SelectAndMoveItem.cs
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using System;
using System.Linq;
using UnityEngine;
using UnityEngine.Timeline;
namespace UnityEditor.Timeline
{
class ClearSelection : Manipulator
{
protected override bool MouseDown(Event evt, WindowState state)
{
// If we hit this point this means no one used the mouse down events. We can safely clear the selection if needed
if (evt.button != 0)
return false;
var window = state.GetWindow();
if (!window.sequenceRect.Contains(evt.mousePosition))
return false;
if (ItemSelection.CanClearSelection(evt))
{
SelectionManager.Clear();
return true;
}
return false;
}
}
static class ItemSelection
{
public static bool CanClearSelection(Event evt)
{
return !evt.control && !evt.command && !evt.shift;
}
public static void RangeSelectItems(ITimelineItem lastItemToSelect)
{
var selectSorted = SelectionManager.SelectedItems().ToList();
var firstSelect = selectSorted.FirstOrDefault();
if (firstSelect == null)
{
SelectionManager.Add(lastItemToSelect);
return;
}
var allTracks = TimelineEditor.inspectedAsset.flattenedTracks;
var allItems = allTracks.SelectMany(ItemsUtils.GetItems).ToList();
TimelineHelpers.RangeSelect(allItems, selectSorted, lastItemToSelect, SelectionManager.Add, SelectionManager.Remove);
}
public static ISelectable HandleSingleSelection(Event evt)
{
var item = PickerUtils.PickedLayerableOfType<ISelectable>();
if (item != null)
{
var selected = item.IsSelected();
if (!selected && CanClearSelection(evt))
SelectionManager.Clear();
if (evt.modifiers == EventModifiers.Shift)
{
if (!selected)
RangeSelectItems((item as TimelineItemGUI).item);
}
else
{
HandleItemSelection(evt, item);
}
}
return item;
}
public static void HandleItemSelection(Event evt, ISelectable item)
{
if (evt.modifiers == ManipulatorsUtils.actionModifier)
{
if (item.IsSelected())
item.Deselect();
else
item.Select();
}
else
{
if (!item.IsSelected())
item.Select();
}
}
}
class SelectAndMoveItem : Manipulator
{
bool m_Dragged;
SnapEngine m_SnapEngine;
TimeAreaAutoPanner m_TimeAreaAutoPanner;
Vector2 m_MouseDownPosition;
bool m_HorizontalMovementDone;
bool m_VerticalMovementDone;
MoveItemHandler m_MoveItemHandler;
bool m_CycleMarkersPending;
protected override bool MouseDown(Event evt, WindowState state)
{
if (evt.alt || evt.button != 0)
return false;
m_Dragged = false;
// Cycling markers and selection are mutually exclusive operations
if (!HandleMarkerCycle() && !HandleSingleSelection(evt))
return false;
m_MouseDownPosition = evt.mousePosition;
m_VerticalMovementDone = false;
m_HorizontalMovementDone = false;
return true;
}
protected override bool MouseUp(Event evt, WindowState state)
{
if (!m_Dragged)
{
var item = PickerUtils.PickedLayerableOfType<ISelectable>();
if (item == null)
return false;
if (!item.IsSelected())
return false;
// Re-selecting an item part of a multi-selection should only keep this item selected.
if (SelectionManager.Count() > 1 && ItemSelection.CanClearSelection(evt))
{
SelectionManager.Clear();
item.Select();
return true;
}
if (m_CycleMarkersPending)
{
m_CycleMarkersPending = false;
TimelineMarkerClusterGUI.CycleMarkers();
return true;
}
return false;
}
m_TimeAreaAutoPanner = null;
DropItems();
m_SnapEngine = null;
m_MoveItemHandler = null;
state.Evaluate();
state.RemoveCaptured(this);
m_Dragged = false;
TimelineCursors.ClearCursor();
return true;
}
protected override bool DoubleClick(Event evt, WindowState state)
{
return MouseDown(evt, state) && MouseUp(evt, state);
}
protected override bool MouseDrag(Event evt, WindowState state)
{
if (state.editSequence.isReadOnly)
return false;
// case 1099285 - ctrl-click can cause no clips to be selected
var selectedItemsGUI = SelectionManager.SelectedItems();
if (!selectedItemsGUI.Any())
{
m_Dragged = false;
return false;
}
const float hDeadZone = 5.0f;
const float vDeadZone = 5.0f;
bool vDone = m_VerticalMovementDone || Math.Abs(evt.mousePosition.y - m_MouseDownPosition.y) > vDeadZone;
bool hDone = m_HorizontalMovementDone || Math.Abs(evt.mousePosition.x - m_MouseDownPosition.x) > hDeadZone;
m_CycleMarkersPending = false;
if (!m_Dragged)
{
var canStartMove = vDone || hDone;
if (canStartMove)
{
state.AddCaptured(this);
m_Dragged = true;
var referenceTrack = GetTrackDropTargetAt(state, m_MouseDownPosition);
foreach (var item in selectedItemsGUI)
item.gui.StartDrag();
m_MoveItemHandler = new MoveItemHandler(state);
m_MoveItemHandler.Grab(selectedItemsGUI, referenceTrack, m_MouseDownPosition);
m_SnapEngine = new SnapEngine(m_MoveItemHandler, m_MoveItemHandler, ManipulateEdges.Both,
state, m_MouseDownPosition);
m_TimeAreaAutoPanner = new TimeAreaAutoPanner(state);
}
}
if (!m_VerticalMovementDone)
{
m_VerticalMovementDone = vDone;
if (m_VerticalMovementDone)
m_MoveItemHandler.OnTrackDetach();
}
if (!m_HorizontalMovementDone)
{
m_HorizontalMovementDone = hDone;
}
if (m_Dragged)
{
if (m_HorizontalMovementDone)
m_SnapEngine.Snap(evt.mousePosition, evt.modifiers);
if (m_VerticalMovementDone)
{
var track = GetTrackDropTargetAt(state, evt.mousePosition);
m_MoveItemHandler.UpdateTrackTarget(track);
}
state.Evaluate();
}
return true;
}
public override void Overlay(Event evt, WindowState state)
{
if (!m_Dragged)
return;
if (m_TimeAreaAutoPanner != null)
m_TimeAreaAutoPanner.OnGUI(evt);
m_MoveItemHandler.OnGUI(evt);
if (!m_MoveItemHandler.allowTrackSwitch || m_MoveItemHandler.targetTrack != null)
{
TimeIndicator.Draw(state, m_MoveItemHandler.start, m_MoveItemHandler.end);
m_SnapEngine.OnGUI();
}
}
bool HandleMarkerCycle()
{
m_CycleMarkersPending = TimelineMarkerClusterGUI.CanCycleMarkers();
return m_CycleMarkersPending;
}
bool HandleSingleSelection(Event evt)
{
return ItemSelection.HandleSingleSelection(evt) != null;
}
void DropItems()
{
// Order matters here: m_MoveItemHandler.movingItems is destroyed during call to Drop()
foreach (var movingItem in m_MoveItemHandler.movingItems)
{
foreach (var item in movingItem.items)
item.gui.StopDrag();
}
m_MoveItemHandler.Drop();
}
static TrackAsset GetTrackDropTargetAt(WindowState state, Vector2 point)
{
var track = state.spacePartitioner.GetItemsAtPosition<IRowGUI>(point).FirstOrDefault();
return track != null ? track.asset : null;
}
}
}