# Class TCustomLifeSpanHandler

Description
Hierarchy
Fields
Methods
Properties

## Unit

uCEFLifeSpanHandler

## Declaration

`type TCustomLifeSpanHandler = class(TCefLifeSpanHandlerOwn)`

## Description

This item has no description.

## Hierarchy

- TInterfacedObject
- TCefBaseRefCountedOwn
- TCefLifeSpanHandlerOwn
- TCustomLifeSpanHandler

## Overview

### Fields

| `FEvents: Pointer;`

### Methods

`function OnBeforePopup(const browser: ICefBrowser; const frame: ICefFrame; popup_id: Integer; const targetUrl, targetFrameName: ustring; targetDisposition: TCefWindowOpenDisposition; userGesture: Boolean; const popupFeatures: TCefPopupFeatures; var windowInfo: TCefWindowInfo; var client: ICefClient; var settings: TCefBrowserSettings; var extra_info: ICefDictionaryValue; var noJavascriptAccess: Boolean): Boolean; override;`

| `procedure OnBeforePopupAborted(const browser: ICefBrowser; popup_id: Integer); override;`
| `procedure OnBeforeDevToolsPopup(const browser: ICefBrowser; var windowInfo: TCefWindowInfo; var client: ICefClient; var settings: TCefBrowserSettings; var extra_info: ICefDictionaryValue; var use_default_window: boolean); override;`
| `procedure OnAfterCreated(const browser: ICefBrowser); override;`
| `function DoClose(const browser: ICefBrowser): Boolean; override;`
| `procedure OnBeforeClose(const browser: ICefBrowser); override;`
| `procedure RemoveReferences; override;`
| `constructor Create(const events : IChromiumEvents); reintroduce; virtual;`
| `destructor Destroy; override;`

## Description

### Fields

| `FEvents: Pointer;`
This item has no description.

### Methods

`function OnBeforePopup(const browser: ICefBrowser; const frame: ICefFrame; popup_id: Integer; const targetUrl, targetFrameName: ustring; targetDisposition: TCefWindowOpenDisposition; userGesture: Boolean; const popupFeatures: TCefPopupFeatures; var windowInfo: TCefWindowInfo; var client: ICefClient; var settings: TCefBrowserSettings; var extra_info: ICefDictionaryValue; var noJavascriptAccess: Boolean): Boolean; override;`

This item has no description. Showing description inherited from ICefLifeSpanHandler.OnBeforePopup.

Called on the UI thread before a new popup browser is created. The |browser| and |frame| values represent the source of the popup request (opener browser and frame). The |popup_id| value uniquely identifies the popup in the context of the opener browser. The |target_url| and |target_frame_name| values indicate where the popup browser should navigate and may be NULL if not specified with the request. The |target_disposition| value indicates where the user intended to open the popup (e.g. current tab, new tab, etc). The |user_gesture| value will be true (1) if the popup was opened via explicit user gesture (e.g. clicking a link) or false (0) if the popup opened automatically (e.g. via the DomContentLoaded event). The |popupFeatures| structure contains additional information about the requested popup window. To allow creation of the popup browser optionally modify |windowInfo|, |client|, |settings| and |no_javascript_access| and return false (0). To cancel creation of the popup browser return true (1). The |client| and |settings| values will default to the source browser's values. If the |no_javascript_access| value is set to false (0) the new browser will not be scriptable and may not be hosted in the same renderer process as the source browser. Any modifications to |windowInfo| will be ignored if the parent browser is wrapped in a cef_browser_view_t. The |extra_info| parameter provides an opportunity to specify extra information specific to the created popup browser that will be passed to cef_render_process_handler_t::on_browser_created() in the render process.

If popup browser creation succeeds then OnAfterCreated will be called for the new popup browser. If popup browser creation fails, and if the opener browser has not yet been destroyed, then OnBeforePopupAborted will be called for the opener browser. See OnBeforePopupAborted documentation for additional details.

| `procedure OnBeforePopupAborted(const browser: ICefBrowser; popup_id: Integer); override;`

This item has no description. Showing description inherited from ICefLifeSpanHandler.OnBeforePopupAborted.

Called on the CEF UI thread if a new popup browser is aborted. This only occurs if the popup is allowed in OnBeforePopup and creation fails before OnAfterCreated is called for the new popup browser. The |browser| value is the source of the popup request (opener browser). The |popup_id| value uniquely identifies the popup in the context of the opener browser, and is the same value that was passed to OnBeforePopup.

Any client state associated with pending popups should be cleared in OnBeforePopupAborted, OnAfterCreated of the popup browser, or OnBeforeClose of the opener browser. OnBeforeClose of the opener browser may be called before this function in cases where the opener is closing during popup creation, in which case ICefBrowser.IsValid will return false (0) in this function.

| `procedure OnBeforeDevToolsPopup(const browser: ICefBrowser; var windowInfo: TCefWindowInfo; var client: ICefClient; var settings: TCefBrowserSettings; var extra_info: ICefDictionaryValue; var use_default_window: boolean); override;`

This item has no description. Showing description inherited from ICefLifeSpanHandler.OnBeforeDevToolsPopup.

Called on the UI thread before a new DevTools popup browser is created. The |browser| value represents the source of the popup request. Optionally modify |windowInfo|, |client|, |settings| and |extra_info| values. The |client|, |settings| and |extra_info| values will default to the source browser's values. Any modifications to |windowInfo| will be ignored if the parent browser is Views-hosted (wrapped in a ICefBrowserView).

The |extra_info| parameter provides an opportunity to specify extra information specific to the created popup browser that will be passed to ICefRenderProcessHandler.OnBrowserCreated() in the render process. The existing |extra_info| object, if any, will be read-only but may be replaced with a new object.

Views-hosted source browsers will create Views-hosted DevTools popups unless |use_default_window| is set to to true (1). DevTools popups can be blocked by returning true (1) from ICefCommandHandler.OnChromeCommand for IDC_DEV_TOOLS. Only used with Chrome style.

| `procedure OnAfterCreated(const browser: ICefBrowser); override;`
This item has no description. Showing description inherited from ICefLifeSpanHandler.OnAfterCreated. Called after a new browser is created. It is now safe to begin performing actions with |browser|. ICefFrameHandler callbacks related to initial main frame creation will arrive before this callback. See ICefFrameHandler documentation for additional usage information.

| `function DoClose(const browser: ICefBrowser): Boolean; override;`

This item has no description. Showing description inherited from ICefLifeSpanHandler.DoClose.

Called when an Alloy style browser is ready to be closed, meaning that the close has already been initiated and that JavaScript unload handlers have already executed or should be ignored. This may result directly from a call to TChromiumCore.[Try]CloseBrowser() or indirectly if the browser's top-level parent window was created by CEF and the user attempts to close that window (by clicking the 'X', for example). TChromiumCore.OnClose will not be called if the browser's host window/view has already been destroyed (via parent window/view hierarchy tear-down, for example), as it is no longer possible to customize the close behavior at that point.

An application should handle top-level parent window close notifications by calling TChromiumCore.TryCloseBrowser() or TChromiumCore.CloseBrowser(false) instead of allowing the window to close immediately (see the examples below). This gives CEF an opportunity to process JavaScript unload handlers and optionally cancel the close before TChromiumCore.OnClose is called.

When windowed rendering is enabled CEF will create an internal child window/view to host the browser. In that case returning false (0) from TChromiumCore.OnClose will send the standard close notification to the browser's top- level parent window (e.g. WM_CLOSE on Windows, performClose: on OS X, "delete_event" on Linux or TCEFWindowComponent.OnCanClose callback from Views).

When windowed rendering is disabled there is no internal window/view and returning false (0) from TChromiumCore.OnClose will cause the browser object to be destroyed immediately.

If the browser's top-level parent window requires a non-standard close notification then send that notification from TChromiumCore.OnClose and return true (1). You are still required to complete the browser close as soon as possible (either by calling TChromiumCore.[Try]CloseBrowser() or by proceeding with window/view hierarchy tear-down), otherwise the browser will be left in a partially closed state that interferes with proper functioning. Top-level windows created on the browser process UI thread can alternately call TChromiumCore.IsReadyToBeClosed() in the close handler to check close status instead of relying on custom TChromiumCore.OnClose handling. See documentation on that function for additional details.

The TChromiumCore.OnBeforeClose event will be called after TChromiumCore.OnClose (if TChromiumCore.OnClose is called) and immediately before the browser object is destroyed. The application should only exit after TChromiumCore.OnBeforeClose has been called for all existing browsers.

The below examples describe what should happen during window close when the browser is parented to an application-provided top-level window.

Example 1: Using TChromiumCore.TryCloseBrowser(). This is recommended for clients using standard close handling and windows created on the browser process UI thread.

    1.  User clicks the window close button which sends a close notification
        to the application's top-level window.
    2.  Application's top-level window receives the close notification and
        calls TChromiumCore.TryCloseBrowser() (similar to calling TChromiumCore.CloseBrowser(false)).
        TChromiumCore.TryCloseBrowser() returns false so the client cancels the window
        close.
    3.  JavaScript 'onbeforeunload' handler executes and shows the close
        confirmation dialog (which can be overridden via TChromiumCore.OnBeforeUnloadDialog).
    4.  User approves the close.
    5.  JavaScript 'onunload' handler executes.
    6.  Application's TChromiumCore.OnClose handler is called and returns false (0) by
        default.
    7.  CEF sends a close notification to the application's top-level window
        (because TChromiumCore.OnClose returned false).
    8.  Application's top-level window receives the close notification and
        calls TryCloseBrowser(). TryCloseBrowser() returns true so the client
        allows the window close.
    9.  Application's top-level window is destroyed, triggering destruction
        of the child browser window.
    10. Application's TChromiumCore.OnBeforeClose handler is called and the browser object
        is destroyed.
    11. Application exits by calling TCefApplicationCore.QuitMessageLoop if no other browsers
        exist.

Example 2: Using TChromiumCore.CloseBrowser(false) and implementing the TChromiumCore.OnClose event. This is recommended for clients using non-standard close handling or windows that were not created on the browser process UI thread.

    1.  User clicks the window close button which sends a close notification
        to the application's top-level window.
    2.  Application's top-level window receives the close notification and:
        A. Calls ICefBrowserHost.CloseBrowser(false).
        B. Cancels the window close.
    3.  JavaScript 'onbeforeunload' handler executes and shows the close
        confirmation dialog (which can be overridden via TChromiumCore.OnBeforeUnloadDialog).
    4.  User approves the close.
    5.  JavaScript 'onunload' handler executes.
    6.  Application's TChromiumCore.OnClose handler is called. Application will:
        A. Set a flag to indicate that the next top-level window close attempt
           will be allowed.
        B. Return false.
    7.  CEF sends a close notification to the application's top-level window
        (because TChromiumCore.OnClose returned false).
    8.  Application's top-level window receives the close notification and
        allows the window to close based on the flag from #6A.
    9.  Application's top-level window is destroyed, triggering destruction
        of the child browser window.
    10. Application's TChromiumCore.OnBeforeClose handler is called and the browser object
        is destroyed.
    11. Application exits by calling TCefApplicationCore.QuitMessageLoop if no other browsers exist.

| `procedure OnBeforeClose(const browser: ICefBrowser); override;`

This item has no description. Showing description inherited from ICefLifeSpanHandler.OnBeforeClose.

Called just before a browser is destroyed. Release all references to the browser object and do not attempt to execute any functions on the browser object (other than IsValid, GetIdentifier or IsSame) after this callback returns. ICefFrameHandler callbacks related to final main frame destruction, and OnBeforePopupAborted callbacks for any pending popups, will arrive after this callback and ICefBrowser.IsValid will return false (0) at that time. Any in-progress network requests associated with |browser| will be aborted when the browser is destroyed, and ICefResourceRequestHandler callbacks related to those requests may still arrive on the IO thread after this callback. See ICefFrameHandler and DoClose() documentation for additional usage information.

| `procedure RemoveReferences; override;`
This item has no description. Showing description inherited from ICefLifeSpanHandler.RemoveReferences. Custom procedure to clear all references.

| `constructor Create(const events : IChromiumEvents); reintroduce; virtual;`
This item has no description.

| `destructor Destroy; override;`
This item has no description.

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