/// <summary>
/// Widget constructor
/// </summary>
protected virtual void Construct()
{
// set some default value
m_selectedItem = default(T);
m_clickAnywhereToOpen = false;
// get allocators and UI elements
m_allocator = this.GetWidgetAllocator();
m_listAllocator = this.GetListWidgetAllocator();
m_listArea = this.GetListArea();
m_selectedItemArea = this.GetSelectedItemArea();
m_pushButton = this.GetPushButton();
// create the list and subscribe to the item selection event
m_list = m_listAllocator.Construct();
m_list.OnSelectItem.AddListener(this.OnItemSelected);
// reparent the list to the list area transform provided by the inheriting class
RectTransform listTransform = (RectTransform)m_list.transform;
listTransform.SetParent(m_listArea, false);
listTransform.Stretch();
// list should be disabled by default
m_listArea.gameObject.SetActive(false);
// subscribe to the PushButton's click event
this.EnablePushButtonListener(true);
}
protected void CreateWidgetAt(int p_index)
{
WidgetType widget = m_allocator.Construct();
RectTransform widgetTransform = widget.transform as RectTransform;
widgetTransform.SetParent(m_contentArea, false);
this.UpdateWidgetPosition(p_index, widgetTransform);
Button button = widget.GetComponent <Button>();
if (button != null)
{
button.onClick.AddListener(() => { this.OnWidgetClicked(m_items[p_index]); });
}
m_widgets[p_index] = widget;
widget.Enable(m_items[p_index]);
}
/// <summary>
/// Sets the selected item and manages the visibility of the widget
/// </summary>
/// <param name="p_item"></param>
protected virtual void SetSelectedItem(T p_item)
{
m_selectedItem = p_item;
// If the item is set to null, make sure the widget is destroyed.
//
// NOTE: not checking against default(T) here because this would
// cause strange behaviour when the type T is a value type (like int).
// When calling this method with the parameter zero, the widget would be
// destroyed.
if (m_selectedItem == null)
{
if (m_selectedWidget != null)
{
m_allocator.Destroy(m_selectedWidget);
m_selectedWidget = null;
}
}
else
{
// create a widget if there is none
if (m_selectedWidget == null)
{
m_selectedWidget = m_allocator.Construct();
RectTransform widgetTransform = (RectTransform)m_selectedWidget.transform;
widgetTransform.SetParent(m_selectedItemArea, false);
widgetTransform.Stretch();
}
// ... otherwise disable it. This allows the widget to clean up before passing a new value.
else
{
m_selectedWidget.Disable();
}
// assign the value to the widget
m_selectedWidget.Enable(m_selectedItem);
}
}