cef/include/views/cef_view_delegate.h

// Copyright (c) 2016 Marshall A. Greenblatt. All rights reserved.
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#ifndef CEF_INCLUDE_VIEWS_CEF_VIEW_DELEGATE_H_
#define CEF_INCLUDE_VIEWS_CEF_VIEW_DELEGATE_H_
#pragma once

#include "include/cef_base.h"

class CefView;

///
/// Implement this interface to handle view events. All size and position values
/// are in density independent pixels (DIP) unless otherwise indicated. The
/// methods of this class will be called on the browser process UI thread unless
/// otherwise indicated.
///
/*--cef(source=client)--*/
class CefViewDelegate : public virtual CefBaseRefCounted {
 public:
  ///
  /// Return the preferred size for |view|. The Layout will use this information
  /// to determine the display size.
  ///
  /*--cef()--*/
  virtual CefSize GetPreferredSize(CefRefPtr<CefView> view) {
    return CefSize();
  }

  ///
  /// Return the minimum size for |view|.
  ///
  /*--cef()--*/
  virtual CefSize GetMinimumSize(CefRefPtr<CefView> view) { return CefSize(); }

  ///
  /// Return the maximum size for |view|.
  ///
  /*--cef()--*/
  virtual CefSize GetMaximumSize(CefRefPtr<CefView> view) { return CefSize(); }

  ///
  /// Return the height necessary to display |view| with the provided |width|.
  /// If not specified the result of GetPreferredSize().height will be used by
  /// default. Override if |view|'s preferred height depends upon the width
  /// (for example, with Labels).
  ///
  /*--cef()--*/
  virtual int GetHeightForWidth(CefRefPtr<CefView> view, int width) {
    return 0;
  }

  ///
  /// Called when the parent of |view| has changed. If |view| is being added to
  /// |parent| then |added| will be true. If |view| is being removed from
  /// |parent| then |added| will be false. If |view| is being reparented the
  /// remove notification will be sent before the add notification. Do not
  /// modify the view hierarchy in this callback.
  ///
  /*--cef()--*/
  virtual void OnParentViewChanged(CefRefPtr<CefView> view,
                                   bool added,
                                   CefRefPtr<CefView> parent) {}

  ///
  /// Called when a child of |view| has changed. If |child| is being added to
  /// |view| then |added| will be true. If |child| is being removed from |view|
  /// then |added| will be false. 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.
  ///
  /*--cef()--*/
  virtual void OnChildViewChanged(CefRefPtr<CefView> view,
                                  bool added,
                                  CefRefPtr<CefView> child) {}

  ///
  /// Called when |view| is added or removed from the CefWindow.
  ///
  /*--cef()--*/
  virtual void OnWindowChanged(CefRefPtr<CefView> view, bool added) {}

  ///
  /// Called when the layout of |view| has changed.
  ///
  /*--cef()--*/
  virtual void OnLayoutChanged(CefRefPtr<CefView> view,
                               const CefRect& new_bounds) {}

  ///
  /// Called when |view| gains focus.
  ///
  /*--cef()--*/
  virtual void OnFocus(CefRefPtr<CefView> view) {}

  ///
  /// Called when |view| loses focus.
  ///
  /*--cef()--*/
  virtual void OnBlur(CefRefPtr<CefView> view) {}

  ///
  /// Called when the theme for |view| has changed, after the new theme colors
  /// have already been applied. This will be called at least one time when
  /// |view| is added to a parent View. Further theme changes can be disabled by
  /// passing the `--force-dark-mode` or `--force-light-mode` command-line flag.
  /// Optionally use this callback to override the new theme colors by calling
  /// the appropriate CefView methods (SetBackgroundColor, etc).
  ///
  /*--cef()--*/
  virtual void OnThemeChanged(CefRefPtr<CefView> view) {}
};

#endif  // CEF_INCLUDE_VIEWS_CEF_WINDOW_DELEGATE_H_