GtkSharp/doc/en/Gtk/Application.xml

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<Type Name="Application" FullName="Gtk.Application">
<TypeSignature Language="C#" Value="public class Application" Maintainer="John Luke" />
<AssemblyInfo>
<AssemblyName>gtk-sharp</AssemblyName>
<AssemblyPublicKey>
</AssemblyPublicKey>
<AssemblyVersion>2.10.0.0</AssemblyVersion>
</AssemblyInfo>
<ThreadSafetyStatement>Gtk# is thread aware, but not thread safe; See the <link location="node:gtk-sharp/programming/threads">Gtk# Thread Programming</link> for details.</ThreadSafetyStatement>
<Docs>
<summary>Application class</summary>
<remarks>
<para>
Provides the initialization and event loop iteration related
methods for the Gtk# widget library. Since Gtk# is an event
driven toolkit, Applications register callbacks against various
events to handle user input. These callbacks are invoked from
the main event loop when events are detected.
</para>
<example>
<code lang="C#">
using Gtk;
using System;
using GLib;
public class HelloWorld {
public static int Main (string[] args)
{
Application.Init ();
Gtk.Window win = new Gtk.Window ("Gtk# Hello World");
win.DeleteEvent += new DeleteEventHandler (Window_Delete);
win.ShowAll ();
Application.Run ();
return 0;
}
static void Window_Delete (object obj, DeleteEventArgs args)
{
SignalArgs sa = (SignalArgs) args;
Application.Quit ();
sa.RetVal = true;
}
}
</code>
</example>
</remarks>
</Docs>
<Base>
<BaseTypeName>System.Object</BaseTypeName>
</Base>
<Interfaces />
<Members>
<Member MemberName="Quit">
<MemberSignature Language="C#" Value="public static void Quit ();" />
<MemberType>Method</MemberType>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Quits the current main loop</summary>
<remarks>
<para>
Makes the innermost invocation of the main loop return when it regains control.
</para>
</remarks>
</Docs>
</Member>
<Member MemberName="RunIteration">
<MemberSignature Language="C#" Value="public static void RunIteration ();" />
<MemberType>Method</MemberType>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Runs a single iteration of the main loop.</summary>
<remarks>
<para>
Runs a single iteration of the main loop. If no events are
waiting to be processed Gtk# will block until the next
event is noticed. If you do not want to block look at <see cref="M:Gtk.Application.RunIteration(System.Boolean)" /> or check if
any events are pending with <see cref="M:Gtk.Application.EventsPending()" /> first.
</para>
</remarks>
</Docs>
</Member>
<Member MemberName="EventsPending">
<MemberSignature Language="C#" Value="public static bool EventsPending ();" />
<MemberType>Method</MemberType>
<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Whether there are events on the queue</summary>
<returns>
<see langword="true" /> if events are available to be processed, <see langword="false" /> otherwise</returns>
<remarks>
<para>
Checks if any events are pending. This can be used to
update the GUI and invoke timeouts etc. while doing some
time intensive computation.
</para>
<example>
<code lang="C#">
void LongComputation ()
{
while (!done){
ComputationChunk ();
// Flush pending events to keep the GUI reponsive
while (Application.EventsPending ())
Application.RunIteration ();
}
}
</code>
</example>
</remarks>
</Docs>
</Member>
<Member MemberName="Run">
<MemberSignature Language="C#" Value="public static void Run ();" />
<MemberType>Method</MemberType>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Runs the main loop</summary>
<remarks>
<para>
Runs the main loop until <see cref="M:Gtk.Application.Quit()" /> is called. You can nest
calls to <see cref="M:Gtk.Application.Run()" />. In that
case <see cref="M:Gtk.Application.Quit()" /> will make the
innermost invocation of the main loop return.
</para>
</remarks>
</Docs>
</Member>
<Member MemberName="Init">
<MemberSignature Language="C#" Value="public static void Init ();" />
<MemberType>Method</MemberType>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Initializes GTK+ for operation.</summary>
<remarks>
<para>
Call this function before using any other Gtk# functions
in your GUI applications. It will initialize everything
needed to operate the toolkit.
</para>
<para>
This function will terminate your program if it was unable
to initialize the GUI for some reason. If you want your
program to fall back to a textual interface you want to
call <see cref="M:Gtk.Application.InitCheck(System.String, System.String []&amp;)" /> instead.
</para>
<para>
If you want to pass arguments from the command line use
the <see cref="T:Gtk.Application.Init(System.String, System.String []&amp;)" />
method instead.
</para>
</remarks>
</Docs>
</Member>
<Member MemberName="RunIteration">
<MemberSignature Language="C#" Value="public static bool RunIteration (bool blocking);" />
<MemberType>Method</MemberType>
<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="blocking" Type="System.Boolean" />
</Parameters>
<Docs>
<summary>Runs a single iteration of the main loop.</summary>
<param name="blocking">A boolean value, whether the iteration should block or not</param>
<remarks>
<para>
Runs a single iteration of the main loop. If <paramref name="blocking" /> is <see langword="true" />, then if no events are
waiting to be processed Gtk# will block until the next event is noticed; If <paramref name="blocking" /> is <see langword="false" />,
then it if no events are waiting to be processed Gtk#, routine will return immediately.
</para>
</remarks>
<returns>
<see langword="true" /> if <see cref="M:Gtk.Application.Quit()" /> has been called in the innermost main loop.</returns>
</Docs>
</Member>
<Member MemberName="CurrentEvent">
<MemberSignature Language="C#" Value="public static Gdk.Event CurrentEvent { get; };" />
<MemberType>Property</MemberType>
<ReturnValue>
<ReturnType>Gdk.Event</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Returns the event currently taking place.</summary>
<value>a <see cref="T:Gdk.Event" /></value>
<remarks />
</Docs>
</Member>
<Member MemberName="Init">
<MemberSignature Language="C#" Value="public static void Init (string progname, ref string[] args);" />
<MemberType>Method</MemberType>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="progname" Type="System.String" />
<Parameter Name="args" Type="System.String[]&amp;" RefType="ref" />
</Parameters>
<Docs>
<param name="progname">The name of the program.</param>
<param name="args">An string array with the parameters given to the program.</param>
<summary>Call this method before using any other GTK# method in your GUI applications.</summary>
<remarks>
<para>
It will initialize everything needed to operate the toolkit and parses some standard command line options, <paramref name="args" /> is adjusted accordingly so your code will never see those standard arugments.
</para>
<para>
Note that there are some alternative ways to initialize GTK#, if you are calling <see cref="M:Gtk.Global.ParseArgs" /> or <see cref="M:Gtk.Application.InitCheck" /> you don't have to call <see cref="M:Gtk.Application.Init" />.
</para>
</remarks>
</Docs>
</Member>
<Member MemberName="InitCheck">
<MemberSignature Language="C#" Value="public static bool InitCheck (string progname, ref string[] args);" />
<MemberType>Method</MemberType>
<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="progname" Type="System.String" />
<Parameter Name="args" Type="System.String[]&amp;" RefType="ref" />
</Parameters>
<Docs>
<param name="progname">The name of the program.</param>
<param name="args">An string array with the parameters given to the program.</param>
<summary>This method does the same work as <see cref="M:Gtk.Application.Init" /> with only a single change, it does not terminate the program if the GUI can't be initialized. Instead it returns <see langword="false" /> on failure.</summary>
<returns>
<see langword="" /> if the GUI has been succesfully initialized, otherwise <see langword="false" />.</returns>
<remarks>This way the application can fall back to some toher means of communication with the user, for example a curses or command line interface.</remarks>
</Docs>
</Member>
<Member MemberName="Invoke">
<MemberSignature Language="C#" Value="public static void Invoke (EventHandler d);" />
<MemberType>Method</MemberType>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="d" Type="System.EventHandler" />
</Parameters>
<Docs>
<param name="d">An event handler to invoke on the main thread.</param>
<summary>Invoke the given EventHandler in the GUI thread.</summary>
<remarks>
Use this method to invoke the given delegate code in the
main thread. This is necessary since Gtk# does not allow
multiple threads to perform operations on Gtk objects as it
the toolkit is not thread-safe.
<para>
This mechanism is simpler to use than <see cref="T:Gtk.ThreadNotify" /> since it does not require the
creation of a notifier per event.
</para><para>
This is particularly useful with C# 2.0 as it is possible
to use anonymous methods with it, for example:
</para><example>
<code lang="C#">
using Gtk;
using Gdk;
using System;
using System.Threading;
public class HelloThreads {
static Label msg;
static Button but;
static int count;
static Thread thr;
public static int Main (string[] args)
{
Application.Init ();
Gtk.Window win = new Gtk.Window ("Gtk# Threaded Counter");
win.DeleteEvent += new DeleteEventHandler (Window_Delete);
msg = new Label ("Click to quit");
but = new Button (msg);
but.Clicked += delegate { thr.Abort (); Application.Quit (); };
win.Add (but);
win.ShowAll ();
thr = new Thread (ThreadMethod);
thr.Start ();
Application.Run ();
return 0;
}
static void ThreadMethod ()
{
Console.WriteLine ("Starting thread");
while (true){
count++;
Thread.Sleep (500);
Application.Invoke (delegate {
msg.Text = String.Format ("Click to Quit ({0})", count);
});
}
}
static void Window_Delete (object obj, DeleteEventArgs args)
{
Application.Quit ();
args.RetVal = true;
}
</code>
</example></remarks>
</Docs>
</Member>
<Member MemberName="Invoke">
<MemberSignature Language="C#" Value="public static void Invoke (object sender, EventArgs args, EventHandler d);" />
<MemberType>Method</MemberType>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="sender" Type="System.Object" />
<Parameter Name="args" Type="System.EventArgs" />
<Parameter Name="d" Type="System.EventHandler" />
</Parameters>
<Docs>
<param name="sender">The sender to pass to the event handler..</param>
<param name="args">The argument to pass to the event handler.</param>
<param name="d">An event handler to invoke on the main thread.</param>
<summary>Invoke the given EventHandler in the GUI thread.</summary>
<remarks>
Use this method to invoke the given delegate code in the
main thread. This is necessary since Gtk# does not allow
multiple threads to perform operations on Gtk objects as it
the toolkit is not thread-safe.
<para>
This mechanism is simpler to use than <see cref="T:Gtk.ThreadNotify" /> since it does not require the
creation of a notifier per event.
</para><para>
This is particularly useful with C# 2.0 as it is possible
to use anonymous methods with it, for example:
</para><example>
<code lang="C#">
using Gtk;
using Gdk;
using System;
using System.Threading;
public class HelloThreads {
static Label msg;
static Button but;
static int count;
static Thread thr;
public static int Main (string[] args)
{
Application.Init ();
Gtk.Window win = new Gtk.Window ("Gtk# Threaded Counter");
win.DeleteEvent += new DeleteEventHandler (Window_Delete);
msg = new Label ("Click to quit");
but = new Button (msg);
but.Clicked += delegate { thr.Abort (); Application.Quit (); };
win.Add (but);
win.ShowAll ();
thr = new Thread (ThreadMethod);
thr.Start ();
Application.Run ();
return 0;
}
static void ThreadMethod ()
{
Console.WriteLine ("Starting thread");
while (true){
count++;
Thread.Sleep (500);
Application.Invoke (delegate {
msg.Text = String.Format ("Click to Quit ({0})", count);
});
}
}
static void Window_Delete (object obj, DeleteEventArgs args)
{
Application.Quit ();
args.RetVal = true;
}
</code>
</example></remarks>
</Docs>
</Member>
</Members>
</Type>