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+using UICatalog.Scenarios;
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+using Xunit.Abstractions;
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+
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+namespace Terminal.Gui.ViewTests;
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+
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+/// <summary>
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+/// Tests View.FindDeepestView
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+/// </summary>
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+/// <param name="output"></param>
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+public class FindDeepestViewTests (ITestOutputHelper output)
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+{
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+ // Test that FindDeepestView returns the correct view if the start view has no subviews
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+ [Theory]
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+ [InlineData (0, 0)]
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+ [InlineData (1, 1)]
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+ [InlineData (2, 2)]
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+ public void Returns_Start_If_No_SubViews (int testX, int testY)
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+ {
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+ var view = new View ()
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+ {
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+ Width = 10, Height = 10,
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+ };
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+
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+ Assert.Same (view, View.FindDeepestView (view, testX, testY, out _, out _));
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+ }
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+
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+ // Test that FindDeepestView returns null if the start view has no subviews and coords are outside the view
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+ [Theory]
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+ [InlineData (0, 0)]
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+ [InlineData (2, 1)]
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+ [InlineData (20, 20)]
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+ public void Returns_Null_If_No_SubViews_Coords_Outside (int testX, int testY)
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+ {
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+ var view = new View ()
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+ {
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+ X = 1, Y = 2,
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+ Width = 10, Height = 10,
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+ };
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+
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+ Assert.Null(View.FindDeepestView (view, testX, testY, out _, out _));
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+ }
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+
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+ // Test that FindDeepestView returns the correct view if the start view has subviews
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+ [Theory]
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+ [InlineData (0, 0, false)]
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+ [InlineData (1, 1, false)]
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+ [InlineData (9, 9, false)]
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+ [InlineData (10, 10, false)]
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+ [InlineData (6, 7, false)]
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+
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+ [InlineData (1, 2, true)]
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+ [InlineData (5, 6, true)]
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+ public void Returns_Correct_If_SubViews (int testX, int testY, bool expectedSubViewFound)
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+ {
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+ var view = new View ()
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+ {
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+ Width = 10, Height = 10,
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+ };
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+
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+ var subview = new View ()
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+ {
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+ X = 1, Y = 2,
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+ Width = 5, Height = 5,
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+ };
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+ view.Add (subview);
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+
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+ var found = View.FindDeepestView (view, testX, testY, out _, out _);
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+
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+ Assert.Equal (expectedSubViewFound, found == subview);
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+ }
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+
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+ // Test that FindDeepestView works if the start view has positive Adornments
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+ [Theory]
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+ [InlineData (0, 0, false)]
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+ [InlineData (1, 1, false)]
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+ [InlineData (9, 9, false)]
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+ [InlineData (10, 10, false)]
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+ [InlineData (7, 8, false)]
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+ [InlineData (1, 2, false)]
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+
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+ [InlineData (2, 3, true)]
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+ [InlineData (5, 6, true)]
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+ [InlineData (2, 3, true)]
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+ [InlineData (6, 7, true)]
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+ public void Returns_Correct_If_Start_Has_Adornments (int testX, int testY, bool expectedSubViewFound)
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+ {
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+ var view = new View ()
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+ {
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+ Width = 10, Height = 10,
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+ };
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+ view.Margin.Thickness = new Thickness (1);
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+
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+ var subview = new View ()
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+ {
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+ X = 1, Y = 2,
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+ Width = 5, Height = 5,
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+ };
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+ view.Add (subview);
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+
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+ var found = View.FindDeepestView (view, testX, testY, out _, out _);
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+
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+ Assert.Equal (expectedSubViewFound, found == subview);
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+ }
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+
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+ // Test that FindDeepestView works if the subview has positive Adornments
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+ [Theory]
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+ [InlineData (0, 0, false)]
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+ [InlineData (1, 1, false)]
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+ [InlineData (9, 9, false)]
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+ [InlineData (10, 10, false)]
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+ [InlineData (7, 8, false)]
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+ [InlineData (6, 7, false)]
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+
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+ [InlineData (1, 2, true)]
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+ [InlineData (2, 3, true)]
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+ [InlineData (5, 6, true)]
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+ [InlineData (2, 3, true)]
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+ public void Returns_Correct_If_SubView_Has_Adornments (int testX, int testY, bool expectedSubViewFound)
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+ {
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+ var view = new View ()
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+ {
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+ Width = 10, Height = 10,
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+ };
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+
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+ var subview = new View ()
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+ {
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+ X = 1, Y = 2,
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+ Width = 5, Height = 5,
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+ };
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+ subview.Margin.Thickness = new Thickness (1);
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+ view.Add (subview);
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+
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+ var found = View.FindDeepestView (view, testX, testY, out _, out _);
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+
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+ Assert.Equal (expectedSubViewFound, found == subview);
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+ }
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+
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+ // Test that FindDeepestView works with nested subviews
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+ [Theory]
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+ [InlineData (0, 0, -1)]
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+ [InlineData (9, 9, -1)]
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+ [InlineData (10, 10, -1)]
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+
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+ [InlineData (1, 1, 0)]
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+ [InlineData (1, 2, 0)]
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+ [InlineData (2, 2, 1)]
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+ [InlineData (3, 3, 2)]
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+ [InlineData (5, 5, 2)]
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+ public void Returns_Correct_With_NestedSubViews (int testX, int testY, int expectedSubViewFound)
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+ {
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+ var start = new View ()
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+ {
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+ Width = 10, Height = 10
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+ };
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+
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+ int numSubViews = 3;
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+ List<View> subviews = new List<View> ();
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+ for (int i = 0; i < numSubViews; i++)
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+ {
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+ var subview = new View ()
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+ {
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+ X = 1, Y = 1,
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+ Width = 5, Height = 5,
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+ };
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+ subviews.Add (subview);
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+
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+ if (i > 0)
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+ {
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+ subviews [i - 1].Add (subview);
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+ }
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+ }
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+
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+ start.Add (subviews [0]);
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+
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+ var found = View.FindDeepestView (start, testX, testY, out _, out _);
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+ Assert.Equal (expectedSubViewFound, subviews.IndexOf(found));
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+ }
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+}
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