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//---------------------------------------------------------------------------
//
// <copyright file="ResizeGrip.cs" company="Microsoft">
// Copyright (C) Microsoft Corporation. All rights reserved.
// </copyright>
//
// Description: Implements the ResizeGrip control
//
// History
// 10/24/03 hamidm Created
//
//---------------------------------------------------------------------------
using System;
using System.Diagnostics;
using System.Windows;
using System.Windows.Threading;
using System.Windows.Media;
using System.Windows.Shapes;
#if OLD_AUTOMATION
using System.Windows.Automation.Provider;
#endif
namespace System.Windows.Controls.Primitives
{
/// <summary>
/// The ResizeGrip control enables the Window object to have a resize grip. This control should be
/// made part of the Window's style visual tree.
/// </summary>
/// <remarks>
///
/// </remarks>
#if OLD_AUTOMATION
[Automation(AccessibilityControlType = "Thumb")]
#endif
public class ResizeGrip : Control
{
//----------------------------------------------
//
// Constructors
//
//----------------------------------------------
#region Constructors
static ResizeGrip()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(ResizeGrip), new FrameworkPropertyMetadata(typeof(ResizeGrip)));
_dType = DependencyObjectType.FromSystemTypeInternal(typeof(ResizeGrip));
Window.IWindowServiceProperty.OverrideMetadata(
typeof(ResizeGrip),
new FrameworkPropertyMetadata(new PropertyChangedCallback(_OnWindowServiceChanged)));
}
/// <summary>
/// Default ResizeGrip constructor
/// </summary>
/// <remarks>
/// Automatic determination of current Dispatcher. Use alternative constructor
/// that accepts a Dispatcher for best performance.
/// </remarks>
public ResizeGrip() : base()
{
}
#endregion Constructors
//----------------------------------------------
//
// Private Methods
//
//----------------------------------------------
#region Private Methods
private static void _OnWindowServiceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
ResizeGrip rg = d as ResizeGrip;
Debug.Assert(rg != null, "DependencyObject must be of type ResizeGrip.");
rg.OnWindowServiceChanged(e.OldValue as Window, e.NewValue as Window);
}
/// <summary>
/// When IWindowService is invalidated, it means that this control is either placed into
/// a window's visual tree or taken out. If we are in a new Window's visual tree, we
/// want to set the reference to this object inside the Window. Window uses this
/// reference in its WM_NCHITTEST code
/// </summary>
private void OnWindowServiceChanged(Window oldWindow, Window newWindow)
{
if ((oldWindow != null) && (oldWindow != newWindow))
{
oldWindow.ClearResizeGripControl(this);
}
if (newWindow != null)
{
newWindow.SetResizeGripControl(this);
}
}
#region DTypeThemeStyleKey
// Returns the DependencyObjectType for the registered ThemeStyleKey's default
// value. Controls will override this method to return approriate types.
internal override DependencyObjectType DTypeThemeStyleKey
{
get { return _dType; }
}
private static DependencyObjectType _dType;
#endregion DTypeThemeStyleKey
//
// This property
// 1. Finds the correct initial size for the _effectiveValues store on the current DependencyObject
// 2. This is a performance optimization
//
internal override int EffectiveValuesInitialSize
{
get { return 28; }
}
#endregion Private Methods
}
}
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