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New Feature: Compute the cursor position #134
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0368bce
Added function to compute the cursor position as (line, column), Chan…
Eliulm fd73286
Update Sources/CodeEditTextView/STTextViewController.swift
Eliulm b4a72ec
Update Sources/CodeEditTextView/STTextViewController.swift
Eliulm ab9d27e
Update Sources/CodeEditTextView/STTextViewController.swift
Eliulm c5e72f1
Fixed SwiftLint violations, Extended CodeEditTextView DocC, moved tex…
Eliulm f061ee8
Adapted updateCursorPosition() to benefit from viewport rendering.
Eliulm ea8e462
Added functionality to compute cursor position at last line
Eliulm 4edd7fa
Moved STTextviewController to new folder. Moved cursor logic to STTex…
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103 changes: 103 additions & 0 deletions
103
Sources/CodeEditTextView/Controller/STTextViewController+Cursor.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| // | ||
| // STTextViewController+Cursor.swift | ||
| // | ||
| // | ||
| // Created by Elias Wahl on 15.03.23. | ||
| // | ||
|
|
||
| import Foundation | ||
| import AppKit | ||
|
|
||
| extension STTextViewController { | ||
| func setCursorPosition(_ position: (Int, Int)) { | ||
| guard let provider = textView.textLayoutManager.textContentManager else { | ||
| return | ||
| } | ||
|
|
||
| var (line, column) = position | ||
| let string = textView.string | ||
| if line > 0 { | ||
| if string.isEmpty { | ||
| // If the file is blank, automatically place the cursor in the first index. | ||
| let range = NSRange(string.startIndex..<string.endIndex, in: string) | ||
| if let newRange = NSTextRange(range, provider: provider) { | ||
| _ = self.textView.becomeFirstResponder() | ||
| self.textView.setSelectedRange(newRange) | ||
| return | ||
| } | ||
| } | ||
|
|
||
| string.enumerateSubstrings(in: string.startIndex..<string.endIndex) { _, lineRange, _, done in | ||
| line -= 1 | ||
| if line < 1 { | ||
| // If `column` exceeds the line length, set cursor to the end of the line. | ||
| let index = min(lineRange.upperBound, string.index(lineRange.lowerBound, offsetBy: column - 1)) | ||
| if let newRange = NSTextRange(NSRange(index..<index, in: string), provider: provider) { | ||
| self.textView.setSelectedRange(newRange) | ||
| } | ||
| done = true | ||
| } else { | ||
| done = false | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func updateCursorPosition() { | ||
| guard let textLayoutManager = textView.textLayoutManager as NSTextLayoutManager?, | ||
| let textContentManager = textLayoutManager.textContentManager as NSTextContentManager?, | ||
| let insertionPointLocation = textLayoutManager.insertionPointLocation, | ||
| let documentStartLocation = textLayoutManager.documentRange.location as NSTextLocation?, | ||
| let documentEndLocation = textLayoutManager.documentRange.endLocation as NSTextLocation? | ||
| else { | ||
| return | ||
| } | ||
|
|
||
| let textElements = textContentManager.textElements( | ||
| for: NSTextRange(location: textLayoutManager.documentRange.location, end: insertionPointLocation)!) | ||
| var line = textElements.count | ||
|
|
||
| textLayoutManager.enumerateTextSegments( | ||
| in: NSTextRange(location: insertionPointLocation), | ||
| type: .standard, | ||
| options: [.rangeNotRequired, .upstreamAffinity] | ||
| ) { _, textSegmentFrame, _, _ -> Bool | ||
| in | ||
| var col = 1 | ||
| /// If the cursor is at the end of the document: | ||
| if textLayoutManager.offset(from: insertionPointLocation, to: documentEndLocation) == 0 { | ||
| /// If document is empty: | ||
| if textLayoutManager.offset(from: documentStartLocation, to: documentEndLocation) == 0 { | ||
| self.cursorPosition.wrappedValue = (1, 1) | ||
| return false | ||
| } | ||
| guard let cursorTextFragment = textLayoutManager.textLayoutFragment(for: textSegmentFrame.origin), | ||
| let cursorTextLineFragment = cursorTextFragment.textLineFragments.last | ||
| else { return false } | ||
|
|
||
| col = cursorTextLineFragment.characterRange.length + 1 | ||
| if col == 1 { line += 1 } | ||
| } else { | ||
| guard let cursorTextLineFragment = textLayoutManager.textLineFragment(at: insertionPointLocation) | ||
| else { return false } | ||
|
|
||
| /// +1, because we start with the first character with 1 | ||
| let tempCol = cursorTextLineFragment.characterIndex(for: textSegmentFrame.origin) | ||
| let result = tempCol.addingReportingOverflow(1) | ||
|
|
||
| if !result.overflow { col = result.partialValue } | ||
| /// If cursor is at end of line add 1: | ||
| if cursorTextLineFragment.characterRange.length != 1 && | ||
| (cursorTextLineFragment.typographicBounds.width == (textSegmentFrame.maxX + 5.0)) { | ||
| col += 1 | ||
| } | ||
|
|
||
| /// If cursor is at first character of line, the current line is not being included | ||
| if col == 1 { line += 1 } | ||
| } | ||
|
|
||
| self.cursorPosition.wrappedValue = (line, col) | ||
| return false | ||
| } | ||
| } | ||
| } |
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