.net core qr code generator GRA PHICS AN D G RAPHIC AL US ER INTERFA CES in VB.NET

Creation QR Code JIS X 0510 in VB.NET GRA PHICS AN D G RAPHIC AL US ER INTERFA CES

CHAPTER 11 GRA PHICS AN D G RAPHIC AL US ER INTERFA CES
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Figure 11-41. A list with separators
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List Boxes with a Background
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In the previous chapter, you learned how to create controls with a background and how to create transparent controls by setting the background to null. The ListBox class is derived from ContentControl and provides its own background. In order to create a list box with a background, you need to add a background to the parent control of the list box (e.g., the window) and set the background of the list box to null or to set the background of the list box directly. Further, you need to set the background of your list box items to null, because a ListBoxItem is a content control and, therefore, has its own background, which is set by default to white. The HighlightableListBoxItem element has a transparent background when it is not selected. It is important to make the background transparent in the OnIsSelectedChanged method and to do so at the beginning in the constructor. But that s not enough. The ListBox class internally embeds a ScrollViewer control that holds all the list box items. A ScrollViewer is a content control and, therefore, provides its own white background by default. There are no properties for ScrollViewer, but you can get the ScrollViewer instance via the Child property of the list box. Listing 11-32 demonstrates how to create a list box with a gradient color background, and Figure 11-42 shows how it looks.
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Figure 11-42. A list with a gradient color background
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Listing 11-32. Creating a List with a Gradient Color Background using System; using using using using using using Microsoft.SPOT; Microsoft.SPOT.Input; Microsoft.SPOT.Presentation; Microsoft.SPOT.Presentation.Controls; Kuehner.SPOT.Presentation.Controls; Microsoft.SPOT.Presentation.Media;
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namespace ListBoxBackgroundSample { public class Program : Microsoft.SPOT.Application { public static void Main() { Program myApplication = new Program(); Window mainWindow = myApplication.CreateWindow(); // Create the object that configures the GPIO pins to buttons. GPIOButtonInputProvider inputProvider = new GPIOButtonInputProvider(null); // Start the application myApplication.Run(mainWindow); } private Window mainWindow; public Window CreateWindow() { // Create a window object and set its size to the // size of the display. mainWindow = new Window(); mainWindow.Height = SystemMetrics.ScreenHeight; mainWindow.Width = SystemMetrics.ScreenWidth; // Add a gradient color background to the window mainWindow.Background = new LinearGradientBrush(Colors.White, Colors.Red, 0, 0, mainWindow.Width, mainWindow.Height); Font font = Resources.GetFont(Resources.FontResources.NinaB);
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CHAPTER 11 GRA PHICS AN D G RAPHIC AL US ER INTERFA CES
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// Create a list box control and add text items ListBox listBox = new ListBox(); // make the list box transparent listBox.Background = null; // make the enclosed scroll viewer transparent also // we get the scroll viewer via the child property but // need to cast it to Control in order to clear the background ((Control)listBox.Child).Background = null; for (int i = 0; i < 10; ++i) { string str = "Item " + i.ToString() + ". Hello World."; ListBoxItem item = new HighlightableTextListBoxItem(font, str); listBox.Items.Add(item); if (i > 0 && i % 4 == 0) listBox.Items.Add(new SeparatorListBoxItem()); } // Add the text control to the window. mainWindow.Child = listBox; // Set the window visibility to visible. mainWindow.Visibility = Visibility.Visible; // Let the user select items with the up and down buttons. Buttons.Focus(listBox); // Get notified when the selected item was changed. listBox.SelectionChanged += new SelectionChangedEventHandler(listBox_SelectionChanged); // Get notified when a selected item was pressed // using the select button. listBox.AddHandler(Buttons.ButtonDownEvent, new ButtonEventHandler(listBox_ButtonDown), false); return mainWindow; } private void listBox_SelectionChanged(object sender, SelectionChangedEventArgs args) { Debug.Print("Item " + args.SelectedIndex + " was selected."); }
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private void listBox_ButtonDown(object sender, ButtonEventArgs args) { ListBox listBox = (ListBox)sender; if (args.Button == Button.Select) Debug.Print("Item " + listBox.SelectedIndex + " was pressed."); } } }
Full-Size List Boxes and Centered Text
If you add the following line to the code in Listing 11-32 after the list box is instantiated, you will see a list box that looks like the one shown in Figure 11-43 and fills the entire screen width: listBox.Child.Width = mainWindow.Width; You must set not the list box width but the width of the list box s child element, that is, the enclosed scroll viewer. The list box always calculates its desired size depending on the embedded scroll viewer.
Figure 11-43. A full-size list box If your list box needs to have center text like the one shown in Figure 11-44, you can add the following line to the constructor of HighlightableTextListBoxItem: this.text.HorizontalAlignment = HorizontalAlignment.Center; Instead of implementing this functionality in the constructor, you can set the alignment for each item individually. After you have created an item, you can set the horizontal alignment of its child. For a HighlightableTextListBoxItem instance, the text element is embedded as a child: ListBoxItem item = new HighlightableTextListBoxItem(font, str); item.Child.HorizontalAlignment = HorizontalAlignment.Center;
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