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Calculate the available width from a closer LayoutBuilder #2

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Merged
blazetill merged 1 commit into from
Sep 24, 2025
Merged

Calculate the available width from a closer LayoutBuilder #2

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50 changes: 28 additions & 22 deletions lib/src/code_field/code_field.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -401,27 +401,6 @@ class _CodeFieldState extends State<CodeField> {
),
child: LayoutBuilder(
builder: (context, constraints) {
// Save the textStyle and available width so _onTextChanged can
// accurately compute the amount of visual lines when wrapping.
_currentTextStyle = textStyle;
// Subtract left padding that will be applied inside the
// SingleChildScrollView when horizontal scrolling is disabled.
var availableWidth = constraints.maxWidth;
if (widget.lineNumbers) {
availableWidth -= widget.lineNumberStyle.width;
}

if ((availableWidth - _codeColumnWidth).abs() > 0.5) {
_codeColumnWidth = max(0, availableWidth);
// Recalculate the line numbers because wrapping may have
// changed due to a width change.
WidgetsBinding.instance.addPostFrameCallback((_) {
if (mounted) {
_onTextChanged();
}
});
}

// Control horizontal scrolling
return widget.wrap
? codeField
Expand All @@ -438,7 +417,34 @@ class _CodeFieldState extends State<CodeField> {
crossAxisAlignment: CrossAxisAlignment.start,
children: [
if (widget.lineNumbers && numberCol != null) numberCol,
Expanded(child: codeCol),
Expanded(
child: LayoutBuilder(
builder: (context, constraints) {
// Save the textStyle and available width so _onTextChanged can
// accurately compute the amount of visual lines when wrapping.
_currentTextStyle = textStyle;
// Subtract left padding that will be applied inside the
// SingleChildScrollView when horizontal scrolling is disabled.
var availableWidth = constraints.maxWidth;

const caretMargin = 3.0; // 1 gap + 2 cursor
availableWidth -= caretMargin;

if ((availableWidth - _codeColumnWidth).abs() > 0.5) {
_codeColumnWidth = max(0, availableWidth);
print('availableWidth: $availableWidth');
// Recalculate the line numbers because wrapping may have
// changed due to a width change.
WidgetsBinding.instance.addPostFrameCallback((_) {
if (mounted) {
_onTextChanged();
}
});
}
return codeCol;
},
),
),
],
),
);
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