Brush class abstract
Base class for brush behavior.
A brush allows the user to select a region of a chart by clicking and dragging. This is commonly used for zooming, filtering, or highlighting data.
- Inheritance
- Implementers
Constructors
- Brush({Key? key, required Widget child, void onBrushStart(BrushExtent extent)?, void onBrush(BrushExtent extent)?, void onBrushEnd(BrushExtent extent)?, void onBrushClear()?, BrushExtent? initialExtent, Color overlayColor = const Color(0x20000000), Color borderColor = const Color(0x80000000), double borderWidth = 1.0, double minSelectionSize = 5.0, bool movable = true, bool resizable = true, double handleSize = 10.0, bool clearOnDoubleTap = true})
-
Creates a Brush widget.
const
Properties
- borderColor → Color
-
The color of the brush selection border.
final
- borderWidth → double
-
The width of the brush selection border.
final
- child → Widget
-
The child widget to render inside the brush area.
final
- clearOnDoubleTap → bool
-
Whether to clear the selection on double-tap.
final
- handleSize → double
-
The size of the resize handles.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- initialExtent → BrushExtent?
-
The initial extent of the brush.
final
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- minSelectionSize → double
-
The minimum size of a brush selection.
final
- movable → bool
-
Whether the brush selection can be moved.
final
- onBrush → void Function(BrushExtent extent)?
-
Called when the brush selection changes.
final
- onBrushClear → void Function()?
-
Called when the brush is cleared.
final
- onBrushEnd → void Function(BrushExtent extent)?
-
Called when a brush selection is ended.
final
- onBrushStart → void Function(BrushExtent extent)?
-
Called when a brush selection is started.
final
- overlayColor → Color
-
The color of the brush selection overlay.
final
- resizable → bool
-
Whether the brush selection can be resized.
final
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
createElement(
) → StatefulElement -
Creates a StatefulElement to manage this widget's location in the tree.
inherited
-
createState(
) → State< StatefulWidget> -
Creates the mutable state for this widget at a given location in the tree.
inherited
-
debugDescribeChildren(
) → List< DiagnosticsNode> -
Returns a list of DiagnosticsNode objects describing this node's
children.
inherited
-
debugFillProperties(
DiagnosticPropertiesBuilder properties) → void -
Add additional properties associated with the node.
inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
toDiagnosticsNode(
{String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode -
Returns a debug representation of the object that is used by debugging
tools and by DiagnosticsNode.toStringDeep.
inherited
-
toString(
{DiagnosticLevel minLevel = DiagnosticLevel.info}) → String -
A string representation of this object.
inherited
-
toStringDeep(
{String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug, int wrapWidth = 65}) → String -
Returns a string representation of this node and its descendants.
inherited
-
toStringShallow(
{String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String -
Returns a one-line detailed description of the object.
inherited
-
toStringShort(
) → String -
A short, textual description of this widget.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited