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9: Building Your Own Weather Tracker Application
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Again, you created a private method called Restore in case you need it elsewhere for your Main form. The first line of code in the Restore method is there because it is impossible to know in which context your method will be called. In this case, when you created the form, you set the WindowState property to minimized and ShowInTaskbar to false so that the form starts minimized and the user doesn t see it. When you start the application, the first time the user clicks the Open menu choice (you ll code this soon) or double-clicks the notifyWeather control, the user won t be able to see the form if you have set only its Visible property to true. Therefore, you need to verify in which window state the form appears. If it s still minimized, you need to set it to Normal so that the focus is on the Main form. 5. Press F5 to test the changes. Double-click the notifyWeather icon in the notification area, and the Main form should appear. Now let s see what happens if the user clicks the Close button (the red X). If you close the application by clicking the Close button, it closes permanently. Yet, our design requirements state that the application should simply minimize 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 FormClosing. 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. 6. In Design view, select the Main form. Go to the events list in the Properties window, and double-click 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 if (e.CloseReason == CloseReason.UserClosing) { e.Cancel = true; this.Hide(); }
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If you want to learn more about why a form is closing, you can search the Help system for CloseReason enumeration.
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Part of the event is FormClosingEventArgs, which contains the arguments that accompany the event notification as well as the reason why the form is closing.
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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 clicks the Exit item in 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. 7. You ll now add the code for the Open... menu choice. To write the code for this event, click cmsNotify in the component tray, and then double-click the Open... menu choice on the content 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 Restore code. You will write code to make sure the form has the focus so that it ends up on top of any other windows that are displayed. Add the following code to the tsmiOpen_Click event handler:
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35 private void tsmiOpen_Click(object sender, EventArgs e) 36 { 37 38 39 } this.Restore(); this.Focus();
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