The Battle for Wesnoth  1.19.0+dev
help_menu.hpp
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1 /*
2  Copyright (C) 2003 - 2024
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, int level);
55  visible_item(const topic *_t, int level);
56  // Invariant, one if these should be nullptr. The constructors
57  // enforce it.
58  const topic *t;
59  const section *sec;
60  gui::indented_menu_item get_menu_item(const help_menu& parent) const;
61  /** Indentation level, always one more than the parent section. */
62  int level;
63  bool operator==(const visible_item &sec) const;
64  bool operator==(const section &sec) const;
65  bool operator==(const topic &t) const;
66  };
67 
68  /** Regenerate what items are visible by checking what sections are expanded. */
69  void update_visible_items(const section &top_level, unsigned starting_level=0);
70 
71  /** Return true if the section is expanded. */
72  bool expanded(const section &sec) const;
73 
74  /** Mark a section as expanded. Do not update the visible items or anything. */
75  void expand(const section &sec);
76 
77  /**
78  * Contract (close) a section. That is, mark it as not expanded,
79  * visible items are not updated.
80  */
81  void contract(const section &sec);
82 
83  /**
84  * Return the string to use as the prefix for the icon part of the
85  * menu-string at the specified level.
86  */
87  std::string indent_list(const std::string &icon, const unsigned level);
88  /** Return the data to use with the superclass's set_items() for sections at the specified level. */
90  /** Return the data to use with the superclass's set_items() for topics at the specified level. */
92 
93  /** Draw the currently visible items. */
94  void display_visible_items();
95 
96  /**
97  * Internal recursive thingie. did_expand will be true if any
98  * section was expanded, otherwise untouched.
99  */
100  bool select_topic_internal(const topic &t, const section &sec);
101 
102  std::vector<visible_item> visible_items_;
104  std::set<const section*> expanded_;
107 };
108 
109 } // end namespace help
double t
Definition: astarsearch.cpp:63
Superclass of the help_menu, which displays the left-hand pane of the GUI1 help browser.
Definition: menu.hpp:46
The menu to the left in the help browser, where topics can be navigated through and chosen.
Definition: help_menu.hpp:33
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:63
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.
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:104
void expand(const section &sec)
Mark a section as expanded.
Definition: help_menu.cpp:49
topic const * chosen_topic_
Definition: help_menu.hpp:105
bool expanded(const section &sec) const
Return true if the section is expanded.
Definition: help_menu.cpp:44
const section & toplevel_
Definition: help_menu.hpp:103
std::set< const section * > expanded_
Definition: help_menu.hpp:104
bool select_topic_internal(const topic &t, const section &sec)
Internal recursive thingie.
Definition: help_menu.cpp:84
gui::indented_menu_item get_item_to_show(const topic &topic, const unsigned level)
Return the data to use with the superclass's set_items() for topics at the specified level.
const topic * chosen_topic()
If a topic has been chosen, return that topic, otherwise nullptr.
Definition: help_menu.cpp:158
std::vector< visible_item > visible_items_
Definition: help_menu.hpp:102
gui::indented_menu_item get_item_to_show(const section &sec, const unsigned level)
Return the data to use with the superclass's set_items() for sections at the specified level.
help_menu(const section &toplevel, int max_height=-1)
Definition: help_menu.cpp:29
void contract(const section &sec)
Contract (close) a section.
Definition: help_menu.cpp:56
void display_visible_items()
Draw the currently visible items.
Definition: help_menu.cpp:165
visible_item selected_item_
Definition: help_menu.hpp:106
Definition: help.cpp:53
The only kind of row still supported by the menu class.
Definition: menu.hpp:33
Information about an item that is visible in the menu.
Definition: help_menu.hpp:53
visible_item(const section *_sec, int level)
Definition: help_menu.cpp:178
gui::indented_menu_item get_menu_item(const help_menu &parent) const
Definition: help_menu.cpp:184
int level
Indentation level, always one more than the parent section.
Definition: help_menu.hpp:62
bool operator==(const visible_item &sec) const
Definition: help_menu.cpp:205
A section contains topics and sections along with title and ID.
Definition: help_impl.hpp:145
A topic contains a title, an id and some text.
Definition: help_impl.hpp:112