Settings

A Settings object used for providing special CEF Browser initialization flags.

CommandLineSwitches

For a list of command line switches please have a look here:  https://peter.sh/experiments/chromium-command-line-switches

 

Default WebKitX CEF3 Command Line Switches are:

CommandLineSwitches

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-allow-file-access -allow-file-access-from-files -allow-insecure-localhost -allow-running-insecure-content -allow-silent-push -always-authorize-plugins -cipher-suite-blacklist=0x0005,0x0004,0x002f,0xc012,0xc011,0x003c,0xc011,0x0032,0xc007,0xc00c -disable-domain-blocking-for-3d-apis -disable-machine-cert-request -disable-origin-chip -enable-async-dns -enable-download-resumption -enable-encrypted-media -enable-es3-apis -enable-experimental-canvas-features -enable-font-antialiasing -enable-smooth-scrolling -enable-webgl-draft-extensions -expose-internals-for-testing -ignore-certificate-errors -ignore-gpu-blacklist -ignore-urlfetcher-cert-requests -javascript-harmony -print-to-pdf -reduce-security-for-testing -repl -save-page-as-mhtml -ssl-version-min=tls1

Performance Tips

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Private Sub Editor_OnCreate(ByVal Settings As WebKitXCEF3Lib.ISettings, CommandLineSwitches As String) On Error Resume Next With Settings .app_path = FS.GetAbsolutePathName(App.Path) .accept_language_list = "es-CL,en-GB" .persist_session_cookies = 0 .persist_user_preferences = 0 .show_context_menu = False .asynchronous_com_events = True End With CommandLineSwitches = CommandLineSwitches + " --no-proxy-server --disable-cache --disable-gpu-program-cache --disable-gpu-shader-disk-cache" CommandLineSwitches = CommandLineSwitches + " --disable-background-networking --disable-background-timer-throttling --disable-backgrounding-occluded-windows" CommandLineSwitches = CommandLineSwitches + " --disable-breakpad --disable-client-side-phishing-detection --disable-default-apps --disable-dev-shm-usage " CommandLineSwitches = CommandLineSwitches + " --disable-renderer-backgrounding --disable-sync --metrics-recording-only --no-first-run --no-default-browser-check" End Sub

 

OnCreate event provides you a Settings object that controls CEF3 Application and CEF3 Browser creation and initialization settings. The recommended defaults are preset in this object but you may want to provide your own settings such as Localization, Cache paths, Security settings, etc. The second parameter is CommandLineSwitches that are additional CEF3 preferences and even JavaScript flags that you want to provide to CEF3 Client Processes.

Loading Sequence

WebKitX provides several Events during its initialization, creation of the browser and loading of a URL. First you need to set the licensing information by handling the early Form Loading or Creation event. Then you can control CEF Browser creation by handling the OnCreate event. Once the browser is ready it will emit the the OnBrowserReady event where you can enable JavaScript or HTML5 editing parameters. In OnBrowserReady you should also load the HTML5 markup or navigate to the URL you want to load.

During loading WebKitX will fire several loading events such as OnLoadStart and OnLoadEnd. If you are loading HTML with frames (IFRAMEs) then some events will fire multiple times, such as OnPageLoadStart and OnPageLoadEnd. When the main frame is loaded WebKitX will fire OnLoadEnd and when all frames have loaded WebKitX will fire the OnPageComplete event.     

When you receive the OnLoadEnd and OnPageLoadEnd events, it means that network-wise the contents have downloaded but HTML-wise the contents might not be fully parsed yet. In HTML terms this means that document.readyState value might not not set to complete. Pages in window or sub frames might be in interactive state and resources might be loading in the background. The only event that guarantees that the main window frame and all sub-frames have document.readyState = complete is OnPageComplete.

Internally, WebKitX uses an asynchronous task that checks the document.readyState for all frames; if this check result is "complete" with a count equal to browser frames, then the event is fired. If some frames have loaded while other frames have failed, the event will not fire. The check takes place on a fresh HTML DOM snapshot obtained every time at the moment of the check, and examines the current number of frames. The frames must remain unchanged for 3 seconds before the event is fired; this way, any dynamic loading or unloading of frames is taken into account.

Please note that some frameworks such as Angular and React dynamically load portions of the page. WebKitX events will keep firing while dynamic content is downloaded. You need to examine the behavior of the control in relation with the web site you want to display and adjust your event handling accordingly.

WebKitXCEF3 Object  | WebKitXCEF3 Members  | Settings Object  | Create Method

Introduction

Loading Sequence