static void setup()
{
if (arrowTexture_ == null)
{
arrowTexture_ = Resources.Load <Texture2D>("arrow");
}
if (skin_ == null)
{
skin_ = Resources.Load <GUISkin>("Dropdown");
}
if (defaultDropdownStyles_ == null)
{
defaultDropdownStyles_ = new DropdownStyles(skin_.button, skin_.FindStyle("dropdown_option"));
}
}
static bool drawCaption(Rect position, string[] options, DropdownState state, DropdownStyles styles)
{
if (0 <= state.Select && state.Select < options.Length)
{
state.Caption = options[state.Select];
}
// Caption
bool pushed = GUI.Button(position, state.Caption, styles.Caption);
// Arrow
var arrowPosition = new Rect(
position.xMax - styles.ArrowMargin - styles.ArrowSize,
position.center.y - styles.ArrowSize / 2,
styles.ArrowSize, styles.ArrowSize);
var prevColor = GUI.color;
GUI.color = styles.ArrowColor;
GUI.DrawTexture(arrowPosition, arrowTexture_);
GUI.color = prevColor;
return(pushed);
}
static int drawDropdownList(Rect position, string[] options, DropdownState state, DropdownStyles styles)
{
int newSelect = -1;
float offsetY = position.yMax;
float totalOptionHeight = position.height * options.Length;
if (offsetY + totalOptionHeight > Screen.height)
{
offsetY = position.yMin - totalOptionHeight;
}
for (int i = 0; i < options.Length; i++)
{
var optionPosition = position;
optionPosition.y = offsetY + position.height * i;
string text = string.Format("{0}{1}", i == state.Select ? " ✓ " : " ", options[i]);
if (GUI.Button(optionPosition, text, styles.Option))
{
newSelect = i;
}
}
return(newSelect);
}
static DropdownState closingDropdown(Rect position, string[] options, DropdownState state, DropdownStyles styles)
{
const float fadeTime = 0.1f;
float dt = Time.time - state.currentStatusStartTime;
drawCaption(position, options, state, styles);
var prevColor = GUI.color;
GUI.color = new Color(1, 1, 1, 1 - dt / fadeTime);
drawDropdownList(position, options, state, styles);
GUI.color = prevColor;
if (dt >= fadeTime)
{
state.Select = state.nextSelect;
state.currentStatus = DropdownState.status.Closed;
}
return(state);
}
static DropdownState openedDropdown(Rect position, string[] options, DropdownState state, DropdownStyles styles)
{
if (drawCaption(position, options, state, styles))
{
state.currentStatus = DropdownState.status.Closing;
}
int newSelect = drawDropdownList(position, options, state, styles);
if (newSelect >= 0)
{
state.nextSelect = newSelect;
state.currentStatus = DropdownState.status.Closing;
}
return(state);
}
static DropdownState closedDropdown(Rect position, string[] options, DropdownState state, DropdownStyles styles)
{
if (drawCaption(position, options, state, styles))
{
state.currentStatus = DropdownState.status.Opening;
}
return(state);
}
public static DropdownState Dropdown(Rect position, string[] options, DropdownState state, DropdownStyles styles = null)
{
setup();
if (styles == null)
{
styles = defaultDropdownStyles_;
}
switch (state.currentStatus)
{
case DropdownState.status.Closed:
return(closedDropdown(position, options, state, styles));
case DropdownState.status.Opening:
return(openingDropdown(position, options, state, styles));
case DropdownState.status.Opened:
return(openedDropdown(position, options, state, styles));
case DropdownState.status.Closing:
return(closingDropdown(position, options, state, styles));
}
return(state);
}
