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annotate docs/html/sdlseteventfilter.html @ 4928:930614179450 SDL-1.2

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Patch from Haiku's Google Code-In student Daniel Marth, fixes an off-by-one issue in bwindow.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 03 Dec 2010 16:55:25 -0800
parents 355632dca928
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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 >