wesley/swiftui-math
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[UI] add line wrapping functionality

Browse Source
This commit is contained in:
Nicolas Guillot
2025-10-02 12:05:37 +02:00
parent 11f57f7c6e
commit c7198ad9af
4 changed files with 567 additions and 39 deletions
Download Patch File Download Diff File Expand all files Collapse all files

64
Sources/SwiftMath/MathRender/MTMathUILabel.swift Executable file → Normal file
View File

@@ -179,7 +179,19 @@ public class MTMathUILabel : MTView {
/** The internal display of the MTMathUILabel. This is for advanced use only. */
public var displayList: MTMathListDisplay? { _displayList }
private var _displayList:MTMathListDisplay?
/** The preferred maximum width (in points) for a multiline label.
Set this property to enable line wrapping based on available width. */
public var preferredMaxLayoutWidth: CGFloat {
set {
_preferredMaxLayoutWidth = newValue
self.invalidateIntrinsicContentSize()
self.setNeedsLayout()
}
get { _preferredMaxLayoutWidth }
}
private var _preferredMaxLayoutWidth: CGFloat = 0
public var currentStyle:MTLineStyle {
switch _labelMode {
case .display: return .display
@@ -241,8 +253,12 @@ public class MTMathUILabel : MTView {
func _layoutSubviews() {
if _mathList != nil {
// Use the effective width for layout
let effectiveWidth = _preferredMaxLayoutWidth > 0 ? _preferredMaxLayoutWidth : bounds.size.width
let availableWidth = effectiveWidth - contentInsets.left - contentInsets.right
// print("Pre list = \(_mathList!)")
_displayList = MTTypesetter.createLineForMathList(_mathList, font: font, style: currentStyle)
_displayList = MTTypesetter.createLineForMathList(_mathList, font: font, style: currentStyle, maxWidth: availableWidth)
_displayList!.textColor = textColor
// print("Post list = \(_mathList!)")
var textX = CGFloat(0)
@@ -252,7 +268,7 @@ public class MTMathUILabel : MTView {
case .right: textX = bounds.size.width - _displayList!.width - contentInsets.right
}
let availableHeight = bounds.size.height - contentInsets.bottom - contentInsets.top
// center things vertically
var height = _displayList!.ascent + _displayList!.descent
if height < fontSize/2 {
@@ -268,19 +284,47 @@ public class MTMathUILabel : MTView {
}
func _sizeThatFits(_ size:CGSize) -> CGSize {
guard _mathList != nil else { return size }
var size = size
guard _mathList != nil else {
// No content - return no-intrinsic-size marker
return CGSize(width: -1, height: -1)
}
// Determine the maximum width to use
var maxWidth: CGFloat = 0
if _preferredMaxLayoutWidth > 0 {
maxWidth = _preferredMaxLayoutWidth - contentInsets.left - contentInsets.right
} else if size.width > 0 {
maxWidth = size.width - contentInsets.left - contentInsets.right
}
var displayList:MTMathListDisplay? = nil
displayList = MTTypesetter.createLineForMathList(_mathList, font: font, style: currentStyle)
size.width = displayList!.width + contentInsets.left + contentInsets.right
size.height = displayList!.ascent + displayList!.descent + contentInsets.top + contentInsets.bottom
return size
displayList = MTTypesetter.createLineForMathList(_mathList, font: font, style: currentStyle, maxWidth: maxWidth)
guard displayList != nil else {
// Failed to create display list
return CGSize(width: -1, height: -1)
}
let resultWidth = displayList!.width + contentInsets.left + contentInsets.right
let resultHeight = displayList!.ascent + displayList!.descent + contentInsets.top + contentInsets.bottom
return CGSize(width: resultWidth, height: resultHeight)
}
#if os(macOS)
public func sizeThatFits(_ size: CGSize) -> CGSize {
return _sizeThatFits(size)
}
#else
public override func sizeThatFits(_ size: CGSize) -> CGSize {
return _sizeThatFits(size)
}
#endif
#if os(macOS)
func setNeedsDisplay() { self.needsDisplay = true }
func setNeedsLayout() { self.needsLayout = true }
public override var fittingSize: CGSize { _sizeThatFits(CGSizeZero) }
public override var intrinsicContentSize: CGSize { _sizeThatFits(CGSizeZero) }
override public var isFlipped: Bool { false }
override public func layout() {
self._layoutSubviews()