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Subclasses of class Layer can be drawn at any time using the paint method The Layer will be drawn on the Graphics object according to the current state information maintained by the Layer object (that is, position, visibility, and so forth) The Layer object is drawn at its current position relative to the current origin of the Graphics object Erasing the Layer is always the responsibility of the code outside the Layer class [ Team LiB ]

while True: event = getNextEvent() if event: if event == Terminate: break processEvent(event)

When the user interacts with the program, or when certain other things occur, such as a timer timing out or the program s window being activated (maybe because another program was closed), an event is generated inside the GUI library and added to the event queue The program s event loop continuously checks to see whether there is an event to process, and if there is, it processes it (or passes it on to the event s associated function or method for processing) As GUI programmers we can rely on the GUI library to provide the event loop Our responsibility is to create classes that represent the windows and widgets our program needs and to provide them with methods that respond appropriately to user interactions

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Listing 139 shows the con guration information used to host the The most important aspect of this con guration inforbinding and the mation is the use of the endpoint behavior This enables the use of JSON and generates the neceswith ASPNET sary client-side proxy code for the

The rst program we will look at is the Interest program This is a dialog-style program (ie, it has no menus), which the user can use to perform compound interest calculations The program is shown in Figure 152 In most object-oriented GUI programs, a custom class is used to represent a single main window or dialog, with most of the widgets it contains being instances of standard widgets, such as buttons or checkboxes, supplied by the library Like most cross-platform GUI libraries, Tk doesn t really make a distinction between a window and a widget a window is simply a widget that has no widget parent (ie, it is not contained inside another widget) Widgets that don t have a widget parent (windows) are automatically supplied with a frame and window decorations (such as a title bar and close button), and they usually contains other widgets Most widgets are created as children of another widget (and are contained inside their parent), whereas windows are created as children of the tkinterTk

object an object that conceptually represents the application, and something we will return to later on In addition to distinguishing between widgets and windows (also called top-level widgets), the parent child relationships help ensure that widgets are deleted in the right order and that child widgets are automatically deleted when their parent is deleted The initializer is where the user interface is created (the widgets added and laid out, the mouse and keyboard bindings made), and the other methods are used to respond to user interactions Tk allows us to create custom widgets either by subclassing a prede ned widget such as tkinterFrame, or by creating an ordinary class and adding widgets to it as attributes Here we have used subclassing in the next example we will show both approaches Since the Interest program has just one main window it is implemented in a single class We will start by looking at the class s initializer, broken into ve parts since it is rather long

[ Team LiB ]

class MainWindow(tkinterFrame): def __init__(self, parent): super()__init__(parent) selfparent = parent selfgrid(row=0, column=0)

You con gure the to be used with ASPNET by Listing adding a reference to the service using the ASPNET Behind 1310 shows the markup used to reference the the scenes this is generating client-side script that references a JavaScript le with the client-side proxy For our example, the URI to the client-side JavaScript is http://localhost/GameReviewService/GameReviewService svc/js

We begin by initializing the base class, and we keep a copy of the parent for later use Rather than using absolute positions and sizes, widgets are laid out inside other widgets using layout managers The call to grid() lays out the frame using the grid layout manager Every widget that is shown must be laid out, even top-level ones Tk has several layout managers, but the grid is the easiest to understand and use, although for top-level layouts where there is only one widget to lay out we could use the packer layout manager by calling pack() instead of grid(row=0, column=0) to achieve the same effect

selfprincipal = tkinterDoubleVar() selfprincipalset(10000)

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