractInteractableComponent<CheckBox>

Parameters:

keyStroke - What input was entered by the user

Returns:

Result of processing the key-stroke

setLabel

public CheckBox setLabel(String label)

Updates the label of the checkbox

Parameters:

label - New label to assign to the check box

Returns:

Itself

getLabel

public String getLabel()

Returns the label of check box

Returns:

Label currently assigned to the check box

addListener

public CheckBox addListener(CheckBox.Listener listener)

Adds a listener to this check box so that it will be notificed on certain user actions

Parameters:

listener - Listener to fire events on

Returns:

Itself

removeListener

public CheckBox removeListener(CheckBox.Listener listener)

Removes a listener from this check box so that, if it was previously added, it will no long receive any events

Parameters:

listener - Listener to remove from the check box

Returns:

Itself

createDefaultRenderer

protected CheckBox.CheckBoxRenderer createDefaultRenderer()

Description copied from class: AbstractComponent

When you create a custom component, you need to implement this method and return a Renderer which is responsible for taking care of sizing the component, rendering it and choosing where to place the cursor (if Interactable). This value is intended to be overridden by custom themes.

Specified by:

createDefaultRenderer in class AbstractInteractableComponent<CheckBox>

Returns:

Renderer to use when sizing and drawing this component