| | 1 | = Gtk Simple Window = |
| | 2 | |
| | 3 | The simplest Gtk program displays a window which closes when told to. |
| | 4 | |
| | 5 | [[Image(window.png)]] |
| | 6 | |
| | 7 | The following program is in two parts: |
| | 8 | |
| | 9 | a. The class `MyWindow` will be the main window for the application. `MyWindow` inherits from the Gtk `Window` class, and the `init` method initialises its parent with the given title. |
| | 10 | * `.setDefaultSize` is called to create a sensible size for the window |
| | 11 | * `listen` is used to attach a method to the `deleteEvent`, called when the user clicks the close window button. |
| | 12 | |
| | 13 | b. The `main` method in `MainProgram` goes through four stages to create and display a Gtk application: |
| | 14 | 1. start the graphical application |
| | 15 | 2. create an instance of the main window |
| | 16 | 3. request all widgets in the main window to show themselves |
| | 17 | 4. finally, run the graphical application |
| | 18 | |
| | 19 | {{{ |
| | 20 | #!cobra |
| | 21 | # @args -pkg:gtk-sharp-2.0 # remove initial '#' |
| | 22 | |
| | 23 | use Gtk |
| | 24 | |
| | 25 | class MyWindow inherits Window |
| | 26 | |
| | 27 | def onDeleteEvent(obj, args as DeleteEventArgs) |
| | 28 | """ |
| | 29 | This method is tied to the deleteEvent, and is called when the close |
| | 30 | button is clicked. It causes the application to quit. |
| | 31 | """ |
| | 32 | Application.quit |
| | 33 | |
| | 34 | cue init(title as String) |
| | 35 | # pass the title to the parent window |
| | 36 | base.init(title) |
| | 37 | # set a size for our window |
| | 38 | .setDefaultSize(300, 200) |
| | 39 | # register method to handle the close event |
| | 40 | listen .deleteEvent, ref .onDeleteEvent |
| | 41 | |
| | 42 | class MainProgram |
| | 43 | def main |
| | 44 | # initialise the application |
| | 45 | Application.init |
| | 46 | # create an instance of our main window |
| | 47 | window = MyWindow("Cobra's First Window") |
| | 48 | # show all the widgets within the window |
| | 49 | window.showAll |
| | 50 | # start running the application |
| | 51 | Application.run |
| | 52 | }}} |
