dcl-ui-toolkit v0.10.0

Decentraland UI utils library

A collection of tools for common UI requirements for Decentraland scenes.

• Using the UI utils library
• Text Announcement
• Counter
• Corner Labels
• Bar
• Corner Icons
• Loading icon
• Large image
• Predefined prompt windows
  • Ok Prompt
  • Option Prompt
  • Fill in Prompt
• Custom Prompt Windows
  • Create a custom prompt
  • Customizing close button
  • Add text
  • Add a button
  • Add a Checkbox
  • Add a Switch
  • Add an icon
  • Add an input box
  • Full Custom UI example
• Combine with Custom UI
• Contribute
• CI/CD

Install the library

Via the Decentraland Editor

To use any of the helpers provided by the utils library, follow the steps in Manage Dependencies with Visual Studio Code open on your project folder.

1. Open the Decentraland Editor tab. Note that the bottom section lists all of your project’s currently installed dependencies.

2. Click the + icon on the header of the Dependencies view.

3. Visual Studio opens an input box at the top of the screen. Write dcl-ui-toolkit and press Enter.

4. Import the library into the scene's script. Add this line at the start of your index.ts file, or any other TypeScript files that require it:

import  *  as  ui  from  'dcl-ui-toolkit'

5. Add following to your scene intialization code:

   ReactEcsRenderer.setUiRenderer(ui.render)

6. Add the following permissions for fetching media on the 'scene.json' file. See Required Permissions for more details:

	"requiredPermissions": [
		"ALLOW_MEDIA_HOSTNAMES"
	],
	"allowedMediaHostnames": [
		"decentraland.org"
	],

Via the CLI

To use any of the helpers provided by the utils library

1. Install it as an npm package. Run this command in your scene's project folder:

   npm install dcl-ui-toolkit

2. Run dcl start or dcl build so the dependencies are correctly installed.

3. Import the library into the scene's script. Add this line at the start of your game.ts file, or any other TypeScript files that require it:

   import * as ui from 'dcl-ui-toolkit'

4. Add following to your scene intialization code:

   ReactEcsRenderer.setUiRenderer(ui.render)

5. Add the following permissions for fetching media on the 'scene.json' file. See Required Permissions for more details:

	"requiredPermissions": [
		"ALLOW_MEDIA_HOSTNAMES"
	],
	"allowedMediaHostnames": [
		"decentraland.org"
	],

Text Announcement

To display a text announcement on the center of the screen for a specified amount of time, use the Announcement class.

ReactEcsRenderer.setUiRenderer(ui.render)

const announcement = ui.createComponent(ui.Announcement, { value: 'Text center', duration: 3 })

When instancing, you can pass the following parameters:

• value: string: String to display.
• duration: number = 3: Time to keep the text visible (in seconds). If set to -1, the announcement will remain on screen till it's hidden.
• color: Color4 = Color4.Yellow()*: Text color, as a Color4.
• size: number = 50*: Font size.
• xOffset: number = 0*: Offset from the center on the X axis.
• yOffset: number = 0*: Offset from the center on the Y axis.
• startHidden: boolean = true: If true, the announcement starts invisible till you run its show() function.

Note: options marked with * can later be changed by accessing the relevant properties of the created announcement.

ReactEcsRenderer.setUiRenderer(ui.render)

const announcement = ui.createComponent(ui.Announcement, {
  value: 'Text center',
  startHidden: false,
  duration: 5,
  color: Color4.Red(),
  size: 50,
  xOffset: 100,
  yOffset: -50,
})

announcement.show()

After creating, Announcement has methods to control visibility:

• hide(): void: Hides the announcement.
• show(): void: Shows the announcement (that will be automatically hidden after the specified duration).

pointerEventsSystem.onPointerDown(
  myEntity,
  () => {
    announcement.show()
  },
  {
    button: InputAction.IA_PRIMARY,
    hoverText: 'Show announcement',
  }
)

Announcement components that you can interact with:

• textElement: EntityPropTypes & UiLabelProps: Props for the underlying Label text component.

Counter

To display a number on a corner of the screen that can be easily updated, you can create a UICounter.

ReactEcsRenderer.setUiRenderer(ui.render)

const ammo = ui.createComponent(ui.UICounter, { value: 123 })

When instancing a new counter you can pass the following parameters:

• value: number: Numeric starting value.
• xOffset: number = -40*: Offset on X away from the bottom-right corner.
• yOffset: number = 70*: Offset on Y away from the bottom-right corner.
• color: Color4 = Color4.White()*: Text color.
• size: number = 25*: Text size.
• fixedDigits: number = 0*: Number of digits to use, 0 allows any digits number.
• startHidden: boolean = true: If true, the counter starts invisible till you run its show() function.

Note: options marked with * can later be changed by accessing the relevant properties of the created counter.

ReactEcsRenderer.setUiRenderer(ui.render)

const ammo = ui.createComponent(ui.UICounter, {
  value: 123,
  startHidden: false,
  xOffset: -50,
  yOffset: 100,
  color: Color4.Black(),
  size: 35,
  fixedDigits: 2,
})

//

ammo.xOffset = -100

Once a UICounter object is instanced, you can call the following functions on it:

• read(): number: Returns the current value of the counter.
• increase(amount?: number): void: Increases the number by a given amount. If no parameters are passed, it raises the value by 1.
• decrease(amount?: number): void: Decreases the number by a given amount. If no parameters are passed, it lowers the value by 1.
• set(amount: number): void: Sets the number to a given amount, no matter what the previous value was.
• show(): void: Shows the counter.
• hide(): void: Hides the counter.

pointerEventsSystem.onPointerDown(
  myEntity,
  () => {
    if (ammo.read() <= 0) {
      return
    }

    ammo.decrease()
  },
  {
    button: InputAction.IA_PRIMARY,
    hoverText: 'Click',
  }
)

Counter components that you can interact with:

• textElement: EntityPropTypes & UiLabelProps: Props for the underlying Label text component.

Corner Labels

To display text on the bottom-left corner of the screen, you can create a CornerLabel.

const healthLabel = ui.createComponent(ui.CornerLabel, { value: 'Health: ' })

When instancing a new corner label you can pass the following parameters:

• value: string | number - Text to show.
• xOffset: number = -70*: Offset on X, relative to the bottom-right corner.
• yOffset: number = 40*: Offset on Y, relative to the bottom-right corner.
• color: Color4 = Color4.White()*: Text color.
• size: number = 25*: Text size.
• startHidden: boolean = true: If true, the label starts invisible till you run its show() function.

Note: options marked with * can later be changed by accessing the relevant properties of the created label.

ReactEcsRenderer.setUiRenderer(ui.render)

const healthLabel = ui.createComponent(ui.CornerLabel, {
  value: 'Health: ',
  xOffset: -300,
  yOffset: 70,
  color: Color4.Black(),
  size: 30,
  startHidden: false,
})

healthLabel.show()
//

healthLabel.color = Color4.White()

After the CornerLabel is being instanced, you can call this methods:

• hide(): void: Hides the label.
• show(): void: Shows the label.

pointerEventsSystem.onPointerDown(
  myEntity,
  () => {
    healthLabel.hide()
  },
  {
    button: InputAction.IA_PRIMARY,
    hoverText: 'Exit game',
  }
)

Label components that you can interact with:

• textElement: EntityPropTypes & UiLabelProps: Props for the underlying Label text component.

Bar

To display a bar that can be updated to increase or shorten in length, similar to a typical health bar in games, you can create a UIBar.

ReactEcsRenderer.setUiRenderer(ui.render)

const health = ui.createComponent(ui.UIBar, { value: 0.5 })

When instancing a new bar you can pass the following parameters:

• value: number: Starting value of the bar, from 0 to 1. With 1 the bar is full, with 0 it's empty.
• xOffset: number = -30*: Offset on X away from the bottom-right corner.
• yOffset: number = 60*: Offset on Y away from the bottom-right corner.
• color: Color4: Color4.Red()*: Color of the bar filling.
• style: BarStyles = BarStyles.ROUNDSILVER*: Margin style of the bar, from a list of different predetermined options in different colors and shapes. It takes a value from the BarStyles enum.
• scale: number = 1*: Multiplier to alter the size of the bar proportionally. A scale of 1 = 128 x 32 pixels.
• startHidden: boolean = true: If true, the bar starts invisible till you run its show() function.

Note: options marked with * can later be changed by accessing the relevant properties of the created progress bar.

ReactEcsRenderer.setUiRenderer(ui.render)

const health = ui.createComponent(ui.UIBar, {
  value: 1,
  xOffset: -30,
  yOffset: 130,
  color: Color4.Red(),
  style: ui.BarStyles.ROUNDSILVER,
  scale: 1,
})

health.show()
//

health.scale = 1.25

Once a UIBar object is instanced, you can call the following functions on it:

• read(): number: Returns the current value of the counter.
• increase(amount?: number): void: Increases the number by a given amount. If no parameters are passed, it raises the value by 0.1.
• decrease(amount?: number): void: Decreases the number by a given amount. If no parameters are passed, it lowers the value by 0.1.
• set(value: amount): void: Sets the bar to a given value, no matter what the previous value was.
• hide(): void: Hides the bar.
• show(): void: Shows the bar.

pointerEventsSystem.onPointerDown(
  myEntity,
  () => {
    health.decrease(0.1)
    if (health.read() <= 0) {
      // die
    }
  },
  {
    button: InputAction.IA_PRIMARY,
    hoverText: 'Hit',
  }
)

Progress bar components that you can interact with:

• barElement: EntityPropTypes: Props for the underlying UiEntity wrapper component.
• backgroundElement: EntityPropTypes: Props for UiEntity component that is responsible for the background.
• processElement: EntityPropTypes: Props for UiEntity component that is responsible for displaying the progress.

Corner Icons

To display an icon of on the bottom-left corner of the screen you can create one of the following:

• Icon: generic component that accepts size parameter.
• SmallIcon: by default 32x32 pixels in size.
• MediumIcon: by default 64x64 pixels in size.
• LargeIcon: by default 128x128 pixels in size.

ReactEcsRenderer.setUiRenderer(ui.render)

const mediumIcon = ui.createComponent(ui.MediumIcon, { image: 'images/scene-thumbnail.png' })

mediumIcon.show()

When instancing a new icon you can pass the following parameters:

• image: string*: Path to the image file.
• xOffset: number = -30*: Offset on X, relative to the bottom-right corner.
• yOffset: number = -50*: Offset on Y, relative to the bottom-right corner.
• width?: number*: Image width on screen in pixels. Default value depends on icon's type (32 for SmallIcon, 64 for MediumIcon and 128 for LargeIcon).
• height?: number*: Image height on screen in pixels. Default value depends on icon's type (32 for SmallIcon, 64 for MediumIcon and 128 for LargeIcon).
• size: 'small' | 'medium' | 'large': Icon sizes. Available only for Icon.
• section?: ImageAtlasData*: Use only a section of the image file, useful when arranging multiple icons into an image atlas. This field takes an ImageAtlasData object, specifying sourceWidth, sourceHeight, sourceLeft, sourceTop, atlasWidth and atlasHeight.
• startHidden: boolean = true: If true, the icon starts invisible till you run its show() function.

Note: options marked with * can later be changed by accessing the relevant properties of the created icon.

ReactEcsRenderer.setUiRenderer(ui.render)

const ammoIcon = ui.createComponent(ui.SmallIcon, {
  image: 'images/ammo32.png',
  xOffset: -70,
  yOffset: 70,
  startHidden: false,
})

const healthIcon = ui.createComponent(ui.MediumIcon, {
  image: 'images/heart64.png',
  xOffset: -170,
  yOffset: 120,
})

ammoIcon.show()
healthIcon.show()
//

ammoIcon.yOffset = 50

After the icon is being instanced, you can call this methods to manipulate it's visibility:

• hide(): void: Hides the icon.
• show(): void: Shows the icon.

Icon components that you can interact with:

• imageElement: EntityPropTypes: Props for the underlying UiEntity image component.

Loading icon

To display a loading icon on the center of the screen for a specified amount of time, create a LoadingIcon.

ReactEcsRenderer.setUiRenderer(ui.render)

const loading = ui.createComponent(ui.LoadingIcon, { duration: 3 })

When instancing a new loading icon, you can pass the following parameters:

• duration: number = 0: seconds to display the image onscreen. If not set, or set to 0, it keeps the icon on till you hide it.
• xOffset: number = 0*: Offset on X, relative to the center of the screen.
• yOffset: number = 0*: Offset on Y, relative to the center of the screen.
• scale: number = 1*: Multiplier to alter the size of the icon proportionally. A scale of 1 = 50 x 66 pixels.
• startHidden: boolean = true: If true, the icon starts invisible till you run its show() function.

Note: options marked with * can later be changed by accessing the relevant properties of the created loading icon.

ReactEcsRenderer.setUiRenderer(ui.render)

const loading = ui.createComponent(ui.LoadingIcon, {
  duration: 3,
  xOffset: 0,
  yOffset: 40,
  scale: 0.5,
  startHidden: false,
})

loading.show()
//

loading.scale = 0.75

Once a LoadingIcon object is instanced, you can call this methods:

• hide(): void: Hides the icon.
• show(): void: Shows the icon.

Loading icon components that you can interact with:

• imageElement: EntityPropTypes: Props for the underlying UiEntity image component.

Large image

To display a large image on the center of the screen for a specified amount of time, create a CenterImage. By default images must be 512 x 512 pixels, unless specified.

ReactEcsRenderer.setUiRenderer(ui.render)

const largeImage = ui.createComponent(ui.CenterImage, { image: 'images/Burn.png' })

// ...

largeImage.show()

When instancing a new large image, you can pass the following parameters:

• image: string*: Path to image file.
• duration: number: Seconds to display the image onscreen. -1 keeps it on till you hide it.
• xOffset: number = 0*: Offset on X, relative to the center of the screen.
• yOffset: number = 0*: Offset on Y, relative to the center of the screen.
• width: number = 512*: Image width on screen in pixels.
• height: number = 512*: Image height on screen in pixels.
• section?: ImageAtlasData*: Use only a section of the image file, useful when arranging multiple images into an image atlas. This field takes an ImageAtlasData object, specifying sourceWidth, sourceHeight, sourceLeft, sourceTop, atlasWidth and atlasHeight.
• startHidden: boolean = true: If true, the image starts invisible till you run its show() function. Large images may flash white for a second if created and shown at the same time. By deferring the creation you avoid this artifact.

Note: options marked with * can later be changed by accessing the relevant properties of the created image.

ReactEcsRenderer.setUiRenderer(ui.render)

const gameOver = ui.createComponent(ui.CenterImage, {
  image: 'images/Burn.png',
  duration: 3,
  startHidden: true,
  xOffset: 0,
  yOffset: 0,
  width: 512,
  height: 512,
  section: {
    sourceHeight: 512,
    sourceWidth: 512,
    sourceLeft: 0,
    sourceTop: 0,
    atlasWidth: 1,
    atlasHeight: 1,
  },
})

gameOver.show()

Once a CenterImage object is instanced, you can call the following functions on it:

• show(): void: Shows the image.
• hide(): void: Hides the image.

Large image components that you can interact with:

• imageElement: EntityPropTypes: Props for the underlying UiEntity image component.

Predefined prompt windows

The UI Utils library includes various common prompt windows to display messages and ask players to take an action.

Ok Prompt

Displays a prompt window with a custom message and an OK button. The Ok button can either be clicked or triggered by pressing the E key.

When instancing a new Ok Prompt, you can pass the following parameters:

• text: string: Message string.
• onAccept?: () => void: Function that gets executed if player clicks the button or presses E.
• acceptLabel: string = 'Ok': Label to go in the accept button.
• acceptSize: number | 'auto' = 'auto': Width of the accept button.
• useDarkTheme: boolean = false: Switch the style of the window to the dark theme.
• width: number | 'auto' = 'auto': Width of the prompt.
• height: number | 'auto' = 'auto': Height of the prompt.
• onClose?: () => void: If provided, a callback function that fires when the prompt is closed via the (X) button.
• startHidden: boolean = true: If true, the prompt starts invisible till you run its show() function.

ReactEcsRenderer.setUiRenderer(ui.render)

const prompt = ui.createComponent(ui.OkPrompt, {
  text: 'This is an Ok Prompt',
  onAccept: () => {
    console.log('accepted')
  },
  acceptLabel: 'Ok',
  useDarkTheme: true,
  width: 450,
  height: 300,
  startHidden: false,
})

prompt.show()

Note: If the player closes the window with the close icon, the related onAccept function isn't called.

Once a OkPrompt object is instanced, you can call the following functions on it:

• show(): void: Shows the prompt.
• hide(): void: Hides the prompt.

Note: prompt will not be closed automatically after the user clicks the button or presses the E key. You should close it manually using the hide method.

Prompt parts that you can interact with:

• textElement: PromptText: Main text element of the prompt. Learn more.
• buttonElement: PromptButton: Accept button of the prompt. Learn more.
• closeIcon: PromptCloseIcon: Close icon of the prompt. Learn more.

Option Prompt

Displays a prompt window with a custom message, a title, and two buttons that perform separate actions. The buttons can be clicked or triggered by the E and F keys.

When instancing a new Option Prompt, you can pass the following parameters:

• title: string | number: Header at the top of the window.
• titleSize: number = 24: Size of the header text.
• text: string | number: Smaller print instructions displayed at the center of the prompt.
• textSize: number = 21: Size of the prompt text.
• onAccept?: () => void: Function that gets executed if player clicks accept (left) button or presses the E key.
• acceptSize: number | 'auto' = 'auto': Width of the accept button.
• onReject?: () => void: Function that gets executed if player clicks reject (right) button or presses the F key.
• rejectSize: number | 'auto' = 'auto': Width of the reject button.
• acceptLabel: string = 'Yes': String to go in the accept button
• rejectLabel: string = 'No': String to go in the reject button
• useDarkTheme: boolean = false: Switch the style of the window to the dark theme.
• width: number | 'auto' = 'auto': Width of the prompt.
• height: number | 'auto' = 'auto': Height of the prompt.
• onClose?: () => void: If provided, a callback function that fires when the prompt is closed via the (X) button.
• startHidden: boolean = true: If true, the prompt starts invisible till you run its show() function.

ReactEcsRenderer.setUiRenderer(ui.render)

const prompt = ui.createComponent(ui.OptionPrompt, {
  title: 'Pick an option!',
  text: 'What will you choose?',
  acceptLabel: 'Pick A',
  rejectLabel: 'Pick B',
  onAccept: () => {
    optionPrompt.hide()
    console.log('picked option A')
  },
  onReject: () => {
    optionPrompt.hide()
    console.log('picked option B')
  },
  startHidden: false,
})

prompt.show()

Note: If the player closes the window with the close icon, neither of the functions are called.

Once a OptionPrompt object is instanced, you can call the following functions on it:

• show(): void: Shows the prompt.
• hide(): void: Hides the prompt.

Note: prompt will not be closed automatically after the user clicks buttons or presses the E or F key. You should close it manually using the hide method.

Prompt parts that you can interact with:

• titleElement: PromptText: Title element of the prompt. Learn more.
• textElement: PromptText: Main text element of the prompt. Learn more.
• primaryButtonElement: PromptButton: Primary button of the prompt. Learn more.
• secondaryButtonElement: PromptButton: Secondary button of the prompt. Learn more.
• closeIcon: PromptCloseIcon: Close icon of the prompt. Learn more.

Fill in Prompt

Displays a prompt window with a header, a text field to fill in and a submit button. The value filled into the text box can be used as a parameter in the submit function.

When instancing a new Fill-in Prompt, you can pass the following parameters:

• title: string | number: Header at the top of the window.
• titleSize: number = 24: Size of the header text.
• onAccept: (value: string) => void: Function that gets executed when player clicks the button or presses the E key.
• acceptLabel: string = 'Submit': String to use as label on the submit button.
• acceptSize: number | 'auto' = 'auto': Width of the accept button.
• placeholder: string = 'Fill in': Text to display as placeholder in the text box.
• useDarkTheme: boolean = false: Switch the style of the window to the dark theme.
• width: number | 'auto' = 'auto': Width of the prompt.
• height: number | 'auto' = 'auto': Height of the prompt.
• onClose?: () => void: If provided, a callback function that fires when the prompt is closed via the (X) button.
• startHidden: boolean = true: If true, the prompt starts invisible till you run its show() function.

ReactEcsRenderer.setUiRenderer(ui.render)

const prompt = ui.createComponent(ui.FillInPrompt, {
  title: 'What are you thinking?',
  onAccept: (value: string) => {
    console.log('accepted value:', value)
  },
})

prompt.show()

Note: If the player closes the window with the close icon, the related function isn't called.

Once a FillInPrompt object is instanced, you can call the following functions on it:

• show(): void: Shows the prompt.
• hide(): void: Hides the prompt.

Note: prompt will not be closed automatically after the user clicks the button or presses the E key. You should close it manually using the hide method.

Prompt parts that you can interact with:

• titleElement: PromptText: Title element of the prompt. Learn more.
• inputElement: PromptInput: Input field element of the prompt. Learn more.
• buttonElement: PromptButton: Submit button of the prompt. Learn more.
• closeIcon: PromptCloseIcon: Close icon of the prompt. Learn more.

Custom Prompt Windows

Custom prompt windows let you arrange as many elements as you want into a window, including buttons, text, checkboxes, switches, textboxes and icons.

Create a custom prompt

First create a new CustomPrompt object.

ReactEcsRenderer.setUiRenderer(ui.render)

const prompt = ui.createComponent(ui.CustomPrompt, { style: ui.PromptStyles.DARKSLANTED })

prompt.show()

When instancing a new CustomPrompt, you can pass the following parameters:

• style: PromptStyles = PromptStyles.LIGHT: Pick from a few predefined options, some of them using the dark theme, others the light theme.
• width: number = 400: Background width on screen in pixels. The default size depends on the theme used.
• height: number = 250: Background height on screen in pixels. The default size depends on the theme used.
• startHidden: boolean = true: If true, the prompt starts invisible to load in the background till calling the show() function of the prompt object.
• onClose?: () => void: If provided, a callback function that fires when the prompt is closed via the (X) button.

Note: Stretching the background images away from their default values may lead to blurry corners.

Once you instanced a CustomPrompt object, you can add elements to it by calling its various functions.

You can also call the following functions on it:

• hide: Hides the window.
• show: Shows the window if previously closed.

Access all of the UI elements that make up the prompt UI by calling the elements property of the prompt object.

Customizing close button

When you're creating a prompt, it'll have a close button at the upper right corner. Anytime you can access closeIcon property of PromptCloseIcon type to change some of it's options:

• width: number = 32: Button width.
• height: number = 32: Button height.
• xPosition: number = 10: Offset on X from the top of the window.
• yPosition: number = 10: Offset on X from the right of the window.
• onMouseDown: () => void: Callback that is called when the user clicks on the button.

Note: When changing the onMouseDown, be sure to call the hide method of the related popup's to close it.

Close button components that you can interact with:

• iconElement: EntityPropTypes: Props for the underlying UiEntity image component.

Add text

To add text to a custom prompt, use the addText function.

const promptHeader = prompt.addText({
  value: 'Hello World!',
  xPosition: 0,
  yPosition: 100,
  size: 30,
})

The addText() function can take the following parameters:

• value: string | number: Text to show.
• xPosition: number: Offset on X from the center of the window.
• yPosition: number: Offset on Y from the center of the window.
• color: Color4 = Color4.Black(): Text color.
• size: number = 14: Text size.
• startHidden: boolean = false: If true, text will be invisible till calling the show() function.

Note: you can later change all of this options (except startHidden) by accessing the relevant properties of the created PromptText.

The addText() function returns a PromptText object, that you can then reference to change its values. This object has the following functions that can be called any time:

• hide(): void: Hides the text.
• show(): void: Shows the text.

Text components that you can interact with:

• textElement: EntityPropTypes & UiLabelProps: Props for the underlying Label component.

Add a button

To add a button to a custom prompt, use the addButton function.

const promptButtonE = customPrompt.addButton({
  style: ui.ButtonStyles.E,
  text: 'Yeah',
  xPosition: 0,
  yPosition: 0,
  buttonSize: 200,
  onMouseDown: () => {
    console.log('Yeah pressed')
  },
})

const promptButtonF = customPrompt.addButton({
  style: ui.ButtonStyles.F,
  text: 'Nope',
  xPosition: 0,
  yPosition: -75,
  buttonSize: 'auto',
  onMouseDown: () => {
    console.log('Nope pressed')
  },
})

The addButton function can take the following parameters:

• text: string | number*: Label to show on the button.
• xPosition: number*: Offset on X from the center of the window.
• yPosition: number*: Offset on Y from the center of the window.
• buttonSize: number | auto*: Size of button, auto by default.
• onMouseDown: () => void*: Function to execute when the button is clicked.
• style: PromptButtonStyles = PromptButtonStyles.ROUNDSILVER: Choose out of several predefined style options, with different colors and rounded or square corners.
• startHidden: boolean = false: If true, the button will be invisible till calling the show() function.

Note: options marked with * can later be changed by accessing the relevant properties of the returned PromptButton.

Note: If you pick the E or F style, the buttons will also be triggered when pressing the E or F keys respectively.

The addButton() function returns a PromptButton object, that you can then reference to change its values. This object has the following functions that can be called any time:

• hide(): void
• show(): void
• grayOut(): void: Sets the text to gray and makes it unclickable.
• enable(): void: Sets the text to white and makes it clickable again.

Button components that you can interact with:

• labelElement: EntityPropTypes: Props for the Label component that is responsible for the button label.
• imageElement: EntityPropTypes: Props for the UiEntity component that is responsible for the button background image.
• iconElement: EntityPropTypes: Props for the UiEntity component that is responsible for the button icon.

Add a Checkbox

To add a checkbox to a custom prompt, use the addCheckbox function.

const promptCheckbox = customPrompt.addCheckbox({
  text: "Don't show again",
  xPosition: -80,
  yPosition: 0,
  onCheck: () => {
    console.log('checkbox checked')
  },
  onUncheck: () => {
    console.log('checkbox unchecked')
  },
})

The addCheckbox function can take the following parameters:

• text: string: Label to show next to the checkbox.
• xPosition: number: Offset on X from the center of the window.
• yPosition: number: Offset on Y from the center of the window.
• onCheck?: () => void: Function to execute when the box is checked.
• onUncheck?: () => void: Function to execute when the box is unchecked.
• large: boolean = false: If true, the box size to 32 x 32.
• startChecked: boolean = false: If true, the box starts checked by default.
• startHidden: boolean = false: If true, the checkbox will be invisible till calling the show() function.

Note: you can later change all of this options (except startChecked and startHidden) by accessing the relevant properties of the created PromptCheckbox.

The addCheckbox() function returns a PromptCheckbox object, that you can then reference to change and read its values. This object has the following functions that can be called any time:

• hide(): void
• show(): void
• check(): void: Sets the element to checked, without performing the associated function.
• uncheck(): void: Sets the element to checked, without performing the associated function.

Checkbox components and components that you can interact with:

• imageElement: EntityPropTypes: Props for the UiEntity component that is responsible for the checkbox's box image.
• labelElement: EntityPropTypes & UiLabelProps: Props for the Label component that is responsible for the checkbox label.

Add a Switch

To add a switch to a custom prompt, use the addSwitch function.

const promptSwitch = customPrompt.addSwitch({
  text: 'Turn me',
  xPosition: -60,
  yPosition: 0,
  onCheck: () => {
    console.log('switch checked')
  },
  onUncheck: () => {
    console.log('switch unchecked')
  },
})

The addSwitch function can take the following parameters:

• text: string: Label to show next to the switch.
• xPosition: number: Offset on X from the center of the window.
• yPosition: number: Offset on Y from the center of the window.
• onCheck?: () => void: Function to execute when the switch is activated.
• onUncheck?: () => void: Function to execute when the switch is deactivated.
• style: PromptSwitchStyles = PromptSwitchStyles.ROUNDGREEN: Pick between several sizes, with different colors and rounded or square corners. The value must be from the SwitchStyles enum.
• startChecked: boolean = false: If true, the switch starts activated by default.
• startHidden: boolean = false: If true, the switch will be invisible till calling the show() function.

The addSwitch() function returns a PromptSwitch object, that you can then reference to change and read its values. This object has the following functions that can be called any time:

• hide(): void
• show(): void
• check(): void: Sets the element to checked, without performing the associated function.
• uncheck(): void: Sets the element to checked, without performing the associated function.

Switch has components that you can interact with:

• imageElement: EntityPropTypes: Props for the UiEntity component that is responsible for the switch icon.
• labelElement: EntityPropTypes & UiLabelProps: Props for the Label component that is responsible for the switch label.

Add an icon

To add an icon to a custom prompt, use the addIcon function.

const promptIcon = customPrompt.addIcon({
  image: 'images/scene-thumbnail.png',
})

The addIcon function can take the following parameters:

• image: string: Path to the image file.
• xPosition: number = 0: Offset on X, relative to the window's center.
• yPosition: number = 0: Offset on Y, relative to the window's center.
• width: number = 128: Image width on screen in pixels.
• height: number = 128: Image height on screen in pixels.
• section?: ImageAtlasData: Use only a section of the image file, useful when arranging multiple icons into an image atlas. This field takes an ImageAtlasData object, specifying sourceWidth, sourceHeight, sourceLeft, sourceTop, atlasWidth and atlasHeight.
• startHidden: boolean = false: If true, the switch will be invisible till calling the show() function.

Note: you can later change all of this options (except startHidden) by accessing the relevant properties of the returned PromptIcon.

The addIcon() function returns a PromptIcon object, that you can then reference to change its values. This object has the following functions that can be called any time:

• hide(): void
• show(): void

Icon components that you can interact with:

• imageElement: EntityPropTypes: Props for the underlying UiEntity component.

Add an input box

To add an input box to a custom prompt, use the addTextBox function.

const promptTextBox = customPrompt.addTextBox({
  placeholder: 'Enter text',
  xPosition: 0,
  yPosition: 0,
  onChange: (value) => {
    console.log('textbox changed', value)
  },
})

The addTextBox function can take the following parameters:

• xPosition: number: Offset on X, relative to the window's center.
• yPosition: number: Offset on Y, relative to the window's center.
• placeholder: string | number = 'Fill in': Text to display in the input box before the player interacts with it.
• onChange?: (value: string) => void: Function that gets executed every time the player edits the content on the input box, once for each character changed.
• startHidden: boolean = false: If true, the switch will be invisible till calling the show() function.

Note: you can later change all of this options (except startHidden) by accessing the relevant properties of the returned PromptInput.

The addTextBox() function returns a PromptInput object, that you can then reference to change and read its values. This object has the following functions that can be called any time:

• hide(): void
• show(): void

You can access the last edited value on the textbox by fetching the currentText value of the returned object.

Input components that you can interact with:

• fillInBoxElement: EntityPropTypes & Partial<UiInputProps>: Props for the underlying Input component.

Full Custom UI example

Here's a full example of a custom UI:

ReactEcsRenderer.setUiRenderer(ui.render)

export const customPrompt = ui.createComponent(ui.CustomPrompt, {
  style: ui.PromptStyles.DARKSLANTED,
  height: 600,
})

const promptTitle = customPrompt.addText({
  value: 'What will you do?',
  xPosition: 0,
  yPosition: 250,
  color: Color4.Yellow(),
  size: 30,
})

const promptText = customPrompt.addText({
  value: "It's an important decision",
  xPosition: 0,
  yPosition: 200,
})

const promptCheckbox = customPrompt.addCheckbox({
  text: "Don't show again",
  xPosition: -80,
  yPosition: 150,
  onCheck: () => {
    console.log('checkbox checked')
  },
  onUncheck: () => {
    console.log('checkbox unchecked')
  },
})

const promptSwitch = customPrompt.addSwitch({
  text: 'Turn me',
  xPosition: -60,
  yPosition: 50,
  onCheck: () => {
    console.log('switch checked')
  },
  onUncheck: () => {
    console.log('switch unchecked')
  },
})

const promptTextBox = customPrompt.addTextBox({
  placeholder: 'Enter text',
  xPosition: 0,
  yPosition: 100,
  onChange: (value) => {
    console.log('textbox changed:', value)
  },
})

const promptButtonE = customPrompt.addButton({
  style: ui.ButtonStyles.E,
  text: 'Yeah',
  xPosition: 0,
  yPosition: -150,
  onMouseDown: () => {
    console.log('Yeah clicked')
  },
})

const promptButtonF = customPrompt.addButton({
  style: ui.ButtonStyles.F,
  text: 'Nope',
  xPosition: 0,
  yPosition: -225,
  onMouseDown: () => {
    console.log('Nope clicked')
  },
})

const promptIcon = customPrompt.addIcon({
  image: 'images/scene-thumbnail.png',
  xPosition: 0,
  yPosition: -50,
})

customPrompt.show()

Combine with custom UI

If you want to combine elements from the UI Toolkit with your own custom UI elements in the same scene, you need to render all of the UI via a single call to the ReactEcsRenderer.setUiRenderer function. You can combine both into a single call in the following way:

const uiComponent = () => (
    [
        ui.render(),
        // Functions returning custom UI
    ]
)

ReactEcsRenderer.setUiRenderer(uiComponent)

For example:

const uiComponent = () => (
    [
        ui.render(),
        MyCustomUI()
    ]
)

ReactEcsRenderer.setUiRenderer(uiComponent)


function MyCustomUI() {

	return <UiEntity
		uiTransform={{
			flexDirection: 'column',
			alignItems: 'center',
			justifyContent: 'space-between',
			positionType: 'absolute',
			position: { right: "3%", bottom: '3%' }
		}}
	>
		<Label
			value="Hello World!"
			fontSize={18}
			textAlign="middle-center"
		/>
	</UiEntity>
}

Contribute

In order to test changes made to this repository in active scenes, do the following:

1. Build the project by running npm run build
2. Run npm run link on this repository
3. On the scene directory, after you installed the dependency, run npm link @dcl-sdk/ui-utils

CI/CD

This repository uses semantic-release to automatically release new versions of the package to NPM.

Use the following convention for commit names:

feat: something: Minor release, every time you add a feature or enhancement that doesn’t break the api.

fix: something: Bug fixing / patch

chore: something: Anything that doesn't require a release to npm, like changing the readme. Updating a dependency is not a chore if it fixes a bug or a vulnerability, that's a fix.

If you break the API of the library, you need to do a major release, and that's done a different way. You need to add a second comment that starts with BREAKING CHANGE, like:

commit -m "feat: changed the signature of a method" -m "BREAKING CHANGE: this commit breaks the API, changing foo(arg1) to foo(arg1, arg2)"