Add initial online library, component button and form

src/Robots.Grasshopper/ComponentButton.cs

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+using System.Drawing;
+using System.Windows.Forms;
+using Grasshopper.Kernel;
+using Grasshopper.Kernel.Attributes;
+using Grasshopper.GUI;
+using Grasshopper.GUI.Canvas;
+
+namespace Robots.Grasshopper;
+
+class ComponentButton : GH_ComponentAttributes
+{
+    const int _buttonSize = 18;
+
+    readonly string _label;
+    readonly Action _action;
+
+    RectangleF _buttonBounds;
+    bool _mouseDown;
+
+    public ComponentButton(GH_Component owner, string label, Action action) : base(owner)
+    {
+        _label = label;
+        _action = action;
+    }
+
+    protected override void Layout()
+    {
+        base.Layout();
+
+        const int margin = 3;
+
+        var bounds = GH_Convert.ToRectangle(Bounds);
+        var button = bounds;
+
+        button.X += margin;
+        button.Width -= margin * 2;
+        button.Y = bounds.Bottom;
+        button.Height = _buttonSize;
+
+        bounds.Height += _buttonSize + margin;
+
+        Bounds = bounds;
+        _buttonBounds = button;
+    }
+
+    protected override void Render(GH_Canvas canvas, Graphics graphics, GH_CanvasChannel channel)
+    {
+        base.Render(canvas, graphics, channel);
+
+        if (channel == GH_CanvasChannel.Objects)
+        {
+            var prototype = GH_FontServer.StandardAdjusted;
+            var font = GH_FontServer.NewFont(prototype, 6f / GH_GraphicsUtil.UiScale);
+            var radius = 3;
+            var highlight = !_mouseDown ? 8 : 0;
+
+            using var button = GH_Capsule.CreateTextCapsule(_buttonBounds, _buttonBounds, GH_Palette.Black, _label, font, radius, highlight);
+            button.Render(graphics, false, Owner.Locked, false);
+        }
+    }
+
+    void SetMouseDown(bool value, GH_Canvas canvas, GH_CanvasMouseEvent e)
+    {
+        if (Owner.Locked || _mouseDown == value)
+            return;
+
+        if (value && e.Button != MouseButtons.Left)
+            return;
+
+        if (!_buttonBounds.Contains(e.CanvasLocation))
+            return;
+
+        if (_mouseDown && !value)
+            _action();
+
+        _mouseDown = value;
+        canvas.Invalidate();
+    }
+
+    public override GH_ObjectResponse RespondToMouseDown(GH_Canvas sender, GH_CanvasMouseEvent e)
+    {
+        SetMouseDown(true, sender, e);
+        return base.RespondToMouseDown(sender, e);
+    }
+
+    public override GH_ObjectResponse RespondToMouseUp(GH_Canvas sender, GH_CanvasMouseEvent e)
+    {
+        SetMouseDown(false, sender, e);
+        return base.RespondToMouseUp(sender, e);
+    }
+
+    public override GH_ObjectResponse RespondToMouseMove(GH_Canvas sender, GH_CanvasMouseEvent e)
+    {
+        SetMouseDown(false, sender, e);
+        return base.RespondToMouseMove(sender, e);
+    }
+}

src/Robots.Grasshopper/ComponentForm.cs

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+using System.ComponentModel;
+using Eto.Drawing;
+using Eto.Forms;
+
+namespace Robots.Grasshopper;
+
+class ComponentForm : Form
+{
+    public ComponentForm()
+    {
+        Maximizable = false;
+        Minimizable = false;
+        Resizable = false;
+        Topmost = true;
+        ShowInTaskbar = true;
+        Owner = Rhino.UI.RhinoEtoApp.MainWindow;
+    }
+
+    public override bool Visible
+    {
+        get => base.Visible;
+        set
+        {
+            if (value)
+                CenterOnMouse();
+
+            base.Visible = value;
+        }
+    }
+
+    void CenterOnMouse()
+    {
+        var mousePos = Mouse.Position;
+        int x = (int)mousePos.X + 20;
+        int y = (int)mousePos.Y - MinimumSize.Height / 2;
+        Location = new Point(x, y);
+    }
+
+    protected override void OnClosing(CancelEventArgs e)
+    {
+        Visible = false;
+        e.Cancel = true;
+
+        base.OnClosing(e);
+    }
+}