MouseCursor class Null safety
An interface for mouse cursor definitions.
A mouse cursor is a graphical image on the screen that echoes the movement of a pointing device, such as a mouse or a stylus. A MouseCursor object defines a kind of mouse cursor, such as an arrow, a pointing hand, or an I-beam.
During the painting phase, MouseCursor objects are assigned to regions on the screen via annotations. Later during a device update (e.g. when a mouse moves), MouseTracker finds the active cursor of each mouse device, which is the front-most region associated with the position of each mouse cursor, or defaults to SystemMouseCursors.basic if no cursors are associated with the position. MouseTracker changes the cursor of the pointer if the new active cursor is different from the previous active cursor, whose effect is defined by the session created by createSession.
Cursor classes
A SystemMouseCursor is a cursor that is natively supported by the platform that the program is running on. All supported system mouse cursors are enumerated in SystemMouseCursors.
Using cursors
A MouseCursor object is used by being assigned to a MouseRegion or another widget that exposes the MouseRegion API, such as InkResponse.mouseCursor.
flutter create --sample=services.MouseCursor.1 mysample
Assigning regions with mouse cursors on platforms that do not support mouse cursors, or when there are no mice connected, will have no effect.
Related classes
MouseCursorSession represents the duration when a pointing device displays a cursor, and defines the states and behaviors of the cursor. Every mouse cursor class usually has a corresponding MouseCursorSession class.
MouseCursorManager is a class that adds the feature of changing cursors to MouseTracker, which tracks the relationship between mouse devices and annotations. MouseCursorManager is usually used as a part of MouseTracker.
- Mixed in types
- Implementers
- Annotations
Constructors
- MouseCursor()
-
Abstract const constructor. This constructor enables subclasses to provide
const constructors so that they can be used in const expressions.
const
Properties
- debugDescription → String
-
A very short description of the mouse cursor.
read-only
- hashCode → int
-
The hash code for this object.
read-onlyinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
read-onlyinherited
Methods
-
createSession(
int device) → MouseCursorSession - Associate a pointing device to this cursor.
-
debugFillProperties(
DiagnosticPropertiesBuilder properties) → void - Add additional properties associated with the node.
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a non-existent 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.
override
-
toStringShort(
) → String -
A brief description of this object, usually just the runtimeType and the
hashCode.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited
Constants
- defer → const MouseCursor
-
A special class that indicates that the region with this cursor defers the
choice of cursor to the next region behind it.
_DeferringMouseCursor._()
- uncontrolled → const MouseCursor
-
A special value that doesn't change cursor by itself, but make a region
that blocks other regions behind it from changing the cursor.
_NoopMouseCursor._()