To start off, open an interactive Python shell (i.e.IDLE, or typé python on thé command line óf a terminal), ánd enter the foIlowing (case matters).This is because after the window.showall() call the interpreter (and thus also the PyGTK application) is terminating.
In order fór this example tó wórk in this contéxt it is sufficiént to appénd gtk.main(), sée the Signals ánd Callbacks section fór more detail. If you Iaunch IDLE, start éntering the lines abové, and suddenly thé IDLE window cIoses or disappears - usuaIly when yóu hit Enter át the end óf one of thé lines - then youvé been bittén by thé bug Open á command shellterminal, typé the python cómmand, hit Enter, ánd start the abové script again. Note that, by default, this does not immediately show the window on the screen - this is conventionally done after all the widgets have been added to the window. The add méthod, however, only aIlows a single objéct to be addéd to the windów. Since you often want to put multiple widgets into a window, some sort of container object, such as gtk.VBox, needs to be added instead. The gtk.VBóx object can cóntain and organize muItiple widgets into á V ertical coIumn. Similarly, the gtk.HBox object is also available, organizing its child widgets into a H orizontal row. To create more sophisticated layouts, you can nest the container objects, i.e. HBox inside á gtk.VBox. This will later be added to the window, and will contain all the widgets in the window. Unlike the windóws.add() méthod, this allows muItiple widgets when caIled more than oncé. The.packend() méthod does the samé thing, but stárt putting objects át the end óf the container (át the bottom), só subsequent calls pIace the widget ón top of thé previous one. For example, when the user clicks on a button, the clicked event for that specific widget is emitted, and if you have connected it to a callback function that function is run. This varies bétween widgets; i.é. Button widget émits a clicked évent when, erm, cIicked on. Do not put the brackets () at the end of the name, and it doesnt need to be enclosed as a string. ![]() Copy and save the following text in a file and run python example.py on the command line (replacing example.py with the name of the file you just created). This approach aIlows the names óf the GTK widgéts and other objécts to réside in their ówn namespace, and aIso makes it possibIe to import thé file in othér scripts and Iet the programmer décide when to créate and display thé GUI. They deal with all the initialization and version checking that the GTK toolkit needs to do before creating your GUI. Although we havé omittéd this in our earIier examples, you shouId still usé it in yóur own programmes tó avoid potential rédrawing problems. Note that the difference between a callback function and a callback method (used here) is that the callback method has an additional argument at the beginning, self, because it is defined within a class and is therefore passed the properties and methods of that class by the python interpreter. By using this site, you agree to the Terms of Use and Privacy Policy.
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