The Battle for Wesnoth  1.17.10+dev
help_menu.hpp
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1 /*
2  Copyright (C) 2003 - 2022
3  by David White <dave@whitevine.net>
4  Part of the Battle for Wesnoth Project https://www.wesnoth.org/
5 
6  This program is free software; you can redistribute it and/or modify
7  it under the terms of the GNU General Public License as published by
8  the Free Software Foundation; either version 2 of the License, or
9  (at your option) any later version.
10  This program is distributed in the hope that it will be useful,
11  but WITHOUT ANY WARRANTY.
12 
13  See the COPYING file for more details.
14 */
15 
16 #pragma once
17 
18 #include <set> // for set
19 #include <string> // for string, basic_string
20 #include <vector> // for vector
21 #include "widgets/menu.hpp" // for menu
22 
23 namespace help { struct section; }
24 namespace help { struct topic; }
25 
26 namespace help {
27 
28 /**
29  * The menu to the left in the help browser, where topics can be
30  * navigated through and chosen.
31  */
32 class help_menu : public gui::menu
33 {
34 public:
35  help_menu(const section &toplevel, int max_height=-1);
36  int process();
37 
38  /**
39  * Make the topic the currently selected one, and expand all
40  * sections that need to be expanded to show it.
41  */
42  void select_topic(const topic &t);
43 
44  /**
45  * If a topic has been chosen, return that topic, otherwise
46  * nullptr. If one topic is returned, it will not be returned again,
47  * if it is not re-chosen.
48  */
49  const topic *chosen_topic();
50 
51 private:
52  /** Information about an item that is visible in the menu. */
53  struct visible_item {
54  visible_item(const section *_sec, const std::string &visible_string, int level);
55  visible_item(const topic *_t, const std::string &visible_string, int level);
56  // Invariant, one if these should be nullptr. The constructors
57  // enforce it.
58  const topic *t;
59  const section *sec;
60  std::string visible_string;
61  int level;
62  bool operator==(const visible_item &vis_item) const;
63  bool operator==(const section &sec) const;
64  bool operator==(const topic &t) const;
65  };
66 
67  /** Regenerate what items are visible by checking what sections are expanded. */
68  void update_visible_items(const section &top_level, unsigned starting_level=0);
69 
70  /** Return true if the section is expanded. */
71  bool expanded(const section &sec);
72 
73  /** Mark a section as expanded. Do not update the visible items or anything. */
74  void expand(const section &sec);
75 
76  /**
77  * Contract (close) a section. That is, mark it as not expanded,
78  * visible items are not updated.
79  */
80  void contract(const section &sec);
81 
82  /**
83  * Return the string to use as the prefix for the icon part of the
84  * menu-string at the specified level.
85  */
86  std::string indent_list(const std::string &icon, const unsigned level);
87  /** Return the string to use as the menu-string for sections at the specified level. */
88  std::string get_string_to_show(const section &sec, const unsigned level);
89  /** Return the string to use as the menu-string for topics at the specified level. */
90  std::string get_string_to_show(const topic &topic, const unsigned level);
91 
92  /** Draw the currently visible items. */
93  void display_visible_items();
94 
95  /**
96  * Internal recursive thingie. did_expand will be true if any
97  * section was expanded, otherwise untouched.
98  */
99  bool select_topic_internal(const topic &t, const section &sec);
100 
101  std::vector<visible_item> visible_items_;
103  std::set<const section*> expanded_;
106 };
107 
108 } // end namespace help
void contract(const section &sec)
Contract (close) a section.
Definition: help_menu.cpp:58
std::string get_string_to_show(const section &sec, const unsigned level)
Return the string to use as the menu-string for sections at the specified level.
Definition: help_menu.cpp:98
visible_item selected_item_
Definition: help_menu.hpp:105
topic const * chosen_topic_
Definition: help_menu.hpp:104
A section contains topics and sections along with title and ID.
Definition: help_impl.hpp:146
bool expanded(const section &sec)
Return true if the section is expanded.
Definition: help_menu.cpp:46
visible_item(const section *_sec, const std::string &visible_string, int level)
Definition: help_menu.cpp:216
void display_visible_items()
Draw the currently visible items.
Definition: help_menu.cpp:203
const section & toplevel_
Definition: help_menu.hpp:102
std::string indent_list(const std::string &icon, const unsigned level)
Return the string to use as the prefix for the icon part of the menu-string at the specified level...
Definition: help_menu.cpp:88
help_menu(const section &toplevel, int max_height=-1)
Definition: help_menu.cpp:31
Information about an item that is visible in the menu.
Definition: help_menu.hpp:53
void expand(const section &sec)
Mark a section as expanded.
Definition: help_menu.cpp:51
std::set< const section * > expanded_
Definition: help_menu.hpp:103
std::vector< visible_item > visible_items_
Definition: help_menu.hpp:101
bool operator==(const visible_item &vis_item) const
Definition: help_menu.cpp:232
void select_topic(const topic &t)
Make the topic the currently selected one, and expand all sections that need to be expanded to show i...
Definition: help_menu.cpp:134
double t
Definition: astarsearch.cpp:65
The menu to the left in the help browser, where topics can be navigated through and chosen...
Definition: help_menu.hpp:32
A topic contains a title, an id and some text.
Definition: help_impl.hpp:112
void update_visible_items(const section &top_level, unsigned starting_level=0)
Regenerate what items are visible by checking what sections are expanded.
Definition: help_menu.cpp:65
const topic * chosen_topic()
If a topic has been chosen, return that topic, otherwise nullptr.
Definition: help_menu.cpp:196
Definition: help.cpp:57
bool select_topic_internal(const topic &t, const section &sec)
Internal recursive thingie.
Definition: help_menu.cpp:114