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using System.Collections.Generic; using System.Windows; using System.Windows.Media.Imaging; namespace Recipe5_4 { //data for a single menu item public class MenuItemData { //image URI string used to load the image internal string ImageUri { set { MenuItemImage = new BitmapImage(); MenuItemImage.SetSource(this.GetType().Assembly. GetManifestResourceStream(this.GetType().Namespace + "." + value)); } } //menu item image public BitmapImage MenuItemImage { get; set; } //menu item caption public string MenuItemCaption { get; set; } //children items for submenus public List<MenuItemData> Children { get; set; } //parent menu item public MenuItemData Parent { get; set; } //toggle submenu arrow visibility based on presence of children items public Visibility SubMenuArrow {

get { return (Children == null || Children.Count == 0 Visibility.Collapsed : Visibility.Visible); } } } } The ImageUri property setter is used to load an image bitmap that can be accessed through the MenuItemImage property. See 2 for more about loading assembly-embedded resources using GetManifestResourceStream(). A submenu is defined by having entries in the Children collection. For an item in a submenu, the parent MenuItemData instance is contained in the Parent property. The SubMenuArrow property will be bound appropriately in XAML to control the visibility of the right arrow mark that indicates the presence of a submenu. Listing 5-6 shows the codebehind for the page.

using using using using using using System.Collections.Generic; System.Windows; System.Windows.Controls; System.Windows.Controls.Primitives; System.Windows.Input; System.Windows.Media;

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namespace Recipe5_4 { public partial class MainPage : UserControl { //data for the top level menu internal List<MenuItemData> TopMenuData = null; //popups for the topmenu and the submenu Popup TopMenu, SubMenu; //Listboxes for the menu content ListBox lbxTopMenu, lbxSubMenu; public MainPage() { InitializeComponent(); //initialize the menu data TopMenuData = new List<MenuItemData> { new MenuItemData{MenuItemCaption="Camera", ImageUri="Camera.png"}, new MenuItemData{MenuItemCaption="CD Drive",ImageUri="CD_Drive.png"},

In order to make sure the user s data submission meets our data format requirements, ZK supports the constraint component for specifying acceptable formats for input values. The constraint component can be a property of the textbox component, which we used to allow user input. The parameters of constraint should be a regular expression or a predefined string of ZK; for example, setting a text box s constraint to the string no empty means that the form cannot be submitted without a value in that box.

new new new new };

MenuItemData{MenuItemCaption="Computer",ImageUri="Computer.png"}, MenuItemData{MenuItemCaption="Dialup",ImageUri="Dialup.png"}, MenuItemData{MenuItemCaption="My Network",ImageUri="mynet.png"}, MenuItemData{MenuItemCaption="Mouse",ImageUri="Mouse.png"}

TopMenuData[4].Children = new List<MenuItemData> { new MenuItemData{MenuItemCaption="Network Folder", ImageUri="Network_Folder.png",Parent = TopMenuData[4]}, new MenuItemData{MenuItemCaption="Network Center", ImageUri="Network_Center.png",Parent = TopMenuData[4]}, new MenuItemData{MenuItemCaption="Connect To", ImageUri="Network_ConnectTo.png",Parent = TopMenuData[4]}, new MenuItemData{MenuItemCaption="Internet", ImageUri="Network_Internet.png",Parent = TopMenuData[4]} }; //create and initialize the top menu popup TopMenu = new Popup(); lbxTopMenu = new ListBox(); //set the listbox style to apply the menu look templating lbxTopMenu.Style = this.Resources["styleMenu"] as Style; //bind the topmenu data lbxTopMenu.ItemsSource = TopMenuData; TopMenu.Child = lbxTopMenu; //create and initialize the submenu SubMenu = new Popup(); lbxSubMenu = new ListBox(); lbxSubMenu.MouseLeave += new MouseEventHandler(lbxSubMenu_MouseLeave); lbxSubMenu.Style = this.Resources["styleMenu"] as Style; SubMenu.Child = lbxSubMenu; } //set the top menu position private void SetTopMenuPosition(Popup Target, FrameworkElement CoordSpaceSource) { //get the transform to use GeneralTransform transform = this.TransformToVisual(CoordSpaceSource); //transform the left-bottom corner Point pt = transform.Transform(new Point(0.0, CoordSpaceSource.ActualHeight)); //set offsets accordingly

Target.HorizontalOffset = pt.X; Target.VerticalOffset = pt.Y; } //set the submenu position private void SetSubMenuPosition(Popup Target, FrameworkElement CoordSpaceSource, int ItemIndex, FrameworkElement ParentMenuItem) { //get the transform to use GeneralTransform transform = this.TransformToVisual(CoordSpaceSource); //transform the right-top corner Point pt = transform.Transform( new Point(ParentMenuItem.ActualWidth, CoordSpaceSource.ActualHeight + (ParentMenuItem.ActualHeight * ItemIndex))); //set offsets accordingly Target.HorizontalOffset = pt.X; Target.VerticalOffset = pt.Y; } private void btnDropDown_Click(object sender, RoutedEventArgs e) { //position the top menu SetTopMenuPosition(TopMenu, LayoutRoot); //show or hide TopMenu.IsOpen = !TopMenu.IsOpen; } private void LbxItemRoot_MouseEnter(object sender, MouseEventArgs e) { //get the listboxitem for the selected top menu item ListBoxItem lbxItem = (sender as Grid).Parent as ListBoxItem; //get the bound MenuItemData MenuItemData midTop = (sender as Grid).DataContext as MenuItemData; //do we have children and are we on the top menu if (midTop.Parent == null && (midTop.Children == null || midTop.Children.Count == 0)) { //do not show the submenu SubMenu.IsOpen = false; } else if (midTop.Children != null && midTop.Children.Count > 0) { //yes - position sub menu SetSubMenuPosition(SubMenu, LayoutRoot, TopMenuData.IndexOf(midTop),

Once I was on a panel at NYU giving students advice on careers in IT. My advice was that before graduating you should make sure to learn how to write well, maybe by taking a creative writing course, and take a class in Econ so that the business side of the business isn t a mystery.2 I also recommended at least one low-level programming course in C or Assembler just to help you understand how computers work at a lower level.

Note A regular expression is a string used for matching a set of words according to predefined syntax. There is a tutorial in using regular expression on Sun s website (http://java.sun.com/docs/books/tutorial/essential/regex/).

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