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Diffstat (limited to '')
| -rw-r--r-- | lib/widget/widget-common.c | 898 |
1 files changed, 898 insertions, 0 deletions
diff --git a/lib/widget/widget-common.c b/lib/widget/widget-common.c new file mode 100644 index 0000000..bc36e6d --- /dev/null +++ b/lib/widget/widget-common.c @@ -0,0 +1,898 @@ +/* + Widgets for the Midnight Commander + + Copyright (C) 1994-2022 + Free Software Foundation, Inc. + + Authors: + Radek Doulik, 1994, 1995 + Miguel de Icaza, 1994, 1995 + Jakub Jelinek, 1995 + Andrej Borsenkow, 1996 + Norbert Warmuth, 1997 + Andrew Borodin <aborodin@vmail.ru>, 2009-2022 + + This file is part of the Midnight Commander. + + The Midnight Commander is free software: you can redistribute it + and/or modify it under the terms of the GNU General Public License as + published by the Free Software Foundation, either version 3 of the License, + or (at your option) any later version. + + The Midnight Commander is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +/** \file widget-common.c + * \brief Source: shared stuff of widgets + */ + +#include <config.h> + +#include <stdlib.h> +#include <string.h> + +#include "lib/global.h" + +#include "lib/tty/tty.h" +#include "lib/tty/color.h" +#include "lib/skin.h" +#include "lib/strutil.h" +#include "lib/widget.h" + +/*** global variables ****************************************************************************/ + +/*** file scope macro definitions ****************************************************************/ + +/*** file scope type declarations ****************************************************************/ + +/*** file scope variables ************************************************************************/ + +/* maximum value of used widget ID */ +static unsigned long widget_id = 0; + +/* --------------------------------------------------------------------------------------------- */ +/*** file scope functions ************************************************************************/ +/* --------------------------------------------------------------------------------------------- */ + +/** + * Calc widget ID, + * Widget ID is uniq for each widget created during MC session (like PID in OS). + * + * @return widget ID. + */ +static unsigned long +widget_set_id (void) +{ + unsigned long id; + + id = widget_id++; + /* TODO IF NEEDED: if id is already used, find next free id. */ + + return id; +} + +/* --------------------------------------------------------------------------------------------- */ + +static cb_ret_t +widget_default_resize (Widget * w, const WRect * r) +{ + if (r == NULL) + return MSG_NOT_HANDLED; + + w->rect = *r; + + return MSG_HANDLED; +} + +/* --------------------------------------------------------------------------------------------- */ + +static void +widget_do_focus (Widget * w, gboolean enable) +{ + if (w != NULL && widget_get_state (WIDGET (w->owner), WST_VISIBLE | WST_FOCUSED)) + widget_set_state (w, WST_FOCUSED, enable); +} + +/* --------------------------------------------------------------------------------------------- */ +/** + * Focus specified widget in it's owner. + * + * @param w widget to be focused. + */ + +static void +widget_focus (Widget * w) +{ + WGroup *g = w->owner; + + if (g == NULL) + return; + + if (WIDGET (g->current->data) != w) + { + widget_do_focus (WIDGET (g->current->data), FALSE); + /* Test if focus lost was allowed and focus has really been loose */ + if (g->current == NULL || !widget_get_state (WIDGET (g->current->data), WST_FOCUSED)) + { + widget_do_focus (w, TRUE); + g->current = widget_find (WIDGET (g), w); + } + } + else if (!widget_get_state (w, WST_FOCUSED)) + widget_do_focus (w, TRUE); +} + +/* --------------------------------------------------------------------------------------------- */ + +/** + * Put widget on top or bottom of Z-order. + */ +static void +widget_reorder (GList * l, gboolean set_top) +{ + WGroup *g = WIDGET (l->data)->owner; + + g->widgets = g_list_remove_link (g->widgets, l); + if (set_top) + g->widgets = g_list_concat (g->widgets, l); + else + g->widgets = g_list_concat (l, g->widgets); +} + +/* --------------------------------------------------------------------------------------------- */ + +static gboolean +hotkey_cmp (const char *s1, const char *s2) +{ + gboolean n1, n2; + + n1 = s1 != NULL; + n2 = s2 != NULL; + + if (n1 != n2) + return FALSE; + + if (n1 && n2 && strcmp (s1, s2) != 0) + return FALSE; + + return TRUE; +} + +/* --------------------------------------------------------------------------------------------- */ + +static void +widget_default_mouse_callback (Widget * w, mouse_msg_t msg, mouse_event_t * event) +{ + /* do nothing */ + (void) w; + (void) msg; + (void) event; +} + +/* --------------------------------------------------------------------------------------------- */ + +static const int * +widget_default_get_colors (const Widget * w) +{ + const Widget *owner = CONST_WIDGET (w->owner); + + return (owner == NULL ? NULL : widget_get_colors (owner)); +} + +/* --------------------------------------------------------------------------------------------- */ +/*** public functions ****************************************************************************/ +/* --------------------------------------------------------------------------------------------- */ + +struct hotkey_t +hotkey_new (const char *text) +{ + hotkey_t result; + const char *cp, *p; + + if (text == NULL) + text = ""; + + /* search for '&', that is not on the of text */ + cp = strchr (text, '&'); + if (cp != NULL && cp[1] != '\0') + { + result.start = g_strndup (text, cp - text); + + /* skip '&' */ + cp++; + p = str_cget_next_char (cp); + result.hotkey = g_strndup (cp, p - cp); + + cp = p; + result.end = g_strdup (cp); + } + else + { + result.start = g_strdup (text); + result.hotkey = NULL; + result.end = NULL; + } + + return result; +} + +/* --------------------------------------------------------------------------------------------- */ + +void +hotkey_free (const hotkey_t hotkey) +{ + g_free (hotkey.start); + g_free (hotkey.hotkey); + g_free (hotkey.end); +} + +/* --------------------------------------------------------------------------------------------- */ + +int +hotkey_width (const hotkey_t hotkey) +{ + int result; + + result = str_term_width1 (hotkey.start); + result += (hotkey.hotkey != NULL) ? str_term_width1 (hotkey.hotkey) : 0; + result += (hotkey.end != NULL) ? str_term_width1 (hotkey.end) : 0; + return result; +} + +/* --------------------------------------------------------------------------------------------- */ + +gboolean +hotkey_equal (const hotkey_t hotkey1, const hotkey_t hotkey2) +{ + /* *INDENT-OFF* */ + return (strcmp (hotkey1.start, hotkey2.start) == 0) && + hotkey_cmp (hotkey1.hotkey, hotkey2.hotkey) && + hotkey_cmp (hotkey1.end, hotkey2.end); + /* *INDENT-ON* */ +} + +/* --------------------------------------------------------------------------------------------- */ + +void +hotkey_draw (Widget * w, const hotkey_t hotkey, gboolean focused) +{ + if (hotkey.start[0] != '\0') + { + widget_selectcolor (w, focused, FALSE); + tty_print_string (hotkey.start); + } + + if (hotkey.hotkey != NULL) + { + widget_selectcolor (w, focused, TRUE); + tty_print_string (hotkey.hotkey); + } + + if (hotkey.end != NULL) + { + widget_selectcolor (w, focused, FALSE); + tty_print_string (hotkey.end); + } +} + +/* --------------------------------------------------------------------------------------------- */ + +char * +hotkey_get_text (const hotkey_t hotkey) +{ + GString *text; + + text = g_string_new (hotkey.start); + + if (hotkey.hotkey != NULL) + { + g_string_append_c (text, '&'); + g_string_append (text, hotkey.hotkey); + } + + if (hotkey.end != NULL) + g_string_append (text, hotkey.end); + + return g_string_free (text, FALSE); +} + +/* --------------------------------------------------------------------------------------------- */ + +void +widget_init (Widget * w, const WRect * r, widget_cb_fn callback, widget_mouse_cb_fn mouse_callback) +{ + w->id = widget_set_id (); + w->rect = *r; + w->pos_flags = WPOS_KEEP_DEFAULT; + w->callback = callback; + + w->keymap = NULL; + w->ext_keymap = NULL; + w->ext_mode = FALSE; + + w->mouse_callback = mouse_callback != NULL ? mouse_callback : widget_default_mouse_callback; + w->owner = NULL; + w->mouse_handler = mouse_handle_event; + w->mouse.forced_capture = FALSE; + w->mouse.capture = FALSE; + w->mouse.last_msg = MSG_MOUSE_NONE; + w->mouse.last_buttons_down = 0; + + w->options = WOP_DEFAULT; + w->state = WST_CONSTRUCT | WST_VISIBLE; + + w->make_global = widget_default_make_global; + w->make_local = widget_default_make_local; + + w->make_global = widget_default_make_global; + w->make_local = widget_default_make_local; + + w->find = widget_default_find; + w->find_by_type = widget_default_find_by_type; + w->find_by_id = widget_default_find_by_id; + + w->set_state = widget_default_set_state; + w->destroy = widget_default_destroy; + w->get_colors = widget_default_get_colors; +} + +/* --------------------------------------------------------------------------------------------- */ + +/* Default callback for widgets */ +cb_ret_t +widget_default_callback (Widget * w, Widget * sender, widget_msg_t msg, int parm, void *data) +{ + (void) sender; + (void) parm; + + switch (msg) + { + case MSG_INIT: + case MSG_FOCUS: + case MSG_UNFOCUS: + case MSG_ENABLE: + case MSG_DISABLE: + case MSG_DRAW: + case MSG_DESTROY: + case MSG_CURSOR: + case MSG_IDLE: + return MSG_HANDLED; + + case MSG_RESIZE: + return widget_default_resize (w, CONST_RECT (data)); + + default: + return MSG_NOT_HANDLED; + } +} + +/* --------------------------------------------------------------------------------------------- */ + +/** + * Apply new options to widget. + * + * @param w widget + * @param options widget option flags to modify. Several flags per call can be modified. + * @param enable TRUE if specified options should be added, FALSE if options should be removed + */ +void +widget_set_options (Widget * w, widget_options_t options, gboolean enable) +{ + if (enable) + w->options |= options; + else + w->options &= ~options; +} + +/* --------------------------------------------------------------------------------------------- */ + +void +widget_adjust_position (widget_pos_flags_t pos_flags, WRect * r) +{ + if ((pos_flags & WPOS_FULLSCREEN) != 0) + { + r->y = 0; + r->x = 0; + r->lines = LINES; + r->cols = COLS; + } + else + { + if ((pos_flags & WPOS_CENTER_HORZ) != 0) + r->x = (COLS - r->cols) / 2; + + if ((pos_flags & WPOS_CENTER_VERT) != 0) + r->y = (LINES - r->lines) / 2; + + if ((pos_flags & WPOS_TRYUP) != 0) + { + if (r->y > 3) + r->y -= 2; + else if (r->y == 3) + r->y = 2; + } + } +} + +/* --------------------------------------------------------------------------------------------- */ +/** + * Change widget position and size. + * + * @param w widget + * @param y y coordinate of top-left corner + * @param x x coordinate of top-left corner + * @param lines width + * @param cols height + */ + +void +widget_set_size (Widget * w, int y, int x, int lines, int cols) +{ + WRect r = { y, x, lines, cols }; + + send_message (w, NULL, MSG_RESIZE, 0, &r); + widget_draw (w); +} + +/* --------------------------------------------------------------------------------------------- */ +/** + * Change widget position and size. + * + * @param w widget + * @param r WRect obgect that holds position and size + */ + +void +widget_set_size_rect (Widget * w, WRect * r) +{ + send_message (w, NULL, MSG_RESIZE, 0, r); + widget_draw (w); +} + +/* --------------------------------------------------------------------------------------------- */ + +void +widget_selectcolor (Widget * w, gboolean focused, gboolean hotkey) +{ + int color; + const int *colors; + + colors = widget_get_colors (w); + + if (widget_get_state (w, WST_DISABLED)) + color = DISABLED_COLOR; + else if (hotkey) + color = colors[focused ? DLG_COLOR_HOT_FOCUS : DLG_COLOR_HOT_NORMAL]; + else + color = colors[focused ? DLG_COLOR_FOCUS : DLG_COLOR_NORMAL]; + + tty_setcolor (color); +} + +/* --------------------------------------------------------------------------------------------- */ + +void +widget_erase (Widget * w) +{ + if (w != NULL) + tty_fill_region (w->rect.y, w->rect.x, w->rect.lines, w->rect.cols, ' '); +} + +/* --------------------------------------------------------------------------------------------- */ + +void +widget_set_visibility (Widget * w, gboolean make_visible) +{ + if (widget_get_state (w, WST_VISIBLE) != make_visible) + widget_set_state (w, WST_VISIBLE, make_visible); +} + +/* --------------------------------------------------------------------------------------------- */ +/** + * Check whether widget is active or not. + * Widget is active if it's current in the its owner and each owner in the chain is current too. + * + * @param w the widget + * + * @return TRUE if the widget is active, FALSE otherwise + */ + +gboolean +widget_is_active (const void *w) +{ + const WGroup *owner; + + /* Is group top? */ + if (w == top_dlg->data) + return TRUE; + + owner = CONST_WIDGET (w)->owner; + + /* Is widget in any group? */ + if (owner == NULL) + return FALSE; + + if (w != owner->current->data) + return FALSE; + + return widget_is_active (owner); +} + +/* --------------------------------------------------------------------------------------------- */ + +cb_ret_t +widget_draw (Widget * w) +{ + cb_ret_t ret = MSG_NOT_HANDLED; + + if (w != NULL && widget_get_state (w, WST_VISIBLE)) + { + WGroup *g = w->owner; + + if (g != NULL && widget_get_state (WIDGET (g), WST_ACTIVE)) + ret = w->callback (w, NULL, MSG_DRAW, 0, NULL); + } + + return ret; +} + +/* --------------------------------------------------------------------------------------------- */ +/** + * Replace widget in the dialog. + * + * @param old_w old widget that need to be replaced + * @param new_w new widget that will replace @old_w + */ + +void +widget_replace (Widget * old_w, Widget * new_w) +{ + WGroup *g = old_w->owner; + gboolean should_focus = FALSE; + GList *holder; + + if (g->widgets == NULL) + return; + + if (g->current == NULL) + g->current = g->widgets; + + /* locate widget position in the list */ + if (old_w == g->current->data) + holder = g->current; + else + holder = g_list_find (g->widgets, old_w); + + /* if old widget is focused, we should focus the new one... */ + if (widget_get_state (old_w, WST_FOCUSED)) + should_focus = TRUE; + /* ...but if new widget isn't selectable, we cannot focus it */ + if (!widget_get_options (new_w, WOP_SELECTABLE)) + should_focus = FALSE; + + /* if new widget isn't selectable, select other widget before replace */ + if (!should_focus) + { + GList *l; + + for (l = group_get_widget_next_of (holder); + !widget_is_focusable (WIDGET (l->data)) && l != holder; + l = group_get_widget_next_of (l)) + ; + + widget_select (WIDGET (l->data)); + } + + /* replace widget */ + new_w->owner = g; + new_w->id = old_w->id; + holder->data = new_w; + + send_message (old_w, NULL, MSG_DESTROY, 0, NULL); + send_message (new_w, NULL, MSG_INIT, 0, NULL); + + if (should_focus) + widget_select (new_w); + else + widget_draw (new_w); +} + +/* --------------------------------------------------------------------------------------------- */ + +gboolean +widget_is_focusable (const Widget * w) +{ + return (widget_get_options (w, WOP_SELECTABLE) && widget_get_state (w, WST_VISIBLE) && + !widget_get_state (w, WST_DISABLED)); +} + +/* --------------------------------------------------------------------------------------------- */ +/** + * Select specified widget in it's owner. + * + * Note: this function (and widget_focus(), which it calls) is a no-op + * if the widget is already selected. + * + * @param w widget to be selected + */ + +void +widget_select (Widget * w) +{ + WGroup *g; + + if (!widget_get_options (w, WOP_SELECTABLE)) + return; + + g = GROUP (w->owner); + if (g != NULL) + { + if (widget_get_options (w, WOP_TOP_SELECT)) + { + GList *l; + + l = widget_find (WIDGET (g), w); + widget_reorder (l, TRUE); + } + + widget_focus (w); + } +} + +/* --------------------------------------------------------------------------------------------- */ +/** + * Set widget at bottom of widget list. + */ + +void +widget_set_bottom (Widget * w) +{ + widget_reorder (widget_find (WIDGET (w->owner), w), FALSE); +} + +/* --------------------------------------------------------------------------------------------- */ +/** + * Look up key event of widget and translate it to command ID. + * @param w widget + * @param key key event + * + * @return command ID binded with @key. + */ + +long +widget_lookup_key (Widget * w, int key) +{ + if (w->ext_mode) + { + w->ext_mode = FALSE; + return keybind_lookup_keymap_command (w->ext_keymap, key); + } + + return keybind_lookup_keymap_command (w->keymap, key); +} + +/* --------------------------------------------------------------------------------------------- */ + +/** + * Default widget callback to convert widget coordinates from local (relative to owner) to global + * (relative to screen). + * + * @param w widget + * @delta offset for top-left corner coordinates. Used for child widgets of WGroup + */ + +void +widget_default_make_global (Widget * w, const WRect * delta) +{ + if (delta != NULL) + rect_move (&w->rect, delta->y, delta->x); + else if (w->owner != NULL) + rect_move (&w->rect, WIDGET (w->owner)->rect.y, WIDGET (w->owner)->rect.x); +} + +/* --------------------------------------------------------------------------------------------- */ + +/** + * Default widget callback to convert widget coordinates from global (relative to screen) to local + * (relative to owner). + * + * @param w widget + * @delta offset for top-left corner coordinates. Used for child widgets of WGroup + */ + +void +widget_default_make_local (Widget * w, const WRect * delta) +{ + if (delta != NULL) + rect_move (&w->rect, -delta->y, -delta->x); + else if (w->owner != NULL) + rect_move (&w->rect, -WIDGET (w->owner)->rect.y, -WIDGET (w->owner)->rect.x); +} + +/* --------------------------------------------------------------------------------------------- */ +/** + * Default callback function to find widget. + * + * @param w widget + * @param what widget to find + * + * @return holder of @what if widget is @what, NULL otherwise + */ + +GList * +widget_default_find (const Widget * w, const Widget * what) +{ + return (w != what + || w->owner == NULL) ? NULL : g_list_find (CONST_GROUP (w->owner)->widgets, what); +} + +/* --------------------------------------------------------------------------------------------- */ + +/** + * Default callback function to find widget by widget type using widget callback. + * + * @param w widget + * @param cb widget callback + * + * @return @w if widget callback is @cb, NULL otherwise + */ + +Widget * +widget_default_find_by_type (const Widget * w, widget_cb_fn cb) +{ + return (w->callback == cb ? WIDGET (w) : NULL); +} + +/* --------------------------------------------------------------------------------------------- */ +/** + * Default callback function to find widget by widget ID. + * + * @param w widget + * @param id widget ID + * + * @return @w if widget id is equal to @id, NULL otherwise + */ + +Widget * +widget_default_find_by_id (const Widget * w, unsigned long id) +{ + return (w->id == id ? WIDGET (w) : NULL); +} + +/* --------------------------------------------------------------------------------------------- */ + +/** + * Default callback function to modify state of widget. + * + * @param w widget + * @param state widget state flag to modify + * @param enable specifies whether to turn the flag on (TRUE) or off (FALSE). + * Only one flag per call can be modified. + * @return MSG_HANDLED if set was handled successfully, MSG_NOT_HANDLED otherwise. + */ + +cb_ret_t +widget_default_set_state (Widget * w, widget_state_t state, gboolean enable) +{ + gboolean ret = MSG_HANDLED; + Widget *owner = WIDGET (GROUP (w->owner)); + + if (enable) + w->state |= state; + else + w->state &= ~state; + + if (enable) + { + /* exclusive bits */ + if ((state & WST_CONSTRUCT) != 0) + w->state &= ~(WST_ACTIVE | WST_SUSPENDED | WST_CLOSED); + else if ((state & WST_ACTIVE) != 0) + w->state &= ~(WST_CONSTRUCT | WST_SUSPENDED | WST_CLOSED); + else if ((state & WST_SUSPENDED) != 0) + w->state &= ~(WST_CONSTRUCT | WST_ACTIVE | WST_CLOSED); + else if ((state & WST_CLOSED) != 0) + w->state &= ~(WST_CONSTRUCT | WST_ACTIVE | WST_SUSPENDED); + } + + if (owner == NULL) + return MSG_NOT_HANDLED; + + switch (state) + { + case WST_VISIBLE: + if (widget_get_state (owner, WST_ACTIVE)) + { + /* redraw owner to show/hide widget */ + widget_draw (owner); + + if (!enable) + { + /* try select another widget if current one got hidden */ + if (w == GROUP (owner)->current->data) + group_select_next_widget (GROUP (owner)); + + widget_update_cursor (owner); /* FIXME: unneeded? */ + } + } + break; + + + case WST_DISABLED: + ret = send_message (w, NULL, enable ? MSG_DISABLE : MSG_ENABLE, 0, NULL); + if (ret == MSG_HANDLED && widget_get_state (owner, WST_ACTIVE)) + ret = widget_draw (w); + break; + + case WST_FOCUSED: + { + widget_msg_t msg; + + msg = enable ? MSG_FOCUS : MSG_UNFOCUS; + ret = send_message (w, NULL, msg, 0, NULL); + if (ret == MSG_HANDLED && widget_get_state (owner, WST_ACTIVE)) + { + widget_draw (w); + /* Notify owner that focus was moved from one widget to another */ + send_message (owner, w, MSG_CHANGED_FOCUS, 0, NULL); + } + } + break; + + default: + break; + } + + return ret; +} + +/* --------------------------------------------------------------------------------------------- */ +/** + * Default callback function to destroy widget. + * + * @param w widget + */ + +void +widget_default_destroy (Widget * w) +{ + send_message (w, NULL, MSG_DESTROY, 0, NULL); + g_free (w); +} + +/* --------------------------------------------------------------------------------------------- */ +/* get mouse pointer location within widget */ + +Gpm_Event +mouse_get_local (const Gpm_Event * global, const Widget * w) +{ + Gpm_Event local; + + memset (&local, 0, sizeof (local)); + + local.buttons = global->buttons; + local.x = global->x - w->rect.x; + local.y = global->y - w->rect.y; + local.type = global->type; + + return local; +} + +/* --------------------------------------------------------------------------------------------- */ + +gboolean +mouse_global_in_widget (const Gpm_Event * event, const Widget * w) +{ + const WRect *r = &w->rect; + + return (event->x > r->x) && (event->y > r->y) && (event->x <= r->x + r->cols) + && (event->y <= r->y + r->lines); +} + +/* --------------------------------------------------------------------------------------------- */ |