ImgElement class
Extends
DisposableImpl > AttachableObject > PElement > ImgElement
Subclasses
Constructors
new ImgElement(num width, num height, ImageElement _image, [bool cacheEnabled = false]) #
ImgElement(num width, num height, this._image, [bool cacheEnabled = false]) : super(width, height, cacheEnabled);
factory ImgElement.fromUrl(String src, num w, num h) #
factory ImgElement.fromUrl(String src, num w, num h) { final img = new ImageElement(src, null, null); return new ImgElement(w, h, img); }
Fields
Methods
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);
AffineTransform addTransform() #
AffineTransform addTransform(){ validateNotDisposed(); var tx = new AffineTransform(); _transforms.add(tx); return tx; }
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(); _updatedEventHandle.dispose(); _invalidatedEventHandle.dispose(); }
bool draw(CanvasRenderingContext2D ctx) #
bool draw(CanvasRenderingContext2D ctx){ update(); var dirty = (_lastDrawSize == null); drawCore(ctx); return dirty; }
void drawCore(CanvasRenderingContext2D ctx) #
void drawCore(CanvasRenderingContext2D ctx){ if(cacheEnabled) { _drawCached(ctx); } else { _drawNormal(ctx); } }
void drawOverride(CanvasRenderingContext2D ctx) #
void drawOverride(CanvasRenderingContext2D ctx) { if(_image.complete) { _doDraw(ctx); } else if(!_waitingOnLoad) { _waitingOnLoad = true; // TODO: some day we'll have a way to remove these cleanly // ...because this handled should be disposed :-/ _image.on.load.add(_onImageLoad); } }
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; }
PElement getVisualChild(int index) #
PElement getVisualChild(int index){ throw "no children for this type"; }
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 set height(num value) #
void set height(num value) { assert(isValidNumber(value)); _height = value; invalidateDraw(); }
EventRoot<EventArgs> get invalidated() #
EventRoot<EventArgs> get invalidated => _invalidatedEventHandle;
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);
void registerParent(ElementParent parent) #
void registerParent(ElementParent parent) { assert(_parent == null); assert(parent != null); _parent = parent; }
Type get runtimeType() #
A representation of the runtime type of the object.
external Type get runtimeType;
void set size(Size value) #
void set size(Size value) { assert(value.isValid); _width = value.width; _height = value.height; invalidateDraw(); }
String toString() #
Returns a string representation of this object.
external String toString();
void update() #
void update(){ _updatedEventHandle.fireEvent(EventArgs.empty); }
EventRoot<EventArgs> get updated() #
EventRoot<EventArgs> get updated => _updatedEventHandle;
void validateNotDisposed() #
void validateNotDisposed() { assert(!_disposed); }