Gambas/FAQ

Back to Gambas See http://sourceforge.net/mailarchive/forum.php?forum=gambas-user Hotkeys If you want to use some hotkeys for a project, you might code something like this: Public sub Form_KeyPress () If key.code = ... then Something happens Unfortunately this only works, if the form has no buttons and other controls. If the form has other controls and one of the controls has the focus, then it does not work. There is no interface in the QT component to globally intercept key events yet, but there is a trick: If you have a menu in your form, its keyboard shortcuts are globally managed. So you can add an hidden menu to your form to solve your problem. KDE panel applet ? Is it possible to write a KDE panel applet with Gambas? No, currently it is not possible to do that. KDE panel applets are implemented as shared libraries with specific interfaces. Listview How can I add a listview item after an existing one, when there is an item missing: Wrong: Listview.add("Key","Name",,"Key2") -- Error: Comma missing. You have to pass NULL as picture argument. You cannot "jump" arguments when you call a function in Gambas. Listview.add("Key","Name",NULL,"Key2") Variables Does Gambas support structured data types? In some versions of basic, it is possible to create structured data types using by using type definitions as follows: ' This will not work in Gambas TYPE rhubarbstructure foo AS STRING * 32 bar AS INTEGER END TYPE PUBLIC rhubarb AS rhubarbstructure Currently, Gambas does not support the TYPE keyword. Instead, you can use the STRUCT or STRUCT[] keywords. Additionally, it is possible to use class definitions for the same effect. Project Building Does gambas support include files? Does gambas support conditional compilation directives? Application Startup Making the application startup from a main routine In gambas, to make an application startup from a main routine: Create a new module called MMain In the MMain module, create a public sub called Main as follows: PUBLIC SUB Main() ' This is the start of the program END Right click the MMain module, then select Startup class from the context menu Obtaining the command line parameters PUBLIC SUB main() ' This reads and displays the command line parameters DIM l AS Integer DIM numparms AS Integer DIM parm AS String numparms = Application.Args.Count FOR l = 0 TO numparms - 1 parm = Application.Args[l] PRINT l; " : "; parm NEXT END SUB Window Geometry Determining the maximum window size Overview In gambas, the trick to determining the maximum window size that will fit on the screen is to create a form that is maximized and then query its dimensions from within a Form_Resize() event. Note that the form can be invisible during this process, and typically we would use the main modal window (FMain in this example). Creating the form From with the project create a form (FMain) with the following properties set: FMain.Maximized = True FMain.Visible = False ' The form can be invisible From within the project view, rightclick the FMain form and select Edit class from the contextmenu. This will display a form class file (FMain.class) as follows: PUBLIC SUB _new() END PUBLIC SUB Form_Open() END We can now add a Form_Resize() event to the class file with the necessary code to obtain the screen dimensions as follows: PUBLIC SUB Form_Resize() PRINT "The maximum window size that can be used is "; FMain.Width; " x "; FMain.Height END