internal void EndContinuousAdjustment()
{
//Don't forget to stop _tmrScrollDelay to prevent it from starting tmrNudge if the delay is not reached yet.
_tmrScrollDelay.Stop();
_tmrNudge.Stop();
_adjustementInProgress = PannableImageContinuousAdjustement.None;
}
private void DoContinuousAdjustment(PannableImageContinuousAdjustement adjustmentType)
{
switch (adjustmentType)
{
case PannableImageContinuousAdjustement.None:
return;
case PannableImageContinuousAdjustement.NudgeUp:
Nudge(y: -1);
break;
case PannableImageContinuousAdjustement.NudgeDown:
Nudge(y: 1);
break;
case PannableImageContinuousAdjustement.NudgeLeft:
Nudge(-1);
break;
case PannableImageContinuousAdjustement.NudgeRight:
Nudge(1);
break;
case PannableImageContinuousAdjustement.Enlarge:
EnlargeImage();
break;
case PannableImageContinuousAdjustement.Shrink:
ShrinkImage();
break;
default:
throw new ArgumentOutOfRangeException(nameof(adjustmentType), adjustmentType, null);
}
}
internal void BeginContinuousAdjustment(PannableImageContinuousAdjustement adjustmentType)
{
if (_adjustementInProgress != PannableImageContinuousAdjustement.None)
{
throw new InvalidOperationException("A continuous adjustement is already in progress.");
}
//First adjustement immediatly when the button is down, before the delay is considered.
//This also checks if the adjustement type is valid.
DoContinuousAdjustment(adjustmentType);
_adjustementInProgress = adjustmentType;
_tmrScrollDelay.Start();
}
protected override void OnKeyDown(KeyEventArgs e)
{
if (PannablePictureBoxImage.Image != null)
{
PannableImageContinuousAdjustement adjustment = PannableImageContinuousAdjustement.None;
switch (e.KeyData)
{
case Keys.Up:
adjustment = PannableImageContinuousAdjustement.NudgeUp;
break;
case Keys.Down:
adjustment = PannableImageContinuousAdjustement.NudgeDown;
break;
case Keys.Left:
adjustment = PannableImageContinuousAdjustement.NudgeLeft;
break;
case Keys.Right:
adjustment = PannableImageContinuousAdjustement.NudgeRight;
break;
case Keys.Add:
adjustment = PannableImageContinuousAdjustement.Enlarge;
break;
case Keys.Subtract:
adjustment = PannableImageContinuousAdjustement.Shrink;
break;
}
if (adjustment != PannableImageContinuousAdjustement.None)
{
DoContinuousAdjustment(adjustment);
}
}
base.OnKeyDown(e);
}