GtkSharp/doc/en/Gtk/TreeSelection.xml

<Type Name="TreeSelection" FullName="Gtk.TreeSelection">
  <TypeSignature Language="C#" Maintainer="Lee Mallabone" Value="public class TreeSelection : GLib.Object" />
  <AssemblyInfo>
    <AssemblyName>gtk-sharp</AssemblyName>
    <AssemblyPublicKey>
    </AssemblyPublicKey>
    <AssemblyVersion>2.0.0.0</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>The selection object for <see cref="T:Gtk.TreeView" />.</summary>
    <remarks>
      <para>TreeSelection provides a single class for managing selection information on the List/Tree widget.</para>
      <para>A TreeSelection object is automatically created when a new <see cref="T:Gtk.TreeView" /> widget is created and is inherently tied to it. A TreeSelection cannot exist independently of a <see cref="T:Gtk.TreeView" />. Selection information is retrieved from the <see cref="T:Gtk.TreeView" /> with the <see cref="P:Gtk.TreeView.Selection" /> property.</para>
      <para>TreeSelection can check the selection status of the tree, as well as select and deselect individual rows. Selection is done completely on the view. As a result, multiple views of the same model can have completely different selections. Additionally, you cannot change the selection of a row that is not currently displayed by the view without expanding its parents first.</para>
      <para>One of the important things to remember when monitoring the selection of a view is that the <see cref="E:Gtk.TreeSelection.Changed" /> event is mostly a hint. For example, it may only fire once when a range of rows is selected. It may also fire when nothing has happened, such as when <see cref="M:Gtk.TreeSelection.SelectPath(Gtk.TreePath)" /> is called on a row that is already selected.</para>
    </remarks>
    <example>
      <code lang="C#">
using System;
using Gtk;
 
class Selection
{
        static void Main ()
        {
                Application.Init ();
                Window win = new Window ("TreeSelection sample");
                win.DeleteEvent += OnWinDelete;
 
                TreeView tv = new TreeView ();
                tv.AppendColumn ("Items", new CellRendererText (), "text", 0);
 
                ListStore store = new ListStore (typeof (string));
                store.AppendValues ("item 1");
                store.AppendValues ("item 2");
                tv.Model = store;
 
                tv.Selection.Changed += OnSelectionChanged;
 
                win.Add (tv);
                win.ShowAll ();
                Application.Run ();
        }
 
        static void OnSelectionChanged (object o, EventArgs args)
        {
                TreeIter iter;
                TreeModel model;
 
                if (((TreeSelection)o).GetSelected (out model, out iter))
                {
                        string val = (string) model.GetValue (iter, 0);
                        Console.WriteLine ("{0} was selected", val);
                }
        }
 
        static void OnWinDelete (object o, DeleteEventArgs args)
        {
                Application.Quit ();
        }
}
	  </code>
    </example>
  </Docs>
  <Base>
    <BaseTypeName>GLib.Object</BaseTypeName>
  </Base>
  <Interfaces>
  </Interfaces>
  <Members>
    <Member MemberName="SelectPath">
      <MemberSignature Language="C#" Value="public void SelectPath (Gtk.TreePath path);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="path" Type="Gtk.TreePath" />
      </Parameters>
      <Docs>
        <summary>Selects the specified row that <paramref name="path" /> represents.</summary>
        <param name="path">A row to be selected.</param>
        <remarks />
      </Docs>
    </Member>
    <Member MemberName="PathIsSelected">
      <MemberSignature Language="C#" Value="public bool PathIsSelected (Gtk.TreePath path);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="path" Type="Gtk.TreePath" />
      </Parameters>
      <Docs>
        <summary>Determines whether a <see cref="T:Gtk.TreePath" /> has been selected in this <see cref="T:TreeView" />.</summary>
        <param name="path">The path to a node whose selected status should be checked.</param>
        <returns>
          <see langword="true" /> if <paramref name="path" /> is selected, <see langword="false" /> otherwise.</returns>
        <remarks />
      </Docs>
    </Member>
    <Member MemberName="UnselectIter">
      <MemberSignature Language="C#" Value="public void UnselectIter (Gtk.TreeIter iter);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="iter" Type="Gtk.TreeIter" />
      </Parameters>
      <Docs>
        <summary>Deselects the specified position in the tree.</summary>
        <param name="iter">The tree position that should be deselected.</param>
        <remarks>
          <para>See also, <see cref="M:Gtk.TreeSelection.UnselectPath(Gtk.TreePath)" /> and <see cref="M:Gtk.TreeSelection.UnselectAll()" />.</para>
        </remarks>
        <example>
          <code language="C#">
using System;
using Gtk;
 
class TreeSelectionSample
{
	Label selected;
 
	static void Main ()
	{
		Application.Init ();
		new TreeSelectionSample ();
		Application.Run ();
	}
																				   
	TreeSelectionSample ()
	{
		Window win = new Window ("TreeView selection sample");
		win.SetDefaultSize (400, 300);
		win.DeleteEvent += new DeleteEventHandler (OnWinDelete);

		HBox hbox = new HBox (false, 0);
			 
		TreeView tv = new TreeView ();
		tv.Selection.Changed += new EventHandler (OnSelectionChanged);
		tv.AppendColumn ("items", new CellRendererText (), "text", 0);
								  
		TreeStore store = new TreeStore (typeof (string));
		for (int i = 0; i &lt; 10; i++)
		{
			store.AppendValues ("item " + i.ToString ());
		}
																   
		tv.Model = store;
																	    
		hbox.PackStart (tv);
													 
		selected = new Label ();
		hbox.PackStart (selected);
																	  
		win.Add (hbox);
		win.ShowAll ();
	}
																   
	void OnSelectionChanged (object o, EventArgs args)
	{
		TreeSelection ts = (TreeSelection) o;
		TreeIter iter;
		TreeModel model;
		ts.GetSelected (out model, out iter);
																	    
		selected.Text = (string) model.GetValue (iter, 0);
	}
																	 
	void OnWinDelete (object o, DeleteEventArgs args)
	{
		Application.Quit ();
	}
}
		</code>
        </example>
      </Docs>
    </Member>
    <Member MemberName="IterIsSelected">
      <MemberSignature Language="C#" Value="public bool IterIsSelected (Gtk.TreeIter iter);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="iter" Type="Gtk.TreeIter" />
      </Parameters>
      <Docs>
        <summary>Determine if the iter is selected.</summary>
        <param name="iter">The tree location to check</param>
        <returns>
          <see langword="true" /> if the tree node specified by <paramref name="iter" /> is selected, <see langword="false" /> otherwise.</returns>
        <remarks>
          <para>See also <see cref="M:Gtk.TreeSelection.PathIsSelected(Gtk.TreePath)" />.</para>
        </remarks>
      </Docs>
    </Member>
    <Member MemberName="SelectAll">
      <MemberSignature Language="C#" Value="public void SelectAll ();" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>Selects every node in this <see cref="T:Gtk.TreeView" />.</summary>
        <remarks>
          <para>The <see cref="P:Gtk.TreeSelection.Mode" /> must be set to <see cref="P:Gtk.SelectionMode.Multiple" /> for this method to work.</para>
        </remarks>
      </Docs>
    </Member>
    <Member MemberName="UnselectPath">
      <MemberSignature Language="C#" Value="public void UnselectPath (Gtk.TreePath path);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="path" Type="Gtk.TreePath" />
      </Parameters>
      <Docs>
        <summary>Deselects the tree node that <paramref name="path" /> refers to.</summary>
        <param name="path">A node in the tree.</param>
        <remarks>
          <para>See also <see cref="M:Gtk.TreeSelection.UnselectIter(Gtk.TreeIter)" />.</para>
        </remarks>
      </Docs>
    </Member>
    <Member MemberName="SelectRange">
      <MemberSignature Language="C#" Value="public void SelectRange (Gtk.TreePath start_path, Gtk.TreePath end_path);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="start_path" Type="Gtk.TreePath" />
        <Parameter Name="end_path" Type="Gtk.TreePath" />
      </Parameters>
      <Docs>
        <summary>Selects all the nodes that appear between <paramref name="start_path" /> and <paramref name="end_path" />.</summary>
        <param name="start_path">The first node to select on the tree.</param>
        <param name="end_path">The last node to select on the tree.</param>
        <remarks />
      </Docs>
    </Member>
    <Member MemberName="UnselectAll">
      <MemberSignature Language="C#" Value="public void UnselectAll ();" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>Sets all nodes in the <see cref="T:Gtk.TreeView" /> as unselected.</summary>
        <remarks />
      </Docs>
    </Member>
    <Member MemberName="SelectedForeach">
      <MemberSignature Language="C#" Value="public void SelectedForeach (Gtk.TreeSelectionForeachFunc func);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="func" Type="Gtk.TreeSelectionForeachFunc" />
      </Parameters>
      <Docs>
        <summary>Invokes the delegate passed in by <paramref name="func" /> for each selected row in the <see cref="T:Gtk.TreeView" />.</summary>
        <param name="func">The delegate that should be called for each selected row.</param>
        <remarks>
          <para>This method is useful when the <see cref="P:Gtk.TreeSelection.Mode" /> of this TreeSelection is set to <see cref="P:Gtk.Selection.Multiple" />. It is currently the only way to access selection information for multiple rows. See the class overview for an example on how to effectively use this method for selection tracking.</para>
        </remarks>
      </Docs>
    </Member>
    <Member MemberName="SetSelectFunction" Deprecated="true">
      <MemberSignature Language="C#" Value="public void SetSelectFunction (Gtk.TreeSelectionFunc func, IntPtr data, Gtk.DestroyNotify destroy);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="func" Type="Gtk.TreeSelectionFunc" />
        <Parameter Name="data" Type="System.IntPtr" />
        <Parameter Name="destroy" Type="Gtk.DestroyNotify" />
      </Parameters>
      <Docs>
        <summary>Add a hook into selection and unselection.</summary>
        <param name="func">A delegate to invoke before a node is (un)selected.</param>
        <param name="data">ignored</param>
        <param name="destroy">ignored</param>
        <remarks>This method is obsolete.  New code should use the <see cref="M:Gtk.TreeSelection.SelectFunction" /> property.</remarks>
      </Docs>
    </Member>
    <Member MemberName="SelectFunction">
      <MemberSignature Language="C#" Value="public Gtk.TreeSelectionFunc SelectFunction { set; };" />
      <MemberType>Property</MemberType>
      <ReturnValue>
        <ReturnType>Gtk.TreeSelectionFunc</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>A hook into selection and unselection</summary>
        <value>a <see cref="T:Gtk.TreeSelectionFunc" /></value>
        <remarks>
          <para>If set, <paramref name="func" /> is called before any node is selected or unselected, giving some control over which nodes are selected. The select function should return <see langword="true" /> if the state of the node may be toggled, and <see langword="false" /> if the state of the node should be left unchanged.</para>
        </remarks>
        <since version="Gtk# 2.4" />
      </Docs>
    </Member>
    <Member MemberName="SelectIter">
      <MemberSignature Language="C#" Value="public void SelectIter (Gtk.TreeIter iter);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="iter" Type="Gtk.TreeIter" />
      </Parameters>
      <Docs>
        <summary>Selects the specified <see cref="T:Gtk.TreeIter" />.</summary>
        <param name="iter">Indicates which row to select.</param>
        <remarks>
          <para>See also <see cref="M:Gtk.TreeSelection.SelectAll()" /> and <see cref="M:Gtk.TreeSelection.SelectPath(Gtk.TreePath)" />.</para>
        </remarks>
      </Docs>
    </Member>
    <Member MemberName=".ctor">
      <MemberSignature Language="C#" Value="public TreeSelection (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="Mode">
      <MemberSignature Language="C#" Value="public Gtk.SelectionMode Mode { set; get; };" />
      <MemberType>Property</MemberType>
      <ReturnValue>
        <ReturnType>Gtk.SelectionMode</ReturnType>
      </ReturnValue>
      <Parameters>
      </Parameters>
      <Docs>
        <summary>Manages the way rows can be selected.</summary>
        <value>The current mode dictating selection behaviour.</value>
        <remarks>
          <para>Rows may be deselected by changing this property. For example, if <see cref="P:Gtk.SelectionMode.Multiple" /> rows are selected and the mode is changed to <see cref="P:Gtk.SelectionMode.Single" /> or <see cref="P:Gtk.SelectionMode.Browse" />.</para>
        </remarks>
      </Docs>
    </Member>
    <Member MemberName="UserData">
      <MemberSignature Language="C#" Value="public IntPtr UserData { get; };" />
      <MemberType>Property</MemberType>
      <ReturnValue>
        <ReturnType>System.IntPtr</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>Get the data associated with the <see cref="T:Gtk.TreeSelectionFunc" /> that has been setup for this <see cref="T:Gtk.TreeSelection" />.</summary>
        <value>The raw data that was set when <see cref="M:Gtk.TreeSelection.SetSelectFunction(Gtk.TreeSelectionFunc,System.IntPtr,Gtk.DestroyNotify)" /> was called.</value>
        <remarks />
      </Docs>
    </Member>
    <Member MemberName="TreeView">
      <MemberSignature Language="C#" Value="public Gtk.TreeView TreeView { get; };" />
      <MemberType>Property</MemberType>
      <ReturnValue>
        <ReturnType>Gtk.TreeView</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>Get the <see cref="T:Gtk.TreeView" /> that this <see cref="T:Gtk.TreeSelection" /> is associated with.</summary>
        <value>The <see cref="T:Gtk.TreeView" /> that this <see cref="T:Gtk.TreeSelection" /> is tied to.</value>
        <remarks>
          <para>A <see cref="T:Gtk.TreeSelection" /> object can only be retrieved from a <see cref="T:Gtk.TreeView" />. That is done with its <see cref="P:Gtk.TreeView.Selection" /> property.</para>
        </remarks>
      </Docs>
    </Member>
    <Member MemberName="Changed">
      <MemberSignature Language="C#" Value="public event EventHandler Changed;" />
      <MemberType>Event</MemberType>
      <ReturnValue>
        <ReturnType>System.EventHandler</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>Fired when the selection (may have) changed.</summary>
        <remarks>
          <para>This event is mostly a hint. It may only be fired once when a range of rows are selected, and it may occasionally be fired when nothing has happened.</para>
        </remarks>
      </Docs>
      <Attributes>
        <Attribute>
          <AttributeName>GLib.Signal(CName="changed")</AttributeName>
        </Attribute>
      </Attributes>
    </Member>
    <Member MemberName="UnselectRange">
      <MemberSignature Language="C#" Value="public void UnselectRange (Gtk.TreePath start_path, Gtk.TreePath end_path);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="start_path" Type="Gtk.TreePath" />
        <Parameter Name="end_path" Type="Gtk.TreePath" />
      </Parameters>
      <Docs>
        <summary>Unselects everything between one path and another.</summary>
        <param name="start_path">
          <see cref="T:Gtk.TreePath" /> to begin range.</param>
        <param name="end_path">
          <see cref="T:Gtk.TreePath" /> to end range.</param>
        <remarks />
      </Docs>
    </Member>
    <Member MemberName="CountSelectedRows">
      <MemberSignature Language="C#" Value="public int CountSelectedRows ();" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Int32</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>Get the number of selected rows.</summary>
        <returns>The number of selected rows</returns>
        <remarks />
      </Docs>
    </Member>
    <Member MemberName="GetSelected">
      <MemberSignature Language="C#" Value="public bool GetSelected (out Gtk.TreeModel model, out Gtk.TreeIter iter);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="model" Type="Gtk.TreeModel&amp;" RefType="out" />
        <Parameter Name="iter" Type="Gtk.TreeIter&amp;" RefType="out" />
      </Parameters>
      <Docs>
        <summary>Get information about the currently selected node.</summary>
        <param name="model">A convenient accessor to the <see cref="T:Gtk.TreeModel" /> that this TreeSelection's <see cref="T:Gtk.TreeView" /> is associated with.</param>
        <param name="iter">The position that was selected.</param>
        <returns>
          <see langword="true" /> if a row was selected.</returns>
        <remarks>
          <para>This method will not work if the TreeSelection <see cref="P:Gtk.TreeSelection.Mode" /> has been set to <see cref="P:Gtk.SelectionMode.Multiple" />. In that case you should use <see cref="M:Gtk.TreeSelection.SelectedForeach(Gtk.TreeSelectionForEach)" />.</para>
        </remarks>
      </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.TreeSelection" />.</remarks>
      </Docs>
    </Member>
    <Member MemberName="OnChanged">
      <MemberSignature Language="C#" Value="protected virtual void OnChanged ();" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>Default handler for the <see cref="M:Gtk.TreeSelection.Changed" /> event.</summary>
        <remarks>Override this method in a subclass to provide a default handler for the <see cref="M:Gtk.TreeSelection.Changed" /> event.</remarks>
      </Docs>
    </Member>
    <Member MemberName=".ctor">
      <MemberSignature Language="C#" Value="protected TreeSelection (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(Message=null, IsError=False)</AttributeName>
        </Attribute>
      </Attributes>
    </Member>
    <Member MemberName="GetSelectedRows">
      <MemberSignature Language="C#" Value="public Gtk.TreePath[] GetSelectedRows (out Gtk.TreeModel model);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>Gtk.TreePath[]</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="model" Type="Gtk.TreeModel&amp;" RefType="out" />
      </Parameters>
      <Docs>
        <summary>Returns an array of <see cref="T:Gtk.TreePath" />s representing the selected rows.</summary>
        <param name="model">The model the <see cref="T:Gtk.TreeView" /> is bound to.</param>
        <returns>Selected rows in an array of <see cref="T:Gtk.TreePath" />s</returns>
        <remarks />
      </Docs>
    </Member>
    <Member MemberName=".ctor">
      <MemberSignature Language="C#" Value="protected TreeSelection ();" />
      <MemberType>Constructor</MemberType>
      <ReturnValue />
      <Parameters />
      <Docs>
        <summary>Protected constructor.</summary>
        <remarks />
      </Docs>
    </Member>
    <Member MemberName="GetSelectedRows">
      <MemberSignature Language="C#" Value="public Gtk.TreePath[] GetSelectedRows ();" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>Gtk.TreePath[]</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>Returns an array of <see cref="T:Gtk.TreePath" />s representing the selected rows.</summary>
        <returns>Selected rows in an array of <see cref="T:Gtk.TreePath" />s</returns>
        <remarks />
        <since version="Gtk# 2.4" />
      </Docs>
    </Member>
  </Members>
</Type>