cef/include/capi/views/cef_view_delegate_capi.h

// Copyright (c) 2020 Marshall A. Greenblatt. All rights reserved.
//
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// $hash=52cd273ebe5d458482a830c8ca777907c6c21cc2$
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#ifndef CEF_INCLUDE_CAPI_VIEWS_CEF_VIEW_DELEGATE_CAPI_H_
#define CEF_INCLUDE_CAPI_VIEWS_CEF_VIEW_DELEGATE_CAPI_H_
#pragma once

#include "include/capi/cef_base_capi.h"

#ifdef __cplusplus
extern "C" {
#endif

struct _cef_view_t;

///
// Implement this structure to handle view events. The functions of this
// structure will be called on the browser process UI thread unless otherwise
// indicated.
///
typedef struct _cef_view_delegate_t {
  ///
  // Base structure.
  ///
  cef_base_ref_counted_t base;

  ///
  // Return the preferred size for |view|. The Layout will use this information
  // to determine the display size.
  ///
  cef_size_t(CEF_CALLBACK* get_preferred_size)(
      struct _cef_view_delegate_t* self,
      struct _cef_view_t* view);

  ///
  // Return the minimum size for |view|.
  ///
  cef_size_t(CEF_CALLBACK* get_minimum_size)(struct _cef_view_delegate_t* self,
                                             struct _cef_view_t* view);

  ///
  // Return the maximum size for |view|.
  ///
  cef_size_t(CEF_CALLBACK* get_maximum_size)(struct _cef_view_delegate_t* self,
                                             struct _cef_view_t* view);

  ///
  // Return the height necessary to display |view| with the provided |width|. If
  // not specified the result of get_preferred_size().height will be used by
  // default. Override if |view|'s preferred height depends upon the width (for
  // example, with Labels).
  ///
  int(CEF_CALLBACK* get_height_for_width)(struct _cef_view_delegate_t* self,
                                          struct _cef_view_t* view,
                                          int width);

  ///
  // Called when the parent of |view| has changed. If |view| is being added to
  // |parent| then |added| will be true (1). If |view| is being removed from
  // |parent| then |added| will be false (0). If |view| is being reparented the
  // remove notification will be sent before the add notification. Do not modify
  // the view hierarchy in this callback.
  ///
  void(CEF_CALLBACK* on_parent_view_changed)(struct _cef_view_delegate_t* self,
                                             struct _cef_view_t* view,
                                             int added,
                                             struct _cef_view_t* parent);

  ///
  // Called when a child of |view| has changed. If |child| is being added to
  // |view| then |added| will be true (1). If |child| is being removed from
  // |view| then |added| will be false (0). If |child| is being reparented the
  // remove notification will be sent to the old parent before the add
  // notification is sent to the new parent. Do not modify the view hierarchy in
  // this callback.
  ///
  void(CEF_CALLBACK* on_child_view_changed)(struct _cef_view_delegate_t* self,
                                            struct _cef_view_t* view,
                                            int added,
                                            struct _cef_view_t* child);

  ///
  // Called when |view| gains focus.
  ///
  void(CEF_CALLBACK* on_focus)(struct _cef_view_delegate_t* self,
                               struct _cef_view_t* view);

  ///
  // Called when |view| loses focus.
  ///
  void(CEF_CALLBACK* on_blur)(struct _cef_view_delegate_t* self,
                              struct _cef_view_t* view);
} cef_view_delegate_t;

#ifdef __cplusplus
}
#endif

#endif  // CEF_INCLUDE_CAPI_VIEWS_CEF_VIEW_DELEGATE_CAPI_H_