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// Licensed under the MIT License.
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;
using System.Windows;
using System.Windows.Input;
namespace Microsoft.Management.UI.Internal
{
internal enum LogicalDirection
{
None,
Left,
Right
}
internal static class KeyboardHelp
{
/// <summary>
/// Gets the logical direction for a key, taking into account RTL settings.
/// </summary>
/// <param name="element">The element to get FlowDirection from.</param>
/// <param name="key">The key pressed.</param>
/// <returns>The logical direction.</returns>
public static LogicalDirection GetLogicalDirection(DependencyObject element, Key key)
{
Debug.Assert(element != null, "element not null");
bool rightToLeft = IsElementRightToLeft(element);
switch (key)
{
case Key.Right:
if (rightToLeft)
{
return LogicalDirection.Left;
}
else
{
return LogicalDirection.Right;
}
case Key.Left:
if (rightToLeft)
{
return LogicalDirection.Right;
}
else
{
return LogicalDirection.Left;
}
default:
return LogicalDirection.None;
}
}
/// <summary>
/// Gets the focus direction for a key, taking into account RTL settings.
/// </summary>
/// <param name="element">The element to get FlowDirection from.</param>
/// <param name="key">The key pressed.</param>
/// <returns>The focus direction.</returns>
public static FocusNavigationDirection GetNavigationDirection(DependencyObject element, Key key)
{
Debug.Assert(element != null, "element not null");
Debug.Assert(IsFlowDirectionKey(key));
bool rightToLeft = IsElementRightToLeft(element);
switch (key)
{
case Key.Right:
if (rightToLeft)
{
return FocusNavigationDirection.Left;
}
else
{
return FocusNavigationDirection.Right;
}
case Key.Left:
if (rightToLeft)
{
return FocusNavigationDirection.Right;
}
else
{
return FocusNavigationDirection.Left;
}
case Key.Down:
return FocusNavigationDirection.Down;
case Key.Up:
return FocusNavigationDirection.Up;
default:
Debug.Fail("Non-direction key specified");
return FocusNavigationDirection.First;
}
}
/// <summary>
/// Determines if the control key is pressed.
/// </summary>
/// <returns>True if a control is pressed.</returns>
public static bool IsControlPressed()
{
if ((Keyboard.Modifiers & ModifierKeys.Control) == ModifierKeys.Control)
{
return true;
}
else
{
return false;
}
}
/// <summary>
/// Determines if the key is a navigation key.
/// </summary>
/// <param name="key">The key pressed.</param>
/// <returns>True if the key is a navigation key.</returns>
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
private static bool IsFlowDirectionKey(Key key)
{
switch (key)
{
case Key.Right:
case Key.Left:
case Key.Down:
case Key.Up:
return true;
default:
return false;
}
}
private static bool IsElementRightToLeft(DependencyObject element)
{
FlowDirection flowDirection = FrameworkElement.GetFlowDirection(element);
bool rightToLeft = flowDirection == FlowDirection.RightToLeft;
return rightToLeft;
}
}
}
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