public static bool BuildSlider(this ImGui gui, float value, out float newValue, float width = 10f)
{
var sliderRect = gui.AllocateRect(width, 2f, RectAlignment.Full);
var handleStart = (sliderRect.Width - 1f) * value;
var handleRect = new Rect(sliderRect.X + handleStart, sliderRect.Y, 1f, sliderRect.Height);
var update = false;
newValue = value;
switch (gui.action)
{
case ImGuiAction.Build:
gui.DrawRectangle(handleRect, gui.IsMouseOverOrDown(sliderRect) ? SchemeColor.Background : SchemeColor.PureBackground, RectangleBorder.Thin);
sliderRect.Y += (sliderRect.Height - 0.3f) / 2f;
sliderRect.Height = 0.3f;
gui.DrawRectangle(sliderRect, SchemeColor.Grey);
break;
case ImGuiAction.MouseMove:
if (gui.IsMouseDown(sliderRect))
{
update = true;
}
else
{
gui.ConsumeMouseOver(sliderRect, RenderingUtils.cursorHand);
}
break;
case ImGuiAction.MouseDown:
if (gui.IsMouseOver(sliderRect))
{
gui.ConsumeMouseDown(sliderRect);
update = true;
}
break;
}
if (!update)
{
return(false);
}
var positionX = (gui.mousePosition.X - sliderRect.X - 0.5f) / (sliderRect.Width - 1f);
newValue = MathUtils.Clamp(positionX, 0f, 1f);
gui.Rebuild();
return(true);
}