C# Grid.AddChild方法代码示例

		public void AutoRows4 ()
		{
			// See how rowspan = 3 affects this with 5 rows.
			Grid grid = new Grid ();

			grid.AddColumns (new GridLength (50), new GridLength (50));
			grid.AddRows (GridLength.Auto, GridLength.Auto, GridLength.Auto, GridLength.Auto, GridLength.Auto);

			// Give first child a rowspan of 2
			grid.AddChild (new LayoutPoker { Width = 50, Height = 50 }, 0, 0, 1, 1);
			grid.AddChild (new LayoutPoker { Width = 50, Height = 60 }, 0, 1, 3, 1);

			CreateAsyncTest (grid,
				() => {
					// If an element spans across multiple rows and one of those rows
					// is already large enough to contain that element, it puts itself
					// entirely inside that row
					grid.CheckRowHeights ("#1", 53.33, 3.33, 3.33, 0, 0);
					grid.ChangeRow (1, 1);
				}, () => {
					// An 'auto' row which has no children whose rowspan/colspan
					// *ends* in that row has a height of zero
					grid.CheckRowHeights ("#2", 50, 20, 20, 20, 0);
					grid.ChangeRow (1, 2);
				}, () => {
					// If an element which spans multiple rows is the only element in
					// the rows it spans, it divides evenly between the rows it spans
					grid.CheckRowHeights ("#3", 50, 0, 20, 20, 20);

					grid.ChangeRow (1, 0);
					grid.ChangeRow (0, 1);
				}, () => {
					// If there are two auto rows beside each other and an element spans those
					// two rows, the total height is averaged between the two rows.
					grid.CheckRowHeights ("#4", 3.33, 53.33, 3.33, 0, 0);
				}
			);
		}

		public void AutoRows2 ()
		{
			// Start off with two elements in the first row with the smaller element having rowspan = 2
			// and see how rowspan affects the rendering.
			Grid grid = new Grid ();

			grid.AddColumns (new GridLength (50), new GridLength (50));
			grid.AddRows (GridLength.Auto, GridLength.Auto, GridLength.Auto);

			grid.AddChild (new LayoutPoker { Width = 50, Height = 50 }, 0, 0, 2, 1);
			grid.AddChild (new LayoutPoker { Width = 50, Height = 60 }, 0, 1, 1, 1);

			// Start off with both elements at row 1, and the smaller element having rowspan = 2
			CreateAsyncTest (grid,
				() => {
					// If an element spans across multiple rows and one of those rows
					// is already large enough to contain that element, it puts itself
					// entirely inside that row
					grid.CheckRowHeights ("#1", 60, 0, 0);

					grid.ChangeRow (1, 1);
				}, () => {
					// An 'auto' row which has no children whose rowspan/colspan
					// *ends* in that row has a height of zero
					grid.CheckRowHeights ("#2", 0, 60, 0);
					grid.ChangeRow (1, 2);
				}, () => {
					// If an element which spans multiple rows is the only element in
					// the rows it spans, it divides evenly between the rows it spans
					grid.CheckRowHeights ("#2", 25, 25, 60);
					grid.ChangeRow (1, 0);
					grid.ChangeRow (0, 1);
				}, () => {
					grid.CheckRowHeights ("#2", 60, 25, 25);
				}
			);
		}

		public void AutoRows3 ()
		{
			// Start off with two elements in the first row with the larger element having rowspan = 2
			// and see how rowspan affects the rendering.
			Grid grid = new Grid ();

			grid.AddColumns (new GridLength (50), new GridLength (50));
			grid.AddRows (GridLength.Auto, GridLength.Auto, GridLength.Auto);

			grid.AddChild (new LayoutPoker { Width = 50, Height = 50 }, 0, 0, 1, 1);
			grid.AddChild (new LayoutPoker { Width = 50, Height = 60 }, 0, 1, 2, 1);

			CreateAsyncTest (grid,
				() => {
					grid.CheckRowHeights ("#1", 55, 5, 0);
					grid.ChangeRow (1, 1);
				}, () => {
					grid.CheckRowHeights ("#2", 50, 30, 30);
					grid.ChangeRow (1, 2);
				}, () => {
					grid.CheckRowHeights ("#3", 50, 0, 60);
					grid.ChangeRow (1, 0);
					grid.ChangeRow (0, 1);
				}, () => {
					grid.CheckRowHeights ("#3", 5, 55, 0);
				}
			);
		}

		public void SizeExceedsBounds2 ()
		{
			Grid grid = new Grid ();
			grid.RowDefinitions.Add (new RowDefinition { Height = new GridLength (50), MaxHeight = 60, MinHeight = 40 });
			grid.RowDefinitions.Add (new RowDefinition { Height = new GridLength (50), MaxHeight = 60, MinHeight = 40 });
			grid.AddChild (new MyContentControl (100, 1000), 0, 0, 0, 0);
			CreateAsyncTest (grid,
				() => {
					Assert.AreEqual (50, grid.RowDefinitions [0].ActualHeight, "#1");
					grid.ChangeRowSpan (0, 2);
				}, () => {
					Assert.AreEqual (50, grid.RowDefinitions [0].ActualHeight, "#1");
				}
			);
		}

		public void AutoRows ()
		{
			// This checks that rows expand to be large enough to hold the largest child
			Grid grid = new Grid ();

			grid.AddColumns (new GridLength (50), new GridLength (50));
			grid.AddRows (GridLength.Auto, GridLength.Auto);

			grid.AddChild (new LayoutPoker { Width = 50, Height = 50 }, 0, 0, 1, 1);
			grid.AddChild (new LayoutPoker { Width = 50, Height = 60 }, 0, 1, 1, 1);

			CreateAsyncTest (grid,
				() => {
					grid.CheckRowHeights ("#1", 60, 0);
					Grid.SetRow ((FrameworkElement) grid.Children [1], 1);
				}, () => {
					grid.CheckRowHeights ("#2", 50, 60);
				}
			);
		}

		public void AutoCol_Empty_MinWidth ()
		{
			// Ensure MinWidth is respected in an empty Auto segment
			var grid = new Grid();
			grid.AddColumns(Auto, Star);
			grid.ColumnDefinitions[0].MinWidth = 10;
			grid.AddChild(ContentControlWithChild(), 0, 1, 0, 0);

			CreateAsyncTest(grid, () => {
				grid.UpdateLayout();
				Assert.AreEqual(10, grid.ColumnDefinitions[0].ActualWidth, "#1");
			});
		}

		public void ExpandStarsInGrid ()
		{
			MyGrid grid = CreateGridWithChildren ();

			var parent = new Grid ();
			parent.AddRows (new GridLength (75));
			parent.AddColumns (new GridLength (75));
			parent.AddChild (grid, 0, 0, 1, 1);

			TestPanel.Width = 75;
			TestPanel.Height = 75;

			CreateAsyncTest (parent,
				() => {
					grid.CheckMeasureArgs ("#1a", new Size (12, 12), new Size (25, 12), new Size (38, 12),
												  new Size (12, 25), new Size (25, 25), new Size (38, 25),
												  new Size (12, 38), new Size (25, 38), new Size (38, 38));
					grid.CheckRowHeights ("#1", 12, 25, 38);

					grid.HorizontalAlignment = HorizontalAlignment.Left;
					grid.VerticalAlignment = VerticalAlignment.Center;
					parent.InvalidateSubtree ();
					grid.Reset ();
				}, () => {
					grid.CheckMeasureArgs ("#2a", new Size (12, 12), new Size (25, 12), new Size (38, 12),
												  new Size (12, 25), new Size (25, 25), new Size (38, 25),
												  new Size (12, 38), new Size (25, 38), new Size (38, 38));
					grid.CheckRowHeights ("#2", 12, 15, 15);

					grid.Width = 50;
					grid.Height = 50;
					parent.InvalidateSubtree ();
					grid.Reset ();
				}, () => {
					grid.CheckMeasureArgs ("#3a", new Size (8, 8), new Size (17, 8), new Size (25, 8),
												  new Size (8, 17), new Size (17, 17), new Size (25, 17),
												  new Size (8, 25), new Size (17, 25), new Size (25, 25));
					grid.CheckRowHeights ("#3", 8, 17, 25);

					grid.ClearValue (Grid.HorizontalAlignmentProperty);
					grid.ClearValue (Grid.VerticalAlignmentProperty);
					parent.InvalidateSubtree ();
					grid.Reset ();
				}, () => {
					grid.CheckMeasureArgs ("#4a", new Size (8, 8), new Size (17, 8), new Size (25, 8),
												  new Size (8, 17), new Size (17, 17), new Size (25, 17),
												  new Size (8, 25), new Size (17, 25), new Size (25, 25));
					grid.CheckRowHeights ("#4", 8, 17, 25);
				}
			);
		}

		public void StarStarRows_LimitedHeight_RowSpan_InfiniteSpace()
		{
			var grid = new Grid();
			grid.RowDefinitions.Add(new RowDefinition { Height = Star });
			grid.RowDefinitions.Add(new RowDefinition { MaxHeight = 20, Height = Star });

			var child1 = ContentControlWithChild();
			var child2 = ContentControlWithChild();
			(child1.Content as FrameworkElement).Height = 50;
			(child2.Content as FrameworkElement).Height = 70;
			grid.AddChild(child1, 0, 0, 1, 1);
			grid.AddChild(child2, 0, 0, 2, 1);

			grid.Measure(Infinity);
			Assert.AreEqual(Infinity, child1.MeasureOverrideArg, "#1");
			Assert.AreEqual(Infinity, child2.MeasureOverrideArg, "#2");
			Assert.AreEqual(new Size (50, 70), grid.DesiredSize, "#3");
		}

		public void StarRow_AutoStarCol_LimitedWidth()
		{
			var g = new Grid();
			var child = ContentControlWithChild();

			g.RowDefinitions.Add(new RowDefinition { Height = Star });
			g.ColumnDefinitions.Add(new ColumnDefinition { Width = Auto });
			g.ColumnDefinitions.Add(new ColumnDefinition { Width = Star, MaxWidth = 20 });
			g.AddChild(child, 0, 0, 1, 1);

			g.Measure(new Size(100, 100));
			Assert.AreEqual(new Size(inf, 100), child.MeasureOverrideArg, "#1");
		}

		public void MeasureAutoAndFixedRows ()
		{
			Grid grid = new Grid { };

			grid.AddColumns (new GridLength (50), new GridLength (50));
			grid.AddRows (new GridLength (20), new GridLength (20));
			grid.AddChild (new MyContentControl (50, 50), 0, 1, 2, 1);

			grid.Measure (Infinity);
			grid.CheckRowHeights ("#1", 20, 20);
			grid.CheckMeasureSizes ("#2", new Size (50, 40));
			Assert.AreEqual (new Size (100, 40), grid.DesiredSize, "#3");

			grid.RowDefinitions [0].Height = new GridLength (30);
			grid.Measure (Infinity);
			grid.CheckRowHeights ("#4", 30, 20);
			grid.CheckMeasureSizes ("#5", new Size (50, 50));
			Assert.AreEqual (new Size (100, 50), grid.DesiredSize, "#6");

			grid.RowDefinitions.Insert (0, new RowDefinition { Height = GridLength.Auto });
			grid.Measure (Infinity);
			grid.CheckRowHeights ("#7", double.PositiveInfinity, 30, 20);
			grid.CheckMeasureSizes ("#8", new Size (50, double.PositiveInfinity));
			Assert.AreEqual (new Size (100, 70), grid.DesiredSize, "#9");

			grid.Children.Clear ();
			grid.AddChild (new MyContentControl (50, 150), 0, 1, 2, 1);
			grid.Measure (Infinity);
			grid.CheckDesired ("#13", new Size (50, 150));
			grid.CheckRowHeights ("#10", double.PositiveInfinity, 30, 20);
			grid.CheckMeasureSizes ("#11", new Size (50, double.PositiveInfinity));
			grid.CheckMeasureResult ("#12", new Size (50, 150));
			Assert.AreEqual (new Size (100, 170), grid.DesiredSize, "#12");
		}

		public void StarStarRows_LimitedHeight_RowSpan_ExactSpace()
		{
			var grid = new Grid();
			grid.RowDefinitions.Add(new RowDefinition { Height = Star });
			grid.RowDefinitions.Add(new RowDefinition { MaxHeight = 20, Height = Star });

			var child1 = ContentControlWithChild();
			var child2 = ContentControlWithChild();
			(child1.Content as FrameworkElement).Height = 50;
			(child2.Content as FrameworkElement).Height = 70;

			grid.AddChild(child1, 0, 0, 1, 1);
			grid.AddChild(child2, 0, 0, 2, 1);

			Action<Size> sized = delegate {
				Assert.AreEqual(50, grid.RowDefinitions[0].ActualHeight, "#row 0 sized");
				Assert.AreEqual(20, grid.RowDefinitions[1].ActualHeight, "#row 1 sized");
			};

			child1.MeasureHook = sized;
			child2.MeasureHook = sized;
			grid.Measure(new Size(70, 70));

			// The row definitions have already been fully sized before the first
			// call to measure a child
			Assert.AreEqual(new Size(70, 50), child1.MeasureOverrideArg, "#1");
			Assert.AreEqual(new Size(70, 70), child2.MeasureOverrideArg, "#2");
			Assert.AreEqual(new Size(50, 70), grid.DesiredSize, "#3");
		}

		public void MeasureAutoRows4 ()
		{
			Grid grid = new Grid ();

			grid.AddColumns (new GridLength (50), new GridLength (50));
			grid.AddRows (GridLength.Auto, GridLength.Auto, GridLength.Auto, GridLength.Auto, GridLength.Auto);

			grid.AddChild (new MyContentControl (50, 30), 0, 1, 3, 1);
			grid.AddChild (new MyContentControl (50, 90), 0, 1, 1, 1);
			grid.AddChild (new MyContentControl (50, 50), 0, 1, 2, 1);

			grid.AddChild (new MyContentControl (50, 70), 1, 1, 4, 1);
			grid.AddChild (new MyContentControl (50, 120), 1, 1, 2, 1);
			grid.AddChild (new MyContentControl (50, 30), 2, 1, 3, 1);

			grid.AddChild (new MyContentControl (50, 10), 3, 1, 1, 1);
			grid.AddChild (new MyContentControl (50, 50), 3, 1, 2, 1);
			grid.AddChild (new MyContentControl (50, 80), 3, 1, 2, 1);

			grid.AddChild (new MyContentControl (50, 20), 4, 1, 1, 1);

			CreateAsyncTest (grid, () => {
				grid.CheckRowHeights ("#1", 90, 60, 60, 35, 45);
			});
		}

		public void MeasureAutoRows3 ()
		{
			Grid grid = new Grid ();

			grid.AddColumns (new GridLength (50), new GridLength (50));
			grid.AddRows (GridLength.Auto, GridLength.Auto, GridLength.Auto);

			grid.AddChild (new MyContentControl (50, 50), 0, 1, 2, 1);
			grid.AddChild (new MyContentControl (50, 60), 1, 1, 1, 1);
			grid.AddChild (new MyContentControl (50, 70), 0, 1, 3, 1);

			CreateAsyncTest (grid, () => {
				grid.CheckRowHeights ("#1", 3.33, 63.33, 3.33);
			});
		}

		public void MeasureMaxAndMin3 ()
		{
			Grid g = new Grid ();
			var child = new MyContentControl (50, 50);
			g.AddColumns (new GridLength (50));
			g.AddRows (new GridLength (20), new GridLength (20));
			g.AddChild (child, 0, 0, 2, 2);

			g.RowDefinitions [0].MaxHeight = 5;
			g.RowDefinitions [1].MaxHeight = 30;

			CreateAsyncTest (g,
				() => {
					var arg = child.MeasureOverrideArg;
					Assert.AreEqual (25, arg.Height, "#1");
					g.RowDefinitions [0].MaxHeight = 10;
				}, () => {
					var arg = child.MeasureOverrideArg;
					Assert.AreEqual (30, arg.Height, "#2");
					g.RowDefinitions [0].MaxHeight = 20;
				}, () => {
					var arg = child.MeasureOverrideArg;
					Assert.AreEqual (40, arg.Height, "#3");
				}
			);
		}

		public void AutoRows5 ()
		{
			Grid grid = new Grid ();

			grid.AddColumns (new GridLength (50));
			grid.AddRows (GridLength.Auto, GridLength.Auto, GridLength.Auto, GridLength.Auto, GridLength.Auto);

			grid.AddChild (new LayoutPoker { Width = 50, Height = 50 }, 0, 0, 3, 1);
			grid.AddChild (new LayoutPoker { Width = 50, Height = 60 }, 1, 0, 3, 1);

			// When calculating the heights of automatic rows, the children added to the grid
			// distribute their height in the opposite order in which they were added.
			CreateAsyncTest (grid,
				() => {
					// Here the element with height 60 distributes its height first
					grid.CheckRowHeights ("#1", 3.33, 23.33, 23.33, 20, 0);
					grid.ChangeRow (1, 1);

					grid.ChangeRow (0, 1);
					grid.ChangeRow (1, 0);
				}, () => {
					// Reversing the rows does not stop the '60' element from
					// Distributing its height first
					grid.CheckRowHeights ("#2", 20, 23.33, 23.33, 3.33, 0);

					// Now reverse the order in which the elements are added so that
					// the '50' element distributes first.
					grid.Children.Clear ();
					grid.AddChild (new LayoutPoker { Width = 50, Height = 60 }, 1, 0, 3, 1);
					grid.AddChild (new LayoutPoker { Width = 50, Height = 50 }, 0, 0, 3, 1);

				}, () => {
					grid.CheckRowHeights ("#3", 16.66, 25.55, 25.55, 8.88, 0);
					grid.ChangeRow (1, 1);

					grid.ChangeRow (0, 1);
					grid.ChangeRow (1, 0);
				}, () => {
					grid.CheckRowHeights ("#4", 16.66, 25.55, 25.55, 8.88, 0);
				}
			);
		}