private void SetCreateMoveScrollArgsAndTriggerEvent(double newViewWidth,
double newViewHeight, double newMiddleOfViewX, double newMiddleOfViewY)
{
CurrentViewDimensions = new ViewDimensions(newViewWidth,
newViewHeight, newMiddleOfViewX, newMiddleOfViewY);
MoveScrollArgs args = GetMoveScrollArgs(CurrentViewDimensions);
if (!AreViewDimensionsPossible(CurrentViewDimensions))
{
return;
}
MoveScrollView(this, args);
canvas.Invalidate();
}
private void Canvas_PointerPressed(object sender, PointerRoutedEventArgs e)
{
pointerPoints.Add(e.GetCurrentPoint(canvas));
var isBool = canvas.CapturePointer(e.Pointer);
var list = canvas.PointerCaptures.ToArray();
startAverageDistanceWidthPossible = startAverageDistanceHeightPossible = true;
GetAverageDistanceBetweenPointers(out startAverageDistanceWidth, out startAverageDistanceHeight);
GetAverageMiddlePointOfPointers(out startAveragePointX, out startAveragePointY);
preMoveTicks = DateTime.Now.Ticks;
startViewDimensions = CurrentViewDimensions.Clone();
}
public void SetEvents(CanvasControl canvas, UIElement grid, float viewValueWidth,
float viewValueHeight, float middleOfViewX, float middleOfViewY)
{
this.canvas = canvas;
CurrentViewDimensions = new ViewDimensions(viewValueWidth,
viewValueHeight, middleOfViewX, middleOfViewY);
grid.PointerPressed += Canvas_PointerPressed;
grid.PointerMoved += Canvas_PointerMoved;
grid.PointerReleased += Canvas_PointerReleased;
grid.PointerWheelChanged += Canvas_PointerWheelChanged;
canvas.SizeChanged += Canvas_SizeChanged;
}
private void Canvas_PointerReleased(object sender, PointerRoutedEventArgs e)
{
int index = pointerPoints.FindIndex(x => x.PointerId == e.Pointer.PointerId);
if (index != -1)
{
pointerPoints.RemoveAt(index);
canvas.ReleasePointerCapture(e.Pointer);
startAverageDistanceWidthPossible = startAverageDistanceHeightPossible = true;
GetAverageDistanceBetweenPointers(out startAverageDistanceWidth, out startAverageDistanceHeight);
GetAverageMiddlePointOfPointers(out startAveragePointX, out startAveragePointY);
startViewDimensions = CurrentViewDimensions.Clone();
}
}
private bool AreViewDimensionsPossible(ViewDimensions viewDimensions)
{
if (float.IsInfinity(viewDimensions.BottomRightValuePoint.X))
{
return(false);
}
if (float.IsInfinity(viewDimensions.BottomRightValuePoint.Y))
{
return(false);
}
if (float.IsInfinity(viewDimensions.MiddleOfViewValuePoint.X))
{
return(false);
}
if (float.IsInfinity(viewDimensions.MiddleOfViewValuePoint.Y))
{
return(false);
}
if (float.IsInfinity(viewDimensions.TopLeftValuePoint.X))
{
return(false);
}
if (float.IsInfinity(viewDimensions.TopLeftValuePoint.Y))
{
return(false);
}
if (float.IsInfinity(viewDimensions.ViewValueSize.X))
{
return(false);
}
if (float.IsInfinity(viewDimensions.ViewValueSize.Y))
{
return(false);
}
if (float.IsNaN(viewDimensions.BottomRightValuePoint.X))
{
return(false);
}
if (float.IsNaN(viewDimensions.BottomRightValuePoint.Y))
{
return(false);
}
if (float.IsNaN(viewDimensions.MiddleOfViewValuePoint.X))
{
return(false);
}
if (float.IsNaN(viewDimensions.MiddleOfViewValuePoint.Y))
{
return(false);
}
if (float.IsNaN(viewDimensions.TopLeftValuePoint.X))
{
return(false);
}
if (float.IsNaN(viewDimensions.TopLeftValuePoint.Y))
{
return(false);
}
if (float.IsNaN(viewDimensions.ViewValueSize.X))
{
return(false);
}
if (float.IsNaN(viewDimensions.ViewValueSize.Y))
{
return(false);
}
return(true);
}
private MoveScrollArgs GetMoveScrollArgs(ViewDimensions newViewDimensions)
{
return(new MoveScrollArgs(newViewDimensions.Clone()));
}