Mercurial > sdl-ios-xcode
annotate docs/man3/SDL_Event.3 @ 59:b685c94f8db7
Ryan's IMPS/2 mouse fix
| author | Sam Lantinga <slouken@lokigames.com> |
|---|---|
| date | Mon, 11 Jun 2001 15:48:32 +0000 |
| parents | 55f1f1b3e27d |
| children | e5bc29de3f0a |
| rev | line source |
|---|---|
|
55
55f1f1b3e27d
Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
1 .TH "SDL_Event" "3" "Sun 10 Jun 2001, 19:40" "SDL" "SDL API Reference" |
| 0 | 2 .SH "NAME" |
| 3 SDL_Event\- General event structure | |
| 4 .SH "STRUCTURE DEFINITION" | |
| 5 .PP | |
| 6 .nf | |
| 7 \f(CWtypedef union{ | |
| 8 Uint8 type; | |
| 9 SDL_ActiveEvent active; | |
| 10 SDL_KeyboardEvent key; | |
| 11 SDL_MouseMotionEvent motion; | |
| 12 SDL_MouseButtonEvent button; | |
| 13 SDL_JoyAxisEvent jaxis; | |
| 14 SDL_JoyBallEvent jball; | |
| 15 SDL_JoyHatEvent jhat; | |
| 16 SDL_JoyButtonEvent jbutton; | |
| 17 SDL_ResizeEvent resize; | |
| 18 SDL_QuitEvent quit; | |
| 19 SDL_UserEvent user; | |
| 20 SDL_SywWMEvent syswm; | |
| 21 } SDL_Event;\fR | |
| 22 .fi | |
| 23 .PP | |
| 24 .SH "STRUCTURE DATA" | |
| 25 .TP 20 | |
| 26 \fBtype\fR | |
| 27 The type of event | |
| 28 .TP 20 | |
| 29 \fBactive\fR | |
| 30 \fIActivation event\fR | |
| 31 .TP 20 | |
| 32 \fBkey\fR | |
| 33 \fIKeyboard event\fR | |
| 34 .TP 20 | |
| 35 \fBmotion\fR | |
| 36 \fIMouse motion event\fR | |
| 37 .TP 20 | |
| 38 \fBbutton\fR | |
| 39 \fIMouse button event\fR | |
| 40 .TP 20 | |
| 41 \fBjaxis\fR | |
| 42 \fIJoystick axis motion event\fR | |
| 43 .TP 20 | |
| 44 \fBjball\fR | |
| 45 \fIJoystick trackball motion event\fR | |
| 46 .TP 20 | |
| 47 \fBjhat\fR | |
| 48 \fIJoystick hat motion event\fR | |
| 49 .TP 20 | |
| 50 \fBjbutton\fR | |
| 51 \fIJoystick button event\fR | |
| 52 .TP 20 | |
| 53 \fBresize\fR | |
| 54 \fIApplication window resize event\fR | |
| 55 .TP 20 | |
| 56 \fBquit\fR | |
| 57 \fIApplication quit request event\fR | |
| 58 .TP 20 | |
| 59 \fBuser\fR | |
| 60 \fIUser defined event\fR | |
| 61 .TP 20 | |
| 62 \fBsyswm\fR | |
| 63 \fIUndefined window manager event\fR | |
| 64 .SH "DESCRIPTION" | |
| 65 .PP | |
| 66 The \fBSDL_Event\fR union is the core to all event handling is SDL, its probably the most important structure after \fBSDL_Surface\fR\&. \fBSDL_Event\fR is a union of all event structures used in SDL, using it is a simple matter of knowing which union member relates to which event \fBtype\fR\&. | |
| 67 .PP | |
| 68 .TP 20 | |
| 69 \fBEvent \fBtype\fR\fR | |
| 70 \fBEvent Structure\fR | |
| 71 .TP 20 | |
| 72 \fBSDL_ACTIVEEVENT\fP | |
| 73 \fI\fBSDL_ActiveEvent\fR\fR | |
| 74 .TP 20 | |
| 75 \fBSDL_KEYDOWN/UP\fP | |
| 76 \fI\fBSDL_KeyboardEvent\fR\fR | |
| 77 .TP 20 | |
| 78 \fBSDL_MOUSEMOTION\fP | |
| 79 \fI\fBSDL_MouseMotionEvent\fR\fR | |
| 80 .TP 20 | |
| 81 \fBSDL_MOUSEBUTTONDOWN/UP\fP | |
| 82 \fI\fBSDL_MouseButtonEvent\fR\fR | |
| 83 .TP 20 | |
| 84 \fBSDL_JOYAXISMOTION\fP | |
| 85 \fI\fBSDL_JoyAxisEvent\fR\fR | |
| 86 .TP 20 | |
| 87 \fBSDL_JOYBALLMOTION\fP | |
| 88 \fI\fBSDL_JoyBallEvent\fR\fR | |
| 89 .TP 20 | |
| 90 \fBSDL_JOYHATMOTION\fP | |
| 91 \fI\fBSDL_JoyHatEvent\fR\fR | |
| 92 .TP 20 | |
| 93 \fBSDL_JOYBUTTONDOWN/UP\fP | |
| 94 \fI\fBSDL_JoyButtonEvent\fR\fR | |
| 95 .TP 20 | |
| 96 \fBSDL_QUIT\fP | |
| 97 \fI\fBSDL_QuitEvent\fR\fR | |
| 98 .TP 20 | |
| 99 \fBSDL_SYSWMEVENT\fP | |
| 100 \fI\fBSDL_SysWMEvent\fR\fR | |
| 101 .TP 20 | |
| 102 \fBSDL_VIDEORESIZE\fP | |
| 103 \fI\fBSDL_ResizeEvent\fR\fR | |
| 104 .TP 20 | |
| 105 \fBSDL_USEREVENT\fP | |
| 106 \fI\fBSDL_UserEvent\fR\fR | |
| 107 .SH "USE" | |
| 108 .PP | |
| 109 The \fBSDL_Event\fR structure has two uses | |
| 110 .IP " \(bu" 6 | |
| 111 Reading events on the event queue | |
| 112 .IP " \(bu" 6 | |
| 113 Placing events on the event queue | |
| 114 .PP | |
| 115 Reading events from the event queue is done with either \fI\fBSDL_PollEvent\fP\fR or \fI\fBSDL_PeepEvents\fP\fR\&. We\&'ll use \fBSDL_PollEvent\fP and step through an example\&. | |
| 116 .PP | |
| 117 First off, we create an empty \fBSDL_Event\fR structure\&. | |
| 118 .PP | |
| 119 .nf | |
| 120 \f(CWSDL_Event test_event;\fR | |
| 121 .fi | |
| 122 .PP | |
| 123 \fBSDL_PollEvent\fP removes the next event from the event queue, if there are no events on the queue it returns \fB0\fR otherwise it returns \fB1\fR\&. We use a \fBwhile\fP loop to process each event in turn\&. | |
| 124 .PP | |
| 125 .nf | |
| 126 \f(CWwhile(SDL_PollEvent(&test_event)) {\fR | |
| 127 .fi | |
| 128 .PP | |
| 129 The \fBSDL_PollEvent\fP function take a pointer to an \fBSDL_Event\fR structure that is to be filled with event information\&. We know that if \fBSDL_PollEvent\fP removes an event from the queue then the event information will be placed in our \fBtest_event\fR structure, but we also know that the \fItype\fP of event will be placed in the \fBtype\fR member of \fBtest_event\fR\&. So to handle each event \fBtype\fR seperately we use a \fBswitch\fP statement\&. | |
| 130 .PP | |
| 131 .nf | |
| 132 \f(CW switch(test_event\&.type) {\fR | |
| 133 .fi | |
| 134 .PP | |
| 135 We need to know what kind of events we\&'re looking for \fIand\fP the event \fBtype\fR\&'s of those events\&. So lets assume we want to detect where the user is moving the mouse pointer within our application\&. We look through our event types and notice that \fBSDL_MOUSEMOTION\fP is, more than likely, the event we\&'re looking for\&. A little \fImore\fR research tells use that \fBSDL_MOUSEMOTION\fP events are handled within the \fI\fBSDL_MouseMotionEvent\fR\fR structure which is the \fBmotion\fR member of \fBSDL_Event\fR\&. We can check for the \fBSDL_MOUSEMOTION\fP event \fBtype\fR within our \fBswitch\fP statement like so: | |
| 136 .PP | |
| 137 .nf | |
| 138 \f(CW case SDL_MOUSEMOTION:\fR | |
| 139 .fi | |
| 140 .PP | |
| 141 All we need do now is read the information out of the \fBmotion\fR member of \fBtest_event\fR\&. | |
| 142 .PP | |
| 143 .nf | |
| 144 \f(CW printf("We got a motion event\&. | |
| 145 "); | |
| 146 printf("Current mouse position is: (%d, %d) | |
| 147 ", test_event\&.motion\&.x, test_event\&.motion\&.y); | |
| 148 break; | |
| 149 default: | |
| 150 printf("Unhandled Event! | |
| 151 "); | |
| 152 break; | |
| 153 } | |
| 154 } | |
| 155 printf("Event queue empty\&. | |
| 156 ");\fR | |
| 157 .fi | |
| 158 .PP | |
| 159 .PP | |
| 160 It is also possible to push events onto the event queue and so use it as a two-way communication path\&. Both \fI\fBSDL_PushEvent\fP\fR and \fI\fBSDL_PeepEvents\fP\fR allow you to place events onto the event queue\&. This is usually used to place a \fBSDL_USEREVENT\fP on the event queue, however you could use it to post fake input events if you wished\&. Creating your own events is a simple matter of choosing the event type you want, setting the \fBtype\fR member and filling the appropriate member structure with information\&. | |
| 161 .PP | |
| 162 .nf | |
| 163 \f(CWSDL_Event user_event; | |
| 164 | |
| 165 user_event\&.type=SDL_USEREVENT; | |
| 166 user_event\&.user\&.code=2; | |
| 167 user_event\&.user\&.data1=NULL; | |
| 168 user_event\&.user\&.data2=NULL; | |
| 169 SDL_PushEvent(&user_event);\fR | |
| 170 .fi | |
| 171 .PP | |
| 172 .SH "SEE ALSO" | |
| 173 .PP | |
| 174 \fI\fBSDL_PollEvent\fP\fR, \fI\fBSDL_PushEvent\fP\fR, \fI\fBSDL_PeepEvents\fP\fR | |
|
55
55f1f1b3e27d
Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
175 ...\" created by instant / docbook-to-man, Sun 10 Jun 2001, 19:40 |