Mercurial > octave
view liboctave/util/action-container.h @ 33586:3216c01fd6a7 stable tip
fix dragging editor from main window into floating state (bug #65725)
* file-editor.cc (toplevel_changes): added missing call to original
slot octave_doc_widget::toplevel_changed
author | Torsten Lilge <ttl-octave@mailbox.org> |
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date | Tue, 14 May 2024 22:03:47 +0200 |
parents | 2e484f9f1f18 |
children | 4b601ca024d5 |
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//////////////////////////////////////////////////////////////////////// // // Copyright (C) 1993-2024 The Octave Project Developers // // See the file COPYRIGHT.md in the top-level directory of this // distribution or <https://octave.org/copyright/>. // // This file is part of Octave. // // Octave is free software: you can redistribute it and/or modify it // under the terms of the GNU General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // // Octave is distributed in the hope that it will be useful, but // WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with Octave; see the file COPYING. If not, see // <https://www.gnu.org/licenses/>. // //////////////////////////////////////////////////////////////////////// #if ! defined (octave_action_container_h) #define octave_action_container_h 1 #include "octave-config.h" #include <atomic> #include <cstddef> #include <functional> // This class allows registering actions in a list for later // execution, either explicitly or when the container goes out of // scope. // FIXME: is there a better name for this class? OCTAVE_BEGIN_NAMESPACE(octave) OCTAVE_BEGIN_NAMESPACE(util) template <typename T> struct atomic_traits { typedef T type; }; template <typename T> struct atomic_traits<std::atomic<T>> { typedef T type; }; OCTAVE_END_NAMESPACE(util) class action_container { public: // A generic unwind_protect element. Knows how to run itself and // discard itself. Also, contains a pointer to the next element. class elem { public: friend class action_container; elem () { } OCTAVE_DISABLE_COPY_MOVE (elem) virtual ~elem () = default; virtual void run () { } }; // An element that merely runs a void (*)() function. class fcn_elem : public elem { public: // FIXME: Do we need to apply std::forward to the arguments to // std::bind here? template <typename F, typename... Args> fcn_elem (F&& fcn, Args&& ... args) : m_fcn (std::bind (fcn, args...)) { } void run () { m_fcn (); } private: std::function<void ()> m_fcn; }; // An element that stores arbitrary variable, and restores it. template <typename T> class restore_var_elem : public elem { public: restore_var_elem (T& ref, const T& val) : m_ptr (&ref), m_val (val) { } OCTAVE_DISABLE_CONSTRUCT_COPY_MOVE (restore_var_elem) ~restore_var_elem () = default; void run () { *m_ptr = m_val; } private: T *m_ptr; typename util::atomic_traits<T>::type m_val; }; // Deletes a class allocated using new. template <typename T> class delete_ptr_elem : public elem { public: delete_ptr_elem (T *ptr) : m_ptr (ptr) { } OCTAVE_DISABLE_CONSTRUCT_COPY_MOVE (delete_ptr_elem) ~delete_ptr_elem () = default; void run () { delete m_ptr; } private: T *m_ptr; }; action_container () { } OCTAVE_DISABLE_COPY_MOVE (action_container) virtual ~action_container () = default; template <typename F, typename... Args> void add (F&& fcn, Args&& ... args) { add_action (new fcn_elem (std::forward<F> (fcn), std::forward<Args> (args)...)); } // Use separate template types for function pointer parameter // declarations and captured arguments so that differences in // const are handled properly. template <typename... Params, typename... Args> void add_fcn (void (*fcn) (Params...), Args&& ... args) { add_action (new fcn_elem (fcn, std::forward<Args> (args)...)); } template <typename T, typename... Params, typename... Args> void add_method (T *obj, void (T::*method) (Params...), Args&& ... args) { add_action (new fcn_elem (method, obj, std::forward<Args> (args)...)); } template <typename T, typename... Params, typename... Args> void add_method (T& obj, void (T::*method) (Params...), Args&& ... args) { add_action (new fcn_elem (method, &obj, std::forward<Args> (args)...)); } // Call to delete (T*). template <typename T> void add_delete (T *obj) { add_action (new delete_ptr_elem<T> (obj)); } // Protect any variable. template <typename T> void protect_var (T& var) { add_action (new restore_var_elem<T> (var, var)); } // Protect any variable, value given. template <typename T> void protect_var (T& var, const T& val) { add_action (new restore_var_elem<T> (var, val)); } operator bool () const { return ! empty (); } virtual void run_first () = 0; OCTAVE_API void run (std::size_t num); void run () { run (size ()); } virtual void discard_first () = 0; void discard (std::size_t num) { if (num > size ()) num = size (); for (std::size_t i = 0; i < num; i++) discard_first (); } void discard () { discard (size ()); } virtual std::size_t size () const = 0; bool empty () const { return size () == 0; } protected: virtual void add_action (elem *new_elem) = 0; }; OCTAVE_END_NAMESPACE(octave) #endif