*
* A tiled window manager for the terminal.
*
- * It provides a virtual screen that can be scrolled horizontally and may
- * contain any number of windows that can be appeared, disappeared, resized and
- * (somewhat) moved around. They have borders and a title bar and are positioned
- * (in a bizarre fashion, see below) automatically.
+ * It provides a virtual screen that can be scrolled horizontally and may carry
+ * any number of windows to be appeared, disappeared, resized and moved around.
+ * They have borders and a title bar and are positioned automatically.
*
- * Windows can be almost any width (number has to fit into 16 bits); the virtual
- * screen grows with them as needed -- but only horizontally. Their height is
- * limited by the height of the terminal screen.
+ * Windows can be any width between 1 and 2^16 cells. The virtual screen grows
+ * with them as needed -- but only horizontally and only up to 2^16 cells. Their
+ * height is limited by the height of the terminal screen (maximum 2^16 cells).
*
- * Positioning of windows can only indirectly be influenced: by resizing them,
- * and by shifting their relative position inside the (currently invisible)
- * chain that the window manager treats their plurality as. The first window
- * goes into the upper left corner of the virtual screen. Further visible
- * windows are fitted left-aligned below their (chain-wise) closest predecessor
- * that thrones over enough space to fit them in; failing that, they are placed
- * to the right of the window with the rightmost border.
+ * Windows' positioning can be influenced only indirectly: by resizing them, and
+ * by shifting their relative position inside the (currently invisible) chain
+ * that the window manager treats their plurality as. The first window goes into
+ * the top left corner of the virtual screen. Further windows are fitted as
+ * left-aligned as possible below their (chain-wise) closest predecessor that
+ * thrones over enough space to contain them and that is open to the right. If
+ * that fails, they're fitted up-right to the window with the rightmost border.
*
- * TODO: Think up a more intuitive window positioning algorithm or at least make
- * the chain that windows are positioned by visible.
- *
- * TODO: Ensure there are only windows as many / as big as fit into the maximum
- * size of the virtual screen.
+ * TODO: Think up a more intuitive window positioning algorithm.
*/
#ifndef WINDOWS_H
#define WINDOWS_H
+#include <stdint.h> /* for uint8_t, uint16_t, uint32_t */
+#include <ncurses.h> /* for the WINDOW and chtype typedefs */
+#include "yx_uint16.h" /* for yx_uint16 struct */
-#include <stdint.h> /* for uint16_t, uint32_t */
-#include <ncurses.h> /* for the WINDOW typedef */
-#include "yx_uint16.h" /* for yx_uint16 coordinates */
-
-/* Individual windows consist of potential (real if window is visible) ncurses
- * WINDOWs wrapped inside Frame structs (that keep a window's designated size
- * even when it is invisible) wrapped inside metadata-rich Win structs. Win
- * structs are chained into a linked list of all the windows visible on the
- * virtual screen and also contain pointers to what content is to be drawn
- * inside the window, and by use of what method.
+/* "Win" structs describe windows as frames located inside the virtual screen
+ * pad through which "winmaps" are visible, 2-dimensional maps of ncurses
+ * chtypes. If a winmap is bigger than its frame, scrolling hints will appear at
+ * the proper edges. Win structs are chained into a linked list of all the
+ * windows visible on the virtual screen and also contain pointers to what
+ * content is to be drawn inside the window, and by use of what method.
*/
-
-struct Frame
-{
- WINDOW * curses_win;
- struct yx_uint16 size; /* the size curses_win fits into; for the virtual */
-}; /* screen padframe: the terminal screen size */
-
struct Win
{
- struct Win * prev; /* prev=next=0 if Win is outside the chain */
- struct Win * next;
- struct yx_uint16 start; /* upper left corner (of WINDOW or border?) */
- struct Frame frame;
- char * title; /* title to be shown on window border top */
- void (* draw) (struct Win *); /* function to draw window content ("data") */
- void * data; /* content to be drawn; draw() knows how */
+ struct Win * prev; /* chain pointers; if 0, they mark the start or end */
+ struct Win * next; /* of the chain; if both are 0, Win is outside chain */
+ struct yx_uint16 framesize; /* window frame size to see winmap through */
+ struct yx_uint16 start; /* upper left corner of window in pad */
+ struct yx_uint16 center; /* winmap cell to center frame on if smaller*/
+ char * title; /* title to be used in window title bar */
+ void (* draw) (struct Win *); /* function that draws/updates the winmap */
+ chtype * winmap; /* sequence of cells, sorted into lines ... */
+ struct yx_uint16 winmapsize; /* ... with these geometry infos */
};
-
-
-/* The window manager's parent struct WinMeta provides the virtual screen and a
- * representation of the terminal screen. It also anchors start and end of the
- * windows chain.
+/* The window manager's parent struct WinMeta contains the virtual screen,
+ * relates it to the terminal screen and anchors the chain of visible windows.
*/
struct WinMeta
{
- WINDOW * screen; /* terminal screen */
+ WINDOW * screen; /* ncurses' pointer to the terminal screen */
+ WINDOW * pad; /* ncurses pad of virtual screen */
uint16_t pad_offset; /* number of cells view is moved to the right */
- struct Frame padframe; /* virtual screen fitted into terminal screen */
- struct Win * chain_start; /* first Win, whose .prev shall point to 0 */
- struct Win * chain_end; /* last Win, whose .next shall point to 0 */
- struct Win * active; /* window highlighted/selected for manipulation */
+ struct yx_uint16 padsize; /* virtual screen size */
+ struct Win * chain_start; /* first Win in chain; its _prev == 0 */
+ struct Win * chain_end; /* last Win in chain; its _next == 0 */
+ struct Win * active; /* Win highlighted/selected for manipulation */
};
-/* Initialize empty WinMeta "wmeta" on the terminal "screen". Note that
- * emptiness is marked by WinMeta.chain_start=0. Other struct values are also
- * initialized 0, except for the virtual screen (terminal screen height, width =
- * 1) and its terminal-sized frame.
- *
- * Returns 0 on success, 1 on (ncurses newpad() memory allocation) error.
+/* Initialize empty "wmeta" on terminal screen. All struct members initialize to
+ * 0, except for .screen, the newly created virtual screen .pad and its .padsize
+ * (height: that of the terminal screen; width: 1 cell).
*/
-extern uint8_t init_win_meta(WINDOW * screen, struct WinMeta * wmeta);
+extern void init_win_meta();
-
-
-/* Create a window below inside "wmeta" titled "title" of "height" and "width"
- * and appointing "func"() to interpret and draw the content stored at "data"
- * if the window is visible.
+/* Initialize a Win child "wp" of "wmeta" to "title", "height" and "width" and
+ * appoint "func"() as its .draw. Initialize other members to 0.
*
- * A value for "width" <1 will trigger a fallback to width=1. A "height" <1 or
- * larger than the maximum window height possible within the virtual screen will
- * trigger a fallback to the maximum height possible (i.e. pass a "height" of 0
- * to initialize the window to its largest possible height).
- *
- * Other values of the Win struct will be initialized to 0. The window will stay
- * invisible until appended to the chain of visible windows via append_win().
+ * Pass 0 for "width" to make the window as wide as the terminal screen. Pass 0
+ * for "height" for the maximum allowed height: one cell smaller than that of
+ * the terminal screen. Pass negative values for either of them to make the
+ * window width/height so many cells smaller than what 0 would set. The maximum
+ * allowed height is also applied for positive height values that exceed it or
+ * negative values that would reduce the window height to less than 1 cell.
*/
-extern struct Win init_win(struct WinMeta * wmeta, char * title,
- uint16_t height, uint16_t widtht,
- void * data, void * func);
-
+extern void init_win(struct Win ** wp, char * title, int16_t height,
+ int16_t width, void * func);
+/* Free memory initialized Win/WinMeta structs; endwin() for the latter, too. */
+extern void free_winmeta_and_endwin();
+extern void free_win(struct Win * win);
-/* Append/suspend window "w" to/from chain of visible windows in "wmeta".
+/* Append/suspend window "w" to/from chain of visible windows below "wmeta".
* Appended windows will become active. Suspended active windows will move the
* active window selection to their successor in the window chain or, failing
- * that, their predecessor; if no window remains, none will be active.
- *
- * Return 0 on success, and 1 on (ncurses window/pad memory allocation) error.
+ * that, their predecessor, or, failing that, to 0 (no window active).
*/
-extern uint8_t append_win(struct WinMeta * wmeta, struct Win * w);
-extern uint8_t suspend_win(struct WinMeta * wmeta, struct Win * w);
-
+extern void append_win(struct Win * w);
+extern void suspend_win(struct Win * w);
-
-/* Apply scrolling offset "new_offset" to virtual screen if it is sane, i.e.
- * it's equal/greater zero and does not push the view (further) beyond the
- * virtual screen's border. If the view is already beyond the virtual screen's
- * border due to it having shrunk after suspension of windows, only allow view
- * movement leftwards.
+/* Apply scrolling offset "new_offset" to virtual screen if it is equal/greater
+ * 0 and does not push the view (further) beyond the virtual screen's border. If
+ * the view is already beyond the virtual screen's border due to it having
+ * shrunk after suspension of windows, only allow screen scrolling leftwards.
*/
-extern void reset_pad_offset(struct WinMeta * wmeta, uint16_t new_offset);
-
+extern void reset_pad_offset(uint16_t new_offset);
-
-/* Apply new size "size" to the active window, but only if it provides for at
- * least one cell width/height and is in height at least one cell smaller than
- * the screen's vertical height (to provide space for the title bar).
- *
- * Returns 0 on success, 1 on (ncurses window/pad memory allocation) error.
+/* Apply "size" to the active window if it provides a minimum size of 1x1 cells
+ * and is in height at least one cell smaller than the screen's vertical height
+ * (to provide space for the title bar). Does nothing if no window is active.
*/
-extern uint8_t resize_active_win(struct WinMeta * wmeta, struct yx_uint16 size);
-
-
+extern void resize_active_win(struct yx_uint16 size);
-/* Cycle active window selection forwards (set dir="n") or backwards. Wrap
- * around in the windows chain if start / end of it is met.
+/* Cycle active window selection forwards ("dir" == "f") or backwards (any
+ * other "dir"). Wrap around in the windows chain if start / end of it is met.
+ * Does nothing if no window is active.
*/
-extern void cycle_active_win(struct WinMeta * wmeta, char dir);
+extern void cycle_active_win(char dir);
-
-
-/* Move active window forwards (set dir="f") or backwards (set dir="b"). Wrap
- * around in the window chain if start / end of it is met.
- *
- * Returns 0 on success, 1 on (ncurses window/pad memory allocation) error.
+/* Move active window forwards ("dir" == "f") or backwards (any other "dir") in
+ * the window chain. Wrap around in the window chain if start / end of it is
+ * met. Does nothing if no window is active.
*/
-extern uint8_t shift_active_win(struct WinMeta * wmeta, char dir);
-
+extern void shift_active_win(char dir);
-
-/* Draw virtual screen including all windows. Also add scroll hints (see comment
- * on draw_scroll_hint()) for where the edges of the terminal screen hit
- * non-edges of and inside the virtual screen. Then update the terminal screen.
- *
- * Returns 0 on success, 1 on error (of scroll hint text memory allocation).
- */
-extern uint8_t draw_all_wins(struct WinMeta * wmeta);
-
-
-
-/* Draw scroll hint (a line stating that there is more to see on scrolling
- * further into a certain direction) into "frame" at position "pos" (describing
- * a column or a row dependent on "dir" being *either* "<"/">" *or* something
- * else). It will consist of a line of "dir" symbols bracketing a descriptive
- * text stating the number of rows/columns further available beyond the hint.
- *
- * Return 0 on success, and 1 on error (of scroll hint text memory allocation).
+/* Draw virtual screen and its windows. Add scroll hints where edges of terminal
+ * screen hit non-edges inside the virtual screen. Then update terminal screen.
*/
-extern uint8_t draw_scroll_hint(struct Frame * frame, uint16_t pos,
- uint32_t dist, char dir);
+extern void draw_all_wins();
projects / plomrogue / blobdiff