87 lines
2.4 KiB
Dart
87 lines
2.4 KiB
Dart
import 'package:flutter/material.dart';
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enum BubbleNip { leftTop, rightBottom, none }
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class BubbleEdges {
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const BubbleEdges.only({this.top = 0, this.bottom = 0, this.left = 0, this.right = 0});
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const BubbleEdges.all(double value)
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: top = value,
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bottom = value,
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left = value,
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right = value;
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final double top;
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final double bottom;
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final double left;
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final double right;
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EdgeInsets toEdgeInsets() => EdgeInsets.fromLTRB(left, top, right, bottom);
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}
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class BubbleStyle {
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const BubbleStyle({
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this.color,
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this.borderWidth = 0,
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this.elevation = 0,
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this.margin = const BubbleEdges.only(),
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this.padding = const BubbleEdges.all(8),
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this.alignment = Alignment.centerLeft,
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this.nip = BubbleNip.none,
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this.borderRadius = 12,
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});
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final Color? color;
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final double borderWidth;
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final double elevation;
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final BubbleEdges margin;
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final BubbleEdges padding;
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final Alignment alignment;
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final BubbleNip nip;
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final double borderRadius;
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}
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/// The "nip" is faked by flattening one corner so the bubble anchors to
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/// the speaker side.
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class Bubble extends StatelessWidget {
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const Bubble({required this.child, required this.style, super.key});
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final Widget child;
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final BubbleStyle style;
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BorderRadius _radius() {
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final r = Radius.circular(style.borderRadius);
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final flat = Radius.zero;
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switch (style.nip) {
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case BubbleNip.leftTop:
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return BorderRadius.only(topLeft: flat, topRight: r, bottomLeft: r, bottomRight: r);
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case BubbleNip.rightBottom:
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return BorderRadius.only(topLeft: r, topRight: r, bottomLeft: r, bottomRight: flat);
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case BubbleNip.none:
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return BorderRadius.all(r);
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}
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}
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@override
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Widget build(BuildContext context) {
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final radius = _radius();
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return Align(
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alignment: style.alignment,
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child: Container(
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margin: style.margin.toEdgeInsets(),
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decoration: BoxDecoration(
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color: style.color,
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borderRadius: radius,
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border: style.borderWidth > 0
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? Border.all(color: Theme.of(context).dividerColor, width: style.borderWidth)
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: null,
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boxShadow: style.elevation > 0
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? [BoxShadow(color: Colors.black26, blurRadius: style.elevation * 2, offset: Offset(0, style.elevation))]
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: null,
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),
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padding: style.padding.toEdgeInsets(),
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child: child,
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),
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);
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}
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}
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