AIX Version 4.3 Differences Guide
AIX Version 4.3 Differences Guide
AIX Version 4.3 Differences Guide
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A set of resources was added to enable control of the color schemes by the<br />
application. The goal of these new resources makes it possible for an application<br />
to:<br />
• Override the color calculation method used by Motif to generate 3D effects.<br />
• Allocate the pixels in the colormap.<br />
Color-intensive applications generally want to control the color schema and color<br />
allocation to optimize their own algorithms and use of the colormap. For example,<br />
on a system with 256 entries in the colormap, an application may want to reserve<br />
all 256 colors for its own usage. There are then no colors left for the Motif toolkit.<br />
With Motif 2.1, the application can plug-in its own allocation function. Then, each<br />
time Motif needs a new color, it calls that function. The application can then loan<br />
to Motif one of the colors it is already using.<br />
A new screen resource allows an application to customize the bitmap that is used<br />
by Motif for the rendering of insensitive visuals. Support is also added for<br />
applications that want to display menus in overlay planes. Menus can now be<br />
displayed in a visual that is different than that of the application.<br />
8.3.4.12 Virtual Bindings<br />
As of Motif 1.2, users can customize the keyboard mapping by defining a keymap<br />
between virtual keys (for example, osfCancel) and real keys (for example, Cancel<br />
or Escape). They then run the xmbind command to bind the real keys to the virtual<br />
keys. However, a single real key can only be assigned to a single virtual key.<br />
In Motif 2.1, each virtual key can be associated with multiple real keys, allowing<br />
users to use, for example, both the Escape key or the Cancel key to cancel an<br />
operation. Of course, errors can occur if a user incorrectly maps the same real<br />
key to multiple virtual keys.<br />
8.3.4.13 Drag and Drop Enhancements<br />
Several enhancements have been made to Drag and Drop. The following<br />
features are useful for sophisticated applications that are advanced in drag and<br />
drop technology.<br />
A function has been added to query if a widget is a dropsite or not. A generic<br />
application-wide dragStartCallback has been added, so an application can be<br />
aware and take action for any drag occurring at any time in the application.<br />
To provide better drag and drop feedback to the user, Motif 2.1 makes it possible<br />
for the drag icon to change in real time to show the effect that a drop would have<br />
if it occurred at the current location of the mouse cursor. The effect depends on<br />
the individual item, or items, that are being dragged.<br />
Another enhancement that has no API, but is fairly visible to end users, is<br />
drag-scroll support. Users of small screens are often faced with the problem of<br />
not being able to drag data from one place and drop it in another because the<br />
target window is currently scrolled out of view. The user has to drop the icon on<br />
the desktop, scroll the window so that the destination is visible, and restart the<br />
drag. Drag scrolling prevents this, allowing the user to move the cursor over the<br />
scroll bar direction control and pause. After a customizable delay, the scrollable<br />
window automatically begins to scroll and makes the destination appear. As soon<br />
as the user moves the cursor, scrolling stops.<br />
Graphical Environment Enhancements 223
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