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DropdownMenu.cs
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173 lines (146 loc) · 5.75 KB
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// Unity C# reference source
// Copyright (c) Unity Technologies. For terms of use, see
// https://unity3d.com/legal/licenses/Unity_Reference_Only_License
using System;
using System.Collections.Generic;
namespace UnityEngine.Experimental.UIElements
{
public class DropdownMenu
{
public class EventInfo
{
public EventModifiers modifiers { get; }
public Vector2 mousePosition { get; }
public Vector2 localMousePosition { get; }
char character { get; }
KeyCode keyCode { get; }
public EventInfo(EventBase e)
{
IMouseEvent mouseEvent = e as IMouseEvent;
if (mouseEvent != null)
{
mousePosition = mouseEvent.mousePosition;
localMousePosition = mouseEvent.localMousePosition;
modifiers = mouseEvent.modifiers;
character = '\0';
keyCode = KeyCode.None;
}
else
{
IKeyboardEvent keyboardEvent = e as IKeyboardEvent;
if (keyboardEvent != null)
{
character = keyboardEvent.character;
keyCode = keyboardEvent.keyCode;
modifiers = keyboardEvent.modifiers;
mousePosition = Vector2.zero;
localMousePosition = Vector2.zero;
}
}
}
}
public abstract class MenuItem {}
public class Separator : MenuItem
{
public string subMenuPath;
public Separator(string subMenuPath)
{
this.subMenuPath = subMenuPath;
}
}
public class MenuAction : MenuItem
{
[Flags]
public enum StatusFlags
{
Normal = 0, // Enabled, unchecked, shown
Disabled = 1,
Checked = 2,
Hidden = 4
}
public string name;
public StatusFlags status { get; private set; }
public EventInfo eventInfo { get; private set; }
public object userData { get; private set; }
Action<MenuAction> actionCallback;
Func<MenuAction, StatusFlags> actionStatusCallback;
// ActionStatusCallback for action that are always enabled.
public static StatusFlags AlwaysEnabled(MenuAction a) { return StatusFlags.Normal; }
// ActionStatusCallback for action that are always disabled.
public static StatusFlags AlwaysDisabled(MenuAction a) { return StatusFlags.Disabled; }
public MenuAction(string actionName, Action<MenuAction> actionCallback, Func<MenuAction, StatusFlags> actionStatusCallback, object userData = null)
{
name = actionName;
this.actionCallback = actionCallback;
this.actionStatusCallback = actionStatusCallback;
this.userData = userData;
}
public void UpdateActionStatus(EventInfo eventInfo)
{
this.eventInfo = eventInfo;
status = actionStatusCallback?.Invoke(this) ?? StatusFlags.Hidden;
}
public void Execute()
{
if (actionCallback != null)
{
actionCallback(this);
}
}
}
List<MenuItem> menuItems = new List<MenuItem>();
EventInfo m_EventInfo;
public List<MenuItem> MenuItems()
{
return menuItems;
}
public void AppendAction(string actionName, Action<MenuAction> action, Func<MenuAction, MenuAction.StatusFlags> actionStatusCallback, object userData = null)
{
MenuAction menuAction = new MenuAction(actionName, action, actionStatusCallback, userData);
menuItems.Add(menuAction);
}
public void InsertAction(int atIndex, string actionName, Action<MenuAction> action, Func<MenuAction, MenuAction.StatusFlags> actionStatusCallback, object userData = null)
{
MenuAction menuAction = new MenuAction(actionName, action, actionStatusCallback, userData);
menuItems.Insert(atIndex, menuAction);
}
public void AppendSeparator(string subMenuPath = null)
{
if (menuItems.Count > 0 && !(menuItems[menuItems.Count - 1] is Separator))
{
Separator separator = new Separator(subMenuPath == null ? String.Empty : subMenuPath);
menuItems.Add(separator);
}
}
public void InsertSeparator(string subMenuPath, int atIndex)
{
if (atIndex > 0 && atIndex <= menuItems.Count && !(menuItems[atIndex - 1] is Separator))
{
Separator separator = new Separator(subMenuPath == null ? String.Empty : subMenuPath);
menuItems.Insert(atIndex, separator);
}
}
public void RemoveItemAt(int index)
{
menuItems.RemoveAt(index);
}
public void PrepareForDisplay(EventBase e)
{
m_EventInfo = e != null ? new EventInfo(e) : null;
if (menuItems.Count == 0)
return;
foreach (MenuItem item in menuItems)
{
MenuAction action = item as MenuAction;
if (action != null)
{
action.UpdateActionStatus(m_EventInfo);
}
}
if (menuItems[menuItems.Count - 1] is Separator)
{
menuItems.RemoveAt(menuItems.Count - 1);
}
}
}
}