annotate docs/html/sdlkeysym.html @ 0:74212992fb08

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author Sam Lantinga <slouken@lokigames.com>
date Thu, 26 Apr 2001 16:45:43 +0000
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1 <HTML
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2 ><HEAD
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3 ><TITLE
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4 >SDL_keysym</TITLE
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5 ><META
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6 NAME="GENERATOR"
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.61
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8 "><LINK
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9 REL="HOME"
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10 TITLE="SDL Library Documentation"
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11 HREF="index.html"><LINK
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12 REL="UP"
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13 TITLE="SDL Event Structures."
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14 HREF="eventstructures.html"><LINK
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15 REL="PREVIOUS"
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16 TITLE="SDL_QuitEvent"
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17 HREF="sdlquitevent.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDLKey"
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20 HREF="sdlkey.html"></HEAD
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21 ><BODY
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22 CLASS="REFENTRY"
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23 BGCOLOR="#FFF8DC"
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24 TEXT="#000000"
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25 LINK="#0000ee"
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26 VLINK="#551a8b"
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27 ALINK="#ff0000"
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28 ><DIV
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29 CLASS="NAVHEADER"
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30 ><TABLE
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31 WIDTH="100%"
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32 BORDER="0"
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33 CELLPADDING="0"
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34 CELLSPACING="0"
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35 ><TR
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36 ><TH
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37 COLSPAN="3"
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38 ALIGN="center"
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39 >SDL Library Documentation</TH
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40 ></TR
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41 ><TR
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42 ><TD
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43 WIDTH="10%"
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44 ALIGN="left"
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45 VALIGN="bottom"
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46 ><A
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47 HREF="sdlquitevent.html"
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48 >Prev</A
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49 ></TD
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50 ><TD
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51 WIDTH="80%"
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52 ALIGN="center"
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53 VALIGN="bottom"
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54 ></TD
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55 ><TD
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56 WIDTH="10%"
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57 ALIGN="right"
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58 VALIGN="bottom"
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59 ><A
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60 HREF="sdlkey.html"
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61 >Next</A
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62 ></TD
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63 ></TR
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64 ></TABLE
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65 ><HR
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66 ALIGN="LEFT"
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67 WIDTH="100%"></DIV
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68 ><H1
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69 ><A
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70 NAME="SDLKEYSYM"
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71 >SDL_keysym</A
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72 ></H1
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73 ><DIV
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74 CLASS="REFNAMEDIV"
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75 ><A
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76 NAME="AEN4116"
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77 ></A
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78 ><H2
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79 >Name</H2
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80 >SDL_keysym&nbsp;--&nbsp;Keysym structure</DIV
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81 ><DIV
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82 CLASS="REFSECT1"
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83 ><A
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84 NAME="AEN4119"
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85 ></A
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86 ><H2
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87 >Structure Definition</H2
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88 ><PRE
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89 CLASS="PROGRAMLISTING"
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90 >typedef struct{
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91 Uint8 scancode;
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92 SDLKey sym;
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93 SDLMod mod;
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94 Uint16 unicode;
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95 } SDL_keysym;</PRE
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96 ></DIV
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97 ><DIV
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98 CLASS="REFSECT1"
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99 ><A
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100 NAME="AEN4122"
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101 ></A
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102 ><H2
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103 >Structure Data</H2
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104 ><DIV
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105 CLASS="INFORMALTABLE"
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106 ><A
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107 NAME="AEN4124"
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108 ></A
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109 ><P
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110 ></P
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111 ><TABLE
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112 BORDER="0"
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113 CLASS="CALSTABLE"
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114 ><TBODY
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115 ><TR
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116 ><TD
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117 ALIGN="LEFT"
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118 VALIGN="TOP"
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119 ><TT
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120 CLASS="STRUCTFIELD"
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121 ><I
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122 >scancode</I
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123 ></TT
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124 ></TD
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125 ><TD
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126 ALIGN="LEFT"
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127 VALIGN="TOP"
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128 >Hardware specific scancode</TD
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129 ></TR
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130 ><TR
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131 ><TD
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132 ALIGN="LEFT"
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133 VALIGN="TOP"
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134 ><TT
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135 CLASS="STRUCTFIELD"
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136 ><I
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137 >sym</I
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138 ></TT
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139 ></TD
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140 ><TD
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141 ALIGN="LEFT"
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142 VALIGN="TOP"
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143 >SDL virtual keysym</TD
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144 ></TR
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145 ><TR
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146 ><TD
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147 ALIGN="LEFT"
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148 VALIGN="TOP"
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149 ><TT
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150 CLASS="STRUCTFIELD"
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151 ><I
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152 >mod</I
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153 ></TT
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154 ></TD
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155 ><TD
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156 ALIGN="LEFT"
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157 VALIGN="TOP"
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158 >Current key modifiers</TD
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159 ></TR
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160 ><TR
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161 ><TD
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162 ALIGN="LEFT"
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163 VALIGN="TOP"
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164 ><TT
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165 CLASS="STRUCTFIELD"
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166 ><I
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167 >unicode</I
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168 ></TT
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169 ></TD
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170 ><TD
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171 ALIGN="LEFT"
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172 VALIGN="TOP"
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173 >Translated character</TD
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174 ></TR
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175 ></TBODY
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176 ></TABLE
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177 ><P
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178 ></P
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179 ></DIV
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180 ></DIV
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181 ><DIV
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182 CLASS="REFSECT1"
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183 ><A
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184 NAME="AEN4143"
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185 ></A
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186 ><H2
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187 >Description</H2
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188 ><P
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189 >The <SPAN
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190 CLASS="STRUCTNAME"
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191 >SDL_keysym</SPAN
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192 > structure is used by reporting key presses and releases since it is a part of the <A
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193 HREF="sdlkeyboardevent.html"
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194 ><SPAN
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195 CLASS="STRUCTNAME"
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196 >SDL_KeyboardEvent</SPAN
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197 ></A
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198 >.</P
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199 ><P
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200 >The <TT
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201 CLASS="STRUCTFIELD"
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202 ><I
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203 >scancode</I
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204 ></TT
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205 > field should generally be left alone, it is the hardware dependent scancode returned by the keyboard. The <TT
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206 CLASS="STRUCTFIELD"
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207 ><I
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208 >sym</I
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209 ></TT
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210 > field is extremely useful. It is the SDL-defined value of the key (see <A
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211 HREF="sdlkey.html"
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212 >SDL Key Syms</A
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213 >. This field is very useful when you are checking for certain key presses, like so:
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214 <PRE
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215 CLASS="PROGRAMLISTING"
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216 >.
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217 .
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218 while(SDL_PollEvent(&#38;event)){
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219 switch(event.type){
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220 case SDL_KEYDOWN:
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221 if(event.key.keysym.sym==SDLK_LEFT)
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222 move_left();
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223 break;
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224 .
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225 .
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226 .
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227 }
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228 }
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229 .
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230 .</PRE
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231 >
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232 <TT
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233 CLASS="STRUCTFIELD"
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234 ><I
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235 >mod</I
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236 ></TT
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237 > stores the current state of the keyboard modifiers as explained in <A
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238 HREF="sdlgetmodstate.html"
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239 ><TT
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240 CLASS="FUNCTION"
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241 >SDL_GetModState</TT
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242 ></A
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243 >. The <TT
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244 CLASS="STRUCTFIELD"
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245 ><I
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246 >unicode</I
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247 ></TT
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248 > is only used when UNICODE translation is enabled with <A
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249 HREF="sdlenableunicode.html"
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250 ><TT
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251 CLASS="FUNCTION"
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252 >SDL_EnableUNICODE</TT
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253 ></A
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254 >. If <TT
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255 CLASS="STRUCTFIELD"
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256 ><I
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257 >unicode</I
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258 ></TT
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259 > is non-zero then this a the UNICODE character corresponding to the keypress. If the high 9 bits of the character are 0, then this maps to the equivalent ASCII character:
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260 <PRE
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261 CLASS="PROGRAMLISTING"
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262 >char ch;
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263 if ( (keysym.unicode &#38; 0xFF80) == 0 ) {
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264 ch = keysym.unicode &#38; 0x7F;
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265 }
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266 else {
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267 printf("An International Character.\n");
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268 }</PRE
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269 >
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270 UNICODE translation does have a slight overhead so don't enable it unless its needed.</P
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271 ></DIV
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272 ><DIV
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273 CLASS="REFSECT1"
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274 ><A
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275 NAME="AEN4162"
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276 ></A
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277 ><H2
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278 >See Also</H2
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279 ><P
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280 ><A
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281 HREF="sdlkey.html"
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282 ><SPAN
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283 CLASS="STRUCTNAME"
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284 >SDLKey</SPAN
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285 ></A
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286 ></P
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287 ></DIV
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288 ><DIV
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289 CLASS="NAVFOOTER"
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290 ><HR
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291 ALIGN="LEFT"
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292 WIDTH="100%"><TABLE
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293 WIDTH="100%"
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Sam Lantinga <slouken@lokigames.com>
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294 BORDER="0"
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295 CELLPADDING="0"
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296 CELLSPACING="0"
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297 ><TR
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298 ><TD
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299 WIDTH="33%"
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300 ALIGN="left"
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301 VALIGN="top"
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302 ><A
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303 HREF="sdlquitevent.html"
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304 >Prev</A
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305 ></TD
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306 ><TD
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307 WIDTH="34%"
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308 ALIGN="center"
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309 VALIGN="top"
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310 ><A
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311 HREF="index.html"
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312 >Home</A
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313 ></TD
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314 ><TD
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315 WIDTH="33%"
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316 ALIGN="right"
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317 VALIGN="top"
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318 ><A
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319 HREF="sdlkey.html"
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320 >Next</A
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321 ></TD
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322 ></TR
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323 ><TR
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324 ><TD
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325 WIDTH="33%"
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326 ALIGN="left"
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327 VALIGN="top"
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328 >SDL_QuitEvent</TD
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329 ><TD
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330 WIDTH="34%"
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331 ALIGN="center"
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332 VALIGN="top"
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333 ><A
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334 HREF="eventstructures.html"
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335 >Up</A
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336 ></TD
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337 ><TD
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Sam Lantinga <slouken@lokigames.com>
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338 WIDTH="33%"
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339 ALIGN="right"
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340 VALIGN="top"
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341 >SDLKey</TD
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342 ></TR
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343 ></TABLE
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344 ></DIV
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345 ></BODY
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346 ></HTML
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347 >