/// <summary>
/// Recalculates OS coordinates in order to support WPFs coordinate
/// system if OS scaling (DPIs) is not 100%.
/// </summary>
/// <param name="point"></param>
/// <returns></returns>
private Point GetDeviceCoordinates(Point point)
{
if (double.IsNaN(scalingFactor))
{
//calculate scaling factor in order to support non-standard DPIs
var presentationSource = PresentationSource.FromVisual(this);
if (presentationSource == null)
{
scalingFactor = 1;
}
else
{
var transform = presentationSource.CompositionTarget.TransformToDevice;
scalingFactor = 1 / transform.M11;
}
}
//on standard DPI settings, just return the point
if (scalingFactor == 1.0)
{
return(point);
}
return(new Point()
{
X = (int)(point.X * scalingFactor), Y = (int)(point.Y * scalingFactor)
});
}
/// <summary>
/// Displays the <see cref="TrayPopup"/> control if
/// it was set.
/// </summary>
private void ShowTrayPopup(Point cursorPosition)
{
if (IsDisposed)
{
return;
}
//raise preview event no matter whether popup is currently set
//or not (enables client to set it on demand)
var args = RaisePreviewTrayPopupOpenEvent();
if (args.Handled)
{
return;
}
if (TrayPopup != null)
{
//use absolute position, but place the popup centered above the icon
TrayPopupResolved.Placement = PlacementMode.AbsolutePoint;
TrayPopupResolved.HorizontalOffset = cursorPosition.X;
TrayPopupResolved.VerticalOffset = cursorPosition.Y;
//open popup
TrayPopupResolved.IsOpen = true;
IntPtr handle = IntPtr.Zero;
if (TrayPopupResolved.Child != null)
{
//try to get a handle on the popup itself (via its child)
HwndSource source = (HwndSource)PresentationSource.FromVisual(TrayPopupResolved.Child);
if (source != null)
{
handle = source.Handle;
}
}
//if we don't have a handle for the popup, fall back to the message sink
if (handle == IntPtr.Zero)
{
handle = messageSink.MessageWindowHandle;
}
//activate either popup or message sink to track deactivation.
//otherwise, the popup does not close if the user clicks somewhere else
WinApi.SetForegroundWindow(handle);
//raise attached event - item should never be null unless developers
//changed the CustomPopup directly...
if (TrayPopup != null)
{
RaisePopupOpenedEvent(TrayPopup);
}
//bubble routed event
RaiseTrayPopupOpenEvent();
}
}
/// <summary>
/// Displays the <see cref="ContextMenu"/> if
/// it was set.
/// </summary>
private void ShowContextMenu(Point cursorPosition)
{
if (IsDisposed)
{
return;
}
//raise preview event no matter whether context menu is currently set
//or not (enables client to set it on demand)
var args = RaisePreviewTrayContextMenuOpenEvent();
if (args.Handled)
{
return;
}
if (ContextMenu != null)
{
//use absolute positioning. We need to set the coordinates, or a delayed opening
//(e.g. when left-clicked) opens the context menu at the wrong place if the mouse
//is moved!
ContextMenu.Placement = PlacementMode.AbsolutePoint;
ContextMenu.HorizontalOffset = cursorPosition.X;
ContextMenu.VerticalOffset = cursorPosition.Y;
ContextMenu.IsOpen = true;
IntPtr handle = IntPtr.Zero;
//try to get a handle on the context itself
HwndSource source = (HwndSource)PresentationSource.FromVisual(ContextMenu);
if (source != null)
{
handle = source.Handle;
}
//if we don't have a handle for the popup, fall back to the message sink
if (handle == IntPtr.Zero)
{
handle = messageSink.MessageWindowHandle;
}
//activate the context menu or the message window to track deactivation - otherwise, the context menu
//does not close if the user clicks somewhere else. With the message window
//fallback, the context menu can't receive keyboard events - should not happen though
WinApi.SetForegroundWindow(handle);
//bubble event
RaiseTrayContextMenuOpenEvent();
}
}
/// <summary>
/// Processes mouse events, which are bubbled
/// through the class' routed events, trigger
/// certain actions (e.g. show a popup), or
/// both.
/// </summary>
/// <param name="me">Event flag.</param>
private void OnMouseEvent(MouseEvent me)
{
if (IsDisposed)
{
return;
}
switch (me)
{
case MouseEvent.MouseMove:
RaiseTrayMouseMoveEvent();
//immediately return - there's nothing left to evaluate
return;
case MouseEvent.IconRightMouseDown:
RaiseTrayRightMouseDownEvent();
break;
case MouseEvent.IconLeftMouseDown:
RaiseTrayLeftMouseDownEvent();
break;
case MouseEvent.IconRightMouseUp:
RaiseTrayRightMouseUpEvent();
break;
case MouseEvent.IconLeftMouseUp:
RaiseTrayLeftMouseUpEvent();
break;
case MouseEvent.IconMiddleMouseDown:
RaiseTrayMiddleMouseDownEvent();
break;
case MouseEvent.IconMiddleMouseUp:
RaiseTrayMiddleMouseUpEvent();
break;
case MouseEvent.IconDoubleClick:
//cancel single click timer
singleClickTimer.Change(Timeout.Infinite, Timeout.Infinite);
//bubble event
RaiseTrayMouseDoubleClickEvent();
break;
case MouseEvent.BalloonToolTipClicked:
RaiseTrayBalloonTipClickedEvent();
break;
default:
throw new ArgumentOutOfRangeException("me", "Missing handler for mouse event flag: " + me);
}
//get mouse coordinates
Point cursorPosition = new Point();
if (messageSink.Version == NotifyIconVersion.Vista)
{
//physical cursor position is supported for Vista and above
WinApi.GetPhysicalCursorPos(ref cursorPosition);
}
else
{
WinApi.GetCursorPos(ref cursorPosition);
}
cursorPosition = GetDeviceCoordinates(cursorPosition);
bool isLeftClickCommandInvoked = false;
//show popup, if requested
if (me.IsMatch(PopupActivation))
{
if (me == MouseEvent.IconLeftMouseUp)
{
//show popup once we are sure it's not a double click
singleClickTimerAction = () =>
{
LeftClickCommand.ExecuteIfEnabled(LeftClickCommandParameter, LeftClickCommandTarget ?? this);
ShowTrayPopup(cursorPosition);
};
singleClickTimer.Change(WinApi.GetDoubleClickTime(), Timeout.Infinite);
isLeftClickCommandInvoked = true;
}
else
{
//show popup immediately
ShowTrayPopup(cursorPosition);
}
}
//show context menu, if requested
if (me.IsMatch(MenuActivation))
{
if (me == MouseEvent.IconLeftMouseUp)
{
//show context menu once we are sure it's not a double click
singleClickTimerAction = () =>
{
LeftClickCommand.ExecuteIfEnabled(LeftClickCommandParameter, LeftClickCommandTarget ?? this);
ShowContextMenu(cursorPosition);
};
singleClickTimer.Change(WinApi.GetDoubleClickTime(), Timeout.Infinite);
isLeftClickCommandInvoked = true;
}
else
{
//show context menu immediately
ShowContextMenu(cursorPosition);
}
}
//make sure the left click command is invoked on mouse clicks
if (me == MouseEvent.IconLeftMouseUp && !isLeftClickCommandInvoked)
{
//show context menu once we are sure it's not a double click
singleClickTimerAction =
() =>
{
LeftClickCommand.ExecuteIfEnabled(LeftClickCommandParameter, LeftClickCommandTarget ?? this);
};
singleClickTimer.Change(WinApi.GetDoubleClickTime(), Timeout.Infinite);
}
}
/// <summary>
/// Shows a custom control as a tooltip in the tray location.
/// </summary>
/// <param name="balloon"></param>
/// <param name="animation">An optional animation for the popup.</param>
/// <param name="timeout">The time after which the popup is being closed.
/// Submit null in order to keep the balloon open inde
/// </param>
/// <exception cref="ArgumentNullException">If <paramref name="balloon"/>
/// is a null reference.</exception>
public void ShowCustomBalloon(UIElement balloon, PopupAnimation animation, int?timeout)
{
Dispatcher dispatcher = this.GetDispatcher();
if (!dispatcher.CheckAccess())
{
var action = new Action(() => ShowCustomBalloon(balloon, animation, timeout));
dispatcher.Invoke(DispatcherPriority.Normal, action);
return;
}
if (balloon == null)
{
throw new ArgumentNullException("balloon");
}
if (timeout.HasValue && timeout < 500)
{
string msg = "Invalid timeout of {0} milliseconds. Timeout must be at least 500 ms";
msg = String.Format(msg, timeout);
throw new ArgumentOutOfRangeException("timeout", msg);
}
EnsureNotDisposed();
//make sure we don't have an open balloon
lock (this)
{
CloseBalloon();
}
//create an invisible popup that hosts the UIElement
Popup popup = new Popup();
popup.AllowsTransparency = true;
//provide the popup with the taskbar icon's data context
UpdateDataContext(popup, null, DataContext);
//don't animate by default - devs can use attached
//events or override
popup.PopupAnimation = animation;
//in case the balloon is cleaned up through routed events, the
//control didn't remove the balloon from its parent popup when
//if was closed the last time - just make sure it doesn't have
//a parent that is a popup
var parent = LogicalTreeHelper.GetParent(balloon) as Popup;
if (parent != null)
{
parent.Child = null;
}
if (parent != null)
{
string msg =
"Cannot display control [{0}] in a new balloon popup - that control already has a parent. You may consider creating new balloons every time you want to show one.";
msg = String.Format(msg, balloon);
throw new InvalidOperationException(msg);
}
popup.Child = balloon;
//don't set the PlacementTarget as it causes the popup to become hidden if the
//TaskbarIcon's parent is hidden, too...
//popup.PlacementTarget = this;
popup.Placement = PlacementMode.AbsolutePoint;
popup.StaysOpen = true;
Point position = TrayInfo.GetTrayLocation();
position = GetDeviceCoordinates(position);
popup.HorizontalOffset = position.X - 1;
popup.VerticalOffset = position.Y - 1;
//store reference
lock (this)
{
SetCustomBalloon(popup);
}
//assign this instance as an attached property
SetParentTaskbarIcon(balloon, this);
//fire attached event
RaiseBalloonShowingEvent(balloon, this);
//display item
popup.IsOpen = true;
if (timeout.HasValue)
{
//register timer to close the popup
balloonCloseTimer.Change(timeout.Value, Timeout.Infinite);
}
}