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For this window, instead of inheriting a widget as we did in the preceding example, we have just created a normal Python class If we inherit we can reimplement the methods of the class we have inherited, but if we don t need to do that we can simply use composition as we have done here The appearance is provided by creating widget instance variables, all contained within a tkinterFrame as we will see in a moment We need to keep track of four pieces of information: the parent (application) object, the name of the current bookmarks le, a dirty ag (if True this means that changes have been made to the data that have not been saved to disk), and the data itself, a dictionary whose keys are bookmark names and whose values are URLs To create a menu bar we must create a tkinterMenu object whose parent is the window s parent, and we must tell the parent that it has a menu (It may seem strange that a menu bar is a menu, but Tk has had a very long evolution which

Each tile is assigned a unique index number, as shown in Figure 127 The tile located in the upper-left corner of the Image is assigned an index of 1 (unlike Sprite where the first frame is given an index of 0) The remaining tiles are then numbered consecutively in row-major order (indices are assigned across the first row, then the second row, and so on) These tiles are regarded as static tiles because there is a fixed link between the tile and the image data associated with it The static tile set is created when the TiledLayer is instantiated; it can also be updated at any time using the setStaticTileSet method

Two additional classes, called and , host services using the binding and the endpoint behavior They offer the same con guration-free hosting capabilities as the and classes

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has left it with some odd corners) Menu bars created like this do not need to be laid out; Tk will do that for us

fileMenu = tkinterMenu(menubar) for label, command, shortcut_text, shortcut in ( ("New", selffileNew, "Ctrl+N", "<Control-n>"), ("Open", selffileOpen, "Ctrl+O", "<Control-o>"), ("Save", selffileSave, "Ctrl+S", "<Control-s>"), (None, None, None, None), ("Quit", selffileQuit, "Ctrl+Q", "<Control-q>")): if label is None: fileMenuadd_separator() else: fileMenuadd_command(label=label, underline=0, command=command, accelerator=shortcut_text) selfparentbind(shortcut, command) menubaradd_cascade(label="File", menu=fileMenu, underline=0)

Each menu bar menu is created in the same way First we create a tkinterMenu object that is a child of the menu bar, and then we add separators or commands to the menu (Note that an accelerator in Tk terminology is actually a keyboard shortcut, and that all the accelerator option sets is the text of the shortcut; it does not actually set up a key binding) The underline indicates which character is underlined, in this case the rst one of every menu option, and this letter becomes the menu option s keyboard accelerator In addition to adding a menu option (called a command), we also provide a keyboard shortcut by binding a key sequence to the same command as that invoked when the corresponding menu option is chosen At the end the menu is added to the menu bar using the add_cascade() method We have omitted the edit menu since it is structurally identical to the le menu s code

(Configuration Free)

In addition to the static tile set, the developer can also define several animated tiles An animated tile's appearance is provided by the static tile to which it is linked This link can be updated dynamically, thereby allowing the developer to change the appearance of several cells without having to update the contents of each cell individually This technique is very useful for animating large repeating areas without having to explicitly change the contents of numerous cells

frame = tkinterFrame(selfparent) selftoolbar_images = [] toolbar = tkinterFrame(frame) for image, command in ( ("images/filenewgif", selffileNew), ("images/fileopengif", selffileOpen), ("images/filesavegif", selffileSave), ("images/editaddgif", selfeditAdd), ("images/editeditgif", selfeditEdit), ("images/editdeletegif", selfeditDelete), ("images/editshowwebpagegif", selfeditShowWebPage)): image = ospathjoin(ospathdirname(__file__), image) try:

image = tkinterPhotoImage(file=image) selftoolbar_imagesappend(image) button = tkinterButton(toolbar, image=image, command=command) buttongrid(row=0, column=len(selftoolbar_images) -1) except tkinterTclError as err: print(err) toolbargrid(row=0, column=0, columnspan=2, sticky=tkinterNW)

We begin by creating a frame in which all of the window s widgets will be contained Then we create another frame, toolbar, to contain a horizontal row of buttons that have images instead of texts, to serve as toolbar buttons We lay out each toolbar button one after the other in a grid that has one row and as many columns as there are buttons At the end we lay out the toolbar frame itself as the main window frame s rst row, making it north west sticky so that it will always cling to the top left of the window (Tk automatically puts the menu bar above all the widgets laid out in the window) The layout is illustrated in Figure 155, with the menu bar laid out by Tk shown with a white background, and our layouts shown with gray backgrounds

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