RenderObject class abstract
Base class for objects in the render tree.
RenderObjects know how to layout themselves and record paint commands.
- Implementers
Constructors
Properties
-
children
→ List<
RenderObject> -
Live read-only view of direct children in traversal order.
latefinal
- debugNeedsLayout → bool
-
Whether this render object is waiting for layout.
no setter
- debugNeedsPaint → bool
-
Whether this render object is waiting for paint.
no setter
- hashCode → int
-
The hash code for this object.
no setterinherited
- height ↔ int
-
Height in terminal cells, assigned during layout.
getter/setter pair
- parent → RenderObject?
-
Parent RenderObject in the tree.
no setter
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- width ↔ int
-
Width in terminal cells, assigned during layout.
getter/setter pair
- x ↔ int
-
Horizontal position in terminal cells, relative to the parent.
getter/setter pair
- y ↔ int
-
Vertical position in terminal cells, relative to the parent.
getter/setter pair
Methods
-
adoptChild(
RenderObject child) → void - Add a child to this render object
-
detach(
) → void - Called when the render object is detached from the render tree.
-
dropChild(
RenderObject child) → void - Remove a child from this render object
-
hitTest(
HitTestResult result, Offset position) → bool -
Hit-test this render object using
positionin local coordinates. -
layout(
Constraints constraints) → void - Entry point for layout.
-
markNeedsLayout(
) → void - Mark this render object as needing layout and paint.
-
markNeedsPaint(
) → void - Mark this render object as needing paint.
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
paint(
PaintingContext context, Offset offset) → void -
Paint protocol: record drawing commands at
offset. -
performLayout(
Constraints constraints) → void - Layout protocol: given constraints, compute size and position.
-
toString(
) → String -
A string representation of this object.
inherited
-
visitChildren(
void visitor(RenderObject child)) → void - Visit all children with a callback
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited