Dragging

See the DraggingDemo.cs.

using Gridrand.Contracts;
namespace Gridrand.RimGui.Manual
{
    /// <summary>
    /// Demonstrates a simple dragging interaction using an offset.
    /// </summary>
    class DraggingDemo : ManualBase, IManual
    {
        Vector2 offset;

        public DraggingDemo(ManualBaseResource p) : base(p)
        {
        }

        public void Draw()
        {
            Gui.LabelInput("offset", ref offset);

            // Allocate a 100x100 rectangle for the dragging area.
            var rect = Ctx.AllocateRect(100, 100);

            // Render a box to visualize the area.
            Gui.Box(rect);
            // Define an interactive area for detecting user interaction.
            Gui.NextRect(rect).InteractiveArea();

            // If the interactive area is active, update the offset based on pointer movement.
            if (Ctx.IsWidgetActive<InteractiveAreaWidget>())
            {
                offset += Input.Pointer.DeltaPos;
            }

            // Prevents drawing outside the rect.
            using (Ctx.PushClip(rect))
            {
                // Render a sprite inside the dragging area, offset by the user interaction.
                Gui.NextRect(new Rect(rect.x + offset.x, rect.y + offset.y, 20 * Style.ScaleFactor, 20 * Style.ScaleFactor))
                    .Image(Resource.Assets.SampleTexture);
            }
        }
    }
}