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IKeyboardHandlerOnPreKeyEvent Method
Version 51.0.0
Called before a keyboard event is sent to the renderer. Return true if the event was handled or false otherwise. If the event will be handled in OnKeyEvent(IWebBrowser, IBrowser, KeyType, Int32, Int32, CefEventFlags, Boolean) as a keyboard shortcut set isKeyboardShortcut to true and return false.

Namespace: CefSharp
Assembly: CefSharp (in CefSharp.dll) Version: (
bool OnPreKeyEvent(
	IWebBrowser browserControl,
	IBrowser browser,
	KeyType type,
	int windowsKeyCode,
	int nativeKeyCode,
	CefEventFlags modifiers,
	bool isSystemKey,
	ref bool isKeyboardShortcut


Type: CefSharpIWebBrowser
The IWebBrowser control this request is for.
Type: CefSharpIBrowser
The browser instance.
Type: CefSharpKeyType
Whether this was a key up/down/raw/etc...
Type: SystemInt32
The Windows key code for the key event. This value is used by the DOM specification. Sometimes it comes directly from the event (i.e. on Windows) and sometimes it's determined using a mapping function. See WebCore/platform/chromium/KeyboardCodes.h for the list of values.
Type: SystemInt32
The native key code. On Windows this appears to be in the format of WM_KEYDOWN/WM_KEYUP/etc... lParam data.
Type: CefSharpCefEventFlags
What other modifier keys are currently down: Shift/Control/Alt/OS X Command/etc...
Type: SystemBoolean
Indicates whether the event is considered a "system key" event (see for details).
Type: SystemBoolean
See the summary for an explanation of when to set this to true.

Return Value

Type: Boolean
Returns true if the event was handled or false otherwise.
See Also