mutt_window.c

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#include "config.h"
#include <stdarg.h>
#include <string.h>
#include "mutt/lib.h"
#include "config/lib.h"
#include "core/lib.h"
#include "debug/lib.h"
#include "mutt_window.h"
#include "mutt_curses.h"
#include "mutt_globals.h"
#include "mutt_menu.h"
#include "options.h"
#include "reflow.h"

struct MuttWindow *RootWindow = NULL;        
struct MuttWindow *MuttDialogWindow = NULL;  
struct MuttWindow *MuttHelpWindow = NULL;    
struct MuttWindow *MuttMessageWindow = NULL; 

static void window_notify(struct MuttWindow *win)
{
  if (!win->notify)
    return;

  const struct WindowState *old = &win->old;
  const struct WindowState *new = &win->state;
  WindowNotifyFlags flags = WN_NO_FLAGS;

  if (new->visible != old->visible)
    flags |= new->visible ? WN_VISIBLE : WN_HIDDEN;

  if ((new->row_offset != old->row_offset) || (new->col_offset != old->col_offset))
    flags |= WN_MOVED;

  if (new->rows > old->rows)
    flags |= WN_TALLER;
  else if (new->rows < old->rows)
    flags |= WN_SHORTER;

  if (new->cols > old->cols)
    flags |= WN_WIDER;
  else if (new->cols < old->cols)
    flags |= WN_NARROWER;

  if (flags == WN_NO_FLAGS)
    return;

  struct EventWindow ev_w = { win, flags };
  notify_send(win->notify, NT_WINDOW, NT_WINDOW_STATE, &ev_w);
  win->old = win->state;
}

void window_notify_all(struct MuttWindow *win)
{
  if (!win)
    win = RootWindow;

  window_notify(win);

  struct MuttWindow *np = NULL;
  TAILQ_FOREACH(np, &win->children, entries)
  {
    window_notify_all(np);
  }
}

void window_set_visible(struct MuttWindow *win, bool visible)
{
  if (!win)
    win = RootWindow;

  win->state.visible = visible;

  struct MuttWindow *np = NULL;
  TAILQ_FOREACH(np, &win->children, entries)
  {
    window_set_visible(np, visible);
  }
}

struct MuttWindow *mutt_window_new(enum WindowType type, enum MuttWindowOrientation orient,
                                   enum MuttWindowSize size, int cols, int rows)
{
  struct MuttWindow *win = mutt_mem_calloc(1, sizeof(struct MuttWindow));

  win->type = type;
  win->orient = orient;
  win->size = size;
  win->req_rows = rows;
  win->req_cols = cols;
  win->state.visible = true;
  win->notify = notify_new();
  TAILQ_INIT(&win->children);
  return win;
}

void mutt_window_free(struct MuttWindow **ptr)
{
  if (!ptr || !*ptr)
    return;

  struct MuttWindow *win = *ptr;

  struct EventWindow ev_w = { win, WN_NO_FLAGS };
  notify_send(win->notify, NT_WINDOW, NT_WINDOW_DELETE, &ev_w);

  mutt_winlist_free(&win->children);

  if (win->wdata && win->wdata_free)
    win->wdata_free(win, &win->wdata); // Custom function to free private data

  notify_free(&win->notify);

  FREE(ptr);
}

#ifdef USE_SLANG_CURSES

static int vw_printw(SLcurses_Window_Type *win, const char *fmt, va_list ap)
{
  char buf[1024];

  (void) SLvsnprintf(buf, sizeof(buf), (char *) fmt, ap);
  SLcurses_waddnstr(win, buf, -1);
  return 0;
}
#endif

void mutt_window_clearline(struct MuttWindow *win, int row)
{
  mutt_window_move(win, 0, row);
  mutt_window_clrtoeol(win);
}

void mutt_window_clrtobot(void)
{
  clrtobot();
}

void mutt_window_clrtoeol(struct MuttWindow *win)
{
  if (!win || !stdscr)
    return;

  if (win->state.col_offset + win->state.cols == COLS)
    clrtoeol();
  else
  {
    int row = 0;
    int col = 0;
    getyx(stdscr, row, col);
    int curcol = col;
    while (curcol < (win->state.col_offset + win->state.cols))
    {
      addch(' ');
      curcol++;
    }
    move(row, col);
  }
}

static int mutt_dlg_rootwin_observer(struct NotifyCallback *nc)
{
  if (!nc->event_data || !nc->global_data)
    return -1;
  if (nc->event_type != NT_CONFIG)
    return 0;

  struct EventConfig *ec = nc->event_data;
  struct MuttWindow *root_win = nc->global_data;

  if (mutt_str_equal(ec->name, "help"))
  {
    MuttHelpWindow->state.visible = C_Help;
    goto reflow;
  }

  if (mutt_str_equal(ec->name, "status_on_top"))
  {
    struct MuttWindow *first = TAILQ_FIRST(&root_win->children);
    if (!first)
      return -1;

    if ((C_StatusOnTop && (first->type == WT_HELP_BAR)) ||
        (!C_StatusOnTop && (first->type != WT_HELP_BAR)))
    {
      // Swap the HelpLine and the Dialogs Container
      struct MuttWindow *next = TAILQ_NEXT(first, entries);
      if (!next)
        return -1;
      TAILQ_REMOVE(&root_win->children, next, entries);
      TAILQ_INSERT_HEAD(&root_win->children, next, entries);
    }
  }

reflow:
  mutt_window_reflow(root_win);
  return 0;
}

void mutt_window_free_all(void)
{
  if (NeoMutt)
    notify_observer_remove(NeoMutt->notify, mutt_dlg_rootwin_observer, RootWindow);
  MuttDialogWindow = NULL;
  MuttHelpWindow = NULL;
  MuttMessageWindow = NULL;
  mutt_window_free(&RootWindow);
}

void mutt_window_get_coords(struct MuttWindow *win, int *col, int *row)
{
  int x = 0;
  int y = 0;

  getyx(stdscr, y, x);
  if (col)
    *col = x - win->state.col_offset;
  if (row)
    *row = y - win->state.row_offset;
}

void mutt_window_init(void)
{
  if (RootWindow)
    return;

  RootWindow =
      mutt_window_new(WT_ROOT, MUTT_WIN_ORIENT_VERTICAL, MUTT_WIN_SIZE_FIXED, 0, 0);
  notify_set_parent(RootWindow->notify, NeoMutt->notify);

  MuttHelpWindow = mutt_window_new(WT_HELP_BAR, MUTT_WIN_ORIENT_VERTICAL,
                                   MUTT_WIN_SIZE_FIXED, MUTT_WIN_SIZE_UNLIMITED, 1);
  MuttHelpWindow->state.visible = C_Help;

  MuttDialogWindow = mutt_window_new(WT_ALL_DIALOGS, MUTT_WIN_ORIENT_VERTICAL,
                                     MUTT_WIN_SIZE_MAXIMISE, MUTT_WIN_SIZE_UNLIMITED,
                                     MUTT_WIN_SIZE_UNLIMITED);

  MuttMessageWindow = mutt_window_new(WT_MESSAGE, MUTT_WIN_ORIENT_VERTICAL,
                                      MUTT_WIN_SIZE_FIXED, MUTT_WIN_SIZE_UNLIMITED, 1);

  if (C_StatusOnTop)
  {
    mutt_window_add_child(RootWindow, MuttDialogWindow);
    mutt_window_add_child(RootWindow, MuttHelpWindow);
  }
  else
  {
    mutt_window_add_child(RootWindow, MuttHelpWindow);
    mutt_window_add_child(RootWindow, MuttDialogWindow);
  }

  mutt_window_add_child(RootWindow, MuttMessageWindow);
  notify_observer_add(NeoMutt->notify, mutt_dlg_rootwin_observer, RootWindow);
}

int mutt_window_move(struct MuttWindow *win, int col, int row)
{
  return move(win->state.row_offset + row, win->state.col_offset + col);
}

int mutt_window_mvaddstr(struct MuttWindow *win, int col, int row, const char *str)
{
#ifdef USE_SLANG_CURSES
  return mvaddstr(win->state.row_offset + row, win->state.col_offset + col, (char *) str);
#else
  return mvaddstr(win->state.row_offset + row, win->state.col_offset + col, str);
#endif
}

int mutt_window_mvprintw(struct MuttWindow *win, int col, int row, const char *fmt, ...)
{
  int rc = mutt_window_move(win, col, row);
  if (rc == ERR)
    return rc;

  va_list ap;
  va_start(ap, fmt);
  rc = vw_printw(stdscr, fmt, ap);
  va_end(ap);

  return rc;
}

void mutt_window_copy_size(const struct MuttWindow *win_src, struct MuttWindow *win_dst)
{
  if (!win_src || !win_dst)
    return;

  win_dst->state.rows = win_src->state.rows;
  win_dst->state.cols = win_src->state.cols;
  win_dst->state.row_offset = win_src->state.row_offset;
  win_dst->state.col_offset = win_src->state.col_offset;
}

void mutt_window_reflow(struct MuttWindow *win)
{
  if (OptNoCurses)
    return;

  if (!win)
    win = RootWindow;

  mutt_debug(LL_DEBUG2, "entering\n");
  window_reflow(win);
  window_notify_all(win);

  mutt_menu_set_current_redraw_full();
  /* the pager menu needs this flag set to recalc line_info */
  mutt_menu_set_current_redraw(REDRAW_FLOW);
#ifdef USE_DEBUG_WINDOW
  debug_win_dump();
#endif
}

void mutt_window_reflow_message_rows(int mw_rows)
{
  MuttMessageWindow->req_rows = mw_rows;
  mutt_window_reflow(MuttMessageWindow->parent);

  /* We don't also set REDRAW_FLOW because this function only
   * changes rows and is a temporary adjustment. */
  mutt_menu_set_current_redraw_full();
}

int mutt_window_wrap_cols(int width, short wrap)
{
  if (wrap < 0)
    return (width > -wrap) ? (width + wrap) : width;
  if (wrap)
    return (wrap < width) ? wrap : width;
  return width;
}

int mutt_window_addch(int ch)
{
  return addch(ch);
}

int mutt_window_addnstr(const char *str, int num)
{
  if (!str)
    return -1;

#ifdef USE_SLANG_CURSES
  return addnstr((char *) str, num);
#else
  return addnstr(str, num);
#endif
}

int mutt_window_addstr(const char *str)
{
  if (!str)
    return -1;

#ifdef USE_SLANG_CURSES
  return addstr((char *) str);
#else
  return addstr(str);
#endif
}

void mutt_window_move_abs(int col, int row)
{
  move(row, col);
}

int mutt_window_printf(const char *fmt, ...)
{
  va_list ap;
  va_start(ap, fmt);
  int rc = vw_printw(stdscr, fmt, ap);
  va_end(ap);

  return rc;
}

void mutt_window_add_child(struct MuttWindow *parent, struct MuttWindow *child)
{
  if (!parent || !child)
    return;

  TAILQ_INSERT_TAIL(&parent->children, child, entries);
  child->parent = parent;

  notify_set_parent(child->notify, parent->notify);

  struct EventWindow ev_w = { child, WN_NO_FLAGS };
  notify_send(child->notify, NT_WINDOW, NT_WINDOW_NEW, &ev_w);
}

struct MuttWindow *mutt_window_remove_child(struct MuttWindow *parent, struct MuttWindow *child)
{
  if (!parent || !child)
    return NULL;

  struct EventWindow ev_w = { child, WN_NO_FLAGS };
  notify_send(child->notify, NT_WINDOW, NT_WINDOW_DELETE, &ev_w);

  TAILQ_REMOVE(&parent->children, child, entries);
  child->parent = NULL;

  notify_set_parent(child->notify, NULL);

  return child;
}

void mutt_winlist_free(struct MuttWindowList *head)
{
  if (!head)
    return;

  struct MuttWindow *np = NULL;
  struct MuttWindow *tmp = NULL;
  TAILQ_FOREACH_SAFE(np, head, entries, tmp)
  {
    TAILQ_REMOVE(head, np, entries);
    mutt_winlist_free(&np->children);
    mutt_window_free(&np);
  }
}

void mutt_window_set_root(int cols, int rows)
{
  if (!RootWindow)
    return;

  bool changed = false;

  if (RootWindow->state.rows != rows)
  {
    RootWindow->state.rows = rows;
    changed = true;
  }

  if (RootWindow->state.cols != cols)
  {
    RootWindow->state.cols = cols;
    changed = true;
  }

  if (changed)
  {
    mutt_window_reflow(RootWindow);
  }
}

bool mutt_window_is_visible(struct MuttWindow *win)
{
  if (!win)
    return false;

  for (; win; win = win->parent)
  {
    if (!win->state.visible)
      return false;
  }

  return true;
}

struct MuttWindow *mutt_window_dialog(struct MuttWindow *win)
{
  for (; win && win->parent; win = win->parent)
  {
    if (win->parent->type == WT_ALL_DIALOGS)
      return win;
  }

  return NULL;
}

struct MuttWindow *mutt_window_find(struct MuttWindow *root, enum WindowType type)
{
  if (!root)
    return NULL;
  if (root->type == type)
    return root;

  struct MuttWindow *np = NULL;
  struct MuttWindow *match = NULL;
  TAILQ_FOREACH(np, &root->children, entries)
  {
    match = mutt_window_find(np, type);
    if (match)
      return match;
  }

  return NULL;
}

void dialog_push(struct MuttWindow *dlg)
{
  if (!dlg || !MuttDialogWindow)
    return;

  struct MuttWindow *last = TAILQ_LAST(&MuttDialogWindow->children, MuttWindowList);
  if (last)
    last->state.visible = false;

  TAILQ_INSERT_TAIL(&MuttDialogWindow->children, dlg, entries);
  notify_set_parent(dlg->notify, MuttDialogWindow->notify);

  // Notify the world, allowing plugins to integrate
  struct EventWindow ev_w = { dlg, WN_VISIBLE };
  notify_send(dlg->notify, NT_WINDOW, NT_WINDOW_DIALOG, &ev_w);

  dlg->state.visible = true;
  dlg->parent = MuttDialogWindow;
  mutt_window_reflow(MuttDialogWindow);
#ifdef USE_DEBUG_WINDOW
  debug_win_dump();
#endif
}

void dialog_pop(void)
{
  if (!MuttDialogWindow)
    return;

  struct MuttWindow *last = TAILQ_LAST(&MuttDialogWindow->children, MuttWindowList);
  if (!last)
    return;

  // Notify the world, allowing plugins to clean up
  struct EventWindow ev_w = { last, WN_HIDDEN };
  notify_send(last->notify, NT_WINDOW, NT_WINDOW_DIALOG, &ev_w);

  last->state.visible = false;
  last->parent = NULL;
  TAILQ_REMOVE(&MuttDialogWindow->children, last, entries);

  last = TAILQ_LAST(&MuttDialogWindow->children, MuttWindowList);
  if (last)
  {
    last->state.visible = true;
    mutt_window_reflow(MuttDialogWindow);
  }
  mutt_menu_set_current_redraw(REDRAW_FULL);
#ifdef USE_DEBUG_WINDOW
  debug_win_dump();
#endif
}

void window_recalc(struct MuttWindow *win)
{
  if (!win)
    return;

  if (win->recalc)
    win->recalc(win, false);

  struct MuttWindow *np = NULL;
  TAILQ_FOREACH(np, &win->children, entries)
  {
    if (np->recalc)
      np->recalc(np, false);
  }
}

void window_repaint(struct MuttWindow *win)
{
  if (!win)
    return;

  if (win->repaint)
    win->repaint(win, false);

  struct MuttWindow *np = NULL;
  TAILQ_FOREACH(np, &win->children, entries)
  {
    if (np->repaint)
      np->repaint(np, false);
  }
}

void window_redraw(struct MuttWindow *win)
{
  if (!win)
    return;

  window_reflow(win);
  window_notify_all(win);

  window_recalc(win);
  window_repaint(win);
}