/// <summary>
/// Event handler for the TimelineControl.MouseDownPicked event</summary>
/// <param name="sender">The TimelineControl that we are attached to</param>
/// <param name="e">HitEventArgs</param>
protected virtual void Owner_MouseDownPicked(object sender, HitEventArgs e)
{
HitRecord hitRecord = e.HitRecord;
TimelinePath hitObject = hitRecord.HitPath;
if (hitObject != null)
{
Keys modifiers = Control.ModifierKeys;
if (e.MouseEvent.Button == MouseButtons.Left)
{
if (modifiers == Keys.None && SelectionContext != null &&
SelectionContext.SelectionContains(hitObject))
{
// The hit object is already selected. Wait until the mouse up to see if there was
// a drag or not. If no drag, then set the selection set to be this one object.
m_mouseDownHitRecord = hitRecord;
m_mouseDownPos = e.MouseEvent.Location;
}
else if (modifiers == Keys.Control)
{
// Either this object is not already selected or Shift key is being held down.
// to be consistent with the Windows interface.
m_mouseDownHitRecord = hitRecord;
m_mouseDownPos = e.MouseEvent.Location;
}
else if ((modifiers & Keys.Alt) == 0)
{
// The 'Alt' key might mean something different. If no Alt key, we can update the
// selection immediately.
UpdateSelection(hitRecord, modifiers);
}
}
else if (e.MouseEvent.Button == MouseButtons.Right)
{
if (modifiers == Keys.None && SelectionContext != null &&
!SelectionContext.SelectionContains(hitObject))
{
// The hit object is not already selected and a right-click landed on it. Select it.
UpdateSelection(hitRecord, modifiers);
}
}
}
}
/// <summary>
/// Updates the selection set, given the hit object and the modifier keys</summary>
/// <param name="hitRecord">HitRecord</param>
/// <param name="modifiers">Modifier keys</param>
private void UpdateSelection(HitRecord hitRecord, Keys modifiers)
{
TimelinePath hitObject = hitRecord.HitPath;
bool hitIsValidAnchor = true;
switch (hitRecord.Type)
{
case HitType.GroupMove:
SelectGroups(hitObject);
break;
case HitType.TrackMove:
SelectTracks(hitObject);
break;
case HitType.Interval:
case HitType.Key:
case HitType.Marker:
SelectEvents(hitObject);
Owner.Constrain = (modifiers & Owner.ConstrainModifierKeys) != 0;
break;
default:
Anchor = null;
hitIsValidAnchor = false;
break;
}
if (hitIsValidAnchor)
{
// If the Shift key is not held down or the current Anchor is null, or the user
// has switched between track and group, or the user has picked an event, then
// update the Anchor. IEvents are always additive with the shift key.
if ((modifiers & Keys.Shift) == 0 ||
Anchor == null ||
(Anchor.Last is IGroup && hitObject.Last is ITrack) ||
(Anchor.Last is ITrack && hitObject.Last is IGroup) ||
(Anchor.Last is IEvent && hitObject.Last is IEvent))
{
Anchor = hitObject;
}
}
}
private void owner_MouseMovePicked(object sender, HitEventArgs e)
{
if (e.MouseEvent.Button == MouseButtons.None &&
!m_owner.IsUsingMouse)
{
HitRecord hitRecord = e.HitRecord;
if (m_owner.IsEditable(hitRecord.HitPath))
{
switch (hitRecord.Type)
{
case HitType.Interval:
case HitType.Key:
case HitType.Marker:
m_owner.Cursor = Cursors.SizeAll;
break;
default:
break;
}
}
}
}
/// <summary>
/// Constructs a hit event argument</summary>
/// <param name="hitRecord">Hit record. Can be null if raising a Picking event.</param>
/// <param name="pickRectangle">Picking rectangle in Windows client coordinates</param>
/// <param name="mouseEvent">The mouse event, if any, associated with this pick action</param>
public HitEventArgs(HitRecord hitRecord, RectangleF pickRectangle, MouseEventArgs mouseEvent)
{
m_hitRecord = hitRecord;
PickRectangle = pickRectangle;
MouseEvent = mouseEvent;
}
/// <summary>
/// Comparer for sorting HitRecords by their HitType enum. Lower-valued enums come first.</summary>
private int CompareHits(HitRecord x, HitRecord y)
{
return x.Type.CompareTo(y.Type);
}
/// <summary>
/// Constructs a hit event argument</summary>
/// <param name="hitRecord">Hit record. Can be null if raising a Picking event.</param>
/// <param name="pickRectangle">Picking rectangle in Windows client coordinates</param>
/// <param name="mouseEvent">The mouse event, if any, associated with this pick action</param>
public HitEventArgs(HitRecord hitRecord, RectangleF pickRectangle, MouseEventArgs mouseEvent)
{
m_hitRecord = hitRecord;
PickRectangle = pickRectangle;
MouseEvent = mouseEvent;
}
/// <summary>
/// Updates the selection set, given the hit object and the modifier keys</summary>
/// <param name="hitRecord">HitRecord</param>
/// <param name="modifiers">Modifier keys</param>
private void UpdateSelection(HitRecord hitRecord, Keys modifiers)
{
TimelinePath hitObject = hitRecord.HitPath;
bool hitIsValidAnchor = true;
switch (hitRecord.Type)
{
case HitType.GroupMove:
SelectGroups(hitObject);
break;
case HitType.TrackMove:
SelectTracks(hitObject);
break;
case HitType.Interval:
case HitType.Key:
case HitType.Marker:
SelectEvents(hitObject);
Owner.Constrain = (modifiers & Owner.ConstrainModifierKeys) != 0;
break;
default:
Anchor = null;
hitIsValidAnchor = false;
break;
}
if (hitIsValidAnchor)
{
// If the Shift key is not held down or the current Anchor is null, or the user
// has switched between track and group, or the user has picked an event, then
// update the Anchor. IEvents are always additive with the shift key.
if ((modifiers & Keys.Shift) == 0 ||
Anchor == null ||
(Anchor.Last is IGroup && hitObject.Last is ITrack) ||
(Anchor.Last is ITrack && hitObject.Last is IGroup) ||
(Anchor.Last is IEvent && hitObject.Last is IEvent))
{
Anchor = hitObject;
}
}
}