1 | // =============================================================== // |
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2 | // // |
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3 | // File : AW_device_click.cxx // |
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4 | // Purpose : Detect which graphical element is "nearby" // |
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5 | // a given mouse position // |
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6 | // // |
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7 | // Institute of Microbiology (Technical University Munich) // |
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8 | // http://www.arb-home.de/ // |
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9 | // // |
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10 | // =============================================================== // |
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11 | |
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12 | #include "aw_common.hxx" |
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13 | #include "aw_device_click.hxx" |
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14 | #include <algorithm> |
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15 | |
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16 | using namespace AW; |
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17 | |
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18 | // ------------------------ |
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19 | // AW_device_click |
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20 | |
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21 | AW_device_click::AW_device_click(AW_common *common_) |
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22 | : AW_simple_device(common_) { |
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23 | init_click(0, 0, AWT_NO_CATCH, AW_ALL_DEVICES); |
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24 | } |
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25 | |
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26 | void AW_device_click::init_click(AW_pos mousex, AW_pos mousey, int max_distance, AW_bitset filteri) { |
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27 | mouse_x = mousex; |
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28 | mouse_y = mousey; |
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29 | |
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30 | filter = filteri; |
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31 | |
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32 | max_distance_line = max_distance; |
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33 | max_distance_text = max_distance; |
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34 | |
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35 | opt_line.clear(); |
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36 | opt_text.clear(); |
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37 | } |
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38 | |
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39 | AW_DEVICE_TYPE AW_device_click::type() { |
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40 | return AW_DEVICE_CLICK; |
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41 | } |
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42 | |
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43 | bool AW_device_click::line_impl(int /*gc*/, const AW::LineVector& Line, AW_bitset filteri) { |
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44 | if (!(filteri & filter)) return false; // motif-only |
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45 | |
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46 | LineVector transLine = transform(Line); |
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47 | LineVector clippedLine; |
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48 | bool drawflag = clip(transLine, clippedLine); |
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49 | if (drawflag) { |
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50 | Position mouse(mouse_x, mouse_y); |
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51 | double nearest_rel_pos; |
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52 | Position nearest = nearest_linepoint(mouse, clippedLine, nearest_rel_pos); |
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53 | double distance = Distance(mouse, nearest); |
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54 | |
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55 | if (distance < max_distance_line) { |
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56 | max_distance_line = distance; |
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57 | |
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58 | opt_line.x0 = Line.xpos(); |
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59 | opt_line.y0 = Line.ypos(); |
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60 | opt_line.x1 = Line.head().xpos(); |
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61 | opt_line.y1 = Line.head().ypos(); |
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62 | |
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63 | opt_line.distance = distance; |
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64 | opt_line.set_rel_pos(nearest_rel_pos); |
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65 | |
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66 | opt_line.copy_cds(click_cd); |
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67 | opt_line.exists = true; |
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68 | } |
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69 | } |
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70 | return drawflag; |
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71 | } |
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72 | |
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73 | |
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74 | bool AW_device_click::text_impl(int gc, const char *str, const AW::Position& pos, AW_pos alignment, AW_bitset filteri, long opt_strlen) { |
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75 | if (!(filteri & filter)) return false; // motif only - gtk should |
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76 | |
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77 | AW_pos X0, Y0; // Transformed pos |
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78 | this->transform(pos.xpos(), pos.ypos(), X0, Y0); |
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79 | |
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80 | const AW_GC *gcm = get_common()->map_gc(gc); |
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81 | const AW_font_limits& font_limits = gcm->get_font_limits(); |
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82 | |
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83 | AW_pos Y1 = Y0+font_limits.descent; |
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84 | Y0 = Y0-font_limits.ascent; |
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85 | |
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86 | // Fast check text against top/bottom clip |
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87 | const AW_screen_area& clipRect = get_cliprect(); |
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88 | if (clipRect.t == 0) { |
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89 | if (Y1 < clipRect.t) return false; |
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90 | } |
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91 | else { |
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92 | if (Y0 < clipRect.t) return false; |
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93 | } |
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94 | |
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95 | if (clipRect.b == get_common()->get_screen().b) { |
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96 | if (Y0 > clipRect.b) return false; |
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97 | } |
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98 | else { |
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99 | if (Y1 > clipRect.b) return false; |
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100 | } |
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101 | |
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102 | // vertical check mouse against textsurrounding |
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103 | bool exact = true; |
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104 | int dist2text = 0; // exact hit -> distance == 0 |
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105 | |
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106 | // vertical check against textborders |
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107 | if (mouse_y > Y1) { // above text |
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108 | int ydist = mouse_y-Y1; |
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109 | if (ydist > max_distance_text) return false; // too far above |
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110 | exact = false; |
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111 | dist2text = ydist; |
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112 | } |
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113 | else if (mouse_y < Y0) { // below text |
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114 | int ydist = Y0-mouse_y; |
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115 | if (ydist > max_distance_text) return false; // too far below |
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116 | exact = false; |
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117 | dist2text = ydist; |
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118 | } |
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119 | |
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120 | // align text |
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121 | int len = opt_strlen ? opt_strlen : strlen(str); |
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122 | int text_width = (int)get_string_size(gc, str, len); |
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123 | |
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124 | X0 = x_alignment(X0, text_width, alignment); |
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125 | AW_pos X1 = X0+text_width; |
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126 | |
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127 | // check against left/right clipping areas |
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128 | if (X1 < clipRect.l) return false; |
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129 | if (X0 > clipRect.r) return false; |
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130 | |
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131 | // horizontal check against textborders |
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132 | if (mouse_x > X1) { // right of text |
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133 | int xdist = mouse_x-X1; |
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134 | if (xdist > max_distance_text) return false; // too far right |
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135 | exact = false; |
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136 | dist2text = std::max(xdist, dist2text); |
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137 | } |
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138 | else if (mouse_x < X0) { // left of text |
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139 | int xdist = X0-mouse_x; |
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140 | if (xdist > max_distance_text) return false; // too far left |
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141 | exact = false; |
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142 | dist2text = std::max(xdist, dist2text); |
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143 | } |
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144 | |
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145 | max_distance_text = dist2text; // exact hit -> distance = 0 |
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146 | |
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147 | int position = -1; // invalid (if not exact) |
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148 | if (exact) { |
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149 | if (font_limits.is_monospaced()) { |
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150 | short letter_width = font_limits.width; |
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151 | position = (int)((mouse_x-X0)/letter_width); |
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152 | if (position<0) position = 0; |
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153 | if (position>(len-1)) position = len-1; |
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154 | } |
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155 | else { // proportional font |
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156 | position = 0; |
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157 | int tmp_offset = 0; |
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158 | while (position<=len) { |
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159 | tmp_offset += gcm->get_width_of_char(str[position]); |
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160 | if (mouse_x <= X0+tmp_offset) break; |
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161 | position++; |
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162 | } |
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163 | } |
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164 | } |
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165 | |
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166 | if (!opt_text.exists || // first candidate |
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167 | (!opt_text.exactHit && exact) || // previous candidate was no exact hit |
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168 | (opt_text.distance>dist2text)) // previous candidate had greater distance to click |
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169 | { |
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170 | Rectangle textArea(LineVector(X0, Y0, X1, Y1)); |
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171 | |
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172 | LineVector orientation = textArea.bigger_extent(); |
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173 | LineVector clippedOrientation; |
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174 | |
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175 | bool visible = clip(orientation, clippedOrientation); |
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176 | if (visible) { |
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177 | Position mouse(mouse_x, mouse_y); |
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178 | double nearest_rel_pos; |
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179 | Position nearest = nearest_linepoint(mouse, clippedOrientation, nearest_rel_pos); |
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180 | |
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181 | opt_text.textArea = rtransform(textArea); |
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182 | opt_text.set_rel_pos(nearest_rel_pos); |
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183 | opt_text.cursor = position; |
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184 | |
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185 | opt_text.distance = max_distance_text; |
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186 | opt_text.exactHit = exact; |
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187 | |
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188 | opt_text.copy_cds(click_cd); |
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189 | opt_text.exists = true; |
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190 | } |
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191 | } |
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192 | return true; |
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193 | } |
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194 | |
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195 | |
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196 | void AW_device_click::get_clicked_line(AW_clicked_line *ptr) const { |
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197 | *ptr = opt_line; |
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198 | } |
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199 | |
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200 | |
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201 | void AW_device_click::get_clicked_text(AW_clicked_text *ptr) const { |
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202 | *ptr = opt_text; |
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203 | } |
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204 | |
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205 | int AW_clicked_line::indicate_selected(AW_device *d, int gc) const { |
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206 | return d->line(gc, x0, y0, x1, y1); |
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207 | } |
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208 | int AW_clicked_text::indicate_selected(AW_device *d, int gc) const { |
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209 | return d->box(gc, true, textArea); |
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210 | } |
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211 | |
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