Eraser class
橡皮擦绘制内容
使用BlendMode.clear混合模式实现擦除效果 擦除路径会叠加在底层内容上，产生透明擦除效果
Eraser Drawing Content
Uses BlendMode.clear blend mode to achieve erasing effect Eraser path is overlaid on the base content to produce transparent erasing effect
- Inheritance
-
- Object
- PaintContent
- Eraser
Constructors
- Eraser()
- Eraser.data({required DrawPath drawPath, required Paint paint})
-
Eraser.fromJson(Map<
String, dynamic> data) -
factory
Properties
- contentType → String
-
内容类型标识（用于JSON序列化）
no setteroverride
- drawPath ↔ DrawPath
-
擦除路径
getter/setter pair
- hashCode → int
-
The hash code for this object.
no setterinherited
- paint ↔ Paint
-
画笔配置
getter/setter pairinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
copy(
) → Eraser -
复制实例，避免对象引用传递
override
-
draw(
Canvas canvas, Size size, bool deeper) → void -
绘制核心方法
canvas画布对象size画布尺寸deeper当前是否为底层绘制（true为历史记录层，false为实时绘制层）override -
drawing(
Offset nowPoint) → void -
绘制过程中调用（手指移动时）
override
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
startDraw(
Offset startPoint) → void -
开始绘制（手指按下时）
override
-
toContentJson(
) → Map< String, dynamic> -
转换为JSON内容（子类实现）
override
-
toJson(
) → Map< String, dynamic> -
转换为JSON对象
inherited
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited