GRA PHICS AN D G RAPHIC AL US ER INTERFA CES in VB.NET

Painting QR Code 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 11-44. A full-size list box with centered text
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Creating Items with Complex Content
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Now that you have learned how to create and configure list boxes and derive custom list box items for general or special purposes, like highlighting selected items or special text items, you are able to create list boxes with complex content using all you learned about user interface elements in the previous sections. To create multiple columns in a list box item, you should add a horizontal stack panel and populate it with different elements, such as text and images. You can set margins for the elements to separate them and use different alignments for each column. The sample in Listing 11-33 builds a rather complex list box (shown in Figure 11-45). The first two items are simple text items followed by a separator. For the simple text items, we do not use the HighlightableTextListBoxItem; instead, we create the text manually to have full layout control, like setting a margin. We could also modify HighlightableTextListBoxItem to accept a Text element object. After the simple text items and one text item with icon, the list contains items with multiple columns using a vertical stack panel. The first column is rightaligned text, then an icon followed by left-aligned text. The next two items present a multiline text using a text flow element.
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Figure 11-45. Complex list box content
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Listing 11-33. Building a Complex List Box 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 ComplexListBoxSample { 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);
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CHAPTER 11 GRA PHICS AN D G RAPHIC AL US ER INTERFA CES
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Font normalFont = Resources.GetFont(Resources.FontResources.NinaB); Font smallFont = Resources.GetFont(Resources.FontResources.small); // Create a list box control and add text items ListBox listBox = new ListBox(); // set the width so that it fills the entire screen listBox.Child.Width = mainWindow.Width; // 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; // Add simple text items for (int i = 0; i < 2; ++i) { string str = "Simple text item"; Text text = new Text(normalFont, str); text.SetMargin(2); ListBoxItem item = new HighlightableListBoxItem(text); listBox.Items.Add(item); } // Add a separator listBox.Items.Add(new SeparatorListBoxItem()); // Add a text item with icon { // Create the stack panel to align the elements StackPanel stackPanel = new StackPanel(Orientation.Horizontal); // Icon Bitmap bmp = Resources.GetBitmap(Resources.BitmapResources.Clock); // Make the bitmap transparent using // the color of the top left corner pixel. // Therefore the image should not be in the Bitmap and Jpeg format // because that requires to create a copy in order to make it // transparent. Use Gif instead. bmp.MakeTransparent(bmp.GetPixel(0, 0)); Image image = new Image(bmp); image.SetMargin(2); // set a margin to separate the image // vertically center the icon within the item image.VerticalAlignment = VerticalAlignment.Center; stackPanel.Children.Add(image);
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C HAPT ER 11 GRAPHICS AND GRA PHICA L USE R IN TERFA CES
// Text Text text = new Text(normalFont, "Item with an icon and text"); text.SetMargin(2); // set margin to separate the text // vertically center the icon within the item text.VerticalAlignment = VerticalAlignment.Center; stackPanel.Children.Add(text); // Create a highlightable list box item ListBoxItem item = new HighlightableListBoxItem(stackPanel); listBox.Items.Add(item); } // Add a separator listBox.Items.Add(new SeparatorListBoxItem()); // Add two items with multiple columns // use i to add a right aligned number to the first column for(int i = 0; i <= 100; i += 50) { //create the stack panel to align the elements StackPanel stackPanel = new StackPanel(Orientation.Horizontal); // Add right aligned text Text text1 = new Text(normalFont, i.ToString()); text1.Width = 30; text1.SetMargin(2); // set margin to separate the text text1.TextAlignment = TextAlignment.Right; // vertically center the icon within the item text1.VerticalAlignment = VerticalAlignment.Center; stackPanel.Children.Add(text1); // Icon Bitmap bmp = Resources.GetBitmap(Resources.BitmapResources.Audio); // Make the bitmap transparent using // the color of the top left corner pixel. // Therefore the image should not be in the Bitmap and Jpeg format // because that requires to create a copy in order to make it // transparent. Use Gif instead. bmp.MakeTransparent(bmp.GetPixel(0, 0)); Image image = new Image(bmp); image.SetMargin(2); // set a margin to separate the image // vertically center the icon within the item image.VerticalAlignment = VerticalAlignment.Center; stackPanel.Children.Add(image);
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