1 | // =============================================================== // |
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2 | // // |
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3 | // File : ScrollSynchronizer.h // |
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4 | // Purpose : synchronize TREE_canvas scrolling // |
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5 | // // |
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6 | // Coded by Ralf Westram (coder@reallysoft.de) in October 2016 // |
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7 | // http://www.arb-home.de/ // |
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8 | // // |
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9 | // =============================================================== // |
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10 | |
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11 | #ifndef SCROLLSYNCHRONIZER_H |
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12 | #define SCROLLSYNCHRONIZER_H |
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13 | |
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14 | #ifndef NT_LOCAL_H |
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15 | #include "NT_local.h" |
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16 | #endif |
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17 | #ifndef SMARTPTR_H |
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18 | #include <smartptr.h> |
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19 | #endif |
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20 | #ifndef _GLIBCXX_SET |
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21 | #include <set> |
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22 | #endif |
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23 | |
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24 | #define NO_SCROLL_SYNC (-1) |
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25 | |
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26 | #if defined(DEBUG) |
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27 | // # define DUMP_SYNC |
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28 | // # define DUMP_SYNC_AUTO // auto-update and source-canvas-change |
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29 | #endif |
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30 | |
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31 | |
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32 | CONSTEXPR_INLINE bool valid_canvas_index(int idx) { return idx>=0 && idx<MAX_NT_WINDOWS; } |
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33 | |
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34 | class timestamp { |
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35 | unsigned t; |
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36 | public: |
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37 | explicit timestamp(unsigned i) : t(i) {} |
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38 | operator unsigned() const { return t; } |
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39 | |
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40 | static timestamp before(const timestamp& t) { return timestamp(t-1); } |
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41 | static timestamp after(const timestamp& t) { return timestamp(t+1); } |
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42 | |
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43 | void setNewerThan(const timestamp& other) { *this = after(other); } |
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44 | void setOlderThan(const timestamp& other) { *this = before(other); } |
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45 | |
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46 | bool newer_than(const timestamp& other) const { return t>other; } |
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47 | bool older_than(const timestamp& other) const { return t<other; } |
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48 | |
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49 | }; |
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50 | |
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51 | typedef std::set< RefPtr<GBDATA> > SpeciesSet; |
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52 | |
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53 | typedef SmartPtr<SpeciesSet> SpeciesSetPtr; |
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54 | |
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55 | inline bool operator == (const SpeciesSetPtr& spec1, const SpeciesSetPtr& spec2) { |
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56 | if (spec1.isNull()) return spec2.isNull() ? true : false; |
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57 | if (spec2.isNull()) return false; |
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58 | if (spec1.sameObject(spec2)) return true; |
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59 | return *spec1 == *spec2; |
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60 | } |
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61 | inline bool operator != (const SpeciesSetPtr& spec1, const SpeciesSetPtr& spec2) { |
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62 | return !(spec1 == spec2); |
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63 | } |
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64 | |
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65 | class CanvasRef { |
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66 | int index; |
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67 | mutable TREE_canvas *canvas; |
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68 | public: |
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69 | CanvasRef() : |
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70 | index(-1), |
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71 | canvas(NULp) |
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72 | {} |
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73 | |
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74 | void define_canvas_index(int i) { |
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75 | nt_assert(index == -1); |
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76 | nt_assert(valid_canvas_index(i)); |
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77 | |
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78 | index = i; |
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79 | } |
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80 | |
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81 | int get_index() const { |
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82 | nt_assert(valid_canvas_index(index)); |
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83 | return index; |
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84 | } |
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85 | TREE_canvas *get_canvas() const { |
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86 | if (!canvas) { |
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87 | canvas = NT_get_canvas_by_index(get_index()); |
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88 | nt_assert(canvas); |
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89 | } |
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90 | return canvas; |
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91 | } |
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92 | }; |
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93 | |
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94 | class MasterCanvas : public CanvasRef { |
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95 | timestamp last_Refresh; // passive (last refresh of canvas) |
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96 | timestamp last_DisplayTrack; // last tracking of displayed species (=last update of species-set; probably w/o change) |
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97 | timestamp last_SetChange; // last CHANGE of species-set |
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98 | |
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99 | SpeciesSetPtr species; |
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100 | |
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101 | SpeciesSetPtr track_displayed_species(); |
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102 | |
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103 | void update_SpeciesSet() { |
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104 | if (last_Refresh.newer_than(last_SetChange)) { |
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105 | |
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106 | if (last_Refresh.newer_than(last_DisplayTrack)) { |
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107 | SpeciesSetPtr current_species = track_displayed_species(); |
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108 | last_DisplayTrack = last_Refresh; |
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109 | #if defined(DUMP_SYNC) |
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110 | fprintf(stderr, "DEBUG: MasterCanvas tracking species (idx=%i, last_DisplayTrack=%u, species count=%zu)\n", get_index(), unsigned(last_DisplayTrack), current_species->size()); |
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111 | #endif |
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112 | |
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113 | if (species != current_species) { // set of species changed? |
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114 | species = current_species; |
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115 | last_SetChange = last_DisplayTrack; |
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116 | #if defined(DUMP_SYNC) |
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117 | fprintf(stderr, " MasterCanvas::SpeciesSet changed/updated (last_SetChange=%u)\n", unsigned(last_SetChange)); |
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118 | #endif |
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119 | } |
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120 | #if defined(DUMP_SYNC) |
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121 | else { |
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122 | fputs(" MasterCanvas::SpeciesSet did not change\n", stderr); |
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123 | } |
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124 | #endif |
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125 | } |
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126 | } |
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127 | } |
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128 | |
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129 | public: |
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130 | MasterCanvas() : |
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131 | last_Refresh(8), |
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132 | last_DisplayTrack(7), |
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133 | last_SetChange(6) |
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134 | {} |
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135 | |
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136 | void announce_update() { last_Refresh.setNewerThan(last_DisplayTrack); } |
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137 | |
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138 | const timestamp& get_updated_SpeciesSet(SpeciesSetPtr& specset) { |
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139 | update_SpeciesSet(); |
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140 | specset = species; |
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141 | return last_SetChange; |
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142 | } |
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143 | }; |
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144 | |
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145 | class SlaveCanvas_internal; |
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146 | |
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147 | class SlaveCanvas : public CanvasRef, virtual Noncopyable { |
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148 | |
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149 | RefPtr<MasterCanvas> last_master; |
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150 | timestamp last_master_change; |
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151 | |
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152 | bool need_SetUpdate; |
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153 | bool need_PositionTrack; |
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154 | bool need_ScrollZoom; |
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155 | bool need_Refresh; |
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156 | |
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157 | SpeciesSetPtr species; |
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158 | SlaveCanvas_internal *internal; |
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159 | |
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160 | void track_display_positions(); |
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161 | void calc_scroll_zoom(); |
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162 | |
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163 | void update_set_from_master(MasterCanvas& master) { |
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164 | bool update_only_if_master_changed = false; |
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165 | |
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166 | if (!need_SetUpdate) { |
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167 | if (!last_master) need_SetUpdate = true; |
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168 | else if (last_master != &master) need_SetUpdate = true; |
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169 | else update_only_if_master_changed = true; |
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170 | } |
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171 | |
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172 | if (need_SetUpdate || update_only_if_master_changed) { |
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173 | SpeciesSetPtr master_spec; |
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174 | timestamp master_stamp = master.get_updated_SpeciesSet(master_spec); |
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175 | |
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176 | if (update_only_if_master_changed && !need_SetUpdate) { |
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177 | need_SetUpdate = master_stamp.newer_than(last_master_change); |
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178 | } |
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179 | if (need_SetUpdate) { |
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180 | last_master = &master; |
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181 | last_master_change = master_stamp; |
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182 | |
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183 | if (master_spec != species) { |
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184 | species = master_spec; |
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185 | need_PositionTrack = true; |
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186 | |
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187 | #if defined(DUMP_SYNC) |
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188 | fprintf(stderr, "DEBUG: updating SlaveCanvas::SpeciesSet (idx=%i, species count=%zu)\n", get_index(), species->size()); |
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189 | #endif |
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190 | } |
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191 | need_SetUpdate = false; |
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192 | } |
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193 | } |
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194 | } |
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195 | |
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196 | void update_tracked_positions() { |
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197 | nt_assert(!need_SetUpdate); |
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198 | if (need_PositionTrack) { |
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199 | #if defined(DUMP_SYNC) |
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200 | fprintf(stderr, "DEBUG: SlaveCanvas tracks positions (idx=%i)\n", get_index()); |
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201 | #endif |
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202 | track_display_positions(); |
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203 | need_ScrollZoom = true; |
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204 | need_PositionTrack = false; |
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205 | } |
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206 | } |
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207 | void update_scroll_zoom() { |
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208 | nt_assert(!need_PositionTrack); |
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209 | if (need_ScrollZoom) { |
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210 | #if defined(DUMP_SYNC) |
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211 | fprintf(stderr, "DEBUG: SlaveCanvas updates scroll/zoom (idx=%i)\n", get_index()); |
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212 | #endif |
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213 | calc_scroll_zoom(); |
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214 | need_Refresh = true; |
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215 | need_ScrollZoom = false; |
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216 | } |
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217 | } |
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218 | |
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219 | void refresh_scroll_zoom(); |
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220 | |
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221 | public: |
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222 | SlaveCanvas(); |
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223 | ~SlaveCanvas(); |
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224 | |
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225 | void request_Refresh() { |
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226 | need_Refresh = true; |
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227 | } |
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228 | void request_SetUpdate() { |
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229 | need_SetUpdate = true; |
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230 | } |
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231 | |
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232 | void refresh_if_needed(MasterCanvas& master) { |
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233 | update_set_from_master(master); |
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234 | update_tracked_positions(); |
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235 | update_scroll_zoom(); |
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236 | |
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237 | nt_assert(!need_ScrollZoom); |
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238 | if (need_Refresh) { |
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239 | refresh_scroll_zoom(); |
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240 | need_Refresh = false; |
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241 | } |
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242 | } |
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243 | }; |
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244 | |
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245 | |
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246 | |
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247 | class ScrollSynchronizer { |
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248 | MasterCanvas source[MAX_NT_WINDOWS]; |
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249 | SlaveCanvas dest[MAX_NT_WINDOWS]; |
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250 | |
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251 | int master_index[MAX_NT_WINDOWS]; // index = slave-canvas |
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252 | bool autosynced[MAX_NT_WINDOWS]; // true if canvas is autosynced |
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253 | |
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254 | bool autosynced_with(int canvas, int with) const { |
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255 | nt_assert(valid_canvas_index(canvas)); |
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256 | nt_assert(valid_canvas_index(with)); |
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257 | |
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258 | if (autosynced[canvas]) { |
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259 | int master = master_index[canvas]; |
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260 | if (master == with) return true; |
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261 | if (valid_canvas_index(master)) return autosynced_with(master, with); |
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262 | } |
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263 | return false; |
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264 | } |
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265 | |
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266 | int autosync_master(int slave) const { |
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267 | return autosynced[slave] ? master_index[slave] : NO_SCROLL_SYNC; |
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268 | } |
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269 | |
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270 | public: |
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271 | ScrollSynchronizer() { |
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272 | for (int i = 0; i<MAX_NT_WINDOWS; ++i) { |
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273 | source[i].define_canvas_index(i); |
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274 | dest[i].define_canvas_index(i); |
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275 | } |
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276 | } |
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277 | |
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278 | GB_ERROR define_dependency(int slave_idx, int master_idx, bool auto_sync) { |
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279 | /*! defines master/slave dependency between TREE_canvas'es |
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280 | * @param slave_idx index of slave canvas [0..MAX_NT_WINDOWS-1] |
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281 | * @param master_idx index of master canvas (or NO_SCROLL_SYNC) |
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282 | * @param auto_sync true -> automatically synchronize scrolling |
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283 | * @return error (only if auto_sync is impossible because of sync-loop => auto_sync is ignored!) |
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284 | */ |
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285 | |
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286 | nt_assert(valid_canvas_index(slave_idx)); |
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287 | nt_assert(valid_canvas_index(master_idx) || master_idx == NO_SCROLL_SYNC); |
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288 | |
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289 | master_index[slave_idx] = master_idx; |
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290 | autosynced[slave_idx] = false; |
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291 | |
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292 | GB_ERROR error = NULp; |
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293 | if (auto_sync && master_idx != NO_SCROLL_SYNC) { |
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294 | if (autosynced_with(master_idx, slave_idx)) { |
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295 | error = "dependency loop detected"; |
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296 | } |
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297 | else { |
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298 | autosynced[slave_idx] = true; |
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299 | } |
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300 | } |
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301 | return error; |
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302 | } |
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303 | |
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304 | void announce_update(int canvas_idx) { |
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305 | nt_assert(valid_canvas_index(canvas_idx)); |
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306 | source[canvas_idx].announce_update(); |
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307 | #if defined(DUMP_SYNC_AUTO) |
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308 | fprintf(stderr, "DEBUG: announce_update(canvas_idx=%i)\n", canvas_idx); |
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309 | #endif |
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310 | } |
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311 | |
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312 | // @@@ add announce_resize (master AND slave!) |
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313 | // @@@ add announce_tree_modified (master AND slave!); shall also handle change to other tree |
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314 | // @@@ add announce_tree_type_changed (master AND slave!) |
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315 | |
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316 | GB_ERROR update_explicit(int slave_idx) { |
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317 | /*! perform an unconditional update |
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318 | * (ie. refresh of slave is forced even if internal data was up-to-date) |
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319 | * @param slave_idx index of canvas to update |
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320 | * @return error (eg. if no master defined) |
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321 | */ |
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322 | |
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323 | int master_idx = master_index[slave_idx]; |
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324 | |
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325 | GB_ERROR error = NULp; |
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326 | if (valid_canvas_index(master_idx)) { |
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327 | #if defined(DUMP_SYNC) |
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328 | fputs("------------------------------\n", stderr); |
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329 | fprintf(stderr, "DEBUG: update_explicit(slave_idx=%i) from master_idx=%i\n", slave_idx, master_idx); |
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330 | #endif |
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331 | MasterCanvas& master = source[master_idx]; |
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332 | SlaveCanvas& slave = dest[slave_idx]; |
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333 | |
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334 | slave.request_Refresh(); |
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335 | slave.refresh_if_needed(master); |
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336 | } |
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337 | else { |
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338 | error = "No master-window defined"; |
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339 | } |
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340 | return error; |
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341 | } |
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342 | |
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343 | void update_implicit(int slave_idx) { |
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344 | /*! perform an implicit update |
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345 | * |
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346 | * @param slave_idx index of canvas to update |
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347 | * @return error (eg. if no master defined) |
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348 | */ |
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349 | |
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350 | int master_idx = master_index[slave_idx]; |
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351 | if (valid_canvas_index(master_idx)) { |
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352 | #if defined(DUMP_SYNC) |
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353 | fputs("------------------------------\n", stderr); |
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354 | fprintf(stderr, "DEBUG: update_implicit(slave_idx=%i) from master_idx=%i\n", slave_idx, master_idx); |
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355 | #endif |
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356 | MasterCanvas& master = source[master_idx]; |
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357 | SlaveCanvas& slave = dest[slave_idx]; |
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358 | |
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359 | slave.request_SetUpdate(); |
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360 | slave.refresh_if_needed(master); |
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361 | } |
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362 | } |
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363 | |
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364 | void auto_update() { |
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365 | /*! update all auto-synchronized canvases */ |
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366 | |
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367 | #if defined(DUMP_SYNC_AUTO) |
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368 | fputs("------------------------------\n" |
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369 | "DEBUG: auto_update\n", stderr); |
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370 | #endif |
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371 | |
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372 | bool check_update[MAX_NT_WINDOWS]; |
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373 | for (int i = 0; i<MAX_NT_WINDOWS; ++i) { |
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374 | check_update[i] = autosynced[i]; |
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375 | } |
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376 | |
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377 | bool need_check = true; |
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378 | while (need_check) { |
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379 | need_check = false; |
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380 | |
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381 | for (int slave_idx = 0; slave_idx<MAX_NT_WINDOWS; ++slave_idx) { |
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382 | if (check_update[slave_idx]) { |
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383 | int master_idx = autosync_master(slave_idx); |
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384 | if (valid_canvas_index(master_idx)) { |
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385 | if (check_update[master_idx]) { |
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386 | // delay (first update master) |
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387 | need_check = true; // need another loop |
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388 | } |
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389 | else { |
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390 | #if defined(DUMP_SYNC_AUTO) |
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391 | fprintf(stderr, "DEBUG: auto_update(slave_idx=%i) from master_idx=%i\n", slave_idx, master_idx); |
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392 | #endif |
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393 | MasterCanvas& master = source[master_idx]; |
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394 | SlaveCanvas& slave = dest[slave_idx]; |
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395 | |
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396 | slave.refresh_if_needed(master); |
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397 | |
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398 | check_update[slave_idx] = false; |
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399 | } |
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400 | } |
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401 | } |
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402 | } |
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403 | } |
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404 | } |
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405 | }; |
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406 | |
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407 | |
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408 | #else |
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409 | #error ScrollSynchronizer.h included twice |
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410 | #endif // SCROLLSYNCHRONIZER_H |
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