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97 lines
3.1 KiB
C
97 lines
3.1 KiB
C
/* keytree.h - Trie (prefix tree) for key-chain bindings
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*
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* Window Maker window manager
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*
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* Copyright (c) 2026 Window Maker Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef WMKEYTREE_H
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#define WMKEYTREE_H
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#include <X11/Xlib.h>
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/*
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* Each key in a binding sequence occupies one node in the trie.
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* Internal nodes (first_child != NULL) represent a prefix that has been
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* typed so far, leaf nodes carry the action payload.
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*/
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typedef enum {
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WKN_WKBD, /* action: wKeyBindings command (WKBD_* index) */
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WKN_MENU /* action: root-menu entry callback */
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} WKeyActionType;
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/*
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* A single action attached to a trie leaf node. Multiple actions may share
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* the same key sequence and are chained through the 'next' pointer, allowing
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* one key press to trigger several commands simultaneously.
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*/
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typedef struct WKeyAction {
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WKeyActionType type;
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union {
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int wkbd_idx; /* WKN_WKBD: WKBD_* enum value */
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struct {
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void *menu; /* WKN_MENU: cast to WMenu */
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void *entry; /* WKN_MENU: cast to WMenuEntry */
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} menu;
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} u;
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struct WKeyAction *next; /* next action for this key sequence, or NULL */
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} WKeyAction;
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typedef struct WKeyNode {
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unsigned int modifier;
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KeyCode keycode;
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WKeyAction *actions; /* non-NULL only for leaf nodes (first_child == NULL) */
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struct WKeyNode *parent;
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struct WKeyNode *first_child; /* first key of next step in chain */
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struct WKeyNode *next_sibling; /* alternative binding at same depth */
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} WKeyNode;
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/* Global trie root */
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extern WKeyNode *wKeyTreeRoot;
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/*
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* Insert a key sequence into *root.
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* mods[0]/keys[0] - root (leader) key
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* mods[1..n-1]/keys[1..n-1] - follower keys
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* Shared prefixes are merged automatically.
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* Returns the leaf node (caller must set its type/payload).
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* Returns NULL if nkeys <= 0.
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*/
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WKeyNode *wKeyTreeInsert(WKeyNode **root, unsigned int *mods, KeyCode *keys, int nkeys);
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/*
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* Find the first sibling in the list starting at 'siblings' that matches
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* (mod, key). Returns NULL if not found.
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*/
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WKeyNode *wKeyTreeFind(WKeyNode *siblings, unsigned int mod, KeyCode key);
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/*
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* Recursively free the entire subtree rooted at 'node'.
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*/
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void wKeyTreeDestroy(WKeyNode *node);
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/*
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* Allocate a new WKeyAction of the given type, append it to leaf->actions,
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* and return it for the caller to set the payload (wkbd_idx or menu.*).
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* Multiple calls with the same leaf accumulate actions in insertion order.
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*/
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WKeyAction *wKeyNodeAddAction(WKeyNode *leaf, WKeyActionType type);
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#endif /* WMKEYTREE_H */
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