support for GTK 3.98.3

examples/gtk3/colorpickers.nim

@@ -0,0 +1,55 @@
+# nim c button.nim
+import gintro/[gtk, glib, gobject, gio, cairo]
+from math import Tau
+
+type
+  ColorPicker = ref object of Button
+    c: array[4, float]
+
+proc newColorPicker(c: array[4, float]): ColorPicker =
+  result = newButton(ColorPicker)
+  result.c = c
+
+proc buttonClicked (button: ColorPicker) =
+  #button.label = utf8Strreverse(button.label, -1)
+  echo "clicked"
+
+proc draw(b: ColorPicker; cr: cairo.Context): bool =
+  echo "draw"
+  let x = getAllocatedWidth(b).float / 2
+  let y = getAllocatedHeight(b).float / 2
+  cr.moveTo(x, y)
+  cr.newPath
+  cr.arc(x, y, 10, 0, math.Tau)
+  cr.setSource(b.c)
+  cr.setLineWidth(5)
+  cr.stroke
+
+proc appActivate (app: Application) =
+  let window = newApplicationWindow(app)
+  window.title = "GNOME Button"
+  window.defaultSize = (250, 50)
+  let box = newBox(Orientation.horizontal, 0)
+  var button = newColorPicker([1.0, 0, 0, 1])#newButton(ColorPicker)#"Click Me")
+  box.add(button)
+  button.connect("clicked",  buttonClicked)
+  button.connectAfter("draw", draw)
+  button = newColorPicker([0.0, 0, 1, 1])#newButton(ColorPicker)#"Click Me")
+  box.add(button)
+  button.connect("clicked",  buttonClicked)
+  button.connectAfter("draw", draw)
+  button = newColorPicker([0.0, 1, 0, 1])#newButton(ColorPicker)#"Click Me")
+  box.add(button)
+  button.connect("clicked",  buttonClicked)
+  button.connectAfter("draw", draw)
+  window.add(box)
+
+  window.showAll
+
+proc main =
+  let app = newApplication("org.gtk.example")
+  connect(app, "activate", appActivate)
+  discard app.run
+
+main()
+