/// <summary>
/// Construct a new slider
/// </summary>
/// <param name="x">The horizontal offset of the slider [0 ; 1]</param>
/// <param name="y">The vertical offset of the slider [0 ; 1]</param>
/// <param name="w">The width of the slider [0 ; 1]</param>
/// <param name="h">The height of the slider [0 ; 1]</param>
/// <param name="text">The label of the slider</param>
/// <param name="minValue">The minimal slider value</param>
/// <param name="maxValue">The maximum slider value</param>
/// <param name="startValue">The initial slider value</param>
public Slider(double x, double y, double w, double h,
double minValue, double maxValue, double startValue)
{
this.x = x;
this.y = y;
this.w = w;
this.h = h;
this.minValue = minValue;
this.maxValue = maxValue;
this.sliderValue = startValue;
State = SliderStates.Mouseable;
}
/// <summary>
/// Update the slider
/// </summary>
/// <param name="panelRect">The rectangle the slider resides in</param>
public override void Update(Rect panelRect)
{
int mouseX = Globals.mouseX;
int mouseY = Globals.mouseY;
var events = Globals.eventQueue;
double _mouseX = (mouseX - panelRect.X) / (double)panelRect.W;
double _mouseY = (mouseY - panelRect.Y) / (double)panelRect.H;
bool hovering = false;
bool mouseUp = (events.Any(e =>
e.type == SDL.SDL_EventType.SDL_MOUSEBUTTONUP));
bool mouseDown = (events.Any(e =>
e.type == SDL.SDL_EventType.SDL_MOUSEBUTTONDOWN));
if (_mouseX > x - h / 2 && _mouseX < x + h / 2 + w &&
_mouseY > y && _mouseY < y + h)
{
hovering = true;
}
if (!hovering && State != SliderStates.Pressed)
{
State = SliderStates.Mouseable;
}
if (State == SliderStates.Mouseable && hovering)
{
State = SliderStates.Moused;
}
if (State == SliderStates.Moused && mouseDown)
{
State = SliderStates.Pressed;
}
if (State == SliderStates.Pressed && mouseUp)
{
State = SliderStates.Moused;
}
if (State == SliderStates.Pressed)
{
sliderValue = Math.Clamp((_mouseX - x) / w, 0, 1) *
(maxValue - minValue) + minValue;
}
}
