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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//
using MS.Win32;
using System.Windows.Media;
using System.Windows.Input;
using SR = MS.Internal.PresentationCore.SR;
namespace System.Windows.Interop
{
/// <summary>
/// Base class for HwndSource Creation Parameters.
/// This allows flexibility and control of parameters to HwndSource's
/// Constructor without many different overloaded constructors.
/// </summary>
public struct HwndSourceParameters
{
/// <summary>
/// Simple Ctor w/ just a WindowName
/// </summary>
public HwndSourceParameters(string name): this()
{
// Initialize some fields to useful default values
_styleBits = NativeMethods.WS_VISIBLE;
_styleBits |= NativeMethods.WS_CAPTION;
_styleBits |= NativeMethods.WS_SYSMENU;
_styleBits |= NativeMethods.WS_THICKFRAME;
_styleBits |= NativeMethods.WS_MINIMIZEBOX;
_styleBits |= NativeMethods.WS_MAXIMIZEBOX;
_styleBits |= NativeMethods.WS_CLIPCHILDREN;
// The Visual Manager has a hard time creating
// a surface with zero pixels.
_width = 1;
_height = 1;
_x = NativeMethods.CW_USEDEFAULT;
_y = NativeMethods.CW_USEDEFAULT;
WindowName = name;
}
/// <summary>
/// Ctor. w/ WindowName and Size.
/// </summary>
/// <param name="name"> Name of the window </param>
/// <param name="width"> Width of the window </param>
/// <param name="height"> Height of the window </param>
public HwndSourceParameters(string name, int width, int height): this(name)
{
Width = width;
Height = height;
}
/// <summary>
/// Returns the hashcode for this struct.
/// </summary>
/// <returns>hashcode</returns>
public override int GetHashCode( )
{
return base.GetHashCode();
}
/// <summary>
/// The Window Class Style Property
/// </summary>
public int WindowClassStyle
{
get{ return _classStyleBits; }
set{ _classStyleBits = value; }
}
/// <summary>
/// Allow the app to set the Style bits.
/// The Clip Children bit must always be set on a Standard Window.
/// </summary>
public int WindowStyle
{
get{
return _styleBits;
}
set{
_styleBits = value | NativeMethods.WS_CLIPCHILDREN;
}
}
/// <summary>
/// The Extended Style bits.
/// </summary>
public int ExtendedWindowStyle
{
get{ return _extendedStyleBits; }
set{ _extendedStyleBits = value; }
}
/// <summary>
/// Set the X,Y Position of HwndSource Creation Parameters.
/// </summary>
public void SetPosition(int x, int y)
{
_x = x;
_y = y;
}
/// <summary>
/// The X position of the HwndSource Property.
/// </summary>
public int PositionX
{
get{ return _x; }
set{ _x = value; }
}
/// <summary>
/// The Y position of the HwndSource Property.
/// </summary>
public int PositionY
{
get{ return _y; }
set{ _y = value; }
}
/// <summary>
/// Set the Width and Height of HwndSource Creation Parameters.
/// </summary>
public void SetSize(int width, int height)
{
_width = width;
_height = height;
_hasAssignedSize = true;
}
/// <summary>
/// The Width Property of the HwndSource.
/// </summary>
public int Width
{
get{ return _width; }
set{
_width = value;
_hasAssignedSize = true;
}
}
/// <summary>
/// The Height Property of the HwndSource.
/// </summary>
public int Height
{
get{ return _height; }
set{
_height = value;
_hasAssignedSize = true;
}
}
/// <summary>
/// Was the Size assigned or did we just default.
/// </summary>
public bool HasAssignedSize
{
get { return _hasAssignedSize; }
}
/// <summary>
/// The Window Name Property.
/// </summary>
public string WindowName
{
get{ return _name; }
set{ _name = value; }
}
/// <summary>
/// The ParentWindow Property.
/// </summary>
public IntPtr ParentWindow
{
get{ return _parent; }
set{ _parent = value; }
}
/// <summary>
/// The HwndSourceHook Property. This allows a message hook to
/// process window messages to the window. A Hook provided in the
/// HwndSourceParameters will be installed before the call to
/// CreateWindow and this hook will see the window creation msgs.
/// </summary>
public HwndSourceHook HwndSourceHook
{
get{ return _hwndSourceHook; }
set{ this._hwndSourceHook = value; }
}
/// <summary>
/// The size that an HwndSource uses for layout purposes is
/// normally the size of the client area. However, top-level
/// windows may want to use the size of the entire window,
/// including the non-client area, for layout purposes. This
/// allows properties such as Width and Height to reflect the
/// size of the entire window.
/// </summary>
public bool AdjustSizingForNonClientArea
{
get { return _adjustSizingForNonClientArea; }
set { _adjustSizingForNonClientArea = value; }
}
/// <summary>
/// Whether or not the ancestors of an HwndSource should
/// be considered as non-client area.
/// </summary>
/// <remarks>
/// Used in conjunction with the AdjustSizingForNonClientArea
/// setting. XAML Browser Applications use this to enable
/// passing the size of the browser application itself to
/// layout.
/// </remarks>
public bool TreatAncestorsAsNonClientArea
{
get { return _treatAncestorsAsNonClientArea; }
set { _treatAncestorsAsNonClientArea = value; }
}
/// <summary>
/// Specifies whether or not the per-pixel opacity of the window content
/// is respected.
/// </summary>
/// <remarks>
/// By enabling per-pixel opacity, the system will no longer draw the non-client area.
/// This property is deprecated: UsesPerPixelTransparency should be used instead.
/// </remarks>
public bool UsesPerPixelOpacity
{
get {return _usesPerPixelOpacity;}
set { _usesPerPixelOpacity = value; }
}
/// <summary>
/// Specifies whether or not the per-pixel transparency of the window content
/// is respected.
/// </summary>
/// <remarks>
/// By enabling per-pixel transparency, the system will no longer draw the non-client area.
/// On Windows 7, this property can only be set for toplevel Windows
/// On Windows 8, this property can be set also for child Windows
/// </remarks>
public bool UsesPerPixelTransparency
{
get { return _usesPerPixelTransparency; }
set { _usesPerPixelTransparency = value; }
}
/// <summary>
/// The RestoreFocusMode for the window.
/// </summary>
public RestoreFocusMode RestoreFocusMode
{
get { return _restoreFocusMode ?? Keyboard.DefaultRestoreFocusMode; }
set { _restoreFocusMode = value; }
}
/// <summary>
/// The AcquireHwndFocusInMenuMode setting for the window.
/// </summary>
public bool AcquireHwndFocusInMenuMode
{
get { return _acquireHwndFocusInMenuMode ?? HwndSource.DefaultAcquireHwndFocusInMenuMode; }
set { _acquireHwndFocusInMenuMode = value; }
}
/// <summary>
/// Whether an HwndSource should be given messages straight off the
/// message loop to preprocess, like top-level ones do normally.
/// </summary>
/// <remarks> Used for RootBrowserWindow. </remarks>
public bool TreatAsInputRoot
{
get { return _treatAsInputRoot ?? ((uint)_styleBits & NativeMethods.WS_CHILD) == 0; }
set { _treatAsInputRoot = value; }
}
/// <summary>
/// Returns the effective per pixel opacity property given the style and the underlying platform
/// </summary>
/// <remarks>
/// Before Windows 8, Layered child windows were not possible and UsesPerPixelOpacity was ignored when
/// WS_CHILD was used. For compatibility reasons:
/// - we introduce UsesPerPixelTransparency which can be set for WS_CHILD windows
/// - we mark as deprecated but still honor UsesPerPixelOpacity
/// </remarks>
internal bool EffectivePerPixelOpacity
{
get
{
if (_usesPerPixelTransparency)
{
// Applications aware of the new property should not set the old one too
if (_usesPerPixelOpacity)
{
throw new InvalidOperationException(SR.UsesPerPixelOpacityIsObsolete);
}
// If not running on Windows 8, we must clear the parameter for child windows
return PlatformSupportsTransparentChildWindows || ((WindowStyle & NativeMethods.WS_CHILD) == 0);
}
else
{
// Application does not want transparency or else uses old API
// In the second case, we do not support WS_CHILD
return _usesPerPixelOpacity && ((WindowStyle & NativeMethods.WS_CHILD) == 0);
}
}
}
/// <summary>
/// == operator
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
/// <returns></returns>
public static bool operator==(HwndSourceParameters a, HwndSourceParameters b)
{
return a.Equals(b);
}
/// <summary>
/// != operator
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
/// <returns></returns>
public static bool operator!=(HwndSourceParameters a, HwndSourceParameters b)
{
return !a.Equals(b);
}
/// <summary>
/// Compare two HwndSourceParameters blocks.
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
public override bool Equals(object obj)
{
if (obj == null)
{
return false;
}
return Equals( (HwndSourceParameters)obj );
}
/// <summary>
/// Compare two HwndSourceParameters blocks.
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
public bool Equals(HwndSourceParameters obj)
{
return ((this._classStyleBits == obj._classStyleBits)
&& (this._styleBits == obj._styleBits)
&& (this._extendedStyleBits == obj._extendedStyleBits)
&& (this._x == obj._x)
&& (this._y == obj._y)
&& (this._width == obj._width)
&& (this._height == obj._height)
&& (this._name == obj._name)
&& (this._parent == obj._parent)
&& (this._hwndSourceHook == obj._hwndSourceHook)
&& (this._adjustSizingForNonClientArea == obj._adjustSizingForNonClientArea)
&& (this._hasAssignedSize == obj._hasAssignedSize)
// && (this._colorKey == obj._colorKey)
// && (this._opacity == obj._opacity)
// && (this._opacitySpecified == obj._opacitySpecified)
&& (this._usesPerPixelOpacity == obj._usesPerPixelOpacity)
&& (this._usesPerPixelTransparency == obj._usesPerPixelTransparency)
);
}
private int _classStyleBits;
private int _styleBits;
private int _extendedStyleBits;
private int _x;
private int _y;
private int _width;
private int _height;
private string _name;
private IntPtr _parent;
private HwndSourceHook _hwndSourceHook;
private bool _adjustSizingForNonClientArea;
private bool _hasAssignedSize;
// private Nullable<Color> _colorKey;
// private double _opacity;
// private bool _opacitySpecified; // default value for opacity needs to be 1.0
private bool _usesPerPixelOpacity;
private bool _usesPerPixelTransparency;
private bool? _treatAsInputRoot;
private bool _treatAncestorsAsNonClientArea;
private RestoreFocusMode? _restoreFocusMode;
private bool? _acquireHwndFocusInMenuMode;
private static bool _platformSupportsTransparentChildWindows = MS.Internal.Utilities.IsOSWindows8OrNewer;
/// <summary>
/// Transparent Child Windows are only supported on Windows 8 or later
/// </summary>
internal static bool PlatformSupportsTransparentChildWindows
{
get
{
return _platformSupportsTransparentChildWindows;
}
}
/// <summary>
/// Only used in HwndSourceParameters tests to simulate old platforms behavior
/// </summary>
/// <param name="value">boolean indicating which support to emulate</param>
/// <remarks>Not intended to be tested outside test code</remarks>
internal static void SetPlatformSupportsTransparentChildWindowsForTestingOnly(bool value)
{
if (string.Equals(System.Reflection.Assembly.GetEntryAssembly().GetName().Name, "drthwndsource", StringComparison.CurrentCultureIgnoreCase))
{
_platformSupportsTransparentChildWindows = value;
}
}
}
}
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