+/* windows.c */
+
#include "windows.h"
-#include <stdint.h>
-#include <ncurses.h>
-#include <stdlib.h>
-#include <string.h>
-
-struct Corners {
- struct yx_uint16 tl;
- struct yx_uint16 tr;
- struct yx_uint16 bl;
- struct yx_uint16 br; };
-
-static void refit_pad (struct WinMeta *);
-static void place_win (struct WinMeta *, struct Win *);
-static void update_wins (struct WinMeta *, struct Win *);
-static void destroy_win (struct Win *);
-static void draw_wins_borders (struct Win *, struct Win *, struct Corners *, uint16_t);
-static void draw_win_borders (struct Win *, char);
-static void draw_wins (struct Win *);
-
-extern struct WinMeta init_win_meta (WINDOW * screen) {
-// Create and populate WinMeta struct with sane default values.
- struct WinMeta wmeta;
- wmeta.screen = screen;
- wmeta.pad.size.y = getmaxy(screen);
- wmeta.pad.size.x = getmaxx(screen);
- wmeta.chain_start = 0;
- wmeta.chain_end = 0;
- wmeta.pad_offset = 0;
- wmeta.pad.curses_win = newpad(wmeta.pad.size.y, 1);
- wmeta.active = 0;
- return wmeta; }
-
-extern struct Win init_win (struct WinMeta * wmeta, char * title, void * data, void * func) {
-// Create and populate Win struct with sane default values.
- struct Win w;
- w.prev = 0;
- w.next = 0;
- w.frame.curses_win = 0;
- w.title = title;
- w.frame.size.x = 20;
- w.frame.size.y = wmeta->pad.size.y - 1;
- w.data = data;
- w.draw = func;
- return w; }
-
-extern void append_win (struct WinMeta * wmeta, struct Win * w) {
-// Append win to window chain. Set active, if first window. Update geometry of windows from new window on.
- if (0 != wmeta->chain_start) {
- w->prev = wmeta->chain_end;
- wmeta->chain_end->next = w; }
- else {
- wmeta->active = w;
- wmeta->chain_start = w; }
- wmeta->chain_end = w;
- update_wins(wmeta, w); }
-
-static void refit_pad (struct WinMeta * wmeta) {
-// Fit pad width to minimum width demanded by current windows' geometries.
- uint16_t lastwincol = 0;
- struct Win * w_p = wmeta->chain_start;
- while (w_p != 0) {
- if (w_p->start.x + w_p->frame.size.x > lastwincol + 1)
- lastwincol = w_p->start.x + w_p->frame.size.x - 1;
- w_p = w_p->next; }
- if (getmaxx(wmeta->pad.curses_win) != lastwincol)
- wresize(wmeta->pad.curses_win, getmaxy(wmeta->pad.curses_win), lastwincol + 2); }
-
-extern void suspend_win (struct WinMeta * wmeta, struct Win * w) {
-// Destroy win, suspend from chain. Update geometry of following rows and pad, as well as activity selection.
- destroy_win(w);
- if (wmeta->chain_start != w) // Give win's position in the chain to element next to it in the chain.
- w->prev->next = w->next;
- else
- wmeta->chain_start = w->next;
- char pad_refitted = 0;
- if (wmeta->chain_end != w) { // Let chain element next to win know its new predecessor.
- w->next->prev = w->prev;
- if (wmeta->active == w) // If win was active, shift active window pointer to
- wmeta->active = w->next; // the next chain element, if that is a window ...
- update_wins(wmeta, w->next);
- pad_refitted = 1; }
- else {
- wmeta->chain_end = w->prev;
- if (wmeta->active == w) // ... or else to the previous element.
- wmeta->active = w->prev; }
- w->prev = 0;
- w->next = 0;
- if (0 == pad_refitted) // Refit pad if necessary.
- refit_pad(wmeta); }
-
-static void place_win (struct WinMeta * wmeta, struct Win * w) {
-// Based on position and sizes of previous window, find fitting place for current window.
- w->start.x = 0; // if window is first in chain, place it on top-left corner
- w->start.y = 1;
- if (0 != w->prev) {
- struct Win * w_top = w->prev;
- while (w_top->start.y != 1)
- w_top = w_top->prev; // else, default to placing window in new top
- w->start.x = w_top->start.x + w_top->frame.size.x + 1; // column to the right of the last one
- uint16_t w_prev_maxy = w->prev->start.y + getmaxy(w->prev->frame.curses_win);
- if (w->frame.size.x <= w->prev->frame.size.x && w->frame.size.y < wmeta->pad.size.y - w_prev_maxy) {
- w->start.x = w->prev->start.x; // place window below previous window if it fits
- w->start.y = w_prev_maxy + 1; } // vertically and is not wider than its predecessor
- else {
- struct Win * w_up = w->prev;
- struct Win * w_upup = w_up;
- uint16_t widthdiff;
- while (w_up != w_top) {
- w_upup = w_up->prev;
- while (1) {
- if (w_up->start.y != w_upup->start.y)
- break;
- w_upup = w_upup->prev; }
- w_prev_maxy = w_upup->start.y + getmaxy(w_upup->frame.curses_win);
- widthdiff = (w_upup->start.x + w_upup->frame.size.x) - (w_up->start.x + w_up->frame.size.x);
- if (w->frame.size.y < wmeta->pad.size.y - w_prev_maxy && w->frame.size.x < widthdiff) {
- w->start.x = w_up->start.x + w_up->frame.size.x + 1 ; // else try to open new sub column under
- w->start.y = w_prev_maxy + 1; // last window below which enough space remains
- break; }
- w_up = w_upup; } } } }
-
-static void update_wins (struct WinMeta * wmeta, struct Win * w) {
-// Update geometry of win and its next of kin. Destroy (if visible), (re-)build window. If need, resize pad.
- if (0 != w->frame.curses_win)
- destroy_win (w);
- place_win(wmeta, w);
- refit_pad(wmeta);
- w->frame.curses_win=subpad(wmeta->pad.curses_win, w->frame.size.y, w->frame.size.x, w->start.y, w->start.x);
- if (0 != w->next)
- update_wins (wmeta, w->next); }
-
-static void destroy_win (struct Win * w) {
-// Delete window.
- delwin(w->frame.curses_win);
- w->frame.curses_win = 0; }
-
-static void draw_win_borders (struct Win * w, char active) {
-// Draw borders of window win, including title. Decorate in a special way if window is marked as active.
- uint16_t y, x;
- for (y = w->start.y; y <= w->start.y + w->frame.size.y; y++) {
- mvwaddch(wgetparent(w->frame.curses_win), y, w->start.x - 1, '|');
- mvwaddch(wgetparent(w->frame.curses_win), y, w->start.x + w->frame.size.x, '|'); }
- for (x = w->start.x; x <= w->start.x + w->frame.size.x; x++) {
- mvwaddch(wgetparent(w->frame.curses_win), w->start.y - 1, x, '-');
- mvwaddch(wgetparent(w->frame.curses_win), w->start.y + w->frame.size.y, x, '-'); }
- char min_title_length_visible = 3; // 1 char minimal, plus 2 chars for decoration left/right of title
- if (w->frame.size.x >= min_title_length_visible) {
- uint16_t title_offset = 0;
- if (w->frame.size.x > strlen(w->title) + 2)
- title_offset = (w->frame.size.x - (strlen(w->title) + 2)) / 2; // + 2 is for decoration
- uint16_t length_visible = strnlen(w->title, w->frame.size.x - 2);
- char title[length_visible + 3];
- char decoration = ' ';
- if (1 == active)
- decoration = '$';
- memcpy(title + 1, w->title, length_visible);
- title[0] = title[length_visible + 1] = decoration;
- title[length_visible + 2] = '\0';
- mvwaddstr(wgetparent(w->frame.curses_win), w->start.y - 1, w->start.x + title_offset, title); } }
-
-static void draw_wins_borders (struct Win * w, struct Win * w_active, struct Corners * corners, uint16_t i) {
-// Call draw_win_borders() for all windows in chain from win on. Save current window's border corners.
- char active = 0;
- if (w == w_active)
- active = 1;
- draw_win_borders(w, active);
- corners[i].tl.y = w->start.y - 1;
- corners[i].tl.x = w->start.x - 1;
- corners[i].tr.y = w->start.y - 1;
- corners[i].tr.x = w->start.x + w->frame.size.x;
- corners[i].bl.y = w->start.y + w->frame.size.y;
- corners[i].bl.x = w->start.x - 1;
- corners[i].br.y = w->start.y + w->frame.size.y;
- corners[i].br.x = w->start.x + w->frame.size.x;
- if (0 != w->next) {
- draw_wins_borders (w->next, w_active, corners, i + 1); } }
-
-static void draw_wins (struct Win * w) {
-// Draw contents of all windows in window chain from win on.
- w->draw(w);
- if (0 != w->next) {
- draw_wins (w->next); } }
-
-extern void draw_scroll_hint (struct Frame * frame, uint16_t pos, uint32_t dist, char dir) {
-// Draw scroll hint into frame at pos (row or col dependend on dir), mark distance of dist cells into dir.
- char more[] = "more";
- char unit_cols[] = "columns";
- char unit_rows[] = "lines";
- uint16_t dsc_space = frame->size.x;
- char * unit = unit_rows;
- if ('<' == dir || '>' == dir) {
- dsc_space = frame->size.y;
- unit = unit_cols; }
- char * scrolldsc = malloc((4 * sizeof(char)) + strlen(more) + strlen(unit) + 10); // 10 = uint32 max strlen
- sprintf(scrolldsc, " %d %s %s ", dist, more, unit);
- char offset = 1, q;
- if (dsc_space > strlen(scrolldsc) + 1)
- offset = (dsc_space - strlen(scrolldsc)) / 2;
- chtype symbol;
- for (q = 0; q < dsc_space; q++) {
- if (q >= offset && q < strlen(scrolldsc) + offset)
- symbol = scrolldsc[q - offset] | A_REVERSE;
- else
- symbol = dir | A_REVERSE;
+#include <stdint.h> /* for uint8_t, uint16_t, uint32_t, UINT16_MAX */
+#include <ncurses.h> /* for typedefs WINDOW, chtype, wresize(), getmaxx(), */
+ /* getmaxy(), delwin(), mvwaddch(), mvwaddstr(), */
+ /* newpad(), wnoutrefres(), erase(), werase(), */
+ /* pnoutrefresh(), doupdate(), getmaxyx() */
+#include <stdlib.h> /* for malloc(), free() */
+#include <string.h> /* for strlen(), strnlen(), memcpy() */
+#include "yx_uint16.h" /* for struct yx_uint16 */
+#include "misc.h" /* for center_offset(), try_malloc() */
+#include "main.h" /* for world global */
+#include "rexit.h" /* for exit_err() */
+
+
+
+/* Fit virtual screen's width to minimum width demanded by current windows'
+ * geometries.
+ */
+static void refit_pad();
+
+/* Update geometry (sizes, positions) of window "w" and its successors in the
+ * window chain. For the positioning algorithm place_win() is used.
+ */
+static void update_wins(struct Win * w);
+static void place_win(struct Win * w);
+
+/* Draw scroll hint (a line saying that there are "dist" more elements of
+ * "unit" further into the direction symbolized by the "dir" char) into virtual
+ * screen pad, onto an appropriate edge of either a window or the screen; the
+ * left or right edge if "dir" is "<" or ">", or the upper or lower edge if it
+ * is "^" or "v". "start" should be either the start coordinate of a window's
+ * frame or .y=0, .x=wm->pad_offset if it describes the virtual screen pad.
+ * winscroll_hint() and padscroll_hint() are wrappers to simplify these uses.
+ */
+static void scroll_hint(struct yx_uint16 fsize, char dir, uint16_t dist,
+ char * unit, struct yx_uint16 start);
+static void winscroll_hint(struct Win * w, char dir, uint16_t dist);
+static void padscroll_hint(char dir, uint16_t dist);
+
+/* Draw contents of all windows in window chain from window "w" onwards. */
+static void draw_wins(struct Win * w);
+
+/* draw_win_borderlines() draws the vertical and horizontal borders of window
+ * "w" sans corners into the virtual screen "pad", and draws the top border
+ * line as the windows' title bar (highlighted if the window is described
+ * active by "active" being == 1).
+ *
+ * draw_wins_borderlines() calls draw_win_borderlines() recursively on all
+ * windows from "w" on. "w_active" is a pointer to the one window that
+ * draw_win_borderlines() is supposed to handle as the active window.
+ *
+ * Finally, draw_wins_bordercorners() draws into "pad" the borders of window "w"
+ * and all its successors.
+ */
+static void draw_win_borderlines(struct Win * w, char active, WINDOW * pad);
+static void draw_wins_borderlines(struct Win * w, struct Win * w_active,
+ WINDOW * pad);
+static void draw_wins_bordercorners(struct Win * w, WINDOW * pad);
+
+/* Shift active window forwards / backwards in window chain. */
+static void shift_win_forward();
+static void shift_win_backward();
+
+
+
+static void refit_pad()
+{
+ /* Determine rightmost window column. */
+ uint32_t lastwcol = 0;
+ struct Win * wp = world.wmeta->chain_start;
+ while (wp != 0)
+ {
+ if ((uint32_t) wp->start.x + (uint32_t) wp->framesize.x > lastwcol + 1)
+ {
+ lastwcol = (uint32_t) wp->start.x + (uint32_t) wp->framesize.x - 1;
+ }
+ wp = wp->next;
+ }
+
+ /* Only resize the pad if the rightmost window column has changed. */
+ char * err_s = "refit_pad() extends virtual screen beyond legal sizes.";
+ char * err_m = "refit_pad() triggers memory alloc error via wresize().";
+ if (getmaxx(world.wmeta->pad) + 1 != lastwcol)
+ {
+ uint8_t t = (lastwcol + 2 > UINT16_MAX);
+ exit_err(t, err_s);
+ t = wresize(world.wmeta->pad, getmaxy(world.wmeta->pad), lastwcol + 2);
+ exit_err(t, err_m);
+ }
+}
+
+
+
+static void update_wins(struct Win * w)
+{
+ place_win(w);
+ refit_pad();
+ if (0 != w->next)
+ {
+ update_wins(w->next);
+ }
+}
+
+
+
+static void place_win(struct Win * w)
+{
+ /* First window goes into the upper-left corner. */
+ w->start.x = 0;
+ w->start.y = 1; /* Leave space for title bar. */
+ if (0 != w->prev)
+ {
+
+ /* Non-first window fallbacks to: fit rightwards of rightmost border. */
+ struct Win * w_top = w->prev;
+ while (w_top->start.y != 1)
+ {
+ w_top = w_top->prev;
+ }
+ w->start.x = w_top->start.x + w_top->framesize.x + 1;
+
+ /* Fit window below its predecessor if that one directly thrones over
+ * empty space wide and high enough.
+ */
+ uint16_t w_prev_maxy = w->prev->start.y + w->prev->framesize.y;
+ if ( w->framesize.x <= w->prev->framesize.x
+ && w->framesize.y < world.wmeta->padsize.y - w_prev_maxy)
+ {
+ w->start.x = w->prev->start.x;
+ w->start.y = w_prev_maxy + 1;
+ }
+
+ /* Failing that, try to open a new sub column below the nearest
+ * predecessor window that thrones over enough empty space.
+ */
+ else
+ {
+ struct Win * w_up = w->prev;
+ struct Win * w_upup = w_up;
+ uint16_t widthdiff;
+ while (w_up != w_top)
+ {
+ w_upup = w_up->prev;
+ while (1)
+ {
+ if (w_up->start.y != w_upup->start.y)
+ {
+ break;
+ }
+ w_upup = w_upup->prev;
+ }
+ w_prev_maxy = w_upup->start.y + w_upup->framesize.y;
+ widthdiff = (w_upup->start.x + w_upup->framesize.x)
+ - (w_up->start.x + w_up->framesize.x);
+ if ( w->framesize.y < world.wmeta->padsize.y - w_prev_maxy
+ && w->framesize.x < widthdiff)
+ {
+ w->start.x = w_up->start.x + w_up->framesize.x + 1 ;
+ w->start.y = w_prev_maxy + 1;
+ break;
+ }
+ w_up = w_upup;
+ }
+ }
+ }
+}
+
+
+
+static void scroll_hint(struct yx_uint16 fsize, char dir, uint16_t dist,
+ char * unit, struct yx_uint16 start)
+{
+ /* Decide on alignment (vertical/horizontal?), thereby hint text space. */
+ char * more = "more";
+ uint16_t dsc_space = fsize.x;
if ('<' == dir || '>' == dir)
- mvwaddch(frame->curses_win, q, pos, symbol);
+ {
+ dsc_space = fsize.y;
+ } /* vv-- 10 = max strlen for uint16_t */
+ char scrolldsc[1 + strlen(more) + 1 + 10 + 1 + strlen(unit) + 1 + 1];
+ sprintf(scrolldsc, " %d %s %s ", dist, more, unit);
+
+ /* Decide on offset of the description text inside the scroll hint line. */
+ uint16_t dsc_offset = 1;
+ if (dsc_space > strlen(scrolldsc) + 1)
+ {
+ dsc_offset = (dsc_space - strlen(scrolldsc)) / 2;
+ }
+
+ /* Draw scroll hint line as dir symbols bracketing description text. */
+ uint16_t draw_offset = 0;
+ if ('>' == dir)
+ {
+ draw_offset = fsize.x - 1;
+ }
+ else if ('v' == dir)
+ {
+ draw_offset = fsize.y - 1;
+ }
+ uint16_t q = 0;
+ for (; q < dsc_space; q++)
+ {
+ chtype c = dir | A_REVERSE;
+ if (q >= dsc_offset && q < strlen(scrolldsc) + dsc_offset)
+ {
+ c = scrolldsc[q - dsc_offset] | A_REVERSE;
+ }
+ if ('<' == dir || '>' == dir)
+ {
+ mvwaddch(world.wmeta->pad, start.y + q, start.x + draw_offset, c);
+ }
+ else
+ {
+ mvwaddch(world.wmeta->pad, start.y + draw_offset, start.x + q, c);
+ }
+ }
+}
+
+
+static void padscroll_hint(char dir, uint16_t dist)
+{
+ struct yx_uint16 start;
+ start.y = 0;
+ start.x = world.wmeta->pad_offset;
+ scroll_hint(world.wmeta->padsize, dir, dist, "columns", start);
+}
+
+
+
+static void winscroll_hint(struct Win * w, char dir, uint16_t dist)
+{
+ char * unit = "lines";
+ if ('<' == dir || '>' == dir)
+ {
+ unit = "columns";
+ }
+ struct yx_uint16 start = w->start;
+ scroll_hint(w->framesize, dir, dist, unit, start);
+}
+
+
+
+static void draw_wins(struct Win * w)
+{
+ w->draw(w);
+ uint16_t y, x, size_y, size_x;
+ size_y = w->winmapsize.y;
+ size_x = w->winmapsize.x;
+ uint16_t offset_y = center_offset(w->center.y, size_y, w->framesize.y);
+ uint16_t offset_x = center_offset(w->center.x, size_x, w->framesize.x);
+ for (y = offset_y; y < w->framesize.y + offset_y && y < size_y; y++)
+ {
+ for (x = offset_x; x < w->framesize.x + offset_x && x < size_x; x++)
+ {
+ chtype ch = w->winmap[(y * w->winmapsize.x) + x];
+ mvwaddch(world.wmeta->pad, w->start.y + (y - offset_y),
+ w->start.x + (x - offset_x), ch);
+ }
+ }
+ free(w->winmap);
+ w->winmap = NULL;
+ w->winmapsize.y = 0;
+ w->winmapsize.x = 0;
+ if (offset_y > 0)
+ {
+ winscroll_hint(w, '^', offset_y + 1);
+ }
+ if (size_y > offset_y + w->framesize.y)
+ {
+ winscroll_hint(w, 'v', size_y - ((offset_y + w->framesize.y) - 1));
+ }
+ if (offset_x > 0)
+ {
+ winscroll_hint(w, '<', offset_x + 1);
+ }
+ if (size_x > offset_x + w->framesize.x)
+ {
+ winscroll_hint(w, '>', size_x - ((offset_x + w->framesize.x) - 1));
+ }
+ if (0 != w->next)
+ {
+ return draw_wins(w->next);
+ }
+}
+
+
+
+static void draw_win_borderlines(struct Win * w, char active, WINDOW * pad)
+{
+ /* Draw vertical and horizontal border lines. */
+ uint16_t y, x;
+ for (y = w->start.y; y <= w->start.y + w->framesize.y; y++)
+ {
+ mvwaddch(pad, y, w->start.x - 1, '|');
+ mvwaddch(pad, y, w->start.x + w->framesize.x, '|');
+ }
+ for (x = w->start.x; x <= w->start.x + w->framesize.x; x++)
+ {
+ mvwaddch(pad, w->start.y - 1, x, '-');
+ mvwaddch(pad, w->start.y + w->framesize.y, x, '-');
+ }
+
+ /* Draw as much as possible of the title into center of top border line. */
+ char min_title_length_visible = 3; /* min. 1 char + 2 padding/decoration */
+ if (w->framesize.x >= min_title_length_visible)
+ {
+ uint16_t title_offset = 0;
+ if (w->framesize.x > strlen(w->title) + 2)
+ {
+ title_offset = (w->framesize.x - (strlen(w->title) + 2)) / 2;
+ } /* +2 is for padding/decoration */
+ uint16_t length_visible = strnlen(w->title, w->framesize.x - 2);
+ char title[length_visible + 3];
+ char decoration = ' ';
+ if (1 == active)
+ {
+ decoration = '$';
+ }
+ memcpy(title + 1, w->title, length_visible);
+ title[0] = title[length_visible + 1] = decoration;
+ title[length_visible + 2] = '\0';
+ mvwaddstr(pad, w->start.y - 1, w->start.x + title_offset, title);
+ }
+}
+
+
+
+static void draw_wins_borderlines(struct Win * w, struct Win * w_active,
+ WINDOW * pad)
+{
+ char active = 0;
+ if (w == w_active)
+ {
+ active = 1;
+ }
+ draw_win_borderlines(w, active, pad);
+ if (0 != w->next)
+ {
+ draw_wins_borderlines(w->next, w_active, pad);
+ }
+}
+
+
+
+static void draw_wins_bordercorners(struct Win * w, WINDOW * pad)
+{
+ mvwaddch(pad, w->start.y - 1, w->start.x - 1, '+');
+ mvwaddch(pad, w->start.y - 1, w->start.x + w->framesize.x, '+');
+ mvwaddch(pad, w->start.y + w->framesize.y, w->start.x - 1, '+');
+ mvwaddch(pad, w->start.y + w->framesize.y, w->start.x + w->framesize.x,'+');
+ if (0 != w->next)
+ {
+ draw_wins_bordercorners(w->next, pad);
+ }
+}
+
+
+
+static void shift_win_forward()
+{
+ if (world.wmeta->active == world.wmeta->chain_end)
+ {
+ world.wmeta->chain_end = world.wmeta->active->prev;
+ world.wmeta->chain_end->next = 0;
+ world.wmeta->active->next = world.wmeta->chain_start;
+ world.wmeta->active->next->prev = world.wmeta->active;
+ world.wmeta->chain_start = world.wmeta->active;
+ world.wmeta->chain_start->prev = 0;
+ }
+ else
+ {
+ struct Win * old_prev = world.wmeta->active->prev;
+ struct Win * old_next = world.wmeta->active->next;
+ if (world.wmeta->chain_end == world.wmeta->active->next)
+ {
+ world.wmeta->chain_end = world.wmeta->active;
+ world.wmeta->active->next = 0;
+ }
+ else
+ {
+ world.wmeta->active->next = old_next->next;
+ world.wmeta->active->next->prev = world.wmeta->active;
+ }
+ if (world.wmeta->chain_start == world.wmeta->active)
+ {
+ world.wmeta->chain_start = old_next;
+ }
+ else
+ {
+ old_prev->next = old_next;
+ }
+ old_next->prev = old_prev;
+ old_next->next = world.wmeta->active;
+ world.wmeta->active->prev = old_next;
+ }
+}
+
+
+
+static void shift_win_backward()
+{
+ if (world.wmeta->active == world.wmeta->chain_start)
+ {
+ world.wmeta->chain_start = world.wmeta->active->next;
+ world.wmeta->chain_start->prev = 0;
+ world.wmeta->active->prev = world.wmeta->chain_end;
+ world.wmeta->active->prev->next = world.wmeta->active;
+ world.wmeta->chain_end = world.wmeta->active;
+ world.wmeta->chain_end->next = 0;
+ }
+ else
+ {
+ struct Win * old_prev = world.wmeta->active->prev;
+ struct Win * old_next = world.wmeta->active->next;
+ if (world.wmeta->chain_start == world.wmeta->active->prev)
+ {
+ world.wmeta->chain_start = world.wmeta->active;
+ world.wmeta->active->prev = 0;
+ }
+ else
+ {
+ world.wmeta->active->prev = old_prev->prev;
+ world.wmeta->active->prev->next = world.wmeta->active;
+ }
+ if (world.wmeta->chain_end == world.wmeta->active)
+ {
+ world.wmeta->chain_end = old_prev;
+ }
+ else
+ {
+ old_next->prev = old_prev;
+ }
+ old_prev->next = old_next;
+ old_prev->prev = world.wmeta->active;
+ world.wmeta->active->next = old_prev;
+ }
+}
+
+
+
+extern void init_win_meta(WINDOW * screen)
+{
+ char * f_name = "init_win_meta()";
+ char * err_s = "init_win_meta() creates virtual screen beyond legal size.";
+ char * err_m = "init_win_meta() triggers memory alloc error via newpad().";
+ world.wmeta = try_malloc(sizeof(struct WinMeta), f_name);
+ world.wmeta->screen = screen;
+ uint32_t maxy_test = getmaxy(screen);
+ uint32_t maxx_test = getmaxx(screen);
+ uint8_t test = (maxy_test > UINT16_MAX || maxx_test > UINT16_MAX);
+ exit_err(test, err_s);
+ world.wmeta->padsize.y = maxy_test;
+ world.wmeta->padsize.x = maxx_test;
+ world.wmeta->chain_start = 0;
+ world.wmeta->chain_end = 0;
+ world.wmeta->pad_offset = 0;
+ world.wmeta->pad = newpad(world.wmeta->padsize.y, 1);
+ exit_err(NULL == world.wmeta->pad, err_m);
+ world.wmeta->active = 0;
+}
+
+
+
+extern void init_win(struct Win ** wp, char * title, int16_t height,
+ int16_t width, void * func)
+{
+ char * f_name = "init_win()";
+ struct Win * w = try_malloc(sizeof(struct Win), f_name);
+ w->prev = 0;
+ w->next = 0;
+ w->winmapsize.y = 0;
+ w->winmapsize.x = 0;
+ w->winmap = NULL;
+ w->title = try_malloc(strlen(title) + 1, f_name);
+ sprintf(w->title, "%s", title);
+ w->draw = func;
+ w->center.y = 0;
+ w->center.x = 0;
+ if (0 < width)
+ {
+ w->framesize.x = width;
+ }
+ else if (0 >= width)
+ {
+ w->framesize.x = world.wmeta->padsize.x + width;
+ }
+ if (0 < height && height <= world.wmeta->padsize.y - 1)
+ {
+ w->framesize.y = height;
+ }
+ else if (0 >= height && world.wmeta->padsize.y + (height - 1) > 0)
+ {
+ w->framesize.y = world.wmeta->padsize.y + (height - 1);
+ }
+ *wp = w;
+}
+
+
+
+extern void free_winmeta()
+{
+ delwin(world.wmeta->pad);
+ free(world.wmeta);
+}
+
+
+
+extern void free_win(struct Win * win)
+{
+ free(win->title);
+ free(win);
+}
+
+
+
+extern void append_win(struct Win * w)
+{
+ if (0 != world.wmeta->chain_start)
+ {
+ w->prev = world.wmeta->chain_end;
+ world.wmeta->chain_end->next = w;
+ }
else
- mvwaddch(frame->curses_win, pos, q, symbol); }
- free(scrolldsc); }
-
-extern void draw_all_wins (struct WinMeta * wmeta) {
-// Draw pad with all windows and their borders, plus scrolling hints.
- erase();
- wnoutrefresh(wmeta->screen);
- werase(wmeta->pad.curses_win);
- if (wmeta->chain_start) {
- uint16_t n_wins = 1, i;
- struct Win * win_p = wmeta->chain_start;
- while (0 != win_p->next) {
- win_p = win_p->next;
- n_wins++; }
- struct Corners * all_corners = malloc(sizeof(struct Corners) * n_wins);
- draw_wins (wmeta->chain_start);
- draw_wins_borders (wmeta->chain_start, wmeta->active, all_corners, 0);
- for (i = 0; i < n_wins; i++) {
- mvwaddch(wmeta->pad.curses_win, all_corners[i].tl.y, all_corners[i].tl.x, '+');
- mvwaddch(wmeta->pad.curses_win, all_corners[i].tr.y, all_corners[i].tr.x, '+');
- mvwaddch(wmeta->pad.curses_win, all_corners[i].bl.y, all_corners[i].bl.x, '+');
- mvwaddch(wmeta->pad.curses_win, all_corners[i].br.y, all_corners[i].br.x, '+'); }
- free(all_corners);
- if (wmeta->pad_offset > 0)
- draw_scroll_hint(&wmeta->pad, wmeta->pad_offset, wmeta->pad_offset + 1, '<');
- if (wmeta->pad_offset + wmeta->pad.size.x < getmaxx(wmeta->pad.curses_win) - 1)
- draw_scroll_hint(&wmeta->pad, wmeta->pad_offset + wmeta->pad.size.x - 1,
- getmaxx(wmeta->pad.curses_win) - (wmeta->pad_offset + wmeta->pad.size.x), '>');
- pnoutrefresh(wmeta->pad.curses_win, 0, wmeta->pad_offset, 0, 0, wmeta->pad.size.y, wmeta->pad.size.x-1); }
- doupdate(); }
-
-extern void resize_active_win (struct WinMeta * wmeta, uint16_t height, uint16_t width) {
-// Grow or shrink currently active window. Correct its geometry and that of its followers.
- if (0 != wmeta->active && width > 0 && height > 0 && height < wmeta->pad.size.y) {
- wmeta->active->frame.size.y = height;
- wmeta->active->frame.size.x = width;
- update_wins(wmeta, wmeta->chain_start); } }
-
-extern void cycle_active_win (struct WinMeta * wmeta, char dir) {
-// Cycle active window selection forwards (dir = 'n') or backwards.
- if (0 != wmeta->active) {
- if ('n' == dir) {
- if (wmeta->active->next != 0)
- wmeta->active = wmeta->active->next;
- else
- wmeta->active = wmeta->chain_start; }
- else {
- if (wmeta->active->prev != 0)
- wmeta->active = wmeta->active->prev;
- else
- wmeta->active = wmeta->chain_end; } } }
-
-extern void shift_active_win (struct WinMeta * wmeta, char dir) {
-// Move active window forward/backward in window chain. If jumping beyond start/end, move to other chain end.
- if (0 != wmeta->active && wmeta->chain_start != wmeta->chain_end && (dir == 'f' || dir == 'b')) {
- struct Win * w_shift = wmeta->active, * w_p, * w_p_next;
- char wrap = 0;
- if ((dir == 'f' && w_shift == wmeta->chain_end) || (dir == 'b' && w_shift == wmeta->chain_start))
- wrap = 1;
- uint16_t i, i_max;
- for (i_max = 1, w_p = wmeta->chain_start; w_p != wmeta->chain_end; i_max++)
- w_p = w_p->next;
- struct Win ** wins = malloc(i_max * sizeof(struct Win *));
- for (i = 0, w_p = wmeta->chain_start; i < i_max; i++) {
- w_p_next = w_p->next;
- suspend_win(wmeta, w_p);
- wins[i] = w_p;
- w_p = w_p_next; }
- if (wrap)
- if (dir == 'f') {
- append_win(wmeta, w_shift);
- for (i = 0; i < i_max - 1; i++)
- append_win(wmeta, wins[i]); }
- else {
- for (i = 1; i < i_max; i++)
- append_win(wmeta, wins[i]);
- append_win(wmeta, w_shift); }
+ {
+ world.wmeta->active = w;
+ world.wmeta->chain_start = w;
+ }
+ world.wmeta->chain_end = w;
+ update_wins(w);
+}
+
+
+
+extern void suspend_win(struct Win * w)
+{
+ if (world.wmeta->chain_start != w)
+ {
+ w->prev->next = w->next;
+ }
else
- for (i = 0; i < i_max; i++)
- if ((dir == 'f' && w_shift == wins[i]) || (dir == 'b' && w_shift == wins[i+1])) {
- append_win(wmeta, wins[i+1]);
- append_win(wmeta, wins[i]);
- i++; }
+ {
+ world.wmeta->chain_start = w->next;
+ }
+ char pad_refitted = 0;
+ if (world.wmeta->chain_end != w)
+ {
+ w->next->prev = w->prev;
+ if (world.wmeta->active == w)
+ {
+ world.wmeta->active = w->next;
+ }
+ update_wins(w->next); /* Positioning of successor windows may be */
+ pad_refitted = 1; /* affected / need correction. Note that */
+ } /* update_wins() already refits the pad, */
+ else /* voiding later need for that. */
+ {
+ world.wmeta->chain_end = w->prev;
+ if (world.wmeta->active == w)
+ {
+ world.wmeta->active = w->prev;
+ }
+ }
+
+ w->prev = 0;
+ w->next = 0;
+
+ if (0 == pad_refitted)
+ {
+ refit_pad();
+ }
+}
+
+
+
+extern void reset_pad_offset(uint16_t new_offset)
+{
+ if (new_offset >= 0
+ && (new_offset < world.wmeta->pad_offset
+ || new_offset + world.wmeta->padsize.x < getmaxx(world.wmeta->pad)))
+ {
+ world.wmeta->pad_offset = new_offset;
+ }
+}
+
+
+
+extern void resize_active_win(struct yx_uint16 size)
+{
+ if (0 != world.wmeta->active
+ && size.x > 0 && size.y > 0 && size.y < world.wmeta->padsize.y)
+ {
+ world.wmeta->active->framesize = size;
+ update_wins(world.wmeta->active); /* Positioning of following */
+ } /* windows may be affected. */
+}
+
+
+
+extern void cycle_active_win(char dir)
+{
+ if (0 != world.wmeta->active)
+ {
+ if ('f' == dir)
+ {
+ if (world.wmeta->active->next != 0)
+ {
+ world.wmeta->active = world.wmeta->active->next;
+ }
+ else
+ {
+ world.wmeta->active = world.wmeta->chain_start;
+ }
+ }
else
- append_win(wmeta, wins[i]);
- free(wins);
- wmeta->active = w_shift; } }
-
-extern void reset_pad_offset(struct WinMeta * wmeta, uint16_t new_offset) {
-// Apply new_offset to windows pad, if it proves to be sane.
- if (new_offset >= 0 && new_offset + wmeta->pad.size.x < getmaxx(wmeta->pad.curses_win))
- wmeta->pad_offset = new_offset; }
+ {
+ if (world.wmeta->active->prev != 0)
+ {
+ world.wmeta->active = world.wmeta->active->prev;
+ }
+ else
+ {
+ world.wmeta->active = world.wmeta->chain_end;
+ }
+ }
+ }
+}
+
+
+
+extern void shift_active_win(char dir)
+{
+ if ( 0 == world.wmeta->active /* No shifting with < 2 windows visible. */
+ || world.wmeta->chain_start == world.wmeta->chain_end)
+ {
+ return;
+ }
+ if ('f' == dir)
+ {
+ shift_win_forward();
+ }
+ else
+ {
+ shift_win_backward();
+ }
+ update_wins(world.wmeta->chain_start);
+}
+
+
+
+extern void draw_all_wins()
+{
+ /* Empty everything before filling it a-new. */
+ erase();
+ wnoutrefresh(world.wmeta->screen);
+ werase(world.wmeta->pad);
+ if (world.wmeta->chain_start)
+ {
+
+ /* Draw windows' borders first, then windows. */
+ draw_wins_borderlines(world.wmeta->chain_start, world.wmeta->active,
+ world.wmeta->pad);
+ draw_wins_bordercorners(world.wmeta->chain_start, world.wmeta->pad);
+ draw_wins(world.wmeta->chain_start);
+
+ /* Draw virtual screen scroll hints. */
+ if (world.wmeta->pad_offset > 0)
+ {
+ padscroll_hint('<', world.wmeta->pad_offset + 1);
+ }
+ uint16_t size_x = getmaxx(world.wmeta->pad);
+ uint16_t right_edge = world.wmeta->pad_offset + world.wmeta->padsize.x;
+ if (right_edge < size_x - 1)
+ {
+ padscroll_hint('>', size_x - right_edge);
+ }
+
+ /* Write pad segment to be shown on physical screen to screen buffer. */
+ pnoutrefresh(world.wmeta->pad, 0, world.wmeta->pad_offset, 0, 0,
+ world.wmeta->padsize.y, world.wmeta->padsize.x - 1);
+ }
+
+ /* Only at the end write accumulated changes to the physical screen. */
+ doupdate();
+}