Here’s another fun one:
Let’s say you have a class
public class Foo{
public function Foo(){
}
public function doSomethingIntense(intensity:Number):void{
}
public function somthingElse():void{
if(fooBaz){
doSomethingIntense();
} else if(fooBar){
doSomeOtherThing();
doSomethingIntense();
}
}
}
Now, you really should pull doSomethingIntense() out into a
requestAnimationFrame. But every time you invoke doSomethingIntense() having to
wrap it in requestAnimationFrame with a function is annoying and error prone.
With delayFunction you can do the following:
public function Foo(){
delayedIntenseThing = delayFunction(doSomethingIntense);
}
private var delayedIntenseThing:Function
And then you can just call delayedIntenseThing() the same way you’d call
doSomethingIntense().
It’s at times like this that I really wish ActionScript had typed functions
with signatures...
Harbs
> On Jan 6, 2022, at 1:28 AM, ha...@apache.org wrote:
>
> This is an automated email from the ASF dual-hosted git repository.
>
> harbs pushed a commit to branch develop
> in repository https://gitbox.apache.org/repos/asf/royale-asjs.git
>
>
> The following commit(s) were added to refs/heads/develop by this push:
> new 63bad6b Another fun function
> 63bad6b is described below
>
> commit 63bad6b4ab5e4af2953fedc34fa01a301c50052e
> Author: Harbs <ha...@in-tools.com>
> AuthorDate: Thu Jan 6 01:28:22 2022 +0200
>
> Another fun function
> ---
> .../projects/Core/src/main/royale/CoreClasses.as | 1 +
> .../royale/utils/functional/delayFunction.as | 69 ++++++++++++++++++++++
> .../test/royale/flexUnitTests/FunctionalTests.as | 34 +++++++++++
> 3 files changed, 104 insertions(+)
>
> diff --git a/frameworks/projects/Core/src/main/royale/CoreClasses.as
> b/frameworks/projects/Core/src/main/royale/CoreClasses.as
> index 48189b5..e3da6a1 100644
> --- a/frameworks/projects/Core/src/main/royale/CoreClasses.as
> +++ b/frameworks/projects/Core/src/main/royale/CoreClasses.as
> @@ -383,6 +383,7 @@ internal class CoreClasses
> import org.apache.royale.utils.functional.debounceShort; debounceShort;
> import org.apache.royale.utils.functional.throttle; throttle;
> import org.apache.royale.utils.functional.animateFunction;
> animateFunction;
> + import org.apache.royale.utils.functional.delayFunction; delayFunction;
>
> import org.apache.royale.core.TextLineMetrics; TextLineMetrics;
> import org.apache.royale.utils.ClassSelectorList; ClassSelectorList;
> diff --git
> a/frameworks/projects/Core/src/main/royale/org/apache/royale/utils/functional/delayFunction.as
>
> b/frameworks/projects/Core/src/main/royale/org/apache/royale/utils/functional/delayFunction.as
> new file mode 100644
> index 0000000..44367f1
> --- /dev/null
> +++
> b/frameworks/projects/Core/src/main/royale/org/apache/royale/utils/functional/delayFunction.as
> @@ -0,0 +1,69 @@
> +////////////////////////////////////////////////////////////////////////////////
> +//
> +// Licensed to the Apache Software Foundation (ASF) under one or more
> +// contributor license agreements. See the NOTICE file distributed with
> +// this work for additional information regarding copyright ownership.
> +// The ASF licenses this file to You under the Apache License, Version 2.0
> +// (the "License"); you may not use this file except in compliance with
> +// the License. You may obtain a copy of the License at
> +//
> +// http://www.apache.org/licenses/LICENSE-2.0
> +//
> +// Unless required by applicable law or agreed to in writing, software
> +// distributed under the License is distributed on an "AS IS" BASIS,
> +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
> +// See the License for the specific language governing permissions and
> +// limitations under the License.
> +//
> +////////////////////////////////////////////////////////////////////////////////
> +package org.apache.royale.utils.functional
> +{
> + COMPILE::SWF{
> + import flash.utils.setTimeout;
> + import flash.utils.clearTimeout;
> + }
> + /**
> + * Returns a function which when run will invoke the wrapped function
> after a delay.
> + * Defaults to 0 which will execute at the next opportune time.
> + * In JS this uses requestAnimationFrame
> + *
> + * @royalesuppressexport
> + * @langversion 3.0
> + * @productversion Royale 0.9.9
> + *
> + */
> + public function delayFunction(method:Function, delay:Number=0):Function
> + {
> + return function(...args):void
> + {
> +
> + function callback():void
> + {
> + method.apply(null,args);
> + }
> +
> + COMPILE::SWF
> + {
> + setTimeout(function():void{
> + callback();
> + },delay);
> + }
> +
> + COMPILE::JS
> + {
> + if(delay)
> + {
> + setTimeout(function():void{
> + requestAnimationFrame(callback);
> + },delay);
> + }
> + else
> + {
> + requestAnimationFrame(callback);
> + }
> +
> + }
> +
> + }
> + }
> +}
> \ No newline at end of file
> diff --git
> a/frameworks/projects/Core/src/test/royale/flexUnitTests/FunctionalTests.as
> b/frameworks/projects/Core/src/test/royale/flexUnitTests/FunctionalTests.as
> index 75f320c..f17c1a7 100644
> ---
> a/frameworks/projects/Core/src/test/royale/flexUnitTests/FunctionalTests.as
> +++
> b/frameworks/projects/Core/src/test/royale/flexUnitTests/FunctionalTests.as
> @@ -27,6 +27,7 @@ package flexUnitTests
> import org.apache.royale.utils.functional.*;
> import org.apache.royale.utils.functional.animateFunction;
> import org.apache.royale.test.asserts.assertTrue;
> + import org.apache.royale.test.asserts.assertEquals;
>
> public class FunctionalTests
> {
> @@ -226,6 +227,39 @@ package flexUnitTests
> assertTrue(savedValue<3,"value should be 2");
> }, 300);
> }
> + public function testDelay():void
> + {
> + var foo:Foo = new Foo();
> + var delayedThis:Function = delayFunction(foo.increment,20);
> +
> + delayedThis(1);
> +
> + var firstThisValue:Number = foo.value;
> +
> + var savedThisValue:Number;
> + setTimeout(function():void{
> + savedThisValue = foo.value;
> + },75);
> +
> + var value:Number = 0;
> + function increment(val:Number):void{
> + value+=val;
> + }
> + var delayed:Function = delayFunction(increment,20);
> + delayed(1);
> + var firstValue:Number = value;
> + var savedValue:Number;
> + setTimeout(function():void{
> + savedValue = value;
> + },75);
> + Async.delayCall(this, function():void
> + {
> + assertEquals(firstThisValue,0,"foo value should be 0")
> + assertEquals(savedThisValue,1,"foo value should be 1")
> + assertEquals(firstValue,0,"value should be 0")
> + assertEquals(savedValue,1,"value should be 1")
> + }, 200);
> + }
>
>
> }
