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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using MS.Internal;
using System.Windows.Media;
namespace System.Windows.Input.StylusPointer
{
/// <summary>
/// A WM_POINTER specific implementation of StylusTouchDeviceBase.
/// </summary>
internal sealed class PointerTouchDevice : StylusTouchDeviceBase
{
#region Member Variables
/// <summary>
/// The owning StylusDevice
/// </summary>
private PointerStylusDevice _stylusDevice;
#endregion
#region Constructor
internal PointerTouchDevice(PointerStylusDevice stylusDevice)
: base(stylusDevice)
{
_stylusDevice = stylusDevice;
}
#endregion
#region Manipulation
protected override void OnManipulationEnded(bool cancel)
{
base.OnManipulationEnded(cancel);
if (cancel)
{
// Set PromotingToOther to true because the
// the manipulation has been canceled and hence
// we want the promotions to happen.
PromotingToOther = true;
}
else
{
// Set PromotingToOther to false because we
// dont want any mouse promotions to happen for
// rest of this touch cycle.
PromotingToOther = false;
}
}
protected override void OnManipulationStarted()
{
base.OnManipulationStarted();
PromotingToOther = false;
}
#endregion
#region StylusTouchDeviceBase Implementation
/// <summary>
/// Get the width or height of the stylus point's bounding box.
/// </summary>
/// <param name="stylusPoint">The point for which the width or height is being calculated</param>
/// <param name="isWidth">True if this should calculate width, false for height</param>
/// <returns>The width or height of the stylus poing</returns>
protected override double GetStylusPointWidthOrHeight(StylusPoint stylusPoint, bool isWidth)
{
double pixelsPerInch = DpiUtil.DefaultPixelsPerInch;
// If we have an active source and root visual use the DPI from there
if (ActiveSource?.RootVisual != null)
{
pixelsPerInch = VisualTreeHelper.GetDpi(ActiveSource.RootVisual).PixelsPerInchX;
}
StylusPointProperty property = (isWidth ? StylusPointProperties.Width : StylusPointProperties.Height);
double value = 0d;
if (stylusPoint.HasProperty(property))
{
// Get the property value in the corresponding units
value = (double)stylusPoint.GetPropertyValue(property);
StylusPointPropertyInfo propertyInfo = stylusPoint.Description.GetPropertyInfo(property);
if (!DoubleUtil.AreClose(propertyInfo.Resolution, 0d))
{
value /= propertyInfo.Resolution;
}
else
{
value = 0;
}
// Convert the value to Inches
if (propertyInfo.Unit == StylusPointPropertyUnit.Centimeters)
{
value /= CentimetersPerInch;
}
// Convert the value to pixels
value *= pixelsPerInch;
}
return value;
}
protected override void OnActivateImpl()
{
// Note this is not needed for pointer stack. It is here that WISP stack
// sets primary pointer for mouse promotion, but this is now tracked by windows.
}
protected override void OnDeactivateImpl()
{
// Note this is not needed for the pointer stack. In the WISP stack this clears
// mouse promotion and staging vars.
}
#endregion
}
}
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