ParentElement abstract class
abstract class ParentElement extends PElement implements ElementParent { ParentElement(num w, num h, [bool enableCache = false]) : super(w, h, enableCache); bool hasVisualChild(PElement element){ var length = visualChildCount; for(var i=0;i<length;i++){ if(identical(element, getVisualChild(i))){ return true; } } return false; } void onChildrenChanged(){ invalidateDraw(); } abstract PElement getVisualChild(index); abstract int get visualChildCount; void childInvalidated(PElement child){ assert(hasVisualChild(child)); invalidateDraw(); } void update(){ _forEach((e) => e.update()); super.update(); } void drawOverride(CanvasRenderingContext2D ctx) { _forEach((e) => e.drawCore(ctx)); } void _forEach(Action1<PElement> f) { final length = visualChildCount; for(int i = 0; i < length; i++) { f(getVisualChild(i)); } } }
Extends
DisposableImpl > AttachableObject > PElement > ParentElement
Subclasses
Implements
Constructors
new ParentElement(num w, num h, [bool enableCache = false]) #
ParentElement(num w, num h, [bool enableCache = false]) : super(w, h, enableCache);
Properties
num height #
num get height => _height;
void set height(num value) { assert(isValidNumber(value)); _height = value; invalidateDraw(); }
final EventRoot<EventArgs> invalidated #
EventRoot<EventArgs> get invalidated => _invalidatedEventHandle;
final Type runtimeType #
A representation of the runtime type of the object.
external Type get runtimeType;
Size size #
Size get size => new Size(_width, _height);
void set size(Size value) { assert(value.isValid); _width = value.width; _height = value.height; invalidateDraw(); }
final int visualChildCount #
abstract int get visualChildCount;
Operators
bool operator ==(other) #
The equality operator.
The default behavior for all Object
s is to return true if and
only if this
and
other are the same object.
If a subclass overrides the equality operator it should override
the hashCode
method as well to maintain consistency.
bool operator ==(other) => identical(this, other);
Methods
AffineTransform addTransform() #
AffineTransform addTransform(){ validateNotDisposed(); var tx = new AffineTransform(); _transforms.add(tx); return tx; }
void childInvalidated(PElement child) #
void childInvalidated(PElement child){ assert(hasVisualChild(child)); invalidateDraw(); }
void dispose() #
void dispose(){ if (!_disposed) { // Set disposed_ to true first, in case during the chain of disposal this // gets disposed recursively. this._disposed = true; this.disposeInternal(); } }
void disposeInternal() #
Do not call this method directly. Call dispose
instead.
Subclasses should override this method to implement Disposable
behavior.
void disposeInternal(){ super.disposeInternal(); _invalidatedEventHandle.dispose(); }
void drawCore(CanvasRenderingContext2D ctx) #
void drawCore(CanvasRenderingContext2D ctx){ if(cacheEnabled) { _drawCached(ctx); } else { _drawNormal(ctx); } }
void drawOverride(CanvasRenderingContext2D ctx) #
void drawOverride(CanvasRenderingContext2D ctx) { _forEach((e) => e.drawCore(ctx)); }
AffineTransform getTransform() #
AffineTransform getTransform() { var tx = new AffineTransform(); _transforms.forEach(tx.concatenate); return tx; }
AffineTransform getTransformToRoot() #
AffineTransform getTransformToRoot(){ var tx = new AffineTransform(); if(_parent != null){ tx.concatenate(_parent.getTransformToRoot()); } tx.concatenate(getTransform()); return tx; }
int hashCode() #
Get a hash code for this object.
All objects have hash codes. Hash codes are guaranteed to be the
same for objects that are equal when compared using the equality
operator ==
. Other than that there are no guarantees about
the hash codes. They will not be consistent between runs and
there are no distribution guarantees.
If a subclass overrides hashCode
it should override the
equality operator as well to maintain consistency.
external int hashCode();
bool hasVisualChild(PElement element) #
bool hasVisualChild(PElement element){ var length = visualChildCount; for(var i=0;i<length;i++){ if(identical(element, getVisualChild(i))){ return true; } } return false; }
void invalidateDraw() #
void invalidateDraw(){ validateNotDisposed(); if(_lastDrawSize != null){ _lastDrawSize = null; _invalidateParent(); } }
noSuchMethod(String name, List args) #
noSuchMethod
is invoked when users invoke a non-existant method
on an object. The name of the method and the arguments of the
invocation are passed to noSuchMethod
. If noSuchMethod
returns a value, that value becomes the result of the original
invocation.
The default behavior of noSuchMethod
is to throw a
noSuchMethodError
.
external Dynamic noSuchMethod(String name, List args);
const Object() #
Creates a new Object
instance.
Object
instances have no meaningful state, and are only useful
through their identity. An Object
instance is equal to itself
only.
const Object();
void onChildrenChanged() #
void onChildrenChanged(){ invalidateDraw(); }
new ParentElement(num w, num h, [bool enableCache = false]) #
ParentElement(num w, num h, [bool enableCache = false]) : super(w, h, enableCache);
new PElement(num _width, num _height, [bool cacheEnabled = false]) #
PElement(this._width, this._height, [this.cacheEnabled = false]);
void registerParent(ElementParent parent) #
void registerParent(ElementParent parent) { assert(_parent == null); assert(parent != null); _parent = parent; }
String toString() #
Returns a string representation of this object.
external String toString();
void update() #
void update(){ _forEach((e) => e.update()); super.update(); }
void validateNotDisposed() #
void validateNotDisposed() { assert(!_disposed); }