Dialog-Style Programs in Java

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Dialog-Style Programs
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that invoked them as their rst argument, and we don t want this event So, we use a lambda function that accepts but ignores the event and calls the method without the unwanted argument We have also created two keyboard shortcuts these are key combinations that invoke a particular action Here we have set Ctrl+Q and Esc and bound them both to the selfquit() method that cleanly terminates the program It is possible to create keyboard bindings for individual widgets, but here we have set them all on the parent (the application), so they all work no matter where the keyboard focus is Tk s bind() method can be used to bind both mouse clicks and key presses, and also programmer-de ned events Special keys like Ctrl and Esc have Tk-speci c names (Control and Escape), and ordinary letters stand for themselves Key sequences are created by putting the parts in angle brackets and separating them with hyphens Having created and laid out the widgets, and set up the key bindings, the appearance and basic behavior of the program are in place Now we will review the methods that respond to user actions to complete the implementation of the program s behavior
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def updateUi(self, *ignore): amount = selfprincipalget() * ( (1 + (selfrateget() / 1000)) ** selfyearsget()) selfamountset("{0:2f}"format(amount))
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This method is called whenever the user changes the principal, the rate, or the years since it is the command associated with each of the scales All it does is retrieve the value from each scale s associated variable, perform the compound interest calculation, and store the result (as a string) in the variable associated with the actual amount label As a result, the actual amount label always shows an up-to-date amount
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def quit(self, event=None): selfparentdestroy()
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If the user chooses to quit (by pressing Ctrl+Q or Esc, or by clicking the window s close button) this method is called Since there is no data to save we just tell the parent (which is the application object) to destroy itself The parent will destroy all of its children all of the windows, which in turn will destroy all of their widgets so a clean termination takes place
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application = tkinterTk() path = ospathjoin(ospathdirname(__file__), "images/") if sysplatformstartswith("win"): icon = path + "interestico"
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15 Introduction to GUI Programming
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else: icon = "@" + path + "interestxbm" applicationiconbitmap(icon) applicationtitle("Interest") window = MainWindow(application) applicationprotocol("WM_DELETE_WINDOW", windowquit) applicationmainloop()
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After de ning the class for the main (and in this case only) window, we have the code that starts the program running We begin by creating an object to represent the application as a whole To give the program an icon on Windows we use an ico le and pass the name of the le (with its full path) to the iconbitmap() method But for Unix platforms we must provide a bitmap (ie, a monochrome image) Tk has several built-in bitmaps, so to distinguish one that comes from the le system we must precede its name with an @ symbol Next we give the application a title (which will appear in the title bar), and then we create an instance of our MainWindow class giving the application object as its parent At the end we call the protocol() method to say what should happen if the user clicks the close button we have said that the MainWindowquit() method should be called, and nally we start the event loop it is only when we reach this point that the window is displayed and is able to respond to user interactions
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Main-Window-Style Programs
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Although dialog-style programs are often suf cient for simple tasks, as the range of functionality a program offers grows it often makes sense to create a complete main-window-style application with menus and toolbars Such applications are usually easier to extend than dialog-style programs since we can add extra menus or menu options and toolbar buttons without affecting the main window s layout In this section we will review the bookmarks-tkpyw program shown in Figure 154 The program maintains a set of bookmarks as pairs of (name, URL) strings and has facilities for the user to add, edit, and remove bookmarks, and to open their web browser at a particular bookmarked web page The program has two windows: the main window with the menu bar, toolbar, list of bookmarks, and status bar; and a dialog window for adding or editing bookmarks
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