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This code uses the same Form.MousePosition method and nonstatic Panel.PointToClient we saw earlier in this section. Our modeless dialog is finished. Compile your code, show your friends, and otherwise verify that the dialog works properly. Note how both the form and the dialog can be manipulated at the same time, and how the dialog behaves when you display the next or previous image in an album, with the mouse cursor both inside and outside the panel control.
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One nice change you could make here is to modify the cursor used for the Panel control to use a small cross-hair rather than the normal arrow. Do this by changing the Cursor property for the Panel class to use the Cross cursor. Another interesting change is to allow the user to hide the PixelDlg window using the main application s menu bars. One way to do this is to modify the Text displayed for the menuPixelData menu to be Hide Pi&xel Data whenever the dialog is displayed and back to Pi&xel Data whenever the dialog is hidden or closed. Set the appropriate menu text in the menuView_Popup handler, and use the Hide method or the Visible property to hide the dialog.
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Before we move on to the next topic, let s give a quick summary of what we covered in this chapter.
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In this chapter we looked at dialog boxes. We began with simple dialogs using the MessageBox class, and then created a custom modal dialog based on the Form class, followed by a custom modeless dialog. Along the way we discussed the difference between modal and modeless dialog boxes, caught potential exceptions when opening and saving our album files, examined the relationship between the Close and Dispose methods, saw how to intercept a closing window using the OnClosing method, and learned how to track the mouse pointer within a panel control. We are not done with dialog boxes. Since our main form is getting rather full, future topics will require dialogs in order to continue this book and expand the capabilities of our program. In particular, the next chapter will create a dialog for both our current album and the individual photos in the album as a way to introduce specific Windows Forms controls in more detail.
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Basic controls
9.1 9.2 9.3 9.4 Form inheritance 264 Labels and text boxes 271 Button classes 290 Recap 313
The .NET Framework provides a number of controls for use in Windows Forms applications. This chapter will introduce the most basic of these, namely the Label, TextBox, Button, RadioButton, and CheckBox controls. These controls date back to the original version of Windows,1 and before that to other graphical environments in other operating systems, so they must be somewhat useful. In practice, labels, text boxes, and the various button types are critical in almost any Windows application, so it is worth spending a little time to see how they are added to and utilized by applications. As usual, we will discuss the classes for these controls in the context of our MyPhotos application. This will require that we do some work on our PhotoAlbum and Photograph classes. Our controls are not very useful unless they can be integrated into an application, so these changes should illustrate how similar constructs can be used in your own applications. In addition, such changes present opportunities to discuss additional concepts such as the .NET DateTime structure and the C# delegate keyword.
List boxes and combo boxes were part of this version as well, but we will leave these controls to the next chapter.
Specific Windows Forms concepts we will cover in this chapter include: Form inheritance: what is it and how do you do it Basic Windows Forms controls: the Label, TextBox, Button, RadioButton, and CheckBox classes. Container controls such as Panel and GroupBox objects. In addition, we will also look at the following related concepts: The C# delegate keyword. The System.DateTime structure. Keyboard and focus events for controls. Using the Control.Tag property. To enable our discussion of all this and more, we will create two modal dialog boxes for our form, shown in the first section as figure 9.1. These will represent various settings the user can modify on an individual photograph or entire album. While we will discuss each control generally, these two dialogs will serve to demonstrate the creation and usage of each control as we move through the chapter. We begin our discussion with form inheritance.
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