private static void RaiseVisualTreeChangedEvent(
EventHandler <VisualTreeChangeEventArgs> visualTreeChanged,
VisualTreeChangeEventArgs args,
bool isPotentialOuterChange)
{
bool savedIsVisualTreeChangedInProgress = s_IsVisualTreeChangedInProgress;
HwndSource savedActiveHwndSource = s_ActiveHwndSource;
try
{
s_IsVisualTreeChangedInProgress = true;
if (isPotentialOuterChange)
{
s_ActiveHwndSource = PresentationSource.FromDependencyObject(args.Parent) as System.Windows.Interop.HwndSource;
}
visualTreeChanged(null, args);
}
finally
{
s_IsVisualTreeChangedInProgress = savedIsVisualTreeChangedInProgress;
s_ActiveHwndSource = savedActiveHwndSource;
}
}
public static Form FindForm(this DependencyObject element)
{
if (element == null)
{
return(null);
}
var source = PresentationSource.FromDependencyObject(element) as HwndSource;
if (source == null)
{
return(null);
}
var host = Control.FromChildHandle(source.Handle) as ElementHost;
if (host == null)
{
return(null);
}
var form = host.TopLevelControl as Form;
return(form);
}
void ICefWebBrowserInternal.OnPreviewKeyEvent(CefKeyEvent keyEvent)
{
this.DispatchIfRequired(() =>
{
if (keyEvent.EventType == CefKeyEventType.RawKeyDown)
{
var keys = (Keys)keyEvent.WindowsKeyCode;
if ((keyEvent.Modifiers & CefEventFlags.ControlDown) == CefEventFlags.ControlDown)
{
keys |= Keys.Control;
}
if ((keyEvent.Modifiers & CefEventFlags.ShiftDown) == CefEventFlags.ShiftDown)
{
keys |= Keys.Shift;
}
if ((keyEvent.Modifiers & CefEventFlags.AltDown) == CefEventFlags.AltDown)
{
keys |= Keys.Alt;
}
var source = PresentationSource.FromDependencyObject(this);
var key = KeyInterop.KeyFromVirtualKey((int)keys);
var args = new System.Windows.Input.KeyEventArgs(Keyboard.PrimaryDevice, source, 0, key)
{
RoutedEvent = PreviewKeyDownEvent
};
RaiseEvent(args);
}
}, true);
}
private static void OnPreviewGotKeyboardFocus(object sender, KeyboardFocusChangedEventArgs args)
{
if (!IsCurrentThreadMainUiThread())
{
return;
}
if (!(sender is DependencyObject dependencyObject) || !IsRegisteredCommandFocusElement(dependencyObject))
{
return;
}
if (_restoreFocusScope == null && IsCommandContainerGainingFocus(args.OldFocus, args.NewFocus))
{
if (!IsAttachedCommandFocusElement(dependencyObject))
{
CurrentMenuModeSource = PresentationSource.FromDependencyObject(dependencyObject);
}
_restoreFocusScope = new CommandRestoreFocusScope(args.OldFocus);
}
if (PresentationSource.FromDependencyObject(dependencyObject) != null)
{
return;
}
args.Handled = true;
}
private static void OnKeyboardInputProviderAcquireFocus(object sender,
KeyboardInputProviderAcquireFocusEventArgs e)
{
if (!IsCurrentThreadMainUiThread())
{
return;
}
if (!(sender is DependencyObject dependencyObject) || !IsRegisteredCommandFocusElement(dependencyObject))
{
return;
}
if (dependencyObject is IInputElement inputElement && !inputElement.IsKeyboardFocusWithin)
{
if (e.RoutedEvent == Keyboard.PreviewKeyboardInputProviderAcquireFocusEvent)
{
if (!IsAttachedCommandFocusElement(dependencyObject))
{
CurrentMenuModeSource = PresentationSource.FromDependencyObject(dependencyObject);
}
}
else if (!e.FocusAcquired)
{
CurrentMenuModeSource = null;
}
}
if (PresentationSource.FromDependencyObject(dependencyObject) != null)
{
return;
}
e.Handled = true;
}
public void UpdateDisplayInfo(DependencyObject @object)
{
var source = PresentationSource.FromDependencyObject(@object).CompositionTarget.TransformToDevice;
DPIX = source.M11;
DPIY = source.M22;
}
public static void CreateNativeWindow(this Control owner, Action <HwndSource> showNativeDialog, Point location)
{
var screenLoc = owner.PointToScreen(location);
var wnd = new Window()
{
WindowStyle = WindowStyle.None,
ShowInTaskbar = false,
ResizeMode = ResizeMode.NoResize,
Left = screenLoc.X,
Top = screenLoc.Y,
Width = 0,
Height = 0,
Owner = Window.GetWindow(owner),
};
wnd.SourceInitialized += (s, e) =>
{
showNativeDialog((HwndSource)PresentationSource.FromDependencyObject(wnd));
wnd.Close();
};
wnd.ShowDialog();
wnd.Close();
}
public ClipboardExtensions(object owner)
{
_host = WpfHost.Current;
// This class may be accessed before the Window is loaded
// if the Clipboard is somehow accessed really early.
if (_host.IsLoaded)
{
HostLoaded(null, null);
}
else
{
// Hook for native events
_host.Loaded += HostLoaded;
}
void HostLoaded(object sender, RoutedEventArgs e)
{
_host.Loaded -= HostLoaded;
var win = Window.GetWindow(_host);
var fromDependencyObject = PresentationSource.FromDependencyObject(win);
_hwndSource = fromDependencyObject as HwndSource;
if (_pendingStartContentChanged)
{
StartContentChanged();
}
}
}
// For compat, allow nested changes when:
// a. The outer change added a child to an element that is a visual
// root of a window. (More precisely - the element has no parent,
// but does have an HwndSource.)
// b. The inner change affects an element belonging to a different
// PresentationSource.
//
// Handlers for VisualTreeChanged should not cause side-effects - that
// creates a situation where the app can behave differently during
// diagnosis than it does in production. But some already-shipped
// diagnostic assistants cause side-effects in the situation above.
// [VS 2015 and 2017 create a new window to hold the "little box"
// containing the diagnostic icons/buttons. They should have done this
// asynchronously, outside the scope of VisualTreeChanged, but they
// already shipped with this flaw.]
//
private static bool IsChangePermitted(DependencyObject d)
{
// if the outer change was type (a), OnVisualChildChanged saved
// the presentation source in s_ActiveHwndSource
return((s_ActiveHwndSource != null) && (d != null) &&
(s_ActiveHwndSource != PresentationSource.FromDependencyObject(d)));
}
/// <summary>Initializes the specified root.</summary>
/// <param name="root">The root.</param>
public void Initialize(DependencyObject root)
{
if (root is FrameworkElement frameworkElement)
{
frameworkElement.DataContextChanged += this.OnFrameworkElementDataContextChanged;
frameworkElement.Unloaded += this.OnFrameworkElementUnloaded;
}
#if WPF
if (root is FrameworkContentElement frameworkContentElement)
{
frameworkContentElement.DataContextChanged += this.OnFrameworkElementDataContextChanged;
frameworkContentElement.Unloaded += this.OnFrameworkElementUnloaded;
}
#endif
if (root.Dispatcher != null)
{
root.Dispatcher.ShutdownFinished += this.OnDispatcherShutdownFinished;
}
if (PresentationSource.FromDependencyObject(root) is HwndSource hwndSource)
{
hwndSource.Disposed += this.OnHwndSourceDisposed;
}
}
public WpfUIElementPointersSupport(object owner)
{
_ownerEvents = (ICoreWindowEvents)owner;
_host = WpfHost.Current;
_host.MouseEnter += HostOnMouseEnter;
_host.MouseLeave += HostOnMouseLeave;
_host.MouseMove += HostOnMouseMove;
_host.MouseDown += HostOnMouseDown;
_host.MouseUp += HostOnMouseUp;
// Hook for native events
_host.Loaded += HookNative;
void HookNative(object sender, RoutedEventArgs e)
{
_host.Loaded -= HookNative;
var win = Window.GetWindow(_host);
var fromDependencyObject = PresentationSource.FromDependencyObject(win);
_hwndSource = fromDependencyObject as HwndSource;
_hwndSource?.AddHook(OnWmMessage);
}
}
public static void RegisterCallback(Window window, Action <string> callback)
{
IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wparam, IntPtr lparam, ref bool handled)
{
if (msg == WM_COPYDATA)
{
var data = Marshal.PtrToStructure <CopyData>(lparam);
if (data.dwData == (IntPtr)MessageId)
{
var value = Marshal.PtrToStringUni(data.lpData);
callback(value);
handled = true;
}
}
return(IntPtr.Zero);
}
var source = (HwndSource)PresentationSource.FromDependencyObject(window);
if (source is null)
{
window.SourceInitialized += delegate { RegisterCallback(window, callback); };
return;
}
source.AddHook(WndProc);
}
private void RemoveCloseReasonHook()
{
if (PresentationSource.FromDependencyObject(this) is HwndSource source)
{
source.RemoveHook(WindowProc);
}
}
private void TreeViewItem_RequestBringIntoView(object sender, RequestBringIntoViewEventArgs e)
{
var treeViewItem = (TreeViewItem)sender;
var treeView = (TreeView)typeof(TreeViewItem).GetProperty("ParentTreeView", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(treeViewItem);
if (PresentationSource.FromDependencyObject(treeViewItem) == null)
{
// the item might have disconnected by the time we run this
return;
}
Point topLeftInTreeViewCoordinates = treeViewItem.TransformToAncestor(treeView).Transform(new Point(0, 0));
var treeViewItemTop = topLeftInTreeViewCoordinates.Y;
if (treeViewItemTop < 0 ||
treeViewItemTop + treeViewItem.ActualHeight > scrollViewer.ViewportHeight ||
treeViewItem.ActualHeight > scrollViewer.ViewportHeight)
{
// if the item is not visible or too "tall", don't do anything; let them scroll it into view
return;
}
// if the item is already fully within the viewport vertically, disallow horizontal scrolling
e.Handled = true;
}
/// <summary>
/// Enter Full Screen Mode
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void MenuButton_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
if (!maximized)
{
fullScreenWindow = new Window();
this.Content = new TextBlock {
Text = "Control Content Maximized"
};
fullScreenWindow.Title = "Virtual Earth";
fullScreenWindow.Loaded += delegate
{
HwndSource source = (HwndSource)PresentationSource.FromDependencyObject(fullScreenWindow);
source.AddHook(WindowProc);
};
fullScreenWindow.Content = mainGrid;
fullScreenWindow.WindowStyle = WindowStyle.None;
fullScreenWindow.WindowStartupLocation = WindowStartupLocation.CenterScreen;
fullScreenWindow.WindowState = WindowState.Maximized;
fullScreenWindow.Closing += new System.ComponentModel.CancelEventHandler(w_Closing);
maximized = true;
fullScreenWindow.Show();
}
else
{
fullScreenWindow.Content = null;
fullScreenWindow.Close();
this.Content = mainGrid;
maximized = false;
}
}
public static FrameworkElement GetRootVisual([NotNull] this DependencyObject item)
{
Contract.Requires(item != null);
Contract.Ensures(Contract.Result <FrameworkElement>() != null);
var hwndSource = (HwndSource)PresentationSource.FromDependencyObject(item);
if (hwndSource == null)
{
throw new ArgumentException(@"Item not part of a valid visual tree.", nameof(item));
}
var compositionTarget = hwndSource.CompositionTarget;
if (compositionTarget == null)
{
throw new ArgumentException(@"Item not part of a valid visual tree.", nameof(item));
}
var rootVisual = (FrameworkElement)compositionTarget.RootVisual;
if (rootVisual == null)
{
throw new ArgumentException(@"Item not part of a valid visual tree.", nameof(item));
}
return(rootVisual);
}
protected virtual void OnLoaded(object sender, RoutedEventArgs e)
{
this.Loaded -= new RoutedEventHandler(OnLoaded);
_hwndSrc = PresentationSource.FromDependencyObject(this) as HwndSource;
_hwndSrcHook = new HwndSourceHook(FilterMessage);
_hwndSrc.AddHook(_hwndSrcHook);
}
private static bool IsValidRestoreTarget(HwndSource source, IInputElement element)
{
if (element is DependencyObject dependencyObject)
{
return(PresentationSource.FromDependencyObject(dependencyObject) == source);
}
return(false);
}
private void FocusDefaultItem()
{
if (_lastFocusedItem?.Target is IInputElement inputElement &&
(!(inputElement is DependencyObject dependencyObject) ||
PresentationSource.FromDependencyObject(dependencyObject) != null))
{
inputElement.Focus();
}
/// <summary>
/// Gets the window handle of the HwndSource hosting this item.
/// </summary>
/// <param name="self">The item.</param>
/// <returns>The window handle, if the item is part of a valid visual tree, otherwise IntPtr.Zero.</returns>
public static IntPtr GetWindowHandle([NotNull] this DependencyObject self)
{
Contract.Requires(self != null);
var hwndSource = PresentationSource.FromDependencyObject(self) as HwndSource;
return(hwndSource?.Handle ?? IntPtr.Zero);
}
static Rect GetRealRect(FrameworkElement element)
{
if (element == null || !element.IsLoaded || PresentationSource.FromDependencyObject(element) == null)
{
return(Rect.Empty);
}
return(LayoutHelper.GetScreenRect(element));
}
public WindowCloseReason(Window window)
{
HwndSource source = (HwndSource)PresentationSource.FromDependencyObject(window);
source.AddHook(RetornaCloseReason);
CloseReason = CloseReason.None;
}
public static FrameworkElement TryGetRootVisual([NotNull] this DependencyObject item)
{
var hwndSource = (HwndSource)PresentationSource.FromDependencyObject(item);
var compositionTarget = hwndSource?.CompositionTarget;
var rootVisual = (FrameworkElement)compositionTarget?.RootVisual;
return(rootVisual);
}
private void OnLoaded(object sender, RoutedEventArgs e)
{
Loaded -= OnLoaded;
OnThemeChanged(null, null);
this.SetParentToMainWindowOf(Model.Root.Manager);
_hwndSrc = PresentationSource.FromDependencyObject(this) as HwndSource;
_hwndSrcHook = FilterMessage;
_hwndSrc?.AddHook(_hwndSrcHook);
}
public CloseReasonWindow() : base()
{
this.CloseReason = ECloseReason.NotClosed;
Loaded += delegate
{
HwndSource source = (HwndSource)PresentationSource.FromDependencyObject(this);
source.AddHook(WindowProc);
};
}
private void UpdateWindow()
{
var hwnd = ((HwndSource)PresentationSource.FromDependencyObject(this)).Handle;
RECT rect;
if (GetWindowRect(hwnd, out rect))
{
SetWindowPos(hwnd, Topmost ? -1 : -2, rect.Left, rect.Top, rect.Right - rect.Left, rect.Bottom - rect.Top, 0);
}
}
public Player(PlayerWindowType type)
{
InitializeComponent();
PlayerViewModel = new PlayerViewModel(type);
DataContext = PlayerViewModel;
SizeChanged += Player_SizeChanged;
///获取控件Handel
HwndSource hs = (HwndSource)PresentationSource.FromDependencyObject(mediaElement);
}
/// <summary>
///
/// </summary>
/// <param name="visual"></param>
/// <returns></returns>
public static IntPtr GetVisualHandle(DependencyObject visual)
{
IntPtr hwnd = IntPtr.Zero;
var source = PresentationSource.FromDependencyObject(visual);
if (source != null)
{
hwnd = ((HwndSource)source).Handle;
}
return(hwnd);
}
private ForegroundSession(UIElement element, Action onLeave)
{
_element = element;
_onLeave = onLeave;
AttachLayoutEvent();
HwndSource = PresentationSource.FromDependencyObject(_element) as HwndSource;
CallWndProcHookService.Instance.AddListener(this);
}
private static IntPtr?GetObjectParentHandle([NotNull] DependencyObject depObj)
{
if (depObj == null)
{
throw new ArgumentNullException(nameof(depObj));
}
var presentationSource = PresentationSource.FromDependencyObject(depObj) as HwndSource;
return(presentationSource?.Handle);
}
