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Now let s see what happens if the user clicks the Close button (red X). If you close the application by using the Close button, it closes permanently. Yet, our design requirements state that the application should simply minimize back to the notification area when the user clicks the Close button. Therefore, you ll now intercept an event that occurs just before the form is closed and just before the form object is deleted, which is an event called the FormClosing event. By using a FormClosing event, you can extract the reason for the form s closing and in this way intercept the event when the user clicks the Close button.
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6 the FormClosing event. Add the following code to the Main_FormClosing event handler.
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27 private void Main_FormClosing(object sender, FormClosingEventArgs e) 28 { 29 30 31 32 33 34 } } if (e.CloseReason == CloseReason.UserClosing) { e.Cancel = true; this.Hide();
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In Design view, select the Main form. Go to the events list in the Properties window and double-click
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If you want to learn more about why a form might be closing, you can search the Help system by entering the following keywords: CloseReason enumeration.
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Part of the event is the FormClosingEventArgs, which contains the arguments that accompany the event notification as well as the reason why the form is closing. If the user is closing the form, setting the Cancel property to true will stop the closing process and prevent the form from closing. The next instruction is a call to the Hide method. The Hide method is simply a synonym for setting the Visible property to false. The form will simply be hidden. When the user selects the Exit choice from the context menu, the FormClosing event will be raised; however, the reason given will not be UserClosing. Instead it will be ApplicationExitCall, and therefore the application will continue the closing process. You ll now add the code for the Open . . . menu choice. To write the code for this event, select
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The UserClosing event would also be called whenever the user presses Alt+F4 or if the user selects Close from the Form Control menu (the menu that appears when you click on the left corner where the icon is usually located).
7 cmsNotify in the component tray and then double-click on the Open . . . menu choice on the
context menu strip. The click event handler will be created, and you ll call the Restore method to handle the form s visibility, which is done by the this.Restore() code. You will add code to make sure the form has the focus so that it ends up on top of any other displayed windows. Add the following code to the tsmiOpen_Click event handler:
35 private void tsmiOpen_Click(object sender, EventArgs e) 36 { 37 38 39 } this.Restore(); this.Focus();
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Now, test the application with the following test scenario: Start the application by pressing F5. Right-click on the notify icon and select Open . . . The Main form should appear in the middle of your screen. Minimize the Main form by clicking the Close button. Once it is minimized, double-click the notify icon. You should again see the Main Form. Terminate the application by selecting the Exit menu choice.
Adding the Splash Screen and About Dialog Box
Since you have done these procedures in 6, I won't spend too much time on this section. You'll just add forms that are almost finished from the companion content. Follow these steps to add the SplashWeather.cs form and AboutWeatherTracker.cs form to your project.
TO ADD A SPLASH SCREEN AND ABOUT DIALOG BOX 1 Existing Item. The Add Existing Item dialog box apears.
In the Solution Exoplorer, right-click the Weather Tracker project, select Add, and then select
2 content is located at \My Documents\Microsoft Press\VCS 2005 Express\. 3 file.
Browse to the SplashAbout folder under the 9 companion content. By default the companion
Select the AboutWeatherTracker.cs file and, while pressing the Ctrl key, select the SplashWeather.cs
4 Explorer.
Click Add to add the AboutWeatherTracker and SplashWeather forms to your project in Solution
Using the following table, set the specified properties on the SplashWeather form. Images are located in the Images folder under 9 of the companion content.o
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