gdb/tui/tui-layout.h

   1 /* TUI layout window management.
   2
   3    Copyright (C) 1998-2023 Free Software Foundation, Inc.
   4
   5    Contributed by Hewlett-Packard Company.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22 #ifndef TUI_TUI_LAYOUT_H
  23 #define TUI_TUI_LAYOUT_H
  24
  25 #include "ui-file.h"
  26
  27 #include "tui/tui.h"
  28 #include "tui/tui-data.h"
  29 #include "gdbsupport/iterator-range.h"
  30
  31 #include <unordered_map>
  32
  33 /* Values that can be returned when handling a request to adjust a
  34    window's size.  */
  35 enum tui_adjust_result
  36 {
  37   /* Requested window was not found here.  */
  38   NOT_FOUND,
  39   /* Window was found but not handled.  */
  40   FOUND,
  41   /* Window was found and handled.  */
  42   HANDLED
  43 };
  44
  45 /* The basic object in a TUI layout.  This represents a single piece
  46    of screen real estate.  Subclasses determine the exact
  47    behavior.  */
  48 class tui_layout_base
  49 {
  50 public:
  51
  52   DISABLE_COPY_AND_ASSIGN (tui_layout_base);
  53
  54   virtual ~tui_layout_base () = default;
  55
  56   /* Clone this object.  Ordinarily a layout is cloned before it is
  57      used, so that any necessary modifications do not affect the
  58      "skeleton" layout.  */
  59   virtual std::unique_ptr<tui_layout_base> clone () const = 0;
  60
  61   /* Change the size and location of this layout.  When
  62      PRESERVE_CMD_WIN_SIZE_P is true the current size of the TUI_CMD_WIN
  63      is preserved, otherwise, the TUI_CMD_WIN will resize just like any
  64      other window.  */
  65   virtual void apply (int x, int y, int width, int height,
  66                       bool preserve_cmd_win_size_p) = 0;
  67
  68   /* Return the minimum and maximum height or width of this layout.
  69      HEIGHT is true to fetch height, false to fetch width.  */
  70   virtual void get_sizes (bool height, int *min_value, int *max_value) = 0;
  71
  72   /* True if the topmost (for vertical layouts), or the leftmost (for
  73      horizontal layouts) item in this layout is boxed.  */
  74   virtual bool first_edge_has_border_p () const = 0;
  75
  76   /* True if the bottommost (for vertical layouts), or the rightmost (for
  77      horizontal layouts) item in this layout is boxed.  */
  78   virtual bool last_edge_has_border_p () const = 0;
  79
  80   /* Return the name of this layout's window, or nullptr if this
  81      layout does not represent a single window.  */
  82   virtual const char *get_name () const
  83   {
  84     return nullptr;
  85   }
  86
  87   /* Set the height of the window named NAME to NEW_HEIGHT, updating
  88      the sizes of the other windows around it.  */
  89   virtual tui_adjust_result set_height (const char *name, int new_height) = 0;
  90
  91   /* Set the width of the window named NAME to NEW_WIDTH, updating
  92      the sizes of the other windows around it.  */
  93   virtual tui_adjust_result set_width (const char *name, int new_width) = 0;
  94
  95   /* Remove some windows from the layout, leaving the command window
  96      and the window being passed in here.  */
  97   virtual void remove_windows (const char *name) = 0;
  98
  99   /* Replace the window named NAME in the layout with the window named
 100      NEW_WINDOW.  */
 101   virtual void replace_window (const char *name, const char *new_window) = 0;
 102
 103   /* Append the specification to this window to OUTPUT.  DEPTH is the
 104      depth of this layout in the hierarchy (zero-based).  */
 105   virtual void specification (ui_file *output, int depth) = 0;
 106
 107   /* Return a FINGERPRINT string containing an abstract representation of
 108      the location of the cmd window in this layout.
 109
 110      When called on a complete, top-level layout, the fingerprint will be a
 111      non-empty string made of 'V' and 'H' characters, followed by a single
 112      'C' character.  Each 'V' and 'H' represents a vertical or horizontal
 113      layout that must be passed through in order to find the cmd
 114      window.  A vertical or horizontal layout of just one window does not add
 115      a 'V' or 'H' character.
 116
 117      Of course, layouts are built recursively, so, when called on a partial
 118      layout, if this object represents a single window, then either the
 119      empty string is returned (for non-cmd windows), or a string
 120      containing a single 'C' is returned.
 121
 122      For object representing layouts, if the layout contains the cmd
 123      window then we will get back a valid fingerprint string (may contain 'V'
 124      and 'H', ends with 'C'), or, if this layout doesn't contain the cmd
 125      window, an empty string is returned.  */
 126   virtual std::string layout_fingerprint () const = 0;
 127
 128   /* Add all windows to the WINDOWS vector.  */
 129   virtual void get_windows (std::vector<tui_win_info *> *windows) = 0;
 130
 131   /* The most recent space allocation.  */
 132   int x = 0;
 133   int y = 0;
 134   int width = 0;
 135   int height = 0;
 136
 137 protected:
 138
 139   tui_layout_base () = default;
 140 };
 141
 142 /* A TUI layout object that displays a single window.  The window is
 143    given by name.  */
 144 class tui_layout_window : public tui_layout_base
 145 {
 146 public:
 147
 148   explicit tui_layout_window (const char *name)
 149     : m_contents (name)
 150   {
 151   }
 152
 153   DISABLE_COPY_AND_ASSIGN (tui_layout_window);
 154
 155   std::unique_ptr<tui_layout_base> clone () const override;
 156
 157   void apply (int x, int y, int width, int height,
 158               bool preserve_cmd_win_size_p) override;
 159
 160   const char *get_name () const override
 161   {
 162     return m_contents.c_str ();
 163   }
 164
 165   tui_adjust_result set_height (const char *name, int new_height) override
 166   {
 167     return m_contents == name ? FOUND : NOT_FOUND;
 168   }
 169
 170   tui_adjust_result set_width (const char *name, int new_width) override
 171   {
 172     return m_contents == name ? FOUND : NOT_FOUND;
 173   }
 174
 175   bool first_edge_has_border_p () const override;
 176
 177   bool last_edge_has_border_p () const override;
 178
 179   void remove_windows (const char *name) override
 180   {
 181   }
 182
 183   void replace_window (const char *name, const char *new_window) override;
 184
 185   void specification (ui_file *output, int depth) override;
 186
 187   std::string layout_fingerprint () const override;
 188
 189   /* See tui_layout_base::get_windows.  */
 190   void get_windows (std::vector<tui_win_info *> *windows) override
 191   {
 192     windows->push_back (m_window);
 193   }
 194
 195 protected:
 196
 197   void get_sizes (bool height, int *min_value, int *max_value) override;
 198
 199 private:
 200
 201   /* Type of content to display.  */
 202   std::string m_contents;
 203
 204   /* When a layout is applied, this is updated to point to the window
 205      object.  */
 206   tui_win_info *m_window = nullptr;
 207 };
 208
 209 /* A TUI layout that holds other layouts.  */
 210 class tui_layout_split : public tui_layout_base
 211 {
 212 public:
 213
 214   /* Create a new layout.  If VERTICAL is true, then windows in this
 215      layout will be arranged vertically.  */
 216   explicit tui_layout_split (bool vertical = true)
 217     : m_vertical (vertical)
 218   {
 219   }
 220
 221   DISABLE_COPY_AND_ASSIGN (tui_layout_split);
 222
 223   /* Add a new split layout to this layout.  WEIGHT is the desired
 224      size, which is relative to the other weights given in this
 225      layout.  */
 226   void add_split (std::unique_ptr<tui_layout_split> &&layout, int weight);
 227
 228   /* Add a new window to this layout.  NAME is the name of the window
 229      to add.  WEIGHT is the desired size, which is relative to the
 230      other weights given in this layout.  */
 231   void add_window (const char *name, int weight);
 232
 233   std::unique_ptr<tui_layout_base> clone () const override;
 234
 235   void apply (int x, int y, int width, int height,
 236               bool preserve_cmd_win_size_p) override;
 237
 238   tui_adjust_result set_height (const char *name, int new_height) override
 239   {
 240     /* Pass false as the final argument to indicate change of height.  */
 241     return set_size (name, new_height, false);
 242   }
 243
 244   tui_adjust_result set_width (const char *name, int new_width) override
 245   {
 246     /* Pass true as the final argument to indicate change of width.  */
 247     return set_size (name, new_width, true);
 248   }
 249
 250   bool first_edge_has_border_p () const override;
 251
 252   bool last_edge_has_border_p () const override;
 253
 254   void remove_windows (const char *name) override;
 255
 256   void replace_window (const char *name, const char *new_window) override;
 257
 258   void specification (ui_file *output, int depth) override;
 259
 260   std::string layout_fingerprint () const override;
 261
 262   /* See tui_layout_base::get_windows.  */
 263   void get_windows (std::vector<tui_win_info *> *windows) override
 264   {
 265     for (auto &item : m_splits)
 266       item.layout->get_windows (windows);
 267   }
 268
 269 protected:
 270
 271   void get_sizes (bool height, int *min_value, int *max_value) override;
 272
 273 private:
 274
 275   /* Used to implement set_height and set_width member functions.  When
 276      SET_WIDTH_P is true, set the width, otherwise, set the height of the
 277      window named NAME to NEW_SIZE, updating the sizes of the other windows
 278      around it as needed.  The result indicates if the window NAME was
 279      found and had its size adjusted, was found but was not adjusted, or
 280      was not found at all.  */
 281   tui_adjust_result set_size (const char *name, int new_size,
 282                               bool set_width_p);
 283
 284   /* Set the weights from the current heights (when m_vertical is true) or
 285      widths (when m_vertical is false).  */
 286   void set_weights_from_sizes ();
 287
 288   /* Structure used when resizing, or applying a layout.  An instance of
 289      this structure is created for each sub-layout.  */
 290   struct size_info
 291   {
 292     /* The calculated size for this sub-layout.  */
 293     int size;
 294
 295     /* The minimum and maximum sizes for this sub-layout, obtained by
 296        calling the get_sizes member function.  */
 297     int min_size;
 298     int max_size;
 299
 300     /* True if this window will share a box border with the previous
 301        window in the list.  */
 302     bool share_box;
 303   };
 304
 305   /* Used for debug, prints the contents of INFO using tui_debug_printf.
 306      Only call this when the global debug_tui is true.  */
 307   static void tui_debug_print_size_info (const std::vector<size_info> &info);
 308
 309   /* Used for debug, returns a string describing the current weight of each
 310      sub-layout.  */
 311   std::string tui_debug_weights_to_string () const;
 312
 313   struct split
 314   {
 315     /* The requested weight.  */
 316     int weight;
 317     /* The layout.  */
 318     std::unique_ptr<tui_layout_base> layout;
 319   };
 320
 321   /* The splits.  */
 322   std::vector<split> m_splits;
 323
 324   /* True if the windows in this split are arranged vertically.  */
 325   bool m_vertical;
 326 };
 327
 328 /* Add the specified window to the layout in a logical way.  This
 329    means setting up the most logical layout given the window to be
 330    added.  Only the source or disassembly window can be added this
 331    way.  */
 332 extern void tui_add_win_to_layout (enum tui_win_type);
 333
 334 /* Set the initial layout.  */
 335 extern void tui_set_initial_layout ();
 336
 337 /* Switch to the next layout.  */
 338 extern void tui_next_layout ();
 339
 340 /* Show the register window.  Like "layout regs".  */
 341 extern void tui_regs_layout ();
 342
 343 /* Remove some windows from the layout, leaving only the focused
 344    window and the command window; if no window has the focus, then
 345    some other window is chosen to remain.  */
 346 extern void tui_remove_some_windows ();
 347
 348 /* Apply the current layout.  When PRESERVE_CMD_WIN_SIZE_P is true the
 349    current size of the TUI_CMD_WIN is preserved, otherwise, the TUI_CMD_WIN
 350    will resize just like any other window.  */
 351 extern void tui_apply_current_layout (bool);
 352
 353 /* Adjust the window height of WIN to NEW_HEIGHT.  */
 354 extern void tui_adjust_window_height (struct tui_win_info *win,
 355                                       int new_height);
 356
 357 /* Adjust the window width of WIN to NEW_WIDTH.  */
 358 extern void tui_adjust_window_width (struct tui_win_info *win,
 359                                      int new_width);
 360
 361 /* The type of a function that is used to create a TUI window.  */
 362
 363 typedef std::function<tui_win_info * (const char *name)> window_factory;
 364
 365 /* The type for a data structure that maps a window name to that window's
 366    factory function.  */
 367 typedef std::unordered_map<std::string, window_factory> window_types_map;
 368
 369 /* Register a new TUI window type.  NAME is the name of the window
 370    type.  FACTORY is a function that can be called to instantiate the
 371    window.  */
 372
 373 extern void tui_register_window (const char *name, window_factory &&factory);
 374
 375 /* An iterator class that exposes just the window names from the
 376    known_window_types map in tui-layout.c.  This is just a wrapper around
 377    an iterator of the underlying known_window_types map, but this just
 378    exposes the window names.  */
 379
 380 struct known_window_names_iterator
 381 {
 382   using known_window_types_iterator = window_types_map::iterator;
 383
 384   known_window_names_iterator (known_window_types_iterator &&iter)
 385     : m_iter (std::move (iter))
 386   { /* Nothing.  */ }
 387
 388   known_window_names_iterator &operator++ ()
 389   {
 390     ++m_iter;
 391     return *this;
 392   }
 393
 394   const std::string &operator* () const
 395   { return (*m_iter).first; }
 396
 397   bool operator!= (const known_window_names_iterator &other) const
 398   { return m_iter != other.m_iter; }
 399
 400 private:
 401
 402   /* The underlying iterator.  */
 403   known_window_types_iterator m_iter;
 404 };
 405
 406 /* A range adapter that makes it possible to iterate over the names of all
 407    known tui windows.  */
 408
 409 using known_window_names_range
 410   = iterator_range<known_window_names_iterator>;
 411
 412 /* Return a range that can be used to walk over the name of all known tui
 413    windows in a range-for loop.  */
 414
 415 extern known_window_names_range all_known_window_names ();
 416
 417 #endif /* TUI_TUI_LAYOUT_H */