WebView Not Scaling With Zoom Factor

[Casey Kolb]

We're trying to get the WebView component to scale automatically with the plugin zoom factor but we're not sure how. Is this something we need to handle or is this a bug with the component?

[Dan Korneff]

Is WebView like an embedded web browser?

[d.healey]

@Dan-Korneff https://forum.hise.audio/topic/7629/choc/7?_=1689121523376

[Christoph Hart]

This was rather complicated but I have put in some extra effort to support the scale factor (in fact 50% of the implementation time went into this issue).

What OS? And check the compiled plugin, the interface designer does not use the plugin scale factor so zooming in there might not work.

Do the webview examples scale correctly?

[ulrik]

@Christoph-Hart said in WebView Not Scaling With Zoom Factor:

Do the webview examples scale correctly?

Compiled as stand alones (Mac), yes.

[Casey Kolb]

@Christoph-Hart On Mac for me, but I'll do some additional testing.
On startup, I think the issue was when you load the standalone at 125% from your saved settings the WebView wouldn't automatically scale.

[Casey Kolb]

@Christoph-Hart Here's an example of what happens when we load CUBE standalone at 125% with our login view:

The WebView doesn't scale to the 125% setting like the rest of the interface. Maybe there just needs to be a check on startup?

[Christoph Hart]

@Casey-Kolb no the webview examples in the tutorial scale correctly when restarted. I noticed that there is a small delay in the login popup. Maybe it happens only if the visibility is changed after startup, I'll check that.

[Christoph Hart]

Actually the preset browser example had the same issue. I've fixed it by introducing a small delay for the scale factor update - it seems that if the webview isn't loaded, then the scaling update will be ignored.

Let me know if that helped.

[Casey Kolb]

@Christoph-Hart Excellent! I'll try it out.

[Christoph Hart]

@Casey-Kolb Actually I found a better fix - the previous one was relying on a timer delay which might work, but now it's much more reliable because it executes the scale factor update when the DOM is loaded.

Let me know if that's better. I need to test this on Windows tomorrow, but on macOS it's much more stable IMHO.

[Casey Kolb]

@Christoph-Hart Yep, this worked like a charm on Mac.

[Christoph Hart]

One thing I noticed is that now you cannot use window.innerWidth / window.innerHeight in your JS code anymore as this will be initialized correctly once but will not be updated correctly when the scale factor changes. Instead, just use the actual size of the webview as fixed pixel value, then it works.

[Brian]

@Christoph-Hart quick side question , if we have audio being streamed via the browser from a web url source ( context being able to preview a demo of a sound etc.) I am assuming that this will not play through HISE. Might there be a way to be able to set this via scripting ? :)

[Christoph Hart]

@Brian Getting access to the webviews audio output is not possible but if it's just for streaming a demo track you could just call a HISE function from your JS that will download the particular file and start previewing it.

Webview code:

<button onclick='onPreview("beat.wav")'>Preview</button>

<div id="valueDisplay">This will show the preview progress</div>

<script>
window.onFileLoad = function(message)
{
  document.getElementById("valueDisplay").innerHTML = message;
}
</script>

HISE:

inline function playFile(f)
{
	local channels = f.loadAsAudioFile();
				
	for(c in channels)
		c *= 0.125; // apply -12dB gain
		
	Engine.playBuffer(channels, function(args, obj){
		wv.callFunction("onFileLoad", "Position: " + obj);
	}, f.loadAudioMetadata().SampleRate);
}

function onPreview(args)
{
	Server.setBaseURL("https://hise.audio");
	
	var f = FileSystem.getFolder(FileSystem.Desktop).getChildFile(args[0]);
	
	if(f.isFile())
	{
		playFile(f);
	}
	else
	{
		Server.downloadFile(args[0], {}, f, function [f]()
		{
			var message = "Downloading ";
			
			message += Engine.doubleToString(this.data.numDownloaded / 1024.0 / 1024.0, 1);
		    message += "MB / " + Engine.doubleToString(this.data.numTotal / 1024.0 / 1024.0, 1) + "MB";
		    
		    wv.callFunction("onFileLoad", message);
		     
		    if(this.data.finished && this.data.success)
				playFile(f);
		});
	}
}

wv.bindCallback("previewFile", onPreview);

[Brian]

@Christoph-Hart thank you! That should do the job just perfectly! We'll report back on how this goes :)