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Text.js
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Text.js
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import { DefinedPropertiesKey } from '../WrappedObject'
import { StyledLayer } from './StyledLayer'
import { Rectangle } from '../models/Rectangle'
import { Types } from '../enums'
import { Factory } from '../Factory'
const TextBehaviour = {
flexibleWidth: 0, // Width is adjusted to fit the content.
fixedWidth: 1, // Width is fixed.
}
const TextLineSpacingBehaviour = {
variable: 'variable', // Uses min & max line height on paragraph style
constantBaseline: 'constantBaseline', // Uses MSConstantBaselineTypesetter for fixed line height
}
export const TextLineSpacingBehaviourMap = {
variable: 1, // Uses min & max line height on paragraph style
constantBaseline: 2, // Uses MSConstantBaselineTypesetter for fixed line height
}
// Mapping between text alignment names and values.
const TextAlignment = {
left: 'left', // Visually left aligned
right: 'right', // Visually right aligned
center: 'center', // Visually centered
justified: 'justified', // Fully-justified. The last line in a paragraph is natural-aligned.
natural: 'natural', // Indicates the default alignment for script
}
export const TextAlignmentMap = {
left: 0, // Visually left aligned
right: 1, // Visually right aligned
center: 2, // Visually centered
justified: 3, // Fully-justified. The last line in a paragraph is natural-aligned.
natural: 4, // Indicates the default alignment for script
}
// Mapping between vertical text alignment names and values.
const VerticalTextAlignment = {
top: 'top', // Visually top aligned
center: 'center', // Visually center aligned
bottom: 'bottom', // Visually bottom aligned
}
export const VerticalTextAlignmentMap = {
top: 0, // Visually top aligned
center: 1, // Visually centered
bottom: 2, // Visually bottom aligned
}
/**
* Represents a text layer.
*/
export class Text extends StyledLayer {
/**
* Make a new text object.
*
* @param [Object] properties - The properties to set on the object as a JSON object.
* If `sketchObject` is provided, will wrap it.
* Otherwise, creates a new native object.
*/
constructor(text = {}) {
if (!text.sketchObject) {
// eslint-disable-next-line no-param-reassign
text.sketchObject = Factory.createNative(Text)
.alloc()
.initWithFrame(new Rectangle(0, 0, 100, 100).asCGRect())
}
super(text)
this.adjustToFit()
}
/**
* Set the font of the layer to an NSFont object.
*
* @param {NSFont} value The font to use.
*/
set font(value) {
if (this.isImmutable()) {
return
}
this._object.font = value
}
/**
* Set the font of the layer to the system font at a given size.
*
* @param {number} size The system font size to use.
*/
set systemFontSize(size) {
if (this.isImmutable()) {
return
}
this._object.setFont(NSFont.systemFontOfSize_(size))
}
/**
* Adjust the frame of the layer to fit its contents.
*/
adjustToFit() {
if (this.isImmutable()) {
return this
}
this._object.adjustFrameToFit()
return this
}
/**
* Return a list of the text fragments for the text.
*
* @return {array} The line fragments. Each one is a dictionary containing a rectangle, and a baseline offset.
*/
get fragments() {
const { text } = this
const textLayer = this._object
const storage = this.isImmutable()
? textLayer.createTextStorage()
: textLayer.immutableModelObject().createTextStorage()
const layout = storage.layoutManagers().firstObject()
const textContainer = layout.textContainers().firstObject()
const numberOfGlyphs = layout.numberOfGlyphs()
const drawingPoint = textLayer.drawingPointForText()
const fragments = []
let currentLocation = 0
while (currentLocation < numberOfGlyphs) {
// Get end of line index
const lineRangeStorage = NSMakeRange(0, 0)
const lineRangePtr = MOPointer.alloc().initWithValue(lineRangeStorage)
layout.lineFragmentRectForGlyphAtIndex_effectiveRange(
currentLocation,
lineRangePtr
)
const range = lineRangePtr.value()
const endOfLineIndex = NSMaxRange(range)
// Get bounding rect
// Also ignore empty line ends and hard line breaks
let rangeLength =
Math.min(endOfLineIndex, numberOfGlyphs) - currentLocation
const lineText = text.substr(currentLocation, rangeLength)
const trimmedLineText = lineText.trimRight()
rangeLength -= lineText.length - trimmedLineText.length
const glyphRange = NSMakeRange(currentLocation, rangeLength)
const lineRect = layout.boundingRectForGlyphRange_inTextContainer(
glyphRange,
textContainer
)
const rect = new Rectangle(
lineRect.origin.x + drawingPoint.x,
lineRect.origin.y + drawingPoint.y,
lineRect.size.width,
lineRect.size.height
)
// get baseline offset
const baselineOffset = layout
.typesetter()
.baselineOffsetInLayoutManager_glyphIndex(layout, currentLocation)
fragments.push({
rect,
baselineOffset,
range,
})
// move to the next line
currentLocation = endOfLineIndex
}
return fragments
}
}
Text.type = Types.Text
Text[DefinedPropertiesKey] = { ...StyledLayer[DefinedPropertiesKey] }
Factory.registerClass(Text, MSTextLayer)
Factory.registerClass(Text, MSImmutableTextLayer)
Text.define('text', {
get() {
return String(this._object.stringValue())
},
/**
* Set the text of the layer.
* If the layer hasn't explicitly been given a name, this will also change
* the layer's name to the text value.
*
* @param {string} value The text to use.
*/
set(value) {
if (this.isImmutable()) {
return
}
const object = this._object
object.stringValue = value
if (!object.nameIsFixed()) {
object.name = value
}
},
})
Text.Alignment = TextAlignment
Text.define('alignment', {
/**
* The alignment of the layer.
* This will be one of the values: "left", "center", "right", "justified", "natural".
*
* @return {string} The alignment mode.
*/
get() {
const raw = this._object.textAlignment()
return (
Object.keys(TextAlignmentMap).find(
key => TextAlignmentMap[key] === raw
) || raw
)
},
/**
* Set the alignment of the layer.
*
* The mode supplied can be a string or a number.
* If it's a string, it should be one of the values: "left", "center", "right", "justified", "natural".
*
* @param {string} mode The alignment mode to use.
*/
set(mode) {
if (this.isImmutable()) {
return
}
const translated = TextAlignmentMap[mode]
this._object.textAlignment =
typeof translated !== 'undefined' ? translated : mode
},
})
Text.VerticalAlignment = VerticalTextAlignment
Text.LineSpacing = TextLineSpacingBehaviour
Text.define('lineSpacing', {
get() {
const raw = this._object.lineSpacingBehaviour()
return (
Object.keys(TextLineSpacingBehaviourMap).find(
key => TextLineSpacingBehaviourMap[key] === raw
) || raw
)
},
set(mode) {
if (this.isImmutable()) {
return
}
const translated = TextLineSpacingBehaviourMap[mode]
const lineSpacingBehaviour =
typeof translated !== 'undefined' ? translated : mode
const textLayer = this._object
const layout = textLayer.immutableModelObject().textLayout()
const initialBaselineOffset = layout.firstBaselineOffset()
textLayer.lineSpacingBehaviour = lineSpacingBehaviour
const baselineOffset = layout.firstBaselineOffset()
const rect = this.frame
rect.y -= baselineOffset - initialBaselineOffset
this.frame = rect
},
})
Text.define('fixedWidth', {
get() {
return this._object.textBehaviour() === TextBehaviour.fixedWidth
},
set(fixed) {
if (this.isImmutable()) {
return
}
if (fixed) {
this._object.textBehaviour = TextBehaviour.fixedWidth
} else {
this._object.textBehaviour = TextBehaviour.flexibleWidth
}
},
})