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1 /* |
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2 SDL - Simple DirectMedia Layer |
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3 Copyright (C) 1997-2006 Sam Lantinga |
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4 |
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5 This library is free software; you can redistribute it and/or |
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6 modify it under the terms of the GNU Lesser General Public |
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7 License as published by the Free Software Foundation; either |
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8 version 2.1 of the License, or (at your option) any later version. |
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9 |
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10 This library is distributed in the hope that it will be useful, |
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 Lesser General Public License for more details. |
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14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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18 |
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19 Sam Lantinga |
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20 slouken@libsdl.org |
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21 */ |
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22 #include "SDL_config.h" |
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23 |
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24 /* General mouse handling code for SDL */ |
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25 |
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26 #include "SDL_events.h" |
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27 #include "SDL_events_c.h" |
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28 #include "../video/SDL_cursor_c.h" |
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29 #include "../video/SDL_sysvideo.h" |
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30 |
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31 |
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32 /* These are static for our mouse handling code */ |
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33 static Sint16 SDL_MouseX = 0; |
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34 static Sint16 SDL_MouseY = 0; |
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35 static Sint16 SDL_DeltaX = 0; |
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36 static Sint16 SDL_DeltaY = 0; |
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37 static Uint8 SDL_ButtonState = 0; |
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38 |
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39 |
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40 /* Public functions */ |
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41 int SDL_MouseInit(void) |
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42 { |
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43 /* The mouse is at (0,0) */ |
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44 SDL_MouseX = 0; |
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45 SDL_MouseY = 0; |
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46 SDL_DeltaX = 0; |
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47 SDL_DeltaY = 0; |
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48 SDL_ButtonState = 0; |
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49 |
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50 /* That's it! */ |
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51 return(0); |
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52 } |
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53 void SDL_MouseQuit(void) |
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54 { |
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55 } |
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56 |
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57 /* We lost the mouse, so post button up messages for all pressed buttons */ |
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58 void SDL_ResetMouse(void) |
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59 { |
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60 Uint8 i; |
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61 for ( i = 0; i < sizeof(SDL_ButtonState)*8; ++i ) { |
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62 if ( SDL_ButtonState & SDL_BUTTON(i) ) { |
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63 SDL_PrivateMouseButton(SDL_RELEASED, i, 0, 0); |
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64 } |
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65 } |
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66 } |
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67 |
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68 Uint8 SDL_GetMouseState (int *x, int *y) |
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69 { |
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70 if ( x ) { |
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71 *x = SDL_MouseX; |
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72 } |
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73 if ( y ) { |
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74 *y = SDL_MouseY; |
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75 } |
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76 return(SDL_ButtonState); |
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77 } |
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78 |
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79 Uint8 SDL_GetRelativeMouseState (int *x, int *y) |
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80 { |
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81 if ( x ) |
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82 *x = SDL_DeltaX; |
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83 if ( y ) |
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84 *y = SDL_DeltaY; |
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85 SDL_DeltaX = 0; |
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86 SDL_DeltaY = 0; |
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87 return(SDL_ButtonState); |
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88 } |
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89 |
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90 static void ClipOffset(Sint16 *x, Sint16 *y) |
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91 { |
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92 /* This clips absolute mouse coordinates when the apparent |
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93 display surface is smaller than the real display surface. |
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94 */ |
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95 if ( SDL_VideoSurface->offset ) { |
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96 *y -= SDL_VideoSurface->offset/SDL_VideoSurface->pitch; |
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97 *x -= (SDL_VideoSurface->offset%SDL_VideoSurface->pitch)/ |
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98 SDL_VideoSurface->format->BytesPerPixel; |
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99 } |
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100 } |
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101 |
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102 /* These are global for SDL_eventloop.c */ |
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103 int SDL_PrivateMouseMotion(Uint8 buttonstate, int relative, Sint16 x, Sint16 y) |
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104 { |
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105 int posted; |
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106 Uint16 X, Y; |
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107 Sint16 Xrel; |
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108 Sint16 Yrel; |
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109 |
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110 /* Don't handle mouse motion if there's no cursor surface */ |
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111 if ( SDL_VideoSurface == NULL ) { |
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112 return(0); |
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113 } |
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114 |
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115 /* Default buttonstate is the current one */ |
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116 if ( ! buttonstate ) { |
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117 buttonstate = SDL_ButtonState; |
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118 } |
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119 |
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120 Xrel = x; |
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121 Yrel = y; |
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122 if ( relative ) { |
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123 /* Push the cursor around */ |
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124 x = (SDL_MouseX+x); |
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125 y = (SDL_MouseY+y); |
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126 } else { |
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127 /* Do we need to clip {x,y} ? */ |
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128 ClipOffset(&x, &y); |
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129 } |
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130 |
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131 /* Mouse coordinates range from 0 - width-1 and 0 - height-1 */ |
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132 if ( x < 0 ) |
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133 X = 0; |
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134 else |
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135 if ( x >= SDL_VideoSurface->w ) |
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136 X = SDL_VideoSurface->w-1; |
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137 else |
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138 X = (Uint16)x; |
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139 |
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140 if ( y < 0 ) |
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141 Y = 0; |
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142 else |
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143 if ( y >= SDL_VideoSurface->h ) |
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144 Y = SDL_VideoSurface->h-1; |
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145 else |
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146 Y = (Uint16)y; |
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147 |
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148 /* If not relative mode, generate relative motion from clamped X/Y. |
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149 This prevents lots of extraneous large delta relative motion when |
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150 the screen is windowed mode and the mouse is outside the window. |
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151 */ |
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152 if ( ! relative ) { |
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153 Xrel = X-SDL_MouseX; |
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154 Yrel = Y-SDL_MouseY; |
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155 } |
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156 |
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157 /* Drop events that don't change state */ |
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158 if ( ! Xrel && ! Yrel ) { |
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159 #if 0 |
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160 printf("Mouse event didn't change state - dropped!\n"); |
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161 #endif |
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162 return(0); |
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163 } |
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164 |
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165 /* Update internal mouse state */ |
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166 SDL_ButtonState = buttonstate; |
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167 SDL_MouseX = X; |
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168 SDL_MouseY = Y; |
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169 SDL_DeltaX += Xrel; |
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170 SDL_DeltaY += Yrel; |
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171 SDL_MoveCursor(SDL_MouseX, SDL_MouseY); |
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172 |
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173 /* Post the event, if desired */ |
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174 posted = 0; |
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175 if ( SDL_ProcessEvents[SDL_MOUSEMOTION] == SDL_ENABLE ) { |
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176 SDL_Event event; |
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177 SDL_memset(&event, 0, sizeof(event)); |
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178 event.type = SDL_MOUSEMOTION; |
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179 event.motion.state = buttonstate; |
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180 event.motion.x = X; |
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181 event.motion.y = Y; |
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182 event.motion.xrel = Xrel; |
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183 event.motion.yrel = Yrel; |
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184 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { |
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185 posted = 1; |
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186 SDL_PushEvent(&event); |
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187 } |
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188 } |
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189 return(posted); |
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190 } |
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191 |
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192 int SDL_PrivateMouseButton(Uint8 state, Uint8 button, Sint16 x, Sint16 y) |
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193 { |
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194 SDL_Event event; |
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195 int posted; |
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196 int move_mouse; |
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197 Uint8 buttonstate; |
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198 |
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199 SDL_memset(&event, 0, sizeof(event)); |
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200 |
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201 /* Check parameters */ |
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202 if ( x || y ) { |
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203 ClipOffset(&x, &y); |
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204 move_mouse = 1; |
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205 /* Mouse coordinates range from 0 - width-1 and 0 - height-1 */ |
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206 if ( x < 0 ) |
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207 x = 0; |
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208 else |
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209 if ( x >= SDL_VideoSurface->w ) |
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210 x = SDL_VideoSurface->w-1; |
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211 |
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212 if ( y < 0 ) |
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213 y = 0; |
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214 else |
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215 if ( y >= SDL_VideoSurface->h ) |
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216 y = SDL_VideoSurface->h-1; |
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217 } else { |
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218 move_mouse = 0; |
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219 } |
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220 if ( ! x ) |
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221 x = SDL_MouseX; |
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222 if ( ! y ) |
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223 y = SDL_MouseY; |
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224 |
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225 /* Figure out which event to perform */ |
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226 buttonstate = SDL_ButtonState; |
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227 switch ( state ) { |
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228 case SDL_PRESSED: |
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229 event.type = SDL_MOUSEBUTTONDOWN; |
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230 buttonstate |= SDL_BUTTON(button); |
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231 break; |
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232 case SDL_RELEASED: |
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233 event.type = SDL_MOUSEBUTTONUP; |
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234 buttonstate &= ~SDL_BUTTON(button); |
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235 break; |
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236 default: |
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237 /* Invalid state -- bail */ |
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238 return(0); |
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239 } |
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240 |
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241 /* Update internal mouse state */ |
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242 SDL_ButtonState = buttonstate; |
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243 if ( move_mouse ) { |
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244 SDL_MouseX = x; |
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245 SDL_MouseY = y; |
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246 SDL_MoveCursor(SDL_MouseX, SDL_MouseY); |
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247 } |
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248 |
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249 /* Post the event, if desired */ |
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250 posted = 0; |
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251 if ( SDL_ProcessEvents[event.type] == SDL_ENABLE ) { |
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252 event.button.state = state; |
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253 event.button.button = button; |
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254 event.button.x = x; |
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255 event.button.y = y; |
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256 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { |
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257 posted = 1; |
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258 SDL_PushEvent(&event); |
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259 } |
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260 } |
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261 return(posted); |
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262 } |
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263 |