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Showing content from https://cefsharp.github.io/api/118.6.x/html/T_CefSharp_WinForms_Handler_LifeSpanHandler.htm below:

CefSharp.WinForms (in CefSharp.WinForms.dll) Version: 118.6.80.0 (118.6.80.0)

public class LifeSpanHandler : LifeSpanHandler

public ref class LifeSpanHandler : public LifeSpanHandler

The LifeSpanHandler type exposes the following members.

Create a new instance of the

which can be used to create a WinForms specific

implementation that simplifies the process of hosting a Popup as a Control/Tab. In scnarios where you also need to implement

then instead of implementing directly you will need to inherit from

. As it provides base functionality required to make

events work correctly.

Called when a browser has recieved a request to close. This may result directly from a call to CefBrowserHost::CloseBrowser() or indirectly if the browser is a top-level OS window created by CEF and the user attempts to close the window. This method will be called after the JavaScript 'onunload' event has been fired. It will not be called for browsers after the associated OS window has been destroyed (for those browsers it is no longer possible to cancel the close). If CEF created an OS window for the browser returning false will send an OS close notification to the browser window's top-level owner (e.g. WM_CLOSE on Windows). If no OS window exists (window rendering disabled) returning false will cause the browser object to be destroyed immediately. Return true if the browser is parented to another window and that other window needs to receive close notification via some non-standard technique. !!IMPORTANT!!: Behaviour of this implementation differs from the default, the WM_CLOSE message is only sent by default for popups (return false), for the main browser we return true to cancel this behaviour. If an application provides its own top-level window it should handle OS close notifications by calling CefBrowserHost::CloseBrowser(false) instead of immediately closing (see the example below). This gives CEF an opportunity to process the 'onbeforeunload' event and optionally cancel the close before DoClose() is called. The CefLifeSpanHandler::OnBeforeClose() method will be called immediately before the browser object is destroyed. The application should only exit after OnBeforeClose() has been called for all existing browsers. If the browser represents a modal window and a custom modal loop implementation was provided in CefLifeSpanHandler::RunModal() this callback should be used to restore the opener window to a usable state. By way of example consider what should happen during window close when the browser is parented to an application-provided top-level OS window. 1. User clicks the window close button which sends an OS close notification (e.g. WM_CLOSE on Windows, performClose: on OS-X and "delete_event" on Linux). 2. Application's top-level window receives the close notification and: A. Calls CefBrowserHost::CloseBrowser(false). B. Cancels the window close. 3. JavaScript 'onbeforeunload' handler executes and shows the close confirmation dialog (which can be overridden via CefJSDialogHandler::OnBeforeUnloadDialog()). 4. User approves the close. 5. JavaScript 'onunload' handler executes. 6. Application's DoClose() handler is called. Application will: A. Set a flag to indicate that the next close attempt will be allowed. B. Return false. 7. CEF sends an OS close notification. 8. Application's top-level window receives the OS close notification and allows the window to close based on the flag from #6B. 9. Browser OS window is destroyed. 10. Application's CefLifeSpanHandler::OnBeforeClose() handler is called and the browser object is destroyed. 11. Application exits by calling CefQuitMessageLoop() if no other browsers exist.

Determines whether the specified object is equal to the current object.

Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.

Serves as the default hash function.

Gets the

of the current instance.

Creates a shallow copy of the current

.

Called after a new browser is created.

Called before a CefBrowser window (either the main browser for

, or one of its children)

Called before a popup window is created. By default the popup (browser) is created in a new native window.

The

will be called

the popup has been created and can be used to cancel popup creation if required or modify

.

The

will be called when the

has been created. The

instance is valid until

is called.

provides low level access to the CEF Browser, you can access frames, view source, perform navigation (via frame) etc.

The

will be called when the

has been created. When the

is called you must add the control to it's intended parent so the

can be calculated to set the initial size correctly.

The

will be called when the

is to be removed from it's parent. When the

is called you must remove/dispose of the

.

Returns a string that represents the current object.

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