[WebView] How to clear all cached data? about tizenfx

[ppaneksamsung]

For my particular case, calling ewk_context_web_storage_delete_all fixes the issue. I used following extension method:

internal static partial class Interop
{
    private static class Libraries
    {
        internal const string ChromiumEwk = "libchromium-ewk.so";
    }

    internal static partial class ChromiumEwk
    {
        [DllImport(Libraries.ChromiumEwk)]
        internal static extern bool ewk_context_web_storage_delete_all(IntPtr context);
    }
}

public static class ContextExtensions
{
    private static IntPtr GetHandle(this Context context)
    {
        var contextType = context.GetType();
        var handleField = contextType.GetField(
            "_handle",
            BindingFlags.Instance | BindingFlags.NonPublic);
        if (handleField == null)
            throw new NotSupportedException("Context doesn't have a _handle field");
        if (handleField.FieldType != typeof(IntPtr))
            throw new NotSupportedException(
                $"Unexpected field type. Expected {typeof(IntPtr)}, got {handleField.FieldType}");
        return (IntPtr) handleField.GetValue(context);
    }

    public static bool DeleteWebStorage(this Context context)
    {
        var handle = context.GetHandle();
        return Interop.ChromiumEwk.ewk_context_web_storage_delete_all(handle);
    }        
}

Consider to expose this CAPI. Another possible solution for my problem would be to launch a WebView in incognito mode, but I'm not sure if it's exposed now.

[ppaneksamsung]

The problem seems to be a little bit more complex. It looks like Tizen.WebView was designed to be used as a 'singleton'. I use the AddJavaScriptMessageHandler method (https://github.com/Samsung/TizenFX/blob/master/src/Tizen.WebView/Tizen.WebView/WebView.cs#L432) and this method adds a handler to static _javaScriptMessageHandlerMap dictionary. I don't see any option to remove already registered JS message handler. This is a problem in following case:

• create 1st WebView
• register JS message handler with some name
• destroy 1st WebView
• create 2nd WebView
• register JS message handler with the same name as for 1st WebView

Second AddJavaScriptMessageHandler call fails due to:

TizenFX/src/Tizen.WebView/Tizen.WebView/WebView.cs

Line 436 in 1909fda

if (_javaScriptMessageHandlerMap.ContainsKey(name))

[github-actions]

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