cef/include/capi/cef_frame_handler_capi.h

// Copyright (c) 2022 Marshall A. Greenblatt. All rights reserved.
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#ifndef CEF_INCLUDE_CAPI_CEF_FRAME_HANDLER_CAPI_H_
#define CEF_INCLUDE_CAPI_CEF_FRAME_HANDLER_CAPI_H_
#pragma once

#include "include/capi/cef_base_capi.h"
#include "include/capi/cef_browser_capi.h"
#include "include/capi/cef_frame_capi.h"

#ifdef __cplusplus
extern "C" {
#endif

///
// Implement this structure to handle events related to cef_frame_t life span.
// The order of callbacks is:
//
// (1) During initial cef_browser_host_t creation and navigation of the main
// frame: - cef_frame_handler_t::OnFrameCreated => The initial main frame object
// has been
//   created. Any commands will be queued until the frame is attached.
// - cef_frame_handler_t::OnMainFrameChanged => The initial main frame object
// has
//   been assigned to the browser.
// - cef_life_span_handler_t::OnAfterCreated => The browser is now valid and can
// be
//   used.
// - cef_frame_handler_t::OnFrameAttached => The initial main frame object is
// now
//   connected to its peer in the renderer process. Commands can be routed.
//
// (2) During further cef_browser_host_t navigation/loading of the main frame
// and/or sub-frames: - cef_frame_handler_t::OnFrameCreated => A new main frame
// or sub-frame object has
//   been created. Any commands will be queued until the frame is attached.
// - cef_frame_handler_t::OnFrameAttached => A new main frame or sub-frame
// object is
//   now connected to its peer in the renderer process. Commands can be routed.
// - cef_frame_handler_t::OnFrameDetached => An existing main frame or sub-frame
//   object has lost its connection to the renderer process. If multiple objects
//   are detached at the same time then notifications will be sent for any
//   sub-frame objects before the main frame object. Commands can no longer be
//   routed and will be discarded.
// - cef_frame_handler_t::OnMainFrameChanged => A new main frame object has been
//   assigned to the browser. This will only occur with cross-origin navigation
//   or re-navigation after renderer process termination (due to crashes, etc).
//
// (3) During final cef_browser_host_t destruction of the main frame: -
// cef_frame_handler_t::OnFrameDetached => Any sub-frame objects have lost their
//   connection to the renderer process. Commands can no longer be routed and
//   will be discarded.
// - cef_life_span_handler_t::OnBeforeClose => The browser has been destroyed. -
// cef_frame_handler_t::OnFrameDetached => The main frame object have lost its
//   connection to the renderer process. Notifications will be sent for any
//   sub-frame objects before the main frame object. Commands can no longer be
//   routed and will be discarded.
// - cef_frame_handler_t::OnMainFrameChanged => The final main frame object has
// been
//   removed from the browser.
//
// Cross-origin navigation and/or loading receives special handling.
//
// When the main frame navigates to a different origin the OnMainFrameChanged
// callback (2) will be executed with the old and new main frame objects.
//
// When a new sub-frame is loaded in, or an existing sub-frame is navigated to,
// a different origin from the parent frame, a temporary sub-frame object will
// first be created in the parent's renderer process. That temporary sub-frame
// will then be discarded after the real cross-origin sub-frame is created in
// the new/target renderer process. The client will receive cross-origin
// navigation callbacks (2) for the transition from the temporary sub-frame to
// the real sub-frame. The temporary sub-frame will not recieve or execute
// commands during this transitional period (any sent commands will be
// discarded).
//
// When a new popup browser is created in a different origin from the parent
// browser, a temporary main frame object for the popup will first be created in
// the parent's renderer process. That temporary main frame will then be
// discarded after the real cross-origin main frame is created in the new/target
// renderer process. The client will recieve creation and initial navigation
// callbacks (1) for the temporary main frame, followed by cross-origin
// navigation callbacks (2) for the transition from the temporary main frame to
// the real main frame. The temporary main frame may receive and execute
// commands during this transitional period (any sent commands may be executed,
// but the behavior is potentially undesirable since they execute in the parent
// browser's renderer process and not the new/target renderer process).
//
// Callbacks will not be executed for placeholders that may be created during
// pre-commit navigation for sub-frames that do not yet exist in the renderer
// process. Placeholders will have cef_frame_t::get_identifier() == -4.
//
// The functions of this structure will be called on the UI thread unless
// otherwise indicated.
///
typedef struct _cef_frame_handler_t {
  ///
  // Base structure.
  ///
  cef_base_ref_counted_t base;

  ///
  // Called when a new frame is created. This will be the first notification
  // that references |frame|. Any commands that require transport to the
  // associated renderer process (LoadRequest, SendProcessMessage, GetSource,
  // etc.) will be queued until OnFrameAttached is called for |frame|.
  ///
  void(CEF_CALLBACK* on_frame_created)(struct _cef_frame_handler_t* self,
                                       struct _cef_browser_t* browser,
                                       struct _cef_frame_t* frame);

  ///
  // Called when a frame can begin routing commands to/from the associated
  // renderer process. |reattached| will be true (1) if the frame was re-
  // attached after exiting the BackForwardCache. Any commands that were queued
  // have now been dispatched.
  ///
  void(CEF_CALLBACK* on_frame_attached)(struct _cef_frame_handler_t* self,
                                        struct _cef_browser_t* browser,
                                        struct _cef_frame_t* frame,
                                        int reattached);

  ///
  // Called when a frame loses its connection to the renderer process and will
  // be destroyed. Any pending or future commands will be discarded and
  // cef_frame_t::is_valid() will now return false (0) for |frame|. If called
  // after cef_life_span_handler_t::on_before_close() during browser destruction
  // then cef_browser_t::is_valid() will return false (0) for |browser|.
  ///
  void(CEF_CALLBACK* on_frame_detached)(struct _cef_frame_handler_t* self,
                                        struct _cef_browser_t* browser,
                                        struct _cef_frame_t* frame);

  ///
  // Called when the main frame changes due to (a) initial browser creation, (b)
  // final browser destruction, (c) cross-origin navigation or (d) re-navigation
  // after renderer process termination (due to crashes, etc). |old_frame| will
  // be NULL and |new_frame| will be non-NULL when a main frame is assigned to
  // |browser| for the first time. |old_frame| will be non-NULL and |new_frame|
  // will be NULL and  when a main frame is removed from |browser| for the last
  // time. Both |old_frame| and |new_frame| will be non-NULL for cross-origin
  // navigations or re-navigation after renderer process termination. This
  // function will be called after on_frame_created() for |new_frame| and/or
  // after on_frame_detached() for |old_frame|. If called after
  // cef_life_span_handler_t::on_before_close() during browser destruction then
  // cef_browser_t::is_valid() will return false (0) for |browser|.
  ///
  void(CEF_CALLBACK* on_main_frame_changed)(struct _cef_frame_handler_t* self,
                                            struct _cef_browser_t* browser,
                                            struct _cef_frame_t* old_frame,
                                            struct _cef_frame_t* new_frame);
} cef_frame_handler_t;

#ifdef __cplusplus
}
#endif

#endif  // CEF_INCLUDE_CAPI_CEF_FRAME_HANDLER_CAPI_H_