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+
+/** \file widget-common.h
+ * \brief Header: shared stuff of widgets
+ */
+
+#ifndef MC__WIDGET_INTERNAL_H
+#define MC__WIDGET_INTERNAL_H
+
+#include "lib/keybind.h" /* global_keymap_t */
+#include "lib/tty/mouse.h"
+#include "lib/widget/mouse.h" /* mouse_msg_t, mouse_event_t */
+
+/*** typedefs(not structures) and defined constants **********************************************/
+
+#define WIDGET(x) ((Widget *)(x))
+#define CONST_WIDGET(x) ((const Widget *)(x))
+
+#define widget_gotoyx(w, _y, _x) tty_gotoyx (CONST_WIDGET(w)->rect.y + (_y), CONST_WIDGET(w)->rect.x + (_x))
+/* Sets/clear the specified flag in the options field */
+#define widget_want_cursor(w,i) widget_set_options(w, WOP_WANT_CURSOR, i)
+#define widget_want_hotkey(w,i) widget_set_options(w, WOP_WANT_HOTKEY, i)
+#define widget_want_tab(w,i) widget_set_options(w, WOP_WANT_TAB, i)
+#define widget_idle(w,i) widget_set_state(w, WST_IDLE, i)
+#define widget_disable(w,i) widget_set_state(w, WST_DISABLED, i)
+
+/*** enums ***************************************************************************************/
+
+/* Widget messages */
+typedef enum
+{
+ MSG_INIT = 0, /* Initialize widget */
+ MSG_FOCUS, /* Draw widget in focused state or widget has got focus */
+ MSG_UNFOCUS, /* Draw widget in unfocused state or widget has been unfocused */
+ MSG_CHANGED_FOCUS, /* Notification to owner about focus state change */
+ MSG_ENABLE, /* Change state to enabled */
+ MSG_DISABLE, /* Change state to disabled */
+ MSG_DRAW, /* Draw widget on screen */
+ MSG_KEY, /* Sent to widgets on key press */
+ MSG_HOTKEY, /* Sent to widget to catch preprocess key */
+ MSG_HOTKEY_HANDLED, /* A widget has got the hotkey */
+ MSG_UNHANDLED_KEY, /* Key that no widget handled */
+ MSG_POST_KEY, /* The key has been handled */
+ MSG_ACTION, /* Send to widget to handle command */
+ MSG_NOTIFY, /* Typically sent to dialog to inform it of state-change
+ * of listboxes, check- and radiobuttons. */
+ MSG_CURSOR, /* Sent to widget to position the cursor */
+ MSG_IDLE, /* The idle state is active */
+ MSG_RESIZE, /* Screen size has changed */
+ MSG_VALIDATE, /* Dialog is to be closed */
+ MSG_END, /* Shut down dialog */
+ MSG_DESTROY /* Sent to widget at destruction time */
+} widget_msg_t;
+
+/* Widgets are expected to answer to the following messages:
+ MSG_FOCUS: MSG_HANDLED if the accept the focus, MSG_NOT_HANDLED if they do not.
+ MSG_UNFOCUS: MSG_HANDLED if they accept to release the focus, MSG_NOT_HANDLED if they don't.
+ MSG_KEY: MSG_HANDLED if they actually used the key, MSG_NOT_HANDLED if not.
+ MSG_HOTKEY: MSG_HANDLED if they actually used the key, MSG_NOT_HANDLED if not.
+ */
+
+typedef enum
+{
+ MSG_NOT_HANDLED = 0,
+ MSG_HANDLED = 1
+} cb_ret_t;
+
+/* Widget options */
+typedef enum
+{
+ WOP_DEFAULT = (0 << 0),
+ WOP_WANT_HOTKEY = (1 << 0),
+ WOP_WANT_CURSOR = (1 << 1),
+ WOP_WANT_TAB = (1 << 2), /* Should the tab key be sent to the dialog? */
+ WOP_IS_INPUT = (1 << 3),
+ WOP_SELECTABLE = (1 << 4),
+ WOP_TOP_SELECT = (1 << 5)
+} widget_options_t;
+
+/* Widget state */
+typedef enum
+{
+ WST_DEFAULT = (0 << 0),
+ WST_VISIBLE = (1 << 0), /* Widget is visible */
+ WST_DISABLED = (1 << 1), /* Widget cannot be selected */
+ WST_IDLE = (1 << 2),
+ WST_MODAL = (1 << 3), /* Widget (dialog) is modal */
+ WST_FOCUSED = (1 << 4),
+
+ WST_CONSTRUCT = (1 << 15), /* Widget has been constructed but not run yet */
+ WST_ACTIVE = (1 << 16), /* Dialog is visible and active */
+ WST_SUSPENDED = (1 << 17), /* Dialog is suspended */
+ WST_CLOSED = (1 << 18) /* Dialog is closed */
+} widget_state_t;
+
+/* Flags for widget repositioning on dialog resize */
+typedef enum
+{
+ WPOS_FULLSCREEN = (1 << 0), /* widget occupies the whole screen */
+ WPOS_CENTER_HORZ = (1 << 1), /* center widget in horizontal */
+ WPOS_CENTER_VERT = (1 << 2), /* center widget in vertical */
+ WPOS_CENTER = WPOS_CENTER_HORZ | WPOS_CENTER_VERT, /* center widget */
+ WPOS_TRYUP = (1 << 3), /* try to move two lines up the widget */
+ WPOS_KEEP_LEFT = (1 << 4), /* keep widget distance to left border of dialog */
+ WPOS_KEEP_RIGHT = (1 << 5), /* keep widget distance to right border of dialog */
+ WPOS_KEEP_TOP = (1 << 6), /* keep widget distance to top border of dialog */
+ WPOS_KEEP_BOTTOM = (1 << 7), /* keep widget distance to bottom border of dialog */
+ WPOS_KEEP_HORZ = WPOS_KEEP_LEFT | WPOS_KEEP_RIGHT,
+ WPOS_KEEP_VERT = WPOS_KEEP_TOP | WPOS_KEEP_BOTTOM,
+ WPOS_KEEP_ALL = WPOS_KEEP_HORZ | WPOS_KEEP_VERT,
+ WPOS_KEEP_DEFAULT = WPOS_KEEP_LEFT | WPOS_KEEP_TOP
+} widget_pos_flags_t;
+/* NOTES:
+ * If WPOS_FULLSCREEN is set then all other position flags are ignored.
+ * If WPOS_CENTER_HORZ flag is used, other horizontal flags (WPOS_KEEP_LEFT, WPOS_KEEP_RIGHT,
+ * and WPOS_KEEP_HORZ) are ignored.
+ * If WPOS_CENTER_VERT flag is used, other horizontal flags (WPOS_KEEP_TOP, WPOS_KEEP_BOTTOM,
+ * and WPOS_KEEP_VERT) are ignored.
+ */
+
+/*** structures declarations (and typedefs of structures)*****************************************/
+
+/* Widget callback */
+typedef cb_ret_t (*widget_cb_fn) (Widget * widget, Widget * sender, widget_msg_t msg, int parm,
+ void *data);
+/* Widget mouse callback */
+typedef void (*widget_mouse_cb_fn) (Widget * w, mouse_msg_t msg, mouse_event_t * event);
+/* translate mouse event and process it */
+typedef int (*widget_mouse_handle_fn) (Widget * w, Gpm_Event * event);
+
+/* Every Widget must have this as its first element */
+struct Widget
+{
+ WRect rect; /* position and size */
+ /* ATTENTION! For groups, don't change @rect members directly to avoid
+ incorrect reposion and resize of group members. */
+ widget_pos_flags_t pos_flags; /* repositioning flags */
+ widget_options_t options;
+ widget_state_t state;
+ unsigned long id; /* uniq widget ID */
+ widget_cb_fn callback;
+ widget_mouse_cb_fn mouse_callback;
+ WGroup *owner;
+
+ /* Key-related fields */
+ const global_keymap_t *keymap; /* main keymap */
+ const global_keymap_t *ext_keymap; /* extended keymap */
+ gboolean ext_mode; /* use keymap or ext_keymap */
+
+ /* Mouse-related fields. */
+ widget_mouse_handle_fn mouse_handler;
+ struct
+ {
+ /* Public members: */
+ gboolean forced_capture; /* Overrides the 'capture' member. Set explicitly by the programmer. */
+
+ /* Implementation details: */
+ gboolean capture; /* Whether the widget "owns" the mouse. */
+ mouse_msg_t last_msg; /* The previous event type processed. */
+ int last_buttons_down;
+ } mouse;
+
+ void (*make_global) (Widget * w, const WRect * delta);
+ void (*make_local) (Widget * w, const WRect * delta);
+
+ GList *(*find) (const Widget * w, const Widget * what);
+ Widget *(*find_by_type) (const Widget * w, widget_cb_fn cb);
+ Widget *(*find_by_id) (const Widget * w, unsigned long id);
+
+ /* *INDENT-OFF* */
+ cb_ret_t (*set_state) (Widget * w, widget_state_t state, gboolean enable);
+ /* *INDENT-ON* */
+ void (*destroy) (Widget * w);
+
+ const int *(*get_colors) (const Widget * w);
+};
+
+/* structure for label (caption) with hotkey, if original text does not contain
+ * hotkey, only start is valid and is equal to original text
+ * hotkey is defined as char*, but mc support only singlebyte hotkey
+ */
+typedef struct hotkey_t
+{
+ char *start; /* never NULL */
+ char *hotkey; /* can be NULL */
+ char *end; /* can be NULL */
+} hotkey_t;
+
+/*** global variables defined in .c file *********************************************************/
+
+/*** declarations of public functions ************************************************************/
+
+/* create hotkey from text */
+hotkey_t hotkey_new (const char *text);
+/* release hotkey, free all mebers of hotkey_t */
+void hotkey_free (const hotkey_t hotkey);
+/* return width on terminal of hotkey */
+int hotkey_width (const hotkey_t hotkey);
+/* compare two hotkeys */
+gboolean hotkey_equal (const hotkey_t hotkey1, const hotkey_t hotkey2);
+/* draw hotkey of widget */
+void hotkey_draw (Widget * w, const hotkey_t hotkey, gboolean focused);
+/* get text of hotkey */
+char *hotkey_get_text (const hotkey_t hotkey);
+
+/* widget initialization */
+void widget_init (Widget * w, const WRect * r, widget_cb_fn callback,
+ widget_mouse_cb_fn mouse_callback);
+/* Default callback for widgets */
+cb_ret_t widget_default_callback (Widget * w, Widget * sender, widget_msg_t msg, int parm,
+ void *data);
+void widget_set_options (Widget * w, widget_options_t options, gboolean enable);
+void widget_adjust_position (widget_pos_flags_t pos_flags, WRect * r);
+void widget_set_size (Widget * w, int y, int x, int lines, int cols);
+void widget_set_size_rect (Widget * w, WRect * r);
+/* select color for widget in dependance of state */
+void widget_selectcolor (Widget * w, gboolean focused, gboolean hotkey);
+cb_ret_t widget_draw (Widget * w);
+void widget_erase (Widget * w);
+void widget_set_visibility (Widget * w, gboolean make_visible);
+gboolean widget_is_active (const void *w);
+void widget_replace (Widget * old, Widget * new);
+gboolean widget_is_focusable (const Widget * w);
+void widget_select (Widget * w);
+void widget_set_bottom (Widget * w);
+
+long widget_lookup_key (Widget * w, int key);
+
+void widget_default_make_global (Widget * w, const WRect * delta);
+void widget_default_make_local (Widget * w, const WRect * delta);
+
+GList *widget_default_find (const Widget * w, const Widget * what);
+Widget *widget_default_find_by_type (const Widget * w, widget_cb_fn cb);
+Widget *widget_default_find_by_id (const Widget * w, unsigned long id);
+
+cb_ret_t widget_default_set_state (Widget * w, widget_state_t state, gboolean enable);
+
+void widget_default_destroy (Widget * w);
+
+/* get mouse pointer location within widget */
+Gpm_Event mouse_get_local (const Gpm_Event * global, const Widget * w);
+gboolean mouse_global_in_widget (const Gpm_Event * event, const Widget * w);
+
+/* --------------------------------------------------------------------------------------------- */
+/*** inline functions ****************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+
+static inline cb_ret_t
+send_message (void *w, void *sender, widget_msg_t msg, int parm, void *data)
+{
+ cb_ret_t ret = MSG_NOT_HANDLED;
+
+#if 1
+ if (w != NULL) /* This must be always true, but... */
+#endif
+ ret = WIDGET (w)->callback (WIDGET (w), WIDGET (sender), msg, parm, data);
+
+ return ret;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Check whether one or several option flags are set or not.
+ * @param w widget
+ * @param options widget option flags
+ *
+ * @return TRUE if all requested option flags are set, FALSE otherwise.
+ */
+
+static inline gboolean
+widget_get_options (const Widget * w, widget_options_t options)
+{
+ return ((w->options & options) == options);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Check whether one or several state flags are set or not.
+ * @param w widget
+ * @param state widget state flags
+ *
+ * @return TRUE if all requested state flags are set, FALSE otherwise.
+ */
+
+static inline gboolean
+widget_get_state (const Widget * w, widget_state_t state)
+{
+ return ((w->state & state) == state);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Convert widget coordinates from local (relative to owner) to global (relative to screen).
+ *
+ * @param w widget
+ */
+
+static inline void
+widget_make_global (Widget * w)
+{
+ w->make_global (w, NULL);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Convert widget coordinates from global (relative to screen) to local (relative to owner).
+ *
+ * @param w widget
+ */
+
+static inline void
+widget_make_local (Widget * w)
+{
+ w->make_local (w, NULL);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Find widget.
+ *
+ * @param w widget
+ * @param what widget to find
+ *
+ * @return result of @w->find()
+ */
+
+static inline GList *
+widget_find (const Widget * w, const Widget * what)
+{
+ return w->find (w, what);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Find widget by widget type using widget callback.
+ *
+ * @param w widget
+ * @param cb widget callback
+ *
+ * @return result of @w->find_by_type()
+ */
+
+static inline Widget *
+widget_find_by_type (const Widget * w, widget_cb_fn cb)
+{
+ return w->find_by_type (w, cb);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Find widget by widget ID.
+ *
+ * @param w widget
+ * @param id widget ID
+ *
+ * @return result of @w->find_by_id()
+ */
+
+static inline Widget *
+widget_find_by_id (const Widget * w, unsigned long id)
+{
+ return w->find_by_id (w, id);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * 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.
+ */
+
+static inline cb_ret_t
+widget_set_state (Widget * w, widget_state_t state, gboolean enable)
+{
+ return w->set_state (w, state, enable);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Destroy widget.
+ *
+ * @param w widget
+ */
+
+static inline void
+widget_destroy (Widget * w)
+{
+ w->destroy (w);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Get color colors of widget.
+ *
+ * @param w widget
+ * @return color colors
+ */
+static inline const int *
+widget_get_colors (const Widget * w)
+{
+ return w->get_colors (w);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Update cursor position in the specified widget.
+ *
+ * @param w widget
+ *
+ * @return TRUE if cursor was updated successfully, FALSE otherwise
+ */
+
+static inline gboolean
+widget_update_cursor (Widget * w)
+{
+ return (send_message (w, NULL, MSG_CURSOR, 0, NULL) == MSG_HANDLED);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static inline void
+widget_show (Widget * w)
+{
+ widget_set_visibility (w, TRUE);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static inline void
+widget_hide (Widget * w)
+{
+ widget_set_visibility (w, FALSE);
+}
+
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Check whether two widgets are overlapped or not.
+ * @param a 1st widget
+ * @param b 2nd widget
+ *
+ * @return TRUE if widgets are overlapped, FALSE otherwise.
+ */
+
+static inline gboolean
+widget_overlapped (const Widget * a, const Widget * b)
+{
+ return rects_are_overlapped (&a->rect, &b->rect);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+#endif /* MC__WIDGET_INTERNAL_H */
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