keybindings: Implement on-release bindings

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>

doc/rofi-manpage.markdown

@@ -704,6 +704,8 @@ The first two fields specify the alpha level. This determines the amount of tran
 To get a full list of keybindings, see `rofi -dump-xresources | grep kb-`.
 Keybindings can be modified using the configuration systems.
 
+A keybinding starting with `!` will act when all keys have been released.
+
 ## Available Modi
 
 ### Window

doc/rofi.1

@@ -1160,6 +1160,9 @@ The first two fields specify the alpha level\. This determines the amount of tra
 .P
 To get a full list of keybindings, see \fBrofi \-dump\-xresources | grep kb\-\fR\. Keybindings can be modified using the configuration systems\.
 .
+.P
+A keybinding starting with \fB!\fR will act when all keys have been released\.
+.
 .SH "Available Modi"
 .
 .SS "Window"

include/keyb.h

@@ -100,5 +100,7 @@ void cleanup_abe ( void );
  */
 KeyBindingAction abe_find_action ( unsigned int mask, xkb_keysym_t key );
 
+void abe_trigger_release ( void );
+
 /*@}*/
 #endif // ROFI_KEYB_H

include/x11-helper.h

@@ -81,6 +81,8 @@ int take_keyboard ( xcb_window_t w );
  */
 unsigned int x11_canonalize_mask ( unsigned int mask );
 
+unsigned int x11_get_current_mask ( xkb_stuff *xkb );
+
 /**
  * @param combo String representing the key combo
  * @param mod [out]  The modifier specified (or AnyModifier if not specified)
@@ -88,7 +90,7 @@ unsigned int x11_canonalize_mask ( unsigned int mask );
  *
  * Parse key from user input string.
  */
-gboolean x11_parse_key ( char *combo, unsigned int *mod, xkb_keysym_t *key );
+gboolean x11_parse_key ( char *combo, unsigned int *mod, xkb_keysym_t *key, gboolean *release );
 
 /**
  * @param display The connection to the X server.

source/keyb.c

@@ -8,6 +8,7 @@ typedef struct
 {
     unsigned int modmask;
     xkb_keysym_t keysym;
+    gboolean     release;
 } KeyBinding;
 
 typedef struct
@@ -114,7 +115,8 @@ gboolean parse_keys_abe ( void )
         for ( char *entry = strtok_r ( keystr, sep, &sp ); entry != NULL; entry = strtok_r ( NULL, sep, &sp ) ) {
             abe[iter].kb = g_realloc ( abe[iter].kb, ( abe[iter].num_bindings + 1 ) * sizeof ( KeyBinding ) );
             KeyBinding *kb = &( abe[iter].kb[abe[iter].num_bindings] );
-            if ( !x11_parse_key ( entry, &( kb->modmask ), &( kb->keysym ) ) ) {
+            memset(kb, 0, sizeof(KeyBinding));
+            if ( !x11_parse_key ( entry, &( kb->modmask ), &( kb->keysym ), &( kb->release ) ) ) {
                 g_free ( keystr );
                 return FALSE;
             }
@@ -135,6 +137,8 @@ void cleanup_abe ( void )
     }
 }
 
+static gboolean _abe_trigger_on_release[NUM_ABE] = { 0 };
+
 static gboolean abe_test_action ( KeyBindingAction action, unsigned int mask, xkb_keysym_t key )
 {
     ActionBindingEntry *akb = &( abe[action] );
@@ -142,13 +146,19 @@ static gboolean abe_test_action ( KeyBindingAction action, unsigned int mask, xk
     for ( int iter = 0; iter < akb->num_bindings; iter++ ) {
         const KeyBinding * const kb = &( akb->kb[iter] );
         if ( ( kb->keysym == key ) && ( kb->modmask == mask ) ) {
+            if ( kb->release ) {
+                _abe_trigger_on_release[action] = TRUE;
+            }
+            else {
                 return TRUE;
             }
         }
+    }
 
     return FALSE;
 }
 
+
 KeyBindingAction abe_find_action ( unsigned int mask, xkb_keysym_t key )
 {
     KeyBindingAction action;
@@ -161,3 +171,19 @@ KeyBindingAction abe_find_action ( unsigned int mask, xkb_keysym_t key )
 
     return action;
 }
+
+void abe_trigger_release ( void )
+{
+    RofiViewState *state;
+    KeyBindingAction action;
+
+    state = rofi_view_get_active ( );
+    for ( action = 0 ; action < NUM_ABE ; ++action ) {
+        if ( _abe_trigger_on_release[action] ) {
+            rofi_view_trigger_action ( state, action );
+            _abe_trigger_on_release[action] = FALSE;
+        }
+    }
+
+    rofi_view_update ( state );
+}

source/rofi.c

@@ -439,6 +439,7 @@ static gboolean main_loop_x11_event_handler ( xcb_generic_event_t *ev, G_GNUC_UN
         case XCB_XKB_STATE_NOTIFY:
         {
             xcb_xkb_state_notify_event_t *ksne = (xcb_xkb_state_notify_event_t *) ev;
+            guint modmask;
             xkb_state_update_mask ( xkb.state,
                                     ksne->baseMods,
                                     ksne->latchedMods,
@@ -446,6 +447,10 @@ static gboolean main_loop_x11_event_handler ( xcb_generic_event_t *ev, G_GNUC_UN
                                     ksne->baseGroup,
                                     ksne->latchedGroup,
                                     ksne->lockedGroup );
+            modmask = x11_get_current_mask ( &xkb );
+            if ( modmask == 0 ) {
+                abe_trigger_release ( );
+            }
             break;
         }
         }

source/view.c

@@ -550,8 +550,8 @@ void __create_window ( MenuFlags menu_flags )
         0,
         0,
         XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_BUTTON_PRESS | XCB_EVENT_MASK_BUTTON_RELEASE |
-        XCB_EVENT_MASK_KEY_PRESS | XCB_EVENT_MASK_KEY_RELEASE | XCB_EVENT_MASK_STRUCTURE_NOTIFY |
-        XCB_EVENT_MASK_FOCUS_CHANGE | XCB_EVENT_MASK_BUTTON_1_MOTION,
+        XCB_EVENT_MASK_KEY_PRESS | XCB_EVENT_MASK_KEY_RELEASE | XCB_EVENT_MASK_KEYMAP_STATE |
+        XCB_EVENT_MASK_STRUCTURE_NOTIFY | XCB_EVENT_MASK_FOCUS_CHANGE | XCB_EVENT_MASK_BUTTON_1_MOTION,
         map
     };
 
@@ -1542,9 +1542,33 @@ static void rofi_view_mainloop_iter ( RofiViewState *state, xcb_generic_event_t
     case XCB_SELECTION_NOTIFY:
         rofi_view_paste ( state, (xcb_selection_notify_event_t *) ev );
         break;
+    case XCB_KEYMAP_NOTIFY:
+    {
+        xcb_keymap_notify_event_t *kne = (xcb_keymap_notify_event_t *) ev;
+        guint modstate = x11_get_current_mask ( xkb );
+        for ( gint32 by = 0 ; by < 32 ; ++by ) {
+            for ( gint8 bi = 0 ; bi < 7 ; ++bi ) {
+                if ( kne->keys[by] & (1 << bi) ) {
+                    // X11 keycodes starts at 8
+                    xkb_keysym_t key = xkb_state_key_get_one_sym ( xkb->state, ( 8 * by + bi ) + 8 );
+                    abe_find_action ( modstate, key );
+                }
+            }
+        }
+        break;
+    }
     case XCB_KEY_PRESS:
         rofi_view_handle_keypress ( state, xkb, (xcb_key_press_event_t *) ev );
         break;
+    case XCB_KEY_RELEASE:
+    {
+        xcb_key_release_event_t *xkre = (xcb_key_release_event_t *) ev;
+        unsigned int modstate = x11_canonalize_mask ( xkre->state );
+        if ( modstate == 0 ) {
+            abe_trigger_release ( );
+        }
+        break;
+    }
     }
     // Update if requested.
     if ( state->refilter ) {

source/x11-helper.c

@@ -437,12 +437,28 @@ unsigned int x11_canonalize_mask ( unsigned int mask )
     return mask;
 }
 
+unsigned int x11_get_current_mask ( xkb_stuff *xkb )
+{
+    unsigned int mask = 0;
+    for ( gsize i = 0 ; i < xkb_keymap_num_mods(xkb->keymap) ; ++i ) {
+        if ( xkb_state_mod_index_is_active ( xkb->state, i, XKB_STATE_MODS_EFFECTIVE ) ) {
+            mask |= ( 1 << i );
+        }
+    }
+    return x11_canonalize_mask ( mask );
+}
+
 // convert a Mod+key arg to mod mask and keysym
-gboolean x11_parse_key ( char *combo, unsigned int *mod, xkb_keysym_t *key )
+gboolean x11_parse_key ( char *combo, unsigned int *mod, xkb_keysym_t *key, gboolean *release )
 {
     GString      *str    = g_string_new ( "" );
     unsigned int modmask = 0;
 
+    if ( g_str_has_prefix(combo, "!") ) {
+        ++combo;
+        *release = TRUE;
+    }
+
     if ( strcasestr ( combo, "shift" ) ) {
         modmask |= x11_mod_masks[X11MOD_SHIFT];
         if ( x11_mod_masks[X11MOD_SHIFT] == 0 ) {