public bool SelectCurrentItem()
{
if (_currentMenuPage.ScrollPosition == 0 && _menuLevel.Count == 0 && _showBackOnRoot)
{
this.Disable();
Exited(this, new EventArgs());
return(true);
}
// if currently on a subpage and user selects back, pop back to parent page.
if (_currentMenuPage.ScrollPosition == 0 && _menuLevel.Count > 0)
{
MenuPage parent = _menuLevel.Pop() as MenuPage;
_currentMenuPage = parent;
RenderCurrentMenuPage();
return(true);
}
int pos = _currentMenuPage.ScrollPosition;
MenuItem child = ((MenuItem)_currentMenuPage.MenuItems[pos]);
// go to the submenu if children are present
if (child.SubMenu.MenuItems.Count > 0)
{
_menuLevel.Push(_currentMenuPage);
_currentMenuPage = child.SubMenu;
RenderCurrentMenuPage();
return(true);
}
// if there is a command, notify the subscribers
else if (child.Command != string.Empty)
{
Selected(this, new MenuSelectedEventArgs(child.Command));
return(true);
}
// if there is a type, then let the type handle the input
else if (child.Type != string.Empty)
{
// preserve current menu state and remove handlers
if (_encoder != null)
{
_encoder.Rotated -= HandlEncoderRotation;
}
else
{
_buttonPrevious.Clicked -= HandleButtonPrevious;
_buttonNext.Clicked -= HandleButtonNext;
}
_buttonSelect.Clicked -= HandleEncoderClick;
_menuLevel.Push(_currentMenuPage);
_isEditMode = true;
// create the new input type
var type = Type.GetType(INPUT_TYPES_NAMESPACE + child.Type);
if (type == null)
{
throw new ArgumentException(child.Type + " was not found");
}
var constructor = type.GetConstructor(new Type[] { });
IMenuInputItem inputItem = constructor.Invoke(new object[] { }) as IMenuInputItem;
// setup callback
inputItem.ValueChanged += delegate(object sender, ValueChangedEventArgs e)
{
// set the value and notify the eager listeners
child.Value = e.Value;
ValueChanged(this, new ValueChangedEventArgs(e.ItemID, e.Value));
// setup handlers again
if (_encoder != null)
{
_encoder.Rotated += HandlEncoderRotation;
}
else
{
_buttonPrevious.Clicked += HandleButtonPrevious;
_buttonNext.Clicked += HandleButtonNext;
}
_buttonSelect.Clicked += HandleEncoderClick;
// reload the parent menu
MenuPage parent = _menuLevel.Pop() as MenuPage;
_currentMenuPage = parent;
RenderCurrentMenuPage();
_isEditMode = false;
};
// initialize input mode and get new value
if (_encoder != null)
{
inputItem.Init(_display, _encoder, _buttonSelect);
}
else
{
inputItem.Init(_display, _buttonNext, _buttonPrevious, _buttonSelect);
}
inputItem.GetInput(child.ItemID, child.Value);
return(true);
}
else
{
return(false);
}
}
private void Init(ITextDisplay display, IRotaryEncoder encoder, IButton buttonNext, IButton buttonPrevious, IButton buttonSelect, MenuPage menuTree)
{
if (encoder != null)
{
_encoder = encoder;
}
else if (buttonNext != null && buttonPrevious != null)
{
_buttonPrevious = buttonPrevious;
_buttonNext = buttonNext;
}
else
{
throw new ArgumentNullException("Must have either a Rotary Encoder or Next/Previous buttons");
}
_display = display;
_buttonSelect = buttonSelect;
_rootMenuPage = menuTree;
_menuLevel = new Stack();
// Save our custom characters
_display.SaveCustomCharacter(TextCharacters.RightArrow.CharMap, TextCharacters.RightArrow.MemorySlot);
_display.SaveCustomCharacter(TextCharacters.RightArrowSelected.CharMap, TextCharacters.RightArrow.MemorySlot);
_display.SaveCustomCharacter(TextCharacters.BoxSelected.CharMap, TextCharacters.BoxSelected.MemorySlot);
}
public Menu(ITextDisplay display, RotaryEncoderWithButton encoder, MenuPage menuTree)
{
Init(display, encoder, menuTree);
}