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.
The ME_RunOfsFromCharOfs function finds the paragraph before finding the
run and offset within the run, so the function may as well be able to
return this paragraph to the caller. Many callers to the function
instead find the paragraph from the run, which ends up unnecessarily
traversing a linked list of runs within the paragraph.
Whenever ME_InitContext is called, ME_DestroyContext should be used to
clean it up. This way the context can be extended easily by modifying
those two functions. Instead, these two places of code just released
the DC, without using ME_DestroyContext, so the created brush for the
margin was not deleted.
Previously a count of the carraige returns and line feeds were stored
for end of paragraph runs, and a paragraph sign was stored as the actual
string. This was causing many special cases where the length of the
run needed to be determined differently if the run was or wasn't an
end of paragraph run.
There wasn't any use for storing the paragraph sign unless some drawing
code gets commented out to allow the end paragraphs to be shown,
therefore I changed the code to store the actual string that gets
retrieved by WM_GETTEXT.
The two functions ME_FindItemAtOffset and ME_RunOfsFromCharOfs were almost
identically used, since ME_FindItemAtOffset was always used to find a run.
The only difference was how they returned the offset within the run for an
end of paragraph run.
For ME_FindItemAtOffset it would return the next run if it was in between \r
and \n. ME_RunOfsFromCharOfs would instead return an nOffset of 0 for end
paragraph runs. This subtle difference introduced bugs, so I decided to
avoid having special case in this function when creating this patch, and
instead let the caller handle this case.
The methods in ITextHost are mostly thin wrappers around functions that
take a handle to a window as their first parameter. This patch just
uses the wrapper functions provided by ITextHost instead of using the
functions that require a handle to a window that the editor might now
have (for windowless richedit controls).
The formatting rectangle is set with EM_SETRECT, and retrieved with
EM_GETRECT, so it corresponds to rcFormat in the code. This defines the
area that the richedit control should draw the text so that it is
offset by the top-left corner of the formatting rectangle, and clipped
so that it doesn't draw past the bottom or right hand side. Thus this
is important for implementing windowless richedit controls to not
interfere with the rest of the window.
This also reverts commit 2b52dd845097f16076c0185b02a003f63898dcab:
wordpad: Empty the richedit undo buffer on creation.
The reverted commit I created to fix an issue that only applied to Wine,
but it just masked the issue which was in richedit controls. The
default character format was set in two places while wordpad was
starting up, and caused wordpad to have two undo items at startup.
The bCaretAtEnd value in ME_TextEditor is used to identify that the
caret is at the end of a wrapped line instead of the start of the next
line in the paragraph since both these positions correspond to the
same position in the document. The bCaretAtEnd value was previously
being set back to FALSE whenever the window was resized.
Optimized reading large texts into RichEdit to be an O(n) order
algorythm instead of O(n^2) by removing extraneous conversions of
character offsets to run offsets.
should greatly improve stability of the wrap code and eliminate
regressions of the most recent versions)
- completely new scrollbar handling (much more reliable) and related
redraw fixes
- Page Down handler (no Page Up yet, fixing wrap/redraw/scrollbar bugs
was of higher priority)
unnecessary repaints)
- added unicode character support to RTF import (like: \u12345 ?)
- small fixes
- fixed whitespace identification bug
- removed drawing of paragraph marks
- improved stub implementations for IRichEditOle
multiple undo actions in one EM_STREAMIN).
- Related changes to undo code (umIgnore mode is now handled
correctly).
- Numerous improvements in the RTF reader: it reads some character
attributes now (you will have proper small print in license agreements
now).
- Fixed a memory overwrite bug in conversion from CHARFORMAT2A to
CHARFORMAT2W.
- ME_JoinRuns didn't mark the paragraph for rewrapping, fixed.
- Removed PostQuitMessage(0) from WM_DESTROY handler (duh!).
- Use of EM_GETOLEINTERFACE is reported with FIXME instead of TRACE
(any app using this message is likely to encounter major problems).
Dylan Smith