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Menu systems in WPF are represented by the Menu class, which maintains a collection of MenuItem objects. When building a menu system in XAML, you can have each MenuItem handle various events. The most notable of these events is Click, which occurs when the end user selects a sub-item. In this example, you begin by building the two topmost menu items (File and Tools; you will build the Edit menu later in this example), which expose Exit and Spelling Hints sub-items, respectively. In addition to handling the Click event for each sub-item, you also need to handle the MouseEnter and MouseExit events, which you will use to set the status bar text in a later step. Add the following markup within your <DockPanel> scope (feel free to use Properties window of Visual Studio 2010 to help minimize the amount of markup you need to type by hand): <!--Dock menu system on the top--> <Menu DockPanel.Dock ="Top" HorizontalAlignment="Left" Background="White" BorderBrush ="Black"> <MenuItem Header="_File"> <Separator/> <MenuItem Header ="_Exit" MouseEnter ="MouseEnterExitArea" MouseLeave ="MouseLeaveArea" Click ="FileExit_Click"/> </MenuItem> <MenuItem Header="_Tools"> <MenuItem Header ="_Spelling Hints" MouseEnter ="MouseEnterToolsHintsArea" MouseLeave ="MouseLeaveArea" Click ="ToolsSpellingHints_Click"/> </MenuItem> </Menu> Notice that you dock the menu system to the top of the DockPanel. Also, you use the <Separator> element to insert a thin horizontal line in the menu system, directly before the Exit option. Also notice that the Header values for each MenuItem contain an embedded underbar token (e.g., _Exit). You use this

The submit function is the function that takes care of actual form processing after the form has been validated. It executes only if form validation passed completely and the form has not been flagged for rebuilding. The submit function is expected to modify $form_state['redirect']. function formexample_form_submit($form, &$form_state) { // Do some stuff. ... // Now send user to node number 3. $form_state['redirect'] = 'node/3'; } If you have multiple functions handling form submittal (see the Submitting the Form section earlier in this chapter), the last function to set $form_state['redirect'] will have the last word.

token to establish which letter will be underlined when the end user presses the Alt key (for keyboard shortcuts). So far you ve implemented the complete the menu system definition; next, you need to implement the various event handlers. First, you have the File Exit handler, FileExit_Click(), which simply closes the window, which in turn terminates the application because this is your topmost window. The MouseEnter and MouseExit event handlers for each sub-item will eventually update your status bar; however, for now, you will simply provide shells. Finally, the ToolsSpellingHints_Click() handler for the Tools Spelling Hints menu item will also remain a shell for the time being. Here are the current updates to your code-behind file: public partial class MainWindow : System.Windows.Window { public MainWindow() { InitializeComponent(); } protected void FileExit_Click(object sender, RoutedEventArgs args) { // Close this window. this.Close(); } protected { } protected { } protected { } protected { } } void ToolsSpellingHints_Click(object sender, RoutedEventArgs args) void MouseEnterExitArea(object sender, RoutedEventArgs args) void MouseEnterToolsHintsArea(object sender, RoutedEventArgs args) void MouseLeaveArea(object sender, RoutedEventArgs args)

Toolbars (represented by the ToolBar class in WPF) typically provide an alternative manner for activating a menu option. Add the following markup directly after the closing scope of your <Menu> definition: <!-- Put Toolbar under the Menu --> <ToolBar DockPanel.Dock ="Top" > <Button Content ="Exit" MouseEnter ="MouseEnterExitArea" MouseLeave ="MouseLeaveArea" Click ="FileExit_Click"/> <Separator/> <Button Content ="Check" MouseEnter ="MouseEnterToolsHintsArea" MouseLeave ="MouseLeaveArea" Click ="ToolsSpellingHints_Click"

Tip The $form_state['rebuild'] flag can be set in submit functions too, just like in validation functions. If set, all submit functions will run but any redirect value will be ignored, and the form will be rebuilt using the submitted values. This can be useful for adding optional fields to a form.

Equals()

By default, this method returns true only if the items being compared refer to the exact same item in memory. Thus, Equals() is used to compare object references, not the state of the object. Typically, this method is overridden to return true only if the objects being compared have the same internal state values (that is, value-based semantics). Be aware that if you override Equals(), you should also override GetHashCode(), as these methods are used internally by Hashtable types to retrieve subobjects from the container. Also recall from 4, that the ValueType class overrides this method for all structures, so they work with value-based comparisons.

Table 6-1. Core Members of System.Object (continued)

Changing Forms with hook_form_alter()

Finalize()

For the time being, you can understand this method (when overridden) is called to free any allocated resources before the object is destroyed. I talk more about the CLR garbage collection services in 8. This method returns an int that identifies a specific object instance. This method returns a string representation of this object, using the <namespace>.<type name> format (termed the fully qualified name). This method will often be overridden by a subclass to return a tokenized string of name/value pairs that represent the object s internal state, rather than its fully qualified name. This method returns a Type object that fully describes the object you are currently referencing. In short, this is a Runtime Type Identification (RTTI) method available to all objects (discussed in greater detail in 15). This method exists to return a member-by-member copy of the current object, which is often used when cloning an object (see 9).