public DZContext(MultiScaleImage msi)
{
TargetViewportWidth = 1;
MinViewportWidth = .05;
MaxViewportWidth = 2;
Owner = msi;
Owner.UseSprings = false;
Owner.ViewportChanged += new RoutedEventHandler(Owner_ViewportChanged);
ImagesToHide = new List<MultiScaleSubImage>();
ImagesToShow = new List<MultiScaleSubImage>();
/* ---------------------------------------------------------------------------------------------------
-- Start Mouse and Keyboard handler for the MultiScaleImage --
This block of code is the mouse and keyboard handler for the DeepZoom control.
Parts of this code is borrowed from Scott Hanselman's and Soul Solutions blogs
// Based on prior work done by Lutz Gerhard, Peter Blois, and Scott Hanselman
---------------------------------------------------------------------------------------------------- */
bool mouseButtonPressed = false;
bool dragInProgress = false;
Point dragOffset = new Point();
Point currentPosition = new Point();
msi.ImageOpenSucceeded += new RoutedEventHandler(msi_ImageOpenSucceeded);
msi.MotionFinished += new RoutedEventHandler(ArrangeOnFirstMotionFinished_MotionFinished);
/* KeyDown += delegate(object sender, KeyEventArgs e)
{
Point p = msi.ElementToLogicalPoint(new Point((msi.Width / 2), ((msi.Width / msi.AspectRatio) / 2)));
switch (e.Key)
{
case Key.I:
case Key.C:
case Key.Add:
msi.ZoomAboutLogicalPoint(1.1, p.X, p.Y);
break;
case Key.O:
case Key.Space:
case Key.Subtract:
msi.ZoomAboutLogicalPoint(0.9, p.X, p.Y);
break;
case Key.Left:
case Key.A:
msi.ViewportOrigin = new Point(msi.ViewportOrigin.X - 0.1, msi.ViewportOrigin.Y);
break;
case Key.Right:
case Key.D:
msi.ViewportOrigin = new Point(msi.ViewportOrigin.X + 0.1, msi.ViewportOrigin.Y);
break;
case Key.Up:
case Key.W:
msi.ViewportOrigin = new Point(msi.ViewportOrigin.X, msi.ViewportOrigin.Y - 0.1);
break;
case Key.Down:
case Key.S:
msi.ViewportOrigin = new Point(msi.ViewportOrigin.X, msi.ViewportOrigin.Y + 0.1);
break;
case Key.R:
RandomizeAndArrange();
break;
}
};
*/
msi.MouseWheel += delegate(object sender, MouseWheelEventArgs e)
{
DZContext context = this;
if (!context.IsMouseWheelEnabled)
return;
e.Handled = true;
if (e.Delta > 0)
msi.Zoom(1.2, context.LastMousePosition); //, context.IsZoomForceEnabled);
else
msi.Zoom(0.8, context.LastMousePosition); //, context.IsZoomForceEnabled);
context.ClickedImageIndex = -1;
};
msi.MouseLeave += delegate(object sender, MouseEventArgs e)
{
if (mouseButtonPressed)
{
mouseButtonPressed = false;
dragInProgress = false;
}
};
msi.MouseLeftButtonDown += delegate(object sender, MouseButtonEventArgs e)
{
mouseButtonPressed = false;
if (IsMousePanEnabled)
{
mouseButtonPressed = true;
}
dragInProgress = false;
dragOffset = e.GetPosition(msi);
currentPosition = msi.ViewportOrigin;
ClickedImageIndex = -1;
};
msi.MouseMove += delegate(object sender, MouseEventArgs e)
{
if (mouseButtonPressed)
{
dragInProgress = true;
Point newOrigin = new Point();
newOrigin.X = currentPosition.X - (((e.GetPosition(msi).X - dragOffset.X) / msi.ActualWidth) * msi.ViewportWidth);
newOrigin.Y = currentPosition.Y - (((e.GetPosition(msi).Y - dragOffset.Y) / msi.ActualHeight) * msi.ViewportWidth);
msi.ViewportOrigin = newOrigin;
}
LastMousePosition = e.GetPosition(msi);
};
msi.MouseLeftButtonUp += delegate(object sender, MouseButtonEventArgs e)
{
if (mouseButtonPressed && !dragInProgress)
{
Point p = msi.ElementToLogicalPoint(e.GetPosition(msi));
int subImageIndex = msi.SubImageHitTest(p);
if (subImageIndex >= 0)
{
msi.DisplaySubImageCentered(subImageIndex);
ClickedImageIndex = subImageIndex;
}
if (IsZoomOnClickEnabled)
{
bool shiftDown = (Keyboard.Modifiers & ModifierKeys.Shift) == ModifierKeys.Shift;
if (shiftDown)
msi.Zoom(0.5, e.GetPosition(msi));
else
msi.Zoom(2.0, e.GetPosition(msi));
}
}
mouseButtonPressed = false;
dragInProgress = false;
};
}
