/// <summary>Handle a click at the given position, if applicable.</summary>
/// <param name="x">The X-position that was clicked.</param>
/// <param name="y">The Y-position that was clicked.</param>
/// <param name="itemClicked">Whether a dropdown item was clicked.</param>
/// <returns>Returns whether the click was handled.</returns>
public bool TryClick(int x, int y, out bool itemClicked)
{
// dropdown value
var option = this.Options.FirstOrDefault(p => p.visible && p.containsPoint(x, y));
if (option != null)
{
this.SelectedOption = option;
itemClicked = true;
return(true);
}
itemClicked = false;
// arrows
if (this.UpArrow.containsPoint(x, y))
{
this.Scroll(-1);
return(true);
}
if (this.DownArrow.containsPoint(x, y))
{
this.Scroll(1);
return(true);
}
return(false);
}
public bool TryClick(int x, int y, out bool itemClicked)
{
var option = _options.FirstOrDefault(p => p.visible && p.containsPoint(x, y));
if (option != null)
{
_selectedOption = option;
itemClicked = true;
return(true);
}
itemClicked = false;
if (_upArrow.containsPoint(x, y))
{
Scroll(-1);
return(true);
}
if (_downArrow.containsPoint(x, y))
{
Scroll(1);
return(true);
}
return(false);
}
/// <summary>Select an item in the list matching the given value.</summary>
/// <param name="value">The value to search.</param>
/// <returns>Returns whether an item was selected.</returns>
public bool TrySelect(TValue value)
{
var entry = this.Options.FirstOrDefault(p =>
(p.Value == null && value == null) ||
p.Value?.Equals(value) == true
);
if (entry == null)
{
return(false);
}
this.SelectedOption = entry;
return(true);
}
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="selectedValue">The selected value.</param>
/// <param name="items">The items in the list.</param>
/// <param name="getLabel">Get the display label for an item.</param>
/// <param name="x">The X-position from which to render the list.</param>
/// <param name="y">The Y-position from which to render the list.</param>
/// <param name="font">The font with which to render text.</param>
public DropdownList(TValue selectedValue, TValue[] items, Func <TValue, string> getLabel, int x, int y, SpriteFont font)
: base(new Rectangle(), nameof(DropdownList <TValue>))
{
// save values
this.Options = items
.Select((item, index) => new DropListOption(Rectangle.Empty, index, getLabel(item), item, font))
.ToArray();
this.Font = font;
this.MaxLabelHeight = this.Options.Max(p => p.LabelHeight);
// set initial selection
int selectedIndex = Array.IndexOf(items, selectedValue);
this.SelectedOption = selectedIndex >= 0
? this.Options[selectedIndex]
: this.Options.First();
// initialize UI
this.bounds.X = x;
this.bounds.Y = y;
this.ReinitializeComponents();
}
public DropdownList(TValue selectedValue, TValue[] items, Func <TValue, string> getLabel, int x, int y,
SpriteFont font)
: base(new Rectangle(), nameof(DropdownList <TValue>))
{
_options = items
.Select((i, index) => new DropListOption(Rectangle.Empty, index, getLabel(i), i, font))
.ToArray();
_font = font;
_labelWidth = RenderHelpers.GetLabelWidth(_font);
MaxLabelHeight = _options.Max(p => p.LabelHeight);
var selectedIndex = Array.IndexOf(items, selectedValue);
_selectedOption = selectedIndex >= 0 ? _options[selectedIndex] : _options.First();
bounds.X = x;
bounds.Y = y;
ReinitializeComponents();
}
