[AddComponentMenu("UI/Dropdown - TextMeshPro", 35)]
[RequireComponent(typeof(RectTransform))]
public class TMP_Dropdown : Selectable, IMoveHandler, IPointerDownHandler, IPointerUpHandler, IPointerEnterHandler, IPointerExitHandler, ISelectHandler, IDeselectHandler, IPointerClickHandler, ISubmitHandler, ICancelHandler, IEventSystemHandler

Constructors

TMP_Dropdown()

Declaration

protected TMP_Dropdown()

Properties

alphaFadeSpeed

The time interval at which a drop down will appear and disappear

Declaration

public float alphaFadeSpeed { get; set; }

Property Value

Type	Description
Single

captionImage

The Image component to hold the image of the currently selected option.

Declaration

public Image captionImage { get; set; }

Property Value

Type	Description
Image

captionText

The Text component to hold the text of the currently selected option.

Declaration

public TMP_Text captionText { get; set; }

Property Value

Type	Description
TMP_Text

IsExpanded

Declaration

public bool IsExpanded { get; }

Property Value

Type	Description
Boolean

itemImage

The Image component to hold the image of the item

Declaration

public Image itemImage { get; set; }

Property Value

Type	Description
Image

itemText

The Text component to hold the text of the item.

Declaration

public TMP_Text itemText { get; set; }

Property Value

Type	Description
TMP_Text

MultiSelect

Declaration

public bool MultiSelect { get; set; }

Property Value

Type	Description
Boolean

onValueChanged

Declaration

public TMP_Dropdown.DropdownEvent onValueChanged { get; set; }

Property Value

Type	Description
TMP_Dropdown.DropdownEvent

options

Declaration

public List<TMP_Dropdown.OptionData> options { get; set; }

Property Value

Type	Description
List<TMP_Dropdown.OptionData>

placeholder

The placeholder Graphic component. Shown when no option is selected.

Declaration

public Graphic placeholder { get; set; }

Property Value

Type	Description
Graphic

template

The Rect Transform of the template for the dropdown list.

Declaration

public RectTransform template { get; set; }

Property Value

Type	Description
RectTransform

value

Declaration

public int value { get; set; }

Property Value

Type	Description
Int32

Methods

AddOptions(List<String>)

Declaration

public void AddOptions(List<string> options)

Parameters

Type	Name	Description
List<String>	options

AddOptions(List<TMP_Dropdown.OptionData>)

Declaration

public void AddOptions(List<TMP_Dropdown.OptionData> options)

Parameters

Type	Name	Description
List<TMP_Dropdown.OptionData>	options

AddOptions(List<Sprite>)

Declaration

public void AddOptions(List<Sprite> options)

Parameters

Type	Name	Description
List<Sprite>	options

Awake()

Declaration

protected override void Awake()

Overrides

Selectable.Awake()

ClearOptions()

Clear the list of options in the Dropdown.

Declaration

public void ClearOptions()

CreateBlocker(Canvas)

Create a blocker that blocks clicks to other controls while the dropdown list is open.

Declaration

protected virtual GameObject CreateBlocker(Canvas rootCanvas)

Parameters

Type	Name	Description
Canvas	rootCanvas	The root canvas the dropdown is under.

Returns

Type	Description
GameObject	The created blocker object

Remarks

Override this method to implement a different way to obtain a blocker GameObject.

CreateDropdownList(GameObject)

Create the dropdown list to be shown when the dropdown is clicked. The dropdown list should correspond to the provided template GameObject, equivalent to instantiating a copy of it.

Declaration

protected virtual GameObject CreateDropdownList(GameObject template)

Parameters

Type	Name	Description
GameObject	template	The template to create the dropdown list from.

Returns

Type	Description
GameObject	The created drop down list gameobject.

Remarks

Override this method to implement a different way to obtain a dropdown list GameObject.

CreateItem(TMP_Dropdown.DropdownItem)

Create a dropdown item based upon the item template.

Declaration

protected virtual TMP_Dropdown.DropdownItem CreateItem(TMP_Dropdown.DropdownItem itemTemplate)

Parameters

Type	Name	Description
TMP_Dropdown.DropdownItem	itemTemplate	e template to create the option item from.

Returns

Type	Description
TMP_Dropdown.DropdownItem	The created dropdown item component

Remarks

Override this method to implement a different way to obtain an option item. The option item should correspond to the provided template DropdownItem and its GameObject, equivalent to instantiating a copy of it.

DestroyBlocker(GameObject)

Convenience method to explicitly destroy the previously generated blocker object

Declaration

protected virtual void DestroyBlocker(GameObject blocker)

Parameters

Type	Name	Description
GameObject	blocker	The blocker object to destroy.

Remarks

Override this method to implement a different way to dispose of a blocker GameObject that blocks clicks to other controls while the dropdown list is open.

DestroyDropdownList(GameObject)

Convenience method to explicitly destroy the previously generated dropdown list

Declaration

protected virtual void DestroyDropdownList(GameObject dropdownList)

Parameters

Type	Name	Description
GameObject	dropdownList	The dropdown list GameObject to destroy

Remarks

Override this method to implement a different way to dispose of a dropdown list GameObject.

DestroyItem(TMP_Dropdown.DropdownItem)

Convenience method to explicitly destroy the previously generated Items.

Declaration

protected virtual void DestroyItem(TMP_Dropdown.DropdownItem item)

Parameters

Type	Name	Description
TMP_Dropdown.DropdownItem	item	The Item to destroy.

Remarks

Override this method to implement a different way to dispose of an option item. Likely no action needed since destroying the dropdown list destroys all contained items as well.

Hide()

Hide the dropdown list. I.e. close it.

Declaration

public void Hide()

OnCancel(BaseEventData)

This will hide the dropdown list.

Declaration

public virtual void OnCancel(BaseEventData eventData)

Parameters

Type	Name	Description
BaseEventData	eventData	The associated event data.

Implements

ICancelHandler.OnCancel(BaseEventData)

Remarks

Called by a BaseInputModule when a Cancel event occurs.

OnDisable()

Declaration

protected override void OnDisable()

Overrides

Selectable.OnDisable()

OnPointerClick(PointerEventData)

Handling for when the dropdown is initially 'clicked'. Typically shows the dropdown

Declaration

public virtual void OnPointerClick(PointerEventData eventData)

Parameters

Type	Name	Description
PointerEventData	eventData	The associated event data.

Implements

IPointerClickHandler.OnPointerClick(PointerEventData)

OnSubmit(BaseEventData)

Handling for when the dropdown is selected and a submit event is processed. Typically shows the dropdown

Declaration

public virtual void OnSubmit(BaseEventData eventData)

Parameters

Type	Name	Description
BaseEventData	eventData	The associated event data.

Implements

ISubmitHandler.OnSubmit(BaseEventData)

RefreshShownValue()

Refreshes the text and image (if available) of the currently selected option.

Declaration

public void RefreshShownValue()

Remarks

If you have modified the list of options, you should call this method afterwards to ensure that the visual state of the dropdown corresponds to the updated options.

SetValueWithoutNotify(Int32)

Set index number of the current selection in the Dropdown without invoking onValueChanged callback.

Declaration

public void SetValueWithoutNotify(int input)

Parameters

Type	Name	Description
Int32	input	The new index for the current selection.

Show()

Show the dropdown.

Plan for dropdown scrolling to ensure dropdown is contained within screen.

We assume the Canvas is the screen that the dropdown must be kept inside. This is always valid for screen space canvas modes. For world space canvases we don't know how it's used, but it could be e.g. for an in-game monitor. We consider it a fair constraint that the canvas must be big enough to contain dropdowns.

Declaration

public void Show()

Start()

Declaration

protected override void Start()

Overrides

UIBehaviour.Start()