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A trigger can be defined on any variable regardless of where it is declared. It can be defined on a member variable of a class, on a script variable, on a local variable declared within a function, block, and so on. One can also define a trigger within another trigger since a trigger is just another block. Also, it is possible to change the value of a variable from within its own trigger. Listing 11-15 shows a simple example of how nesting can be implemented. Listing 11-15. NestedTriggers.fx 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. class TriggerSample { var w = 100 on replace oldVal { var valid = isValid(w) on replace { if (not valid) { println("Invalid value {w}. Reset to {oldVal}"); w = oldVal; } else { println("Valid value {w}"); } println(w); } } } function isValid(val: Integer) { val > 0; } function run() { var sample = TriggerSample{}; sample.w = 200; sample.w = 0; }

Your web pages will always have a few images without the alt, height, and width attributes because of the way Office Live assembles web pages. There are two situations in which you can t control how Office Live renders images, and therefore, you can t control the attributes of the img tag: When Office Live inserts header images for you depending on the theme and style you select When you place an image on your page using the Image button on Page Editor s Ribbon

As an example, consider the Windows-based application shown in Figure 12-1. It consists of a single window that always stays on top of all other windows regardless of focus. (This behavior is enforced by setting the Form.TopMost property to true.) The form also includes a timer that periodically calls the unmanaged GetForegroundWindow and GetWindowText WinAPI functions to determine which window is currently active.

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One additional detail in this example is that the code also uses the Form.Handle property to get the handle of the main application form. It then compares with the handle of the active form to test if the current application has focus. The following is the complete code for this form. using using using using System; System.Windows.Forms; System.Runtime.InteropServices; System.Text;

Output 1. Valid value 100 2. 100 3. Valid value 200 4. 200 5. Invalid value 0. Reset to 200 6. Valid value 200 7. 200 8 200 In Listing 11-15, we are defining a variable w as a member of a class, whose value we are validating within the trigger and resetting it if it is invalid. So there is another trigger defined within the main trigger here, and the nested trigger validates the value of w. As you see in the code, the inner trigger calls a script-level function to validate the value. Now let us analyze the output.

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namespace Apress.VisualCSharpRecipes.12 { public partial class ActiveWindowInfo : Form { public ActiveWindowInfo() { InitializeComponent(); } // Declare external functions. [DllImport("user32.dll")] private static extern IntPtr GetForegroundWindow(); [DllImport("user32.dll")] private static extern int GetWindowText(IntPtr hWnd, StringBuilder text, int count); private void tmrRefresh_Tick(object sender, EventArgs e) { int chars = 256; StringBuilder buff = new StringBuilder(chars); // Obtain the handle of the active window. IntPtr handle = GetForegroundWindow(); // Update the controls. if (GetWindowText(handle, buff, chars) > 0) { lblCaption.Text = buff.ToString();

Line 1, 2: Printed when w is initialized. Line 3: Setting w to 200 in the code calls the trigger, and this value has been validated to true. Line 4: W is set with the value of 200 after validation. Line 5: Sets a value of 0 to w. The isValid() function is called and returns false. Since the value is invalid, we are resetting the value to back to 200 (the old value). Line 6: Note that 200 is not printed yet, which means line 9 from the code is not yet executed. This is because resetting the w value within the validation trigger calls the main trigger again, and this time isValid returns true for the reset value of 200. Lines 7, 8: 200 is printed twice once for the reset operation (caused by the inner trigger) and another time for the actual value set by the application (w = 0). There are a few more things to note in this example: the script-level function isValid() is accessed from within the trigger, a nested trigger is used to validate the value, and the value of the variable is changed from within the same trigger. Also note that the variable w is accessible within the inner trigger of valid, and this is true for any block it can access the variables of the parent block.

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