/******************************************************************************
* ME_SplitRunSimple
*
* Does the most basic job of splitting a run into two - it does not
* update the positions and extents.
*/
ME_DisplayItem *ME_SplitRunSimple(ME_TextEditor *editor, ME_Cursor *cursor)
{
ME_DisplayItem *run = cursor->pRun;
ME_DisplayItem *new_run;
int i;
int nOffset = cursor->nOffset;
assert(!(run->member.run.nFlags & MERF_NONTEXT));
new_run = ME_MakeRun(run->member.run.style,
run->member.run.nFlags & MERF_SPLITMASK);
new_run->member.run.nCharOfs = run->member.run.nCharOfs + nOffset;
new_run->member.run.len = run->member.run.len - nOffset;
new_run->member.run.para = run->member.run.para;
run->member.run.len = nOffset;
cursor->pRun = new_run;
cursor->nOffset = 0;
ME_InsertBefore(run->next, new_run);
ME_UpdateRunFlags(editor, &run->member.run);
ME_UpdateRunFlags(editor, &new_run->member.run);
for (i = 0; i < editor->nCursors; i++) {
if (editor->pCursors[i].pRun == run &&
editor->pCursors[i].nOffset >= nOffset) {
editor->pCursors[i].pRun = new_run;
editor->pCursors[i].nOffset -= nOffset;
}
}
cursor->pPara->member.para.nFlags |= MEPF_REWRAP;
return run;
}
/******************************************************************************
* ME_JoinRuns
*
* Merges two adjacent runs, the one given as a parameter and the next one.
*/
void ME_JoinRuns(ME_TextEditor *editor, ME_DisplayItem *p)
{
ME_DisplayItem *pNext = p->next;
int i;
assert(p->type == diRun && pNext->type == diRun);
assert(p->member.run.nCharOfs != -1);
ME_GetParagraph(p)->member.para.nFlags |= MEPF_REWRAP;
/* Update all cursors so that they don't contain the soon deleted run */
for (i=0; i<editor->nCursors; i++) {
if (editor->pCursors[i].pRun == pNext) {
editor->pCursors[i].pRun = p;
editor->pCursors[i].nOffset += p->member.run.len;
}
}
p->member.run.len += pNext->member.run.len;
ME_Remove(pNext);
ME_DestroyDisplayItem(pNext);
ME_UpdateRunFlags(editor, &p->member.run);
if(TRACE_ON(richedit))
{
TRACE("Before check after join\n");
ME_CheckCharOffsets(editor);
TRACE("After check after join\n");
}
}
static void ME_WrapSizeRun(ME_WrapContext *wc, ME_DisplayItem *p)
{
/* FIXME compose style (out of character and paragraph styles) here */
ME_UpdateRunFlags(wc->context->editor, &p->member.run);
calc_run_extent(wc->context, &wc->pPara->member.para,
wc->nRow ? wc->nLeftMargin : wc->nFirstMargin, &p->member.run);
}
static ME_DisplayItem *ME_SplitByBacktracking(ME_WrapContext *wc, ME_DisplayItem *p, int loc)
{
ME_DisplayItem *piter = p, *pp;
int i, idesp, len;
ME_Run *run = &p->member.run;
idesp = i = find_split_point( wc->context, loc, run );
len = run->len;
assert(len>0);
assert(i<len);
if (i) {
/* don't split words */
i = reverse_find_whitespace( get_text( run, 0 ), i );
pp = ME_MaximizeSplit(wc, p, i);
if (pp)
return pp;
}
TRACE("Must backtrack to split at: %s\n", debugstr_run( &p->member.run ));
if (wc->pLastSplittableRun)
{
if (wc->pLastSplittableRun->member.run.nFlags & (MERF_GRAPHICS|MERF_TAB))
{
wc->pt = wc->pLastSplittableRun->member.run.pt;
return wc->pLastSplittableRun;
}
else if (wc->pLastSplittableRun->member.run.nFlags & MERF_SPLITTABLE)
{
/* the following two lines are just to check if we forgot to call UpdateRunFlags earlier,
they serve no other purpose */
ME_UpdateRunFlags(wc->context->editor, run);
assert((wc->pLastSplittableRun->member.run.nFlags & MERF_SPLITTABLE));
piter = wc->pLastSplittableRun;
run = &piter->member.run;
len = run->len;
/* don't split words */
i = reverse_find_whitespace( get_text( run, 0 ), len );
if (i == len)
i = reverse_find_non_whitespace( get_text( run, 0 ), len );
if (i) {
ME_DisplayItem *piter2 = split_run_extents(wc, piter, i);
wc->pt = piter2->member.run.pt;
return piter2;
}
/* splittable = must have whitespaces */
assert(0 == "Splittable, but no whitespaces");
}
else
{
/* restart from the first run beginning with spaces */
wc->pt = wc->pLastSplittableRun->member.run.pt;
return wc->pLastSplittableRun;
}
}
TRACE("Backtracking failed, trying desperate: %s\n", debugstr_run( &p->member.run ));
/* OK, no better idea, so assume we MAY split words if we can split at all*/
if (idesp)
return split_run_extents(wc, piter, idesp);
else
if (wc->pRowStart && piter != wc->pRowStart)
{
/* don't need to break current run, because it's possible to split
before this run */
wc->bOverflown = TRUE;
return piter;
}
else
{
/* split point inside first character - no choice but split after that char */
if (len != 1) {
/* the run is more than 1 char, so we may split */
return split_run_extents(wc, piter, 1);
}
/* the run is one char, can't split it */
return piter;
}
}