protected override bool MouseDown(Event evt, WindowState state) { var handle = PickerUtils.PickedClipGUIHandle(); if (handle == null) { return(false); } if (handle.clipGUI.clip.parentTrack != null && handle.clipGUI.clip.parentTrack.lockedInHierarchy) { return(false); } if (ItemSelection.CanClearSelection(evt)) { SelectionManager.Clear(); } if (!SelectionManager.Contains(handle.clipGUI.clip)) { SelectionManager.Add(handle.clipGUI.clip); } m_TrimClipHandler = handle; m_IsCaptured = true; state.AddCaptured(this); m_UndoSaved = false; var clip = m_TrimClipHandler.clipGUI.clip; m_OriginalDuration = clip.duration; m_OriginalTimeScale = clip.timeScale; RefreshOverlayStrings(m_TrimClipHandler, state); // in ripple trim, the right edge moves and needs to snap var edges = ManipulateEdges.Right; if (EditMode.editType != EditMode.EditType.Ripple && m_TrimClipHandler.trimDirection == TrimEdge.Start) { edges = ManipulateEdges.Left; } m_SnapEngine = new SnapEngine(m_TrimClipHandler.clipGUI, new TrimClipAttractionHandler(), edges, state, evt.mousePosition); EditMode.BeginTrim(ItemsUtils.ToItem(clip), m_TrimClipHandler.trimDirection); return(true); }