/* $OpenBSD: layout.c,v 1.21 2014/02/22 18:01:10 nicm Exp $ */ /* * Copyright (c) 2009 Nicholas Marriott * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include #include "tmux.h" /* * The window layout is a tree of cells each of which can be one of: a * left-right container for a list of cells, a top-bottom container for a list * of cells, or a container for a window pane. * * Each window has a pointer to the root of its layout tree (containing its * panes), every pane has a pointer back to the cell containing it, and each * cell a pointer to its parent cell. */ int layout_resize_pane_grow(struct layout_cell *, enum layout_type, int); int layout_resize_pane_shrink(struct layout_cell *, enum layout_type, int); struct layout_cell * layout_create_cell(struct layout_cell *lcparent) { struct layout_cell *lc; lc = xmalloc(sizeof *lc); lc->type = LAYOUT_WINDOWPANE; lc->parent = lcparent; TAILQ_INIT(&lc->cells); lc->sx = UINT_MAX; lc->sy = UINT_MAX; lc->xoff = UINT_MAX; lc->yoff = UINT_MAX; lc->wp = NULL; lc->lastwp = NULL; return (lc); } void layout_free_cell(struct layout_cell *lc) { struct layout_cell *lcchild; switch (lc->type) { case LAYOUT_LEFTRIGHT: case LAYOUT_TOPBOTTOM: while (!TAILQ_EMPTY(&lc->cells)) { lcchild = TAILQ_FIRST(&lc->cells); TAILQ_REMOVE(&lc->cells, lcchild, entry); layout_free_cell(lcchild); } break; case LAYOUT_WINDOWPANE: if (lc->wp != NULL) lc->wp->layout_cell = NULL; break; } free(lc); } void layout_print_cell(struct layout_cell *lc, const char *hdr, u_int n) { struct layout_cell *lcchild; log_debug( "%s:%*s%p type %u [parent %p] wp=%p [%u,%u %ux%u]", hdr, n, " ", lc, lc->type, lc->parent, lc->wp, lc->xoff, lc->yoff, lc->sx, lc->sy); switch (lc->type) { case LAYOUT_LEFTRIGHT: case LAYOUT_TOPBOTTOM: TAILQ_FOREACH(lcchild, &lc->cells, entry) layout_print_cell(lcchild, hdr, n + 1); break; case LAYOUT_WINDOWPANE: break; } } void layout_set_size( struct layout_cell *lc, u_int sx, u_int sy, u_int xoff, u_int yoff) { lc->sx = sx; lc->sy = sy; lc->xoff = xoff; lc->yoff = yoff; } void layout_make_leaf(struct layout_cell *lc, struct window_pane *wp) { lc->type = LAYOUT_WINDOWPANE; TAILQ_INIT(&lc->cells); wp->layout_cell = lc; lc->wp = wp; } void layout_make_node(struct layout_cell *lc, enum layout_type type) { if (type == LAYOUT_WINDOWPANE) fatalx("bad layout type"); lc->type = type; TAILQ_INIT(&lc->cells); if (lc->wp != NULL) lc->wp->layout_cell = NULL; lc->wp = NULL; } /* Fix cell offsets based on their sizes. */ void layout_fix_offsets(struct layout_cell *lc) { struct layout_cell *lcchild; u_int xoff, yoff; if (lc->type == LAYOUT_LEFTRIGHT) { xoff = lc->xoff; TAILQ_FOREACH(lcchild, &lc->cells, entry) { lcchild->xoff = xoff; lcchild->yoff = lc->yoff; if (lcchild->type != LAYOUT_WINDOWPANE) layout_fix_offsets(lcchild); xoff += lcchild->sx + 1; } } else { yoff = lc->yoff; TAILQ_FOREACH(lcchild, &lc->cells, entry) { lcchild->xoff = lc->xoff; lcchild->yoff = yoff; if (lcchild->type != LAYOUT_WINDOWPANE) layout_fix_offsets(lcchild); yoff += lcchild->sy + 1; } } } /* Update pane offsets and sizes based on their cells. */ void layout_fix_panes(struct window *w, u_int wsx, u_int wsy) { struct window_pane *wp; struct layout_cell *lc; u_int sx, sy; TAILQ_FOREACH(wp, &w->panes, entry) { if ((lc = wp->layout_cell) == NULL) continue; wp->xoff = lc->xoff; wp->yoff = lc->yoff; /* * Layout cells are limited by the smallest size of other cells * within the same row or column; if this isn't the case * resizing becomes difficult. * * However, panes do not have to take up their entire cell, so * they can be cropped to the window edge if the layout * overflows and they are partly visible. * * This stops cells being hidden unnecessarily. */ /* * Work out the horizontal size. If the pane is actually * outside the window or the entire pane is already visible, * don't crop. */ if (lc->xoff >= wsx || lc->xoff + lc->sx < wsx) sx = lc->sx; else { sx = wsx - lc->xoff; if (sx < 1) sx = lc->sx; } /* * Similarly for the vertical size; the minimum vertical size * is two because scroll regions cannot be one line. */ if (lc->yoff >= wsy || lc->yoff + lc->sy < wsy) sy = lc->sy; else { sy = wsy - lc->yoff; if (sy < 2) sy = lc->sy; } window_pane_resize(wp, sx, sy); } } /* Count the number of available cells in a layout. */ u_int layout_count_cells(struct layout_cell *lc) { struct layout_cell *lcchild; u_int n; switch (lc->type) { case LAYOUT_WINDOWPANE: return (1); case LAYOUT_LEFTRIGHT: case LAYOUT_TOPBOTTOM: n = 0; TAILQ_FOREACH(lcchild, &lc->cells, entry) n += layout_count_cells(lcchild); return (n); default: fatalx("bad layout type"); } } /* Calculate how much size is available to be removed from a cell. */ u_int layout_resize_check(struct layout_cell *lc, enum layout_type type) { struct layout_cell *lcchild; u_int available, minimum; if (lc->type == LAYOUT_WINDOWPANE) { /* Space available in this cell only. */ if (type == LAYOUT_LEFTRIGHT) available = lc->sx; else available = lc->sy; if (available > PANE_MINIMUM) available -= PANE_MINIMUM; else available = 0; } else if (lc->type == type) { /* Same type: total of available space in all child cells. */ available = 0; TAILQ_FOREACH(lcchild, &lc->cells, entry) available += layout_resize_check(lcchild, type); } else { /* Different type: minimum of available space in child cells. */ minimum = UINT_MAX; TAILQ_FOREACH(lcchild, &lc->cells, entry) { available = layout_resize_check(lcchild, type); if (available < minimum) minimum = available; } available = minimum; } return (available); } /* * Adjust cell size evenly, including altering its children. This function * expects the change to have already been bounded to the space available. */ void layout_resize_adjust(struct layout_cell *lc, enum layout_type type, int change) { struct layout_cell *lcchild; /* Adjust the cell size. */ if (type == LAYOUT_LEFTRIGHT) lc->sx += change; else lc->sy += change; /* If this is a leaf cell, that is all that is necessary. */ if (type == LAYOUT_WINDOWPANE) return; /* Child cell runs in a different direction. */ if (lc->type != type) { TAILQ_FOREACH(lcchild, &lc->cells, entry) layout_resize_adjust(lcchild, type, change); return; } /* * Child cell runs in the same direction. Adjust each child equally * until no further change is possible. */ while (change != 0) { TAILQ_FOREACH(lcchild, &lc->cells, entry) { if (change == 0) break; if (change > 0) { layout_resize_adjust(lcchild, type, 1); change--; continue; } if (layout_resize_check(lcchild, type) > 0) { layout_resize_adjust(lcchild, type, -1); change++; } } } } /* Destroy a cell and redistribute the space. */ void layout_destroy_cell(struct layout_cell *lc, struct layout_cell **lcroot) { struct layout_cell *lcother, *lcparent; /* * If no parent, this is the last pane so window close is imminent and * there is no need to resize anything. */ lcparent = lc->parent; if (lcparent == NULL) { layout_free_cell(lc); *lcroot = NULL; return; } /* Merge the space into the previous or next cell. */ if (lc == TAILQ_FIRST(&lcparent->cells)) lcother = TAILQ_NEXT(lc, entry); else lcother = TAILQ_PREV(lc, layout_cells, entry); if (lcparent->type == LAYOUT_LEFTRIGHT) layout_resize_adjust(lcother, lcparent->type, lc->sx + 1); else layout_resize_adjust(lcother, lcparent->type, lc->sy + 1); /* Remove this from the parent's list. */ TAILQ_REMOVE(&lcparent->cells, lc, entry); layout_free_cell(lc); /* * If the parent now has one cell, remove the parent from the tree and * replace it by that cell. */ lc = TAILQ_FIRST(&lcparent->cells); if (TAILQ_NEXT(lc, entry) == NULL) { TAILQ_REMOVE(&lcparent->cells, lc, entry); lc->parent = lcparent->parent; if (lc->parent == NULL) { lc->xoff = 0; lc->yoff = 0; *lcroot = lc; } else TAILQ_REPLACE(&lc->parent->cells, lcparent, lc, entry); layout_free_cell(lcparent); } } void layout_init(struct window *w, struct window_pane *wp) { struct layout_cell *lc; lc = w->layout_root = layout_create_cell(NULL); layout_set_size(lc, w->sx, w->sy, 0, 0); layout_make_leaf(lc, wp); layout_fix_panes(w, w->sx, w->sy); } void layout_free(struct window *w) { layout_free_cell(w->layout_root); } /* Resize the entire layout after window resize. */ void layout_resize(struct window *w, u_int sx, u_int sy) { struct layout_cell *lc = w->layout_root; int xlimit, ylimit, xchange, ychange; /* * Adjust horizontally. Do not attempt to reduce the layout lower than * the minimum (more than the amount returned by layout_resize_check). * * This can mean that the window size is smaller than the total layout * size: redrawing this is handled at a higher level, but it does leave * a problem with growing the window size here: if the current size is * < the minimum, growing proportionately by adding to each pane is * wrong as it would keep the layout size larger than the window size. * Instead, spread the difference between the minimum and the new size * out proportionately - this should leave the layout fitting the new * window size. */ xchange = sx - w->sx; xlimit = layout_resize_check(lc, LAYOUT_LEFTRIGHT); if (xchange < 0 && xchange < -xlimit) xchange = -xlimit; if (xlimit == 0) { if (sx <= lc->sx) /* lc->sx is minimum possible */ xchange = 0; else xchange = sx - lc->sx; } if (xchange != 0) layout_resize_adjust(lc, LAYOUT_LEFTRIGHT, xchange); /* Adjust vertically in a similar fashion. */ ychange = sy - w->sy; ylimit = layout_resize_check(lc, LAYOUT_TOPBOTTOM); if (ychange < 0 && ychange < -ylimit) ychange = -ylimit; if (ylimit == 0) { if (sy <= lc->sy) /* lc->sy is minimum possible */ ychange = 0; else ychange = sy - lc->sy; } if (ychange != 0) layout_resize_adjust(lc, LAYOUT_TOPBOTTOM, ychange); /* Fix cell offsets. */ layout_fix_offsets(lc); layout_fix_panes(w, sx, sy); } /* Resize a pane to an absolute size. */ void layout_resize_pane_to(struct window_pane *wp, enum layout_type type, u_int new_size) { struct layout_cell *lc, *lcparent; int change, size; lc = wp->layout_cell; /* Find next parent of the same type. */ lcparent = lc->parent; while (lcparent != NULL && lcparent->type != type) { lc = lcparent; lcparent = lc->parent; } if (lcparent == NULL) return; /* Work out the size adjustment. */ if (type == LAYOUT_LEFTRIGHT) size = lc->sx; else size = lc->sy; if (lc == TAILQ_LAST(&lcparent->cells, layout_cells)) change = size - new_size; else change = new_size - size; /* Resize the pane. */ layout_resize_pane(wp, type, change); } /* Resize a single pane within the layout. */ void layout_resize_pane(struct window_pane *wp, enum layout_type type, int change) { struct layout_cell *lc, *lcparent; int needed, size; lc = wp->layout_cell; /* Find next parent of the same type. */ lcparent = lc->parent; while (lcparent != NULL && lcparent->type != type) { lc = lcparent; lcparent = lc->parent; } if (lcparent == NULL) return; /* If this is the last cell, move back one. */ if (lc == TAILQ_LAST(&lcparent->cells, layout_cells)) lc = TAILQ_PREV(lc, layout_cells, entry); /* Grow or shrink the cell. */ needed = change; while (needed != 0) { if (change > 0) { size = layout_resize_pane_grow(lc, type, needed); needed -= size; } else { size = layout_resize_pane_shrink(lc, type, needed); needed += size; } if (size == 0) /* no more change possible */ break; } /* Fix cell offsets. */ layout_fix_offsets(wp->window->layout_root); layout_fix_panes(wp->window, wp->window->sx, wp->window->sy); notify_window_layout_changed(wp->window); } /* Resize pane based on mouse events. */ void layout_resize_pane_mouse(struct client *c) { struct window *w; struct window_pane *wp; struct mouse_event *m = &c->tty.mouse; int pane_border; w = c->session->curw->window; pane_border = 0; if (m->event & MOUSE_EVENT_DRAG && m->flags & MOUSE_RESIZE_PANE) { TAILQ_FOREACH(wp, &w->panes, entry) { if (!window_pane_visible(wp)) continue; if (wp->xoff + wp->sx == m->lx && wp->yoff <= 1 + m->ly && wp->yoff + wp->sy >= m->ly) { layout_resize_pane(wp, LAYOUT_LEFTRIGHT, m->x - m->lx); pane_border = 1; } if (wp->yoff + wp->sy == m->ly && wp->xoff <= 1 + m->lx && wp->xoff + wp->sx >= m->lx) { layout_resize_pane(wp, LAYOUT_TOPBOTTOM, m->y - m->ly); pane_border = 1; } } if (pane_border) server_redraw_window(w); } else if (m->event & MOUSE_EVENT_DOWN) { TAILQ_FOREACH(wp, &w->panes, entry) { if ((wp->xoff + wp->sx == m->x && wp->yoff <= 1 + m->y && wp->yoff + wp->sy >= m->y) || (wp->yoff + wp->sy == m->y && wp->xoff <= 1 + m->x && wp->xoff + wp->sx >= m->x)) { pane_border = 1; } } } if (pane_border) m->flags |= MOUSE_RESIZE_PANE; else m->flags &= ~MOUSE_RESIZE_PANE; } /* Helper function to grow pane. */ int layout_resize_pane_grow( struct layout_cell *lc, enum layout_type type, int needed) { struct layout_cell *lcadd, *lcremove; u_int size; /* Growing. Always add to the current cell. */ lcadd = lc; /* Look towards the tail for a suitable cell for reduction. */ lcremove = TAILQ_NEXT(lc, entry); while (lcremove != NULL) { size = layout_resize_check(lcremove, type); if (size > 0) break; lcremove = TAILQ_NEXT(lcremove, entry); } /* If none found, look towards the head. */ if (lcremove == NULL) { lcremove = TAILQ_PREV(lc, layout_cells, entry); while (lcremove != NULL) { size = layout_resize_check(lcremove, type); if (size > 0) break; lcremove = TAILQ_PREV(lcremove, layout_cells, entry); } if (lcremove == NULL) return (0); } /* Change the cells. */ if (size > (u_int) needed) size = needed; layout_resize_adjust(lcadd, type, size); layout_resize_adjust(lcremove, type, -size); return (size); } /* Helper function to shrink pane. */ int layout_resize_pane_shrink( struct layout_cell *lc, enum layout_type type, int needed) { struct layout_cell *lcadd, *lcremove; u_int size; /* Shrinking. Find cell to remove from by walking towards head. */ lcremove = lc; do { size = layout_resize_check(lcremove, type); if (size != 0) break; lcremove = TAILQ_PREV(lcremove, layout_cells, entry); } while (lcremove != NULL); if (lcremove == NULL) return (0); /* And add onto the next cell (from the original cell). */ lcadd = TAILQ_NEXT(lc, entry); if (lcadd == NULL) return (0); /* Change the cells. */ if (size > (u_int) -needed) size = -needed; layout_resize_adjust(lcadd, type, size); layout_resize_adjust(lcremove, type, -size); return (size); } /* Assign window pane to newly split cell. */ void layout_assign_pane(struct layout_cell *lc, struct window_pane *wp) { layout_make_leaf(lc, wp); layout_fix_panes(wp->window, wp->window->sx, wp->window->sy); } /* * Split a pane into two. size is a hint, or -1 for default half/half * split. This must be followed by layout_assign_pane before much else happens! **/ struct layout_cell * layout_split_pane( struct window_pane *wp, enum layout_type type, int size, int insert_before) { struct layout_cell *lc, *lcparent, *lcnew, *lc1, *lc2; u_int sx, sy, xoff, yoff, size1, size2; lc = wp->layout_cell; /* Copy the old cell size. */ sx = lc->sx; sy = lc->sy; xoff = lc->xoff; yoff = lc->yoff; /* Check there is enough space for the two new panes. */ switch (type) { case LAYOUT_LEFTRIGHT: if (sx < PANE_MINIMUM * 2 + 1) return (NULL); break; case LAYOUT_TOPBOTTOM: if (sy < PANE_MINIMUM * 2 + 1) return (NULL); break; default: fatalx("bad layout type"); } if (lc->parent != NULL && lc->parent->type == type) { /* * If the parent exists and is of the same type as the split, * create a new cell and insert it after this one. */ /* Create the new child cell. */ lcparent = lc->parent; lcnew = layout_create_cell(lcparent); if (insert_before) TAILQ_INSERT_BEFORE(lc, lcnew, entry); else TAILQ_INSERT_AFTER(&lcparent->cells, lc, lcnew, entry); } else { /* * Otherwise create a new parent and insert it. */ /* Create and insert the replacement parent. */ lcparent = layout_create_cell(lc->parent); layout_make_node(lcparent, type); layout_set_size(lcparent, sx, sy, xoff, yoff); if (lc->parent == NULL) wp->window->layout_root = lcparent; else TAILQ_REPLACE(&lc->parent->cells, lc, lcparent, entry); /* Insert the old cell. */ lc->parent = lcparent; TAILQ_INSERT_HEAD(&lcparent->cells, lc, entry); /* Create the new child cell. */ lcnew = layout_create_cell(lcparent); if (insert_before) TAILQ_INSERT_HEAD(&lcparent->cells, lcnew, entry); else TAILQ_INSERT_TAIL(&lcparent->cells, lcnew, entry); } if (insert_before) { lc1 = lcnew; lc2 = lc; } else { lc1 = lc; lc2 = lcnew; } /* Set new cell sizes. size is the target size or -1 for middle split, * size1 is the size of the top/left and size2 the bottom/right. */ switch (type) { case LAYOUT_LEFTRIGHT: if (size < 0) size2 = ((sx + 1) / 2) - 1; else size2 = size; if (size2 < PANE_MINIMUM) size2 = PANE_MINIMUM; else if (size2 > sx - 2) size2 = sx - 2; size1 = sx - 1 - size2; layout_set_size(lc1, size1, sy, xoff, yoff); layout_set_size(lc2, size2, sy, xoff + lc1->sx + 1, yoff); break; case LAYOUT_TOPBOTTOM: if (size < 0) size2 = ((sy + 1) / 2) - 1; else size2 = size; if (size2 < PANE_MINIMUM) size2 = PANE_MINIMUM; else if (size2 > sy - 2) size2 = sy - 2; size1 = sy - 1 - size2; layout_set_size(lc1, sx, size1, xoff, yoff); layout_set_size(lc2, sx, size2, xoff, yoff + lc1->sy + 1); break; default: fatalx("bad layout type"); } /* Assign the panes. */ layout_make_leaf(lc, wp); return (lcnew); } /* Destroy the cell associated with a pane. */ void layout_close_pane(struct window_pane *wp) { /* Remove the cell. */ layout_destroy_cell(wp->layout_cell, &wp->window->layout_root); /* Fix pane offsets and sizes. */ if (wp->window->layout_root != NULL) { layout_fix_offsets(wp->window->layout_root); layout_fix_panes(wp->window, wp->window->sx, wp->window->sy); } notify_window_layout_changed(wp->window); }