class VisualResults {
    width: Number
    height: Number
    childX: Number
    childY: Number
    color: String
}
class ProbeRect: RectBlock {
    results: VisualResults
    function onMount(self: ProbeRect, mount: Mount): Unit {
        measured = self.measure(mount, Constraints(0, 0, 120, 80))
        self.results.width = measured.width
        self.results.height = measured.height
        drawing = self.paint(mount, Bounds(12, 18, 200, 60))
        self.results.color = drawing.commands.at(0).color
    }
}
class ProbeColumn: Column {
    results: VisualResults
    function onMount(self: ProbeColumn, mount: Mount): Unit {
        positions = self.arrange(mount, Bounds(20, 30, 500, 300))
        self.results.childX = positions.children.at(0).x
        self.results.childY = positions.children.at(0).y
    }
}
results = VisualResults(0, 0, 0, 0, "等待挂载")
rect = ProbeRect(200, 60, 12, "#DDEEFF", results)
root = ProbeColumn(24, 16, TextBlock("对象的原生视觉协议", 2), rect, TextBlock("约束测量宽度"), ui.textOf(results, "width"), TextBlock("绘制颜色"), ui.textOf(results, "color"), results)
page = Page()
page.render(root)