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Volume 6A: Motif Programming Manual
book

Volume 6A: Motif Programming Manual

by David Brennan, Dan Heller, Paula Ferguson
September 1993
Intermediate to advanced content levelIntermediate to advanced
1014 pages
28h 26m
English
O'Reilly Media, Inc.
Content preview from Volume 6A: Motif Programming Manual
cell_height; /* When the user resizes the frame bigger, expose events are generated, * so that's not a problem, since
the expose handler will repaint the * whole viewport. However, when the window resizes smaller, no * expose event
is generated. The window does not need to be * redisplayed if the old viewport was smaller than the pixmap. * (The
existing image is still valid−−no redisplay is necessary.) * The window WILL need to be redisplayed if: * 1) new view
size is larger than pixmap (pixmap needs to be centered). * 2) new view size is smaller than pixmap, but the OLD
view size was * larger than pixmap. */ if ((int) new_height >= rows) { /* The height of the viewport is taller than the
pixmap, so set * pix_voffset = 0, so the top origin of the pixmap is shown, * and the pixmap is centered vertically in
viewport. */ pix_voffset = 0; sw_voffset = (view_height − rows * cell_height)/2; /* Case 1 above */ do_clear = True;
/* scrollbar is maximum size */ new_height = rows; } else { /* Pixmap is larger than viewport, so viewport will be
completely * redrawn on the redisplay. (So, we don't need to clear window.) * Make sure upper side has origin of a
cell (bitmap). */ pix_voffset = min (pix_voffset, (rows−new_height) * cell_height); sw_voffset = 0; /* no centering is
done */ /* Case 2 above */ if (oldh > rows * cell_height) do_clear = True; } XtVaSetValues (vsb, XmNsliderSize,
max (new_height, 1), XmNvalue, pix_voffset / cell_height, XmNpageIncrement, max (new_height−1, 1), NULL); /*
identical ...
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Publisher Resources

ISBN: 9780596000431