| 1 | /* bind.c |
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| 2 | * Copyright (C) 2008 Alex Graveley |
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| 3 | * Copyright (C) 2010 Ulrik Sverdrup <ulrik.sverdrup@gmail.com> |
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| 4 | * |
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| 5 | * Permission is hereby granted, free of charge, to any person obtaining |
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| 6 | * a copy of this software and associated documentation files (the |
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| 7 | * "Software"), to deal in the Software without restriction, including |
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| 8 | * without limitation the rights to use, copy, modify, merge, publish, |
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| 9 | * distribute, sublicense, and/or sell copies of the Software, and to |
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| 10 | * permit persons to whom the Software is furnished to do so, subject to |
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| 11 | * the following conditions: |
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| 12 | * |
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| 13 | * The above copyright notice and this permission notice shall be |
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| 14 | * included in all copies or substantial portions of the Software. |
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| 15 | * |
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| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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| 17 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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| 18 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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| 19 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
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| 20 | * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
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| 21 | * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
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| 22 | * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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| 23 | */ |
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| 24 | #include <string.h> |
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| 25 | #include <stdio.h> |
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| 26 | #include <unistd.h> |
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| 27 | |
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| 28 | #include "keybinder.h" |
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| 29 | |
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| 30 | #include "gtk/gtk.h" |
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| 31 | #include "gdk/gdk.h" |
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| 32 | #include "gdk/gdkx.h" |
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| 33 | #include "X11/Xlib.h" |
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| 34 | #include "X11/XKBlib.h" |
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| 35 | |
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| 36 | /* Uncomment the next line to print a debug trace. */ |
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| 37 | /* #define DEBUG */ |
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| 38 | |
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| 39 | #ifdef DEBUG |
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| 40 | # define TRACE(x) x |
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| 41 | #else |
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| 42 | # define TRACE(x) do {} while (FALSE); |
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| 43 | #endif |
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| 44 | |
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| 45 | #define MODIFIERS_ERROR ((GdkModifierType)(-1)) |
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| 46 | #define MODIFIERS_NONE 0 |
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| 47 | |
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| 48 | /* Group to use: Which of configured keyboard Layouts |
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| 49 | * Since grabbing a key blocks its use, we can't grab the corresponding |
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| 50 | * (physical) keys for alternative layouts. |
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| 51 | * |
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| 52 | * Because of this, we interpret all keys relative to the default |
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| 53 | * keyboard layout. |
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| 54 | * |
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| 55 | * For example, if you bind "w", the physical W key will respond to |
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| 56 | * the bound key, even if you switch to a keyboard layout where the W key |
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| 57 | * types a different letter. |
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| 58 | */ |
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| 59 | #define WE_ONLY_USE_ONE_GROUP 0 |
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| 60 | |
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| 61 | |
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| 62 | struct Binding { |
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| 63 | KeybinderHandler handler; |
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| 64 | void *user_data; |
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| 65 | char *keystring; |
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| 66 | /* GDK "distilled" values */ |
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| 67 | guint keyval; |
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| 68 | GdkModifierType modifiers; |
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| 69 | }; |
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| 70 | |
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| 71 | static GSList *bindings = NULL; |
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| 72 | static guint32 last_event_time = 0; |
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| 73 | static gboolean processing_event = FALSE; |
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| 74 | |
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| 75 | /* Return the modifier mask that needs to be pressed to produce key in the |
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| 76 | * given group (keyboard layout) and level ("shift level"). |
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| 77 | */ |
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| 78 | static GdkModifierType |
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| 79 | FinallyGetModifiersForKeycode (XkbDescPtr xkb, |
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| 80 | KeyCode key, |
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| 81 | uint group, |
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| 82 | uint level) |
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| 83 | { |
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| 84 | int nKeyGroups; |
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| 85 | int effectiveGroup; |
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| 86 | XkbKeyTypeRec *type; |
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| 87 | int k; |
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| 88 | |
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| 89 | nKeyGroups = XkbKeyNumGroups(xkb, key); |
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| 90 | if ((!XkbKeycodeInRange(xkb, key)) || (nKeyGroups == 0)) { |
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| 91 | return MODIFIERS_ERROR; |
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| 92 | } |
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| 93 | |
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| 94 | /* Taken from GDK's MyEnhancedXkbTranslateKeyCode */ |
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| 95 | /* find the offset of the effective group */ |
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| 96 | effectiveGroup = group; |
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| 97 | if (effectiveGroup >= nKeyGroups) { |
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| 98 | unsigned groupInfo = XkbKeyGroupInfo(xkb,key); |
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| 99 | switch (XkbOutOfRangeGroupAction(groupInfo)) { |
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| 100 | default: |
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| 101 | effectiveGroup %= nKeyGroups; |
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| 102 | break; |
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| 103 | case XkbClampIntoRange: |
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| 104 | effectiveGroup = nKeyGroups-1; |
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| 105 | break; |
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| 106 | case XkbRedirectIntoRange: |
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| 107 | effectiveGroup = XkbOutOfRangeGroupNumber(groupInfo); |
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| 108 | if (effectiveGroup >= nKeyGroups) |
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| 109 | effectiveGroup = 0; |
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| 110 | break; |
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| 111 | } |
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| 112 | } |
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| 113 | type = XkbKeyKeyType(xkb, key, effectiveGroup); |
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| 114 | for (k = 0; k < type->map_count; k++) { |
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| 115 | if (type->map[k].active && type->map[k].level == level) { |
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| 116 | if (type->preserve) { |
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| 117 | return (type->map[k].mods.mask & |
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| 118 | ~type->preserve[k].mask); |
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| 119 | } else { |
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| 120 | return type->map[k].mods.mask; |
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| 121 | } |
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| 122 | } |
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| 123 | } |
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| 124 | return MODIFIERS_NONE; |
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| 125 | } |
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| 126 | |
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| 127 | /* Grab or ungrab the keycode+modifiers combination, first plainly, and then |
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| 128 | * including each ignorable modifier in turn. |
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| 129 | */ |
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| 130 | static gboolean |
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| 131 | grab_ungrab_with_ignorable_modifiers (GdkWindow *rootwin, |
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| 132 | uint keycode, |
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| 133 | uint modifiers, |
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| 134 | gboolean grab) |
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| 135 | { |
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| 136 | guint i; |
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| 137 | gboolean success = FALSE; |
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| 138 | |
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| 139 | /* Ignorable modifiers */ |
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| 140 | guint mod_masks [] = { |
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| 141 | 0, /* modifier only */ |
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| 142 | GDK_MOD2_MASK, |
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| 143 | GDK_LOCK_MASK, |
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| 144 | GDK_MOD2_MASK | GDK_LOCK_MASK, |
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| 145 | }; |
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| 146 | |
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| 147 | gdk_error_trap_push (); |
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| 148 | |
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| 149 | for (i = 0; i < G_N_ELEMENTS (mod_masks); i++) { |
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| 150 | if (grab) { |
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| 151 | XGrabKey (GDK_WINDOW_XDISPLAY (rootwin), |
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| 152 | keycode, |
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| 153 | modifiers | mod_masks [i], |
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| 154 | GDK_WINDOW_XWINDOW (rootwin), |
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| 155 | False, |
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| 156 | GrabModeAsync, |
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| 157 | GrabModeAsync); |
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| 158 | } else { |
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| 159 | XUngrabKey (GDK_WINDOW_XDISPLAY (rootwin), |
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| 160 | keycode, |
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| 161 | modifiers | mod_masks [i], |
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| 162 | GDK_WINDOW_XWINDOW (rootwin)); |
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| 163 | } |
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| 164 | } |
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| 165 | gdk_flush(); |
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| 166 | if (gdk_error_trap_pop()) { |
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| 167 | TRACE (g_warning ("Failed grab/ungrab")); |
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| 168 | if (grab) { |
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| 169 | /* On error, immediately release keys again */ |
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| 170 | grab_ungrab_with_ignorable_modifiers(rootwin, |
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| 171 | keycode, |
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| 172 | modifiers, |
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| 173 | FALSE); |
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| 174 | } |
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| 175 | } else { |
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| 176 | success = TRUE; |
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| 177 | } |
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| 178 | return success; |
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| 179 | } |
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| 180 | |
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| 181 | /* Grab or ungrab then keyval and modifiers combination, grabbing all key |
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| 182 | * combinations yielding the same key values. |
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| 183 | * Includes ignorable modifiers using grab_ungrab_with_ignorable_modifiers. |
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| 184 | */ |
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| 185 | static gboolean |
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| 186 | grab_ungrab (GdkWindow *rootwin, |
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| 187 | uint keyval, |
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| 188 | uint modifiers, |
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| 189 | gboolean grab) |
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| 190 | { |
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| 191 | int k; |
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| 192 | GdkKeymapKey *keys; |
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| 193 | gint n_keys; |
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| 194 | GdkModifierType add_modifiers; |
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| 195 | XkbDescPtr xmap; |
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| 196 | gboolean success = FALSE; |
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| 197 | |
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| 198 | xmap = XkbGetMap(GDK_WINDOW_XDISPLAY(rootwin), |
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| 199 | XkbAllClientInfoMask, |
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| 200 | XkbUseCoreKbd); |
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| 201 | |
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| 202 | gdk_keymap_get_entries_for_keyval(NULL, keyval, &keys, &n_keys); |
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| 203 | |
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| 204 | if (n_keys == 0) |
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| 205 | return FALSE; |
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| 206 | |
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| 207 | for (k = 0; k < n_keys; k++) { |
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| 208 | /* NOTE: We only bind for the first group, |
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| 209 | * so regardless of current keyboard layout, it will |
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| 210 | * grab the key from the default Layout. |
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| 211 | */ |
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| 212 | if (keys[k].group != WE_ONLY_USE_ONE_GROUP) { |
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| 213 | continue; |
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| 214 | } |
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| 215 | |
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| 216 | add_modifiers = FinallyGetModifiersForKeycode(xmap, |
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| 217 | keys[k].keycode, |
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| 218 | keys[k].group, |
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| 219 | keys[k].level); |
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| 220 | |
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| 221 | if (add_modifiers == MODIFIERS_ERROR) { |
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| 222 | continue; |
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| 223 | } |
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| 224 | TRACE (g_print("grab/ungrab keycode: %d, lev: %d, grp: %d, ", |
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| 225 | keys[k].keycode, keys[k].level, keys[k].group)); |
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| 226 | TRACE (g_print("modifiers: 0x%x (consumed: 0x%x)\n", |
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| 227 | add_modifiers | modifiers, add_modifiers)); |
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| 228 | if (grab_ungrab_with_ignorable_modifiers(rootwin, |
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| 229 | keys[k].keycode, |
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| 230 | add_modifiers | modifiers, |
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| 231 | grab)) { |
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| 232 | |
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| 233 | success = TRUE; |
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| 234 | } else { |
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| 235 | /* When grabbing, break on error */ |
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| 236 | if (grab && !success) { |
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| 237 | break; |
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| 238 | } |
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| 239 | } |
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| 240 | |
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| 241 | } |
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| 242 | g_free(keys); |
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| 243 | XkbFreeClientMap(xmap, 0, TRUE); |
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| 244 | |
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| 245 | return success; |
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| 246 | } |
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| 247 | |
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| 248 | static gboolean |
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| 249 | keyvalues_equal (guint kv1, guint kv2) |
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| 250 | { |
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| 251 | return kv1 == kv2; |
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| 252 | } |
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| 253 | |
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| 254 | /* Compare modifier set equality, |
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| 255 | * while accepting overloaded modifiers (MOD1 and META together) |
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| 256 | */ |
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| 257 | static gboolean |
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| 258 | modifiers_equal (GdkModifierType mf1, GdkModifierType mf2) |
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| 259 | { |
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| 260 | GdkModifierType ignored = 0; |
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| 261 | |
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| 262 | /* Accept MOD1 + META as MOD1 */ |
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| 263 | if (mf1 & mf2 & GDK_MOD1_MASK) { |
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| 264 | ignored |= GDK_META_MASK; |
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| 265 | } |
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| 266 | /* Accept SUPER + HYPER as SUPER */ |
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| 267 | if (mf1 & mf2 & GDK_SUPER_MASK) { |
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| 268 | ignored |= GDK_HYPER_MASK; |
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| 269 | } |
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| 270 | if ((mf1 & ~ignored) == (mf2 & ~ignored)) { |
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| 271 | return TRUE; |
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| 272 | } |
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| 273 | return FALSE; |
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| 274 | } |
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| 275 | |
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| 276 | static gboolean |
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| 277 | do_grab_key (struct Binding *binding) |
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| 278 | { |
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| 279 | gboolean success; |
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| 280 | GdkWindow *rootwin = gdk_get_default_root_window (); |
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| 281 | GdkKeymap *keymap = gdk_keymap_get_default (); |
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| 282 | |
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| 283 | |
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| 284 | GdkModifierType modifiers; |
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| 285 | guint keysym = 0; |
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| 286 | |
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| 287 | if (keymap == NULL || rootwin == NULL) |
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| 288 | return FALSE; |
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| 289 | |
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| 290 | gtk_accelerator_parse(binding->keystring, &keysym, &modifiers); |
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| 291 | |
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| 292 | if (keysym == 0) |
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| 293 | return FALSE; |
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| 294 | |
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| 295 | binding->keyval = keysym; |
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| 296 | binding->modifiers = modifiers; |
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| 297 | TRACE (g_print ("Grabbing keyval: %d, vmodifiers: 0x%x, name: %s\n", |
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| 298 | keysym, modifiers, binding->keystring)); |
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| 299 | |
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| 300 | /* Map virtual modifiers to non-virtual modifiers */ |
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| 301 | gdk_keymap_map_virtual_modifiers(keymap, &modifiers); |
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| 302 | |
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| 303 | if (modifiers == binding->modifiers && |
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| 304 | (GDK_SUPER_MASK | GDK_HYPER_MASK | GDK_META_MASK) & modifiers) { |
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| 305 | g_warning ("Failed to map virtual modifiers"); |
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| 306 | return FALSE; |
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| 307 | } |
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| 308 | |
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| 309 | success = grab_ungrab (rootwin, keysym, modifiers, TRUE /* grab */); |
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| 310 | |
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| 311 | if (!success) { |
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| 312 | g_warning ("Binding '%s' failed!", binding->keystring); |
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| 313 | } |
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| 314 | |
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| 315 | return success; |
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| 316 | } |
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| 317 | |
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| 318 | static gboolean |
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| 319 | do_ungrab_key (struct Binding *binding) |
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| 320 | { |
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| 321 | GdkKeymap *keymap = gdk_keymap_get_default (); |
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| 322 | GdkWindow *rootwin = gdk_get_default_root_window (); |
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| 323 | GdkModifierType modifiers; |
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| 324 | |
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| 325 | if (keymap == NULL || rootwin == NULL) |
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| 326 | return FALSE; |
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| 327 | |
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| 328 | TRACE (g_print ("Ungrabbing keyval: %d, vmodifiers: 0x%x, name: %s\n", |
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| 329 | binding->keyval, binding->modifiers, binding->keystring)); |
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| 330 | |
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| 331 | /* Map virtual modifiers to non-virtual modifiers */ |
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| 332 | modifiers = binding->modifiers; |
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| 333 | gdk_keymap_map_virtual_modifiers(keymap, &modifiers); |
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| 334 | |
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| 335 | grab_ungrab (rootwin, binding->keyval, modifiers, FALSE /* ungrab */); |
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| 336 | return TRUE; |
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| 337 | } |
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| 338 | |
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| 339 | static GdkFilterReturn |
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| 340 | filter_func (GdkXEvent *gdk_xevent, GdkEvent *event, gpointer data) |
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| 341 | { |
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| 342 | XEvent *xevent = (XEvent *) gdk_xevent; |
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| 343 | GdkKeymap *keymap = gdk_keymap_get_default(); |
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| 344 | guint keyval; |
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| 345 | GdkModifierType consumed, modifiers; |
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| 346 | guint mod_mask = gtk_accelerator_get_default_mod_mask(); |
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| 347 | GSList *iter; |
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| 348 | |
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| 349 | (void) event; |
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| 350 | (void) data; |
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| 351 | |
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| 352 | switch (xevent->type) { |
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| 353 | case KeyPress: |
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| 354 | modifiers = xevent->xkey.state; |
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| 355 | |
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| 356 | TRACE (g_print ("Got KeyPress keycode: %d, modifiers: 0x%x\n", |
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| 357 | xevent->xkey.keycode, |
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| 358 | xevent->xkey.state)); |
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| 359 | |
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| 360 | gdk_keymap_translate_keyboard_state( |
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| 361 | keymap, |
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| 362 | xevent->xkey.keycode, |
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| 363 | modifiers, |
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| 364 | /* See top comment why we don't use this here: |
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| 365 | XkbGroupForCoreState (xevent->xkey.state) |
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| 366 | */ |
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| 367 | WE_ONLY_USE_ONE_GROUP, |
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| 368 | &keyval, NULL, NULL, &consumed); |
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| 369 | |
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| 370 | /* Map non-virtual to virtual modifiers */ |
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| 371 | modifiers &= ~consumed; |
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| 372 | gdk_keymap_add_virtual_modifiers(keymap, &modifiers); |
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| 373 | modifiers &= mod_mask; |
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| 374 | |
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| 375 | TRACE (g_print ("Translated keyval: %d, vmodifiers: 0x%x, name: %s\n", |
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| 376 | keyval, modifiers, |
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| 377 | gtk_accelerator_name(keyval, modifiers))); |
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| 378 | |
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| 379 | /* |
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| 380 | * Set the last event time for use when showing |
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| 381 | * windows to avoid anti-focus-stealing code. |
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| 382 | */ |
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| 383 | processing_event = TRUE; |
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| 384 | last_event_time = xevent->xkey.time; |
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| 385 | |
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| 386 | for (iter = bindings; iter != NULL; iter = iter->next) { |
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| 387 | struct Binding *binding = iter->data; |
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| 388 | |
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| 389 | if (keyvalues_equal(binding->keyval, keyval) && |
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| 390 | modifiers_equal(binding->modifiers, modifiers)) { |
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| 391 | TRACE (g_print ("Calling handler for '%s'...\n", |
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| 392 | binding->keystring)); |
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| 393 | |
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| 394 | (binding->handler) (binding->keystring, |
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| 395 | binding->user_data); |
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| 396 | } |
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| 397 | } |
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| 398 | |
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| 399 | processing_event = FALSE; |
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| 400 | break; |
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| 401 | case KeyRelease: |
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| 402 | TRACE (g_print ("Got KeyRelease! \n")); |
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| 403 | break; |
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| 404 | } |
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| 405 | |
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| 406 | return GDK_FILTER_CONTINUE; |
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| 407 | } |
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| 408 | |
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| 409 | static void |
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| 410 | keymap_changed (GdkKeymap *map) |
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| 411 | { |
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| 412 | GSList *iter; |
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| 413 | |
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| 414 | (void) map; |
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| 415 | |
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| 416 | TRACE (g_print ("Keymap changed! Regrabbing keys...")); |
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| 417 | |
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| 418 | for (iter = bindings; iter != NULL; iter = iter->next) { |
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| 419 | struct Binding *binding = iter->data; |
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| 420 | do_ungrab_key (binding); |
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| 421 | } |
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| 422 | |
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| 423 | for (iter = bindings; iter != NULL; iter = iter->next) { |
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| 424 | struct Binding *binding = iter->data; |
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| 425 | do_grab_key (binding); |
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| 426 | } |
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| 427 | } |
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| 428 | |
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| 429 | void |
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| 430 | keybinder_init () |
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| 431 | { |
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| 432 | GdkKeymap *keymap = gdk_keymap_get_default (); |
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| 433 | GdkWindow *rootwin = gdk_get_default_root_window (); |
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| 434 | |
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| 435 | gdk_window_add_filter (rootwin, filter_func, NULL); |
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| 436 | |
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| 437 | /* Workaround: Make sure modmap is up to date |
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| 438 | * There is possibly a bug in GTK+ where virtual modifiers are not |
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| 439 | * mapped because the modmap is not updated. The following function |
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| 440 | * updates it. |
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| 441 | */ |
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| 442 | (void) gdk_keymap_have_bidi_layouts(keymap); |
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| 443 | |
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| 444 | |
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| 445 | g_signal_connect (keymap, |
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| 446 | "keys_changed", |
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| 447 | G_CALLBACK (keymap_changed), |
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| 448 | NULL); |
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| 449 | } |
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| 450 | |
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| 451 | gboolean |
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| 452 | keybinder_bind (const char *keystring, |
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| 453 | KeybinderHandler handler, |
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| 454 | void *user_data) |
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| 455 | { |
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| 456 | struct Binding *binding; |
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| 457 | gboolean success; |
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| 458 | |
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| 459 | binding = g_new0 (struct Binding, 1); |
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| 460 | binding->keystring = g_strdup (keystring); |
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| 461 | binding->handler = handler; |
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| 462 | binding->user_data = user_data; |
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| 463 | |
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| 464 | /* Sets the binding's keycode and modifiers */ |
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| 465 | success = do_grab_key (binding); |
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| 466 | |
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| 467 | if (success) { |
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| 468 | bindings = g_slist_prepend (bindings, binding); |
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| 469 | } else { |
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| 470 | g_free (binding->keystring); |
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| 471 | g_free (binding); |
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| 472 | } |
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| 473 | return success; |
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| 474 | } |
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| 475 | |
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| 476 | void |
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| 477 | keybinder_unbind (const char *keystring, KeybinderHandler handler) |
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| 478 | { |
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| 479 | GSList *iter; |
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| 480 | |
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| 481 | for (iter = bindings; iter != NULL; iter = iter->next) { |
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| 482 | struct Binding *binding = iter->data; |
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| 483 | |
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| 484 | if (strcmp (keystring, binding->keystring) != 0 || |
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| 485 | handler != binding->handler) |
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| 486 | continue; |
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| 487 | |
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| 488 | do_ungrab_key (binding); |
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| 489 | |
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| 490 | bindings = g_slist_remove (bindings, binding); |
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| 491 | |
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| 492 | g_free (binding->keystring); |
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| 493 | g_free (binding); |
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| 494 | break; |
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| 495 | } |
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| 496 | } |
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| 497 | |
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| 498 | guint32 |
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| 499 | keybinder_get_current_event_time (void) |
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| 500 | { |
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| 501 | if (processing_event) |
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| 502 | return last_event_time; |
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| 503 | else |
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| 504 | return GDK_CURRENT_TIME; |
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| 505 | } |
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