/// <summary>
/// S'assure que les zoom opérations existent.
/// </summary>
/// <param name="zoomable">The zoomable.</param>
/// <param name="chart">The chart.</param>
private void EnsureOperations(IZoommerGantt zoomable, KGanttChartView chart)
{
if (_zoomOperations == null)
{
_zoomOperations = new Subject <ZoomAction>();
_zoomOperations
.BufferWithInactivity(TimeSpan.FromMilliseconds(200))
.Take(1)
.ObserveOnDispatcher()
.Subscribe(actions =>
{
ExecuteZoomActions(zoomable, chart, actions);
_zoomOperations.OnCompleted();
_zoomOperations.Dispose();
_zoomOperations = null;
});
}
}
/// <summary>
/// Execute les différentes actions de zoom mise en file.
/// </summary>
/// <param name="zoomable">Le gantt.</param>
/// <param name="chart">Le chart.</param>
/// <param name="actions">Les actions.</param>
private void ExecuteZoomActions(IZoommerGantt zoomable, KGanttChartView chart, IEnumerable <ZoomAction> actions)
{
double zoomX = zoomable.ZoomX;
double zoomY = zoomable.ZoomY;
double verticalOffset = chart.ScrollVerticalOffset;
double horizontalOffset = chart.ScrollHorizontalOffset;
bool scrollHorizontal = false;
bool scrollVertical = false;
foreach (var action in actions)
{
switch (action.Action)
{
case ZoomActionEnum.ZoomXIn:
{
double delta = zoomX * 1.2 - zoomX;
zoomX += delta;
horizontalOffset += action.MousePosition.X * delta;
scrollHorizontal = true;
}
break;
case ZoomActionEnum.ZoomXOut:
{
double delta = zoomX / 1.2 - zoomX;
zoomX += delta;
horizontalOffset += action.MousePosition.X * delta;
scrollHorizontal = true;
}
break;
case ZoomActionEnum.ZoomYIn:
{
double delta = zoomY * 1.2 - zoomY;
zoomY += delta;
verticalOffset += action.MousePosition.Y * delta;
scrollVertical = true;
}
break;
case ZoomActionEnum.ZoomYOut:
{
double delta = zoomY / 1.2 - zoomY;
zoomY += delta;
verticalOffset += action.MousePosition.Y * delta;
scrollVertical = true;
}
break;
case ZoomActionEnum.ScrollRight:
horizontalOffset += 48;
scrollHorizontal = true;
break;
case ZoomActionEnum.ScrollLeft:
horizontalOffset -= 48;
scrollHorizontal = true;
break;
default:
throw new ArgumentOutOfRangeException("action");
}
}
ApplyZoom(zoomX, zoomY);
if (scrollHorizontal)
{
chart.DeferScrollToHorizontalOffset(horizontalOffset);
}
if (scrollVertical)
{
chart.DeferScrollToVerticalOffset(verticalOffset);
}
SetBusy(false, chart);
}