From: Jonathan Neuschäfer Date: Sat, 24 Dec 2011 17:28:05 +0000 (+0100) Subject: screen_keydef: rework the list length / item position logic X-Git-Tag: release-0.20~19 X-Git-Url: https://git.tokkee.org/?a=commitdiff_plain;h=c103d47003d4773727cd56bc2fe392f6e148ebd1;p=ncmpc.git screen_keydef: rework the list length / item position logic --- diff --git a/src/screen_keydef.c b/src/screen_keydef.c index 6ed3e33..8174c04 100644 --- a/src/screen_keydef.c +++ b/src/screen_keydef.c @@ -31,27 +31,60 @@ #include #include -#define STATIC_ITEMS 0 -#define STATIC_SUB_ITEMS 1 +static struct list_window *lw; -#define LIST_ITEM_APPLY() ((unsigned)command_list_length) -#define LIST_ITEM_SAVE() (LIST_ITEM_APPLY()+1) -#define LIST_LENGTH() (LIST_ITEM_SAVE()+1) +static command_definition_t *cmds = NULL; +/** the number of commands */ +static unsigned command_n_commands = 0; -static struct list_window *lw; -static unsigned command_list_length = 0; -static command_definition_t *cmds = NULL; +/** + * the position of the "apply" item. It's the same as command_n_commands, + * because array subscripts start at 0, while numbers of items start at 1. + */ +#define command_item_apply (command_n_commands) + +/** the position of the "apply and save" item */ +#define command_item_save (command_item_apply + 1) +/** the number of items on the "command" view */ +#define command_length (command_item_save + 1) + + +/** + * The command being edited, represented by a array subscript to @cmds, or -1, + * if no command is being edited + */ static int subcmd = -1; -static unsigned subcmd_length = 0; -static unsigned subcmd_addpos = 0; + +/** The number of keys assigned to the current command */ +static unsigned subcmd_n_keys = 0; + +/** The position of the up ("[..]") item */ +#define subcmd_item_up 0 + +/** The position of the "add a key" item */ +#define subcmd_item_add (subcmd_n_keys + 1) + +/** The number of items in the list_window, if there's a command being edited */ +#define subcmd_length (subcmd_item_add + 1) + +/** Check whether a given item is a key */ +#define subcmd_item_is_key(i) \ + ((i) > subcmd_item_up && (i) < subcmd_item_add) + +/** + * Convert an item id (as in lw->selected) into a "key id", which is an array + * subscript to cmds[subcmd].keys. + */ +#define subcmd_item_to_key_id(i) ((i) - 1) + static int keybindings_changed(void) { command_definition_t *orginal_cmds = get_command_definitions(); - size_t size = command_list_length * sizeof(command_definition_t); + size_t size = command_n_commands * sizeof(command_definition_t); return memcmp(orginal_cmds, cmds, size); } @@ -61,7 +94,7 @@ apply_keys(void) { if (keybindings_changed()) { command_definition_t *orginal_cmds = get_command_definitions(); - size_t size = command_list_length * sizeof(command_definition_t); + size_t size = command_n_commands * sizeof(command_definition_t); memcpy(orginal_cmds, cmds, size); screen_status_printf(_("You have new key bindings")); @@ -100,20 +133,19 @@ save_keys(void) return fclose(f); } +/* TODO: rename to check_n_keys / subcmd_count_keys? */ static void check_subcmd_length(void) { - subcmd_length = 0; - while (subcmd_length < MAX_COMMAND_KEYS && - cmds[subcmd].keys[subcmd_length] > 0) - ++subcmd_length; - - if (subcmd_length < MAX_COMMAND_KEYS) { - subcmd_addpos = subcmd_length; - subcmd_length++; - } else - subcmd_addpos = 0; - subcmd_length += STATIC_SUB_ITEMS; + unsigned i; + + /* this loops counts the continous valid keys at the start of the the keys + array, so make sure you don't have gaps */ + for (i = 0; i < MAX_COMMAND_KEYS; i++) + if (cmds[subcmd].keys[i] == 0) + break; + subcmd_n_keys = i; + list_window_set_length(lw, subcmd_length); } @@ -201,32 +233,31 @@ list_callback(unsigned idx, G_GNUC_UNUSED void *data) { static char buf[256]; - if (subcmd < 0) { - if (idx == LIST_ITEM_APPLY()) + if (subcmd == -1) { + if (idx == command_item_apply) return _("===> Apply key bindings "); - else if (idx == LIST_ITEM_SAVE()) + if (idx == command_item_save) return _("===> Apply & Save key bindings "); - assert(idx < (unsigned)command_list_length); + assert(idx < (unsigned) command_n_commands); return cmds[idx].name; } else { - if (idx == 0) + if (idx == subcmd_item_up) return "[..]"; - idx--; - if (idx == subcmd_addpos) { + + if (idx == subcmd_item_add) { g_snprintf(buf, sizeof(buf), "%d. %s", - idx + 1, _("Add new key")); + idx, _("Add new key")); return buf; } - assert(idx < MAX_COMMAND_KEYS && cmds[subcmd].keys[idx] > 0); + assert(subcmd_item_is_key(idx)); g_snprintf(buf, sizeof(buf), - "%d. %-20s (%d) ", - idx + 1, - key2str(cmds[subcmd].keys[idx]), - cmds[subcmd].keys[idx]); + "%d. %-20s (%d) ", idx, + key2str(cmds[subcmd].keys[subcmd_item_to_key_id(idx)]), + cmds[subcmd].keys[subcmd_item_to_key_id(idx)]); return buf; } } @@ -260,18 +291,18 @@ keydef_open(G_GNUC_UNUSED struct mpdclient *c) command_definition_t *current_cmds = get_command_definitions(); size_t cmds_size; - command_list_length = 0; - while (current_cmds[command_list_length].name) - command_list_length++; + command_n_commands = 0; + while (current_cmds[command_n_commands].name) + command_n_commands++; - cmds_size = (command_list_length+1) * sizeof(command_definition_t); + /* +1 for the terminator element */ + cmds_size = (command_n_commands + 1) * sizeof(command_definition_t); cmds = g_malloc0(cmds_size); memcpy(cmds, current_cmds, cmds_size); - command_list_length += STATIC_ITEMS; } subcmd = -1; - list_window_set_length(lw, LIST_LENGTH()); + list_window_set_length(lw, command_length); } static void @@ -287,7 +318,7 @@ keydef_close(void) static const char * keydef_title(char *str, size_t size) { - if (subcmd < 0) + if (subcmd == -1) return _("Edit key bindings"); g_snprintf(str, size, _("Edit keys for %s"), cmds[subcmd].name); @@ -313,10 +344,10 @@ keydef_cmd(G_GNUC_UNUSED struct mpdclient *c, command_t cmd) switch(cmd) { case CMD_PLAY: - if (subcmd < 0) { - if (lw->selected == LIST_ITEM_APPLY()) + if (subcmd == -1) { + if (lw->selected == command_item_apply) { apply_keys(); - else if (lw->selected == LIST_ITEM_SAVE()) { + } else if (lw->selected == command_item_save) { apply_keys(); save_keys(); } else { @@ -327,20 +358,22 @@ keydef_cmd(G_GNUC_UNUSED struct mpdclient *c, command_t cmd) keydef_repaint(); } } else { - if (lw->selected == 0) { /* up */ - list_window_set_length(lw, LIST_LENGTH()); + if (lw->selected == subcmd_item_up) { + list_window_set_length(lw, command_length); list_window_set_cursor(lw, subcmd); subcmd = -1; keydef_repaint(); - } else - assign_new_key(subcmd, - lw->selected - STATIC_SUB_ITEMS); + } else { + /* TODO: subcmd_item_add should be handled + separately, just for clarity */ + assign_new_key(subcmd, subcmd_item_to_key_id(lw->selected)); + } } return true; case CMD_GO_PARENT_DIRECTORY: - if (subcmd >=0) { - list_window_set_length(lw, LIST_LENGTH()); + if (subcmd != -1) { + list_window_set_length(lw, command_length); list_window_set_cursor(lw, subcmd); subcmd = -1; @@ -348,8 +381,9 @@ keydef_cmd(G_GNUC_UNUSED struct mpdclient *c, command_t cmd) } return true; case CMD_DELETE: - if (subcmd >= 0 && lw->selected >= STATIC_SUB_ITEMS) - delete_key(subcmd, lw->selected - STATIC_SUB_ITEMS); + if (subcmd != -1 && subcmd_item_is_key(lw->selected)) + delete_key(subcmd, subcmd_item_to_key_id(lw->selected)); + return true; case CMD_SAVE_PLAYLIST: apply_keys();