YogaWidget

Abstract class to add common functionality related to Flex layout to all Widgets.

*This class implements methods related to flex layout required to be present in all widgets**

YogaWidget is an abstract class and hence no instances of the same should be created. It exists so that we can add similar functionalities related to flex layout to all widget's easily. We implement flex layout using a library called Yoga. As part of yoga every widget needs to store its own flex properties such as alignItems, flexDirection etc. This is done with the help of YogaWidget.

const { QWidget } = require("@nodegui/nodegui");

const view = new QWidget();

// getFlexNode is a method from YogaWidget

const flexNode = view.getFlexNode();

YogaWidget helps in storing all flex properties of a widget.

Type parameters

▪ Signals: QObjectSignals

Hierarchy

↳ QObject‹Signals›

↳ YogaWidget

↳ QWidget

Index

Constructors

• constructor

Properties

• native

Methods

• _id
• addEventListener
• children
• delete
• deleteLater
• dumpObjectInfo
• dumpObjectTree
• eventProcessed
• getFlexNode
• inherits
• killTimer
• objectName
• parent
• property
• removeEventListener
• setEventProcessed
• setFlexNodeSizeControlled
• setObjectName
• setParent
• setProperty
• startTimer

Constructors

constructor

+ new YogaWidget(nativeElementOrParent?: NativeElement | QObject): YogaWidget

Inherited from QObject.constructor

Overrides EventWidget.constructor

Parameters:

Name	Type
nativeElementOrParent?	NativeElement | QObject

Returns: YogaWidget

Properties

native

• native: NativeElement | null

Inherited from Component.native

Methods

_id

▸ _id(): number

Inherited from QObject._id

Get an ID identifying the underlying C++ object.

This can be useful when debugging memory problems with help from setLogCreateQObject() and setLogDestroyQObject(). The number is hash of the memory address of the C++ object.

Returns: number

a unique number which is valid for the lifetime of the C++ object.

---

addEventListener

▸ addEventListener‹SignalType›(signalType: SignalType, callback: Signals[SignalType], options?: EventListenerOptions): void

Inherited from EventWidget.addEventListener

Type parameters:

▪ SignalType: keyof Signals

Parameters:

Name	Type	Description
signalType	SignalType	SignalType is a signal from the widgets signals interface.
callback	Signals[SignalType]	Corresponding callback for the signal as mentioned in the widget's signal interface
options?	EventListenerOptions	Extra optional options controlling how this event listener is added.

Returns: void

void

For example in the case of QPushButton:

const button = new QPushButton();

button.addEventListener('clicked',(checked)=>console.log("clicked"));

// here clicked is a value from QPushButtonSignals interface

▸ addEventListener(eventType: WidgetEventTypes, callback: function, options?: EventListenerOptions): void

Inherited from EventWidget.addEventListener

Parameters:

▪ eventType: WidgetEventTypes

▪ callback: function

▸ (event?: NativeRawPointer‹"QEvent"›): void

Parameters:

Name	Type
event?	NativeRawPointer‹"QEvent"›

▪Optional options: EventListenerOptions

Extra optional options controlling how this event listener is added.

For example in the case of QPushButton:

const button = new QPushButton();

button.addEventListener(WidgetEventTypes.HoverEnter,()=>console.log("hovered"));

Returns: void

---

children

▸ children(): QObject[]

Inherited from QObject.children

Returns: QObject[]

---

delete

▸ delete(): void

Inherited from QObject.delete

Returns: void

---

deleteLater

▸ deleteLater(): void

Inherited from QObject.deleteLater

Returns: void

---

dumpObjectInfo

▸ dumpObjectInfo(): void

Inherited from QObject.dumpObjectInfo

Returns: void

---

dumpObjectTree

▸ dumpObjectTree(): void

Inherited from QObject.dumpObjectTree

Returns: void

---

eventProcessed

▸ eventProcessed(): boolean

Inherited from EventWidget.eventProcessed

Get the state of the event processed flag

See setEventProcessed().

Returns: boolean

boolean True if the current event is flagged as processed.

---

getFlexNode

▸ getFlexNode(): FlexNode

Returns: FlexNode

---

inherits

▸ inherits(className: string): boolean

Inherited from QObject.inherits

Parameters:

Name	Type
className	string

Returns: boolean

---

killTimer

▸ killTimer(timerId: number): void

Inherited from QObject.killTimer

Parameters:

Name	Type
timerId	number

Returns: void

---

objectName

▸ objectName(): string

Inherited from QObject.objectName

Returns: string

---

parent

▸ parent(): QObject

Inherited from QObject.parent

Returns: QObject

---

property

▸ property(name: string): QVariant

Inherited from QObject.property

Parameters:

Name	Type
name	string

Returns: QVariant

---

removeEventListener

▸ removeEventListener‹SignalType›(signalType: SignalType, callback: Signals[SignalType], options?: EventListenerOptions): void

Inherited from EventWidget.removeEventListener

Type parameters:

▪ SignalType: keyof Signals

Parameters:

Name	Type
signalType	SignalType
callback	Signals[SignalType]
options?	EventListenerOptions

Returns: void

▸ removeEventListener(eventType: WidgetEventTypes, callback: function, options?: EventListenerOptions): void

Inherited from EventWidget.removeEventListener

Parameters:

▪ eventType: WidgetEventTypes

▪ callback: function

▸ (event?: NativeRawPointer‹"QEvent"›): void

Parameters:

Name	Type
event?	NativeRawPointer‹"QEvent"›

▪Optional options: EventListenerOptions

Returns: void

---

setEventProcessed

▸ setEventProcessed(isProcessed: boolean): void

Inherited from EventWidget.setEventProcessed

Mark the current event as having been processed

This method is used to indicate that the currently dispatched event has been processed and no further processing by superclasses is required. It only makes sense to call this method from an event handler.

When set, this flag will cause NodeGui's QObject::event() method to return true and not call the superclass event(), effectively preventing any further processing on this event.

Parameters:

Name	Type	Description
isProcessed	boolean	true if the event has been processed.

Returns: void

---

setFlexNodeSizeControlled

▸ setFlexNodeSizeControlled(isSizeControlled: boolean): void

sets whether the widget's size is controlled by someone else (for example a window's size is controlled by its frame when dragged).

Parameters:

Name	Type	Description
isSizeControlled	boolean

Returns: void

---

setObjectName

▸ setObjectName(objectName: string): void

Inherited from QObject.setObjectName

Parameters:

Name	Type
objectName	string

Returns: void

---

setParent

▸ setParent(parent: QObject): void

Inherited from QObject.setParent

Parameters:

Name	Type
parent	QObject

Returns: void

---

setProperty

▸ setProperty(name: string, value: QVariantType): boolean

Inherited from QObject.setProperty

Parameters:

Name	Type
name	string
value	QVariantType

Returns: boolean

---

startTimer

▸ startTimer(intervalMS: number, timerType: TimerType): number

Inherited from QObject.startTimer

Parameters:

Name	Type	Default
intervalMS	number	-
timerType	TimerType	TimerType.CoarseTimer

Returns: number