* (in a bizarre fashion, see below) 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.
+ * 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.
*
* Positioning of windows can only indirectly be influenced: by resizing them,
* and by shifting their relative position inside the (currently invisible)
* that thrones over enough space to fit them in; failing that, they are placed
* to the right of the window with the rightmost border.
*
+ * Functions that return uint8_t return these error codes:
+ * 0 - success
+ * 1 - memory allocation error (of ncurses' pads/windows, or scroll hint texts)
+ * 2 - activity forces virtual screen to grow beyond width of 2^16 cells
+ *
* 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.
*/
#ifndef WINDOWS_H
-#include <stdint.h> /* for uint16_t, uint32_t */
+#include <stdint.h> /* for uint8_t, uint16_t, uint32_t */
#include <ncurses.h> /* for the WINDOW typedef */
#include "yx_uint16.h" /* for yx_uint16 coordinates */
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 Win * _prev; /* INTERNAL */ /* _prev == _next == 0 if */
+ struct Win * _next; /* INTERNAL */ /* Win is outside the chain */
+ struct yx_uint16 _start; /* INTERNAL: upper left corner of WINDOW */
+ char * _title; /* INTERNAL: title for window title bar */
+ void (* _draw) (struct Win *); /* INTERNAL: how to draw window content */
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 */
+ void * data; /* window content to be drawn by _draw() */
};
*/
struct WinMeta
{
- WINDOW * screen; /* terminal 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 */
+ WINDOW * _screen; /* INTERNAL: terminal screen */
+ struct Win * _chain_start; /* INTERNAL: first Win, ._prev to point to 0 */
+ struct Win * _chain_end; /* INTERNAL: last Win, ._next to point to 0 */
+ uint16_t pad_offset; /* number of cells view is moved to the right */
+ struct Frame padframe; /* virtual screen fitted into terminal screen */
+ struct Win * active; /* Win highlighted/selected for manipulation */
};
* 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.
*/
extern uint8_t init_win_meta(WINDOW * screen, struct WinMeta * wmeta);
* invisible until appended to the chain of visible windows via append_win().
*/
extern struct Win init_win(struct WinMeta * wmeta, char * title,
- uint16_t height, uint16_t widtht,
+ uint16_t height, uint16_t width,
void * data, void * func);
* 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.
*/
extern uint8_t append_win(struct WinMeta * wmeta, struct Win * w);
extern uint8_t suspend_win(struct WinMeta * wmeta, struct Win * w);
/* 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.
*/
extern uint8_t resize_active_win(struct WinMeta * wmeta, struct yx_uint16 size);
/* 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.
- *
- * Return 0 on success, and 1 on (ncurses window/pad memory allocation) error.
*/
extern uint8_t shift_active_win(struct WinMeta * wmeta, char dir);
-/* Draw virtual screen including all windows. Also add scroll hints (a line
- * stating that there is more to see on scrolling further into a certain
- * direction) for where the edges of the terminal screen hit non-edges of and
- * inside the virtual screen. Then update the terminal screen.
+/* 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.
*/
-extern void draw_all_wins(struct WinMeta * wmeta);
+extern uint8_t draw_all_wins(struct WinMeta * wmeta);
* 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).
*/
extern uint8_t draw_scroll_hint(struct Frame * frame, uint16_t pos,
uint32_t dist, char dir);
projects / plomrogue / blobdiff