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Figure 3-29. queryTable1.xml contents We find that there s a new folder in our structure called tables. In this folder is a file named Table1.xml (shown in Figure 3-30). Table1.xml looks very similar to queryTables1.xml. It has the same field mapping information, but also contains information about the range name (Table_Northwind_2007.accdb), cell locations for the data, what data is autofiltered, and whether a totals row is shown.

To begin implementing the application, update the Form with a Timer member variable (named swellTimer), a string (strFontFace) to represent the current font face, and an integer (swellValue) to represent the amount to adjust the font size. Within the Form s constructor, configure the Timer to emit a Tick event every 100 milliseconds: public partial class MainForm : Form { private Timer swellTimer = new Timer(); private int swellValue; private string strFontFace = "WingDings"; public MainForm() { InitializeComponent(); BackColor = Color.Honeydew; CenterToScreen(); // Configure the Timer. swellTimer.Enabled = true; swellTimer.Interval = 100; swellTimer.Tick += new EventHandler(swellTimer_Tick); } } In the Tick event handler, increase the value of the swellValue data member by 5. Recall that the swellValue integer will be added to the current font size to provide a simple animation (assume swellValue has a maximum upper limit of 50). To help reduce the flicker that can occur when redrawing the entire client area, notice how the call to Invalidate() is only refreshing the upper rectangular area of the Form: private void swellTimer_Tick(object sender, EventArgs e) { // Increase current swellValue by 5. swellValue += 5; // If this value is greater than or equal to 50, reset to zero. if(swellValue >= 50) swellValue = 0;

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// Just invalidate the minimal dirty rectangle to help reduce flicker. Invalidate(new Rectangle(0, 0, ClientRectangle.Width, 100)); } Now that the upper 100 pixels of your client area are refreshed with each tick of the Timer, you had better have something to render! In the Form s Paint handler, create a Font object based on the user-defined font face (as selected from the appropriate menu item) and current swellValue (as dictated by the Timer). Once you have your Font object fully configured, render a message into the center of the dirty rectangle: private void MainForm_Paint(object sender, PaintEventArgs e) { Graphics g = e.Graphics; // Our font size can be between 12 and 62, // based on the current swellValue. Font theFont = new Font(strFontFace, 12 + swellValue); string message = "Hello GDI+"; // Display message in the center of the rect. float windowCenter = this.DisplayRectangle.Width/2; SizeF stringSize = g.MeasureString(message, theFont); float startPos = windowCenter - (stringSize.Width/2); g.DrawString(message, theFont, new SolidBrush(Color.Blue), startPos, 10); } As you would guess, if a user selects a specific font face, the Clicked handler for each menu selection is in charge of updating the fontFace string variable and invalidating the client area, for example: private void arialToolStripMenuItem_Click(object sender, EventArgs e) { strFontFace = "Arial"; Invalidate(); } The Click menu handler for the Swell menu item will be used to allow the user to stop or start the swelling of the text (i.e., enable or disable the animation). To do so, toggle the Enabled property of the Timer as follows: private void swellToolStripMenuItem_Click(object sender, EventArgs e) { swellTimer.Enabled = !swellTimer.Enabled; }

Next, let s expand this program to display the set of installed fonts on the target machine using types within System.Drawing.Text. This namespace contains a handful of types that can be used to discover and manipulate the set of fonts installed on the target machine. For our purposes, we are only concerned with the InstalledFontCollection class. When the user selects the Configure List Installed Fonts menu item, the corresponding Clicked handler creates an instance of the InstalledFontCollection class. This class maintains an array named FontFamily, which represents the set of all fonts on the target machine and may be obtained using the InstalledFontCollection.Families property. Using the FontFamily.Name property, you are able to extract the font face (e.g., Times New Roman, Arial, etc.) for each font. Add a private string data member to your Form named installedFonts to hold each font face. The logic in the List Installed Fonts menu handler creates an instance of the InstalledFontCollection type, reads the name of each string, and adds the new font face to the private installedFonts data member:

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