internal EvaluateTask(IChromiumWebBrowser wb, string code, JSInvokeMode invokeMode, Action<CfrV8Value, CfrV8Exception> callback)
{
this.wb = wb;
this.code = code;
this.invokeMode = invokeMode;
this.callback = callback;
lock (tasks) tasks.Add(this);
Execute += (s, e) => {
if (invokeMode == JSInvokeMode.Invoke || (invokeMode == JSInvokeMode.Inherit && wb.RemoteCallbacksWillInvoke))
wb.RenderThreadInvoke(() => Task_Execute(e));
else
Task_Execute(e);
lock (tasks) tasks.Remove(this);
};
}
/// <summary>
/// Evaluate a string of javascript code in the browser's main frame.
/// Evaluation is done asynchronously in the render process.
/// Returns false if the remote browser is currently unavailable.
/// If this function returns false, then |callback| will not be called. Otherwise,
/// |callback| will be called asynchronously in the context of the render thread.
///
/// If |invokeMode| is set to Invoke, |callback| will be called on the thread that
/// owns the browser's underlying window handle. If |invokeMode| is set to Inherit,
/// |callback| will be called according to RemoteCallbackInvokeMode.
///
/// Use with care:
/// The callback may never be called if the render process gets killed prematurely.
/// On success the CfrV8Value argument of the callback will be set to the return value
/// of the evaluated script, if any. On failure the CfrV8Exception argument of the callback
/// will be set to the exception thrown by the evaluated script, if any.
/// Do not block the callback since it blocks the render thread.
/// </summary>
public bool EvaluateJavascript(string code, JSInvokeMode invokeMode, Action<CfrV8Value, CfrV8Exception> callback)
{
var rb = remoteBrowser;
if (rb == null) return false;
try
{
var ctx = rb.CreateRemoteCallContext();
ctx.Enter();
try
{
var taskRunner = CfrTaskRunner.GetForThread(CfxThreadId.Renderer);
var task = new EvaluateTask(this, code, invokeMode, callback);
taskRunner.PostTask(task);
return true;
}
finally
{
ctx.Exit();
}
}
catch (CfxRemotingException)
{
return false;
}
}
/// <summary>
/// Creates a new javascript object to be added as a property
/// to a browser frame's global object or a child object.
/// </summary>
public JSObject(JSInvokeMode invokeMode)
: base(JSPropertyType.Object, invokeMode)
{
}
/// <summary>
/// Creates a new javascript function to be added as a property
/// to a browser frame's global object or to a child object.
/// </summary>
public JSFunction(JSInvokeMode invokeMode)
: base(JSPropertyType.Function, invokeMode)
{
}
public bool EvaluateJavascript(string code, JSInvokeMode invokeMode, Action <CfrV8Value, CfrV8Exception> callback)
{
return(((IChromiumWebBrowser)browser).EvaluateJavascript(code, invokeMode, callback));
}
public bool EvaluateJavascript(string code, JSInvokeMode invokeMode, Action <CfrV8Value, CfrV8Exception> callback) => Chromium.EvaluateJavascript(code, invokeMode, callback);
