public bool DetachHwndTarget(HwndTarget hwndTarget)
{
Debug.Assert(hwndTarget != null);
MonitorPowerEvent -= hwndTarget.OnMonitorPowerEvent;
_hwndTargetCount--;
Debug.Assert(_hwndTargetCount >= 0);
return (_hwndTargetCount == 0);
}
private void Initialize(HwndSourceParameters parameters)
{
_mouse = new SecurityCriticalDataClass<HwndMouseInputProvider>(new HwndMouseInputProvider(this));
_keyboard = new SecurityCriticalDataClass<HwndKeyboardInputProvider>(new HwndKeyboardInputProvider(this));
_layoutHook = new HwndWrapperHook(LayoutFilterMessage);
_inputHook = new HwndWrapperHook(InputFilterMessage);
_hwndTargetHook = new HwndWrapperHook(HwndTargetFilterMessage);
_publicHook = new HwndWrapperHook(PublicHooksFilterMessage);
// When processing WM_SIZE, LayoutFilterMessage must be invoked before
// HwndTargetFilterMessage. This way layout will be updated before resizing
// HwndTarget, resulting in single render per resize. This means that
// layout hook should appear before HwndTarget hook in the wrapper hooks
// list. If this is done the other way around, first HwndTarget resize will
// force re-render, then layout will be updated according to the new size,
// scheduling another render.
HwndWrapperHook[] wrapperHooks = { _hwndTargetHook, _layoutHook, _inputHook, null };
if (null != parameters.HwndSourceHook)
{
// In case there's more than one delegate, add these to the event storage backwards
// so they'll get invoked in the expected order.
Delegate[] handlers = parameters.HwndSourceHook.GetInvocationList();
for (int i = handlers.Length -1; i >= 0; --i)
{
_hooks += (HwndSourceHook)handlers[i];
}
wrapperHooks[3] = _publicHook;
}
_restoreFocusMode = parameters.RestoreFocusMode;
_acquireHwndFocusInMenuMode = parameters.AcquireHwndFocusInMenuMode;
// A window must be marked WS_EX_LAYERED if (and only if):
// 1) it is not a child window
// -- AND --
// 2) a color-key is specified
// 3) or an opacity other than 1.0 is specified
// 4) or per-pixel alpha is requested.
if((parameters.WindowStyle & NativeMethods.WS_CHILD) == 0 &&
( //parameters.ColorKey != null ||
//!MS.Internal.DoubleUtil.AreClose(parameters.Opacity, 1.0) ||
parameters.UsesPerPixelOpacity))
{
parameters.ExtendedWindowStyle |= NativeMethods.WS_EX_LAYERED;
}
else
{
parameters.ExtendedWindowStyle &= (~NativeMethods.WS_EX_LAYERED);
}
_constructionParameters = parameters;
_hwndWrapper = new HwndWrapper(parameters.WindowClassStyle,
parameters.WindowStyle,
parameters.ExtendedWindowStyle,
parameters.PositionX,
parameters.PositionY,
parameters.Width,
parameters.Height,
parameters.WindowName,
parameters.ParentWindow,
wrapperHooks);
_hwndTarget = new HwndTarget(_hwndWrapper.Handle);
//_hwndTarget.ColorKey = parameters.ColorKey;
//_hwndTarget.Opacity = parameters.Opacity;
_hwndTarget.UsesPerPixelOpacity = parameters.UsesPerPixelOpacity;
if(_hwndTarget.UsesPerPixelOpacity)
{
_hwndTarget.BackgroundColor = Colors.Transparent;
// Prevent this window from being themed.
UnsafeNativeMethods.CriticalSetWindowTheme(new HandleRef(this, _hwndWrapper.Handle), "", "");
}
_constructionParameters = null;
if (!parameters.HasAssignedSize)
_sizeToContent = SizeToContent.WidthAndHeight;
_adjustSizingForNonClientArea = parameters.AdjustSizingForNonClientArea;
_treatAncestorsAsNonClientArea = parameters.TreatAncestorsAsNonClientArea;
// Listen to the UIContext.Disposed event so we can clean up.
// The HwndTarget cannot work without a MediaContext which
// is disposed when the UIContext is disposed. So we need to
// dispose the HwndTarget and also never use it again (to
// paint or process input). The easiest way to do this is to just
// dispose the HwndSource at the same time.
_weakShutdownHandler = new WeakEventDispatcherShutdown(this, this.Dispatcher);
// Listen to the HwndWrapper.Disposed event so we can clean up.
// The HwndTarget cannot work without a live HWND, and since
// the HwndSource represents an HWND, we make sure we dispose
// ourselves if the HWND is destroyed out from underneath us.
_hwndWrapper.Disposed += new EventHandler(OnHwndDisposed);
_stylus = new SecurityCriticalDataClass<HwndStylusInputProvider>(new HwndStylusInputProvider(this));
// WM_APPCOMMAND events are handled thru this.
_appCommand = new SecurityCriticalDataClass<HwndAppCommandInputProvider>(new HwndAppCommandInputProvider(this));
// Register the top level source with the ComponentDispatcher.
if (parameters.TreatAsInputRoot)
{
_weakPreprocessMessageHandler = new WeakEventPreprocessMessage(this, false);
}
AddSource();
// Register dropable window.
// The checking CallerHasPermissionWithAppDomainOptimization will call RegisterDropTarget
// safely without the security exception in case of no unmanaged code permission.
// So RegisterDropTarget will be called safely in case of having the unmanged code permission.
// Otherwise, the security exception cause System.Printing to be instatiated which will
// load system.drawing module.
if (_hwndWrapper.Handle != IntPtr.Zero &&
SecurityHelper.CallerHasPermissionWithAppDomainOptimization(new SecurityPermission(SecurityPermissionFlag.UnmanagedCode)))
{
// This call is safe since DragDrop.RegisterDropTarget is checking the unmanged
// code permission.
DragDrop.RegisterDropTarget(_hwndWrapper.Handle);
_registeredDropTargetCount++;
}
}
public void AttachHwndTarget(HwndTarget hwndTarget)
{
Debug.Assert(hwndTarget != null);
MonitorPowerEvent += hwndTarget.OnMonitorPowerEvent;
if (_hwndTargetCount > 0)
{
// Every hwnd which registers to listen PBT_POWERSETTINGCHANGE
// gets the message atleast once so as to set the appropriate
// state. This call to the event handler simulates similar
// behavior. It is too early for the hwnd to paint, hence
// pass paintOnWake=false assuming that it will soon get
// a WM_PAINT message.
hwndTarget.OnMonitorPowerEvent(null, _monitorOn, /*paintOnWake*/ false);
}
_hwndTargetCount++;
}