When you start a new desktop project in Xojo you get a few items by default. <\/p>\n\n\n\n
One of the is a Window – often named Window1.<\/p>\n\n\n\n
And it has a certain set of default properties. One of these causes a LOT of confusion and grief. You end up with issues like Window opening unexpectedly<\/a>, Mac Window Size Keep Changing<\/a> and Enumerations act private when they are not<\/a><\/p>\n\n\n\n While at first implicit instance makes life simple once you get very far with Xojo it becomes a liability. It can be come an impediment to writing code.<\/p>\n\n\n\n And the reason is that just by using the name of the window you actually run a method that will, if one doesnt already exist, create a new instance of the window. And this can block you from being able to access some things that are defined on that window.<\/p>\n\n\n\n Enumerations are one that it definitely causes issues with. There may be others as I havent tested everything.<\/p>\n\n\n\n So, if you dont use implicit instance what DO you use ?<\/p>\n\n\n\n To create a new instance you use NEW. Just like you do with any other class. <\/p>\n\n\n\n And if you dont want to create one IF one already exists then you can actually see if any other windows that are open ARE a Window1 and use that one.<\/p>\n\n\n\n Implicit instance saves you writing about 10 lines of code. And causes even long time users no end of problems. In fact I know some users that have gone so far as to define their own templates<\/a> for projects and have set the default Window1 to not have implicit instance on. But that only affects that first windows and any others inserted will still have it enabled.<\/p>\n\n\n\n You can turn it off for ALL of the new ones you add to a projects by altering the default values for certain properties using the Overrides system<\/a>. This makes it possible for you to make it so NO new windows added have implicit instance turned on.<\/p>\n\n\n\n <\/p>\n","protected":false},"excerpt":{"rendered":" When you start a new desktop project in Xojo you get a few items by default. One of the is a Window – often named Window1. And it has a certain set of default properties. One of these causes a LOT of confusion and grief. You end up with issues like Window opening unexpectedly, Mac … <\/p>\n