/// <summary>
/// Invoked on every mouse click, touch screen tap, or equivalent interaction when this
/// page is active and occupies the entire window. Used to detect browser-style next and
/// previous mouse button clicks to navigate between pages.
/// </summary>
/// <param name="sender">Instance that triggered the event.</param>
/// <param name="e">Event data describing the conditions that led to the event.</param>
private void CoreWindow_PointerPressed(CoreWindow sender,
PointerEventArgs e)
{
var properties = e.CurrentPoint.Properties;
// Ignore button chords with the left, right, and middle buttons
if (properties.IsLeftButtonPressed || properties.IsRightButtonPressed ||
properties.IsMiddleButtonPressed)
{
return;
}
// If back or foward are pressed (but not both) navigate appropriately
bool backPressed = properties.IsXButton1Pressed;
bool forwardPressed = properties.IsXButton2Pressed;
if (backPressed ^ forwardPressed)
{
e.Handled = true;
if (backPressed)
{
GoBackCommand.Execute(null);
}
if (forwardPressed)
{
GoForwardCommand.Execute(null);
}
}
}
/// <summary>
/// Handle XButton events.
/// </summary>
private void OnCoreWindowPointerReleased(CoreWindow sender, PointerEventArgs args)
{
if (args.CurrentPoint.Properties.PointerUpdateKind == Windows.UI.Input.PointerUpdateKind.XButton1Released)
{
var popups = VisualTreeHelper.GetOpenPopups(Window.Current);
if (popups.Count != 0)
{
return;
}
args.Handled = true;
GoBackCommand.Execute(null);
}
else if (args.CurrentPoint.Properties.PointerUpdateKind == Windows.UI.Input.PointerUpdateKind.XButton2Released)
{
var popups = VisualTreeHelper.GetOpenPopups(Window.Current);
if (popups.Count != 0)
{
return;
}
args.Handled = true;
GoForwardCommand.Execute(null);
}
}
/// <summary>
/// Invoked on every keystroke, including system keys such as Alt key combinations, when
/// this page is active and occupies the entire window. Used to detect keyboard navigation
/// between pages even when the page itself doesn't have focus.
/// </summary>
/// <param name="sender">Instance that triggered the event.</param>
/// <param name="e">Event data describing the conditions that led to the event.</param>
private void CoreDispatcher_AcceleratorKeyActivated(CoreDispatcher sender,
AcceleratorKeyEventArgs e)
{
var virtualKey = e.VirtualKey;
// Only investigate further when Left, Right, or the dedicated Previous or Next keys
// are pressed
if ((e.EventType == CoreAcceleratorKeyEventType.SystemKeyDown ||
e.EventType == CoreAcceleratorKeyEventType.KeyDown) &&
(virtualKey == VirtualKey.Left || virtualKey == VirtualKey.Right ||
(int)virtualKey == 166 || (int)virtualKey == 167))
{
var coreWindow = Window.Current.CoreWindow;
var downState = CoreVirtualKeyStates.Down;
bool menuKey = (coreWindow.GetKeyState(VirtualKey.Menu) & downState) == downState;
bool controlKey = (coreWindow.GetKeyState(VirtualKey.Control) & downState) == downState;
bool shiftKey = (coreWindow.GetKeyState(VirtualKey.Shift) & downState) == downState;
bool noModifiers = !menuKey && !controlKey && !shiftKey;
bool onlyAlt = menuKey && !controlKey && !shiftKey;
if (((int)virtualKey == 166 && noModifiers) ||
(virtualKey == VirtualKey.Left && onlyAlt))
{
// When the previous key or Alt+Left are pressed navigate back
e.Handled = true;
GoBackCommand.Execute(null);
}
else if (((int)virtualKey == 167 && noModifiers) ||
(virtualKey == VirtualKey.Right && onlyAlt))
{
// When the next key or Alt+Right are pressed navigate forward
e.Handled = true;
GoForwardCommand.Execute(null);
}
}
}
