I am working on an application which needs to load fonts dynamically based upon the fonts used in a given document that the user opens. The fonts are used in a RichEditableTextControl so need to be CFF format.
If I add the code:
[Embed(source="/assets/fonts/AvenirLTStd Book.otf",
fontFamily="EmbedAvenir LT Std 45 Book",
mimeType="application/x-font",
embedAsCFF="true")]
public const embeddedFont:Class;
to the main SWF then the text displays correctly with the embedded font but moving the code to a separate file and adding a loader as per the information I found at the following link does not load the font - http://www.scottgmorgan.com/blog/index.php/2007/06/18/runtime-font-embedding-in-as3-there-is-no-need-to-embed-the-entire-fontset-anymore/
The loader code is:
private function loadFont(url:String):void {
var loader:Loader = new Loader();
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, fontLoaded);
loader.load(new URLRequest(url));
}
private function fontLoaded(event:Event):void {
var FontLibrary:Class = event.target.applicationDomain.getDefinition("FontAvenirLTStd") as Class;
Font.registerFont(FontLibrary.embeddedFont);
}
There is an error thrown at the Font.registerFont line to say that the parameter being passed cannot be null. I have checked in debug mode and the issue seems to be that the class exists but does not have any content. The FontLibrary class is instantiated but the only child entry in the debugger is _prototype so trying to access the embeddedFont property does return undefined.
At the moment the font SWF is in the assets folder of the main project so I don't believe there should be any security restrictions and, as I said, the SWF loading part appears to work.
One thing which is hampering my diagnostics is that I am not sure if the problem is the font SWF not being created correctly and having no content or if the main app is unable to load it. Any help on at least being able to narrow that down would be appreciated.
I would appreciate all the help I can get on this as I have been stuck at this problem for some time and it is a key part of the application.
Thanks in advance to everyone.
Just a quick note for anyone who ends up here from Google, the problem was that I had managed to lose the static keyword from the embeddedFont constant definition in the top block. It should have been public static const embeddedFont:Class;
Hope this helps someone.
Related
I have a layout in my Xamarin Android project. I want to confirm that the resource is actually present in build.
I tried the following code:
var layout = Resources.GetLayout(Resource.Layout.my_xml_resource);
var xml = layout.ReadInnerXml();
System.Diagnostics.Debug.WriteLine(xml);
The GetLayout call does not throw the NotFoundException so presumably the resource exists. However, layout object, upon inspection, displays None.
The xml variable is empty and all attempts to read the xml are unsuccessful.
I am down this rabbit hole, because I am trying to use the layout with Inflate. Unfortunately, the output of inflate does not have the child controls I would expect and I suspect the resource layout is empty.
nativeView = inflater.Inflate(Resource.Layout.my_xml_resource, view, true);
What am I missing? Is there another way to verify the resource exists?
Use the Resources.GetIdentifier(String, String, String) Method could verify that Android Layout Resource Xml exists or not.
In C#, you could try the code below. If the resId not be 0, the resource exists.
int resId = Resources.GetIdentifier("textlayout", "layout", "com.companyname.app1");
textlayout: This is the layout name of my project, please note it need lower case.
layout: The type of resource you want to verify. It need lower case as well.
com.companyname.app1: PackageName, you could get from the AndroidManifest.xml file.
Here is my scenario: On my main view I am loading a list of items. Each item has an imageURL property. I am binding an Image component to the ImageURL property. Everything works well, but the image takes an extra second or two to load during which time the Image component is collapsed. Once the image is loaded, the Image component is displayed properly. This creates an undesirable shift on the page as the image is rendered.
The same images are going to be rendered on 2 other views.
What is the best practice to handle this scenario? I tried loading the base 64 string instead of the image url, which worked, but it slowed down the loading of the initial view significantly.
How can I pre-fetch the images and reuse them as I navigate between the views? I was looking at the image-cache module which seems to be addressing the exact scenario, but the documentation is very vague and the only example I found (https://github.com/telerik/nativescript-sample-cuteness/blob/master/nativescript-sample-cuteness/app/reddit-app-view-model.js) did not really address the same scenario. If I understood the code correctly, this is more about the virtual scrolling. In my case, I will have only 2-3 items, so the scrolling is not really a concern.
I would appreciate any advise.
Thank you.
Have you tried this?
https://github.com/VideoSpike/nativescript-web-image-cache
You will likely want to use a community plugin for this. You can also take a look at this:
https://docs.nativescript.org/cookbook/ui/image-cache
So after some research I came up with a solution that works for me. Here is what I did:
When the app start I created a global variable that contained a list of observable objects
then I made the http call to get all the objects and load them into the global variable
In the view I displayed the image as (the image is part of a Repeater item template):
<Image loaded="imageLoaded" />
in the js file I handled the imageLoaded events as:
var imageSource = require("image-source");
function imageLoaded(args) {
var img = args.object;
var bc = img.bindingContext;
if (bc.Loaded) {
img.imageSource = bc.ImageSource;
} else {
imageSource.fromUrl(bc.ImageURL).then(function (iSource) {
img.imageSource = iSource;
bc.set('ImageSource', iSource);
bc.set('Loaded', true);
});
}
}
So, after the initial load I am saving the imageSource as part of the global variable and on every other page I am getting it from there with the fallback of loading it from the URL is the image source is not available for this item.
I know this may raise some concerns about the amount of memory I am using to store the images, but since in my case, I am talking about no more than 2-3 images, I thought that this approach would not cause any memory issues.
I would love to hear any feedback on how to make this approach more efficient or if there is a better approach altogether.
You could use the nativescript-fresco plugin-in. It is an {N} plugin that is wrapping the popular Fresco library for managing images on Android. The plugin exposes functionality like: setting fade-in length, placehdler images, error images (when download is unsuccessful), corner rounding, dinamic sizing via aspect ration etc. for the full list of the advanced attributes you can refer this section of the readme. Also the plugin exposes some useful events that you can use to add custom logic when images are being retrieved from remote source.
In order to use the plugin simply initialize it in the onLaunch event of the application and call the .initialize() function:
var application = require("application");
var fresco = require("nativescript-fresco");
if (application.android) {
application.onLaunch = function (intent) {
fresco.initialize();
};
}
after that simply place the FrescoDrawee somewhere in your page and set its imageUri:
<Page
xmlns="http://www.nativescript.org/tns.xsd"
xmlns:nativescript-fresco="nativescript-fresco">
<nativescript-fresco:FrescoDrawee width="250" height="250"
imageUri="<uri-to-a-photo-from-the-web-or-a-local-resource>"/>
</Page>
I'm using a Magento 1.4.1.1 install that I'm having issues with the javascript on a custom themed store.
For example, going to any product page (e.g. http://www.papakuraeducation.co.nz/index.php/teachers/magic-caterpillar-handwriting-casey-caterpillar-small-book.html) loads a Javascript file, which contains code which is supposed to scale down the .jpg file to fit the 'product-image' container it sits inside.
The relevent code seems to be around line #10279, which is causing a exception that $(imageEl).parentNode = null
Product.Zoom.prototype = {
initialize: function(imageEl, trackEl, handleEl, zoomInEl, zoomOutEl, hintEl){
this.containerEl = $(imageEl).parentNode;
this.imageEl = $(imageEl);
this.handleEl = $(handleEl);
this.trackEl = $(trackEl);
this.hintEl = $(hintEl);
(snipped...)
I've tried debugging it in Chrome and adding breakpoints, but tbh I'm not actually sure how to use this information to find the solution.
Any help in pointing me in the right direction would be greatly appreciated.
You have to add an ID to the <IMG> in question. This ID should than be fed into the following code-space:
product_zoom = new Product.Zoom('IMAGE_ID', 'track', 'handle', 'zoom_in', 'zoom_out', 'track_hint');
I have a page with the following HTML content:
<img src="image.png" id="image">
and in my VB6 code I have a WebBrowser control which loads up that page, and now I want to fetch the src attribute of the image, and I tried this:
Dim image
image = WebBrowser1.Document.getElementById("image")
dim image_src as String
image_src = image.src
But I get the error Invalid qualifier. I debuged the image variable after the getElementById function call and I get: [object].
So, how can I get the src attribute of the image?
edit:
The thing that worked in the end was:
image = WebBrowser1.Document.getElementById("image").src
but to me, this doesn't make any sense, if this upper code works (just tested it), how come the one I tried first doesn't? I would kindly appreciate someone who can provide the explanation to this.
"You often need access to attributes, properties, and methods on the underlying element that are not directly exposed by HtmlElement, such as the SRC attribute on an IMG element or the Submit method on a FORM. The GetAttribute and SetAttribute methods enable you to retrieve and alter any attribute or property on a specific element, while InvokeMember provides access to any methods not exposed in the managed Document Object Model (DOM). If your application has unmanaged code permission, you can also access unexposed properties and methods with the DomElement attribute." -
http://msdn.microsoft.com/en-us/library/system.windows.forms.htmlelement.aspx
Think that suggests what the root issue is. Honestly not sure how assigning the return value changes the htmlElement object accessors. It seems like that is what is happening though. Have not actually written any VB6 code in years, maybe someone else can actually explain why behaves as it does.
Dim image
that is wrong
image = WebBrowser1.Document.getElementById("image")
that is right
set image = WebBrowser1.Document.getElementById("image")
dim image_src as String
image_src = image.src
How to get all the images, after decoding if possible, on a webpage through XPCOM ?
The image might be specified in HTML as a background url in some CSS property, inside img tag, or in any form that a web developer might have included.
I tried looking into imgIContainer, imgIDecodeObserver and many other interfaces. Although there is a way through which we can provide image URI to Mozilla so that it loads the image, decodes it and returns imgIContainer. But I couldn't find anyway to get all images in current webpage.
This has to be done in either Java or Javascript.
Any suggestions?
#Wladimir - Thanks for your help.
I want all the images including CSS constructs (background images). So now I am listening to events from nsIWebProgressListener.
onStateChange: function(webProgress, request, stateFlags, status) {
if ((~stateFlags & (nsIWebProgressListener.STATE_IS_REQUEST | nsIWebProgressListener.STATE_STOP)) == 0) {
var imgReq = request.QueryInterface(CI.imgIRequest);
if (imgReq)
var img = imgReq.image;
}
}
The problem is that request.QueryInterface(CI.imgIRequest) throws exception for all NON-image requests. Although those exceptions can be ignored by putting code inside try-catch block, but I'd prefer to do things cleanly.
Is there any condition that can be checked to know whether request is for image or not?
There is existing code that you can look at. The Page Info dialog has a Media tab that successfully shows most images on the page. The important function is grabAll() in pageInfo.js, it is called for each element (via a TreeWalker). As you can see, there is no generic way to get the image, this function rather uses window.getComputedStyle() to extract the values of a bunch of the CSS properties for this element: background-image, border-image, list-style-image, cursor. It will also look for <img>, <svg:image>, <link> (favicon), <input>, <button>, <object> and <embed> tags. It doesn't manage to recognize everything however, e.g. these CSS constructs will not be recognized:
.foo:before
{
content: url(image.png);
}
.foo:hover
{
background-image: url(image.png);
}
Still, this is probably as far as you can get - unless you want to look at the requests made by the web page as it loads.
Edit: If you look at the requests as they are performed (via a web progress listener), you can do the following:
if (request instanceof CI.imgIRequest)
var img = request.URI.spec;
Note that request.image won't help you much, almost all methods of imgIContainer are only accessible from native code.