（转）Creating a GTK notification area icon using Mono and C#

转载自：http://www.dijksterhuis.org/creating-gtk-notification-area-icon-mono/

Cool (Linux) applications have their own icon in the notification area. To add my own icon in the Gnome notification area using Mono only took a few lines of code. In the post below I show how you can add your icon and associate a tooltip and right click menu to it.

 

GTK provides the StatusIcon class to register your own icon in the notification area.

StatusIcon  myStatusIcon;

You can provide and load your own icon, but for this example I used one of the GTK stock icons.

myStatusIcon = StatusIcon.NewFromStock(Stock.Harddisk);  // I use a stock icon from Stock.*
// to avoid having to include an icon file
myStatusIcon.Visible = true;  // Make sure we are displayed

Adding or changing a tooltip is as straighforward as assigning it:

// The message to show when the mouse hovers over the icon
myStatusIcon.Tooltip = "Hello World ToolTip";                     

To create a rightclick menu we need to register the PopupMenu event handler:

 myStatusIcon.PopupMenu += OnStatusIconPopupMenu;         // Link in the right click popup menu
/* The Status Popup menu is shown when the user right clicks on the toolbar icon */

protected void OnStatusIconPopupMenu(object sender, EventArgs e)
{
    Menu popupMenu = new Menu();

    MenuItem helloItem = new MenuItem("About Hello World");
    helloItem.Show();
    helloItem.Activated += new EventHandler(OnHelloAboutActivated);

    popupMenu.Append(helloItem);
    popupMenu.Popup(null,null,null,3,Gtk.Global.CurrentEventTime);
}

And that is really all there is to it. I have included the complete code below. If you create a new GTK solution in MonoDevelop you will end up with two files, Main.cs and MainWindows.Cs. Replace the MainWindow.CS file with the content below:

using System;
using Gtk;

public partial class MainWindow: Gtk.Window
{
    StatusIcon  myStatusIcon;
    AboutDialog aboutDialog;

    public MainWindow (): base (Gtk.WindowType.Toplevel)
    {

        /* The following lines create the notification area status icon */
        /* Make it visible and link in the right click popup menu       */ 

        myStatusIcon = StatusIcon.NewFromStock(Stock.Harddisk);  // I use a stock icon from Stock.*
                                                                 // to avoid having to include an icon file
        myStatusIcon.Tooltip = "Hello World ToolTip";            // The message to show when the mouse hovers over the icon
        myStatusIcon.Visible = true;                             // Make sure we are displayed
        myStatusIcon.PopupMenu += OnStatusIconPopupMenu;         // Link in the right click popup menu 

        /* Not necessary */
        Label AppWindowLabel = new Label("Hello World");
        this.Add(AppWindowLabel);

        Build ();
    }

    /* Called when the main application closes */

    protected void OnDeleteEvent (object sender, DeleteEventArgs a)
    {
        Application.Quit ();
        a.RetVal = true;
    }

    /* The Status Popup menu is shown when the user right clicks on the toolbar icon */

    protected void OnStatusIconPopupMenu(object sender, EventArgs e)
    {
        Menu popupMenu = new Menu();

        MenuItem helloItem = new MenuItem("About Hello World");
        helloItem.Show();
        helloItem.Activated += new EventHandler(OnHelloAboutActivated);

        popupMenu.Append(helloItem);
        popupMenu.Popup(null,null,null,3,Gtk.Global.CurrentEventTime);
    }

    /* If the user select the "About Hello World" menu option, we show the about dialog */

    protected void OnHelloAboutActivated(object sender, EventArgs e)
    {
        aboutDialog = new AboutDialog();

        aboutDialog.ProgramName = "The About Dialog Popup Demo";
        aboutDialog.Version = "1.0beta";
        aboutDialog.Comments = "The best things in life are simple!";
        aboutDialog.License = "Creative Commons";
        aboutDialog.Authors = new string[] { "Martijn Dijksterhuis" };
        aboutDialog.Website = "http://www.dijksterhuis.org";
        aboutDialog.Response += new ResponseHandler(OnHelloAboutClose);

        aboutDialog.Run();
    }

    /* Catch the "Close" and "X" button event from the about dialog box */

    protected void OnHelloAboutClose(object sender, ResponseArgs e)
    {
        if (e.ResponseId==ResponseType.Cancel || e.ResponseId==ResponseType.DeleteEvent)
         aboutDialog.Destroy();
    }

}