/// <summary>
/// Displays a single-option popup.
/// </summary>
public static T PopupSingle
(
Rect position,
IEnumerable <DropdownOption <T> > options,
T selectedValue,
DropdownOption <T> noneOption,
GUIContent label = null,
GUIStyle style = null
)
{
var selectedOption = options.FirstOrDefault(o => Equal(o.value, selectedValue));
if (selectedOption == null)
{
selectedOption = new DropdownOption <T>(selectedValue);
}
return(PopupSingle
(
position,
options,
selectedOption,
noneOption,
label,
style
));
}
/// <summary>
/// Displays a single-option dropdown.
/// </summary>
public static void DropdownSingle
(
Vector2 position,
SingleCallback callback,
IEnumerable <DropdownOption <T> > options,
DropdownOption <T> selectedOption,
DropdownOption <T> noneOption
)
{
var hasMultipleDifferentValues = EditorGUI.showMixedValue;
ICollection <DropdownOption <T> > optionsCache = null;
bool hasOptions;
if (options != null)
{
optionsCache = options.CacheToCollection();
hasOptions = optionsCache.Count > 0;
}
else
{
hasOptions = false;
}
GenericMenu menu = new GenericMenu();
GenericMenu.MenuFunction2 menuCallback = (o) =>
{
callback((T)o);
};
if (noneOption != null)
{
bool on = !hasMultipleDifferentValues && (selectedOption == null || Equal(selectedOption.value, noneOption.value));
menu.AddItem(new GUIContent(noneOption.label), on, menuCallback, noneOption.value);
}
if (noneOption != null && hasOptions)
{
menu.AddSeparator(string.Empty);
}
if (hasOptions)
{
foreach (var option in optionsCache)
{
bool on = !hasMultipleDifferentValues && (selectedOption != null && Equal(selectedOption.value, option.value));
menu.AddItem(new GUIContent(option.label), on, menuCallback, option.value);
}
}
menu.DropDown(new Rect(position, Vector2.zero));
}
/// <summary>
/// Displays a single-option popup with a custom selected option label.
/// </summary>
public static T PopupSingle
(
Rect position,
IEnumerable <DropdownOption <T> > options,
DropdownOption <T> selectedOption,
DropdownOption <T> noneOption,
GUIContent label = null,
GUIStyle style = null
)
{
return(PopupSingle
(
position,
() => options,
selectedOption,
noneOption,
label,
style
));
}
/// <summary>
/// Displays a single-option popup where the option list is only built when the dropdown is shown.
/// Useful when building the options list is very demanding (e.g. reflection).
/// </summary>
public static T PopupSingle
(
Rect position,
GetOptionsCallback getOptions,
T selectedValue,
DropdownOption <T> noneOption,
GUIContent label = null,
GUIStyle style = null
)
{
var selectedOption = new DropdownOption <T>(selectedValue);
return(PopupSingle
(
position,
getOptions,
selectedOption,
noneOption,
label,
style
));
}
/// <summary>
/// Displays a single-option popup where the option list is only built when the dropdown is shown.
/// Useful when building the options list is very demanding (e.g. reflection).
/// </summary>
public static T PopupSingle
(
Rect position,
GetOptionsCallback getOptions,
DropdownOption <T> selectedOption,
DropdownOption <T> noneOption,
GUIContent label = null,
GUIStyle style = null
)
{
var hasMultipleDifferentValues = EditorGUI.showMixedValue;
// Determine the label text if no override is specified
if (label == null)
{
string text;
if (hasMultipleDifferentValues)
{
text = "\u2014"; // Em Dash
}
else if (selectedOption == null)
{
if (noneOption != null)
{
text = noneOption.label;
}
else
{
text = string.Empty;
}
}
else
{
text = selectedOption.label;
}
label = new GUIContent(text);
}
// Apply the popup style is no override is specified
if (style == null)
{
style = EditorStyles.popup;
}
// Render a button and get its control ID
var popupClicked = GUI.Button(position, label, style);
var popupControlID = GetLastControlID();
if (popupClicked)
{
// Cancel button click
GUI.changed = false;
// Assign the active control ID
activePopupControlID = popupControlID;
// Display the dropdown
DropdownSingle
(
new Vector2(position.xMin, position.yMax),
(value) =>
{
activeSingleDropdownValue = value;
activeDropdownChanged = true;
},
getOptions(),
selectedOption,
noneOption
);
}
if (popupControlID == activePopupControlID && activeDropdownChanged)
{ // Selected option changed
// TODO: Use EditorWindow.SendEvent like EditorGUI.PopupCallbackInfo does.
// Otherwise, there seems to be a 1-frame delay in update.
GUI.changed = true;
activePopupControlID = -1;
activeDropdownChanged = false;
return(activeSingleDropdownValue);
}
else if (selectedOption == null)
{ // Selected option is null
if (noneOption != null)
{
return(noneOption.value);
}
else
{
return(default(T));
}
}
else
{
return(selectedOption.value);
}
}