Example of ME_TextBuffer representation in rich edit control in Wine.

by Thomas Kho <tkho@ucla.edu>
2006-01-30

ME_TextBuffer points into a doubly-linked list of ME_DisplayItem. An
ME_DisplayItem is either a paragraph, row, or run [think of ME_DisplayItem as a
superclass]. It is more intuitive to view the linked list as a tree:

|---Paragraph1
| |---Row1
| | |---Run1
| | |---Run2
| |
| |---Row2
| | |---Run1
| | |---Run2
|
|---Paragraph2
| |---Row1
| | |---Run1
| | |---Run2

Sending the following message to set the contents of the rich edit control:
SendMessage(hwndRichEdit, WM_SETTEXT, 0, (LPARAM) "a\nthis is a very long line of text that should be longer than one screen-width\nc\nd\ne");

We get the following output from ME_DocumentDump():
trace:richedit_lists:ME_DumpDocument DOCUMENT DUMP START
trace:richedit_lists:ME_DumpDocument Start
trace:richedit_lists:ME_DumpDocument Paragraph(ofs=0)
trace:richedit_lists:ME_DumpDocument  - StartRow
trace:richedit_lists:ME_DumpDocument  - Run("L"a"", 0)
trace:richedit_lists:ME_DumpDocument  - Run("L"\00b6"", 1)
trace:richedit_lists:ME_DumpDocument Paragraph(ofs=2)
trace:richedit_lists:ME_DumpDocument  - StartRow
trace:richedit_lists:ME_DumpDocument  - Run("L"this is a very long line of text"", 0)
trace:richedit_lists:ME_DumpDocument  - Run("L" "", 32)
trace:richedit_lists:ME_DumpDocument  - StartRow
trace:richedit_lists:ME_DumpDocument  - Run("L"that should be longer than one"", 33)
trace:richedit_lists:ME_DumpDocument  - Run("L" "", 63)
trace:richedit_lists:ME_DumpDocument  - StartRow
trace:richedit_lists:ME_DumpDocument  - Run("L"screen-width"", 64)
trace:richedit_lists:ME_DumpDocument  - Run("L"\00b6"", 76)
trace:richedit_lists:ME_DumpDocument Paragraph(ofs=79)
trace:richedit_lists:ME_DumpDocument  - StartRow
trace:richedit_lists:ME_DumpDocument  - Run("L"c"", 0)
trace:richedit_lists:ME_DumpDocument  - Run("L"\00b6"", 1)
trace:richedit_lists:ME_DumpDocument Paragraph(ofs=81)
trace:richedit_lists:ME_DumpDocument  - StartRow
trace:richedit_lists:ME_DumpDocument  - Run("L"d"", 0)
trace:richedit_lists:ME_DumpDocument  - Run("L"\00b6"", 1)
trace:richedit_lists:ME_DumpDocument Paragraph(ofs=83)
trace:richedit_lists:ME_DumpDocument  - StartRow
trace:richedit_lists:ME_DumpDocument  - Run("L"e"", 0)
trace:richedit_lists:ME_DumpDocument  - Run("L"\00b6"", 1)
trace:richedit_lists:ME_DumpDocument End(ofs=85)
trace:richedit_lists:ME_DumpDocument DOCUMENT DUMP END