Subj : WM_PAINT or TWindow::Paint
To   : borland.public.cpp.borlandcpp
From : MarvinAvery
Date : Mon Aug 08 2005 06:36 pm

Hi.

I am using BC5.02 and OWLNext.

I have a window in which I am displaying lines of text with a fixed-pitch
font.
This window can be scrolled horizontally. To do this, I call:

    ScrollWindowEx (dx, 0, &rect, &rect, 0, 0, SW_INVALIDATE|SW_ERASE);
    UpdateWindow();

UpdateWindow() causes a WM_PAINT message to be generated. In my
TMyWindow::Paint() routine, I pant a line as follows:

   dc.TextOut (x_pos, y_pos, line_of_text);

Now, if I scroll 1 column to the left (dx = width of 1 character in screen
units), Windows physically scrolls my window one column left and, because I
use UpdateWindow(),  Windows "marks" only the right-most column for
painting. Thus, when calling dc.TextOut() even though I am writing the
entire line, only the last character actually gets written (or painted).

Now for my question.......

Is there a way of telling or forcing Windows, for specific lines only, to
actually paint the *entire* line?

TIA
Marvin Avery

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