> My project shows that there are open and close events > for a pushbutton. Why would a pushbutton have these events? > How does a pushbutton open or close? Shouldn't code for these > events be placed in the form opening or closing events?
I'm sure someone can answer this better than I can, but here goes... Reasons you might place something in the Window Open event: There might be times where you need to initialize certain things when the window opens. Filling arrays that will be accessed from different places within the application might be one example. Positioning the window might be another. Positioning and sizing controls that are on the window might be another, especially if you are coding cross platform, or if you are moving items off the window so that they cannont be seen (you should probably use the "Visible" property for this). For me, it generally seems to make sense to place these items in the Window Open event. Reading preference information might also be another... Reasons to place something in a control Open event: Again, for me, it's a matter of what is logical for me in a given situation. I might place code here if the code pertains only to this control or if it isn't something repetitive like moving the item into a position. Imagine placing positioning code in the Open events of 50 controls. Keep in mind that there are also timing issues. The Open events don't fire at the same time. There are times when you might need something to fire before something else. This sort situation can cause issues because the order of events can be different depending on which OS you are running your application. For me, it's simply a matter of what is logical and/or convenient for me. The Language Reference: >From the Language Reference (RB5.5.5), under Control, Events: Close -- The Window is about to close. Open -- The window is about to close. Under Methods you will see that there is no Open method, yet there is a Close method. Calling PushButton.Close will close the PushButton. Since there is no Open method, you cannot "Open" the PushButton control by coding PushButton1.Open. > I cannot find an application startup property in online > help that positions the default window on the screen. > How is startup position accomplished? The 'startup' property is the Open event of the window. This is where you would more than likely want to place you positioning code. You can also place position code in the App Open event, though I rarely find a need to place this sort of code in the App. Open event of Window1: Me.Left = 250 Me.Top = 180 Open event of App: Window1.Left = 250 Window1.Top = 180 >From the Action event of a PushButton control on the window (self is a refeence to the control's parent): Self.Left = 250 Self.Top = 180 HTH and hope I didn't share too many falsehoods. I'm sure someone will point them out if I have :) _______________________________________________ Unsubscribe or switch delivery mode: <http://www.realsoftware.com/support/listmanager/> Search the archives of this list here: <http://support.realsoftware.com/listarchives/lists.html>
