public void RegisterToggle(Toggle2 toggle)
{
if (!m_Toggles.Contains(toggle))
{
m_Toggles.Add(toggle);
}
}
// Change the value and hide the dropdown.
private void OnSelectItem(Toggle2 toggle)
{
if (!toggle.isOn)
{
toggle.isOn = true;
}
int selectedIndex = -1;
Transform tr = toggle.transform;
Transform parent = tr.parent;
for (int i = 0; i < parent.childCount; i++)
{
if (parent.GetChild(i) == tr)
{
// Subtract one to account for template child.
selectedIndex = i - 1;
break;
}
}
if (selectedIndex < 0)
{
return;
}
value = selectedIndex;
Hide();
}
public void UnregisterToggle(Toggle2 toggle)
{
if (m_Toggles.Contains(toggle))
{
m_Toggles.Remove(toggle);
}
}
private void ValidateToggleIsInGroup(Toggle2 toggle)
{
if (toggle == null || !m_Toggles.Contains(toggle))
{
throw new ArgumentException(string.Format("Toggle2 {0} is not part of ToggleGroup2 {1}", new object[] { toggle, this }));
}
}
public void NotifyToggleOn(Toggle2 toggle)
{
ValidateToggleIsInGroup(toggle);
// disable all toggles in the group
for (var i = 0; i < m_Toggles.Count; i++)
{
if (m_Toggles[i] == toggle)
{
continue;
}
m_Toggles[i].isOn = false;
}
}
// Show the dropdown.
//
// Plan for dropdown scrolling to ensure dropdown is contained within screen.
//
// We assume the Canvas is the screen that the dropdown must be kept inside.
// This is always valid for screen space canvas modes.
// For world space canvases we don't know how it's used, but it could be e.g. for an in-game monitor.
// We consider it a fair constraint that the canvas must be big enough to contains dropdowns.
public void Show()
{
if (!IsActive() || !IsInteractable() || m_Dropdown != null)
{
return;
}
if (!validTemplate)
{
SetupTemplate();
if (!validTemplate)
{
return;
}
}
// Get root Canvas.
var list = ListPool2 <Canvas> .Get();
gameObject.GetComponentsInParent(false, list);
if (list.Count == 0)
{
return;
}
Canvas rootCanvas = list[0];
ListPool2 <Canvas> .Release(list);
m_Template.gameObject.SetActive(true);
// Instantiate the drop-down template
m_Dropdown = CreateDropdownList(m_Template.gameObject);
m_Dropdown.name = "Dropdown List";
m_Dropdown.SetActive(true);
// Make drop-down RectTransform have same values as original.
RectTransform dropdownRectTransform = m_Dropdown.transform as RectTransform;
dropdownRectTransform.SetParent(m_Template.transform.parent, false);
// Instantiate the drop-down list items
// Find the dropdown item and disable it.
DropdownItem itemTemplate = m_Dropdown.GetComponentInChildren <DropdownItem>();
GameObject content = itemTemplate.rectTransform.parent.gameObject;
RectTransform contentRectTransform = content.transform as RectTransform;
itemTemplate.rectTransform.gameObject.SetActive(true);
// Get the rects of the dropdown and item
Rect dropdownContentRect = contentRectTransform.rect;
Rect itemTemplateRect = itemTemplate.rectTransform.rect;
// Calculate the visual offset between the item's edges and the background's edges
Vector2 offsetMin = itemTemplateRect.min - dropdownContentRect.min + (Vector2)itemTemplate.rectTransform.localPosition;
Vector2 offsetMax = itemTemplateRect.max - dropdownContentRect.max + (Vector2)itemTemplate.rectTransform.localPosition;
Vector2 itemSize = itemTemplateRect.size;
m_Items.Clear();
Toggle2 prev = null;
for (int i = 0; i < options.Count; ++i)
{
Dropdown.OptionData data = options[i];
DropdownItem item = AddItem(data, value == i, itemTemplate, m_Items);
if (item == null)
{
continue;
}
// Automatically set up a toggle state change listener
item.toggle.isOn = value == i;
item.toggle.onValueChanged.AddListener(x => OnSelectItem(item.toggle));
// Select current option
if (item.toggle.isOn)
{
item.toggle.Select();
}
// Automatically set up explicit navigation
if (prev != null)
{
Navigation prevNav = prev.navigation;
Navigation toggleNav = item.toggle.navigation;
prevNav.mode = Navigation.Mode.Explicit;
toggleNav.mode = Navigation.Mode.Explicit;
prevNav.selectOnDown = item.toggle;
prevNav.selectOnRight = item.toggle;
toggleNav.selectOnLeft = prev;
toggleNav.selectOnUp = prev;
prev.navigation = prevNav;
item.toggle.navigation = toggleNav;
}
prev = item.toggle;
}
// Reposition all items now that all of them have been added
Vector2 sizeDelta = contentRectTransform.sizeDelta;
sizeDelta.y = itemSize.y * m_Items.Count + offsetMin.y - offsetMax.y;
contentRectTransform.sizeDelta = sizeDelta;
float extraSpace = dropdownRectTransform.rect.height - contentRectTransform.rect.height;
if (extraSpace > 0)
{
dropdownRectTransform.sizeDelta = new Vector2(dropdownRectTransform.sizeDelta.x, dropdownRectTransform.sizeDelta.y - extraSpace);
}
// Invert anchoring and position if dropdown is partially or fully outside of canvas rect.
// Typically this will have the effect of placing the dropdown above the button instead of below,
// but it works as inversion regardless of initial setup.
Vector3[] corners = new Vector3[4];
dropdownRectTransform.GetWorldCorners(corners);
RectTransform rootCanvasRectTransform = rootCanvas.transform as RectTransform;
Rect rootCanvasRect = rootCanvasRectTransform.rect;
for (int axis = 0; axis < 2; axis++)
{
bool outside = false;
for (int i = 0; i < 4; i++)
{
Vector3 corner = rootCanvasRectTransform.InverseTransformPoint(corners[i]);
if (corner[axis] < rootCanvasRect.min[axis] || corner[axis] > rootCanvasRect.max[axis])
{
outside = true;
break;
}
}
if (outside)
{
RectTransformUtility.FlipLayoutOnAxis(dropdownRectTransform, axis, false, false);
}
}
for (int i = 0; i < m_Items.Count; i++)
{
RectTransform itemRect = m_Items[i].rectTransform;
itemRect.anchorMin = new Vector2(itemRect.anchorMin.x, 0);
itemRect.anchorMax = new Vector2(itemRect.anchorMax.x, 0);
itemRect.anchoredPosition = new Vector2(itemRect.anchoredPosition.x, offsetMin.y + itemSize.y * (m_Items.Count - 1 - i) + itemSize.y * itemRect.pivot.y);
itemRect.sizeDelta = new Vector2(itemRect.sizeDelta.x, itemSize.y);
}
// Fade in the popup
AlphaFadeList(0.15f, 0f, 1f);
// Make drop-down template and item template inactive
m_Template.gameObject.SetActive(false);
itemTemplate.gameObject.SetActive(false);
m_Blocker = CreateBlocker(rootCanvas);
}
private void SetupTemplate()
{
validTemplate = false;
if (!m_Template)
{
Debug.LogError("The dropdown template is not assigned. The template needs to be assigned and must have a child GameObject with a Toggle component serving as the item.", this);
return;
}
GameObject templateGo = m_Template.gameObject;
templateGo.SetActive(true);
Toggle2 itemToggle = m_Template.GetComponentInChildren <Toggle2>();
validTemplate = true;
if (!itemToggle || itemToggle.transform == template)
{
validTemplate = false;
Debug.LogError("The dropdown template is not valid. The template must have a child GameObject with a Toggle component serving as the item.", template);
}
else if (!(itemToggle.transform.parent is RectTransform))
{
validTemplate = false;
Debug.LogError("The dropdown template is not valid. The child GameObject with a Toggle component (the item) must have a RectTransform on its parent.", template);
}
else if (itemText != null && !itemText.transform.IsChildOf(itemToggle.transform))
{
validTemplate = false;
Debug.LogError("The dropdown template is not valid. The Item Text must be on the item GameObject or children of it.", template);
}
else if (itemImage != null && !itemImage.transform.IsChildOf(itemToggle.transform))
{
validTemplate = false;
Debug.LogError("The dropdown template is not valid. The Item Image must be on the item GameObject or children of it.", template);
}
if (!validTemplate)
{
templateGo.SetActive(false);
return;
}
DropdownItem item = itemToggle.gameObject.AddComponent <DropdownItem>();
item.text = m_ItemText;
item.image = m_ItemImage;
item.toggle = itemToggle;
item.rectTransform = (RectTransform)itemToggle.transform;
Canvas popupCanvas = GetOrAddComponent <Canvas>(templateGo);
popupCanvas.overrideSorting = true;
popupCanvas.sortingOrder = 30000;
GetOrAddComponent <GraphicRaycaster>(templateGo);
GetOrAddComponent <CanvasGroup>(templateGo);
templateGo.SetActive(false);
validTemplate = true;
}