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The three tasks related to building projects planning, design, and construction are often considered together, because they all occur in a relatively short time just before the occupancy of a facility During the middle ages in western Europe, all three of these tasks were managed by the master builder a single person who planned, managed, and executed the project for an owner This position evolved into the architect s role in later ages The plans for most projects were communicated from the master builder s mind to the owners and builders by means of scale models as well as direct personal instructions At that time the entire project team worked on the construction site, and construction documents, as we know them today, did not exist yet The master builder would instruct the workers verbally and by demonstration, manage all administrative needs, and guide all aspects of the construction process Many prototype details

private void pictureBoxMain_Paint (object sender, System.Windows. Forms.PaintEventArgs e) { Photograph photo = pictureBoxMain.Tag as Photograph; if (photo == null) { // Something is wrong, give up e.Graphics.Clear(pictureBoxMain. BackColor); return; } // Paint the photograph Rectangle rect = photo.ScaleToFit( pictureBoxMain.ClientRectangle); e.Graphics.DrawImage(photo.Image, rect); e.Graphics.DrawRectangle(borderPen, rect); }

a. Retrieve the Photograph object stored in the picture box. b. If a photograph is not found, simply clear the client area. c. Otherwise, use the ScaleToFit method to determine the proper drawing rectangle. d. Draw the assigned image into this rectangle. e. Draw a border around the image using the Pen object created in the previous step.

DISPLAY PHOTOGRAPH IN A PICTUREBOX CONTROL (continued) Action 5 Update the AfterSelect event handler to use the new DisplayPhoto method to ensure the proper control is visible. Result

At long, long last a year or even two years after that initial, brilliant idea the game is ready to be manufactured and go out to the distributor or retailers At this point, it has gone gold in industry jargon

private void treeViewMain_AfterSelect(. . .) { . . . if (node.Parent == null) { // Bad tag or top-level node. LoadAlbumData(fileName); DisplayPhoto(null); } else if (Path.GetExtension(fileName) . . .) { // Album node selected PhotoAlbum album = OpenTreeAlbum(. . .); LoadPhotoData(album); DisplayPhoto(null); } else // must be a photograph { // Clear the list and display the photo listViewMain.Clear(); DisplayPhoto(node); } } private void pictureBoxMain_Resize (object sender, System.EventArgs e) { // Force the entire control to repaint pictureBoxMain.Invalidate(); }

Add a Resize event handler for the PictureBox control to force the control to redraw the entire image when it is resized.

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As we mentioned at the start of this section, we will not spend much time discussing these changes, since they leverage concepts and features we have seen before. Let s move on to editing a tree node s label. 15.5.2 SUPPORTING LABEL EDITS Tree nodes can be edited in a manner similar to list items. There is a BeginEdit method in the TreeNode class to initiate a label edit programmatically, and BeforeLabelEdit and AfterLabelEdit events in the TreeView class that occur before and after the user edits the label. Event handlers for these events receive the NodeLabelEditEventArgs class for the event parameter. This class is summarized in .NET Table 15.5, and is manipulated in much the same way as we saw for the LabelEditEventArgs class when handling label events for the ListView class.

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The NodeLabelEditEventArgs class represents the event data associated with the BeforeLabelEdit and AfterLabelEdit events in the TreeView class. This class is part of the System.Windows.Forms namespace, and inherits from the System.EventArgs class. CancelEdit Gets or sets whether the edit operation should be cancelled. This property can be set both before and after the node is edited. Gets the new text to assign to the label of the indicated node. Gets the TreeNode object being edited.

In our application, we will permit nodes to be edited using the menuEditLabel menu item, or by pressing the F2 key when a tree node is selected and the tree view has the focus. The following table details the steps required for this change:

SUPPORT EDITING OF TREE NODE LABELS Action 1 Set the LabelEdit property for the TreeView control to true in the MainForm.cs [Design] window. Handle the KeyDown event for the TreeView control to initiate a label edit when the F2 key is pressed in the tree control. Result Tree node labels may now be edited.