Add gallery app, native window and architecture tests

gallery/widgets.go

@@ -0,0 +1,56 @@
+package gallery
+
+import (
+	"github.com/egoist/mygo/ui"
+
+	"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
+)
+
+// press is a clickable box; w ≤ 0 stretches.
+func press(c *ui.Context, w, h int, label string, draw func(g pixel.Canvas, st pixel.State)) bool {
+	k := pixel.K(c)
+	shell, base, st := pixel.Shell(c, func() *ui.Element { return ui.ButtonBase(c).Label(label) })
+	if w > 0 {
+		shell.Width(k.D(w))
+	}
+	shell.Height(k.D(h)).Draw(func(p *ui.Painter, r ui.Rect) {
+		g := k.Canvas(p, r)
+		draw(g, st)
+		if st.Focus {
+			g.FocusMark(0, 0, g.W, g.H)
+		}
+	})
+	return base.Clicked()
+}
+
+// button is a raised pixel button with a centered label.
+func button(c *ui.Context, label string) bool {
+	return press(c, pixel.Measure(label)+12, 16, label, func(g pixel.Canvas, st pixel.State) {
+		y := 0
+		if st.Press {
+			y = 1
+		}
+		g.Frame(0, y, g.W, g.H-1, pixel.Raised, pixel.Face)
+		g.Text((g.W-pixel.Measure(label))/2, y, label, pixel.Ink, 1)
+	})
+}
+
+// panel is a framed box with padding for children.
+func panel(c *ui.Context, style pixel.FrameStyle, fill pixel.Slot, pad int) *ui.Element {
+	k := pixel.K(c)
+	return ui.Column(c).Padding(k.D(pad)).Draw(func(p *ui.Painter, r ui.Rect) {
+		g := k.Canvas(p, r)
+		g.Frame(0, 0, g.W, g.H, style, fill)
+	})
+}
+
+// shadowText draws text with a one-dot shadow.
+func shadowText(g pixel.Canvas, x, y int, s string, ink pixel.Slot, scale int) {
+	g.Text(x+scale, y+scale, s, pixel.Shade, scale)
+	g.Text(x, y, s, ink, scale)
+}
+
+// label is non-wrapping pixel text.
+func label(c *ui.Context, s string, ink pixel.Slot) *ui.Element {
+	return pixel.Text(c, s, pixel.TextOptions{Slot: ink})
+}