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/*
* RichEdit - Caret and selection functions.
*
* Copyright 2004 by Krzysztof Foltman
* Copyright 2005 by Phil Krylov
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "editor.h"
WINE_DEFAULT_DEBUG_CHANNEL(richedit);
void ME_SetCursorToStart(ME_TextEditor *editor, ME_Cursor *cursor)
{
cursor->para = editor_first_para( editor );
cursor->run = para_first_run( cursor->para );
cursor->nOffset = 0;
}
static void ME_SetCursorToEnd(ME_TextEditor *editor, ME_Cursor *cursor, BOOL final_eop)
{
cursor->para = para_prev( editor_end_para( editor ) );
cursor->run = para_end_run( cursor->para );
cursor->nOffset = final_eop ? cursor->run->len : 0;
}
int ME_GetSelectionOfs(ME_TextEditor *editor, int *from, int *to)
{
*from = ME_GetCursorOfs(&editor->pCursors[0]);
*to = ME_GetCursorOfs(&editor->pCursors[1]);
if (*from > *to)
{
int tmp = *from;
*from = *to;
*to = tmp;
return 1;
}
return 0;
}
int ME_GetSelection(ME_TextEditor *editor, ME_Cursor **from, ME_Cursor **to)
{
int from_ofs = ME_GetCursorOfs( &editor->pCursors[0] );
int to_ofs = ME_GetCursorOfs( &editor->pCursors[1] );
BOOL swap = (from_ofs > to_ofs);
if (from_ofs == to_ofs)
{
/* If cursor[0] is at the beginning of a run and cursor[1] at the end
of the prev run then we need to swap. */
if (editor->pCursors[0].nOffset < editor->pCursors[1].nOffset)
swap = TRUE;
}
if (!swap)
{
*from = &editor->pCursors[0];
*to = &editor->pCursors[1];
return 0;
} else {
*from = &editor->pCursors[1];
*to = &editor->pCursors[0];
return 1;
}
}
int ME_GetTextLength(ME_TextEditor *editor)
{
ME_Cursor cursor;
ME_SetCursorToEnd(editor, &cursor, FALSE);
return ME_GetCursorOfs(&cursor);
}
int ME_GetTextLengthEx(ME_TextEditor *editor, const GETTEXTLENGTHEX *how)
{
int length;
if (how->flags & GTL_PRECISE && how->flags & GTL_CLOSE)
return E_INVALIDARG;
if (how->flags & GTL_NUMCHARS && how->flags & GTL_NUMBYTES)
return E_INVALIDARG;
length = ME_GetTextLength(editor);
if ((editor->props & TXTBIT_MULTILINE)
&& (how->flags & GTL_USECRLF)
&& !editor->bEmulateVersion10) /* Ignore GTL_USECRLF flag in 1.0 emulation */
length += editor->nParagraphs - 1;
if (how->flags & GTL_NUMBYTES ||
(how->flags & GTL_PRECISE && /* GTL_PRECISE seems to imply GTL_NUMBYTES */
!(how->flags & GTL_NUMCHARS))) /* unless GTL_NUMCHARS is given */
{
CPINFO cpinfo;
if (how->codepage == 1200)
return length * 2;
if (how->flags & GTL_PRECISE)
FIXME("GTL_PRECISE flag unsupported. Using GTL_CLOSE\n");
if (GetCPInfo(how->codepage, &cpinfo))
return length * cpinfo.MaxCharSize;
ERR("Invalid codepage %u\n", how->codepage);
return E_INVALIDARG;
}
return length;
}
/******************************************************************
* set_selection_cursors
*
* Updates the selection cursors.
*
* Note that this does not invalidate either the old or the new selections.
*/
int set_selection_cursors(ME_TextEditor *editor, int from, int to)
{
int selectionEnd = 0;
const int len = ME_GetTextLength(editor);
/* all negative values are effectively the same */
if (from < 0)
from = -1;
if (to < 0)
to = -1;
/* select all */
if (from == 0 && to == -1)
{
ME_SetCursorToStart(editor, &editor->pCursors[1]);
ME_SetCursorToEnd(editor, &editor->pCursors[0], TRUE);
return len + 1;
}
/* if both values are equal and also out of bound, that means to */
/* put the selection at the end of the text */
if ((from == to) && (to < 0 || to > len))
{
selectionEnd = 1;
}
else
{
/* if from is negative and to is positive then selection is */
/* deselected and caret moved to end of the current selection */
if (from < 0)
{
int start, end;
ME_GetSelectionOfs(editor, &start, &end);
if (start != end)
{
if (end > len)
{
editor->pCursors[0].nOffset = 0;
end --;
}
editor->pCursors[1] = editor->pCursors[0];
}
return end;
}
/* adjust to if it's a negative value */
if (to < 0)
to = len + 1;
/* flip from and to if they are reversed */
if (from>to)
{
int tmp = from;
from = to;
to = tmp;
}
/* after fiddling with the values, we find from > len && to > len */
if (from > len)
selectionEnd = 1;
/* special case with to too big */
else if (to > len)
to = len + 1;
}
if (selectionEnd)
{
ME_SetCursorToEnd(editor, &editor->pCursors[0], FALSE);
editor->pCursors[1] = editor->pCursors[0];
return len;
}
cursor_from_char_ofs( editor, from, &editor->pCursors[1] );
editor->pCursors[0] = editor->pCursors[1];
ME_MoveCursorChars(editor, &editor->pCursors[0], to - from, FALSE);
/* Selection is not allowed in the middle of an end paragraph run. */
if (editor->pCursors[1].run->nFlags & MERF_ENDPARA)
editor->pCursors[1].nOffset = 0;
if (editor->pCursors[0].run->nFlags & MERF_ENDPARA)
{
if (to > len)
editor->pCursors[0].nOffset = editor->pCursors[0].run->len;
else
editor->pCursors[0].nOffset = 0;
}
return to;
}
void cursor_coords( ME_TextEditor *editor, ME_Cursor *cursor,
int *x, int *y, int *height )
{
ME_Row *row;
ME_Run *run = cursor->run;
ME_Paragraph *para = cursor->para;
ME_Run *size_run = run, *prev;
ME_Context c;
int run_x;
assert(~para->nFlags & MEPF_REWRAP);
row = row_from_cursor( cursor );
ME_InitContext(&c, editor, ITextHost_TxGetDC(editor->texthost));
if (!cursor->nOffset && (prev = run_prev( run ))) size_run = prev;
run_x = ME_PointFromCharContext( &c, run, cursor->nOffset, TRUE );
*height = size_run->nAscent + size_run->nDescent;
*x = c.rcView.left + run->pt.x + run_x - editor->horz_si.nPos;
*y = c.rcView.top + para->pt.y + row->nBaseline
+ run->pt.y - size_run->nAscent - editor->vert_si.nPos;
ME_DestroyContext(&c);
return;
}
void create_caret(ME_TextEditor *editor)
{
int x, y, height;
cursor_coords( editor, &editor->pCursors[0], &x, &y, &height );
ITextHost_TxCreateCaret(editor->texthost, NULL, 0, height);
editor->caret_height = height;
editor->caret_hidden = TRUE;
}
void show_caret(ME_TextEditor *editor)
{
ITextHost_TxShowCaret(editor->texthost, TRUE);
editor->caret_hidden = FALSE;
}
void hide_caret(ME_TextEditor *editor)
{
/* calls to HideCaret are cumulative; do so only once */
if (!editor->caret_hidden)
{
ITextHost_TxShowCaret(editor->texthost, FALSE);
editor->caret_hidden = TRUE;
}
}
void update_caret(ME_TextEditor *editor)
{
int x, y, height;
if (!editor->bHaveFocus) return;
if (!ME_IsSelection(editor))
{
cursor_coords( editor, &editor->pCursors[0], &x, &y, &height );
if (height != editor->caret_height) create_caret(editor);
x = min(x, editor->rcFormat.right-1);
ITextHost_TxSetCaretPos(editor->texthost, x, y);
show_caret(editor);
}
else
hide_caret(editor);
}
BOOL ME_InternalDeleteText(ME_TextEditor *editor, ME_Cursor *start,
int nChars, BOOL bForce)
{
ME_Cursor c = *start;
int nOfs = ME_GetCursorOfs(start), text_len = ME_GetTextLength( editor );
int shift = 0;
int totalChars = nChars;
ME_Paragraph *start_para;
BOOL delete_all = FALSE;
/* Prevent deletion past last end of paragraph run. */
nChars = min(nChars, text_len - nOfs);
if (nChars == text_len) delete_all = TRUE;
start_para = c.para;
if (!bForce)
{
table_protect_partial_deletion( editor, &c, &nChars );
if (nChars == 0) return FALSE;
}
while (nChars > 0)
{
ME_Run *run;
cursor_from_char_ofs( editor, nOfs + nChars, &c );
if (!c.nOffset)
{
/* We aren't deleting anything in this run, so we will go back to the
* last run we are deleting text in. */
c.run = run_prev_all_paras( c.run );
c.para = c.run->para;
c.nOffset = c.run->len;
}
run = c.run;
if (run->nFlags & MERF_ENDPARA)
{
int eollen = c.run->len;
BOOL keepFirstParaFormat;
if (!para_next( para_next( c.para ) )) return TRUE;
keepFirstParaFormat = (totalChars == nChars && nChars <= eollen &&
run->nCharOfs);
if (!editor->bEmulateVersion10) /* v4.1 */
{
ME_Paragraph *this_para = run->para;
ME_Paragraph *next_para = para_next( this_para );
/* The end of paragraph before a table row is only deleted if there
* is nothing else on the line before it. */
if (this_para == start_para && next_para->nFlags & MEPF_ROWSTART)
{
/* If the paragraph will be empty, then it should be deleted, however
* it still might have text right now which would inherit the
* MEPF_STARTROW property if we joined it right now.
* Instead we will delete it after the preceding text is deleted. */
if (nOfs > this_para->nCharOfs)
{
/* Skip this end of line. */
nChars -= (eollen < nChars) ? eollen : nChars;
continue;
}
keepFirstParaFormat = TRUE;
}
}
para_join( editor, c.para, keepFirstParaFormat );
/* ME_SkipAndPropagateCharOffset(p->pRun, shift); */
ME_CheckCharOffsets(editor);
nChars -= (eollen < nChars) ? eollen : nChars;
continue;
}
else
{
ME_Cursor cursor;
int nCharsToDelete = min(nChars, c.nOffset);
int i;
c.nOffset -= nCharsToDelete;
para_mark_rewrap( editor, c.run->para );
cursor = c;
/* nChars is the number of characters that should be deleted from the
PRECEDING runs (these BEFORE cursor.pRun)
nCharsToDelete is a number of chars to delete from THIS run */
nChars -= nCharsToDelete;
shift -= nCharsToDelete;
TRACE("Deleting %d (remaining %d) chars at %d in %s (%d)\n",
nCharsToDelete, nChars, c.nOffset,
debugstr_run( run ), run->len);
/* nOfs is a character offset (from the start of the document
to the current (deleted) run */
add_undo_insert_run( editor, nOfs + nChars, get_text( run, c.nOffset ), nCharsToDelete, run->nFlags, run->style );
ME_StrDeleteV(run->para->text, run->nCharOfs + c.nOffset, nCharsToDelete);
run->len -= nCharsToDelete;
TRACE("Post deletion string: %s (%d)\n", debugstr_run( run ), run->len);
TRACE("Shift value: %d\n", shift);
/* update cursors (including c) */
for (i=-1; i<editor->nCursors; i++) {
ME_Cursor *pThisCur = editor->pCursors + i;
if (i == -1) pThisCur = &c;
if (pThisCur->run == cursor.run) {
if (pThisCur->nOffset > cursor.nOffset) {
if (pThisCur->nOffset-cursor.nOffset < nCharsToDelete)
pThisCur->nOffset = cursor.nOffset;
else
pThisCur->nOffset -= nCharsToDelete;
assert(pThisCur->nOffset >= 0);
assert(pThisCur->nOffset <= run->len);
}
if (pThisCur->nOffset == run->len)
{
pThisCur->run = run_next( pThisCur->run );
assert( pThisCur->run );
pThisCur->nOffset = 0;
}
}
}
/* c = updated data now */
if (c.run == cursor.run) c.run->nCharOfs -= shift;
editor_propagate_char_ofs( NULL, c.run, shift );
if (!cursor.run->len)
{
TRACE("Removing empty run\n");
ME_Remove( run_get_di( cursor.run ));
ME_DestroyDisplayItem( run_get_di( cursor.run ));
}
shift = 0;
continue;
}
}
if (delete_all) editor_set_default_para_fmt( editor, &start_para->fmt );
return TRUE;
}
BOOL ME_DeleteTextAtCursor(ME_TextEditor *editor, int nCursor, int nChars)
{
assert(nCursor>=0 && nCursor<editor->nCursors);
/* text operations set modified state */
editor->nModifyStep = 1;
return ME_InternalDeleteText(editor, &editor->pCursors[nCursor],
nChars, FALSE);
}
static struct re_object* create_re_object(const REOBJECT *reo)
{
struct re_object *reobj = heap_alloc(sizeof(*reobj));
if (!reobj)
{
WARN("Fail to allocate re_object.\n");
return NULL;
}
ME_CopyReObject(&reobj->obj, reo, REO_GETOBJ_ALL_INTERFACES);
return reobj;
}
void ME_InsertOLEFromCursor(ME_TextEditor *editor, const REOBJECT* reo, int nCursor)
{
ME_Run *run, *prev;
const WCHAR space = ' ';
struct re_object *reobj_prev = NULL;
ME_Cursor *cursor = editor->pCursors + nCursor;
ME_Style *style = style_get_insert_style( editor, cursor );
/* FIXME no no no */
if (ME_IsSelection(editor))
ME_DeleteSelection(editor);
run = run_insert( editor, cursor, style, &space, 1, MERF_GRAPHICS );
run->reobj = create_re_object( reo );
prev = run;
while ((prev = run_prev_all_paras( prev )))
{
if (prev->reobj)
{
reobj_prev = prev->reobj;
break;
}
}
if (reobj_prev)
list_add_after(&reobj_prev->entry, &run->reobj->entry);
else
list_add_head(&editor->reobj_list, &run->reobj->entry);
ME_ReleaseStyle( style );
}
void ME_InsertEndRowFromCursor(ME_TextEditor *editor, int nCursor)
{
const WCHAR space = ' ';
ME_Cursor *cursor = editor->pCursors + nCursor;
ME_Style *style = style_get_insert_style( editor, cursor );
/* FIXME no no no */
if (ME_IsSelection(editor))
ME_DeleteSelection(editor);
run_insert( editor, cursor, style, &space, 1, MERF_ENDROW );
ME_ReleaseStyle( style );
}
void ME_InsertTextFromCursor(ME_TextEditor *editor, int nCursor,
const WCHAR *str, int len, ME_Style *style)
{
const WCHAR *pos;
ME_Cursor *cursor = editor->pCursors + nCursor;
int oldLen;
/* FIXME really HERE ? */
if (ME_IsSelection(editor))
ME_DeleteSelection(editor);
oldLen = ME_GetTextLength(editor);
/* text operations set modified state */
editor->nModifyStep = 1;
assert(style);
if (len == -1) len = lstrlenW( str );
/* grow the text limit to fit our text */
if (editor->nTextLimit < oldLen + len) editor->nTextLimit = oldLen + len;
pos = str;
while (len)
{
/* FIXME this sucks - no respect for unicode (what else can be a line separator in unicode?) */
while (pos - str < len && *pos != '\r' && *pos != '\n' && *pos != '\t')
pos++;
if (pos != str) /* handle text */
run_insert( editor, cursor, style, str, pos - str, 0 );
else if (*pos == '\t') /* handle tabs */
{
const WCHAR tab = '\t';
run_insert( editor, cursor, style, &tab, 1, MERF_TAB );
pos++;
}
else /* handle EOLs */
{
ME_Run *end_run, *run, *prev;
ME_Paragraph *new_para;
int eol_len = 0;
/* Check if new line is allowed for this control */
if (!(editor->props & TXTBIT_MULTILINE))
break;
/* Find number of CR and LF in end of paragraph run */
if (*pos =='\r')
{
if (len > 1 && pos[1] == '\n')
eol_len = 2;
else if (len > 2 && pos[1] == '\r' && pos[2] == '\n')
eol_len = 3;
else
eol_len = 1;
}
else
{
assert(*pos == '\n');
eol_len = 1;
}
pos += eol_len;
if (!editor->bEmulateVersion10 && eol_len == 3)
{
/* handle special \r\r\n sequence (richedit 2.x and higher only) */
const WCHAR space = ' ';
run_insert( editor, cursor, style, &space, 1, 0 );
}
else
{
const WCHAR cr = '\r', *eol_str = str;
if (!editor->bEmulateVersion10)
{
eol_str = &cr;
eol_len = 1;
}
if (cursor->nOffset == cursor->run->len)
{
run = run_next( cursor->run );
if (!run) run = cursor->run;
}
else
{
if (cursor->nOffset) run_split( editor, cursor );
run = cursor->run;
}
new_para = para_split( editor, run, style, eol_str, eol_len, 0 );
end_run = para_end_run( para_prev( new_para ) );
/* Move any cursors that were at the end of the previous run to the beginning of the new para */
prev = run_prev( end_run );
if (prev)
{
int i;
for (i = 0; i < editor->nCursors; i++)
{
if (editor->pCursors[i].run == prev &&
editor->pCursors[i].nOffset == prev->len)
{
editor->pCursors[i].para = new_para;
editor->pCursors[i].run = run;
editor->pCursors[i].nOffset = 0;
}
}
}
}
}
len -= pos - str;
str = pos;
}
}
/* Move the cursor nRelOfs characters (either forwards or backwards)
* If final_eop is TRUE, allow moving the cursor to the end of the final eop.
*
* returns the actual number of characters moved.
**/
int ME_MoveCursorChars(ME_TextEditor *editor, ME_Cursor *cursor, int nRelOfs, BOOL final_eop)
{
cursor->nOffset += nRelOfs;
if (cursor->nOffset < 0)
{
cursor->nOffset += cursor->run->nCharOfs;
if (cursor->nOffset >= 0)
{
/* new offset in the same paragraph */
do {
cursor->run = run_prev( cursor->run );
} while (cursor->nOffset < cursor->run->nCharOfs);
cursor->nOffset -= cursor->run->nCharOfs;
return nRelOfs;
}
cursor->nOffset += cursor->para->nCharOfs;
if (cursor->nOffset <= 0)
{
/* moved to the start of the text */
nRelOfs -= cursor->nOffset;
ME_SetCursorToStart(editor, cursor);
return nRelOfs;
}
/* new offset in a previous paragraph */
do {
cursor->para = para_prev( cursor->para );
} while (cursor->nOffset < cursor->para->nCharOfs);
cursor->nOffset -= cursor->para->nCharOfs;
cursor->run = para_end_run( cursor->para );
while (cursor->nOffset < cursor->run->nCharOfs)
cursor->run = run_prev( cursor->run );
cursor->nOffset -= cursor->run->nCharOfs;
}
else if (cursor->nOffset >= cursor->run->len)
{
ME_Paragraph *next_para;
int new_offset;
new_offset = ME_GetCursorOfs(cursor);
next_para = para_next( cursor->para );
if (new_offset < next_para->nCharOfs)
{
/* new offset in the same paragraph */
do {
cursor->nOffset -= cursor->run->len;
cursor->run = run_next( cursor->run );
} while (cursor->nOffset >= cursor->run->len);
return nRelOfs;
}
if (new_offset >= ME_GetTextLength(editor) + (final_eop ? 1 : 0))
{
/* new offset at the end of the text */
ME_SetCursorToEnd(editor, cursor, final_eop);
nRelOfs -= new_offset - (ME_GetTextLength(editor) + (final_eop ? 1 : 0));
return nRelOfs;
}
/* new offset in a following paragraph */
do {
cursor->para = next_para;
next_para = para_next( next_para );
} while (new_offset >= next_para->nCharOfs);
cursor->nOffset = new_offset - cursor->para->nCharOfs;
cursor->run = para_first_run( cursor->para );
while (cursor->nOffset >= cursor->run->len)
{
cursor->nOffset -= cursor->run->len;
cursor->run = run_next( cursor->run );
}
} /* else new offset is in the same run */
return nRelOfs;
}
BOOL
ME_MoveCursorWords(ME_TextEditor *editor, ME_Cursor *cursor, int nRelOfs)
{
ME_Run *run = cursor->run, *other_run;
ME_Paragraph *para = cursor->para;
int nOffset = cursor->nOffset;
if (nRelOfs == -1)
{
/* Backward movement */
while (TRUE)
{
nOffset = ME_CallWordBreakProc( editor, get_text( run, 0 ), run->len, nOffset, WB_MOVEWORDLEFT );
if (nOffset) break;
other_run = run_prev( run );
if (other_run)
{
if (ME_CallWordBreakProc( editor, get_text( other_run, 0 ), other_run->len, other_run->len - 1, WB_ISDELIMITER )
&& !(run->nFlags & MERF_ENDPARA)
&& !(cursor->run == run && cursor->nOffset == 0)
&& !ME_CallWordBreakProc( editor, get_text( run, 0 ), run->len, 0, WB_ISDELIMITER ))
break;
run = other_run;
nOffset = other_run->len;
}
else
{
if (cursor->run == run && cursor->nOffset == 0)
{
para = run->para;
/* Skip empty start of table row paragraph */
if (para_prev( para ) && para_prev( para )->nFlags & MEPF_ROWSTART)
para = para_prev( para );
/* Paragraph breaks are treated as separate words */
if (!para_prev( para )) return FALSE;
para = para_prev( para );
run = para_end_run( para );
}
break;
}
}
}
else
{
/* Forward movement */
BOOL last_delim = FALSE;
while (TRUE)
{
if (last_delim && !ME_CallWordBreakProc( editor, get_text( run, 0 ), run->len, nOffset, WB_ISDELIMITER ))
break;
nOffset = ME_CallWordBreakProc( editor, get_text( run, 0 ), run->len, nOffset, WB_MOVEWORDRIGHT );
if (nOffset < run->len) break;
other_run = run_next( run );
if (other_run)
{
last_delim = ME_CallWordBreakProc( editor, get_text( run, 0 ), run->len, nOffset - 1, WB_ISDELIMITER );
run = other_run;
nOffset = 0;
}
else
{
para = para_next( para );
if (!para_next( para ))
{
if (cursor->run == run) return FALSE;
nOffset = 0;
break;
}
if (para->nFlags & MEPF_ROWSTART) para = para_next( para );
if (cursor->run == run) run = para_first_run( para );
nOffset = 0;
break;
}
}
}
cursor->para = para;
cursor->run = run;
cursor->nOffset = nOffset;
return TRUE;
}
static void
ME_SelectByType(ME_TextEditor *editor, ME_SelectionType selectionType)
{
/* pCursor[0] is the end of the selection
* pCursor[1] is the start of the selection (or the position selection anchor)
* pCursor[2] and [3] are the selection anchors that are backed up
* so they are kept when the selection changes for drag selection.
*/
editor->nSelectionType = selectionType;
switch(selectionType)
{
case stPosition:
break;
case stWord:
ME_MoveCursorWords(editor, &editor->pCursors[0], +1);
editor->pCursors[1] = editor->pCursors[0];
ME_MoveCursorWords(editor, &editor->pCursors[1], -1);
break;
case stParagraph:
editor->pCursors[1] = editor->pCursors[0];
editor->pCursors[0].run = para_end_run( editor->pCursors[0].para );
editor->pCursors[0].para = editor->pCursors[0].run->para;
editor->pCursors[0].nOffset = editor->pCursors[0].run->len;
editor->pCursors[1].run = para_first_run( editor->pCursors[1].para );
editor->pCursors[1].nOffset = 0;
break;
case stLine:
{
ME_Row *row = row_from_cursor( editor->pCursors );
row_first_cursor( row, editor->pCursors + 1 );
row_end_cursor( row, editor->pCursors, TRUE );
break;
}
case stDocument:
/* Select everything with cursor anchored from the start of the text */
ME_SetCursorToStart(editor, &editor->pCursors[1]);
ME_SetCursorToEnd(editor, &editor->pCursors[0], TRUE);
break;
default: assert(0);
}
/* Store the anchor positions for extending the selection. */
editor->pCursors[2] = editor->pCursors[0];
editor->pCursors[3] = editor->pCursors[1];
}
int ME_GetCursorOfs(const ME_Cursor *cursor)
{
return cursor->para->nCharOfs + cursor->run->nCharOfs + cursor->nOffset;
}
/* Helper function for cursor_from_virtual_coords() to find paragraph within tables */
static ME_Paragraph *pixel_pos_in_table_row( int x, int y, ME_Paragraph *para )
{
ME_Cell *cell, *next_cell;
assert( para->nFlags & MEPF_ROWSTART );
cell = table_row_first_cell( para );
assert( cell );
/* find the cell we are in */
while ((next_cell = cell_next( cell )) != NULL)
{
if (x < next_cell->pt.x)
{
para = cell_first_para( cell );
/* Found the cell, but there might be multiple paragraphs in
* the cell, so need to search down the cell for the paragraph. */
while (cell == para_cell( para ))
{
if (y < para->pt.y + para->nHeight)
{
if (para->nFlags & MEPF_ROWSTART) return pixel_pos_in_table_row( x, y, para );
else return para;
}
para = para_next( para );
}
/* Past the end of the cell, so go back to the last cell paragraph */
return para_prev( para );
}
cell = next_cell;
}
/* Return table row delimiter */
para = table_row_end( para );
assert( para->nFlags & MEPF_ROWEND );
assert( para->fmt.dwMask & PFM_TABLEROWDELIMITER );
assert( para->fmt.wEffects & PFE_TABLEROWDELIMITER );
return para;
}
static BOOL row_cursor( ME_TextEditor *editor, ME_Row *row, int x,
ME_Cursor *cursor )
{
ME_Run *run, *last;
BOOL exact = TRUE;
if (x < row->pt.x)
{
x = row->pt.x;
exact = FALSE;
}
run = row_first_run( row );
assert( run );
cursor->nOffset = 0;
do
{
if (x >= run->pt.x && x < run->pt.x + run->nWidth)
{
cursor->nOffset = ME_CharFromPoint( editor, x - run->pt.x, run, TRUE, TRUE );
cursor->run = run;
cursor->para = run->para;
return exact;
}
last = run;
run = row_next_run( row, run );
} while (run);
run = last;
cursor->run = run;
cursor->para = run->para;
return FALSE;
}
/* Finds the run and offset from the pixel position.
*
* x & y are pixel positions in virtual coordinates into the rich edit control,
* so client coordinates must first be adjusted by the scroll position.
*
* If final_eop is TRUE consider the final end-of-paragraph.
*
* returns TRUE if the result was exactly under the cursor, otherwise returns
* FALSE, and result is set to the closest position to the coordinates.
*/
static BOOL cursor_from_virtual_coords( ME_TextEditor *editor, int x, int y,
ME_Cursor *result, BOOL final_eop )
{
ME_Paragraph *para = editor_first_para( editor );
ME_Row *row = NULL, *next_row;
BOOL isExact = TRUE;
x -= editor->rcFormat.left;
y -= editor->rcFormat.top;
/* find paragraph */
for (; para_next( para ); para = para_next( para ))
{
if (y < para->pt.y + para->nHeight)
{
if (para->nFlags & MEPF_ROWSTART)
para = pixel_pos_in_table_row( x, y, para );
y -= para->pt.y;
row = para_first_row( para );
break;
}
else if (para->nFlags & MEPF_ROWSTART)
{
para = table_row_end( para );
}
}
/* find row */
while (row)
{
if (y < row->pt.y + row->nHeight) break;
next_row = row_next( row );
if (!next_row) break;
row = next_row;
}
if (!row && !final_eop && para_prev( para ))
{
/* The position is below the last paragraph, so the last row will be used
* rather than the end of the text, so the x position will be used to
* determine the offset closest to the pixel position. */
isExact = FALSE;
row = para_end_row( para_prev( para ) );
}
if (row) return row_cursor( editor, row, x, result ) && isExact;
ME_SetCursorToEnd(editor, result, TRUE);
return FALSE;
}
/* Sets the cursor to the position closest to the pixel position
*
* x & y are pixel positions in client coordinates.
*
* isExact will be set to TRUE if the run is directly under the pixel
* position, FALSE if it not, unless isExact is set to NULL.
*
* return FALSE if outside client area and the cursor is not set,
* otherwise TRUE is returned.
*/
BOOL ME_CharFromPos(ME_TextEditor *editor, int x, int y,
ME_Cursor *cursor, BOOL *isExact)
{
RECT rc;
BOOL bResult;
ITextHost_TxGetClientRect(editor->texthost, &rc);
if (x < 0 || y < 0 || x >= rc.right || y >= rc.bottom) {
if (isExact) *isExact = FALSE;
return FALSE;
}
x += editor->horz_si.nPos;
y += editor->vert_si.nPos;
bResult = cursor_from_virtual_coords( editor, x, y, cursor, FALSE );
if (isExact) *isExact = bResult;
return TRUE;
}
/* Extends the selection with a word, line, or paragraph selection type.
*
* The selection is anchored by editor->pCursors[2-3] such that the text
* between the anchors will remain selected, and one end will be extended.
*
* editor->pCursors[0] should have the position to extend the selection to
* before this function is called.
*
* Nothing will be done if editor->nSelectionType equals stPosition.
*/
static void ME_ExtendAnchorSelection(ME_TextEditor *editor)
{
ME_Cursor tmp_cursor;
int curOfs, anchorStartOfs, anchorEndOfs;
if (editor->nSelectionType == stPosition || editor->nSelectionType == stDocument)
return;
curOfs = ME_GetCursorOfs(&editor->pCursors[0]);
anchorStartOfs = ME_GetCursorOfs(&editor->pCursors[3]);
anchorEndOfs = ME_GetCursorOfs(&editor->pCursors[2]);
tmp_cursor = editor->pCursors[0];
editor->pCursors[0] = editor->pCursors[2];
editor->pCursors[1] = editor->pCursors[3];
if (curOfs < anchorStartOfs)
{
/* Extend the left side of selection */
editor->pCursors[1] = tmp_cursor;
switch (editor->nSelectionType)
{
case stWord:
ME_MoveCursorWords(editor, &editor->pCursors[1], -1);
break;
case stLine:
{
ME_Row *row = row_from_cursor( editor->pCursors + 1 );
row_first_cursor( row, editor->pCursors + 1 );
break;
}
case stParagraph:
editor->pCursors[1].run = para_first_run( editor->pCursors[1].para );
editor->pCursors[1].nOffset = 0;
break;
default:
break;
}
}
else if (curOfs >= anchorEndOfs)
{
/* Extend the right side of selection */
editor->pCursors[0] = tmp_cursor;
switch (editor->nSelectionType)
{
case stWord:
ME_MoveCursorWords( editor, &editor->pCursors[0], +1 );
break;
case stLine:
{
ME_Row *row = row_from_cursor( editor->pCursors );
row_end_cursor( row, editor->pCursors, TRUE );
break;
}
case stParagraph:
editor->pCursors[0].run = para_end_run( editor->pCursors[0].para );
editor->pCursors[0].para = editor->pCursors[0].run->para;
editor->pCursors[0].nOffset = editor->pCursors[0].run->len;
break;
default:
break;
}
}
}
void ME_LButtonDown(ME_TextEditor *editor, int x, int y, int clickNum)
{
ME_Cursor tmp_cursor;
BOOL is_selection = FALSE, is_shift;
editor->nUDArrowX = -1;
x += editor->horz_si.nPos;
y += editor->vert_si.nPos;
tmp_cursor = editor->pCursors[0];
is_selection = ME_IsSelection(editor);
is_shift = GetKeyState(VK_SHIFT) < 0;
cursor_from_virtual_coords( editor, x, y, &editor->pCursors[0], FALSE );
if (x >= editor->rcFormat.left || is_shift)
{
if (clickNum > 1)
{
editor->pCursors[1] = editor->pCursors[0];
if (is_shift) {
if (x >= editor->rcFormat.left)
ME_SelectByType(editor, stWord);
else
ME_SelectByType(editor, stParagraph);
} else if (clickNum % 2 == 0) {
ME_SelectByType(editor, stWord);
} else {
ME_SelectByType(editor, stParagraph);
}
}
else if (!is_shift)
{
editor->nSelectionType = stPosition;
editor->pCursors[1] = editor->pCursors[0];
}
else if (!is_selection)
{
editor->nSelectionType = stPosition;
editor->pCursors[1] = tmp_cursor;
}
else if (editor->nSelectionType != stPosition)
{
ME_ExtendAnchorSelection(editor);
}
}
else
{
if (clickNum < 2) {
ME_SelectByType(editor, stLine);
} else if (clickNum % 2 == 0 || is_shift) {
ME_SelectByType(editor, stParagraph);
} else {
ME_SelectByType(editor, stDocument);
}
}
ME_InvalidateSelection(editor);
update_caret(editor);
ME_SendSelChange(editor);
}
void ME_MouseMove(ME_TextEditor *editor, int x, int y)
{
ME_Cursor tmp_cursor;
if (editor->nSelectionType == stDocument)
return;
x += editor->horz_si.nPos;
y += editor->vert_si.nPos;
tmp_cursor = editor->pCursors[0];
/* FIXME: do something with the return value of cursor_from_virtual_coords */
cursor_from_virtual_coords( editor, x, y, &tmp_cursor, TRUE );
ME_InvalidateSelection(editor);
editor->pCursors[0] = tmp_cursor;
ME_ExtendAnchorSelection(editor);
if (editor->nSelectionType != stPosition &&
memcmp(&editor->pCursors[1], &editor->pCursors[3], sizeof(ME_Cursor)))
/* The scroll the cursor towards the other end, since it was the one
* extended by ME_ExtendAnchorSelection */
editor_ensure_visible( editor, &editor->pCursors[1] );
else
editor_ensure_visible( editor, &editor->pCursors[0] );
ME_InvalidateSelection(editor);
update_caret(editor);
ME_SendSelChange(editor);
}
static int ME_GetXForArrow(ME_TextEditor *editor, ME_Cursor *pCursor)
{
ME_Run *run = pCursor->run;
int x;
if (editor->nUDArrowX != -1)
x = editor->nUDArrowX;
else
{
x = run->pt.x;
x += ME_PointFromChar( editor, run, pCursor->nOffset, TRUE );
editor->nUDArrowX = x;
}
return x;
}
static void cursor_move_line( ME_TextEditor *editor, ME_Cursor *cursor, BOOL up, BOOL extend )
{
ME_Paragraph *old_para = cursor->para, *new_para;
ME_Row *row = row_from_cursor( cursor );
int x = ME_GetXForArrow( editor, cursor );
if (up)
{
/* start of the previous row */
row = row_prev_all_paras( row );
if (!row)
{
if (extend) ME_SetCursorToStart( editor, cursor );
return;
}
new_para = row_para( row );
if (old_para->nFlags & MEPF_ROWEND ||
(para_cell( old_para ) && para_cell( old_para ) != para_cell( new_para )))
{
/* Brought out of a cell */
new_para = para_prev( table_row_start( old_para ));
if (!new_para) return; /* At the top, so don't go anywhere. */
row = para_first_row( new_para );
}
if (new_para->nFlags & MEPF_ROWEND)
{
/* Brought into a table row */
ME_Cell *cell = table_row_end_cell( new_para );
while (x < cell->pt.x && cell_prev( cell ))
cell = cell_prev( cell );
if (cell_next( cell )) /* else - we are still at the end of the row */
row = para_end_row( cell_end_para( cell ) );
}
}
else
{
/* start of the next row */
row = row_next_all_paras( row );
if (!row)
{
if (extend) ME_SetCursorToEnd( editor, cursor, TRUE );
return;
}
new_para = row_para( row );
if (old_para->nFlags & MEPF_ROWSTART ||
(para_cell( old_para ) && para_cell( old_para ) != para_cell( new_para )))
{
/* Brought out of a cell */
new_para = para_next( table_row_end( old_para ) );
if (!para_next( new_para )) return; /* At the bottom, so don't go anywhere. */
row = para_first_row( new_para );
}
if (new_para->nFlags & MEPF_ROWSTART)
{
/* Brought into a table row */
ME_Cell *cell = table_row_first_cell( new_para );
while (cell_next( cell ) && x >= cell_next( cell )->pt.x)
cell = cell_next( cell );
row = para_first_row( cell_first_para( cell ) );
}
}
if (!row) return;
row_cursor( editor, row, x, cursor );
}
static void ME_ArrowPageUp( ME_TextEditor *editor, ME_Cursor *cursor )
{
ME_Row *row = para_first_row( editor_first_para( editor ) ), *last_row;
int x, yd, old_scroll_pos = editor->vert_si.nPos;
if (editor->vert_si.nPos < row->nHeight)
{
ME_SetCursorToStart( editor, cursor );
/* Native clears seems to clear this x value on page up at the top
* of the text, but not on page down at the end of the text.
* Doesn't make sense, but we try to be bug for bug compatible. */
editor->nUDArrowX = -1;
}
else
{
x = ME_GetXForArrow( editor, cursor );
row = row_from_cursor( cursor );
ME_ScrollUp( editor, editor->sizeWindow.cy );
/* Only move the cursor by the amount scrolled. */
yd = cursor->para->pt.y + row->pt.y + editor->vert_si.nPos - old_scroll_pos;
last_row = row;
while ((row = row_prev_all_paras( row )))
{
if (row_para( row )->pt.y + row->pt.y < yd) break;
last_row = row;
}
row_cursor( editor, last_row, x, cursor );
}
}
static void ME_ArrowPageDown( ME_TextEditor *editor, ME_Cursor *cursor )
{
ME_Row *row = para_end_row( para_prev( editor_end_para( editor ) ) ), *last_row;
int x, yd, old_scroll_pos = editor->vert_si.nPos;
x = ME_GetXForArrow( editor, cursor );
if (editor->vert_si.nPos >= row_para( row )->pt.y + row->pt.y - editor->sizeWindow.cy)
ME_SetCursorToEnd( editor, cursor, FALSE );
else
{
row = row_from_cursor( cursor );
/* For native richedit controls:
* v1.0 - v3.1 can only scroll down as far as the scrollbar lets us
* v4.1 can scroll past this position here. */
ME_ScrollDown( editor, editor->sizeWindow.cy );
/* Only move the cursor by the amount scrolled. */
yd = cursor->para->pt.y + row->pt.y + editor->vert_si.nPos - old_scroll_pos;
last_row = row;
while ((row = row_next_all_paras( row )))
{
if (row_para( row )->pt.y + row->pt.y >= yd) break;
last_row = row;
}
row_cursor( editor, last_row, x, cursor );
}
}
static void ME_ArrowHome( ME_TextEditor *editor, ME_Cursor *cursor )
{
ME_Row *row = row_from_cursor( cursor );
row_first_cursor( row, cursor );
}
static void ME_ArrowCtrlHome(ME_TextEditor *editor, ME_Cursor *pCursor)
{
ME_SetCursorToStart(editor, pCursor);
}
static void ME_ArrowEnd( ME_TextEditor *editor, ME_Cursor *cursor )
{
ME_Row *row = row_from_cursor( cursor );
row_end_cursor( row, cursor, FALSE );
}
static void ME_ArrowCtrlEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
{
ME_SetCursorToEnd(editor, pCursor, FALSE);
}
BOOL ME_IsSelection(ME_TextEditor *editor)
{
return editor->pCursors[0].run != editor->pCursors[1].run ||
editor->pCursors[0].nOffset != editor->pCursors[1].nOffset;
}
void ME_DeleteSelection(ME_TextEditor *editor)
{
int from, to;
int nStartCursor = ME_GetSelectionOfs(editor, &from, &to);
int nEndCursor = nStartCursor ^ 1;
ME_DeleteTextAtCursor(editor, nStartCursor, to - from);
editor->pCursors[nEndCursor] = editor->pCursors[nStartCursor];
}
ME_Style *ME_GetSelectionInsertStyle(ME_TextEditor *editor)
{
return style_get_insert_style( editor, editor->pCursors );
}
void ME_SendSelChange(ME_TextEditor *editor)
{
SELCHANGE sc;
sc.nmhdr.hwndFrom = NULL;
sc.nmhdr.idFrom = 0;
sc.nmhdr.code = EN_SELCHANGE;
ME_GetSelectionOfs(editor, &sc.chrg.cpMin, &sc.chrg.cpMax);
sc.seltyp = SEL_EMPTY;
if (sc.chrg.cpMin != sc.chrg.cpMax)
sc.seltyp |= SEL_TEXT;
if (sc.chrg.cpMin < sc.chrg.cpMax+1) /* what were RICHEDIT authors thinking ? */
sc.seltyp |= SEL_MULTICHAR;
if (sc.chrg.cpMin != editor->notified_cr.cpMin || sc.chrg.cpMax != editor->notified_cr.cpMax)
{
ME_ClearTempStyle(editor);
editor->notified_cr = sc.chrg;
if (editor->nEventMask & ENM_SELCHANGE)
{
TRACE("cpMin=%d cpMax=%d seltyp=%d (%s %s)\n",
sc.chrg.cpMin, sc.chrg.cpMax, sc.seltyp,
(sc.seltyp & SEL_TEXT) ? "SEL_TEXT" : "",
(sc.seltyp & SEL_MULTICHAR) ? "SEL_MULTICHAR" : "");
ITextHost_TxNotify(editor->texthost, sc.nmhdr.code, &sc);
}
}
}
BOOL
ME_ArrowKey(ME_TextEditor *editor, int nVKey, BOOL extend, BOOL ctrl)
{
int nCursor = 0;
ME_Cursor *p = &editor->pCursors[nCursor];
ME_Cursor tmp_curs = *p;
BOOL success = FALSE;
ME_CheckCharOffsets(editor);
switch(nVKey) {
case VK_LEFT:
if (ctrl)
success = ME_MoveCursorWords(editor, &tmp_curs, -1);
else
success = ME_MoveCursorChars(editor, &tmp_curs, -1, extend);
break;
case VK_RIGHT:
if (ctrl)
success = ME_MoveCursorWords(editor, &tmp_curs, +1);
else
success = ME_MoveCursorChars(editor, &tmp_curs, +1, extend);
break;
case VK_UP:
cursor_move_line( editor, &tmp_curs, TRUE, extend );
break;
case VK_DOWN:
cursor_move_line( editor, &tmp_curs, FALSE, extend );
break;
case VK_PRIOR:
ME_ArrowPageUp(editor, &tmp_curs);
break;
case VK_NEXT:
ME_ArrowPageDown(editor, &tmp_curs);
break;
case VK_HOME: {
if (ctrl)
ME_ArrowCtrlHome(editor, &tmp_curs);
else
ME_ArrowHome(editor, &tmp_curs);
break;
}
case VK_END:
if (ctrl)
ME_ArrowCtrlEnd(editor, &tmp_curs);
else
ME_ArrowEnd(editor, &tmp_curs);
break;
}
if (!extend)
editor->pCursors[1] = tmp_curs;
*p = tmp_curs;
ME_InvalidateSelection(editor);
ME_Repaint(editor);
hide_caret(editor);
editor_ensure_visible( editor, &tmp_curs );
update_caret(editor);
ME_SendSelChange(editor);
return success;
}
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