// </Snippet_GamePiece_ProcessInertia>
// <Snippet_GamePiece_UpdateFromMouse>
#region UpdateFromMouse
public bool UpdateFromMouse(MouseState mouseState)
{
if (mouseState.LeftButton == ButtonState.Released)
{
if (isMouseCaptured)
{
manipulationProcessor.CompleteManipulation(Timestamp);
}
isMouseCaptured = false;
}
if (isMouseCaptured ||
(mouseState.LeftButton == ButtonState.Pressed &&
bounds.Contains(mouseState.X, mouseState.Y)))
{
isMouseCaptured = true;
Manipulator2D[] manipulators = new Manipulator2D[]
{
new Manipulator2D(0, mouseState.X, mouseState.Y)
};
dragPoint.X = mouseState.X;
dragPoint.Y = mouseState.Y;
manipulationProcessor.ProcessManipulators(Timestamp, manipulators);
}
// If the right button is pressed, stop the piece and move it to the center.
if (mouseState.RightButton == ButtonState.Pressed)
{
processInertia = false;
X = viewport.Width / 2;
Y = viewport.Height / 2;
rotation = 0;
}
return(isMouseCaptured);
}
/// <summary>
/// Handles the Affine2DManipulationDelta event of the ManipulationProcessor. Attempts to distinguish scroll gestures
/// from those intended to manipulate the parent ScatterViewItem.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="System.Windows.Input.Manipulation2DDeltaEventArgs"/> instance containing the event data.</param>
private void ManipulationProcessor_Delta(object sender, Manipulation2DDeltaEventArgs e)
{
if (_scatterViewItem == null)
{
// Hook up an event to the parent SVI. When it loses a contact, the ScrollViewer should capture them again.
_scatterViewItem = AssociatedObject.FindVisualParent <ScatterViewItem>();
_scatterViewItem.PreviewTouchUp += ScatterViewItem_PreviewContactUp;
}
if (_scatterViewItem == null)
{
// There's no SVI, so don't do anything.
return;
}
if (e.Delta.ExpansionX != 0 || e.Delta.ExpansionY != 0 || e.Delta.Rotation != 0)
{
// If any scale or rotation is detected, pass that to the SVI.
GiveControlToScatterViewItem();
return;
}
Vector translation = new Vector((double)e.Cumulative.TranslationX, (double)e.Cumulative.TranslationY);
if (Math.Abs(translation.Length) < 10)
{
// There's no translation, so don't do anything.
return;
}
if (AssociatedObject.ComputedHorizontalScrollBarVisibility == Visibility.Collapsed && AssociatedObject.ComputedVerticalScrollBarVisibility == Visibility.Collapsed)
{
// There are no scrollbars, so pass all translations to the SVI.
GiveControlToScatterViewItem();
return;
}
if (translation.Length >= SensitivityDistance)
{
// The scroll has gone for some distance, so assume the gesture is intended as a scroll and never do a drag.
_manipulationProcessor.CompleteManipulation(DateTime.UtcNow.Ticks);
return;
}
double translationAngle = Math.Abs(Math.Atan2(e.Cumulative.TranslationX, e.Cumulative.TranslationY) * (180 / Math.PI));
if (AssociatedObject.ComputedVerticalScrollBarVisibility == Visibility.Visible && AssociatedObject.ComputedHorizontalScrollBarVisibility == Visibility.Collapsed)
{
// The ScrollViewer is scrolling vertically.
if (translationAngle >= 90 - SensitivityAngle && translationAngle <= 90 + SensitivityAngle)
{
// The gesture scrolled horizontally, so pass that to the SVI.
GiveControlToScatterViewItem();
}
}
else if (AssociatedObject.ComputedVerticalScrollBarVisibility == Visibility.Collapsed && AssociatedObject.ComputedHorizontalScrollBarVisibility == Visibility.Visible)
{
// The ScrollViewer is scrolling horizontally.
if (e.Cumulative.TranslationX < 0)
{
// The gesture is scrolling to the left.
if (180 - translationAngle < SensitivityAngle)
{
// But it's close enough to vertical that it should go to the SVI.
GiveControlToScatterViewItem();
}
}
else if (e.Cumulative.TranslationX > 0)
{
// The gesture is scrolling to the right.
if (translationAngle <= SensitivityAngle)
{
// But it's close enough to vertical that it should go to the SVI.
GiveControlToScatterViewItem();
}
}
}
}