Add fyne.TextTruncateMiddle truncation mode#6388
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Adds a new TextTruncation value that shortens overflowing text by inserting an ellipsis in the middle while preserving the beginning and end. Useful for cases like file paths where both ends carry information. The truncated string is pre-computed during line layout and stored on rowBoundary.displayText, which the renderer prefers over the [begin:end] slice when present. MinSize matches the ellipsis mode since the minimum visible content is the same. Fixes fyne-io#6353
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coverage: 59.915% (+0.05%) from 59.869% — mohsenm4:feature/6353-text-truncate-middle into fyne-io:develop |
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Description
Adds
fyne.TextTruncateMiddlealongside the existingOff/Clip/Ellipsismodes. When the text overflows, it shortens with an ellipsis in the middle while preserving the beginning and end — handy for file paths, URLs, etc. where both ends carry information.Closes #6353
How
TextTruncateMiddleconstant intext.go.middleTruncatehelper inwidget/richtext.go— binary search for the largest balanced prefix+ellipsis+suffix that fits the available width.displayTextfield onrowBoundaryso the renderer can substitute a pre-computed string when the slice-based path doesn't fit the use case. MinSize matches the ellipsis mode.Tests
TestText_middleTruncate— helper edge cases (empty, fits whole, only ellipsis fits, balanced split).TestText_lineBounds_truncateMiddle— short text untouched, long text gets the ellipsis with original head/tail preserved.TestLabel_TruncateMiddle— end-to-end on a real Label, asserts the rendered canvas text.