Mercurial > sdl-ios-xcode

annotate docs/html/sdlseteventfilter.html @ 3950:9d9e15ab1697 SDL-1.2

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Check if yasm supports a nasm-specific syntax we use (it doesn't in 0.5.0, which is still common in Linux distros, and does in 0.6.0). Disable it if we don't, attempting to fallback to using nasm. Thanks to Mike Frysinger for the patch. Fixes Bugzilla #393.
author Ryan C. Gordon <icculus@icculus.org>
date Mon, 04 Jun 2007 11:06:48 +0000
parents 355632dca928
children
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1 <HTML
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2 ><HEAD
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3 ><TITLE
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4 >SDL_SetEventFilter</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 1.76b+
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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="Event Functions."
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14 HREF="eventfunctions.html"><LINK
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15 REL="PREVIOUS"
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16 TITLE="SDL_PushEvent"
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17 HREF="sdlpushevent.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_GetEventFilter"
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20 HREF="sdlgeteventfilter.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 SUMMARY="Header navigation table"
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32 WIDTH="100%"
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33 BORDER="0"
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34 CELLPADDING="0"
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35 CELLSPACING="0"
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36 ><TR
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37 ><TH
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38 COLSPAN="3"
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39 ALIGN="center"
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40 >SDL Library Documentation</TH
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41 ></TR
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42 ><TR
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43 ><TD
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44 WIDTH="10%"
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45 ALIGN="left"
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46 VALIGN="bottom"
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47 ><A
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48 HREF="sdlpushevent.html"
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49 ACCESSKEY="P"
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50 >Prev</A
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51 ></TD
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52 ><TD
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53 WIDTH="80%"
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54 ALIGN="center"
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55 VALIGN="bottom"
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56 ></TD
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57 ><TD
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58 WIDTH="10%"
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59 ALIGN="right"
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60 VALIGN="bottom"
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61 ><A
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62 HREF="sdlgeteventfilter.html"
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63 ACCESSKEY="N"
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64 >Next</A
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65 ></TD
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66 ></TR
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67 ></TABLE
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68 ><HR
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69 ALIGN="LEFT"
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70 WIDTH="100%"></DIV
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71 ><H1
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72 ><A
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73 NAME="SDLSETEVENTFILTER"
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74 ></A
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75 >SDL_SetEventFilter</H1
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76 ><DIV
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77 CLASS="REFNAMEDIV"
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78 ><A
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79 NAME="AEN5575"
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80 ></A
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81 ><H2
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82 >Name</H2
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83 >SDL_SetEventFilter&nbsp;--&nbsp;Sets up a filter to process all events before they are posted
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84 to the event queue.</DIV
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85 ><DIV
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86 CLASS="REFSYNOPSISDIV"
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87 ><A
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88 NAME="AEN5578"
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89 ></A
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90 ><H2
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91 >Synopsis</H2
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92 ><DIV
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93 CLASS="FUNCSYNOPSIS"
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94 ><A
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95 NAME="AEN5579"
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96 ></A
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97 ><P
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98 ></P
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99 ><PRE
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100 CLASS="FUNCSYNOPSISINFO"
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101 >#include "SDL.h"</PRE
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102 ><P
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103 ><CODE
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104 ><CODE
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105 CLASS="FUNCDEF"
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106 >void <B
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107 CLASS="FSFUNC"
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108 >SDL_SetEventFilter</B
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109 ></CODE
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110 >(SDL_EventFilter filter);</CODE
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111 ></P
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112 ><P
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113 ></P
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114 ></DIV
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115 ></DIV
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116 ><DIV
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117 CLASS="REFSECT1"
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118 ><A
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119 NAME="AEN5585"
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120 ></A
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121 ><H2
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122 >Description</H2
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123 ><P
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124 >This function sets up a filter to process all events before they are posted
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125 to the event queue. This is a very powerful and flexible feature. The filter
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126 is prototyped as:
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127 <PRE
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128 CLASS="PROGRAMLISTING"
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129 >typedef int (*SDL_EventFilter)(const SDL_Event *event);</PRE
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130 >
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131 If the filter returns <SPAN
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132 CLASS="RETURNVALUE"
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133 >1</SPAN
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134 >, then the event will be
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135 added to the internal queue. If it returns <SPAN
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136 CLASS="RETURNVALUE"
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137 >0</SPAN
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138 >,
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139 then the event will be dropped from the queue. This allows selective
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140 filtering of dynamically.</P
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141 ><P
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142 >There is one caveat when dealing with the <TT
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143 CLASS="LITERAL"
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144 >SDL_QUITEVENT</TT
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145 > event type. The
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146 event filter is only called when the window manager desires to close the
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147 application window. If the event filter returns 1, then the window will
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148 be closed, otherwise the window will remain open if possible.
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149 If the quit event is generated by an interrupt signal, it will bypass the
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150 internal queue and be delivered to the application at the next event poll.</P
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151 ><DIV
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152 CLASS="NOTE"
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153 ><BLOCKQUOTE
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154 CLASS="NOTE"
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155 ><P
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156 ><B
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157 >Note: </B
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158 >Events pushed onto the queue with <A
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159 HREF="sdlpushevent.html"
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160 ><TT
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161 CLASS="FUNCTION"
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162 >SDL_PushEvent</TT
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163 ></A
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164 > or <A
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165 HREF="sdlpeepevents.html"
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166 ><TT
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167 CLASS="FUNCTION"
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168 >SDL_PeepEvents</TT
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169 ></A
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170 > do not get passed through the event filter.</P
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171 ></BLOCKQUOTE
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172 ></DIV
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173 ><DIV
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174 CLASS="NOTE"
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175 ><BLOCKQUOTE
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176 CLASS="NOTE"
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177 ><P
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178 ><B
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179 >Note: </B
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180 ><SPAN
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181 CLASS="emphasis"
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182 ><I
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183 CLASS="EMPHASIS"
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184 >Be Careful!</I
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185 ></SPAN
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186 > The event filter function may run in a different thread so be careful what you do within it.</P
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187 ></BLOCKQUOTE
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188 ></DIV
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189 ></DIV
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190 ><DIV
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191 CLASS="REFSECT1"
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192 ><A
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193 NAME="AEN5602"
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194 ></A
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195 ><H2
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196 >See Also</H2
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197 ><P
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198 ><A
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199 HREF="sdlevent.html"
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200 ><SPAN
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201 CLASS="STRUCTNAME"
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202 >SDL_Event</SPAN
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203 ></A
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204 >,
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205 <A
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206 HREF="sdlgeteventfilter.html"
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207 ><TT
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208 CLASS="FUNCTION"
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209 >SDL_GetEventFilter</TT
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210 ></A
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211 >,
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212 <A
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213 HREF="sdlpushevent.html"
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214 ><TT
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215 CLASS="FUNCTION"
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216 >SDL_PushEvent</TT
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217 ></A
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218 ></P
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219 ></DIV
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220 ><DIV
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221 CLASS="NAVFOOTER"
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222 ><HR
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223 ALIGN="LEFT"
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224 WIDTH="100%"><TABLE
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225 SUMMARY="Footer navigation table"
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226 WIDTH="100%"
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227 BORDER="0"
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228 CELLPADDING="0"
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229 CELLSPACING="0"
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230 ><TR
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231 ><TD
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232 WIDTH="33%"
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233 ALIGN="left"
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234 VALIGN="top"
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235 ><A
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236 HREF="sdlpushevent.html"
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237 ACCESSKEY="P"
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238 >Prev</A
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239 ></TD
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240 ><TD
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241 WIDTH="34%"
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242 ALIGN="center"
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243 VALIGN="top"
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244 ><A
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245 HREF="index.html"
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246 ACCESSKEY="H"
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247 >Home</A
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248 ></TD
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249 ><TD
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250 WIDTH="33%"
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251 ALIGN="right"
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252 VALIGN="top"
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253 ><A
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254 HREF="sdlgeteventfilter.html"
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255 ACCESSKEY="N"
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256 >Next</A
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257 ></TD
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258 ></TR
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259 ><TR
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260 ><TD
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261 WIDTH="33%"
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262 ALIGN="left"
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263 VALIGN="top"
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264 >SDL_PushEvent</TD
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265 ><TD
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266 WIDTH="34%"
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267 ALIGN="center"
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268 VALIGN="top"
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269 ><A
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270 HREF="eventfunctions.html"
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271 ACCESSKEY="U"
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272 >Up</A
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273 ></TD
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274 ><TD
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275 WIDTH="33%"
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276 ALIGN="right"
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277 VALIGN="top"
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278 >SDL_GetEventFilter</TD
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279 ></TR
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280 ></TABLE
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281 ></DIV
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282 ></BODY
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283 ></HTML
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284 >