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Activate Public Methods Close ShowDialog Closing Public Events Deactivate Load
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FORM CLASS HIERARCHY
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On to our friend the Form class. This class can be used for just about any application window, including borderless, floating, and dialog box windows. The Control class we discussed in chapter 4 provides a number of useful members for dealing with forms. For example, the Width and Height properties determine the size of the form, the DisplayRectangle property holds the drawable area of the form, and the Cursor property gets or sets the current cursor to display. A number of common events such as Click, KeyDown, MouseUp, and Paint are also inherited from this class. Scrolling, of course, is provided by the ScrollableControl class. An overview of the members specific to the Form class is shown in .NET Table 7.2. Once you have perused the Form overview and memorized its contents, go on to the next section where we will make some practical use of some of these members.
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Well, we are ready to utilize the Form class members, but where to begin We will avoid dialog boxes and other new windows for the time being, and stick with the single form in our application. A good first topic we can cover here is drawing on a form. As we have seen, drawing in .NET is performed using the System.Drawing namespace. We used classes from this namespace in chapter 4 when we created an owner-drawn status bar panel. Here, we continue to use the Graphics class for drawing, but will make use of some alternate members. Before we can do this, we need a place to draw. To generate such a place, we will remove the PictureBox object from our application.
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DELETING THE PICTUREBOX CONTROL Beside the need for a place to draw, the PictureBox control just isn t working out here. Like the Load button before it, it is just the wrong control for the task at hand. In chapter 2 we saw how this control stretched and distorted our image, and in chapter 3 we saw that scrolling was not supported when the displayed image exceeded the size of the control. So, it was nice while it lasted, but off it goes.1 Let s get this task out of the way so we can draw with a somewhat freer hand.
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It is, in fact, possible to extend the PictureBox control to provide this support. You can override the Paint event to draw an image with the proper aspect ratio much like we do in this chapter, and scroll bars can be added using the ScrollBar class. We do not take this approach here since we want to discuss forms and panels, so the PictureBox control is no longer needed. 15 displays a properly proportioned image within a PictureBox control, and chapter 18 provides a short discussion on how to create a custom control incorporating this functionality.
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Set the version number of the MyPhotos application to 7 .2. DELETE THE PICTUREBOX CONTROL Action 1 2 Display the MainForm.cs [Design] window. Delete the PictureBox control.
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Result
The control no longer appears on the form. In the MainForm.cs file, the definition for the control (the pbxPhoto variable) and all references to it in the InitializeComponent method are removed. Note: nonautomated references to this variable must be removed by hand. This will be done during the course of this section.
Select the Delete item from the control s context menu, or simply click on the control and press the Delete key.
With this task completed, our way is clear to implement the functionality previously provided by the PictureBox control in our MainForm control directly. 7.2.2 HANDLING THE IMAGE MENU One of the unfortunate but necessary side effects of nuking the PictureBox control is that our processing of the Image menu no longer makes sense. We built this with the PictureBoxSizeMode enumeration values in mind. Since we are no longer using this control, we need to change how our menu works. As an alternative solution, we will create our own enumerator for this purpose to use in place of the PictureBoxSizeMode enumeration. We could provide a long discussion of the individual changes required here, but this is chapter 7 so we ll just plunge ahead. In this section we ll create the new enumeration and begin the process of modifying our menu handlers. The subsequent sections will address issues specific to the child menu items of the Image menu, and complete our implementation of the menu handlers.
REPLACE THE MODEMENUARRAY MEMBER Action 1 In the MainForm.cs file, delete the modeMenuArray and _selectedImageMode fields. Result
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