public static void DropdownSingle
(
Vector2 position,
SingleCallback callback,
IEnumerable <DropdownOption <T> > options,
DropdownOption <T> selectedOption,
DropdownOption <T> noneOption,
bool hasMultipleDifferentValues
)
{
bool hasOptions = options != null && options.Any();
GenericMenu menu = new GenericMenu();
GenericMenu.MenuFunction2 menuCallback = (o) => { GUI.changed = true; callback((T)o); };
if (noneOption != null)
{
bool on = !hasMultipleDifferentValues && (selectedOption == null || EqualityComparer <T> .Default.Equals(selectedOption.value, noneOption.value));
menu.AddItem(new GUIContent(noneOption.label), on, menuCallback, noneOption.value);
}
if (noneOption != null && hasOptions)
{
menu.AddSeparator("");
}
if (hasOptions)
{
foreach (var option in options)
{
bool on = !hasMultipleDifferentValues && (selectedOption != null && EqualityComparer <T> .Default.Equals(selectedOption.value, option.value));
menu.AddItem(new GUIContent(option.label), on, menuCallback, option.value);
}
}
menu.DropDown(new Rect(position, Vector2.zero));
}
/// <summary>
/// Render an editor popup and return the newly selected option.
/// </summary>
/// <param name="position">The position of the control.</param>
/// <param name="callback">The function called when a value is selected.</param>
/// <param name="options">The list of available options.</param>
/// <param name="selectedOption">The selected option, or null for none.</param>
/// <param name="noneOption">The option for "no selection", or null for none.</param>
/// <param name="hasMultipleDifferentValues">Whether the content has multiple different values.</param>
/// <param name="allowOuterOption">Whether a selected option not in range should be allowed.</param>
public static void PopupSingle
(
Rect position,
SingleCallback callback,
IEnumerable <DropdownOption <T> > options,
DropdownOption <T> selectedOption,
DropdownOption <T> noneOption,
bool hasMultipleDifferentValues,
bool allowOuterOption = true
)
{
string label;
if (hasMultipleDifferentValues)
{
label = "\u2014"; // Em Dash
}
else if (selectedOption == null)
{
if (noneOption != null)
{
label = noneOption.label;
}
else
{
label = string.Empty;
}
}
else
{
label = selectedOption.label;
}
if (GUI.Button(position, label, EditorStyles.popup))
{
DropdownSingle
(
new Vector2(position.xMin, position.yMax),
callback,
options,
selectedOption,
noneOption,
hasMultipleDifferentValues
);
}
else if (selectedOption != null && !options.Select(o => o.value).Contains(selectedOption.value) && !allowOuterOption)
{
// Selected option isn't in range
if (hasMultipleDifferentValues)
{
// Do nothing
}
else if (noneOption != null)
{
callback(noneOption.value);
}
else
{
callback(default(T));
}
}
}
