This assumes that you know the right places. Would have been to make a subroutine that did the enabling and call it from the Of course, you might think 'The obviously correct thing to do Maintaining code like this is a nightmare. The state changed so the enabling condition changed did not bother to do theĬomputations at all. In addition, at least two other places where And the order in which they wereĮxecuted produced very odd results. Separate algorithms for determining enabling. In question, and not every site got updated consistently. (such as adding a new control) created a new condition for enabling the control As usual, this led to the case where each change I inherited (I'm a freelance consultant). Why is this the wrong place? Well, a good example is a piece of code Like, in the code that responds to the event. Newcomer) show dialogs asĮnabling controls in response to button presses, ListBox selections, and the

Programming, by Brent Rector and Joseph M. The usual examples given in introductory textbooks (with one But the importantįeature of both these techniques is that the control manipulation code exists In my solution, all the code is in one function. ON_UPDATE_COMMAND_UI handler, and the code to enable the control goes in that Only difference between the technique I'm about to describe and the technique heĭescribes is how the code is partitioned. WM_KICKIDLE and looking at the C++ Q&A columns that come up. It appears on the MSDN CD-ROM find it by searching for Unfortunately, I've tried this a couple times and could not That suggests a technique for causing ON_UPDATE_COMMAND_UI messages to be Paul DiLascia has published a technique in his C++ Q&A column Has allowed me to develop a methodology for handling this. The simple methods illustrated in the introductory textbooks areĬonsiderably less than adequate in this case. Real world, dialog boxes are usually fairly complex, and the enabling conditionsĪre nontrivial. Simple methods are easy to write and easy to maintain.

That's because most of them illustrate fairly simple examples, where the Most books that show examples of how to do it get it Unlike windows, there is no ON_UPDATE_COMMAND_UI Have certain controls enabled or disabled, visible or invisible, based on the Dialog box control management is a perpetual problem.

Getwindowtext example mfc c++