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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.
#if RIBBON_IN_FRAMEWORK
namespace System.Windows.Shell
#else
namespace Microsoft.Windows.Shell
#endif
{
using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.InteropServices;
using System.Security;
using System.Threading;
using System.Windows;
using System.Windows.Interop;
using System.Windows.Media;
using System.Windows.Threading;
using Standard;
using HANDLE_MESSAGE = System.Collections.Generic.KeyValuePair<Standard.WM, Standard.MessageHandler>;
internal class WindowChromeWorker : DependencyObject
{
// Delegate signature used for Dispatcher.BeginInvoke.
private delegate void _Action();
#region Fields
private const SWP _SwpFlags = SWP.FRAMECHANGED | SWP.NOSIZE | SWP.NOMOVE | SWP.NOZORDER | SWP.NOOWNERZORDER | SWP.NOACTIVATE;
private readonly List<HANDLE_MESSAGE> _messageTable;
/// <summary>The Window that's chrome is being modified.</summary>
private Window _window;
/// <summary>Underlying HWND for the _window.</summary>
private IntPtr _hwnd;
/// <summary>Underlying HWND for the _window.</summary>
private HwndSource _hwndSource = null;
private bool _isHooked = false;
/// <summary>Object that describes the current modifications being made to the chrome.</summary>
private WindowChrome _chromeInfo;
// Keep track of this so we can detect when we need to apply changes. Tracking these separately
// as I've seen using just one cause things to get enough out of sync that occasionally the caption will redraw.
private WindowState _lastRoundingState;
private WindowState _lastMenuState;
private bool _isGlassEnabled;
#endregion
static WindowChromeWorker()
{
}
public WindowChromeWorker()
{
_messageTable = new List<HANDLE_MESSAGE>
{
new HANDLE_MESSAGE(WM.SETTEXT, _HandleSetTextOrIcon),
new HANDLE_MESSAGE(WM.SETICON, _HandleSetTextOrIcon),
new HANDLE_MESSAGE(WM.NCACTIVATE, _HandleNCActivate),
new HANDLE_MESSAGE(WM.NCCALCSIZE, _HandleNCCalcSize),
new HANDLE_MESSAGE(WM.NCHITTEST, _HandleNCHitTest),
new HANDLE_MESSAGE(WM.NCRBUTTONUP, _HandleNCRButtonUp),
new HANDLE_MESSAGE(WM.SIZE, _HandleSize),
new HANDLE_MESSAGE(WM.WINDOWPOSCHANGED, _HandleWindowPosChanged),
new HANDLE_MESSAGE(WM.DWMCOMPOSITIONCHANGED, _HandleDwmCompositionChanged),
};
}
public void SetWindowChrome(WindowChrome newChrome)
{
VerifyAccess();
Assert.IsNotNull(_window);
if (newChrome == _chromeInfo)
{
// Nothing's changed.
return;
}
if (_chromeInfo != null)
{
_chromeInfo.PropertyChangedThatRequiresRepaint -= _OnChromePropertyChangedThatRequiresRepaint;
}
_chromeInfo = newChrome;
if (_chromeInfo != null)
{
_chromeInfo.PropertyChangedThatRequiresRepaint += _OnChromePropertyChangedThatRequiresRepaint;
}
_ApplyNewCustomChrome();
}
private void _OnChromePropertyChangedThatRequiresRepaint(object sender, EventArgs e)
{
_UpdateFrameState(true);
}
public static readonly DependencyProperty WindowChromeWorkerProperty = DependencyProperty.RegisterAttached(
"WindowChromeWorker",
typeof(WindowChromeWorker),
typeof(WindowChromeWorker),
new PropertyMetadata(null, _OnChromeWorkerChanged));
private static void _OnChromeWorkerChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var w = (Window)d;
var cw = (WindowChromeWorker)e.NewValue;
// The WindowChromeWorker object should only be set on the window once, and never to null.
Assert.IsNotNull(w);
Assert.IsNotNull(cw);
Assert.IsNull(cw._window);
cw._SetWindow(w);
}
private void _SetWindow(Window window)
{
Assert.IsNull(_window);
Assert.IsNotNull(window);
UnsubscribeWindowEvents();
_window = window;
// There are potentially a couple funny states here.
// The window may have been shown and closed, in which case it's no longer usable.
// We shouldn't add any hooks in that case, just exit early.
// If the window hasn't yet been shown, then we need to make sure to remove hooks after it's closed.
_hwnd = new WindowInteropHelper(_window).Handle;
// On older versions of the framework the client size of the window is incorrectly calculated.
// We need to modify the template to fix this on behalf of the user.
Utility.AddDependencyPropertyChangeListener(_window, Window.TemplateProperty, _OnWindowPropertyChangedThatRequiresTemplateFixup);
Utility.AddDependencyPropertyChangeListener(_window, Window.FlowDirectionProperty, _OnWindowPropertyChangedThatRequiresTemplateFixup);
_window.Closed += _UnsetWindow;
// Use whether we can get an HWND to determine if the Window has been loaded.
if (IntPtr.Zero != _hwnd)
{
// We've seen that the HwndSource can't always be retrieved from the HWND, so cache it early.
// Specifically it seems to sometimes disappear when the OS theme is changing.
_hwndSource = HwndSource.FromHwnd(_hwnd);
Assert.IsNotNull(_hwndSource);
_window.ApplyTemplate();
if (_chromeInfo != null)
{
_ApplyNewCustomChrome();
}
}
else
{
_window.SourceInitialized += _WindowSourceInitialized;
}
}
private void _WindowSourceInitialized(object sender, EventArgs e)
{
_hwnd = new WindowInteropHelper(_window).Handle;
Assert.IsNotDefault(_hwnd);
_hwndSource = HwndSource.FromHwnd(_hwnd);
Assert.IsNotNull(_hwndSource);
if (_chromeInfo != null)
{
_ApplyNewCustomChrome();
}
}
private void UnsubscribeWindowEvents()
{
if (_window != null)
{
Utility.RemoveDependencyPropertyChangeListener(_window, Window.TemplateProperty, _OnWindowPropertyChangedThatRequiresTemplateFixup);
Utility.RemoveDependencyPropertyChangeListener(_window, Window.FlowDirectionProperty, _OnWindowPropertyChangedThatRequiresTemplateFixup);
_window.SourceInitialized -= _WindowSourceInitialized;
}
}
private void _UnsetWindow(object sender, EventArgs e)
{
UnsubscribeWindowEvents();
if (_chromeInfo != null)
{
_chromeInfo.PropertyChangedThatRequiresRepaint -= _OnChromePropertyChangedThatRequiresRepaint;
}
_RestoreStandardChromeState(true);
}
[SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")]
public static WindowChromeWorker GetWindowChromeWorker(Window window)
{
Verify.IsNotNull(window, "window");
return (WindowChromeWorker)window.GetValue(WindowChromeWorkerProperty);
}
[SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")]
public static void SetWindowChromeWorker(Window window, WindowChromeWorker chrome)
{
Verify.IsNotNull(window, "window");
window.SetValue(WindowChromeWorkerProperty, chrome);
}
private void _OnWindowPropertyChangedThatRequiresTemplateFixup(object sender, EventArgs e)
{
if (_chromeInfo != null && _hwnd != IntPtr.Zero)
{
// Assume that when the template changes it's going to be applied.
// We don't have a good way to externally hook into the template
// actually being applied, so we asynchronously post the fixup operation
// at Loaded priority, so it's expected that the visual tree will be
// updated before _FixupTemplateIssues is called.
//
// Also see comments in RetryFixupTemplateIssuesOnVisualChildrenAdded which is another
// place where _FixupTemplateIssues is posted.
_window.Dispatcher.BeginInvoke(DispatcherPriority.Loaded, (_Action)_FixupTemplateIssues);
}
}
private void _ApplyNewCustomChrome()
{
if (_hwnd == IntPtr.Zero || _hwndSource.IsDisposed)
{
// Not yet hooked.
return;
}
if (_chromeInfo == null)
{
_RestoreStandardChromeState(false);
return;
}
if (!_isHooked)
{
_hwndSource.AddHook(_WndProc);
_isHooked = true;
}
_FixupTemplateIssues();
// Force this the first time.
_UpdateSystemMenu(_window.WindowState);
_UpdateFrameState(true);
NativeMethods.SetWindowPos(_hwnd, IntPtr.Zero, 0, 0, 0, 0, _SwpFlags);
}
/// <summary>
/// If visual children have been added to <see cref="_window"/>, then repost <see cref="_FixupTemplateIssues"/>
/// </summary>
private void RetryFixupTemplateIssuesOnVisualChildrenAdded(object sender, EventArgs e)
{
if (sender == _window)
{
// Remove the handler for Window.VisualChildrenChanged. This will be hooked up
// again in _FixupTemplatedIssues if needed
_window.VisualChildrenChanged -= RetryFixupTemplateIssuesOnVisualChildrenAdded;
// At this point, the Window and the its root element are ready. Repost _FixupTemplateIssues
// at Render priority to ensure that it gets the root element fixed up ASAP.
//
// Also see comments in _OnWindowPropertyChangedThatRequiresTemplateFixup which is another
// place where _FixupTemplateIssues is posted.
_window.Dispatcher.BeginInvoke(DispatcherPriority.Render, (_Action)_FixupTemplateIssues);
}
}
private void _FixupTemplateIssues()
{
Assert.IsNotNull(_chromeInfo);
Assert.IsNotNull(_window);
if (_window.Template == null)
{
// Nothing to fixup yet. This will get called again when a template does get set.
return;
}
// Guard against the visual tree being empty.
if (VisualTreeHelper.GetChildrenCount(_window) == 0)
{
// The template isn't null, but we don't have a visual tree.
// Wait for the visual tree after ApplyTemplate, and then repost this
_window.VisualChildrenChanged += RetryFixupTemplateIssuesOnVisualChildrenAdded;
return;
}
Thickness templateFixupMargin = default(Thickness);
FrameworkElement rootElement = (FrameworkElement)VisualTreeHelper.GetChild(_window, 0);
if (_chromeInfo.NonClientFrameEdges != NonClientFrameEdges.None)
{
if (Utility.IsFlagSet((int)_chromeInfo.NonClientFrameEdges, (int)NonClientFrameEdges.Top))
{
#if RIBBON_IN_FRAMEWORK
templateFixupMargin.Top -= SystemParameters.WindowResizeBorderThickness.Top;
#else
templateFixupMargin.Top -= SystemParameters2.Current.WindowResizeBorderThickness.Top;
#endif
}
if (Utility.IsFlagSet((int)_chromeInfo.NonClientFrameEdges, (int)NonClientFrameEdges.Left))
{
#if RIBBON_IN_FRAMEWORK
templateFixupMargin.Left -= SystemParameters.WindowResizeBorderThickness.Left;
#else
templateFixupMargin.Left -= SystemParameters2.Current.WindowResizeBorderThickness.Left;
#endif
}
if (Utility.IsFlagSet((int)_chromeInfo.NonClientFrameEdges, (int)NonClientFrameEdges.Bottom))
{
#if RIBBON_IN_FRAMEWORK
templateFixupMargin.Bottom -= SystemParameters.WindowResizeBorderThickness.Bottom;
#else
templateFixupMargin.Bottom -= SystemParameters2.Current.WindowResizeBorderThickness.Bottom;
#endif
}
if (Utility.IsFlagSet((int)_chromeInfo.NonClientFrameEdges, (int)NonClientFrameEdges.Right))
{
#if RIBBON_IN_FRAMEWORK
templateFixupMargin.Right -= SystemParameters.WindowResizeBorderThickness.Right;
#else
templateFixupMargin.Right -= SystemParameters2.Current.WindowResizeBorderThickness.Right;
#endif
}
}
rootElement.Margin = templateFixupMargin;
}
#region WindowProc and Message Handlers
private IntPtr _WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
// Only expecting messages for our cached HWND.
Assert.AreEqual(hwnd, _hwnd);
var message = (WM)msg;
foreach (var handlePair in _messageTable)
{
if (handlePair.Key == message)
{
return handlePair.Value(message, wParam, lParam, out handled);
}
}
return IntPtr.Zero;
}
private IntPtr _HandleSetTextOrIcon(WM uMsg, IntPtr wParam, IntPtr lParam, out bool handled)
{
bool modified = _ModifyStyle(WS.VISIBLE, 0);
// Setting the caption text and icon cause Windows to redraw the caption.
// Letting the default WndProc handle the message without the WS_VISIBLE
// style applied bypasses the redraw.
IntPtr lRet = NativeMethods.DefWindowProc(_hwnd, uMsg, wParam, lParam);
// Put back the style we removed.
if (modified)
{
_ModifyStyle(0, WS.VISIBLE);
}
handled = true;
return lRet;
}
private IntPtr _HandleNCActivate(WM uMsg, IntPtr wParam, IntPtr lParam, out bool handled)
{
// Despite MSDN's documentation of lParam not being used,
// calling DefWindowProc with lParam set to -1 causes Windows not to draw over the caption.
// Directly call DefWindowProc with a custom parameter
// which bypasses any other handling of the message.
IntPtr lRet = NativeMethods.DefWindowProc(_hwnd, WM.NCACTIVATE, wParam, new IntPtr(-1));
handled = true;
return lRet;
}
// Black Border Workaround
//
// 762437 - DWM: Windows that have both clip and alpha margins are drawn without respecting alpha
// There was a regression in DWM in Windows 7 with regard to handling WM_NCCALCSIZE to effect custom chrome.
// When windows with glass are maximized on a multi-monitor setup, the glass frame tends to turn black.
// Also, when windows are resized they tend to flicker black, sometimes staying that way until resized again.
//
// At least on RTM Win7 we can avoid the problem by making the client area not extactly match the non-client
// area, so we added the NonClientFrameEdges property.
private IntPtr _HandleNCCalcSize(WM uMsg, IntPtr wParam, IntPtr lParam, out bool handled)
{
// lParam is an [in, out] that can be either a RECT* (wParam == FALSE) or an NCCALCSIZE_PARAMS*.
// Since the first field of NCCALCSIZE_PARAMS is a RECT and is the only field we care about
// we can unconditionally treat it as a RECT.
if (_chromeInfo.NonClientFrameEdges != NonClientFrameEdges.None)
{
DpiScale dpi = _window.GetDpi();
#if RIBBON_IN_FRAMEWORK
Thickness windowResizeBorderThicknessDevice = DpiHelper.LogicalThicknessToDevice(SystemParameters.WindowResizeBorderThickness, dpi.DpiScaleX, dpi.DpiScaleY);
#else
Thickness windowResizeBorderThicknessDevice = DpiHelper.LogicalThicknessToDevice(SystemParameters2.Current.WindowResizeBorderThickness, dpi.DpiScaleX, dpi.DpiScaleY);
#endif
var rcClientArea = Marshal.PtrToStructure<RECT>(lParam);
if (Utility.IsFlagSet((int)_chromeInfo.NonClientFrameEdges, (int)NonClientFrameEdges.Top))
{
rcClientArea.Top += (int)windowResizeBorderThicknessDevice.Top;
}
if (Utility.IsFlagSet((int)_chromeInfo.NonClientFrameEdges, (int)NonClientFrameEdges.Left))
{
rcClientArea.Left += (int)windowResizeBorderThicknessDevice.Left;
}
if (Utility.IsFlagSet((int)_chromeInfo.NonClientFrameEdges, (int)NonClientFrameEdges.Bottom))
{
rcClientArea.Bottom -= (int)windowResizeBorderThicknessDevice.Bottom;
}
if (Utility.IsFlagSet((int)_chromeInfo.NonClientFrameEdges, (int)NonClientFrameEdges.Right))
{
rcClientArea.Right -= (int)windowResizeBorderThicknessDevice.Right;
}
Marshal.StructureToPtr(rcClientArea, lParam, false);
}
handled = true;
// Per MSDN for NCCALCSIZE, always return 0 when wParam == FALSE
//
// Returning 0 when wParam == TRUE is not appropriate - it will preserve
// the old client area and align it with the upper-left corner of the new
// client area. So we simply ask for a redraw (WVR_REDRAW)
IntPtr retVal = IntPtr.Zero;
if (wParam.ToInt32() != 0) // wParam == TRUE
{
retVal = new IntPtr((int) (WVR.REDRAW));
}
return retVal;
}
private HT _GetHTFromResizeGripDirection(ResizeGripDirection direction)
{
bool compliment = _window.FlowDirection == FlowDirection.RightToLeft;
switch (direction)
{
case ResizeGripDirection.Bottom:
return HT.BOTTOM;
case ResizeGripDirection.BottomLeft:
return compliment ? HT.BOTTOMRIGHT : HT.BOTTOMLEFT;
case ResizeGripDirection.BottomRight:
return compliment ? HT.BOTTOMLEFT : HT.BOTTOMRIGHT;
case ResizeGripDirection.Left:
return compliment ? HT.RIGHT : HT.LEFT;
case ResizeGripDirection.Right:
return compliment ? HT.LEFT : HT.RIGHT;
case ResizeGripDirection.Top:
return HT.TOP;
case ResizeGripDirection.TopLeft:
return compliment ? HT.TOPRIGHT : HT.TOPLEFT;
case ResizeGripDirection.TopRight:
return compliment ? HT.TOPLEFT : HT.TOPRIGHT;
default:
return HT.NOWHERE;
}
}
private IntPtr _HandleNCHitTest(WM uMsg, IntPtr wParam, IntPtr lParam, out bool handled)
{
DpiScale dpi = _window.GetDpi();
// Let the system know if we consider the mouse to be in our effective non-client area.
var mousePosScreen = new Point(Utility.GET_X_LPARAM(lParam), Utility.GET_Y_LPARAM(lParam));
Rect windowPosition = _GetWindowRect();
Point mousePosWindow = mousePosScreen;
mousePosWindow.Offset(-windowPosition.X, -windowPosition.Y);
mousePosWindow = DpiHelper.DevicePixelsToLogical(mousePosWindow, dpi.DpiScaleX, dpi.DpiScaleY);
// If the app is asking for content to be treated as client then that takes precedence over _everything_, even DWM caption buttons.
// This allows apps to set the glass frame to be non-empty, still cover it with WPF content to hide all the glass,
// yet still get DWM to draw a drop shadow.
IInputElement inputElement = _window.InputHitTest(mousePosWindow);
if (inputElement != null)
{
if (WindowChrome.GetIsHitTestVisibleInChrome(inputElement))
{
handled = true;
return new IntPtr((int)HT.CLIENT);
}
ResizeGripDirection direction = WindowChrome.GetResizeGripDirection(inputElement);
if (direction != ResizeGripDirection.None)
{
handled = true;
return new IntPtr((int)_GetHTFromResizeGripDirection(direction));
}
}
// It's not opted out, so offer up the hittest to DWM, then to our custom non-client area logic.
if (_chromeInfo.UseAeroCaptionButtons)
{
IntPtr lRet;
if (Utility.IsOSVistaOrNewer && _chromeInfo.GlassFrameThickness != default(Thickness) && _isGlassEnabled)
{
// If we're on Vista, give the DWM a chance to handle the message first.
handled = NativeMethods.DwmDefWindowProc(_hwnd, uMsg, wParam, lParam, out lRet);
if (IntPtr.Zero != lRet)
{
// If DWM claims to have handled this, then respect their call.
return lRet;
}
}
}
HT ht = _HitTestNca(
DpiHelper.DeviceRectToLogical(windowPosition, dpi.DpiScaleX, dpi.DpiScaleY),
DpiHelper.DevicePixelsToLogical(mousePosScreen, dpi.DpiScaleX, dpi.DpiScaleY));
handled = true;
return new IntPtr((int)ht);
}
private IntPtr _HandleNCRButtonUp(WM uMsg, IntPtr wParam, IntPtr lParam, out bool handled)
{
// Emulate the system behavior of clicking the right mouse button over the caption area
// to bring up the system menu.
if (HT.CAPTION == (HT)wParam.ToInt32())
{
SystemCommands.ShowSystemMenuPhysicalCoordinates(_window, new Point(Utility.GET_X_LPARAM(lParam), Utility.GET_Y_LPARAM(lParam)));
}
handled = false;
return IntPtr.Zero;
}
private IntPtr _HandleSize(WM uMsg, IntPtr wParam, IntPtr lParam, out bool handled)
{
const int SIZE_MAXIMIZED = 2;
// Force when maximized.
// We can tell what's happening right now, but the Window doesn't yet know it's
// maximized. Not forcing this update will eventually cause the
// default caption to be drawn.
WindowState? state = null;
if (wParam.ToInt32() == SIZE_MAXIMIZED)
{
state = WindowState.Maximized;
}
_UpdateSystemMenu(state);
// Still let the default WndProc handle this.
handled = false;
return IntPtr.Zero;
}
private IntPtr _HandleWindowPosChanged(WM uMsg, IntPtr wParam, IntPtr lParam, out bool handled)
{
// http://blogs.msdn.com/oldnewthing/archive/2008/01/15/7113860.aspx
// The WM_WINDOWPOSCHANGED message is sent at the end of the window
// state change process. It sort of combines the other state change
// notifications, WM_MOVE, WM_SIZE, and WM_SHOWWINDOW. But it doesn't
// suffer from the same limitations as WM_SHOWWINDOW, so you can
// reliably use it to react to the window being shown or hidden.
Assert.IsNotDefault(lParam);
var wp = Marshal.PtrToStructure<WINDOWPOS>(lParam);
// We only care to take action when the window dimensions are changing.
// Otherwise, we may get a StackOverflowException.
if (!Utility.IsFlagSet(wp.flags, (int)SWP.NOSIZE))
{
_UpdateSystemMenu(null);
if (!_isGlassEnabled)
{
_SetRoundingRegion(wp);
}
}
// Still want to pass this to DefWndProc
handled = false;
return IntPtr.Zero;
}
private IntPtr _HandleDwmCompositionChanged(WM uMsg, IntPtr wParam, IntPtr lParam, out bool handled)
{
_UpdateFrameState(false);
handled = false;
return IntPtr.Zero;
}
#endregion
/// <summary>Add and remove a native WindowStyle from the HWND.</summary>
/// <param name="removeStyle">The styles to be removed. These can be bitwise combined.</param>
/// <param name="addStyle">The styles to be added. These can be bitwise combined.</param>
/// <returns>Whether the styles of the HWND were modified as a result of this call.</returns>
private bool _ModifyStyle(WS removeStyle, WS addStyle)
{
Assert.IsNotDefault(_hwnd);
var dwStyle = (WS)NativeMethods.GetWindowLongPtr(_hwnd, GWL.STYLE).ToInt32();
var dwNewStyle = (dwStyle & ~removeStyle) | addStyle;
if (dwStyle == dwNewStyle)
{
return false;
}
NativeMethods.SetWindowLongPtr(_hwnd, GWL.STYLE, new IntPtr((int)dwNewStyle));
return true;
}
/// <summary>
/// Get the WindowState as the native HWND knows it to be. This isn't necessarily the same as what Window thinks.
/// </summary>
private WindowState _GetHwndState()
{
var wpl = NativeMethods.GetWindowPlacement(_hwnd);
switch (wpl.showCmd)
{
case SW.SHOWMINIMIZED: return WindowState.Minimized;
case SW.SHOWMAXIMIZED: return WindowState.Maximized;
}
return WindowState.Normal;
}
/// <summary>
/// Get the bounding rectangle for the window in physical coordinates.
/// </summary>
/// <returns>The bounding rectangle for the window.</returns>
private Rect _GetWindowRect()
{
// Get the window rectangle.
RECT windowPosition = NativeMethods.GetWindowRect(_hwnd);
return new Rect(windowPosition.Left, windowPosition.Top, windowPosition.Width, windowPosition.Height);
}
/// <summary>
/// Update the items in the system menu based on the current, or assumed, WindowState.
/// </summary>
/// <param name="assumeState">
/// The state to assume that the Window is in. This can be null to query the Window's state.
/// </param>
/// <remarks>
/// We want to update the menu while we have some control over whether the caption will be repainted.
/// </remarks>
private void _UpdateSystemMenu(WindowState? assumeState)
{
const MF mfEnabled = MF.ENABLED | MF.BYCOMMAND;
const MF mfDisabled = MF.GRAYED | MF.DISABLED | MF.BYCOMMAND;
WindowState state = assumeState ?? _GetHwndState();
if (null != assumeState || _lastMenuState != state)
{
_lastMenuState = state;
bool modified = _ModifyStyle(WS.VISIBLE, 0);
IntPtr hmenu = NativeMethods.GetSystemMenu(_hwnd, false);
if (IntPtr.Zero != hmenu)
{
var dwStyle = (WS)NativeMethods.GetWindowLongPtr(_hwnd, GWL.STYLE).ToInt32();
bool canMinimize = Utility.IsFlagSet((int)dwStyle, (int)WS.MINIMIZEBOX);
bool canMaximize = Utility.IsFlagSet((int)dwStyle, (int)WS.MAXIMIZEBOX);
bool canSize = Utility.IsFlagSet((int)dwStyle, (int)WS.THICKFRAME);
switch (state)
{
case WindowState.Maximized:
NativeMethods.EnableMenuItem(hmenu, SC.RESTORE, mfEnabled);
NativeMethods.EnableMenuItem(hmenu, SC.MOVE, mfDisabled);
NativeMethods.EnableMenuItem(hmenu, SC.SIZE, mfDisabled);
NativeMethods.EnableMenuItem(hmenu, SC.MINIMIZE, canMinimize ? mfEnabled : mfDisabled);
NativeMethods.EnableMenuItem(hmenu, SC.MAXIMIZE, mfDisabled);
break;
case WindowState.Minimized:
NativeMethods.EnableMenuItem(hmenu, SC.RESTORE, mfEnabled);
NativeMethods.EnableMenuItem(hmenu, SC.MOVE, mfDisabled);
NativeMethods.EnableMenuItem(hmenu, SC.SIZE, mfDisabled);
NativeMethods.EnableMenuItem(hmenu, SC.MINIMIZE, mfDisabled);
NativeMethods.EnableMenuItem(hmenu, SC.MAXIMIZE, canMaximize ? mfEnabled : mfDisabled);
break;
default:
NativeMethods.EnableMenuItem(hmenu, SC.RESTORE, mfDisabled);
NativeMethods.EnableMenuItem(hmenu, SC.MOVE, mfEnabled);
NativeMethods.EnableMenuItem(hmenu, SC.SIZE, canSize ? mfEnabled : mfDisabled);
NativeMethods.EnableMenuItem(hmenu, SC.MINIMIZE, canMinimize ? mfEnabled : mfDisabled);
NativeMethods.EnableMenuItem(hmenu, SC.MAXIMIZE, canMaximize ? mfEnabled : mfDisabled);
break;
}
}
if (modified)
{
_ModifyStyle(0, WS.VISIBLE);
}
}
}
private void _UpdateFrameState(bool force)
{
if (IntPtr.Zero == _hwnd || _hwndSource.IsDisposed)
{
return;
}
// Don't rely on SystemParameters for this, just make the check ourselves.
bool frameState = NativeMethods.DwmIsCompositionEnabled();
if (force || frameState != _isGlassEnabled)
{
_isGlassEnabled = frameState && _chromeInfo.GlassFrameThickness != default(Thickness);
if (!_isGlassEnabled)
{
_SetRoundingRegion(null);
}
else
{
_ClearRoundingRegion();
_ExtendGlassFrame();
}
NativeMethods.SetWindowPos(_hwnd, IntPtr.Zero, 0, 0, 0, 0, _SwpFlags);
}
}
private void _ClearRoundingRegion()
{
NativeMethods.SetWindowRgn(_hwnd, IntPtr.Zero, NativeMethods.IsWindowVisible(_hwnd));
}
private void _SetRoundingRegion(WINDOWPOS? wp)
{
const int MONITOR_DEFAULTTONEAREST = 0x00000002;
// We're early - WPF hasn't necessarily updated the state of the window.
// Need to query it ourselves.
WINDOWPLACEMENT wpl = NativeMethods.GetWindowPlacement(_hwnd);
if (wpl.showCmd == SW.SHOWMAXIMIZED)
{
int left;
int top;
if (wp.HasValue)
{
left = wp.Value.x;
top = wp.Value.y;
}
else
{
Rect r = _GetWindowRect();
left = (int)r.Left;
top = (int)r.Top;
}
IntPtr hMon = NativeMethods.MonitorFromWindow(_hwnd, MONITOR_DEFAULTTONEAREST);
MONITORINFO mi = NativeMethods.GetMonitorInfo(hMon);
RECT rcMax = mi.rcWork;
// The location of maximized window takes into account the border that Windows was
// going to remove, so we also need to consider it.
rcMax.Offset(-left, -top);
IntPtr hrgn = IntPtr.Zero;
try
{
hrgn = NativeMethods.CreateRectRgnIndirect(rcMax);
NativeMethods.SetWindowRgn(_hwnd, hrgn, NativeMethods.IsWindowVisible(_hwnd));
hrgn = IntPtr.Zero;
}
finally
{
Utility.SafeDeleteObject(ref hrgn);
}
}
else
{
Size windowSize;
// Use the size if it's specified.
if (null != wp && !Utility.IsFlagSet(wp.Value.flags, (int)SWP.NOSIZE))
{
windowSize = new Size((double)wp.Value.cx, (double)wp.Value.cy);
}
else if (null != wp && (_lastRoundingState == _window.WindowState))
{
return;
}
else
{
windowSize = _GetWindowRect().Size;
}
_lastRoundingState = _window.WindowState;
IntPtr hrgn = IntPtr.Zero;
try
{
DpiScale dpi = _window.GetDpi();
double shortestDimension = Math.Min(windowSize.Width, windowSize.Height);
double topLeftRadius = DpiHelper.LogicalPixelsToDevice(new Point(_chromeInfo.CornerRadius.TopLeft, 0), dpi.DpiScaleX, dpi.DpiScaleY).X;
topLeftRadius = Math.Min(topLeftRadius, shortestDimension / 2);
if (_IsUniform(_chromeInfo.CornerRadius))
{
// RoundedRect HRGNs require an additional pixel of padding.
hrgn = _CreateRoundRectRgn(new Rect(windowSize), topLeftRadius);
}
else
{
// We need to combine HRGNs for each of the corners.
// Create one for each quadrant, but let it overlap into the two adjacent ones
// by the radius amount to ensure that there aren't corners etched into the middle
// of the window.
hrgn = _CreateRoundRectRgn(new Rect(0, 0, windowSize.Width / 2 + topLeftRadius, windowSize.Height / 2 + topLeftRadius), topLeftRadius);
double topRightRadius = DpiHelper.LogicalPixelsToDevice(new Point(_chromeInfo.CornerRadius.TopRight, 0), dpi.DpiScaleX, dpi.DpiScaleY).X;
topRightRadius = Math.Min(topRightRadius, shortestDimension / 2);
Rect topRightRegionRect = new Rect(0, 0, windowSize.Width / 2 + topRightRadius, windowSize.Height / 2 + topRightRadius);
topRightRegionRect.Offset(windowSize.Width / 2 - topRightRadius, 0);
Assert.AreEqual(topRightRegionRect.Right, windowSize.Width);
_CreateAndCombineRoundRectRgn(hrgn, topRightRegionRect, topRightRadius);
double bottomLeftRadius = DpiHelper.LogicalPixelsToDevice(new Point(_chromeInfo.CornerRadius.BottomLeft, 0), dpi.DpiScaleX, dpi.DpiScaleY).X;
bottomLeftRadius = Math.Min(bottomLeftRadius, shortestDimension / 2);
Rect bottomLeftRegionRect = new Rect(0, 0, windowSize.Width / 2 + bottomLeftRadius, windowSize.Height / 2 + bottomLeftRadius);
bottomLeftRegionRect.Offset(0, windowSize.Height / 2 - bottomLeftRadius);
Assert.AreEqual(bottomLeftRegionRect.Bottom, windowSize.Height);
_CreateAndCombineRoundRectRgn(hrgn, bottomLeftRegionRect, bottomLeftRadius);
double bottomRightRadius = DpiHelper.LogicalPixelsToDevice(new Point(_chromeInfo.CornerRadius.BottomRight, 0), dpi.DpiScaleX, dpi.DpiScaleY).X;
bottomRightRadius = Math.Min(bottomRightRadius, shortestDimension / 2);
Rect bottomRightRegionRect = new Rect(0, 0, windowSize.Width / 2 + bottomRightRadius, windowSize.Height / 2 + bottomRightRadius);
bottomRightRegionRect.Offset(windowSize.Width / 2 - bottomRightRadius, windowSize.Height / 2 - bottomRightRadius);
Assert.AreEqual(bottomRightRegionRect.Right, windowSize.Width);
Assert.AreEqual(bottomRightRegionRect.Bottom, windowSize.Height);
_CreateAndCombineRoundRectRgn(hrgn, bottomRightRegionRect, bottomRightRadius);
}
NativeMethods.SetWindowRgn(_hwnd, hrgn, NativeMethods.IsWindowVisible(_hwnd));
hrgn = IntPtr.Zero;
}
finally
{
// Free the memory associated with the HRGN if it wasn't assigned to the HWND.
Utility.SafeDeleteObject(ref hrgn);
}
}
}
private static IntPtr _CreateRoundRectRgn(Rect region, double radius)
{
// Round outwards.
if (DoubleUtilities.AreClose(0, radius))
{
return NativeMethods.CreateRectRgn(
(int)Math.Floor(region.Left),
(int)Math.Floor(region.Top),
(int)Math.Ceiling(region.Right),
(int)Math.Ceiling(region.Bottom));
}
// RoundedRect HRGNs require an additional pixel of padding on the bottom right to look correct.
return NativeMethods.CreateRoundRectRgn(
(int)Math.Floor(region.Left),
(int)Math.Floor(region.Top),
(int)Math.Ceiling(region.Right) + 1,
(int)Math.Ceiling(region.Bottom) + 1,
(int)Math.Ceiling(radius),
(int)Math.Ceiling(radius));
}
[SuppressMessage("Microsoft.Naming", "CA2204:Literals should be spelled correctly", MessageId = "HRGNs")]
private static void _CreateAndCombineRoundRectRgn(IntPtr hrgnSource, Rect region, double radius)
{
IntPtr hrgn = IntPtr.Zero;
try
{
hrgn = _CreateRoundRectRgn(region, radius);
CombineRgnResult result = NativeMethods.CombineRgn(hrgnSource, hrgnSource, hrgn, RGN.OR);
if (result == CombineRgnResult.ERROR)
{
throw new InvalidOperationException("Unable to combine two HRGNs.");
}
}
catch
{
Utility.SafeDeleteObject(ref hrgn);
throw;
}
}
private static bool _IsUniform(CornerRadius cornerRadius)
{
if (!DoubleUtilities.AreClose(cornerRadius.BottomLeft, cornerRadius.BottomRight))
{
return false;
}
if (!DoubleUtilities.AreClose(cornerRadius.TopLeft, cornerRadius.TopRight))
{
return false;
}
if (!DoubleUtilities.AreClose(cornerRadius.BottomLeft, cornerRadius.TopRight))
{
return false;
}
return true;
}
private void _ExtendGlassFrame()
{
Assert.IsNotNull(_window);
// Expect that this might be called on OSes other than Vista.
if (!Utility.IsOSVistaOrNewer)
{
// Not an error. Just not on Vista so we're not going to get glass.
return;
}
if (IntPtr.Zero == _hwnd)
{
// Can't do anything with this call until the Window has been shown.
return;
}
// Ensure standard HWND background painting when DWM isn't enabled.
if (!NativeMethods.DwmIsCompositionEnabled())
{
_hwndSource.CompositionTarget.BackgroundColor = SystemColors.WindowColor;
}
else
{
DpiScale dpi = _window.GetDpi();
// This makes the glass visible at a Win32 level so long as nothing else is covering it.
// The Window's Background needs to be changed independent of this.
// Apply the transparent background to the HWND
_hwndSource.CompositionTarget.BackgroundColor = Colors.Transparent;
// Thickness is going to be DIPs, need to convert to system coordinates.
Thickness deviceGlassThickness = DpiHelper.LogicalThicknessToDevice(_chromeInfo.GlassFrameThickness, dpi.DpiScaleX, dpi.DpiScaleY);
if (_chromeInfo.NonClientFrameEdges != NonClientFrameEdges.None)
{
#if RIBBON_IN_FRAMEWORK
Thickness windowResizeBorderThicknessDevice = DpiHelper.LogicalThicknessToDevice(SystemParameters.WindowResizeBorderThickness, dpi.DpiScaleX, dpi.DpiScaleY);
#else
Thickness windowResizeBorderThicknessDevice = DpiHelper.LogicalThicknessToDevice(SystemParameters2.Current.WindowResizeBorderThickness, dpi.DpiScaleX, dpi.DpiScaleY);
#endif
if (Utility.IsFlagSet((int)_chromeInfo.NonClientFrameEdges, (int)NonClientFrameEdges.Top))
{
deviceGlassThickness.Top -= windowResizeBorderThicknessDevice.Top;
deviceGlassThickness.Top = Math.Max(0, deviceGlassThickness.Top);
}
if (Utility.IsFlagSet((int)_chromeInfo.NonClientFrameEdges, (int)NonClientFrameEdges.Left))
{
deviceGlassThickness.Left -= windowResizeBorderThicknessDevice.Left;
deviceGlassThickness.Left = Math.Max(0, deviceGlassThickness.Left);
}
if (Utility.IsFlagSet((int)_chromeInfo.NonClientFrameEdges, (int)NonClientFrameEdges.Bottom))
{
deviceGlassThickness.Bottom -= windowResizeBorderThicknessDevice.Bottom;
deviceGlassThickness.Bottom = Math.Max(0, deviceGlassThickness.Bottom);
}
if (Utility.IsFlagSet((int)_chromeInfo.NonClientFrameEdges, (int)NonClientFrameEdges.Right))
{
deviceGlassThickness.Right -= windowResizeBorderThicknessDevice.Right;
deviceGlassThickness.Right = Math.Max(0, deviceGlassThickness.Right);
}
}
var dwmMargin = new MARGINS
{
// err on the side of pushing in glass an extra pixel.
cxLeftWidth = (int)Math.Ceiling(deviceGlassThickness.Left),
cxRightWidth = (int)Math.Ceiling(deviceGlassThickness.Right),
cyTopHeight = (int)Math.Ceiling(deviceGlassThickness.Top),
cyBottomHeight = (int)Math.Ceiling(deviceGlassThickness.Bottom),
};
NativeMethods.DwmExtendFrameIntoClientArea(_hwnd, ref dwmMargin);
}
}
/// <summary>
/// Matrix of the HT values to return when responding to NC window messages.
/// </summary>
[SuppressMessage("Microsoft.Performance", "CA1814:PreferJaggedArraysOverMultidimensional", MessageId = "Member")]
private static readonly HT[,] _HitTestBorders = new[,]
{
{ HT.TOPLEFT, HT.TOP, HT.TOPRIGHT },
{ HT.LEFT, HT.CLIENT, HT.RIGHT },
{ HT.BOTTOMLEFT, HT.BOTTOM, HT.BOTTOMRIGHT },
};
private HT _HitTestNca(Rect windowPosition, Point mousePosition)
{
// Determine if hit test is for resizing, default middle (1,1).
int uRow = 1;
int uCol = 1;
bool onResizeBorder = false;
// Determine if the point is at the top or bottom of the window.
if (mousePosition.Y >= windowPosition.Top && mousePosition.Y < windowPosition.Top + _chromeInfo.ResizeBorderThickness.Top + _chromeInfo.CaptionHeight)
{
onResizeBorder = (mousePosition.Y < (windowPosition.Top + _chromeInfo.ResizeBorderThickness.Top));
uRow = 0; // top (caption or resize border)
}
else if (mousePosition.Y < windowPosition.Bottom && mousePosition.Y >= windowPosition.Bottom - (int)_chromeInfo.ResizeBorderThickness.Bottom)
{
uRow = 2; // bottom
}
// Determine if the point is at the left or right of the window.
if (mousePosition.X >= windowPosition.Left && mousePosition.X < windowPosition.Left + (int)_chromeInfo.ResizeBorderThickness.Left)
{
uCol = 0; // left side
}
else if (mousePosition.X < windowPosition.Right && mousePosition.X >= windowPosition.Right - _chromeInfo.ResizeBorderThickness.Right)
{
uCol = 2; // right side
}
// If the cursor is in one of the top edges by the caption bar, but below the top resize border,
// then resize left-right rather than diagonally.
if (uRow == 0 && uCol != 1 && !onResizeBorder)
{
uRow = 1;
}
HT ht = _HitTestBorders[uRow, uCol];
if (ht == HT.TOP && !onResizeBorder)
{
ht = HT.CAPTION;
}
return ht;
}
// Return the effective client area, excluding the invisible caption
// and resize-border areas.
// This method is called via private reflection from PresentationCore,
// method HwndMouseInputProvider.HasCustomChrome. Both places have to
// agree on the signature.
private bool GetEffectiveClientArea(ref MS.Win32.NativeMethods.RECT rcClient)
{
if (_window == null || _chromeInfo == null)
return false;
DpiScale dpi = _window.GetDpi();
double captionHeight = _chromeInfo.CaptionHeight;
Thickness resizeBorderThickness = _chromeInfo.ResizeBorderThickness;
RECT rcWindow = NativeMethods.GetWindowRect(_hwnd);
Size logicalSize = DpiHelper.DeviceSizeToLogical(new Size(rcWindow.Width, rcWindow.Height), dpi.DpiScaleX, dpi.DpiScaleY);
Point logicalTopLeft = new Point(resizeBorderThickness.Left,
resizeBorderThickness.Top + captionHeight);
Point logicalBottomRight = new Point(logicalSize.Width - resizeBorderThickness.Right,
logicalSize.Height - resizeBorderThickness.Bottom);
Point deviceTopLeft = DpiHelper.LogicalPixelsToDevice(logicalTopLeft, dpi.DpiScaleX, dpi.DpiScaleY);
Point deviceBottomRight = DpiHelper.LogicalPixelsToDevice(logicalBottomRight, dpi.DpiScaleX, dpi.DpiScaleY);
rcClient.left = (int)deviceTopLeft.X;
rcClient.top = (int)deviceTopLeft.Y;
rcClient.right = (int)deviceBottomRight.X;
rcClient.bottom = (int)deviceBottomRight.Y;
return true;
}
#region Remove Custom Chrome Methods
private void _RestoreStandardChromeState(bool isClosing)
{
VerifyAccess();
_UnhookCustomChrome();
if (!isClosing && !_hwndSource.IsDisposed)
{
_RestoreFrameworkIssueFixups();
_RestoreGlassFrame();
_RestoreHrgn();
_window.InvalidateMeasure();
}
}
private void _UnhookCustomChrome()
{
Assert.IsNotDefault(_hwnd);
Assert.IsNotNull(_window);
if (_isHooked)
{
_hwndSource.RemoveHook(_WndProc);
_isHooked = false;
}
}
private void _RestoreFrameworkIssueFixups()
{
FrameworkElement rootElement = (FrameworkElement)VisualTreeHelper.GetChild(_window, 0);
// Undo anything that was done before.
rootElement.Margin = new Thickness();
}
private void _RestoreGlassFrame()
{
Assert.IsNull(_chromeInfo);
Assert.IsNotNull(_window);
// Expect that this might be called on OSes other than Vista
// and if the window hasn't yet been shown, then we don't need to undo anything.
if (!Utility.IsOSVistaOrNewer || _hwnd == IntPtr.Zero)
{
return;
}
_hwndSource.CompositionTarget.BackgroundColor = SystemColors.WindowColor;
if (NativeMethods.DwmIsCompositionEnabled())
{
// If glass is enabled, push it back to the normal bounds.
var dwmMargin = new MARGINS();
NativeMethods.DwmExtendFrameIntoClientArea(_hwnd, ref dwmMargin);
}
}
private void _RestoreHrgn()
{
_ClearRoundingRegion();
NativeMethods.SetWindowPos(_hwnd, IntPtr.Zero, 0, 0, 0, 0, _SwpFlags);
}
#endregion
}
}
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