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switch (_selectedMode) Draw image in { client window case DisplayMode.StretchToFit: // Fill the entire window with the image g.DrawImage(photo.Image, this.DisplayRectangle); break; case DisplayMode.ActualSize: break; } // Update the status bar. sbpnlFileName.Text = photo.FileName; sbpnlFileIndex.Text = String.Format("{0:#}/{1:#}", _album.CurrentIndex+1, _album.Count); sbpnlImageSize.Text = String.Format("{0:#} x {1:#}", photo.Image.Width, photo.Image.Height); statusBar1.ShowPanels = true; } else { // Indicate the album is empty e.Graphics.Clear(SystemColors.Control); statusBar1.Text = "No Photos in Album"; statusBar1.ShowPanels = false; } statusBar1.Invalidate(); base.OnPaint(e); }

Part I:

Notice that the constructor is specified as public This is because the constructor will be called from code defined outside of its class This constructor assigns the instance variable x of MyClass the value 10 This constructor is called by new when an object is created For example, in the line

Your application should now compile and run. Load an image, and it should look similar to figure 7.2 shown at the start of this section. The following points are worth noting in our implementation of the OnPaint method. The OnPaint method takes a single PaintEventArgs parameter. We did not discuss this parameter in chapter 6, but a brief mention is warranted here, and an overview is provided in .NET Table 7.3. This class is similar in purpose to the DrawItemEventArgs class presented in chapter 4. The two classes are similar, except that the Paint event and PaintEventArgs class are used for controls, while

MyClass t1 = new MyClass();

the DrawItem event and DrawItemEventArgs class are used for drawing components or other objects within a control. The Graphics.DrawImage method is used to draw the current photograph in the window. The image is drawn into the area represented by the Form.DisplayRectangle property rather than the ClipRectangle area provided by the PaintEventArgs parameter. This is because ClipRectangle only represents the area that requires updating, which may not be the entire window. In our case, we need to redraw the entire image to account for changes in the display mode or the size of the drawable area. When an empty album is present, we draw over any image data that may still be present in the window. The Graphics.Clear method performs this task by painting a single color onto the form. The SystemColors class provides access to the user-definable desktop colors, with the Control property representing the default background color for 3-D controls. Our application has now taken a step backward. The Stretch to Fit option by definition distorts the image displayed, so the behavior we have here is the same as we saw before. In addition, we have lost our nice border around the image, and resizing the form no longer works. The border is simply cosmetic and will be addressed in due course toward the end of this chapter. This distortion problem we will address immediately. The resize issue can wait until after the next section.

the constructor MyClass( ) is called on the t1 object, giving t1x the value 10 The same is true for t2 After construction, t2x has the value 10 Thus, the output from the program is

10 10

The PaintEventArgs class defines the event data required by the Paint event. This class inherits from the System.EventArgs class, and is part of the System.Windows.Forms namespace. ClipRectangle Public Properties Graphics Gets the Rectangle representing the area of the object that needs to be painted. This property is read-only. Gets the Graphics to use when painting the object.

In the preceding example, a parameterless constructor was used While this is fine for some situations, most often you will need a constructor that accepts one or more parameters Parameters are added to a constructor in the same way they are added to a method: just declare them inside the parentheses after the constructor s name For example, here MyClass is given a parameterized constructor: