GtkSharp/doc/en/Gtk/IMContext.xml

<Type Name="IMContext" FullName="Gtk.IMContext">
  <TypeSignature Language="C#" Maintainer="auto" Value="public class IMContext : GLib.Object" />
  <AssemblyInfo>
    <AssemblyName>gtk-sharp</AssemblyName>
    <AssemblyPublicKey>
    </AssemblyPublicKey>
    <AssemblyVersion>2.12.0.0</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>A base class for input method contexts.</summary>
    <remarks />
  </Docs>
  <Base>
    <BaseTypeName>GLib.Object</BaseTypeName>
  </Base>
  <Interfaces>
  </Interfaces>
  <Members>
    <Member MemberName="FocusIn">
      <MemberSignature Language="C#" Value="public void FocusIn ();" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary> Notify the input method that the widget to which this 
	  input context corresponds has gained focus. The input method
	  may, for example, change the displayed feedback to reflect
	  this change.</summary>
        <remarks />
      </Docs>
    </Member>
    <Member MemberName="FocusOut">
      <MemberSignature Language="C#" Value="public void FocusOut ();" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>Notify the input method that the widget to which this
	  input context corresponds has lost focus. The input method
	  may, for example, change the displayed feedback or reset the contexts
	  state to reflect this change.
	</summary>
        <remarks />
      </Docs>
    </Member>
    <Member MemberName="DeleteSurrounding">
      <MemberSignature Language="C#" Value="public bool DeleteSurrounding (int offset, int n_chars);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="offset" Type="System.Int32" />
        <Parameter Name="n_chars" Type="System.Int32" />
      </Parameters>
      <Docs>
        <summary>
	  Asks the widget that the input context is attached to to delete
	  characters around the cursor position by emitting the
	  <see cref="E:Gtk.IMContext.DeleteSurrounding" /> signal. 
	</summary>
        <param name="offset">a <see cref="T:System.Int32" /></param>
        <param name="n_chars">a <see cref="T:System.Int32" /></param>
        <returns>a <see cref="T:System.Boolean" />, <see langword="true" /> if the signal was handled.</returns>
        <remarks>
          <para>
	    Note that <paramref name="offset" /> and <paramref name="n_chars" />
	    are in characters not in bytes, which differs from the usage other
	    places in <see cref="T:Gtk.IMContext" />.
	  </para>
          <para>
	    In order to use this function, you should first call
	    <see cref="M:Gtk.IMContext.GetSurrounding" />
	    to get the current context, and
	    call this function immediately afterwards to make sure that you
	    know what you are deleting. You should also account for the fact
	    that even if the signal was handled, the input context might not
	    have deleted all the characters that were requested to be deleted.
	  </para>
          <para>
	    This function is used by an input method that wants to make
	    subsitutions in the existing text in response to new input. It is
	    not useful for applications.
	  </para>
        </remarks>
      </Docs>
    </Member>
    <Member MemberName="FilterKeypress">
      <MemberSignature Language="C#" Value="public bool FilterKeypress (Gdk.EventKey evnt);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="evnt" Type="Gdk.EventKey" />
      </Parameters>
      <Docs>
        <summary>Allow an input method to handle a <see cref="T:Gdk.EventKey" />.</summary>
        <param name="evnt">a <see cref="T:Gdk.EventKey" /> representing a key press.</param>
        <returns>
          <see langword="true" /> if the keypress was handled.</returns>
        <remarks>If the method returns <see langword="true" />, no further processing should be done for <paramref name="evnt" />.</remarks>
      </Docs>
    </Member>
    <Member MemberName="Reset">
      <MemberSignature Language="C#" Value="public void Reset ();" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>Resets the state of the input method.</summary>
        <remarks>Call this method if, for example, a change in cursor position has occurred.  The reset clears any existing pre-edit state.</remarks>
      </Docs>
    </Member>
    <Member MemberName=".ctor">
      <MemberSignature Language="C#" Value="public IMContext (IntPtr raw);" />
      <MemberType>Constructor</MemberType>
      <ReturnValue />
      <Parameters>
        <Parameter Name="raw" Type="System.IntPtr" />
      </Parameters>
      <Docs>
        <summary>Internal constructor</summary>
        <param name="raw">Pointer to the C object.</param>
        <remarks>
          <para>This is an internal constructor, and should not be used by user code.</para>
        </remarks>
      </Docs>
    </Member>
    <Member MemberName="ClientWindow">
      <MemberSignature Language="C#" Value="public Gdk.Window ClientWindow { set; };" />
      <MemberType>Property</MemberType>
      <ReturnValue>
        <ReturnType>Gdk.Window</ReturnType>
      </ReturnValue>
      <Parameters>
      </Parameters>
      <Docs>
        <summary>
	  Set the client window for the input context; this is the
	  <see cref="T:Gdk.Window" /> in which the input appears. 
	</summary>
        <value>a <see cref="T:Gdk.Window" /></value>
        <remarks>
	  The client window is
	  used in order to correctly position status windows. It may
	  also be used for purposes internal to the input method.
	</remarks>
      </Docs>
    </Member>
    <Member MemberName="CursorLocation">
      <MemberSignature Language="C#" Value="public Gdk.Rectangle CursorLocation { set; };" />
      <MemberType>Property</MemberType>
      <ReturnValue>
        <ReturnType>Gdk.Rectangle</ReturnType>
      </ReturnValue>
      <Parameters>
      </Parameters>
      <Docs>
        <summary>
	  Notify the input method that a change in cursor 
	  position has been made. 
	</summary>
        <value>a <see cref="T:Gdk.Rectangle" /></value>
        <remarks>
	  The location is relative to the client window.
	</remarks>
      </Docs>
    </Member>
    <Member MemberName="UsePreedit">
      <MemberSignature Language="C#" Value="public bool UsePreedit { set; };" />
      <MemberType>Property</MemberType>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Parameters>
      </Parameters>
      <Docs>
        <summary>
	  Whether the IM context should use the preedit string
	  to display feedback. 
	</summary>
        <value>a <see cref="T:System.Boolean" /></value>
        <remarks>
	  If <paramref name="use_preedit" /> is <see langword="false" /> (default
	  is <see langword="true" />), then the IM context may use some other method to display
	  feedback, such as displaying it in a child of the root window.
	</remarks>
      </Docs>
    </Member>
    <Member MemberName="PreeditChanged">
      <MemberSignature Language="C#" Value="public event EventHandler PreeditChanged;" />
      <MemberType>Event</MemberType>
      <ReturnValue>
        <ReturnType>System.EventHandler</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>Event raised when the preedit string is changed.</summary>
        <remarks />
      </Docs>
      <Attributes>
        <Attribute>
          <AttributeName>GLib.Signal("preedit_changed")</AttributeName>
        </Attribute>
      </Attributes>
    </Member>
    <Member MemberName="PreeditStart">
      <MemberSignature Language="C#" Value="public event EventHandler PreeditStart;" />
      <MemberType>Event</MemberType>
      <ReturnValue>
        <ReturnType>System.EventHandler</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>Event raised when pre-editing is started.</summary>
        <remarks />
      </Docs>
      <Attributes>
        <Attribute>
          <AttributeName>GLib.Signal("preedit_start")</AttributeName>
        </Attribute>
      </Attributes>
    </Member>
    <Member MemberName="SurroundingDeleted">
      <MemberSignature Language="C#" Value="public event Gtk.SurroundingDeletedHandler SurroundingDeleted;" />
      <MemberType>Event</MemberType>
      <ReturnValue>
        <ReturnType>Gtk.SurroundingDeletedHandler</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>Event raised when the input method needs to delete the context text.</summary>
        <remarks />
      </Docs>
      <Attributes>
        <Attribute>
          <AttributeName>GLib.Signal("delete_surrounding")</AttributeName>
        </Attribute>
      </Attributes>
    </Member>
    <Member MemberName="Commit">
      <MemberSignature Language="C#" Value="public event Gtk.CommitHandler Commit;" />
      <MemberType>Event</MemberType>
      <ReturnValue>
        <ReturnType>Gtk.CommitHandler</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>Commit text event.</summary>
        <remarks>The event is emitted when the input method has processed all the keystrokes for an individual text element, including pre-edit keystrokes.  The resulting text is located in <see cref="M:Gtk.CommitArgs.Str" /></remarks>
      </Docs>
      <Attributes>
        <Attribute>
          <AttributeName>GLib.Signal("commit")</AttributeName>
        </Attribute>
      </Attributes>
    </Member>
    <Member MemberName="RetrieveSurrounding">
      <MemberSignature Language="C#" Value="public event Gtk.RetrieveSurroundingHandler RetrieveSurrounding;" />
      <MemberType>Event</MemberType>
      <ReturnValue>
        <ReturnType>Gtk.RetrieveSurroundingHandler</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>
	  Event raised when the input method requires the context surrounding the cursor. 
	</summary>
        <remarks />
      </Docs>
      <Attributes>
        <Attribute>
          <AttributeName>GLib.Signal("retrieve_surrounding")</AttributeName>
        </Attribute>
      </Attributes>
    </Member>
    <Member MemberName="PreeditEnd">
      <MemberSignature Language="C#" Value="public event EventHandler PreeditEnd;" />
      <MemberType>Event</MemberType>
      <ReturnValue>
        <ReturnType>System.EventHandler</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>Event raised when pre-editing is completed.</summary>
        <remarks />
      </Docs>
      <Attributes>
        <Attribute>
          <AttributeName>GLib.Signal("preedit_end")</AttributeName>
        </Attribute>
      </Attributes>
    </Member>
    <Member MemberName="SetSurrounding">
      <MemberSignature Language="C#" Value="public void SetSurrounding (string text, int cursor_index);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="text" Type="System.String" />
        <Parameter Name="cursor_index" Type="System.Int32" />
      </Parameters>
      <Docs>
        <summary>
	  Sets surrounding context around the insertion point and preedit string. 
	</summary>
        <param name="text">a <see cref="T:System.String" /></param>
        <param name="cursor_index">a <see cref="T:System.Int32" /></param>
        <remarks>
	  This function is expected to be called in response to the 
	  <see cref="E:Gtk.IMContext.RetrieveSurrounding" /> event,
	  and it will likely have no effect if called at other times.
	</remarks>
      </Docs>
    </Member>
    <Member MemberName="GetSurrounding">
      <MemberSignature Language="C#" Value="public bool GetSurrounding (out string text, out int cursor_index);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="text" Type="System.String&amp;" RefType="out" />
        <Parameter Name="cursor_index" Type="System.Int32&amp;" RefType="out" />
      </Parameters>
      <Docs>
        <summary>Gets the context around the insertion point.</summary>
        <param name="text">a <see cref="T:System.String" /></param>
        <param name="cursor_index">a <see cref="T:System.Int32" /></param>
        <returns>a <see cref="T:System.Boolean" /></returns>
        <remarks>
          <para>
	    Input methods typically want context in order to constrain
	    input text based on existing text; this is important for
	    languages such as Thai where only some sequences of
	    characters are allowed.
	  </para>
          <para>
	    This function is implemented by emitting the <see cref="E:Gtk.IMContext.RetrieveSurrounding" /> event on the
	    input method; in response to this signal, a widget should
	    provide as much context as is available, up to an entire
	    paragraph, by calling <see cref="M:Gtk.IMContext.SetSurrounding" />. Note that there
	    is no obligation for a widget to respond to the <see cref="E:Gtk.IMContext.RetrieveSurrounding" /> signal, so
	    input methods must be prepared to function without
	    context.
	</para>
        </remarks>
        <since version="Gtk# 2.4" />
      </Docs>
    </Member>
    <Member MemberName="GType">
      <MemberSignature Language="C#" Value="public static GLib.GType GType { get; };" />
      <MemberType>Property</MemberType>
      <ReturnValue>
        <ReturnType>GLib.GType</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>GType Property.</summary>
        <value>a <see cref="T:GLib.GType" /></value>
        <remarks>Returns the native <see cref="T:GLib.GType" /> value for <see cref="T:Gtk.IMContext" />.</remarks>
      </Docs>
    </Member>
    <Member MemberName="OnPreeditEnd">
      <MemberSignature Language="C#" Value="protected virtual void OnPreeditEnd ();" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>Default handler for the <see cref="M:Gtk.IMContext.PreeditEnd" /> event.</summary>
        <remarks>Override this method in a subclass to provide a default handler for the <see cref="M:Gtk.IMContext.PreeditEnd" /> event.</remarks>
      </Docs>
    </Member>
    <Member MemberName="OnRetrieveSurrounding">
      <MemberSignature Language="C#" Value="protected virtual bool OnRetrieveSurrounding ();" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>Default handler for the <see cref="M:Gtk.IMContext.RetrieveSurrounding" /> event.</summary>
        <returns>a <see cref="T:System.Boolean" /></returns>
        <remarks>Override this method in a subclass to provide a default handler for the <see cref="M:Gtk.IMContext.RetrieveSurrounding" /> event.</remarks>
      </Docs>
    </Member>
    <Member MemberName="OnCommit">
      <MemberSignature Language="C#" Value="protected virtual void OnCommit (string str);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="str" Type="System.String" />
      </Parameters>
      <Docs>
        <summary>Default handler for the <see cref="M:Gtk.IMContext.Commit" /> event.</summary>
        <param name="str">a <see cref="T:System.String" /></param>
        <remarks>Override this method in a subclass to provide a default handler for the <see cref="M:Gtk.IMContext.Commit" /> event.</remarks>
      </Docs>
    </Member>
    <Member MemberName="OnSurroundingDeleted">
      <MemberSignature Language="C#" Value="protected virtual bool OnSurroundingDeleted (int offset, int n_chars);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="offset" Type="System.Int32" />
        <Parameter Name="n_chars" Type="System.Int32" />
      </Parameters>
      <Docs>
        <summary>Default handler for the <see cref="M:Gtk.IMContext.SurroundingDeleted" /> event.</summary>
        <param name="offset">a <see cref="T:System.Int32" /></param>
        <param name="n_chars">a <see cref="T:System.Int32" /></param>
        <returns>a <see cref="T:System.Boolean" /></returns>
        <remarks>Override this method in a subclass to provide a default handler for the <see cref="M:Gtk.IMContext.SurroundingDeleted" /> event.</remarks>
      </Docs>
    </Member>
    <Member MemberName="OnPreeditStart">
      <MemberSignature Language="C#" Value="protected virtual void OnPreeditStart ();" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>Default handler for the <see cref="M:Gtk.IMContext.PreeditStart" /> event.</summary>
        <remarks>Override this method in a subclass to provide a default handler for the <see cref="M:Gtk.IMContext.PreeditStart" /> event.</remarks>
      </Docs>
    </Member>
    <Member MemberName="OnPreeditChanged">
      <MemberSignature Language="C#" Value="protected virtual void OnPreeditChanged ();" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>Default handler for the <see cref="M:Gtk.IMContext.PreeditChanged" /> event.</summary>
        <remarks>Override this method in a subclass to provide a default handler for the <see cref="M:Gtk.IMContext.PreeditChanged" /> event.</remarks>
      </Docs>
    </Member>
    <Member MemberName=".ctor">
      <MemberSignature Language="C#" Value="protected IMContext (GLib.GType gtype);" />
      <MemberType>Constructor</MemberType>
      <ReturnValue />
      <Parameters>
        <Parameter Name="gtype" Type="GLib.GType" />
      </Parameters>
      <Docs>
        <summary>Protected Constructor.</summary>
        <param name="gtype">a <see cref="T:GLib.GType" /></param>
        <remarks>Chain to this constructor if you have manually registered a native <see cref="T:GLib.GType" /> value for your subclass.</remarks>
      </Docs>
      <Attributes>
        <Attribute>
          <AttributeName>System.Obsolete</AttributeName>
        </Attribute>
      </Attributes>
    </Member>
    <Member MemberName="GetPreeditString">
      <MemberSignature Language="C#" Value="public void GetPreeditString (out string str, out Pango.AttrList attrs, out int cursor_pos);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="str" Type="System.String&amp;" RefType="out" />
        <Parameter Name="attrs" Type="Pango.AttrList&amp;" RefType="out" />
        <Parameter Name="cursor_pos" Type="System.Int32&amp;" RefType="out" />
      </Parameters>
      <Docs>
        <param name="str">a <see cref="T:System.String" />, a location to store , the retrieved string.</param>
        <param name="attrs">a <see cref="T:Pango.AttrList" />, location to store the retrieved attribute list.</param>
        <param name="cursor_pos">To be added.</param>
        <summary>
	  Retrieve the current preedit string for the input context
	  and a list of attributes to apply to the string.
	</summary>
        <remarks>
	  This string should be displayed inserted at the insertion
	  point. 
	</remarks>
        <since version="Gtk# 2.4" />
      </Docs>
    </Member>
    <Member MemberName=".ctor">
      <MemberSignature Language="C#" Value="protected IMContext ();" />
      <MemberType>Constructor</MemberType>
      <ReturnValue />
      <Parameters />
      <Docs>
        <summary>Protected Constructor.</summary>
        <remarks />
      </Docs>
    </Member>
  </Members>
</Type>