On 14 Jun 2009, at 00:22, Frank-Guido Dibowski wrote:
I want to manage for example a QL-Screen picture (512x256) or a text-
file on a
application subwindow (200x100) with pan and scroll bars (like
QDesign or QD
(Sorry Jochen, not with QMenu ;-)) but i don't know how.
I work with EasyPtr4, C68 and a little bit assembler.
Can everybody help me?
Application Windows
Pan and scroll bars can be produced as part of an "application window"
by the use of the PE software window manager vectors WM.INDEX and
WM.MDRAW. If SETW is used to produce a window definition (for
TurboPTR, CPTR and EayPEasy) containing an application window with
items, scroll bars and arrows are automatically produced when the
working definition is set up if the application window is too small to
show all the items.
Sometimes you may want to set items to an application window after the
program has started. An example is showing the directory of FLP1. In
this case TurboPTR has the function "set_ap" which does this, with
scroll bars and arrows if needed. The same can be done in assembler
using EasyPEasy which provides the subroutine "set_ap". The example
EX2 is available in TurboPTR and EasyPEasy. This shows in detail how
it works.
QD Type Scrolling
The movement of text in QD can be done by using the vertical scroll
bar. There are no arrows. I have done this in my programs by using
the Trap IO.RPTR to read the pointer instead of the vector WM.RPTR. I
detect when the left mouse key is pressed when the pointer is inside a
scroll bar. I make the icon invisible until the key is lifted and move
the scroll bar as the mouse is moved. The way this is done is shown in
the example EX4 in TurboPTR and in EasyPEasy.
One problem with using IOP.RPTR instead of WM.RPTR is that you have to
program for the detection of loose items both to draw and undraw
borders round them when the pointer is on them or has moved away from
them and also to activate the loose items when the mouse key is clicked.
In CPTR, the example EX2 shows text being displayed with scroll bars
when the window is too small.
George
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