/// <summary>
/// Called when a Mouse Button is pressed on the parent <see cref="SciChartSurface"/>
/// </summary>
/// <param name="e">Arguments detailing the mouse button operation</param>
/// <remarks></remarks>
public override void OnModifierMouseDown(ModifierMouseArgs e)
{
base.OnModifierMouseDown(e);
if (_isDragging || !MatchesExecuteOn(e.MouseButtons, ExecuteOn))
{
return;
}
// Exit if the mouse down was outside the bounds of the ModifierSurface
if (e.IsMaster && !ModifierSurface.GetBoundsRelativeTo(ModifierSurface).Contains(e.MousePoint))
{
return;
}
e.Handled = true;
ModifierSurface.CaptureMouse();
// Translate the mouse point (which is in RootGrid coordiantes) relative to the ModifierSurface
// This accounts for any offset due to left Y-Axis
Point ptTrans = RootGrid.TranslatePoint(e.MousePoint, ModifierSurface);
_startPoint = ptTrans;
_rectangle = new Rect();
SetPosition(_startPoint, _startPoint);
_isDragging = true;
}
/// <summary>
/// Called when a Mouse Button is pressed on the parent <see cref="SciChartSurface" />
/// </summary>
/// <param name="e">Arguments detailing the mouse button operation</param>
public override void OnModifierMouseDown(ModifierMouseArgs e)
{
base.OnModifierMouseDown(e);
// Check the ExecuteOn property and if we are already dragging. If so, exit
if (_isDragging || !MatchesExecuteOn(e.MouseButtons, ExecuteOn))
{
return;
}
// Check the mouse point was inside the ModifierSurface (the central chart area). If not, exit
var modifierSurfaceBounds = ModifierSurface.GetBoundsRelativeTo(RootGrid);
if (!modifierSurfaceBounds.Contains(e.MousePoint))
{
return;
}
// Capture the mouse, so if mouse goes out of bounds, we retain mouse events
if (e.IsMaster)
{
ModifierSurface.CaptureMouse();
}
// Translate the mouse point (which is in RootGrid coordiantes) relative to the ModifierSurface
// This accounts for any offset due to left Y-Axis
var ptTrans = GetPointRelativeTo(e.MousePoint, ModifierSurface);
_startPoint = ptTrans;
_rectangle = new Rectangle
{
Style = SelectionPolygonStyle,
};
// Update the zoom recticule position
SetReticulePosition(_rectangle, _startPoint, _startPoint, e.IsMaster);
// Add the zoom reticule to the ModifierSurface - a canvas over the chart
ModifierSurface.Children.Add(_rectangle);
// Set flag that a drag has begun
_isDragging = true;
}