/// <summary>
/// Adds a fold-out list GUI from a generic list of any serialized object type.
/// Uses System.Reflection to add all fields for a passed serialized object
/// instance. Handles most basic types including automatic naming like the
/// inspector does by default
///
/// Adds collapseBools (see docs below)
/// </summary>
/// <param name="label"> The field label</param>
/// <param name="list">A generic List</param>
/// <param name="expanded">A bool to determine the state of the primary fold-out</param>
/// <param name="foldOutStates">Dictionary<object, bool> used to track list item states</param>
/// <param name="collapseBools">
/// If true, bools on list items will collapse fields which follow them
/// </param>
/// <returns>The new foldout state from user input. Just like Unity's foldout</returns>
public static bool SerializedObjFoldOutList <T>(string label,
List <T> list,
bool expanded,
ref Dictionary <object, bool> foldOutStates,
bool collapseBools)
where T : new()
{
// Store the previous indent and return the flow to it at the end
int indent = EditorGUI.indentLevel;
EditorGUI.indentLevel = 0;
int buttonSpacer = 6;
#region Header Foldout
// Use a Horizanal space or the toolbar will extend to the left no matter what
EditorGUILayout.BeginHorizontal();
EditorGUI.indentLevel = 0; // Space will handle this for the header
GUILayout.Space(indent * 6); // Matches the content indent
EditorGUILayout.BeginHorizontal(EditorStyles.toolbar);
expanded = Foldout(expanded, label);
if (!expanded)
{
// Don't add the '+' button when the contents are collapsed. Just quit.
EditorGUILayout.EndHorizontal();
EditorGUILayout.EndHorizontal();
EditorGUI.indentLevel = indent; // Return to the last indent
return(expanded);
}
// BUTTONS...
EditorGUILayout.BeginHorizontal(GUILayout.MaxWidth(100));
// Add expand/collapse buttons if there are items in the list
bool masterCollapse = false;
bool masterExpand = false;
if (list.Count > 0)
{
GUIContent content;
var collapseIcon = '\u2261'.ToString();
content = new GUIContent(collapseIcon, "Click to collapse all");
masterCollapse = GUILayout.Button(content, EditorStyles.toolbarButton);
var expandIcon = '\u25A1'.ToString();
content = new GUIContent(expandIcon, "Click to expand all");
masterExpand = GUILayout.Button(content, EditorStyles.toolbarButton);
}
else
{
GUILayout.FlexibleSpace();
}
EditorGUILayout.BeginHorizontal(GUILayout.MaxWidth(50));
// A little space between button groups
GUILayout.Space(buttonSpacer);
// Main Add button
if (GUILayout.Button(new GUIContent("+", "Click to add"), EditorStyles.toolbarButton))
{
list.Add(new T());
}
EditorGUILayout.EndHorizontal();
EditorGUILayout.EndHorizontal();
EditorGUILayout.EndHorizontal();
EditorGUILayout.EndHorizontal();
#endregion Header Foldout
#region List Items
// Use a for, instead of foreach, to avoid the iterator since we will be
// be changing the loop in place when buttons are pressed. Even legal
// changes can throw an error when changes are detected
for (int i = 0; i < list.Count; i++)
{
T item = list[i];
#region Section Header
// If there is a field with the name 'name' use it for our label
string itemLabel = PGEditorUtils.GetSerializedObjFieldName <T>(item);
if (itemLabel == "")
{
itemLabel = string.Format("Element {0}", i);
}
// Get the foldout state.
// If this item is new, add it too (singleton)
// Singleton works better than multiple Add() calls because we can do
// it all at once, and in one place.
bool foldOutState;
if (!foldOutStates.TryGetValue(item, out foldOutState))
{
foldOutStates[item] = true;
foldOutState = true;
}
// Force states if master buttons were pressed
if (masterCollapse)
{
foldOutState = false;
}
if (masterExpand)
{
foldOutState = true;
}
// Use a Horizanal space or the toolbar will extend to the start no matter what
EditorGUILayout.BeginHorizontal();
EditorGUI.indentLevel = 0; // Space will handle this for the header
GUILayout.Space((indent + 3) * 6); // Matches the content indent
EditorGUILayout.BeginHorizontal(EditorStyles.toolbar);
// Display foldout with current state
foldOutState = Foldout(foldOutState, itemLabel);
foldOutStates[item] = foldOutState; // Used again below
LIST_BUTTONS listButtonPressed = AddFoldOutListItemButtons();
EditorGUILayout.EndHorizontal();
EditorGUILayout.EndHorizontal();
#endregion Section Header
// If folded out, display all serialized fields
if (foldOutState == true)
{
EditorGUI.indentLevel = indent + 3;
// Display Fields for the list instance
PGEditorUtils.SerializedObjectFields <T>(item, collapseBools);
GUILayout.Space(2);
}
#region Process List Changes
// Don't allow 'up' presses for the first list item
switch (listButtonPressed)
{
case LIST_BUTTONS.None: // Nothing was pressed, do nothing
break;
case LIST_BUTTONS.Up:
if (i > 0)
{
T shiftItem = list[i];
list.RemoveAt(i);
list.Insert(i - 1, shiftItem);
}
break;
case LIST_BUTTONS.Down:
// Don't allow 'down' presses for the last list item
if (i + 1 < list.Count)
{
T shiftItem = list[i];
list.RemoveAt(i);
list.Insert(i + 1, shiftItem);
}
break;
case LIST_BUTTONS.Remove:
list.RemoveAt(i);
foldOutStates.Remove(item); // Clean-up
break;
case LIST_BUTTONS.Add:
list.Insert(i, new T());
break;
}
#endregion Process List Changes
}
#endregion List Items
EditorGUI.indentLevel = indent;
return(expanded);
}