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wine/dlls/riched20/caret.c
Dylan Smith d20e057d8e richedit: Accept paragraph as parameter for ME_CharOfsFromRunOfs. 
Rather than get the paragraph from the run, the function allows the
caller to provide the paragraph, since it is already available.  This
reduces unnecessary traversals of lists that take longer as more runs
and rows are in the paragraph.
2009-02-06 14:50:27 +01:00

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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);
static BOOL
ME_MoveCursorChars(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs);
void ME_GetSelection(ME_TextEditor *editor, int *from, int *to)
{
*from = ME_GetCursorOfs(editor, 0);
*to = ME_GetCursorOfs(editor, 1);
if (*from > *to)
{
int tmp = *from;
*from = *to;
*to = tmp;
}
}
int ME_GetTextLength(ME_TextEditor *editor)
{
ME_DisplayItem *pLast = editor->pBuffer->pLast;
return ME_CharOfsFromRunOfs(editor, pLast->member.para.prev_para,
ME_FindItemBack(pLast, diRun), 0);
}
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->styleFlags & ES_MULTILINE)
&& (how->flags & GTL_USECRLF)
&& !editor->bEmulateVersion10) /* Ignore GTL_USECRLF flag in 1.0 emulation */
length += editor->nParagraphs - 1;
if (how->flags & GTL_NUMBYTES)
{
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;
}
int ME_SetSelection(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)
{
editor->pCursors[1].pRun = ME_FindItemFwd(editor->pBuffer->pFirst, diRun);
editor->pCursors[1].nOffset = 0;
editor->pCursors[0].pRun = ME_FindItemBack(editor->pBuffer->pLast, diRun);
editor->pCursors[0].nOffset = 0;
ME_InvalidateSelection(editor);
ME_ClearTempStyle(editor);
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_GetSelection(editor, &start, &end);
editor->pCursors[1] = editor->pCursors[0];
ME_Repaint(editor);
ME_ClearTempStyle(editor);
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)
{
editor->pCursors[1].pRun = editor->pCursors[0].pRun = ME_FindItemBack(editor->pBuffer->pLast, diRun);
editor->pCursors[1].nOffset = editor->pCursors[0].nOffset = 0;
ME_InvalidateSelection(editor);
ME_ClearTempStyle(editor);
return len;
}
ME_CursorFromCharOfs(editor, from, &editor->pCursors[1]);
ME_CursorFromCharOfs(editor, to, &editor->pCursors[0]);
/* Selection is not allowed in the middle of an end paragraph run. */
if (editor->pCursors[1].pRun->member.run.nFlags & MERF_ENDPARA)
editor->pCursors[1].nOffset = 0;
if (editor->pCursors[0].pRun->member.run.nFlags & MERF_ENDPARA)
editor->pCursors[0].nOffset = 0;
return to;
}
void
ME_GetCursorCoordinates(ME_TextEditor *editor, ME_Cursor *pCursor,
int *x, int *y, int *height)
{
ME_DisplayItem *pCursorRun = pCursor->pRun;
ME_DisplayItem *pSizeRun = pCursor->pRun;
assert(height && x && y);
assert(!(ME_GetParagraph(pCursorRun)->member.para.nFlags & MEPF_REWRAP));
assert(pCursor->pRun);
assert(pCursor->pRun->type == diRun);
if (pCursorRun->type == diRun) {
ME_DisplayItem *row = ME_FindItemBack(pCursorRun, diStartRowOrParagraph);
if (row) {
HDC hDC = ITextHost_TxGetDC(editor->texthost);
ME_Context c;
ME_DisplayItem *run = pCursorRun;
ME_DisplayItem *para = NULL;
SIZE sz = {0, 0};
ME_InitContext(&c, editor, hDC);
if (!pCursor->nOffset)
{
ME_DisplayItem *prev = ME_FindItemBack(pCursorRun, diRunOrParagraph);
assert(prev);
if (prev->type == diRun)
pSizeRun = prev;
}
assert(row->type == diStartRow); /* paragraph -> run without start row ?*/
para = ME_FindItemBack(row, diParagraph);
assert(para);
assert(para->type == diParagraph);
if (editor->bCaretAtEnd && !pCursor->nOffset &&
run == ME_FindItemFwd(row, diRun))
{
ME_DisplayItem *tmp = ME_FindItemBack(row, diRunOrParagraph);
assert(tmp);
if (tmp->type == diRun)
{
row = ME_FindItemBack(tmp, diStartRow);
pSizeRun = run = tmp;
assert(run);
assert(run->type == diRun);
sz = ME_GetRunSize(&c, &para->member.para,
&run->member.run, ME_StrLen(run->member.run.strText),
row->member.row.nLMargin);
}
}
if (pCursor->nOffset) {
sz = ME_GetRunSize(&c, &para->member.para, &run->member.run, pCursor->nOffset,
row->member.row.nLMargin);
}
*height = pSizeRun->member.run.nAscent + pSizeRun->member.run.nDescent;
*x = c.rcView.left + run->member.run.pt.x + sz.cx - editor->horz_si.nPos;
*y = c.rcView.top + para->member.para.pt.y + row->member.row.nBaseline
+ run->member.run.pt.y - pSizeRun->member.run.nAscent - editor->vert_si.nPos;
ME_DestroyContext(&c);
return;
}
}
*height = 10; /* FIXME use global font */
*x = 0;
*y = 0;
}
void
ME_MoveCaret(ME_TextEditor *editor)
{
int x, y, height;
ME_GetCursorCoordinates(editor, &editor->pCursors[0], &x, &y, &height);
if(editor->bHaveFocus && !ME_IsSelection(editor))
{
x = min(x, editor->rcFormat.right-1);
ITextHost_TxCreateCaret(editor->texthost, NULL, 0, height);
ITextHost_TxSetCaretPos(editor->texthost, x, y);
}
}
void ME_ShowCaret(ME_TextEditor *ed)
{
ME_MoveCaret(ed);
if(ed->bHaveFocus && !ME_IsSelection(ed))
ITextHost_TxShowCaret(ed->texthost, TRUE);
}
void ME_HideCaret(ME_TextEditor *ed)
{
if(!ed->bHaveFocus || ME_IsSelection(ed))
{
ITextHost_TxShowCaret(ed->texthost, FALSE);
DestroyCaret();
}
}
BOOL ME_InternalDeleteText(ME_TextEditor *editor, int nOfs, int nChars,
BOOL bForce)
{
ME_Cursor c;
int shift = 0;
int totalChars = nChars;
ME_DisplayItem *start_para;
/* Prevent deletion past last end of paragraph run. */
nChars = min(nChars, ME_GetTextLength(editor) - nOfs);
ME_CursorFromCharOfs(editor, nOfs, &c);
start_para = ME_GetParagraph(c.pRun);
if (!bForce)
{
ME_ProtectPartialTableDeletion(editor, nOfs, &nChars);
if (nChars == 0)
return FALSE;
}
while(nChars > 0)
{
ME_Run *run;
ME_CursorFromCharOfs(editor, nOfs+nChars, &c);
if (!c.nOffset &&
nOfs+nChars == (c.pRun->member.run.nCharOfs
+ ME_GetParagraph(c.pRun)->member.para.nCharOfs))
{
/* We aren't deleting anything in this run, so we will go back to the
* last run we are deleting text in. */
c.pRun = ME_FindItemBack(c.pRun, diRun);
c.nOffset = c.pRun->member.run.strText->nLen;
}
run = &c.pRun->member.run;
if (run->nFlags & MERF_ENDPARA) {
int eollen = c.pRun->member.run.strText->nLen;
BOOL keepFirstParaFormat;
if (!ME_FindItemFwd(c.pRun, diParagraph))
{
return TRUE;
}
keepFirstParaFormat = (totalChars == nChars && nChars <= eollen &&
run->nCharOfs);
if (!editor->bEmulateVersion10) /* v4.1 */
{
ME_DisplayItem *next_para = ME_FindItemFwd(c.pRun, diParagraphOrEnd);
ME_DisplayItem *this_para = next_para->member.para.prev_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->member.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->member.para.nCharOfs) {
/* Skip this end of line. */
nChars -= (eollen < nChars) ? eollen : nChars;
continue;
}
keepFirstParaFormat = TRUE;
}
}
ME_JoinParagraphs(editor, ME_GetParagraph(c.pRun), 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;
ME_FindItemBack(c.pRun, diParagraph)->member.para.nFlags |= MEPF_REWRAP;
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 (remaning %d) chars at %d in '%s' (%d)\n",
nCharsToDelete, nChars, c.nOffset,
debugstr_w(run->strText->szData), run->strText->nLen);
if (!c.nOffset && ME_StrVLen(run->strText) == nCharsToDelete)
{
/* undo = reinsert whole run */
/* nOfs is a character offset (from the start of the document
to the current (deleted) run */
ME_UndoItem *pUndo = ME_AddUndoItem(editor, diUndoInsertRun, c.pRun);
if (pUndo)
pUndo->di.member.run.nCharOfs = nOfs+nChars;
}
else
{
/* undo = reinsert partial run */
ME_UndoItem *pUndo = ME_AddUndoItem(editor, diUndoInsertRun, c.pRun);
if (pUndo) {
ME_DestroyString(pUndo->di.member.run.strText);
pUndo->di.member.run.nCharOfs = nOfs+nChars;
pUndo->di.member.run.strText = ME_MakeStringN(run->strText->szData+c.nOffset, nCharsToDelete);
}
}
TRACE("Post deletion string: %s (%d)\n", debugstr_w(run->strText->szData), run->strText->nLen);
TRACE("Shift value: %d\n", shift);
ME_StrDeleteV(run->strText, c.nOffset, nCharsToDelete);
/* update cursors (including c) */
for (i=-1; i<editor->nCursors; i++) {
ME_Cursor *pThisCur = editor->pCursors + i;
if (i == -1) pThisCur = &c;
if (pThisCur->pRun == cursor.pRun) {
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 <= ME_StrVLen(run->strText));
}
if (pThisCur->nOffset == ME_StrVLen(run->strText))
{
pThisCur->pRun = ME_FindItemFwd(pThisCur->pRun, diRunOrParagraphOrEnd);
assert(pThisCur->pRun->type == diRun);
pThisCur->nOffset = 0;
}
}
}
/* c = updated data now */
if (c.pRun == cursor.pRun)
ME_SkipAndPropagateCharOffset(c.pRun, shift);
else
ME_PropagateCharOffset(c.pRun, shift);
if (!ME_StrVLen(cursor.pRun->member.run.strText))
{
TRACE("Removing useless run\n");
ME_Remove(cursor.pRun);
ME_DestroyDisplayItem(cursor.pRun);
}
shift = 0;
/*
ME_CheckCharOffsets(editor);
*/
continue;
}
}
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, ME_GetCursorOfs(editor, nCursor), nChars,
FALSE);
}
static ME_DisplayItem *
ME_InternalInsertTextFromCursor(ME_TextEditor *editor, int nCursor,
const WCHAR *str, int len, ME_Style *style,
int flags)
{
ME_Cursor *p = &editor->pCursors[nCursor];
editor->bCaretAtEnd = FALSE;
assert(p->pRun->type == diRun);
return ME_InsertRunAtCursor(editor, p, style, str, len, flags);
}
void ME_InsertOLEFromCursor(ME_TextEditor *editor, const REOBJECT* reo, int nCursor)
{
ME_Style *pStyle = ME_GetInsertStyle(editor, nCursor);
ME_DisplayItem *di;
WCHAR space = ' ';
/* FIXME no no no */
if (ME_IsSelection(editor))
ME_DeleteSelection(editor);
di = ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, pStyle,
MERF_GRAPHICS);
di->member.run.ole_obj = ALLOC_OBJ(*reo);
ME_CopyReObject(di->member.run.ole_obj, reo);
ME_SendSelChange(editor);
}
void ME_InsertEndRowFromCursor(ME_TextEditor *editor, int nCursor)
{
ME_Style *pStyle = ME_GetInsertStyle(editor, nCursor);
ME_DisplayItem *di;
WCHAR space = ' ';
/* FIXME no no no */
if (ME_IsSelection(editor))
ME_DeleteSelection(editor);
di = ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, pStyle,
MERF_ENDROW);
ME_SendSelChange(editor);
}
void ME_InsertTextFromCursor(ME_TextEditor *editor, int nCursor,
const WCHAR *str, int len, ME_Style *style)
{
const WCHAR *pos;
ME_Cursor *p = NULL;
int oldLen;
/* FIXME really HERE ? */
if (ME_IsSelection(editor))
ME_DeleteSelection(editor);
/* FIXME: is this too slow? */
/* Didn't affect performance for WM_SETTEXT (around 50sec/30K) */
oldLen = ME_GetTextLength(editor);
/* text operations set modified state */
editor->nModifyStep = 1;
assert(style);
assert(nCursor>=0 && nCursor<editor->nCursors);
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 */
ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
} else if (*pos == '\t') { /* handle tabs */
WCHAR tab = '\t';
ME_InternalInsertTextFromCursor(editor, nCursor, &tab, 1, style, MERF_TAB);
pos++;
} else { /* handle EOLs */
ME_DisplayItem *tp, *end_run;
ME_Style *tmp_style;
int eol_len = 0;
/* 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) */
WCHAR space = ' ';
ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, style, 0);
} else {
ME_String *eol_str;
if (!editor->bEmulateVersion10) {
WCHAR cr = '\r';
eol_str = ME_MakeStringN(&cr, 1);
} else {
eol_str = ME_MakeStringN(str, eol_len);
}
p = &editor->pCursors[nCursor];
if (p->nOffset) {
ME_SplitRunSimple(editor, p->pRun, p->nOffset);
p = &editor->pCursors[nCursor];
}
tmp_style = ME_GetInsertStyle(editor, nCursor);
/* ME_SplitParagraph increases style refcount */
tp = ME_SplitParagraph(editor, p->pRun, p->pRun->member.run.style, eol_str, 0);
p->pRun = ME_FindItemFwd(tp, diRun);
end_run = ME_FindItemBack(tp, diRun);
ME_ReleaseStyle(end_run->member.run.style);
end_run->member.run.style = tmp_style;
p->nOffset = 0;
}
}
len -= pos - str;
str = pos;
}
}
static BOOL
ME_MoveCursorChars(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs)
{
ME_DisplayItem *pRun = pCursor->pRun;
if (nRelOfs == -1)
{
if (!pCursor->nOffset)
{
do {
pRun = ME_FindItemBack(pRun, diRunOrParagraph);
assert(pRun);
switch (pRun->type)
{
case diRun:
break;
case diParagraph:
if (pRun->member.para.prev_para->type == diTextStart)
return FALSE;
pRun = ME_FindItemBack(pRun, diRunOrParagraph);
/* every paragraph ought to have at least one run */
assert(pRun && pRun->type == diRun);
assert(pRun->member.run.nFlags & MERF_ENDPARA);
break;
default:
assert(pRun->type != diRun && pRun->type != diParagraph);
return FALSE;
}
} while (RUN_IS_HIDDEN(&pRun->member.run) ||
pRun->member.run.nFlags & MERF_HIDDEN);
pCursor->pRun = pRun;
if (pRun->member.run.nFlags & MERF_ENDPARA)
pCursor->nOffset = 0;
else
pCursor->nOffset = pRun->member.run.strText->nLen;
}
if (pCursor->nOffset)
pCursor->nOffset = ME_StrRelPos2(pCursor->pRun->member.run.strText, pCursor->nOffset, nRelOfs);
return TRUE;
}
else
{
if (!(pRun->member.run.nFlags & MERF_ENDPARA))
{
int new_ofs = ME_StrRelPos2(pRun->member.run.strText, pCursor->nOffset, nRelOfs);
if (new_ofs < pRun->member.run.strText->nLen)
{
pCursor->nOffset = new_ofs;
return TRUE;
}
}
do {
pRun = ME_FindItemFwd(pRun, diRun);
} while (pRun && (RUN_IS_HIDDEN(&pRun->member.run) ||
pRun->member.run.nFlags & MERF_HIDDEN));
if (pRun)
{
pCursor->pRun = pRun;
pCursor->nOffset = 0;
return TRUE;
}
}
return FALSE;
}
static BOOL
ME_MoveCursorWords(ME_TextEditor *editor, ME_Cursor *cursor, int nRelOfs)
{
ME_DisplayItem *pRun = cursor->pRun, *pOtherRun;
int nOffset = cursor->nOffset;
if (nRelOfs == -1)
{
/* Backward movement */
while (TRUE)
{
nOffset = ME_CallWordBreakProc(editor, pRun->member.run.strText,
nOffset, WB_MOVEWORDLEFT);
if (nOffset)
break;
pOtherRun = ME_FindItemBack(pRun, diRunOrParagraph);
if (pOtherRun->type == diRun)
{
if (ME_CallWordBreakProc(editor, pOtherRun->member.run.strText,
pOtherRun->member.run.strText->nLen - 1,
WB_ISDELIMITER)
&& !(pRun->member.run.nFlags & MERF_ENDPARA)
&& !(cursor->pRun == pRun && cursor->nOffset == 0)
&& !ME_CallWordBreakProc(editor, pRun->member.run.strText, 0,
WB_ISDELIMITER))
break;
pRun = pOtherRun;
nOffset = pOtherRun->member.run.strText->nLen;
}
else if (pOtherRun->type == diParagraph)
{
if (cursor->pRun == pRun && cursor->nOffset == 0)
{
/* Skip empty start of table row paragraph */
if (pOtherRun->member.para.prev_para->member.para.nFlags & MEPF_ROWSTART)
pOtherRun = pOtherRun->member.para.prev_para;
/* Paragraph breaks are treated as separate words */
if (pOtherRun->member.para.prev_para->type == diTextStart)
return FALSE;
pRun = ME_FindItemBack(pOtherRun, diRunOrParagraph);
}
break;
}
}
}
else
{
/* Forward movement */
BOOL last_delim = FALSE;
while (TRUE)
{
if (last_delim && !ME_CallWordBreakProc(editor, pRun->member.run.strText,
nOffset, WB_ISDELIMITER))
break;
nOffset = ME_CallWordBreakProc(editor, pRun->member.run.strText,
nOffset, WB_MOVEWORDRIGHT);
if (nOffset < pRun->member.run.strText->nLen)
break;
pOtherRun = ME_FindItemFwd(pRun, diRunOrParagraphOrEnd);
if (pOtherRun->type == diRun)
{
last_delim = ME_CallWordBreakProc(editor, pRun->member.run.strText,
nOffset - 1, WB_ISDELIMITER);
pRun = pOtherRun;
nOffset = 0;
}
else if (pOtherRun->type == diParagraph)
{
if (pOtherRun->member.para.nFlags & MEPF_ROWSTART)
pOtherRun = pOtherRun->member.para.next_para;
if (cursor->pRun == pRun)
pRun = ME_FindItemFwd(pOtherRun, diRun);
nOffset = 0;
break;
}
else /* diTextEnd */
{
if (cursor->pRun == pRun)
return FALSE;
nOffset = 0;
break;
}
}
}
cursor->pRun = pRun;
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 stLine:
case stParagraph:
{
ME_DisplayItem *pItem;
ME_DIType fwdSearchType, backSearchType;
if (selectionType == stParagraph) {
backSearchType = diParagraph;
fwdSearchType = diParagraphOrEnd;
} else {
backSearchType = diStartRow;
fwdSearchType = diStartRowOrParagraphOrEnd;
}
pItem = ME_FindItemFwd(editor->pCursors[0].pRun, fwdSearchType);
assert(pItem);
if (pItem->type == diTextEnd)
editor->pCursors[0].pRun = ME_FindItemBack(pItem, diRun);
else
editor->pCursors[0].pRun = ME_FindItemFwd(pItem, diRun);
editor->pCursors[0].nOffset = 0;
pItem = ME_FindItemBack(pItem, backSearchType);
editor->pCursors[1].pRun = ME_FindItemFwd(pItem, diRun);
editor->pCursors[1].nOffset = 0;
break;
}
case stDocument:
/* Select everything with cursor anchored from the start of the text */
editor->nSelectionType = stDocument;
editor->pCursors[1].pRun = ME_FindItemFwd(editor->pBuffer->pFirst, diRun);
editor->pCursors[1].nOffset = 0;
editor->pCursors[0].pRun = ME_FindItemBack(editor->pBuffer->pLast, diRun);
editor->pCursors[0].nOffset = 0;
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(ME_TextEditor *editor, int nCursor)
{
ME_Cursor *pCursor = &editor->pCursors[nCursor];
return ME_GetParagraph(pCursor->pRun)->member.para.nCharOfs
+ pCursor->pRun->member.run.nCharOfs + pCursor->nOffset;
}
/* Helper function for ME_FindPixelPos to find paragraph within tables */
static ME_DisplayItem* ME_FindPixelPosInTableRow(int x, int y,
ME_DisplayItem *para)
{
ME_DisplayItem *cell, *next_cell;
assert(para->member.para.nFlags & MEPF_ROWSTART);
cell = para->member.para.next_para->member.para.pCell;
assert(cell);
/* find the cell we are in */
while ((next_cell = cell->member.cell.next_cell) != NULL) {
if (x < next_cell->member.cell.pt.x)
{
para = ME_FindItemFwd(cell, diParagraph);
/* 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->member.para.pCell) {
if (y < para->member.para.pt.y + para->member.para.nHeight)
{
if (para->member.para.nFlags & MEPF_ROWSTART)
return ME_FindPixelPosInTableRow(x, y, para);
else
return para;
}
para = para->member.para.next_para;
}
/* Past the end of the cell, so go back to the last cell paragraph */
return para->member.para.prev_para;
}
cell = next_cell;
}
/* Return table row delimiter */
para = ME_FindItemFwd(cell, diParagraph);
assert(para->member.para.nFlags & MEPF_ROWEND);
assert(para->member.para.pFmt->dwMask & PFM_TABLEROWDELIMITER);
assert(para->member.para.pFmt->wEffects & PFE_TABLEROWDELIMITER);
return para;
}
static BOOL ME_ReturnFoundPos(ME_TextEditor *editor, ME_DisplayItem *found,
ME_Cursor *result, int rx, BOOL isExact)
{
assert(found);
assert(found->type == diRun);
if ((found->member.run.nFlags & MERF_ENDPARA) || rx < 0)
rx = 0;
result->pRun = found;
result->nOffset = ME_CharFromPointCursor(editor, rx, &found->member.run);
if (editor->pCursors[0].nOffset == found->member.run.strText->nLen && rx)
{
result->pRun = ME_FindItemFwd(editor->pCursors[0].pRun, diRun);
result->nOffset = 0;
}
return isExact;
}
/* 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.
*
* 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 ME_FindPixelPos(ME_TextEditor *editor, int x, int y,
ME_Cursor *result, BOOL *is_eol)
{
ME_DisplayItem *p = editor->pBuffer->pFirst->member.para.next_para;
ME_DisplayItem *last = NULL;
int rx = 0;
BOOL isExact = TRUE;
x -= editor->rcFormat.left;
y -= editor->rcFormat.top;
if (is_eol)
*is_eol = 0;
/* find paragraph */
for (; p != editor->pBuffer->pLast; p = p->member.para.next_para)
{
assert(p->type == diParagraph);
if (y < p->member.para.pt.y + p->member.para.nHeight)
{
if (p->member.para.nFlags & MEPF_ROWSTART)
p = ME_FindPixelPosInTableRow(x, y, p);
y -= p->member.para.pt.y;
p = ME_FindItemFwd(p, diStartRow);
break;
} else if (p->member.para.nFlags & MEPF_ROWSTART) {
p = ME_GetTableRowEnd(p);
}
}
/* find row */
for (; p != editor->pBuffer->pLast; )
{
ME_DisplayItem *pp;
assert(p->type == diStartRow);
if (y < p->member.row.pt.y + p->member.row.nHeight)
{
p = ME_FindItemFwd(p, diRun);
break;
}
pp = ME_FindItemFwd(p, diStartRowOrParagraphOrEnd);
if (pp->type != diStartRow)
{
p = ME_FindItemFwd(p, diRun);
break;
}
p = pp;
}
if (p == editor->pBuffer->pLast)
{
/* 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;
p = ME_FindItemBack(p, diStartRow);
if (p != NULL){
p = ME_FindItemFwd(p, diRun);
}
else
{
p = editor->pBuffer->pLast;
}
}
for (; p != editor->pBuffer->pLast; p = p->next)
{
switch (p->type)
{
case diRun:
rx = x - p->member.run.pt.x;
if (rx < p->member.run.nWidth)
return ME_ReturnFoundPos(editor, p, result, rx, isExact);
break;
case diStartRow:
isExact = FALSE;
p = ME_FindItemFwd(p, diRun);
if (is_eol) *is_eol = 1;
rx = 0; /* FIXME not sure */
return ME_ReturnFoundPos(editor, p, result, rx, isExact);
case diCell:
case diParagraph:
case diTextEnd:
isExact = FALSE;
rx = 0; /* FIXME not sure */
p = last;
return ME_ReturnFoundPos(editor, p, result, rx, isExact);
default: assert(0);
}
last = p;
}
result->pRun = ME_FindItemBack(p, diRun);
result->nOffset = 0;
assert(result->pRun->member.run.nFlags & MERF_ENDPARA);
return FALSE;
}
/* Returns the character offset 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.
*/
int ME_CharFromPos(ME_TextEditor *editor, int x, int y, BOOL *isExact)
{
ME_Cursor cursor;
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 -1;
}
x += editor->horz_si.nPos;
y += editor->vert_si.nPos;
bResult = ME_FindPixelPos(editor, x, y, &cursor, NULL);
if (isExact) *isExact = bResult;
return (ME_GetParagraph(cursor.pRun)->member.para.nCharOfs
+ cursor.pRun->member.run.nCharOfs + cursor.nOffset);
}
/* 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, 0);
anchorStartOfs = ME_GetCursorOfs(editor, 3);
anchorEndOfs = ME_GetCursorOfs(editor, 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;
if (editor->nSelectionType == stWord)
ME_MoveCursorWords(editor, &editor->pCursors[1], -1);
else
{
ME_DisplayItem *pItem;
ME_DIType searchType = ((editor->nSelectionType == stLine) ?
diStartRowOrParagraph:diParagraph);
pItem = ME_FindItemBack(editor->pCursors[1].pRun, searchType);
editor->pCursors[1].pRun = ME_FindItemFwd(pItem, diRun);
editor->pCursors[1].nOffset = 0;
}
}
else if (curOfs >= anchorEndOfs)
{
/* Extend the right side of selection */
editor->pCursors[0] = tmp_cursor;
if (editor->nSelectionType == stWord)
ME_MoveCursorWords(editor, &editor->pCursors[0], +1);
else
{
ME_DisplayItem *pItem;
ME_DIType searchType = ((editor->nSelectionType == stLine) ?
diStartRowOrParagraphOrEnd:diParagraphOrEnd);
pItem = ME_FindItemFwd(editor->pCursors[0].pRun, searchType);
if (pItem->type == diTextEnd)
editor->pCursors[0].pRun = ME_FindItemBack(pItem, diRun);
else
editor->pCursors[0].pRun = ME_FindItemFwd(pItem, diRun);
editor->pCursors[0].nOffset = 0;
}
}
}
void ME_LButtonDown(ME_TextEditor *editor, int x, int y, int clickNum)
{
ME_Cursor tmp_cursor;
int is_selection = 0;
BOOL 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;
ME_FindPixelPos(editor, x, y, &editor->pCursors[0], &editor->bCaretAtEnd);
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);
ITextHost_TxShowCaret(editor->texthost, FALSE);
ME_ShowCaret(editor);
ME_ClearTempStyle(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 ME_FindPixelPos */
ME_FindPixelPos(editor, x, y, &tmp_cursor, &editor->bCaretAtEnd);
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 */
ME_EnsureVisible(editor, &editor->pCursors[1]);
} else {
ME_EnsureVisible(editor, &editor->pCursors[0]);
}
ME_InvalidateSelection(editor);
ITextHost_TxShowCaret(editor->texthost, FALSE);
ME_ShowCaret(editor);
ME_SendSelChange(editor);
}
static ME_DisplayItem *ME_FindRunInRow(ME_TextEditor *editor, ME_DisplayItem *pRow,
int x, int *pOffset, int *pbCaretAtEnd)
{
ME_DisplayItem *pNext, *pLastRun;
pNext = ME_FindItemFwd(pRow, diRunOrStartRow);
assert(pNext->type == diRun);
pLastRun = pNext;
if (pbCaretAtEnd) *pbCaretAtEnd = FALSE;
if (pOffset) *pOffset = 0;
do {
int run_x = pNext->member.run.pt.x;
int width = pNext->member.run.nWidth;
if (x < run_x)
{
return pNext;
}
if (x >= run_x && x < run_x+width)
{
int ch = ME_CharFromPointCursor(editor, x-run_x, &pNext->member.run);
ME_String *s = pNext->member.run.strText;
if (ch < s->nLen) {
if (pOffset)
*pOffset = ch;
return pNext;
}
}
pLastRun = pNext;
pNext = ME_FindItemFwd(pNext, diRunOrStartRow);
} while(pNext && pNext->type == diRun);
if ((pLastRun->member.run.nFlags & MERF_ENDPARA) == 0)
{
pNext = ME_FindItemFwd(pNext, diRun);
if (pbCaretAtEnd) *pbCaretAtEnd = TRUE;
return pNext;
} else {
return pLastRun;
}
}
static int ME_GetXForArrow(ME_TextEditor *editor, ME_Cursor *pCursor)
{
ME_DisplayItem *pRun = pCursor->pRun;
int x;
if (editor->nUDArrowX != -1)
x = editor->nUDArrowX;
else {
if (editor->bCaretAtEnd)
{
pRun = ME_FindItemBack(pRun, diRun);
assert(pRun);
x = pRun->member.run.pt.x + pRun->member.run.nWidth;
}
else {
x = pRun->member.run.pt.x;
x += ME_PointFromChar(editor, &pRun->member.run, pCursor->nOffset);
}
editor->nUDArrowX = x;
}
return x;
}
static void
ME_MoveCursorLines(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs)
{
ME_DisplayItem *pRun = pCursor->pRun;
ME_DisplayItem *pItem, *pOldPara, *pNewPara;
int x = ME_GetXForArrow(editor, pCursor);
if (editor->bCaretAtEnd && !pCursor->nOffset)
pRun = ME_FindItemBack(pRun, diRun);
if (!pRun)
return;
pOldPara = ME_GetParagraph(pRun);
if (nRelOfs == -1)
{
/* start of this row */
pItem = ME_FindItemBack(pRun, diStartRow);
assert(pItem);
/* start of the previous row */
pItem = ME_FindItemBack(pItem, diStartRow);
if (!pItem)
return; /* row not found - ignore */
pNewPara = ME_GetParagraph(pItem);
if (pOldPara->member.para.nFlags & MEPF_ROWEND ||
(pOldPara->member.para.pCell &&
pOldPara->member.para.pCell != pNewPara->member.para.pCell))
{
/* Brought out of a cell */
pNewPara = ME_GetTableRowStart(pOldPara)->member.para.prev_para;
if (pNewPara->type == diTextStart)
return; /* At the top, so don't go anywhere. */
pItem = ME_FindItemFwd(pNewPara, diStartRow);
}
if (pNewPara->member.para.nFlags & MEPF_ROWEND)
{
/* Brought into a table row */
ME_Cell *cell = &ME_FindItemBack(pNewPara, diCell)->member.cell;
while (x < cell->pt.x && cell->prev_cell)
cell = &cell->prev_cell->member.cell;
if (cell->next_cell) /* else - we are still at the end of the row */
pItem = ME_FindItemBack(cell->next_cell, diStartRow);
}
}
else
{
/* start of the next row */
pItem = ME_FindItemFwd(pRun, diStartRow);
if (!pItem)
return; /* row not found - ignore */
/* FIXME If diParagraph is before diStartRow, wrap the next paragraph?
*/
pNewPara = ME_GetParagraph(pItem);
if (pOldPara->member.para.nFlags & MEPF_ROWSTART ||
(pOldPara->member.para.pCell &&
pOldPara->member.para.pCell != pNewPara->member.para.pCell))
{
/* Brought out of a cell */
pNewPara = ME_GetTableRowEnd(pOldPara)->member.para.next_para;
if (pNewPara->type == diTextEnd)
return; /* At the bottom, so don't go anywhere. */
pItem = ME_FindItemFwd(pNewPara, diStartRow);
}
if (pNewPara->member.para.nFlags & MEPF_ROWSTART)
{
/* Brought into a table row */
ME_DisplayItem *cell = ME_FindItemFwd(pNewPara, diCell);
while (cell->member.cell.next_cell &&
x >= cell->member.cell.next_cell->member.cell.pt.x)
cell = cell->member.cell.next_cell;
pItem = ME_FindItemFwd(cell, diStartRow);
}
}
if (!pItem)
{
/* row not found - ignore */
return;
}
pCursor->pRun = ME_FindRunInRow(editor, pItem, x, &pCursor->nOffset, &editor->bCaretAtEnd);
assert(pCursor->pRun);
assert(pCursor->pRun->type == diRun);
}
static void ME_ArrowPageUp(ME_TextEditor *editor, ME_Cursor *pCursor)
{
ME_DisplayItem *p = ME_FindItemFwd(editor->pBuffer->pFirst, diStartRow);
if (editor->vert_si.nPos < p->member.row.nHeight)
{
pCursor->pRun = ME_FindItemFwd(editor->pBuffer->pFirst, diRun);
pCursor->nOffset = 0;
editor->bCaretAtEnd = FALSE;
/* 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 {
ME_DisplayItem *pRun = pCursor->pRun;
ME_DisplayItem *pLast;
int x, y, ys, yd, yp, yprev;
int yOldScrollPos = editor->vert_si.nPos;
x = ME_GetXForArrow(editor, pCursor);
if (!pCursor->nOffset && editor->bCaretAtEnd)
pRun = ME_FindItemBack(pRun, diRun);
p = ME_FindItemBack(pRun, diStartRowOrParagraph);
assert(p->type == diStartRow);
yp = ME_FindItemBack(p, diParagraph)->member.para.pt.y;
yprev = ys = y = yp + p->member.row.pt.y;
ME_ScrollUp(editor, editor->sizeWindow.cy);
/* Only move the cursor by the amount scrolled. */
yd = y + editor->vert_si.nPos - yOldScrollPos;
pLast = p;
do {
p = ME_FindItemBack(p, diStartRowOrParagraph);
if (!p)
break;
if (p->type == diParagraph) { /* crossing paragraphs */
if (p->member.para.prev_para == NULL)
break;
yp = p->member.para.prev_para->member.para.pt.y;
continue;
}
y = yp + p->member.row.pt.y;
if (y < yd)
break;
pLast = p;
yprev = y;
} while(1);
pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset,
&editor->bCaretAtEnd);
}
assert(pCursor->pRun);
assert(pCursor->pRun->type == diRun);
}
static void ME_ArrowPageDown(ME_TextEditor *editor, ME_Cursor *pCursor)
{
ME_DisplayItem *pLast;
int x, y;
/* Find y position of the last row */
pLast = editor->pBuffer->pLast;
y = pLast->member.para.prev_para->member.para.pt.y
+ ME_FindItemBack(pLast, diStartRow)->member.row.pt.y;
x = ME_GetXForArrow(editor, pCursor);
if (editor->vert_si.nPos >= y - editor->sizeWindow.cy)
{
pCursor->pRun = ME_FindItemBack(editor->pBuffer->pLast, diRun);
pCursor->nOffset = 0;
editor->bCaretAtEnd = FALSE;
} else {
ME_DisplayItem *pRun = pCursor->pRun;
ME_DisplayItem *p;
int ys, yd, yp, yprev;
int yOldScrollPos = editor->vert_si.nPos;
if (!pCursor->nOffset && editor->bCaretAtEnd)
pRun = ME_FindItemBack(pRun, diRun);
p = ME_FindItemBack(pRun, diStartRowOrParagraph);
assert(p->type == diStartRow);
yp = ME_FindItemBack(p, diParagraph)->member.para.pt.y;
yprev = ys = y = yp + p->member.row.pt.y;
/* 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 = y + editor->vert_si.nPos - yOldScrollPos;
pLast = p;
do {
p = ME_FindItemFwd(p, diStartRowOrParagraph);
if (!p)
break;
if (p->type == diParagraph) {
yp = p->member.para.pt.y;
continue;
}
y = yp + p->member.row.pt.y;
if (y >= yd)
break;
pLast = p;
yprev = y;
} while(1);
pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset,
&editor->bCaretAtEnd);
}
assert(pCursor->pRun);
assert(pCursor->pRun->type == diRun);
}
static void ME_ArrowHome(ME_TextEditor *editor, ME_Cursor *pCursor)
{
ME_DisplayItem *pRow = ME_FindItemBack(pCursor->pRun, diStartRow);
if (pRow) {
ME_DisplayItem *pRun;
if (editor->bCaretAtEnd && !pCursor->nOffset) {
pRow = ME_FindItemBack(pRow, diStartRow);
if (!pRow)
return;
}
pRun = ME_FindItemFwd(pRow, diRun);
if (pRun) {
pCursor->pRun = pRun;
pCursor->nOffset = 0;
}
}
editor->bCaretAtEnd = FALSE;
}
static void ME_ArrowCtrlHome(ME_TextEditor *editor, ME_Cursor *pCursor)
{
ME_DisplayItem *pRow = ME_FindItemBack(pCursor->pRun, diTextStart);
if (pRow) {
ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
if (pRun) {
pCursor->pRun = pRun;
pCursor->nOffset = 0;
}
}
}
static void ME_ArrowEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
{
ME_DisplayItem *pRow;
if (editor->bCaretAtEnd && !pCursor->nOffset)
return;
pRow = ME_FindItemFwd(pCursor->pRun, diStartRowOrParagraphOrEnd);
assert(pRow);
if (pRow->type == diStartRow) {
/* FIXME WTF was I thinking about here ? */
ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
assert(pRun);
pCursor->pRun = pRun;
pCursor->nOffset = 0;
editor->bCaretAtEnd = 1;
return;
}
pCursor->pRun = ME_FindItemBack(pRow, diRun);
assert(pCursor->pRun && pCursor->pRun->member.run.nFlags & MERF_ENDPARA);
pCursor->nOffset = 0;
editor->bCaretAtEnd = FALSE;
}
static void ME_ArrowCtrlEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
{
ME_DisplayItem *p = ME_FindItemFwd(pCursor->pRun, diTextEnd);
assert(p);
p = ME_FindItemBack(p, diRun);
assert(p);
assert(p->member.run.nFlags & MERF_ENDPARA);
pCursor->pRun = p;
pCursor->nOffset = 0;
editor->bCaretAtEnd = FALSE;
}
BOOL ME_IsSelection(ME_TextEditor *editor)
{
return memcmp(&editor->pCursors[0], &editor->pCursors[1], sizeof(ME_Cursor))!=0;
}
static int ME_GetSelCursor(ME_TextEditor *editor, int dir)
{
int cdir = ME_GetCursorOfs(editor, 0) - ME_GetCursorOfs(editor, 1);
if (cdir*dir>0)
return 0;
else
return 1;
}
void ME_DeleteSelection(ME_TextEditor *editor)
{
int from, to;
ME_GetSelection(editor, &from, &to);
ME_DeleteTextAtCursor(editor, ME_GetSelCursor(editor,-1), to-from);
}
ME_Style *ME_GetSelectionInsertStyle(ME_TextEditor *editor)
{
return ME_GetInsertStyle(editor, 0);
}
void ME_SendSelChange(ME_TextEditor *editor)
{
SELCHANGE sc;
if (!(editor->nEventMask & ENM_SELCHANGE))
return;
sc.nmhdr.code = EN_SELCHANGE;
ME_GetSelection(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) /* wth were RICHEDIT authors thinking ? */
sc.seltyp |= SEL_MULTICHAR;
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" : "");
if (sc.chrg.cpMin != editor->notified_cr.cpMin || sc.chrg.cpMax != editor->notified_cr.cpMax)
{
ME_ClearTempStyle(editor);
editor->notified_cr = sc.chrg;
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:
editor->bCaretAtEnd = 0;
if (ctrl)
success = ME_MoveCursorWords(editor, &tmp_curs, -1);
else
success = ME_MoveCursorChars(editor, &tmp_curs, -1);
break;
case VK_RIGHT:
editor->bCaretAtEnd = 0;
if (ctrl)
success = ME_MoveCursorWords(editor, &tmp_curs, +1);
else
success = ME_MoveCursorChars(editor, &tmp_curs, +1);
break;
case VK_UP:
ME_MoveCursorLines(editor, &tmp_curs, -1);
break;
case VK_DOWN:
ME_MoveCursorLines(editor, &tmp_curs, +1);
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);
editor->bCaretAtEnd = 0;
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);
ITextHost_TxShowCaret(editor->texthost, FALSE);
ME_EnsureVisible(editor, &tmp_curs);
ME_ShowCaret(editor);
ME_SendSelChange(editor);
return success;
}
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