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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)
{
return ME_CharOfsFromRunOfs(editor, ME_FindItemBack(editor->pBuffer->pLast, diRun), 0);
}
int ME_GetTextLengthEx(ME_TextEditor *editor, 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 (how->flags & GTL_USECRLF)
length += editor->nParagraphs;
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;
}
void ME_SetSelection(ME_TextEditor *editor, int from, int to)
{
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_Repaint(editor);
ME_ClearTempStyle(editor);
return;
}
if (from == -1)
{
editor->pCursors[1] = editor->pCursors[0];
ME_Repaint(editor);
ME_ClearTempStyle(editor);
return;
}
if (from>to)
{
int tmp = from;
from = to;
to = tmp;
}
ME_RunOfsFromCharOfs(editor, from, &editor->pCursors[1].pRun, &editor->pCursors[1].nOffset);
ME_RunOfsFromCharOfs(editor, to, &editor->pCursors[0].pRun, &editor->pCursors[0].nOffset);
}
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(!pCursor->nOffset || !editor->bCaretAtEnd);
assert(height && x && y);
if (pCursorRun->type == diRun) {
ME_DisplayItem *row = ME_FindItemBack(pCursorRun, diStartRowOrParagraph);
if (row) {
HDC hDC = GetDC(editor->hWnd);
ME_Context c;
ME_DisplayItem *run = pCursorRun;
ME_DisplayItem *para;
SIZE sz = {0, 0};
ME_InitContext(&c, editor, hDC);
if (!pCursor->nOffset && !editor->bCaretAtEnd)
{
ME_DisplayItem *prev = ME_FindItemBack(pCursorRun, diRunOrStartRow);
if (prev->type == diRun)
pSizeRun = prev;
}
assert(row->type == diStartRow); /* paragraph -> run without start row ?*/
para = ME_FindItemBack(row, diParagraph);
if (editor->bCaretAtEnd && !pCursor->nOffset &&
run == ME_FindItemFwd(row, diRun))
{
ME_DisplayItem *tmp = ME_FindItemBack(row, diRunOrParagraph);
if (tmp->type == diRun)
{
row = ME_FindItemBack(tmp, diStartRow);
pSizeRun = run = tmp;
sz = ME_GetRunSize(&c, &para->member.para, &run->member.run, ME_StrLen(run->member.run.strText));
}
}
if (pCursor->nOffset && !(run->member.run.nFlags & MERF_SKIPPED)) {
sz = ME_GetRunSize(&c, &para->member.para, &run->member.run, pCursor->nOffset);
}
*height = pSizeRun->member.run.nAscent + pSizeRun->member.run.nDescent;
*x = run->member.run.pt.x + sz.cx;
*y = para->member.para.nYPos + row->member.row.nBaseline + pSizeRun->member.run.pt.y - pSizeRun->member.run.nAscent - ME_GetYScrollPos(editor);
ME_DestroyContext(&c);
ReleaseDC(editor->hWnd, hDC);
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);
CreateCaret(editor->hWnd, NULL, 0, height);
SetCaretPos(x, y);
}
void ME_ShowCaret(ME_TextEditor *ed)
{
ME_MoveCaret(ed);
ShowCaret(ed->hWnd);
}
void ME_HideCaret(ME_TextEditor *ed)
{
HideCaret(ed->hWnd);
DestroyCaret();
}
void ME_InternalDeleteText(ME_TextEditor *editor, int nOfs,
int nChars)
{
ME_Cursor c;
int shift = 0;
while(nChars > 0)
{
ME_Run *run;
ME_CursorFromCharOfs(editor, nOfs, &c);
run = &c.pRun->member.run;
if (run->nFlags & MERF_ENDPARA) {
if (!ME_FindItemFwd(c.pRun, diParagraph))
{
return;
}
ME_JoinParagraphs(editor, ME_GetParagraph(c.pRun));
/* ME_SkipAndPropagateCharOffset(p->pRun, shift); */
ME_CheckCharOffsets(editor);
nChars--;
if (editor->bEmulateVersion10 && nChars)
nChars--;
continue;
}
else
{
ME_Cursor cursor;
int nIntendedChars = nChars;
int nCharsToDelete = nChars;
int i;
int loc = c.nOffset;
ME_FindItemBack(c.pRun, diParagraph)->member.para.nFlags |= MEPF_REWRAP;
cursor = c;
ME_StrRelPos(run->strText, loc, &nChars);
/* nChars is the number of characters that should be deleted from the
FOLLOWING runs (these AFTER cursor.pRun)
nCharsToDelete is a number of chars to delete from THIS run */
nCharsToDelete -= nChars;
shift -= nCharsToDelete;
TRACE("Deleting %d (intended %d-remaning %d) chars at %d in '%s' (%d)\n",
nCharsToDelete, nIntendedChars, 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;
}
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;
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;
}
}
}
void ME_DeleteTextAtCursor(ME_TextEditor *editor, int nCursor,
int nChars)
{
assert(nCursor>=0 && nCursor<editor->nCursors);
ME_InternalDeleteText(editor, ME_GetCursorOfs(editor, nCursor), nChars);
}
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);
}
/* FIXME this is temporary, just to have something to test how bad graphics handler is */
void ME_InsertGraphicsFromCursor(ME_TextEditor *editor, int nCursor)
{
ME_Style *pStyle = ME_GetInsertStyle(editor, nCursor);
WCHAR space = ' ';
/* FIXME no no no */
if (ME_IsSelection(editor))
ME_DeleteSelection(editor);
ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, pStyle,
MERF_GRAPHICS);
ME_SendSelChange(editor);
}
void
ME_InsertTableCellFromCursor(ME_TextEditor *editor, int nCursor)
{
WCHAR tab = '\t';
ME_DisplayItem *p, *run;
ME_Style *pStyle = ME_GetInsertStyle(editor, nCursor);
p = ME_InternalInsertTextFromCursor(editor, nCursor, &tab, 1, pStyle,
MERF_CELL);
run = p;
while ((run = ME_FindItemBack(run, diRunOrParagraph))->type == diRun)
{
if (run->member.run.nFlags & MERF_CELL)
{
assert(run->member.run.pCell->next);
p->member.run.pCell = run->member.run.pCell->next;
return;
}
}
assert(run->type == diParagraph);
assert(run->member.para.bTable);
assert(run->member.para.pCells);
p->member.run.pCell = run->member.para.pCells;
}
void ME_InsertTextFromCursor(ME_TextEditor *editor, int nCursor,
const WCHAR *str, int len, ME_Style *style)
{
const WCHAR *pos;
ME_Cursor *p = NULL;
assert(style);
/* FIXME really HERE ? */
if (ME_IsSelection(editor))
ME_DeleteSelection(editor);
assert(nCursor>=0 && nCursor<editor->nCursors);
if (len == -1)
len = lstrlenW(str);
while (len)
{
pos = str;
/* 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 < len && *pos == '\t') { /* handle tabs */
WCHAR tab = '\t';
if (pos!=str)
ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
ME_InternalInsertTextFromCursor(editor, nCursor, &tab, 1, style, MERF_TAB);
pos++;
if(pos-str <= len) {
len -= pos - str;
str = pos;
continue;
}
}
if (pos-str < len) { /* handle EOLs */
ME_DisplayItem *tp, *end_run;
ME_Style *tmp_style;
if (pos!=str)
ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
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);
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;
if(pos-str < len && *pos =='\r')
pos++;
if(pos-str < len && *pos =='\n')
pos++;
if(pos-str <= len) {
len -= pos - str;
str = pos;
continue;
}
}
ME_InternalInsertTextFromCursor(editor, nCursor, str, len, style, 0);
len = 0;
}
}
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));
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));
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)
{
/* 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 (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;
}
void
ME_SelectWord(ME_TextEditor *editor)
{
if (!(editor->pCursors[0].pRun->member.run.nFlags & MERF_ENDPARA))
ME_MoveCursorWords(editor, &editor->pCursors[0], -1);
ME_MoveCursorWords(editor, &editor->pCursors[1], +1);
ME_InvalidateSelection(editor);
ME_SendSelChange(editor);
}
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;
}
int 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;
int rx = 0;
if (is_eol)
*is_eol = 0;
while(p != editor->pBuffer->pLast)
{
if (p->type == diParagraph)
{
int ry = y - p->member.para.nYPos;
if (ry < 0)
{
result->pRun = ME_FindItemFwd(p, diRun);
result->nOffset = 0;
return 0;
}
if (ry >= p->member.para.nHeight)
{
p = p->member.para.next_para;
continue;
}
p = ME_FindItemFwd(p, diStartRow);
y = ry;
continue;
}
if (p->type == diStartRow)
{
int ry = y - p->member.row.nYPos;
if (ry < 0)
return 0;
if (ry >= p->member.row.nHeight)
{
p = ME_FindItemFwd(p, diStartRowOrParagraphOrEnd);
if (p->type != diStartRow)
return 0;
continue;
}
p = ME_FindItemFwd(p, diRun);
continue;
}
if (p->type == diRun)
{
ME_DisplayItem *pp;
rx = x - p->member.run.pt.x;
if (rx < 0)
rx = 0;
if (rx >= p->member.run.nWidth) /* not this run yet... find next item */
{
pp = p;
do {
p = p->next;
if (p->type == diRun)
{
rx = x - p->member.run.pt.x;
goto continue_search;
}
if (p->type == diStartRow)
{
p = ME_FindItemFwd(p, diRun);
if (is_eol)
*is_eol = 1;
rx = 0; /* FIXME not sure */
goto found_here;
}
if (p->type == diParagraph || p->type == diTextEnd)
{
rx = 0; /* FIXME not sure */
p = pp;
goto found_here;
}
} while(1);
continue;
}
found_here:
if (p->member.run.nFlags & MERF_ENDPARA)
rx = 0;
result->pRun = p;
result->nOffset = ME_CharFromPointCursor(editor, rx, &p->member.run);
if (editor->pCursors[0].nOffset == p->member.run.strText->nLen && rx)
{
result->pRun = ME_FindItemFwd(editor->pCursors[0].pRun, diRun);
result->nOffset = 0;
}
return 1;
}
assert(0);
continue_search:
;
}
result->pRun = ME_FindItemBack(p, diRun);
result->nOffset = 0;
assert(result->pRun->member.run.nFlags & MERF_ENDPARA);
return 0;
}
int
ME_CharFromPos(ME_TextEditor *editor, int x, int y)
{
ME_Cursor cursor;
RECT rc;
GetClientRect(editor->hWnd, &rc);
if (x < 0 || y < 0 || x >= rc.right || y >= rc.bottom)
return -1;
y += ME_GetYScrollPos(editor);
ME_FindPixelPos(editor, x, y, &cursor, NULL);
return (ME_GetParagraph(cursor.pRun)->member.para.nCharOfs
+ cursor.pRun->member.run.nCharOfs + cursor.nOffset);
}
void ME_LButtonDown(ME_TextEditor *editor, int x, int y)
{
ME_Cursor tmp_cursor;
int is_selection = 0;
editor->nUDArrowX = -1;
y += ME_GetYScrollPos(editor);
tmp_cursor = editor->pCursors[0];
is_selection = ME_IsSelection(editor);
ME_FindPixelPos(editor, x, y, &editor->pCursors[0], &editor->bCaretAtEnd);
if (GetKeyState(VK_SHIFT)>=0)
{
editor->pCursors[1] = editor->pCursors[0];
}
else
{
if (!is_selection) {
editor->pCursors[1] = tmp_cursor;
is_selection = 1;
}
}
ME_InvalidateSelection(editor);
HideCaret(editor->hWnd);
ME_MoveCaret(editor);
ShowCaret(editor->hWnd);
ME_ClearTempStyle(editor);
ME_SendSelChange(editor);
}
void ME_MouseMove(ME_TextEditor *editor, int x, int y)
{
ME_Cursor tmp_cursor;
y += ME_GetYScrollPos(editor);
tmp_cursor = editor->pCursors[0];
if (!ME_FindPixelPos(editor, x, y, &tmp_cursor, &editor->bCaretAtEnd))
/* return */;
if (tmp_cursor.pRun == editor->pCursors[0].pRun &&
tmp_cursor.nOffset == editor->pCursors[0].nOffset)
return;
ME_InvalidateSelection(editor);
editor->pCursors[0] = tmp_cursor;
HideCaret(editor->hWnd);
ME_MoveCaret(editor);
ME_InvalidateSelection(editor);
ShowCaret(editor->hWnd);
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;
*pbCaretAtEnd = FALSE;
do {
int run_x = pNext->member.run.pt.x;
int width = pNext->member.run.nWidth;
if (x < run_x)
{
if (pOffset) *pOffset = 0;
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 = 1;
if (pOffset) *pOffset = 0;
return pNext;
} else {
if (pbCaretAtEnd) *pbCaretAtEnd = 0;
if (pOffset) *pOffset = 0;
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;
int x = ME_GetXForArrow(editor, pCursor);
if (editor->bCaretAtEnd && !pCursor->nOffset)
pRun = ME_FindItemBack(pRun, diRun);
if (!pRun)
return;
if (nRelOfs == -1)
{
/* start of this row */
pItem = ME_FindItemBack(pRun, diStartRow);
assert(pItem);
/* start of the previous row */
pItem = ME_FindItemBack(pItem, diStartRow);
}
else
{
/* start of the next row */
pItem = ME_FindItemFwd(pRun, diStartRow);
/* FIXME If diParagraph is before diStartRow, wrap the next paragraph?
*/
}
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 *pRun = pCursor->pRun;
ME_DisplayItem *pLast, *p;
int x, y, ys, yd, yp, yprev;
ME_Cursor tmp_curs = *pCursor;
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.nYPos;
yprev = ys = y = yp + p->member.row.nYPos;
yd = y - editor->sizeWindow.cy;
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.nYPos;
continue;
}
y = yp + p->member.row.nYPos;
if (y < yd)
break;
pLast = p;
yprev = y;
} while(1);
pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset, &editor->bCaretAtEnd);
ME_UpdateSelection(editor, &tmp_curs);
if (yprev < editor->sizeWindow.cy)
{
ME_EnsureVisible(editor, ME_FindItemFwd(editor->pBuffer->pFirst, diRun));
ME_Repaint(editor);
}
else {
ME_Scroll(editor, 0, ys-yprev);
ME_Repaint(editor);
}
assert(pCursor->pRun);
assert(pCursor->pRun->type == diRun);
}
/* FIXME: in the original RICHEDIT, PageDown always scrolls by the same amount
of pixels, even if it makes the scroll bar position exceed its normal maximum.
In such a situation, clicking the scrollbar restores its position back to the
normal range (ie. sets it to (doclength-screenheight)). */
static void ME_ArrowPageDown(ME_TextEditor *editor, ME_Cursor *pCursor)
{
ME_DisplayItem *pRun = pCursor->pRun;
ME_DisplayItem *pLast, *p;
int x, y, ys, yd, yp, yprev;
ME_Cursor tmp_curs = *pCursor;
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.nYPos;
yprev = ys = y = yp + p->member.row.nYPos;
yd = y + editor->sizeWindow.cy;
pLast = p;
do {
p = ME_FindItemFwd(p, diStartRowOrParagraph);
if (!p)
break;
if (p->type == diParagraph) {
yp = p->member.para.nYPos;
continue;
}
y = yp + p->member.row.nYPos;
if (y >= yd)
break;
pLast = p;
yprev = y;
} while(1);
pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset, &editor->bCaretAtEnd);
ME_UpdateSelection(editor, &tmp_curs);
if (yprev >= editor->nTotalLength-editor->sizeWindow.cy)
{
ME_EnsureVisible(editor, ME_FindItemBack(editor->pBuffer->pLast, diRun));
ME_Repaint(editor);
}
else {
ME_Scroll(editor, 0, ys-yprev);
ME_Repaint(editor);
}
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;
}
BOOL ME_UpdateSelection(ME_TextEditor *editor, ME_Cursor *pTempCursor)
{
ME_Cursor old_anchor = editor->pCursors[1];
if (GetKeyState(VK_SHIFT)>=0) /* cancelling selection */
{
/* any selection was present ? if so, it's no more, repaint ! */
editor->pCursors[1] = editor->pCursors[0];
if (memcmp(pTempCursor, &old_anchor, sizeof(ME_Cursor))) {
return TRUE;
}
return FALSE;
}
else
{
if (!memcmp(pTempCursor, &editor->pCursors[1], sizeof(ME_Cursor))) /* starting selection */
{
editor->pCursors[1] = *pTempCursor;
return TRUE;
}
}
ME_Repaint(editor);
return TRUE;
}
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)
{
ME_Style *style;
int from, to;
ME_Cursor c;
ME_GetSelection(editor, &from, &to);
ME_CursorFromCharOfs(editor, from, &c);
if (from != to) {
style = c.pRun->member.run.style;
ME_AddRefStyle(style); /* ME_GetInsertStyle has already done that */
}
else
style = ME_GetInsertStyle(editor, 0);
return style;
}
void ME_SendSelChange(ME_TextEditor *editor)
{
SELCHANGE sc;
ME_ClearTempStyle(editor);
if (!(editor->nEventMask & ENM_SELCHANGE))
return;
sc.nmhdr.hwndFrom = editor->hWnd;
sc.nmhdr.idFrom = GetWindowLongW(editor->hWnd, GWLP_ID);
sc.nmhdr.code = EN_SELCHANGE;
SendMessageW(editor->hWnd, EM_EXGETSEL, 0, (LPARAM)&sc.chrg);
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;
SendMessageW(GetParent(editor->hWnd), WM_NOTIFY, sc.nmhdr.idFrom, (LPARAM)&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;
if (ME_IsSelection(editor) && !extend)
ME_InvalidateSelection(editor);
editor->nUDArrowX = -1;
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;
if (ME_IsSelection(editor))
ME_InvalidateSelection(editor);
HideCaret(editor->hWnd);
ME_EnsureVisible(editor, tmp_curs.pRun);
ME_ShowCaret(editor);
ME_SendSelChange(editor);
return success;
}
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