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In this last demo, we show you how to add a menu bar to a window. Suppose we want to add the File menu at the top menu bar, as you find in most applications. We want to include a single item in this File menu, the Save entry. We also want to have a shortcut key for this entry, which is CTRL-S, as in most applications. We'll just pop up a message box to confirm the menu item selection.
We add this feature on top of what we showed in Page 6. Windows forms support two relevant classes: MainMenu and MenuItem. A menu item in Windows forms needs three variables:
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We call these variables menuMain, menuFile, and menuSave. We define them as follows:
var menuMain : System.Windows.Forms.MainMenu; var menuFile : System.Windows.Forms.MenuItem; var menuSave : System.Windows.Forms.MenuItem;
We initialize a menu system from the bottom up. We first initialize menuSave, then menuFile, and finally menuMain. Here is the definition of menuSave:
menuSave = new System.Windows.Forms.MenuItem(); menuSave.add_Click(menuSave_Clicked); menuSave.Text = "Save"; menuSave.ShowShortcut = true; menuSave.Shortcut = "CtrlS";
The event handler of a Click event is menuSave_Clicked. We just pop up a message box as a response to the Click event:
private function menuSave_Clicked(o : Object, e : EventArgs) { MessageBox.Show("We should save the file now"); }
We continue with the initialization of menuFile. We can now add the previously-initialized menuSave:
menuFile = new System.Windows.Forms.MenuItem(); menuFile.MenuItems.Add(menuSave); menuFile.Text = "File"; menuFile.ShowShortcut = false;
We finish the menu creation by initializing the top menu bar and adding menuFile to it:
menuMain = new System.Windows.Forms.MainMenu(); menuMain.MenuItems.Add(menuFile);
The package name is MenuPkg and the class name is MenuCls. We pop up the windows form by calling Application.Run():
Application.Run(new MenuPkg.MenuCls());
You should get the following window:
Next: source code of anchors.js
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Created: August 26, 2002
Revised: August 26, 2002
URL: http://www.webreference.com/js/column117/7.html
