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0
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1 /* Definitions for the new event model;
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2 created 16-jul-91 by Jamie Zawinski
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3 Copyright (C) 1991, 1992, 1993 Free Software Foundation, Inc.
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4 Copyright (C) 1995, 1996 Ben Wing.
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5
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6 This file is part of XEmacs.
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7
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8 XEmacs is free software; you can redistribute it and/or modify it
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9 under the terms of the GNU General Public License as published by the
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10 Free Software Foundation; either version 2, or (at your option) any
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11 later version.
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12
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13 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with XEmacs; see the file COPYING. If not, write to
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20 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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21 Boston, MA 02111-1307, USA. */
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22
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23 /* Synched up with: Not in FSF. */
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24
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25 #ifndef _XEMACS_EVENTS_H_
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26 #define _XEMACS_EVENTS_H_
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27
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28 #include "systime.h"
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29
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30 /* There is one object, called an event_stream. This object contains
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31 callback functions for doing the window-system dependent operations that
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32 XEmacs requires.
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33
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34 If XEmacs is compiled with support for X11 and the X Toolkit, then this
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35 event_stream structure will contain functions that can cope with input
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36 on XEmacs windows on multiple displays, as well as input from dumb tty
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37 frames.
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38
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39 If it is desired to have XEmacs able to open frames on the displays of
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40 multiple heterogeneous machines, X11 and SunView, or X11 and NeXT, for
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41 example, then it will be necessary to construct an event_stream structure
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42 that can cope with the given types. Currently, the only implemented
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43 event_streams are for dumb-ttys, and for X11 plus dumb-ttys.
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44
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45 To implement this for one window system is relatively simple.
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46 To implement this for multiple window systems is trickier and may
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47 not be possible in all situations, but it's been done for X and TTY.
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48
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49 Note that these callbacks are *NOT* console methods; that's because
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50 the routines are not specific to a particular console type but must
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51 be able to simultaneously cope with all allowable console types.
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52
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53 The slots of the event_stream structure:
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54
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55 next_event_cb A function which fills in an XEmacs_event struture
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56 with the next event available. If there is no event
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57 available, then this should block.
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58
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59 IMPORTANT: timer events and especially process
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60 events *must not* be returned if there are
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61 events of other types available; otherwise you
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62 can end up with an infinite loop in Fdiscard_input().
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63
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64 event_pending_cb A function which says whether there are events to be
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65 read. If called with an argument of 0, then this
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66 should say whether calling the next_event_cb will
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67 block. If called with an argument of 1, then this
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68 should say whether there are user-generated events
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69 pending (that is, keypresses or mouse-clicks). This
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70 is used for redisplay optimization, among other
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71 things. On dumb ttys, these two results are the
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72 same, but under a window system, they are not.
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73
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74 If this function is not sure whether there are events
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75 to be read, it *must* return 0. Otherwise various
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76 undesirable effects will occur, such as redisplay
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77 not occurring until the next event occurs.
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78
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79 handle_magic_event_cb XEmacs calls this with an event structure which
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80 contains window-system dependent information that
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81 XEmacs doesn't need to know about, but which must
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82 happen in order. If the next_event_cb never returns
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83 an event of type "magic", this will never be used.
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84
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85 add_timeout_cb Called with an EMACS_TIME, the absolute time at
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86 which a wakeup event should be generated; and a
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87 void *, which is an arbitrary value that will be
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88 returned in the timeout event. The timeouts
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89 generated by this function should be one-shots:
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90 they fire once and then disappear. This callback
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91 should return an int id-number which uniquely
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92 identifies this wakeup. If an implementation
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93 doesn't have microseconds or millisecond
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94 granularity, it should round up to the closest
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95 value it can deal with.
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96
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97 remove_timeout_cb Called with an int, the id number of a wakeup to
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98 discard. This id number must have been returned by
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99 the add_timeout_cb. If the given wakeup has
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100 already expired, this should do nothing.
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101
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102 select_process_cb These callbacks tell the underlying implementation to
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103 unselect_process_cb add or remove a file descriptor from the list of fds
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104 which are polled for inferior-process input. When
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105 input becomes available on the given process
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106 connection, an event of type "process" should be
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107 generated.
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108
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109 select_console_cb These callbacks tell the underlying implementation
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110 unselect_console_cb to add or remove a console from the list of consoles
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111 which are polled for user-input.
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112
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113 select_device_cb These callbacks are used by Unixoid event loops
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114 unselect_device_cb (those that use select() and file descriptors and
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115 have a separate input fd per device).
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116
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117 quitp_cb A handler function called from the `QUIT' macro which
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118 should check whether the quit character has been
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119 typed. On systems with SIGIO, this will not be called
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120 unless the `sigio_happened' flag is true (it is set
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121 from the SIGIO handler).
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122
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123 XEmacs has its own event structures, which are distinct from the event
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124 structures used by X or any other window system. It is the job of the
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125 event_stream layer to translate to this format.
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126
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127 NOTE: #### All timestamps should be measured as milliseconds since XEmacs
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128 started. Currently many or most events have a 0 as their
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129 timestamp value, and for other timestamps, they are raw server
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130 timestamps. (The X protocol doesn't provide any easy way of
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131 translating between server time and real process time; yuck.)
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132
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133 Every event type has the following structures:
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134
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135 channel Where this event occurred on. This will be
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136 a frame, device, console, or nil, depending on the
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137 event type. It is important that an object of
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138 a more specific type than is actually generated
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139 is not substituted -- e.g. there should not be
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140 a frame inserted when a key-press event occurs,
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141 because events on dead channels are automatically
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142 ignored.
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143
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144 Specifically:
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145
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146 -- for button and mouse-motion events, channel
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147 will be a frame. (The translation to a window
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148 occurs later.)
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149 -- for keyboard events, channel will be a console.
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150 Note that fake keyboard events (generated
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151 by `character-to-event' or something that
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152 calls this, such as macros) need to have
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153 the selected console stored into them when
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154 the event is created. This is so that the
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155 correct console-local variables (e.g. the
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156 command builder) will get affected.
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157 -- for timer, process, magic-eval, and eval events,
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158 channel will be nil.
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159 -- for scrollbar misc-user events, channel
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160 will be a window.
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161 -- for menubar misc-user events, channel
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162 will be a frame.
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163 -- for magic events, channel will be a frame
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164 (usually) or a device.
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165
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166 timestamp When this event occurred -- if not known, this
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167 is made up.
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168
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169 In addition, the following structures are specific to particular event
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170 types:
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171
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172 key_press_event
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173 key What keysym this is; an integer or a symbol.
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174 If this is an integer, it will be in the printing
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175 ASCII range: >32 and <127.
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176 modifiers Bucky-bits on that key: control, meta, etc.
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177 For most keys, Shift is not a bit; that is implicit
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178 in the keyboard layout.
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179
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180 button_press_event
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181 button_release_event
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182 button What button went down or up.
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183 modifiers Bucky-bits on that button: shift, control, meta, etc.
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184 x, y Where it was at the button-state-change (in pixels).
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185
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186 pointer_motion_event
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187 x, y Where it was after it moved (in pixels).
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188 modifiers Bucky-bits down when the motion was detected.
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189 (Possibly not all window systems will provide this?)
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190
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191 process_event
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192 process the XEmacs "process" object in question
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193
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194 timeout_event
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195 interval_id The ID returned when the associated call to
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196 add_timeout_cb() was made
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197 ------ the rest of the fields are filled in by XEmacs -----
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198 id_number The XEmacs timeout ID for this timeout (more
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199 than one timeout event can have the same value
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200 here, since XEmacs timeouts, as opposed to
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201 add_timeout_cb() timeouts, can resignal
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202 themselves)
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203 function An elisp function to call when this timeout is
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204 processed.
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205 object The object passed to that function.
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206
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207 eval_event
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208 function An elisp function to call with this event object.
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209 internal_function An unexported function to call with this event
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210 object. This allows eval events to call internal
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211 functions. For a normal eval event, this field
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212 will always be 0.
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213 object Anything.
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214 This kind of event is used internally; sometimes the
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215 window system interface would like to inform XEmacs of
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216 some user action (such as focusing on another frame)
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217 but needs that to happen synchronously with the other
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218 user input, like keypresses. This is useful when
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219 events are reported through callbacks rather
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220 than in the standard event stream.
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221
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222 misc_user_event
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223 function An elisp function to call with this event object.
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224 internal_function Ignored.
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225 object Anything.
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226 This is similar to an eval_event, except that it is
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227 generated by user actions: selections in the
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228 menubar or scrollbar actions. It is a "command"
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229 event, like key and mouse presses (and unlike mouse
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230 motion, process output, and enter and leave window
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231 hooks). In many ways, eval_events are not the same
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232 as keypresses or misc_user_events.
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233
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234 magic_event
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235 No user-serviceable parts within. This is for things
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236 like KeymapNotify and ExposeRegion events and so on
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237 that XEmacs itself doesn't care about, but which it
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238 must do something with for proper interaction with
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239 the window system.
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240
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241 Magic_events are handled somewhat asynchronously, just
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242 like subprocess filters. However, occasionally a
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243 magic_event needs to be handled synchronously; in that
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244 case, the asynchronous handling of the magic_event will
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245 push an eval_event back onto the queue, which will be
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246 handled synchronously later. This is one of the
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247 reasons why eval_events exist; I'm not entirely happy
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248 with this aspect of this event model.
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249
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250 magic_eval_event
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251 This is like an eval event but its contents are
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252 not Lisp-accessible. This allows for "internal
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253 eval events" that call non-Lisp-accessible functions.
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254 Externally, a magic_eval_event just appears as
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255 a magic_event; the Lisp programmer need not know
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256 anything more.
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257 */
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258
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259
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260 struct Lisp_Event;
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261 struct Lisp_Process;
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262
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263 struct event_stream
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264 {
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265 int (*event_pending_p) (int);
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266 void (*next_event_cb) (struct Lisp_Event *);
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267 void (*handle_magic_event_cb) (struct Lisp_Event *);
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268 int (*add_timeout_cb) (EMACS_TIME);
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269 void (*remove_timeout_cb) (int);
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270 void (*select_console_cb) (struct console *);
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271 void (*unselect_console_cb) (struct console *);
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272 void (*select_process_cb) (struct Lisp_Process *);
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273 void (*unselect_process_cb) (struct Lisp_Process *);
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274 void (*quit_p_cb) (void);
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275 };
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276
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277
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278 extern struct event_stream *event_stream;
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279
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280 typedef enum emacs_event_type
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281 {
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282 empty_event,
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283 key_press_event,
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284 button_press_event,
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285 button_release_event,
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286 pointer_motion_event,
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287 process_event,
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288 timeout_event,
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289 magic_event,
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290 magic_eval_event,
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291 eval_event,
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292 misc_user_event,
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293 dead_event
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294 } emacs_event_type;
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295
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296 #define first_event_type empty_event
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297 #define last_event_type dead_event
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298
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299
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300 struct key_data
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301 {
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302 Lisp_Object keysym;
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303 unsigned char modifiers;
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304 };
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305
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306 struct button_data
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307 {
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308 int button;
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309 unsigned char modifiers;
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310 int x, y;
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311 };
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312
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313 struct motion_data
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314 {
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315 int x, y;
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316 unsigned char modifiers;
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317 };
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318
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319 struct process_data
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320 {
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321 Lisp_Object process;
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322 };
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323
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324 struct timeout_data
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325 {
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326 int interval_id;
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327 int id_number;
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328 Lisp_Object function, object;
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329 };
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330
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331 struct eval_data
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332 {
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333 Lisp_Object function;
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334 Lisp_Object object;
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335 };
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336
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337 struct magic_eval_data
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338 {
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339 void (*internal_function) (Lisp_Object);
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340 Lisp_Object object;
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341 };
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342
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343 #if defined (HAVE_X_WINDOWS) && defined(emacs)
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344 # include <X11/Xlib.h>
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345 #endif
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346
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347 #if defined (HAVE_NEXTSTEP) && defined(emacs)
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348 # import <appkit/appkit.h>
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349 #endif
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350
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351 union magic_data
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352 {
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353 char underlying_tty_event;
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354 #ifdef HAVE_X_WINDOWS
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355 XEvent underlying_x_event;
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356 #endif
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357 #ifdef HAVE_NEXTSTEP
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358 NXEvent underlying_ns_event;
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359 #endif
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360 };
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361
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362 struct Lisp_Event
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363 {
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364 /* header->next (aka XEVENT_NEXT ()) is used as follows:
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365 - For dead events, this is the next dead one.
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366 - For events on the command_event_queue, the next one on the queue.
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367 - Likewise for events chained in the command builder.
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368 - Otherwise it's Qnil.
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369 */
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370 struct lrecord_header lheader;
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371 Lisp_Object next;
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372 emacs_event_type event_type;
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373 Lisp_Object channel;
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374 unsigned int timestamp;
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375 union
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376 {
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377 struct key_data key;
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378 struct button_data button;
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379 struct motion_data motion;
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380 struct process_data process;
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381 struct timeout_data timeout;
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382 struct eval_data eval; /* misc_user_event uses this too */
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383 union magic_data magic;
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384 struct magic_eval_data magic_eval;
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385 } event;
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386 };
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387
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388 DECLARE_LRECORD (event, struct Lisp_Event);
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389 #define XEVENT(x) XRECORD (x, event, struct Lisp_Event)
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390 #define XSETEVENT(x, p) XSETRECORD (x, p, event)
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391 #define EVENTP(x) RECORDP (x, event)
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392 #define GC_EVENTP(x) GC_RECORDP (x, event)
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393 #define CHECK_EVENT(x) CHECK_RECORD (x, event)
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394 #define CONCHECK_EVENT(x) CONCHECK_RECORD (x, event)
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395
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396 DECLARE_LRECORD (command_builder, struct command_builder);
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397
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398 #define EVENT_CHANNEL(a) ((a)->channel)
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399 #define EVENT_TYPE(a) ((a)->event_type)
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400 #define XEVENT_TYPE(a) (XEVENT (a)->event_type)
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401 #define EVENT_NEXT(a) ((a)->next)
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402 #define XEVENT_NEXT(e) (XEVENT (e)->next)
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403 #define XSET_EVENT_NEXT(e, n) do { (XEVENT (e)->next = (n)); } while (0)
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404
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405 #define EVENT_CHAIN_LOOP(event, chain) \
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406 for (event = chain; !NILP (event); event = XEVENT_NEXT (event))
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407
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408 #define EVENT_LIVE_P(a) (EVENT_TYPE (a) != dead_event)
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409
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410 #define CHECK_LIVE_EVENT(x) \
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411 do { CHECK_EVENT (x); \
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412 if (! EVENTP (x) \
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413 || ! EVENT_LIVE_P (XEVENT (x))) \
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414 dead_wrong_type_argument (Qevent_live_p, (x)); } while (0)
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415 #define CONCHECK_LIVE_EVENT(x) \
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416 do { CONCHECK_EVENT (x); \
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417 if (! EVENTP (x) \
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418 || ! EVENT_LIVE_P (XEVENT (x))) \
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419 x = wrong_type_argument (Qevent_live_p, (x)); } while (0)
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420
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421
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422 extern Lisp_Object Qevent_live_p;
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423
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424 /* The modifiers XEmacs knows about; these appear in key and button events.
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425 */
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426 #define MOD_CONTROL (1<<0)
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427 #define MOD_META (1<<1)
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428 #define MOD_SUPER (1<<2)
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429 #define MOD_HYPER (1<<3)
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430 #define MOD_ALT (1<<4)
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431 #define MOD_SHIFT (1<<5) /* not used for dual-case characters */
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432
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433 /* Note: under X Windows, MOD_ALT is generated by the Alt key if there are
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434 both Alt and Meta keys. If there are no Meta keys, then Alt generates
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435 MOD_META instead.
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436 */
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437
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438 #ifdef emacs
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439 /* Maybe this should be trickier */
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440 #define KEYSYM(x) (intern (x))
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441
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442 Lisp_Object allocate_command_builder (Lisp_Object console);
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443
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444 void format_event_object (char *buf, struct Lisp_Event *e, int brief);
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445 void character_to_event (Emchar c, struct Lisp_Event *event,
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446 struct console *con,
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447 int use_console_meta_flag);
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448 void enqueue_magic_eval_event (void (*fun) (Lisp_Object), Lisp_Object object);
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449 void zero_event (struct Lisp_Event *e);
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450
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451 void deallocate_event_chain (Lisp_Object event);
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452 Lisp_Object event_chain_tail (Lisp_Object event);
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453 void enqueue_event (Lisp_Object event, Lisp_Object *head, Lisp_Object *tail);
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454 Lisp_Object dequeue_event (Lisp_Object *head, Lisp_Object *tail);
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455 void enqueue_event_chain (Lisp_Object event_chain, Lisp_Object *head,
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456 Lisp_Object *tail);
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457 int event_chain_count (Lisp_Object event_chain);
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458 void nth_of_key_sequence_as_event (Lisp_Object seq, int n, Lisp_Object event);
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459 Lisp_Object key_sequence_to_event_chain (Lisp_Object seq);
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460 Lisp_Object event_chain_find_previous (Lisp_Object event_chain,
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461 Lisp_Object event);
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462 Lisp_Object event_chain_nth (Lisp_Object event_chain, int n);
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463 Lisp_Object copy_event_chain (Lisp_Object event_chain);
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464
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465 /* True is this is a non-internal event
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466 (keyboard press, menu, scrollbar, mouse button) */
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467 int command_event_p (Lisp_Object event);
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468
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469 struct console *event_console_or_selected (Lisp_Object event);
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470
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471 int event_stream_event_pending_p (int user);
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472 void event_stream_next_event (struct Lisp_Event *event);
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473 void event_stream_handle_magic_event (struct Lisp_Event *event);
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474 void event_stream_select_console (struct console *c);
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475 void event_stream_unselect_console (struct console *c);
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476 void event_stream_select_process (struct Lisp_Process *proc);
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477 void event_stream_unselect_process (struct Lisp_Process *proc);
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478 void event_stream_quit_p (void);
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479
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480 struct low_level_timeout
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481 {
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482 int id;
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483 EMACS_TIME time;
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484 struct low_level_timeout *next;
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485 };
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486
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487 int add_low_level_timeout (struct low_level_timeout **timeout_list,
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488 EMACS_TIME thyme);
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489 void remove_low_level_timeout (struct low_level_timeout **timeout_list,
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490 int id);
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491 int get_low_level_timeout_interval (struct low_level_timeout *
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492 timeout_list, EMACS_TIME *interval);
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493 int pop_low_level_timeout (struct low_level_timeout **timeout_list,
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494 EMACS_TIME *time_out);
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495 int event_stream_generate_wakeup (unsigned int milliseconds,
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496 unsigned int vanilliseconds,
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497 Lisp_Object function,
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498 Lisp_Object object,
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499 int async_p);
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500 void event_stream_disable_wakeup (int id, int async_p);
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501 void event_stream_deal_with_async_timeout (int interval_id);
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502
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503 /* from signal.c */
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504 int event_stream_add_async_timeout (EMACS_TIME thyme);
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505 void event_stream_remove_async_timeout (int id);
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506
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507 void emacs_handle_focus_change_preliminary (Lisp_Object frame_inp_and_dev);
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508 void emacs_handle_focus_change_final (Lisp_Object frame_inp_and_dev);
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509
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510 Lisp_Object extract_this_command_keys_nth_mouse_event (int n);
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511 Lisp_Object extract_vector_nth_mouse_event (Lisp_Object vector, int n);
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512
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513 void single_console_state (void);
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514 void any_console_state (void);
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515 int in_single_console_state (void);
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516
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517 #ifdef HAVE_UNIXOID_EVENT_LOOP
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518 /* Ceci n'est pas un pipe. */
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519 extern int signal_event_pipe[];
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520
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521 void signal_fake_event (void);
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522 void drain_signal_event_pipe (void);
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523
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524 extern int fake_event_occurred;
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525
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526 int event_stream_unixoid_select_console (struct console *con);
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527 int event_stream_unixoid_unselect_console (struct console *con);
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528 int event_stream_unixoid_select_process (struct Lisp_Process *proc);
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529 int event_stream_unixoid_unselect_process (struct Lisp_Process *proc);
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530 int read_event_from_tty_or_stream_desc (struct Lisp_Event *event,
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531 struct console *c, int fd);
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532 #endif /* HAVE_UNIXOID_EVENT_LOOP */
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533
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534 extern int emacs_is_blocking;
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535
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536 extern Lisp_Object Vcontrolling_terminal;
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537
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538 extern volatile int sigint_happened;
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539
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540 /* Define this if you want the tty event stream to be used when the
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541 first console is tty, even if HAVE_X_WINDOWS is defined */
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542 /* #define DEBUG_TTY_EVENT_STREAM */
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543
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544 #endif /* emacs */
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545
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546 #endif /* _XEMACS_EVENTS_H_ */
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