/*

    Copyright (C) 2016 Apple Inc. All Rights Reserved.

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    Defines tests to ensure that some of our layouts are working as expected.

*/

import XCTest

/**

    A simple layout type to use for testing. We can check the frame after laying

    out the rect to see the effect of composing other layouts. Note that this layout's

    `Content` is also a `TestLayout`, so these layouts will be at the leaves.

*/

struct TestLayout: Layout {

    typealias Content = TestLayout

    var frame: CGRect

    init(frame: CGRect = .zero) {

        self.frame = frame

    }

    mutating func layout(in rect: CGRect) {

        self.frame = rect

    }

    var contents: [Content] {

        return [self]

    }

}

class LayoutTests: XCTestCase {

    func testLayout() {

        let child1 = TestLayout()

        let child2 = TestLayout()

        var layout = DecoratingLayout(content: child1, decoration: child2)

        layout.layout(in: CGRect(x: 0, y: 0, width: 90, height: 40))

        // Check to see that the frames are at the expected values.

        XCTAssertEqual(layout.contents[0].frame, CGRect(x: 0, y: 5, width: 25, height: 30))

        XCTAssertEqual(layout.contents[1].frame, CGRect(x: 35, y: 5, width: 50, height: 30))

    }

}