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1 #include "stdafx.h"
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2 #include <vector>
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3
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4 namespace { // anon namespace everything, it's not accessible by means other than the service factory
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5
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6 // The command ID.
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7 // Generate a new GUID when reusing code.
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8 static const GUID guid_menucommand = { 0xab754b0b, 0x204, 0x4471, { 0xb5, 0x29, 0xff, 0x73, 0xae, 0x51, 0x5d, 0xe9 } };
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9
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10 // Shared with mainmenu.cpp
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11 static const GUID guid_mainmenu_group_id = { 0x44963e7a, 0x4b2a, 0x4588, { 0xb0, 0x17, 0xa8, 0x69, 0x18, 0xcb, 0x8a, 0xa5 } };
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12
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13 class sample_command : public mainmenu_node_command {
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14 public:
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15 sample_command( size_t index ) : m_index(index) {
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16 }
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17 void get_display(pfc::string_base & text, t_uint32 & flags) override {
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18 flags = 0;
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19 text = PFC_string_formatter() << "Test dynamic item #" << m_index;
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20 }
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21 void execute(service_ptr_t<service_base> callback) override {
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22 popup_message::g_show(PFC_string_formatter() << "Invoked test menu item #" << m_index, "Information");
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23 }
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24 GUID get_guid() override {
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25 // This method returns our subcommand ID.
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26 // Dynamic commands are identified by a pair of GUIDs:
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27 // - command ID ( see: mainmenu_commands interface )
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28 // - subcommand ID ( identifier of one of the dynamic items )
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29 // Subcommand identifiers don't have to be actually globally unique,
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30 // as long as they're unique among the subcommand identifiers for this command ID.
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31
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32 // In our case, we'll just create a makeshift GUID from a hash of the index.
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33 // This is perfectly okay for production code - as long as your command ID is a proper GUID!
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34
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35 // Don't ever hash size_t which varies with CPU architecture
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36 // Integer endianness intentionally disregarded
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37 uint32_t hashme = (uint32_t) m_index;
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38
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39 auto api = hasher_md5::get();
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40 hasher_md5_state state;
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41 api->initialize( state );
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42 api->process( state, &hashme, sizeof(hashme) );
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43
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44 // fb2k hasher_md5 API even provides a convenient method to return MD5 hashes cast to GUIDs for this.
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45 return api->get_result_guid( state );
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46 }
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47 bool get_description(pfc::string_base & out) override {
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48 out = PFC_string_formatter() << "This is a test menu item #" << m_index << ".";
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49 return true;
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50 }
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51 private:
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52 const size_t m_index;
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53 };
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54 class sample_group : public mainmenu_node_group {
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55 public:
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56 sample_group() {
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57 m_children.resize(11);
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58 for( size_t walk = 0; walk < m_children.size(); ++ walk ) {
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59 mainmenu_node::ptr node;
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60 // Insert separators for odd items, commands for even
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61 if ( walk % 2 ) {
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62 node = fb2k::service_new<mainmenu_node_separator>();
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63 } else {
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64 auto cmdIndex = walk/2 + 1;
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65 node = fb2k::service_new<sample_command>( cmdIndex );
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66 }
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67 m_children[walk] = std::move(node);
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68 }
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69 }
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70 void get_display(pfc::string_base & text, t_uint32 & flags) override {
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71 flags = 0;
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72 text = "Dynamic menu test group";
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73 }
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74 t_size get_children_count() override {
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75 return m_children.size();
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76 }
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77 mainmenu_node::ptr get_child(t_size index) override {
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78 PFC_ASSERT( index < m_children.size() );
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79 return m_children[index];
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80 }
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81 private:
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82 std::vector<mainmenu_node::ptr> m_children;
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83
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84 };
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85
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86 class mainmenu_sample_dynamic : public mainmenu_commands_v2 {
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87 typedef mainmenu_commands_v2 super_t;
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88 public:
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89 // mainmenu_commands_v2 methods
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90 t_uint32 get_command_count() override { return 1; }
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91 GUID get_command(t_uint32 p_index) override {return guid_menucommand;}
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92 void get_name(t_uint32 p_index,pfc::string_base & p_out) override {p_out = "Dynamic menu test";}
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93
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94 bool get_description(t_uint32 p_index,pfc::string_base & p_out) override {
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95 // Should not get here much
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96 p_out = "This is a dynamic menu command test.";
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97 return true;
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98 }
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99 GUID get_parent() override {return guid_mainmenu_group_id; }
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100 void execute(t_uint32 p_index,service_ptr_t<service_base> p_callback) override {
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101 // Should not get here, someone not aware of our dynamic status tried to invoke us?
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102 }
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103
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104 bool is_command_dynamic(t_uint32 index) override { return true; }
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105 mainmenu_node::ptr dynamic_instantiate(t_uint32 index) override {
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106 return fb2k::service_new<sample_group>();
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107 }
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108
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109 bool dynamic_execute(t_uint32 index, const GUID & subID, service_ptr_t<service_base> callback) override {
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110 // If your component provides a more efficient way to execute the command,
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111 // than doing full dynamic_instantiate() and walking all the dynamic items to find one with the matching identifier,
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112 // please implement it here.
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113
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114 // ... or just skip implementing this method entirely.
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115 return super_t::dynamic_execute( index, subID, callback );
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116 }
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117 };
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118
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119 static service_factory_single_t<mainmenu_sample_dynamic> g_mainmenu_sample_dynamic;
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120
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121 } // namespace
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