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Diffstat (limited to 'external/include/stb_textedit.h')
| -rw-r--r-- | external/include/stb_textedit.h | 1322 |
1 files changed, 0 insertions, 1322 deletions
diff --git a/external/include/stb_textedit.h b/external/include/stb_textedit.h deleted file mode 100644 index 4b731a0..0000000 --- a/external/include/stb_textedit.h +++ /dev/null @@ -1,1322 +0,0 @@ -// [ImGui] this is a slightly modified version of stb_truetype.h 1.9. Those changes would need to be pushed into nothings/sb -// [ImGui] - fixed linestart handler when over last character of multi-line buffer + simplified existing code (#588, #815) -// [ImGui] - fixed a state corruption/crash bug in stb_text_redo and stb_textedit_discard_redo (#715) -// [ImGui] - fixed a crash bug in stb_textedit_discard_redo (#681) -// [ImGui] - fixed some minor warnings - -// stb_textedit.h - v1.9 - public domain - Sean Barrett -// Development of this library was sponsored by RAD Game Tools -// -// This C header file implements the guts of a multi-line text-editing -// widget; you implement display, word-wrapping, and low-level string -// insertion/deletion, and stb_textedit will map user inputs into -// insertions & deletions, plus updates to the cursor position, -// selection state, and undo state. -// -// It is intended for use in games and other systems that need to build -// their own custom widgets and which do not have heavy text-editing -// requirements (this library is not recommended for use for editing large -// texts, as its performance does not scale and it has limited undo). -// -// Non-trivial behaviors are modelled after Windows text controls. -// -// -// LICENSE -// -// This software is dual-licensed to the public domain and under the following -// license: you are granted a perpetual, irrevocable license to copy, modify, -// publish, and distribute this file as you see fit. -// -// -// DEPENDENCIES -// -// Uses the C runtime function 'memmove', which you can override -// by defining STB_TEXTEDIT_memmove before the implementation. -// Uses no other functions. Performs no runtime allocations. -// -// -// VERSION HISTORY -// -// 1.9 (2016-08-27) customizable move-by-word -// 1.8 (2016-04-02) better keyboard handling when mouse button is down -// 1.7 (2015-09-13) change y range handling in case baseline is non-0 -// 1.6 (2015-04-15) allow STB_TEXTEDIT_memmove -// 1.5 (2014-09-10) add support for secondary keys for OS X -// 1.4 (2014-08-17) fix signed/unsigned warnings -// 1.3 (2014-06-19) fix mouse clicking to round to nearest char boundary -// 1.2 (2014-05-27) fix some RAD types that had crept into the new code -// 1.1 (2013-12-15) move-by-word (requires STB_TEXTEDIT_IS_SPACE ) -// 1.0 (2012-07-26) improve documentation, initial public release -// 0.3 (2012-02-24) bugfixes, single-line mode; insert mode -// 0.2 (2011-11-28) fixes to undo/redo -// 0.1 (2010-07-08) initial version -// -// ADDITIONAL CONTRIBUTORS -// -// Ulf Winklemann: move-by-word in 1.1 -// Fabian Giesen: secondary key inputs in 1.5 -// Martins Mozeiko: STB_TEXTEDIT_memmove -// -// Bugfixes: -// Scott Graham -// Daniel Keller -// Omar Cornut -// -// USAGE -// -// This file behaves differently depending on what symbols you define -// before including it. -// -// -// Header-file mode: -// -// If you do not define STB_TEXTEDIT_IMPLEMENTATION before including this, -// it will operate in "header file" mode. In this mode, it declares a -// single public symbol, STB_TexteditState, which encapsulates the current -// state of a text widget (except for the string, which you will store -// separately). -// -// To compile in this mode, you must define STB_TEXTEDIT_CHARTYPE to a -// primitive type that defines a single character (e.g. char, wchar_t, etc). -// -// To save space or increase undo-ability, you can optionally define the -// following things that are used by the undo system: -// -// STB_TEXTEDIT_POSITIONTYPE small int type encoding a valid cursor position -// STB_TEXTEDIT_UNDOSTATECOUNT the number of undo states to allow -// STB_TEXTEDIT_UNDOCHARCOUNT the number of characters to store in the undo buffer -// -// If you don't define these, they are set to permissive types and -// moderate sizes. The undo system does no memory allocations, so -// it grows STB_TexteditState by the worst-case storage which is (in bytes): -// -// [4 + sizeof(STB_TEXTEDIT_POSITIONTYPE)] * STB_TEXTEDIT_UNDOSTATE_COUNT -// + sizeof(STB_TEXTEDIT_CHARTYPE) * STB_TEXTEDIT_UNDOCHAR_COUNT -// -// -// Implementation mode: -// -// If you define STB_TEXTEDIT_IMPLEMENTATION before including this, it -// will compile the implementation of the text edit widget, depending -// on a large number of symbols which must be defined before the include. -// -// The implementation is defined only as static functions. You will then -// need to provide your own APIs in the same file which will access the -// static functions. -// -// The basic concept is that you provide a "string" object which -// behaves like an array of characters. stb_textedit uses indices to -// refer to positions in the string, implicitly representing positions -// in the displayed textedit. This is true for both plain text and -// rich text; even with rich text stb_truetype interacts with your -// code as if there was an array of all the displayed characters. -// -// Symbols that must be the same in header-file and implementation mode: -// -// STB_TEXTEDIT_CHARTYPE the character type -// STB_TEXTEDIT_POSITIONTYPE small type that a valid cursor position -// STB_TEXTEDIT_UNDOSTATECOUNT the number of undo states to allow -// STB_TEXTEDIT_UNDOCHARCOUNT the number of characters to store in the undo buffer -// -// Symbols you must define for implementation mode: -// -// STB_TEXTEDIT_STRING the type of object representing a string being edited, -// typically this is a wrapper object with other data you need -// -// STB_TEXTEDIT_STRINGLEN(obj) the length of the string (ideally O(1)) -// STB_TEXTEDIT_LAYOUTROW(&r,obj,n) returns the results of laying out a line of characters -// starting from character #n (see discussion below) -// STB_TEXTEDIT_GETWIDTH(obj,n,i) returns the pixel delta from the xpos of the i'th character -// to the xpos of the i+1'th char for a line of characters -// starting at character #n (i.e. accounts for kerning -// with previous char) -// STB_TEXTEDIT_KEYTOTEXT(k) maps a keyboard input to an insertable character -// (return type is int, -1 means not valid to insert) -// STB_TEXTEDIT_GETCHAR(obj,i) returns the i'th character of obj, 0-based -// STB_TEXTEDIT_NEWLINE the character returned by _GETCHAR() we recognize -// as manually wordwrapping for end-of-line positioning -// -// STB_TEXTEDIT_DELETECHARS(obj,i,n) delete n characters starting at i -// STB_TEXTEDIT_INSERTCHARS(obj,i,c*,n) insert n characters at i (pointed to by STB_TEXTEDIT_CHARTYPE*) -// -// STB_TEXTEDIT_K_SHIFT a power of two that is or'd in to a keyboard input to represent the shift key -// -// STB_TEXTEDIT_K_LEFT keyboard input to move cursor left -// STB_TEXTEDIT_K_RIGHT keyboard input to move cursor right -// STB_TEXTEDIT_K_UP keyboard input to move cursor up -// STB_TEXTEDIT_K_DOWN keyboard input to move cursor down -// STB_TEXTEDIT_K_LINESTART keyboard input to move cursor to start of line // e.g. HOME -// STB_TEXTEDIT_K_LINEEND keyboard input to move cursor to end of line // e.g. END -// STB_TEXTEDIT_K_TEXTSTART keyboard input to move cursor to start of text // e.g. ctrl-HOME -// STB_TEXTEDIT_K_TEXTEND keyboard input to move cursor to end of text // e.g. ctrl-END -// STB_TEXTEDIT_K_DELETE keyboard input to delete selection or character under cursor -// STB_TEXTEDIT_K_BACKSPACE keyboard input to delete selection or character left of cursor -// STB_TEXTEDIT_K_UNDO keyboard input to perform undo -// STB_TEXTEDIT_K_REDO keyboard input to perform redo -// -// Optional: -// STB_TEXTEDIT_K_INSERT keyboard input to toggle insert mode -// STB_TEXTEDIT_IS_SPACE(ch) true if character is whitespace (e.g. 'isspace'), -// required for default WORDLEFT/WORDRIGHT handlers -// STB_TEXTEDIT_MOVEWORDLEFT(obj,i) custom handler for WORDLEFT, returns index to move cursor to -// STB_TEXTEDIT_MOVEWORDRIGHT(obj,i) custom handler for WORDRIGHT, returns index to move cursor to -// STB_TEXTEDIT_K_WORDLEFT keyboard input to move cursor left one word // e.g. ctrl-LEFT -// STB_TEXTEDIT_K_WORDRIGHT keyboard input to move cursor right one word // e.g. ctrl-RIGHT -// STB_TEXTEDIT_K_LINESTART2 secondary keyboard input to move cursor to start of line -// STB_TEXTEDIT_K_LINEEND2 secondary keyboard input to move cursor to end of line -// STB_TEXTEDIT_K_TEXTSTART2 secondary keyboard input to move cursor to start of text -// STB_TEXTEDIT_K_TEXTEND2 secondary keyboard input to move cursor to end of text -// -// Todo: -// STB_TEXTEDIT_K_PGUP keyboard input to move cursor up a page -// STB_TEXTEDIT_K_PGDOWN keyboard input to move cursor down a page -// -// Keyboard input must be encoded as a single integer value; e.g. a character code -// and some bitflags that represent shift states. to simplify the interface, SHIFT must -// be a bitflag, so we can test the shifted state of cursor movements to allow selection, -// i.e. (STB_TEXTED_K_RIGHT|STB_TEXTEDIT_K_SHIFT) should be shifted right-arrow. -// -// You can encode other things, such as CONTROL or ALT, in additional bits, and -// then test for their presence in e.g. STB_TEXTEDIT_K_WORDLEFT. For example, -// my Windows implementations add an additional CONTROL bit, and an additional KEYDOWN -// bit. Then all of the STB_TEXTEDIT_K_ values bitwise-or in the KEYDOWN bit, -// and I pass both WM_KEYDOWN and WM_CHAR events to the "key" function in the -// API below. The control keys will only match WM_KEYDOWN events because of the -// keydown bit I add, and STB_TEXTEDIT_KEYTOTEXT only tests for the KEYDOWN -// bit so it only decodes WM_CHAR events. -// -// STB_TEXTEDIT_LAYOUTROW returns information about the shape of one displayed -// row of characters assuming they start on the i'th character--the width and -// the height and the number of characters consumed. This allows this library -// to traverse the entire layout incrementally. You need to compute word-wrapping -// here. -// -// Each textfield keeps its own insert mode state, which is not how normal -// applications work. To keep an app-wide insert mode, update/copy the -// "insert_mode" field of STB_TexteditState before/after calling API functions. -// -// API -// -// void stb_textedit_initialize_state(STB_TexteditState *state, int is_single_line) -// -// void stb_textedit_click(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, float x, float y) -// void stb_textedit_drag(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, float x, float y) -// int stb_textedit_cut(STB_TEXTEDIT_STRING *str, STB_TexteditState *state) -// int stb_textedit_paste(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, STB_TEXTEDIT_CHARTYPE *text, int len) -// void stb_textedit_key(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, int key) -// -// Each of these functions potentially updates the string and updates the -// state. -// -// initialize_state: -// set the textedit state to a known good default state when initially -// constructing the textedit. -// -// click: -// call this with the mouse x,y on a mouse down; it will update the cursor -// and reset the selection start/end to the cursor point. the x,y must -// be relative to the text widget, with (0,0) being the top left. -// -// drag: -// call this with the mouse x,y on a mouse drag/up; it will update the -// cursor and the selection end point -// -// cut: -// call this to delete the current selection; returns true if there was -// one. you should FIRST copy the current selection to the system paste buffer. -// (To copy, just copy the current selection out of the string yourself.) -// -// paste: -// call this to paste text at the current cursor point or over the current -// selection if there is one. -// -// key: -// call this for keyboard inputs sent to the textfield. you can use it -// for "key down" events or for "translated" key events. if you need to -// do both (as in Win32), or distinguish Unicode characters from control -// inputs, set a high bit to distinguish the two; then you can define the -// various definitions like STB_TEXTEDIT_K_LEFT have the is-key-event bit -// set, and make STB_TEXTEDIT_KEYTOCHAR check that the is-key-event bit is -// clear. -// -// When rendering, you can read the cursor position and selection state from -// the STB_TexteditState. -// -// -// Notes: -// -// This is designed to be usable in IMGUI, so it allows for the possibility of -// running in an IMGUI that has NOT cached the multi-line layout. For this -// reason, it provides an interface that is compatible with computing the -// layout incrementally--we try to make sure we make as few passes through -// as possible. (For example, to locate the mouse pointer in the text, we -// could define functions that return the X and Y positions of characters -// and binary search Y and then X, but if we're doing dynamic layout this -// will run the layout algorithm many times, so instead we manually search -// forward in one pass. Similar logic applies to e.g. up-arrow and -// down-arrow movement.) -// -// If it's run in a widget that *has* cached the layout, then this is less -// efficient, but it's not horrible on modern computers. But you wouldn't -// want to edit million-line files with it. - - -//////////////////////////////////////////////////////////////////////////// -//////////////////////////////////////////////////////////////////////////// -//// -//// Header-file mode -//// -//// - -#ifndef INCLUDE_STB_TEXTEDIT_H -#define INCLUDE_STB_TEXTEDIT_H - -//////////////////////////////////////////////////////////////////////// -// -// STB_TexteditState -// -// Definition of STB_TexteditState which you should store -// per-textfield; it includes cursor position, selection state, -// and undo state. -// - -#ifndef STB_TEXTEDIT_UNDOSTATECOUNT -#define STB_TEXTEDIT_UNDOSTATECOUNT 99 -#endif -#ifndef STB_TEXTEDIT_UNDOCHARCOUNT -#define STB_TEXTEDIT_UNDOCHARCOUNT 999 -#endif -#ifndef STB_TEXTEDIT_CHARTYPE -#define STB_TEXTEDIT_CHARTYPE int -#endif -#ifndef STB_TEXTEDIT_POSITIONTYPE -#define STB_TEXTEDIT_POSITIONTYPE int -#endif - -typedef struct -{ - // private data - STB_TEXTEDIT_POSITIONTYPE where; - short insert_length; - short delete_length; - short char_storage; -} StbUndoRecord; - -typedef struct -{ - // private data - StbUndoRecord undo_rec [STB_TEXTEDIT_UNDOSTATECOUNT]; - STB_TEXTEDIT_CHARTYPE undo_char[STB_TEXTEDIT_UNDOCHARCOUNT]; - short undo_point, redo_point; - short undo_char_point, redo_char_point; -} StbUndoState; - -typedef struct -{ - ///////////////////// - // - // public data - // - - int cursor; - // position of the text cursor within the string - - int select_start; // selection start point - int select_end; - // selection start and end point in characters; if equal, no selection. - // note that start may be less than or greater than end (e.g. when - // dragging the mouse, start is where the initial click was, and you - // can drag in either direction) - - unsigned char insert_mode; - // each textfield keeps its own insert mode state. to keep an app-wide - // insert mode, copy this value in/out of the app state - - ///////////////////// - // - // private data - // - unsigned char cursor_at_end_of_line; // not implemented yet - unsigned char initialized; - unsigned char has_preferred_x; - unsigned char single_line; - unsigned char padding1, padding2, padding3; - float preferred_x; // this determines where the cursor up/down tries to seek to along x - StbUndoState undostate; -} STB_TexteditState; - - -//////////////////////////////////////////////////////////////////////// -// -// StbTexteditRow -// -// Result of layout query, used by stb_textedit to determine where -// the text in each row is. - -// result of layout query -typedef struct -{ - float x0,x1; // starting x location, end x location (allows for align=right, etc) - float baseline_y_delta; // position of baseline relative to previous row's baseline - float ymin,ymax; // height of row above and below baseline - int num_chars; -} StbTexteditRow; -#endif //INCLUDE_STB_TEXTEDIT_H - - -//////////////////////////////////////////////////////////////////////////// -//////////////////////////////////////////////////////////////////////////// -//// -//// Implementation mode -//// -//// - - -// implementation isn't include-guarded, since it might have indirectly -// included just the "header" portion -#ifdef STB_TEXTEDIT_IMPLEMENTATION - -#ifndef STB_TEXTEDIT_memmove -#include <string.h> -#define STB_TEXTEDIT_memmove memmove -#endif - - -///////////////////////////////////////////////////////////////////////////// -// -// Mouse input handling -// - -// traverse the layout to locate the nearest character to a display position -static int stb_text_locate_coord(STB_TEXTEDIT_STRING *str, float x, float y) -{ - StbTexteditRow r; - int n = STB_TEXTEDIT_STRINGLEN(str); - float base_y = 0, prev_x; - int i=0, k; - - r.x0 = r.x1 = 0; - r.ymin = r.ymax = 0; - r.num_chars = 0; - - // search rows to find one that straddles 'y' - while (i < n) { - STB_TEXTEDIT_LAYOUTROW(&r, str, i); - if (r.num_chars <= 0) - return n; - - if (i==0 && y < base_y + r.ymin) - return 0; - - if (y < base_y + r.ymax) - break; - - i += r.num_chars; - base_y += r.baseline_y_delta; - } - - // below all text, return 'after' last character - if (i >= n) - return n; - - // check if it's before the beginning of the line - if (x < r.x0) - return i; - - // check if it's before the end of the line - if (x < r.x1) { - // search characters in row for one that straddles 'x' - prev_x = r.x0; - for (k=0; k < r.num_chars; ++k) { - float w = STB_TEXTEDIT_GETWIDTH(str, i, k); - if (x < prev_x+w) { - if (x < prev_x+w/2) - return k+i; - else - return k+i+1; - } - prev_x += w; - } - // shouldn't happen, but if it does, fall through to end-of-line case - } - - // if the last character is a newline, return that. otherwise return 'after' the last character - if (STB_TEXTEDIT_GETCHAR(str, i+r.num_chars-1) == STB_TEXTEDIT_NEWLINE) - return i+r.num_chars-1; - else - return i+r.num_chars; -} - -// API click: on mouse down, move the cursor to the clicked location, and reset the selection -static void stb_textedit_click(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, float x, float y) -{ - state->cursor = stb_text_locate_coord(str, x, y); - state->select_start = state->cursor; - state->select_end = state->cursor; - state->has_preferred_x = 0; -} - -// API drag: on mouse drag, move the cursor and selection endpoint to the clicked location -static void stb_textedit_drag(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, float x, float y) -{ - int p = stb_text_locate_coord(str, x, y); - if (state->select_start == state->select_end) - state->select_start = state->cursor; - state->cursor = state->select_end = p; -} - -///////////////////////////////////////////////////////////////////////////// -// -// Keyboard input handling -// - -// forward declarations -static void stb_text_undo(STB_TEXTEDIT_STRING *str, STB_TexteditState *state); -static void stb_text_redo(STB_TEXTEDIT_STRING *str, STB_TexteditState *state); -static void stb_text_makeundo_delete(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, int where, int length); -static void stb_text_makeundo_insert(STB_TexteditState *state, int where, int length); -static void stb_text_makeundo_replace(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, int where, int old_length, int new_length); - -typedef struct -{ - float x,y; // position of n'th character - float height; // height of line - int first_char, length; // first char of row, and length - int prev_first; // first char of previous row -} StbFindState; - -// find the x/y location of a character, and remember info about the previous row in -// case we get a move-up event (for page up, we'll have to rescan) -static void stb_textedit_find_charpos(StbFindState *find, STB_TEXTEDIT_STRING *str, int n, int single_line) -{ - StbTexteditRow r; - int prev_start = 0; - int z = STB_TEXTEDIT_STRINGLEN(str); - int i=0, first; - - if (n == z) { - // if it's at the end, then find the last line -- simpler than trying to - // explicitly handle this case in the regular code - if (single_line) { - STB_TEXTEDIT_LAYOUTROW(&r, str, 0); - find->y = 0; - find->first_char = 0; - find->length = z; - find->height = r.ymax - r.ymin; - find->x = r.x1; - } else { - find->y = 0; - find->x = 0; - find->height = 1; - while (i < z) { - STB_TEXTEDIT_LAYOUTROW(&r, str, i); - prev_start = i; - i += r.num_chars; - } - find->first_char = i; - find->length = 0; - find->prev_first = prev_start; - } - return; - } - - // search rows to find the one that straddles character n - find->y = 0; - - for(;;) { - STB_TEXTEDIT_LAYOUTROW(&r, str, i); - if (n < i + r.num_chars) - break; - prev_start = i; - i += r.num_chars; - find->y += r.baseline_y_delta; - } - - find->first_char = first = i; - find->length = r.num_chars; - find->height = r.ymax - r.ymin; - find->prev_first = prev_start; - - // now scan to find xpos - find->x = r.x0; - i = 0; - for (i=0; first+i < n; ++i) - find->x += STB_TEXTEDIT_GETWIDTH(str, first, i); -} - -#define STB_TEXT_HAS_SELECTION(s) ((s)->select_start != (s)->select_end) - -// make the selection/cursor state valid if client altered the string -static void stb_textedit_clamp(STB_TEXTEDIT_STRING *str, STB_TexteditState *state) -{ - int n = STB_TEXTEDIT_STRINGLEN(str); - if (STB_TEXT_HAS_SELECTION(state)) { - if (state->select_start > n) state->select_start = n; - if (state->select_end > n) state->select_end = n; - // if clamping forced them to be equal, move the cursor to match - if (state->select_start == state->select_end) - state->cursor = state->select_start; - } - if (state->cursor > n) state->cursor = n; -} - -// delete characters while updating undo -static void stb_textedit_delete(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, int where, int len) -{ - stb_text_makeundo_delete(str, state, where, len); - STB_TEXTEDIT_DELETECHARS(str, where, len); - state->has_preferred_x = 0; -} - -// delete the section -static void stb_textedit_delete_selection(STB_TEXTEDIT_STRING *str, STB_TexteditState *state) -{ - stb_textedit_clamp(str, state); - if (STB_TEXT_HAS_SELECTION(state)) { - if (state->select_start < state->select_end) { - stb_textedit_delete(str, state, state->select_start, state->select_end - state->select_start); - state->select_end = state->cursor = state->select_start; - } else { - stb_textedit_delete(str, state, state->select_end, state->select_start - state->select_end); - state->select_start = state->cursor = state->select_end; - } - state->has_preferred_x = 0; - } -} - -// canoncialize the selection so start <= end -static void stb_textedit_sortselection(STB_TexteditState *state) -{ - if (state->select_end < state->select_start) { - int temp = state->select_end; - state->select_end = state->select_start; - state->select_start = temp; - } -} - -// move cursor to first character of selection -static void stb_textedit_move_to_first(STB_TexteditState *state) -{ - if (STB_TEXT_HAS_SELECTION(state)) { - stb_textedit_sortselection(state); - state->cursor = state->select_start; - state->select_end = state->select_start; - state->has_preferred_x = 0; - } -} - -// move cursor to last character of selection -static void stb_textedit_move_to_last(STB_TEXTEDIT_STRING *str, STB_TexteditState *state) -{ - if (STB_TEXT_HAS_SELECTION(state)) { - stb_textedit_sortselection(state); - stb_textedit_clamp(str, state); - state->cursor = state->select_end; - state->select_start = state->select_end; - state->has_preferred_x = 0; - } -} - -#ifdef STB_TEXTEDIT_IS_SPACE -static int is_word_boundary( STB_TEXTEDIT_STRING *str, int idx ) -{ - return idx > 0 ? (STB_TEXTEDIT_IS_SPACE( STB_TEXTEDIT_GETCHAR(str,idx-1) ) && !STB_TEXTEDIT_IS_SPACE( STB_TEXTEDIT_GETCHAR(str, idx) ) ) : 1; -} - -#ifndef STB_TEXTEDIT_MOVEWORDLEFT -static int stb_textedit_move_to_word_previous( STB_TEXTEDIT_STRING *str, int c ) -{ - --c; // always move at least one character - while( c >= 0 && !is_word_boundary( str, c ) ) - --c; - - if( c < 0 ) - c = 0; - - return c; -} -#define STB_TEXTEDIT_MOVEWORDLEFT stb_textedit_move_to_word_previous -#endif - -#ifndef STB_TEXTEDIT_MOVEWORDRIGHT -static int stb_textedit_move_to_word_next( STB_TEXTEDIT_STRING *str, int c ) -{ - const int len = STB_TEXTEDIT_STRINGLEN(str); - ++c; // always move at least one character - while( c < len && !is_word_boundary( str, c ) ) - ++c; - - if( c > len ) - c = len; - - return c; -} -#define STB_TEXTEDIT_MOVEWORDRIGHT stb_textedit_move_to_word_next -#endif - -#endif - -// update selection and cursor to match each other -static void stb_textedit_prep_selection_at_cursor(STB_TexteditState *state) -{ - if (!STB_TEXT_HAS_SELECTION(state)) - state->select_start = state->select_end = state->cursor; - else - state->cursor = state->select_end; -} - -// API cut: delete selection -static int stb_textedit_cut(STB_TEXTEDIT_STRING *str, STB_TexteditState *state) -{ - if (STB_TEXT_HAS_SELECTION(state)) { - stb_textedit_delete_selection(str,state); // implicity clamps - state->has_preferred_x = 0; - return 1; - } - return 0; -} - -// API paste: replace existing selection with passed-in text -static int stb_textedit_paste(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, STB_TEXTEDIT_CHARTYPE const *ctext, int len) -{ - STB_TEXTEDIT_CHARTYPE *text = (STB_TEXTEDIT_CHARTYPE *) ctext; - // if there's a selection, the paste should delete it - stb_textedit_clamp(str, state); - stb_textedit_delete_selection(str,state); - // try to insert the characters - if (STB_TEXTEDIT_INSERTCHARS(str, state->cursor, text, len)) { - stb_text_makeundo_insert(state, state->cursor, len); - state->cursor += len; - state->has_preferred_x = 0; - return 1; - } - // remove the undo since we didn't actually insert the characters - if (state->undostate.undo_point) - --state->undostate.undo_point; - return 0; -} - -// API key: process a keyboard input -static void stb_textedit_key(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, int key) -{ -retry: - switch (key) { - default: { - int c = STB_TEXTEDIT_KEYTOTEXT(key); - if (c > 0) { - STB_TEXTEDIT_CHARTYPE ch = (STB_TEXTEDIT_CHARTYPE) c; - - // can't add newline in single-line mode - if (c == '\n' && state->single_line) - break; - - if (state->insert_mode && !STB_TEXT_HAS_SELECTION(state) && state->cursor < STB_TEXTEDIT_STRINGLEN(str)) { - stb_text_makeundo_replace(str, state, state->cursor, 1, 1); - STB_TEXTEDIT_DELETECHARS(str, state->cursor, 1); - if (STB_TEXTEDIT_INSERTCHARS(str, state->cursor, &ch, 1)) { - ++state->cursor; - state->has_preferred_x = 0; - } - } else { - stb_textedit_delete_selection(str,state); // implicity clamps - if (STB_TEXTEDIT_INSERTCHARS(str, state->cursor, &ch, 1)) { - stb_text_makeundo_insert(state, state->cursor, 1); - ++state->cursor; - state->has_preferred_x = 0; - } - } - } - break; - } - -#ifdef STB_TEXTEDIT_K_INSERT - case STB_TEXTEDIT_K_INSERT: - state->insert_mode = !state->insert_mode; - break; -#endif - - case STB_TEXTEDIT_K_UNDO: - stb_text_undo(str, state); - state->has_preferred_x = 0; - break; - - case STB_TEXTEDIT_K_REDO: - stb_text_redo(str, state); - state->has_preferred_x = 0; - break; - - case STB_TEXTEDIT_K_LEFT: - // if currently there's a selection, move cursor to start of selection - if (STB_TEXT_HAS_SELECTION(state)) - stb_textedit_move_to_first(state); - else - if (state->cursor > 0) - --state->cursor; - state->has_preferred_x = 0; - break; - - case STB_TEXTEDIT_K_RIGHT: - // if currently there's a selection, move cursor to end of selection - if (STB_TEXT_HAS_SELECTION(state)) - stb_textedit_move_to_last(str, state); - else - ++state->cursor; - stb_textedit_clamp(str, state); - state->has_preferred_x = 0; - break; - - case STB_TEXTEDIT_K_LEFT | STB_TEXTEDIT_K_SHIFT: - stb_textedit_clamp(str, state); - stb_textedit_prep_selection_at_cursor(state); - // move selection left - if (state->select_end > 0) - --state->select_end; - state->cursor = state->select_end; - state->has_preferred_x = 0; - break; - -#ifdef STB_TEXTEDIT_MOVEWORDLEFT - case STB_TEXTEDIT_K_WORDLEFT: - if (STB_TEXT_HAS_SELECTION(state)) - stb_textedit_move_to_first(state); - else { - state->cursor = STB_TEXTEDIT_MOVEWORDLEFT(str, state->cursor); - stb_textedit_clamp( str, state ); - } - break; - - case STB_TEXTEDIT_K_WORDLEFT | STB_TEXTEDIT_K_SHIFT: - if( !STB_TEXT_HAS_SELECTION( state ) ) - stb_textedit_prep_selection_at_cursor(state); - - state->cursor = STB_TEXTEDIT_MOVEWORDLEFT(str, state->cursor); - state->select_end = state->cursor; - - stb_textedit_clamp( str, state ); - break; -#endif - -#ifdef STB_TEXTEDIT_MOVEWORDRIGHT - case STB_TEXTEDIT_K_WORDRIGHT: - if (STB_TEXT_HAS_SELECTION(state)) - stb_textedit_move_to_last(str, state); - else { - state->cursor = STB_TEXTEDIT_MOVEWORDRIGHT(str, state->cursor); - stb_textedit_clamp( str, state ); - } - break; - - case STB_TEXTEDIT_K_WORDRIGHT | STB_TEXTEDIT_K_SHIFT: - if( !STB_TEXT_HAS_SELECTION( state ) ) - stb_textedit_prep_selection_at_cursor(state); - - state->cursor = STB_TEXTEDIT_MOVEWORDRIGHT(str, state->cursor); - state->select_end = state->cursor; - - stb_textedit_clamp( str, state ); - break; -#endif - - case STB_TEXTEDIT_K_RIGHT | STB_TEXTEDIT_K_SHIFT: - stb_textedit_prep_selection_at_cursor(state); - // move selection right - ++state->select_end; - stb_textedit_clamp(str, state); - state->cursor = state->select_end; - state->has_preferred_x = 0; - break; - - case STB_TEXTEDIT_K_DOWN: - case STB_TEXTEDIT_K_DOWN | STB_TEXTEDIT_K_SHIFT: { - StbFindState find; - StbTexteditRow row; - int i, sel = (key & STB_TEXTEDIT_K_SHIFT) != 0; - - if (state->single_line) { - // on windows, up&down in single-line behave like left&right - key = STB_TEXTEDIT_K_RIGHT | (key & STB_TEXTEDIT_K_SHIFT); - goto retry; - } - - if (sel) - stb_textedit_prep_selection_at_cursor(state); - else if (STB_TEXT_HAS_SELECTION(state)) - stb_textedit_move_to_last(str,state); - - // compute current position of cursor point - stb_textedit_clamp(str, state); - stb_textedit_find_charpos(&find, str, state->cursor, state->single_line); - - // now find character position down a row - if (find.length) { - float goal_x = state->has_preferred_x ? state->preferred_x : find.x; - float x; - int start = find.first_char + find.length; - state->cursor = start; - STB_TEXTEDIT_LAYOUTROW(&row, str, state->cursor); - x = row.x0; - for (i=0; i < row.num_chars; ++i) { - float dx = STB_TEXTEDIT_GETWIDTH(str, start, i); - #ifdef STB_TEXTEDIT_GETWIDTH_NEWLINE - if (dx == STB_TEXTEDIT_GETWIDTH_NEWLINE) - break; - #endif - x += dx; - if (x > goal_x) - break; - ++state->cursor; - } - stb_textedit_clamp(str, state); - - state->has_preferred_x = 1; - state->preferred_x = goal_x; - - if (sel) - state->select_end = state->cursor; - } - break; - } - - case STB_TEXTEDIT_K_UP: - case STB_TEXTEDIT_K_UP | STB_TEXTEDIT_K_SHIFT: { - StbFindState find; - StbTexteditRow row; - int i, sel = (key & STB_TEXTEDIT_K_SHIFT) != 0; - - if (state->single_line) { - // on windows, up&down become left&right - key = STB_TEXTEDIT_K_LEFT | (key & STB_TEXTEDIT_K_SHIFT); - goto retry; - } - - if (sel) - stb_textedit_prep_selection_at_cursor(state); - else if (STB_TEXT_HAS_SELECTION(state)) - stb_textedit_move_to_first(state); - - // compute current position of cursor point - stb_textedit_clamp(str, state); - stb_textedit_find_charpos(&find, str, state->cursor, state->single_line); - - // can only go up if there's a previous row - if (find.prev_first != find.first_char) { - // now find character position up a row - float goal_x = state->has_preferred_x ? state->preferred_x : find.x; - float x; - state->cursor = find.prev_first; - STB_TEXTEDIT_LAYOUTROW(&row, str, state->cursor); - x = row.x0; - for (i=0; i < row.num_chars; ++i) { - float dx = STB_TEXTEDIT_GETWIDTH(str, find.prev_first, i); - #ifdef STB_TEXTEDIT_GETWIDTH_NEWLINE - if (dx == STB_TEXTEDIT_GETWIDTH_NEWLINE) - break; - #endif - x += dx; - if (x > goal_x) - break; - ++state->cursor; - } - stb_textedit_clamp(str, state); - - state->has_preferred_x = 1; - state->preferred_x = goal_x; - - if (sel) - state->select_end = state->cursor; - } - break; - } - - case STB_TEXTEDIT_K_DELETE: - case STB_TEXTEDIT_K_DELETE | STB_TEXTEDIT_K_SHIFT: - if (STB_TEXT_HAS_SELECTION(state)) - stb_textedit_delete_selection(str, state); - else { - int n = STB_TEXTEDIT_STRINGLEN(str); - if (state->cursor < n) - stb_textedit_delete(str, state, state->cursor, 1); - } - state->has_preferred_x = 0; - break; - - case STB_TEXTEDIT_K_BACKSPACE: - case STB_TEXTEDIT_K_BACKSPACE | STB_TEXTEDIT_K_SHIFT: - if (STB_TEXT_HAS_SELECTION(state)) - stb_textedit_delete_selection(str, state); - else { - stb_textedit_clamp(str, state); - if (state->cursor > 0) { - stb_textedit_delete(str, state, state->cursor-1, 1); - --state->cursor; - } - } - state->has_preferred_x = 0; - break; - -#ifdef STB_TEXTEDIT_K_TEXTSTART2 - case STB_TEXTEDIT_K_TEXTSTART2: -#endif - case STB_TEXTEDIT_K_TEXTSTART: - state->cursor = state->select_start = state->select_end = 0; - state->has_preferred_x = 0; - break; - -#ifdef STB_TEXTEDIT_K_TEXTEND2 - case STB_TEXTEDIT_K_TEXTEND2: -#endif - case STB_TEXTEDIT_K_TEXTEND: - state->cursor = STB_TEXTEDIT_STRINGLEN(str); - state->select_start = state->select_end = 0; - state->has_preferred_x = 0; - break; - -#ifdef STB_TEXTEDIT_K_TEXTSTART2 - case STB_TEXTEDIT_K_TEXTSTART2 | STB_TEXTEDIT_K_SHIFT: -#endif - case STB_TEXTEDIT_K_TEXTSTART | STB_TEXTEDIT_K_SHIFT: - stb_textedit_prep_selection_at_cursor(state); - state->cursor = state->select_end = 0; - state->has_preferred_x = 0; - break; - -#ifdef STB_TEXTEDIT_K_TEXTEND2 - case STB_TEXTEDIT_K_TEXTEND2 | STB_TEXTEDIT_K_SHIFT: -#endif - case STB_TEXTEDIT_K_TEXTEND | STB_TEXTEDIT_K_SHIFT: - stb_textedit_prep_selection_at_cursor(state); - state->cursor = state->select_end = STB_TEXTEDIT_STRINGLEN(str); - state->has_preferred_x = 0; - break; - - -#ifdef STB_TEXTEDIT_K_LINESTART2 - case STB_TEXTEDIT_K_LINESTART2: -#endif - case STB_TEXTEDIT_K_LINESTART: - stb_textedit_clamp(str, state); - stb_textedit_move_to_first(state); - if (state->single_line) - state->cursor = 0; - else while (state->cursor > 0 && STB_TEXTEDIT_GETCHAR(str, state->cursor-1) != STB_TEXTEDIT_NEWLINE) - --state->cursor; - state->has_preferred_x = 0; - break; - -#ifdef STB_TEXTEDIT_K_LINEEND2 - case STB_TEXTEDIT_K_LINEEND2: -#endif - case STB_TEXTEDIT_K_LINEEND: { - int n = STB_TEXTEDIT_STRINGLEN(str); - stb_textedit_clamp(str, state); - stb_textedit_move_to_first(state); - if (state->single_line) - state->cursor = n; - else while (state->cursor < n && STB_TEXTEDIT_GETCHAR(str, state->cursor) != STB_TEXTEDIT_NEWLINE) - ++state->cursor; - state->has_preferred_x = 0; - break; - } - -#ifdef STB_TEXTEDIT_K_LINESTART2 - case STB_TEXTEDIT_K_LINESTART2 | STB_TEXTEDIT_K_SHIFT: -#endif - case STB_TEXTEDIT_K_LINESTART | STB_TEXTEDIT_K_SHIFT: - stb_textedit_clamp(str, state); - stb_textedit_prep_selection_at_cursor(state); - if (state->single_line) - state->cursor = 0; - else while (state->cursor > 0 && STB_TEXTEDIT_GETCHAR(str, state->cursor-1) != STB_TEXTEDIT_NEWLINE) - --state->cursor; - state->select_end = state->cursor; - state->has_preferred_x = 0; - break; - -#ifdef STB_TEXTEDIT_K_LINEEND2 - case STB_TEXTEDIT_K_LINEEND2 | STB_TEXTEDIT_K_SHIFT: -#endif - case STB_TEXTEDIT_K_LINEEND | STB_TEXTEDIT_K_SHIFT: { - int n = STB_TEXTEDIT_STRINGLEN(str); - stb_textedit_clamp(str, state); - stb_textedit_prep_selection_at_cursor(state); - if (state->single_line) - state->cursor = n; - else while (state->cursor < n && STB_TEXTEDIT_GETCHAR(str, state->cursor) != STB_TEXTEDIT_NEWLINE) - ++state->cursor; - state->select_end = state->cursor; - state->has_preferred_x = 0; - break; - } - -// @TODO: -// STB_TEXTEDIT_K_PGUP - move cursor up a page -// STB_TEXTEDIT_K_PGDOWN - move cursor down a page - } -} - -///////////////////////////////////////////////////////////////////////////// -// -// Undo processing -// -// @OPTIMIZE: the undo/redo buffer should be circular - -static void stb_textedit_flush_redo(StbUndoState *state) -{ - state->redo_point = STB_TEXTEDIT_UNDOSTATECOUNT; - state->redo_char_point = STB_TEXTEDIT_UNDOCHARCOUNT; -} - -// discard the oldest entry in the undo list -static void stb_textedit_discard_undo(StbUndoState *state) -{ - if (state->undo_point > 0) { - // if the 0th undo state has characters, clean those up - if (state->undo_rec[0].char_storage >= 0) { - int n = state->undo_rec[0].insert_length, i; - // delete n characters from all other records - state->undo_char_point = state->undo_char_point - (short) n; // vsnet05 - STB_TEXTEDIT_memmove(state->undo_char, state->undo_char + n, (size_t) ((size_t)state->undo_char_point*sizeof(STB_TEXTEDIT_CHARTYPE))); - for (i=0; i < state->undo_point; ++i) - if (state->undo_rec[i].char_storage >= 0) - state->undo_rec[i].char_storage = state->undo_rec[i].char_storage - (short) n; // vsnet05 // @OPTIMIZE: get rid of char_storage and infer it - } - --state->undo_point; - STB_TEXTEDIT_memmove(state->undo_rec, state->undo_rec+1, (size_t) ((size_t)state->undo_point*sizeof(state->undo_rec[0]))); - } -} - -// discard the oldest entry in the redo list--it's bad if this -// ever happens, but because undo & redo have to store the actual -// characters in different cases, the redo character buffer can -// fill up even though the undo buffer didn't -static void stb_textedit_discard_redo(StbUndoState *state) -{ - int k = STB_TEXTEDIT_UNDOSTATECOUNT-1; - - if (state->redo_point <= k) { - // if the k'th undo state has characters, clean those up - if (state->undo_rec[k].char_storage >= 0) { - int n = state->undo_rec[k].insert_length, i; - // delete n characters from all other records - state->redo_char_point = state->redo_char_point + (short) n; // vsnet05 - STB_TEXTEDIT_memmove(state->undo_char + state->redo_char_point, state->undo_char + state->redo_char_point-n, (size_t) ((size_t)(STB_TEXTEDIT_UNDOCHARCOUNT - state->redo_char_point)*sizeof(STB_TEXTEDIT_CHARTYPE))); - for (i=state->redo_point; i < k; ++i) - if (state->undo_rec[i].char_storage >= 0) - state->undo_rec[i].char_storage = state->undo_rec[i].char_storage + (short) n; // vsnet05 - } - STB_TEXTEDIT_memmove(state->undo_rec + state->redo_point, state->undo_rec + state->redo_point-1, (size_t) ((size_t)(STB_TEXTEDIT_UNDOSTATECOUNT - state->redo_point)*sizeof(state->undo_rec[0]))); - ++state->redo_point; - } -} - -static StbUndoRecord *stb_text_create_undo_record(StbUndoState *state, int numchars) -{ - // any time we create a new undo record, we discard redo - stb_textedit_flush_redo(state); - - // if we have no free records, we have to make room, by sliding the - // existing records down - if (state->undo_point == STB_TEXTEDIT_UNDOSTATECOUNT) - stb_textedit_discard_undo(state); - - // if the characters to store won't possibly fit in the buffer, we can't undo - if (numchars > STB_TEXTEDIT_UNDOCHARCOUNT) { - state->undo_point = 0; - state->undo_char_point = 0; - return NULL; - } - - // if we don't have enough free characters in the buffer, we have to make room - while (state->undo_char_point + numchars > STB_TEXTEDIT_UNDOCHARCOUNT) - stb_textedit_discard_undo(state); - - return &state->undo_rec[state->undo_point++]; -} - -static STB_TEXTEDIT_CHARTYPE *stb_text_createundo(StbUndoState *state, int pos, int insert_len, int delete_len) -{ - StbUndoRecord *r = stb_text_create_undo_record(state, insert_len); - if (r == NULL) - return NULL; - - r->where = pos; - r->insert_length = (short) insert_len; - r->delete_length = (short) delete_len; - - if (insert_len == 0) { - r->char_storage = -1; - return NULL; - } else { - r->char_storage = state->undo_char_point; - state->undo_char_point = state->undo_char_point + (short) insert_len; - return &state->undo_char[r->char_storage]; - } -} - -static void stb_text_undo(STB_TEXTEDIT_STRING *str, STB_TexteditState *state) -{ - StbUndoState *s = &state->undostate; - StbUndoRecord u, *r; - if (s->undo_point == 0) - return; - - // we need to do two things: apply the undo record, and create a redo record - u = s->undo_rec[s->undo_point-1]; - r = &s->undo_rec[s->redo_point-1]; - r->char_storage = -1; - - r->insert_length = u.delete_length; - r->delete_length = u.insert_length; - r->where = u.where; - - if (u.delete_length) { - // if the undo record says to delete characters, then the redo record will - // need to re-insert the characters that get deleted, so we need to store - // them. - - // there are three cases: - // there's enough room to store the characters - // characters stored for *redoing* don't leave room for redo - // characters stored for *undoing* don't leave room for redo - // if the last is true, we have to bail - - if (s->undo_char_point + u.delete_length >= STB_TEXTEDIT_UNDOCHARCOUNT) { - // the undo records take up too much character space; there's no space to store the redo characters - r->insert_length = 0; - } else { - int i; - - // there's definitely room to store the characters eventually - while (s->undo_char_point + u.delete_length > s->redo_char_point) { - // there's currently not enough room, so discard a redo record - stb_textedit_discard_redo(s); - // should never happen: - if (s->redo_point == STB_TEXTEDIT_UNDOSTATECOUNT) - return; - } - r = &s->undo_rec[s->redo_point-1]; - - r->char_storage = s->redo_char_point - u.delete_length; - s->redo_char_point = s->redo_char_point - (short) u.delete_length; - - // now save the characters - for (i=0; i < u.delete_length; ++i) - s->undo_char[r->char_storage + i] = STB_TEXTEDIT_GETCHAR(str, u.where + i); - } - - // now we can carry out the deletion - STB_TEXTEDIT_DELETECHARS(str, u.where, u.delete_length); - } - - // check type of recorded action: - if (u.insert_length) { - // easy case: was a deletion, so we need to insert n characters - STB_TEXTEDIT_INSERTCHARS(str, u.where, &s->undo_char[u.char_storage], u.insert_length); - s->undo_char_point -= u.insert_length; - } - - state->cursor = u.where + u.insert_length; - - s->undo_point--; - s->redo_point--; -} - -static void stb_text_redo(STB_TEXTEDIT_STRING *str, STB_TexteditState *state) -{ - StbUndoState *s = &state->undostate; - StbUndoRecord *u, r; - if (s->redo_point == STB_TEXTEDIT_UNDOSTATECOUNT) - return; - - // we need to do two things: apply the redo record, and create an undo record - u = &s->undo_rec[s->undo_point]; - r = s->undo_rec[s->redo_point]; - - // we KNOW there must be room for the undo record, because the redo record - // was derived from an undo record - - u->delete_length = r.insert_length; - u->insert_length = r.delete_length; - u->where = r.where; - u->char_storage = -1; - - if (r.delete_length) { - // the redo record requires us to delete characters, so the undo record - // needs to store the characters - - if (s->undo_char_point + u->insert_length > s->redo_char_point) { - u->insert_length = 0; - u->delete_length = 0; - } else { - int i; - u->char_storage = s->undo_char_point; - s->undo_char_point = s->undo_char_point + u->insert_length; - - // now save the characters - for (i=0; i < u->insert_length; ++i) - s->undo_char[u->char_storage + i] = STB_TEXTEDIT_GETCHAR(str, u->where + i); - } - - STB_TEXTEDIT_DELETECHARS(str, r.where, r.delete_length); - } - - if (r.insert_length) { - // easy case: need to insert n characters - STB_TEXTEDIT_INSERTCHARS(str, r.where, &s->undo_char[r.char_storage], r.insert_length); - s->redo_char_point += r.insert_length; - } - - state->cursor = r.where + r.insert_length; - - s->undo_point++; - s->redo_point++; -} - -static void stb_text_makeundo_insert(STB_TexteditState *state, int where, int length) -{ - stb_text_createundo(&state->undostate, where, 0, length); -} - -static void stb_text_makeundo_delete(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, int where, int length) -{ - int i; - STB_TEXTEDIT_CHARTYPE *p = stb_text_createundo(&state->undostate, where, length, 0); - if (p) { - for (i=0; i < length; ++i) - p[i] = STB_TEXTEDIT_GETCHAR(str, where+i); - } -} - -static void stb_text_makeundo_replace(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, int where, int old_length, int new_length) -{ - int i; - STB_TEXTEDIT_CHARTYPE *p = stb_text_createundo(&state->undostate, where, old_length, new_length); - if (p) { - for (i=0; i < old_length; ++i) - p[i] = STB_TEXTEDIT_GETCHAR(str, where+i); - } -} - -// reset the state to default -static void stb_textedit_clear_state(STB_TexteditState *state, int is_single_line) -{ - state->undostate.undo_point = 0; - state->undostate.undo_char_point = 0; - state->undostate.redo_point = STB_TEXTEDIT_UNDOSTATECOUNT; - state->undostate.redo_char_point = STB_TEXTEDIT_UNDOCHARCOUNT; - state->select_end = state->select_start = 0; - state->cursor = 0; - state->has_preferred_x = 0; - state->preferred_x = 0; - state->cursor_at_end_of_line = 0; - state->initialized = 1; - state->single_line = (unsigned char) is_single_line; - state->insert_mode = 0; -} - -// API initialize -static void stb_textedit_initialize_state(STB_TexteditState *state, int is_single_line) -{ - stb_textedit_clear_state(state, is_single_line); -} -#endif//STB_TEXTEDIT_IMPLEMENTATION |