+++ /dev/null
-// [ImGui] this is a slightly modified version of stb_textedit.h 1.12. Those changes would need to be pushed into nothings/stb
-// [ImGui] - 2018-06: fixed undo/redo after pasting large amount of text (over 32 kb). Redo will still fail when undo buffers are exhausted, but text won't be corrupted (see nothings/stb issue #620)
-// [ImGui] - 2018-06: fix in stb_textedit_discard_redo (see https://github.com/nothings/stb/issues/321)
-// [ImGui] - fixed some minor warnings
-
-// stb_textedit.h - v1.12 - 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
-//
-// See end of file for license information.
-//
-//
-// 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
-//
-// 1.12 (2018-01-29) user can change STB_TEXTEDIT_KEYTYPE, fix redo to avoid crash
-// 1.11 (2017-03-03) fix HOME on last line, dragging off single-line textfield
-// 1.10 (2016-10-25) supress warnings about casting away const with -Wcast-qual
-// 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 in 1.6
-//
-// Bugfixes:
-// Scott Graham
-// Daniel Keller
-// Omar Cornut
-// Dan Thompson
-//
-// 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 + 3 * 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 is 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, STB_TEXEDIT_KEYTYPE 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. STB_TEXTEDIT_KEYTYPE defaults to int, but you can #define it to
-// anything other type you wante before including.
-//
-//
-// 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;
- STB_TEXTEDIT_POSITIONTYPE insert_length;
- STB_TEXTEDIT_POSITIONTYPE delete_length;
- int 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;
- int 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)
-{
- // In single-line mode, just always make y = 0. This lets the drag keep working if the mouse
- // goes off the top or bottom of the text
- if( state->single_line )
- {
- StbTexteditRow r;
- STB_TEXTEDIT_LAYOUTROW(&r, str, 0);
- y = r.ymin;
- }
-
- 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 = 0;
-
- // In single-line mode, just always make y = 0. This lets the drag keep working if the mouse
- // goes off the top or bottom of the text
- if( state->single_line )
- {
- StbTexteditRow r;
- STB_TEXTEDIT_LAYOUTROW(&r, str, 0);
- y = r.ymin;
- }
-
- if (state->select_start == state->select_end)
- state->select_start = state->cursor;
-
- p = stb_text_locate_coord(str, x, y);
- 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_internal(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, STB_TEXTEDIT_CHARTYPE *text, int len)
-{
- // 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;
-}
-
-#ifndef STB_TEXTEDIT_KEYTYPE
-#define STB_TEXTEDIT_KEYTYPE int
-#endif
-
-// API key: process a keyboard input
-static void stb_textedit_key(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, STB_TEXTEDIT_KEYTYPE 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 -= n;
- STB_TEXTEDIT_memmove(state->undo_char, state->undo_char + n, (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 -= n; // @OPTIMIZE: get rid of char_storage and infer it
- }
- --state->undo_point;
- STB_TEXTEDIT_memmove(state->undo_rec, state->undo_rec+1, (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;
- // move the remaining redo character data to the end of the buffer
- state->redo_char_point += n;
- STB_TEXTEDIT_memmove(state->undo_char + state->redo_char_point, state->undo_char + state->redo_char_point-n, (size_t) ((STB_TEXTEDIT_UNDOCHARCOUNT - state->redo_char_point)*sizeof(STB_TEXTEDIT_CHARTYPE)));
- // adjust the position of all the other records to account for above memmove
- for (i=state->redo_point; i < k; ++i)
- if (state->undo_rec[i].char_storage >= 0)
- state->undo_rec[i].char_storage += n;
- }
- // now move all the redo records towards the end of the buffer; the first one is at 'redo_point'
- STB_TEXTEDIT_memmove(state->undo_rec + state->redo_point+1, state->undo_rec + state->redo_point, (size_t) ((STB_TEXTEDIT_UNDOSTATECOUNT - state->redo_point)*sizeof(state->undo_rec[0])));
- // now move redo_point to point to the new one
- ++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 = (STB_TEXTEDIT_POSITIONTYPE) insert_len;
- r->delete_length = (STB_TEXTEDIT_POSITIONTYPE) delete_len;
-
- if (insert_len == 0) {
- r->char_storage = -1;
- return NULL;
- } else {
- r->char_storage = state->undo_char_point;
- state->undo_char_point += 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) {
- // should never happen:
- if (s->redo_point == STB_TEXTEDIT_UNDOSTATECOUNT)
- return;
- // there's currently not enough room, so discard a redo record
- stb_textedit_discard_redo(s);
- }
- 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 - 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);
-}
-
-#if defined(__GNUC__) || defined(__clang__)
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wcast-qual"
-#endif
-
-static int stb_textedit_paste(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, STB_TEXTEDIT_CHARTYPE const *ctext, int len)
-{
- return stb_textedit_paste_internal(str, state, (STB_TEXTEDIT_CHARTYPE *) ctext, len);
-}
-
-#if defined(__GNUC__) || defined(__clang__)
-#pragma GCC diagnostic pop
-#endif
-
-#endif//STB_TEXTEDIT_IMPLEMENTATION
-
-/*
-------------------------------------------------------------------------------
-This software is available under 2 licenses -- choose whichever you prefer.
-------------------------------------------------------------------------------
-ALTERNATIVE A - MIT License
-Copyright (c) 2017 Sean Barrett
-Permission is hereby granted, free of charge, to any person obtaining a copy of
-this software and associated documentation files (the "Software"), to deal in
-the Software without restriction, including without limitation the rights to
-use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
-of the Software, and to permit persons to whom the Software is furnished to do
-so, subject to the following conditions:
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
-------------------------------------------------------------------------------
-ALTERNATIVE B - Public Domain (www.unlicense.org)
-This is free and unencumbered software released into the public domain.
-Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
-software, either in source code form or as a compiled binary, for any purpose,
-commercial or non-commercial, and by any means.
-In jurisdictions that recognize copyright laws, the author or authors of this
-software dedicate any and all copyright interest in the software to the public
-domain. We make this dedication for the benefit of the public at large and to
-the detriment of our heirs and successors. We intend this dedication to be an
-overt act of relinquishment in perpetuity of all present and future rights to
-this software under copyright law.
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
-ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
-WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-------------------------------------------------------------------------------
-*/
projects / mesa.git / blobdiff