protected override void OnMouseWheel(MouseEventArgs e)
{
base.OnMouseWheel(e);
if (_isFocused && _isKnobRotating && KryptonKnobUtilities.IsPointinRectangle(new Point(e.X, e.Y), _rKnob))
{
// the Delta value is always 120, as explained in MSDN
int v = (e.Delta / 120) * (_maximum - _minimum) / _mouseWheelBarPartitions;
SetProperValue(Value + v);
// Avoid to send MouseWheel event to the parent container
((HandledMouseEventArgs)e).Handled = true;
}
}
protected override void OnMouseUp(MouseEventArgs e)
{
if (KryptonKnobUtilities.IsPointinRectangle(new Point(e.X, e.Y), _rKnob))
{
if (_isFocused == true && _isKnobRotating == true)
{
// Change value is allowed only only after 2nd click
this.Value = this.GetValueFromPosition(new Point(e.X, e.Y));
}
else
{
// 1st click = only focus
_isFocused = true;
_isKnobRotating = true;
}
}
this.Cursor = Cursors.Default;
}
protected override void OnMouseDown(MouseEventArgs e)
{
if (KryptonKnobUtilities.IsPointinRectangle(new Point(e.X, e.Y), _rKnob))
{
if (_isFocused)
{
// was already selected
// Start Rotation of knob only if it was selected before
_isKnobRotating = true;
}
else
{
// Was not selected before => select it
Focus();
_isFocused = true;
_isKnobRotating = false; // disallow rotation, must click again
// draw dotted border to show that it is selected
Invalidate();
}
}
}