bool processDragDropControl(IObservable <Point> dragDrop)
{
bool beginControlKey = ControlKey() && !ShiftKey();
bool beginShiftKey = !ControlKey() && ShiftKey();
if (beginControlKey || beginShiftKey)
{
_chartStatus = activatingStatus.ChartStatus;
activatingStatus.ChartStatus = ChartsStatus.缩放海图;
Mouse.Capture(this);
Point pointBegin = Mouse.GetPosition(this);
Point point = new Point();
rect.Margin = new Thickness(pointBegin.X, pointBegin.Y, 0, 0);
rect.Width = 0;
rect.Height = 0;
rect.Visibility = System.Windows.Visibility.Visible;
dragDrop = dragDrop.Skip(1).Zip(dragDrop, (i1, i2) => new Point(i1.X - i2.X, i1.Y - i2.Y));
dragDrop.Subscribe(
p =>
{
if (activatingStatus.ChartStatus == ChartsStatus.缩放海图)
{
point.X += p.X;
point.Y += p.Y;
rect.Width = Math.Abs(point.X);
rect.Height = Math.Abs(point.Y);
if (point.X < 0 || point.Y < 0)
{
rect.Margin = new Thickness(pointBegin.X + Math.Min(0, point.X), pointBegin.Y + Math.Min(0, point.Y), 0, 0);
}
}
},
async() =>
{
Mouse.Capture(null);
MapPoint position = map.Locator.ScreenToMap(pointBegin.X + point.X / 2, pointBegin.Y + point.Y / 2);
double zoom = Math.Max(Math.Abs(point.X) / this.ActualWidth, Math.Abs(point.Y) / this.ActualHeight);
double scale = map.Locator.Scale;
zoom = Math.Max(zoom, 0.01);
scale = beginControlKey ? scale * zoom : scale / zoom;
await map.Locator.Locate(scale, position);
activatingStatus.ChartStatus = _chartStatus;
rect.Visibility = System.Windows.Visibility.Collapsed;
});
return(true);
}
return(false);
}
private ActivatingStatus()
{
_chartStatus = ChartsStatus.移动海图;
_tragStatus = TraggingStatus.海图模式;
}