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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>Glade#</title>
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<link rel="stylesheet" type="text/css" href="../../style.css" />
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</head>
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<body>
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2002-11-16 13:05:10 +00:00
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<table>
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<tr>
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<td><img src="icon.png" /></td>
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<td>
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<h1>Glade - Rapid Application Development with Gnome 2</h1>
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2002-11-09 09:05:51 +00:00
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2002-11-16 13:05:10 +00:00
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by Johannes Roith (<a
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href="mailto:johannes@jroith.de">johannes@jroith.de</a>)</td>
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</tr>
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</table>
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2002-11-09 09:05:51 +00:00
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<h3>Introduction</h3>
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In the previous chapter, you learned how create a Gnome GUI. If
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you've worked with Visual Studio, Delphi/Kylix or Visual Basic
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you might be missing the easy way of dragging widgets on
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forms.<br />
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<br />
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You're right, after all, what we want to do is creating good
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applications <u>faster</u> with mono. Development , where the
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programmer gets assistance in non-coding tasks from (visual)
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tools and focuses on the real work is called RAD - Rapid
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Application Development. Gnome offers a set of such technologies,
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known as Glade. <br />
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<br />
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Glade consists of 2 part:<br />
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<ul>
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<li>Glade - a grafical editor to create forms and save them in
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XML files.</li>
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<li>libglade (called Glade# in Gtk#) - a library to load the XML
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at runtime<br />
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and dynamically create the form.</li>
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</ul>
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That means, the user will need have libglade installed, and the
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xml file must be distributed with the application. Glade# is the
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C# binding for libglade and even offers some advanced features -
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like self-contained glade files - that are only available in
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Gtk#.<br />
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<br />
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Language independence has always been a goal in Gnome
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Development. For that reason the Glade Interface Builder exports
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xml, that can be used with any language with glade bindings. This
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benefit is bought with little more effort compared to Visual
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Studio, as the code can't be generated automatically. <br />
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<br />
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<h3>Creating the UI</h3>
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<table cellpadding="5" border="0">
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<tr>
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<td valign="top"><img src="glade-palette.png" border="0" /></td>
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<td valign="top">Before we try to use glade with our Project,
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first get some experience with it. Fire up the Glade Interface
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Designer. You will be greeted by three windows: the main window,
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a properites and a palette window, containing icons. Click
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Project - New and select "Gnome Project".<br />
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<br />
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To create a new window click on the first icon in the
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palette-window. The new window is shown in the list. You can
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modify Type, Position, Caption, and other things in the
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Properties window.<br />
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<br />
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If you want your application to quit, if the window is closed
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you'll have to connect a signal with an event handler. Select
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"Signals" and add a handler for "delete_event" and call it
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"OnWindowDeleteEvent".<br />
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<br />
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Take a button and drop it on the window. As you know, gtk+ has
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the concept of invisible boxes, to position widgets, and for that
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reason the button will fill the whole window. Modify some
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properties and add a signal handler for "clicked" and call it
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"OnButton1Clicked".<br />
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<br />
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Save to a new directory. Glade will put 2 files there:
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[projectname].glade and [projectname].gladep, wich does only save
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some information for the Interface Builder. The "interesting"
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file is the .glade file, that you can open in any text editor.
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It's plain XML and looks like that:<br />
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<br />
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</td>
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<td valign="top"><img src="glade-m.png" border="0" /><br />
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<img src="glade-properties.png" border="0" /></td>
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</tr>
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</table>
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<pre class="code">
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<?xml version="1.0" standalone="no"?> <!--*- mode: xml -*-->
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<!DOCTYPE glade-interface SYSTEM "http://glade.gnome.org/glade-2.0.dtd">
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<glade-interface>
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<widget class="GtkWindow" id="window2">
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<property name="visible">True</property>
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<property name="title" translatable="yes">window2</property>
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<property name="type">GTK_WINDOW_TOPLEVEL</property>
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<property name="window_position">GTK_WIN_POS_NONE</property>
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<property name="modal">False</property>
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<property name="resizable">True</property>
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<property name="destroy_with_parent">False</property>
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<child>
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<widget class="GtkButton" id="button1">
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<property name="border_width">10</property>
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<property name="visible">True</property>
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<property name="can_focus">True</property>
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<property name="label" translatable="yes">button1</property>
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<property name="use_underline">True</property>
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<property name="relief">GTK_RELIEF_NORMAL</property>
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</widget>
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</child>
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</widget>
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</glade-interface>
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</pre>
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<br />
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<h3>It's time to start coding</h3>
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The code is similiar to previous chapters. What has changed is,
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that most of the code is move to the GladeTest constructor.
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That's because the main-method is <b>static</b> and therefor
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doesn't belong to any class. Altough possible, moving code to
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Main() would only lead to more complicated code.<br />
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<pre class="code">
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namespace GladeSamples {
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using System;
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using Gtk;
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using Gnome;
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using Glade;
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using GtkSharp;
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public class GladeTest
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{
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public static void Main (string[] args)
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{
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new GladeTest(args);
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}
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public GladeTest (string[] args)
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{
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Application.Init();
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/* This loads the glade file glade.glade, selects window2 and connects it to the current object,
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* which is the class GladeTest here. */
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<b>Glade.XML gxml = new Glade.XML ("file.glade", "window2", null);
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gxml.Autoconnect (this);</b>
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Application.Run();
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/* If you want to access the glade objects you have to "import" them.
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* This is not required, but else you can only work with the pre-defined signal handlers */
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Button button1 = (Gtk.Button) gxml["button1"];
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button1.BorderWidth=10;
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}
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/* Connect the Signals defined in Glade */
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public void OnWindowDeleteEvent (object o, DeleteEventArgs args)
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{
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Application.Quit ();
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args.RetVal = true;
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}
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public void OnButton1Clicked (System.Object obj, EventArgs e)
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{
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Console.WriteLine ("Button 1 clicked");
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}
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2002-11-16 13:05:10 +00:00
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}
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}
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</pre>
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<br />
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compile with:
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<table border="0">
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<tr>
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<td><img src="sample1.png" border="border" /></td>
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<td>
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<pre>
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mcs /unsafe -r gtk-sharp.dll -r glade-sharp.dll glade.cs
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</pre>
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</td>
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</tr>
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</table>
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<br />
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Of course, include the Gnome and Glade namespaces.
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<pre class="code">
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using Gnome;
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using Glade;
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</pre>
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2002-11-16 13:05:10 +00:00
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The first part inits the Application.<br />
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Then the glade xml file is connected. The first param is the
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file, the second the main widget (here: the window). The second
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line connects gxml to the current object.
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<pre class="code">
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Glade.XML gxml = new Glade.XML ("file.glade", "window2", null);
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gxml.Autoconnect (this);
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</pre>
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2002-11-16 13:05:10 +00:00
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Altough glade will show all widgets and cares about the events
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defined, most likely you will want to change properties, or add
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events during the runtime. For that to work you have to connect a
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new object to the glade widget. This example also sets the
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BorderWidth.
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<pre class="code">
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Button button1 = (Gtk.Button) gxml["button1"];
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button1.BorderWidth=10;
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</pre>
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2002-11-16 13:05:10 +00:00
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That's it.<br />
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<br />
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<h3>Available Widgets</h3>
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All available widgets are devided in 4 categories. If you want
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your application to be independent of gnome and portable to
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windows, or Mac OS X, use only Gtk+ and Gtk+ Additional. If you
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don't need that flexibility I strongly encourage you to make also
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use of the Gnome category. That includes Font-Selector, Druids,
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Iconlists and other useful things.<br />
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<br />
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Glade can be extened, for example gnome-db extensions are
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available.
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<h3>Using Glade in our Project</h3>
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After explaining how it works, like in the other chapters we want
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to go on with our little Project, introducing the new learned
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technology and extending the knowledge. This chapter removes the
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few UI bits, done by hand and adds an Interface using Glade.
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<br />
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<br />
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[TODO] <br />
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<br />
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<h3>Didn't you say something about this self-contained
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thing?</h3>
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Yes, I did. And it's quite a good feature. Now, that we're using
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Glade our application consists not only of 1, but 2 files.
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Luckily, the CLR has a way, to embedd any file in the executable,
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like images or text files. Glade offer an additional constructor
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to load the glade file from a resource, so you don't have to
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distribute it. The only difference is the "null" before the
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filename.
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<pre class="code">
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Glade.XML gxml = new Glade.XML (<b>null</b>, "file.glade", "window2", null);
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gxml.Autoconnect (this);
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</pre>
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You have then to compile the file in, with the resource switch.
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<pre>
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mcs /unsafe /resource:glade.glade -r gtk-sharp.dll -r glade-sharp.dll glade.cs
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</pre>
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</body>
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</html>
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