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stb_textedit: Add support for custom move word left/right handlers #273

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merged 1 commit into from
Aug 27, 2016
Merged

stb_textedit: Add support for custom move word left/right handlers #273

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61 changes: 35 additions & 26 deletions stb_textedit.h
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Original file line number Diff line number Diff line change
Expand Up @@ -148,15 +148,17 @@
// 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 WORDLEFT/WORDRIGHT
// 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
// 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
Expand Down Expand Up @@ -615,9 +617,9 @@ 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;
}

static int stb_textedit_move_to_word_previous( STB_TEXTEDIT_STRING *_str, STB_TexteditState *_state )
#ifndef STB_TEXTEDIT_MOVEWORDLEFT
static int stb_textedit_move_to_word_previous( STB_TEXTEDIT_STRING *_str, int c )
{
int c = _state->cursor - 1;
while( c >= 0 && !is_word_boundary( _str, c ) )
--c;

Expand All @@ -626,11 +628,13 @@ static int stb_textedit_move_to_word_previous( STB_TEXTEDIT_STRING *_str, STB_Te

return c;
}
#define STB_TEXTEDIT_MOVEWORDLEFT stb_textedit_move_to_word_previous
#endif

static int stb_textedit_move_to_word_next( STB_TEXTEDIT_STRING *_str, STB_TexteditState *_state )
#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);
int c = _state->cursor+1;
while( c < len && !is_word_boundary( _str, c ) )
++c;

Expand All @@ -639,6 +643,9 @@ static int stb_textedit_move_to_word_next( STB_TEXTEDIT_STRING *_str, STB_Texted

return c;
}
#define STB_TEXTEDIT_MOVEWORDRIGHT stb_textedit_move_to_word_next
#endif

#endif

// update selection and cursor to match each other
Expand Down Expand Up @@ -760,21 +767,12 @@ static void stb_textedit_key(STB_TEXTEDIT_STRING *str, STB_TexteditState *state,
state->has_preferred_x = 0;
break;

#ifdef STB_TEXTEDIT_IS_SPACE
#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_move_to_word_previous(str, state);
stb_textedit_clamp( str, state );
}
break;

case STB_TEXTEDIT_K_WORDRIGHT:
if (STB_TEXT_HAS_SELECTION(state))
stb_textedit_move_to_last(str, state);
else {
state->cursor = stb_textedit_move_to_word_next(str, state);
state->cursor = STB_TEXTEDIT_MOVEWORDLEFT(str, state->cursor-1);
stb_textedit_clamp( str, state );
}
break;
Expand All @@ -783,17 +781,28 @@ static void stb_textedit_key(STB_TEXTEDIT_STRING *str, STB_TexteditState *state,
if( !STB_TEXT_HAS_SELECTION( state ) )
stb_textedit_prep_selection_at_cursor(state);

state->cursor = stb_textedit_move_to_word_previous(str, state);
state->cursor = STB_TEXTEDIT_MOVEWORDLEFT(str, state->cursor-1);
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+1);
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_move_to_word_next(str, state);
state->cursor = STB_TEXTEDIT_MOVEWORDRIGHT(str, state->cursor+1);
state->select_end = state->cursor;

stb_textedit_clamp( str, state );
Expand Down