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feat: add crop function for MFM #637

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Merged
merged 1 commit into from
May 25, 2025
Merged

feat: add crop function for MFM #637

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18 changes: 18 additions & 0 deletions lib/view/widget/mfm.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,7 @@ import 'mfm/blur.dart';
import 'mfm/border.dart';
import 'mfm/bounce.dart';
import 'mfm/code.dart';
import 'mfm/crop.dart';
import 'mfm/jelly.dart';
import 'mfm/jump.dart';
import 'mfm/rainbow.dart';
Expand Down Expand Up @@ -1167,6 +1168,23 @@ class _Mfm extends StatelessWidget {
),
),
);
case 'crop':
return WidgetSpan(
alignment: children.any(_containsNewLine)
? PlaceholderAlignment.bottom
: PlaceholderAlignment.baseline,
baseline: TextBaseline.alphabetic,
child: Crop(
args: args,
child: Text.rich(
TextSpan(children: _buildNodes(context, config, children)),
textAlign: config.align,
overflow: overflow,
textScaler: TextScaler.noScaling,
maxLines: maxLines,
),
),
);
default:
return TextSpan(
children: [
Expand Down
62 changes: 62 additions & 0 deletions lib/view/widget/mfm/crop.dart
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Original file line number Diff line number Diff line change
@@ -0,0 +1,62 @@
import 'dart:math';

import 'package:flutter/material.dart';

import '../../../util/safe_parse_double.dart';

class Crop extends StatelessWidget {
const Crop({super.key, required this.args, required this.child});

final Map<String, dynamic> args;
final Widget child;

@override
Widget build(BuildContext context) {
final top = safeParseDouble(args['top']) ?? 0.0;
final right = safeParseDouble(args['right']) ?? 0.0;
final bottom = safeParseDouble(args['bottom']) ?? 0.0;
final left = safeParseDouble(args['left']) ?? 0.0;

return ClipRect(
clipper: _InsetClipper(
left: left * 0.01,
top: top * 0.01,
right: right * 0.01,
bottom: bottom * 0.01,
),
child: child,
);
}
}

class _InsetClipper extends CustomClipper<Rect> {
const _InsetClipper({
required this.left,
required this.top,
required this.right,
required this.bottom,
});

final double left;
final double top;
final double right;
final double bottom;

@override
Rect getClip(Size size) {
final left = size.width * this.left;
final top = size.height * this.top;
final right = size.width * (1 - this.right);
final bottom = size.height * (1 - this.bottom);

return Rect.fromLTRB(left, top, max(left, right), max(top, bottom));
}

@override
bool shouldReclip(_InsetClipper oldClipper) {
return left != oldClipper.left ||
top != oldClipper.top ||
right != oldClipper.right ||
bottom != oldClipper.bottom;
}
}
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