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Description:

stack board

Stack Board #
A Flutter package of custom stack board.

Try it: Demo

1.使用 StackBoardController #

import 'package:stack_board/stack_board.dart';

StackBoard(
controller: _boardController,
///添加背景
background: const ColoredBox(color: Colors.grey),
),
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添加自适应文本 #

_boardController.add(
const AdaptiveText(
'Flutter Candies',
tapToEdit: true,
style: TextStyle(fontWeight: FontWeight.bold),
),
);
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添加自适应图片 #

_boardController.add(
StackBoardItem(
child: Image.network('https://avatars.githubusercontent.com/u/47586449?s=200&v=4'),
),
);
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添加画板 #

_boardController.add(
const StackDrawing(
caseStyle: CaseStyle(
borderColor: Colors.grey,
iconColor: Colors.white,
boxAspectRatio: 1,
),
),
);
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添加自定义item #

1.继承自 StackItemContent 和 StackItem

class ColorContent extends StackItemContent {
ColorContent({required this.color});

Color color;

@override
Map<String, dynamic> toJson() {
return <String, dynamic>{
'color': color.value,
};
}
}

class ColorStackItem extends StackItem<ColorContent> {
ColorStackItem({
required Size size,
String? id,
Offset? offset,
double? angle,
StackItemStatus? status,
ColorContent? content,
}) : super(
id: id,
size: size,
offset: offset,
angle: angle,
status: status,
content: content,
);

@override
ColorStackItem copyWith({
Size? size,
Offset? offset,
double? angle,
StackItemStatus? status,
ColorContent? content,
}) {
return ColorStackItem(
id: id, // <= must !!
size: size ?? this.size,
offset: offset ?? this.offset,
angle: angle ?? this.angle,
status: status ?? this.status,
content: content ?? this.content,
);
}
}
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2.使用controller添加

import 'dart:math' as math;

...

/// Add custom item
void _addCustomItem() {
final Color color = Colors.primaries[Random().nextInt(Colors.primaries.length)];
_boardController.addItem(
ColorStackItem(
size: const Size.square(100),
content: ColorContent(color: color),
),
);
}
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3.使用customBuilder构建

StackBoard(
controller: _boardController,
/// 如果使用了继承于StackBoardItem的自定义item
/// 使用这个接口进行重构
customBuilder: (StackItem<StackItemContent> item) {
if (...) {

...

} else if (item is ColorStackItem) {
return Container(
width: item.size.width,
height: item.size.height,
color: item.content?.color,
);
}

...
},
)
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