MouseCursorSession class Null safety
Manages the duration that a pointing device should display a specific mouse cursor.
While MouseCursor classes describe the kind of cursors, MouseCursorSession classes represents a continuous use of the cursor on a pointing device. The MouseCursorSession classes can be stateful. For example, a cursor that needs to load resources might want to set a temporary cursor first, then switch to the correct cursor after the load is completed.
A MouseCursorSession has the following lifecycle:
- When a pointing device should start displaying a cursor, MouseTracker creates a session by calling MouseCursor.createSession on the target cursor, and stores it in a table associated with the device.
- MouseTracker then immediately calls the session's activate, where the session should fetch resources and make system calls.
- When the pointing device should start displaying a different cursor, MouseTracker calls dispose on this session. After dispose, this session will no longer be used in the future.
Constructors
- MouseCursorSession(MouseCursor cursor, int device)
- Create a session.
Properties
- cursor → MouseCursor
-
The cursor that created this session.
final
- device → int
-
The device ID of the pointing device.
final
- hashCode → int
-
The hash code for this object.
read-onlyinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
read-onlyinherited
Methods
-
activate(
) → Future< void> -
Override this method to do the work of changing the cursor of the device.
protected">@protected
-
dispose(
) → void -
Called when device stops displaying the cursor.
protected">@protected
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a non-existent method or property is accessed.
inherited
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited