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The MouseMove event handler receives a MouseEventArgs parameter containing, among other event data, an X and Y property defining the current coordinates of the mouse pointer in the control s coordinates. We will discuss this and other mouse events in chapter 12, so we will not go into more detail on this handler here. The one other instance when the pixel values must be updated is when the displayed image changes. The easiest place to track this is when the Panel is painted in the pnlPhoto_Paint method. Continuing the previous steps:

CALL UPDATEPIXELDATA WHEN CURRENT PHOTO CHANGES Action 3 Locate the pnlPhoto_Paint method in the MainForm.cs source file. Call UpdatePixelData if a new photo is displayed. Result

Figure 526 Fixture layout (Image courtesy of RQ Construction)

protected void pnlPhoto_Paint(. . .) {

When I m interviewing job applicants, I m looking for smart people who can cope with day-to-day variation In a small company like CogniToy, you can t get too comfortable doing only one task I wouldn t normally ask a programmer to design the color palette for a new title, but a willingness to step up and do whatever task needs doing is pretty important to an entrepreneurial organization Kent Quirk, President, CogniToy

// Update PixelDlg if photo has changed if ((_dlgPixel != null) && (_nPixelDlgIndex != _album.CurrentPosition)) { _nPixelDlgIndex = _album.CurrentPosition; Point p = pnlPhoto.PointToClient( Form.MousePosition); UpdatePixelData(p.X, p.Y); } // Paint the current photo, if any if (_album.Count > 0) { . . . } }

a. If necessary, save any changes to the NextButton.bmp file. b. Click on the Image item in the Properties window. c. Click the button. d. Locate and open the NextButton.bmp file. 3 Modify the Prev button to display its text on the right side and image on the left side of the button.

As you can see, the ImageAlign and TextAlign properties are used to set the location of the image and text within the button area. These take their values from the ContentAlignment enumeration, with all nine possible combinations of Top, Middle, and Bottom with Left, Center, and Right represented. Both properties use the MiddleCenter value by default. Assigning the Image property is a simple matter of locating the desired file in the file system. The source code generated in the InitializeComponent method by this action is rather interesting. Here is an excerpt of the PhotoEditDlg.cs file.

.

private void InitializeComponent() Load the PhotoEditDlg { resources System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(PhotoEditDlg)); . . . this.btnNext = new System.Windows.Forms.Button(); this.btnPrev = new System.Windows.Forms.Button(); . . . // Load a specific bitmap resource // btnNext // this.btnNext.Image = ((System.Drawing.Bitmap) (resources.GetObject("btnNext.Image"))); this.btnNext.ImageAlign = System.Drawing.ContentAlignment.MiddleRight; . . . this.btnNext.Text = "Nex&t"; this.btnNext.TextAlign = System.Drawing.ContentAlignment.MiddleLeft; this.btnNext.Click += new System.EventHandler(this.btnNext_Click); // // btnPrev // this.btnPrev.Image = ((System.Drawing.Bitmap) (resources.GetObject("btnPrev.Image"))); this.btnPrev.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft; . . . }

Figure 527 Duct coordination (Image courtesy of RQ Construction)

You will note that the names of our original files, NextButton.bmp and PrevButton.bmp, do not appear in this listing. Instead, these files are encapsulated in a culture-specific resource for our library. A culture-specific resource is a text string, image, and other language or culture-specific object used in an application, library, dialog, or other construct. The term resource is often used as an abbreviation for such objects. A few comments on the previous code are in order: Visual Studio creates a resource file specifically for the MyPhotoAlbum project. This file is called PhotoEditDlg.resx and appears in the MyPhotoAlbum project directory. When your program is compiled in Visual Studio, this file is compiled into a .resources file based on the fully qualified name of the dialog. The resgen.exe compiler is used to generate resource files from the command line. In our application, the 403