In Polymer1 I used
on-tap="exportAsCsv"
in my template! When I use this in a Polymer2 Component (ES6 class syntax) it does not work (Event is not called).
Are you extending Polymer.GestureEventListeners.
You need to extend them in order to use gesture event
class TestEvent extends Polymer.GestureEventListeners(Polymer.Element) {
Please have a look at documents for more help.
Related
Some method creates new instance of my custom element (created with polymer) and attaches it on page. But I want to check is Element registered before add it and print error to console in bad case. I mean what if I forgot import component html declaration:
<!--I forgot write it in my HTML file -->
<!--<link rel="import" href="packages/visualytik/vis_starter.html">-->
So, in case when I forgot import I want to print error in console.
I know one tricky method:
import 'my_custom_component.dart';
Element component = new Element.tag('my-custom-component');
bool registered = component is MyCustomComponent;
But it's hard method because we should create component first and have to import MyCustomComponent.dart in dart file. Can I check it in other way? Something like:
document.isRegistered('my-custom-component');
Update3
You can also use the new #HtmlImport annotation. If you import the class, then you can be sure you also have imported the HTML of the element. See also https://stackoverflow.com/a/29710355/217408
Update2
See Hunting down unregistered elements
Update
Use a custom constructor in your elements class and do the registration there but only if it wasn't done already.
class MyCustomComponent extends ... {
bool _isRegistered;
bool get isRegistered => _isRegistered;
factory MyCustomComponent() {
if(!isRegistered) {
registerElement();
_isRegistered = true;
}
return new Element.tag('my-custom-element');
}
}
and then create new instances like
new MyCustomElement();
and you can always be sure the element is registered only once (but you always need to use this constructor of course).
Original
If you register your elements by calling document.RegisterElement() yourself instead of relying on Polymer for example, you need to hold a reference to the constructor reference document.RegisterElement() returns, otherwise you won't be able to create an instance of the element.
Therefore you just need to check if you already have a reference to the constructor. See also https://developer.mozilla.org/en-US/docs/Web/API/Document/registerElement
I'm making a level editor for my game, and would like to be able to access a list of all the classes included in my game. I have a static function in my Main class:
public static function register(c:Class, category:String):void {
if (classRegister[category] == null) {
classRegister[category] = new Array();
}
classRegister[category].push(c);
}
Then, in each class I want registered, I put a static initializer:
{
Main.register(prototype.constructor, "motion");
}
However, the static initializers only get called when the class first gets used. Is there a way for a class to force itself to be used right when the game starts? I'm aware that I could explicitly list all the registered classes in the Main file, but that's suboptimal in that the Main file would have to be edited whenever a new class is added that wants registration.
Thanks,
Varga
List all the class definition in the ApplicationDomain, and filter them based on a naming convention or a type (an interface?).
To achieve this, you can use ApplicationDomain.getQualifiedDefinitionNames() (docs), but only if you target FlashPlayer 11.3+.
As a side note, you MUST reference this class somewhere, as a class field so the compiler knows it must include this class in the SWF. You can also put the classes you want to reference inside a SWC library and use -compiler.include-libraries as compiler setting (in that case I wonder if your static initializers gets called?).
I always created additional property to MovieCLips using the syntax
myMC.myProperty
without any sort of declaration... But i can use this method only with MovieClips.. What about if i want to add a property to a button or any different type of object? I need to extend the class? Do you can me suggest how? Many thanks
You can add property to movieclips in runtime because MovieClip is dynamic class. If the class is not dynamic, you should extend it to create methods and properties.
Read about dynamic classes.
I tend to create custom classes for nearly everything.
I would extend the relevant class and set up a private var for your new property. You can then pass in the value to the constructor or add a getter/setter method to call externally.
private function _myProperty:int;
public function get myProperty():int
{
return _myProperty;
}
public function set myProperty(newVal:int):void
{
_myProperty = newVal;
}
Getter/setter methods add a few lines of code that may seem unnecessary but on big projects when you find a property is being set and you don't know why, you can put a break point in your set myProperty
Subclass is main solution.
Next works only with mx components (flex sdk 3).
Most components have data : Object property that you can freely use to store data.
Monkey patching sometimes is the only way to go. It allows you to add custom properties to flex sdk classes. I don't think you should use it in your case. But I used it to change core logic that is locked by private keyword in flex sdk.
Hope that helps.
Can anyone please help me solve this mystery:
I've got a component called Box.as that has following two properties, and have their getters & setters defined:
private var _busy:Boolean;
private var _errorMessage:String;
In MXML that uses this component I define it like this:
<components:Box skinClass="skins.components.BoxSkin"
busy="{presenter.boxBusy}"
errorMessage="{presenter.boxErrorMessage}"/>
Where presenter variable is defined here in MXML and a Presenter class has boxBusy and boxErrorMessage variables defined as bindable property change events:
[Bindable(event="propertyChange")]
function get boxBusy():Boolean;
function set boxBusy(value:Boolean):void;
[Bindable(event="propertyChange")]
function get boxErrorMessage():String;
function set boxErrorMessage(value:String):void;
PROBLEM is that whenever I change boxErrorMessage for the presenter, I see the affect in MXML but nothing happens at all when I change boxBusy. Is there something extra I need to do with boolean variable?
Thanks a lot in advance.
You should omit the (event="propertyChange") specification from your [Bindable] metadata tags on both boxBusy and boxErrorMessage. Also, make sure your get/set methods are declared public.
So, the property, boxBusy, would look something like this:
[Bindable]
public function get boxBusy():Boolean { return _busy; }
public function set boxBusy(value:Boolean):void { _busy = value; }
When you qualify [Bindable] with (event="..."), you're telling Flex, "I will dispatch the named event whenever the binding should be updated".
If you omit the event specification, then flex assumes that the event is named propertyChange. But that's not all it does. It also automatically "wraps" your setter with generated code that transparently dispatches a 'propertyChange' event any time the setter is used to modify the value. This is described in more detail here, at adobe livedocs.
So... by explicitly specifying (event="propertyChange"), you disable flex's default behavior. Even though you're using the default event name, flex will not generate the wrapper code -- instead, it will expect you to dispatch the event from your code, at the appropriate time.
I imagine that your boxErrorMessage property appears to be working, because some other [Bindable] property of your class is changing in the same pass -- thus dispatching propertyChange, and causing your boxErrorMessage binding to update as a side-effect.
It is completely possible that if you are setting busyBox to true the first time the setter is getting called but it will not get called again if you again try to set to true. The code that is by the flex compiler when you use the [Bindable] tag will adds a check to see if you are setting the new value to what the getter will currently will return. If that is the cause it isn't called.
If you were to oscillate between true and false it would get called every time because the new value differs from the current value. But setting it to true-true-true-true-false would only result in it getting called the first time to set to your and the last time to set to false.
When I add an actionperformed event to a button, it generates the TODO section.
However, I would like for it to call a public method defined in MyApp.java, instead of having to define the method inside the MyAppView.java
How can I do this ? Tell MyAppView.java to get the methods and classes from MyApp.java ?
If I understand you correcty:
MyApp.java should implement ActionListener interface, then when creating button. Add object of the class MyApp to listen for actions on this button.
button.addActionListener(myApp);