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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Drawing;
using System.Windows.Forms.Layout;
namespace System.Windows.Forms.UITests;
public class AnchorLayoutTests : ControlTestBase
{
private const AnchorStyles AnchorAllDirection = AnchorStyles.Left | AnchorStyles.Top | AnchorStyles.Right | AnchorStyles.Bottom;
public AnchorLayoutTests(ITestOutputHelper testOutputHelper)
: base(testOutputHelper)
{
}
[WinFormsTheory]
[InlineData(AnchorStyles.Top, 120, 30, 20, 30)]
[InlineData(AnchorStyles.Left, 20, 180, 20, 30)]
[InlineData(AnchorStyles.Right, 220, 180, 20, 30)]
[InlineData(AnchorStyles.Bottom, 120, 330, 20, 30)]
[InlineData(AnchorStyles.Top | AnchorStyles.Left, 20, 30, 20, 30)]
[InlineData(AnchorStyles.Top | AnchorStyles.Right, 220, 30, 20, 30)]
[InlineData(AnchorStyles.Top | AnchorStyles.Bottom, 120, 30, 20, 330)]
[InlineData(AnchorStyles.Left | AnchorStyles.Right, 20, 180, 220, 30)]
[InlineData(AnchorStyles.Bottom | AnchorStyles.Right | AnchorStyles.Top | AnchorStyles.Left, 20, 30, 220, 330)]
public void Control_ResizeAnchoredControls_ParentHandleCreated_NewAnchorsApplied(AnchorStyles anchors, int expectedX, int expectedY, int expectedWidth, int expectedHeight)
{
LaunchFormAndVerify(anchors, expectedX, expectedY, expectedWidth, expectedHeight);
}
[WinFormsTheory]
[InlineData(AnchorStyles.Top, 120, 30, 20, 30)]
[InlineData(AnchorStyles.Left, 20, 180, 20, 30)]
[InlineData(AnchorStyles.Right, 220, 180, 20, 30)]
[InlineData(AnchorStyles.Bottom, 120, 330, 20, 30)]
[InlineData(AnchorStyles.Top | AnchorStyles.Left, 20, 30, 20, 30)]
[InlineData(AnchorStyles.Top | AnchorStyles.Right, 220, 30, 20, 30)]
[InlineData(AnchorStyles.Top | AnchorStyles.Bottom, 120, 30, 20, 330)]
[InlineData(AnchorStyles.Left | AnchorStyles.Right, 20, 180, 220, 30)]
[InlineData(AnchorStyles.Bottom | AnchorStyles.Right | AnchorStyles.Top | AnchorStyles.Left, 20, 30, 220, 330)]
public void Control_AnchorLayoutV2_ResizeAnchoredControls_ParentHandleCreated_NewAnchorsApplied(AnchorStyles anchors, int expectedX, int expectedY, int expectedWidth, int expectedHeight)
{
using AnchorLayoutV2Scope scope = new(enable: true);
LaunchFormAndVerify(anchors, expectedX, expectedY, expectedWidth, expectedHeight);
}
[WinFormsFact]
public void Control_NotParented_AnchorsNotComputed()
{
using AnchorLayoutV2Scope scope = new(enable: true);
(Form form, Button button) = GetFormWithAnchoredButton(AnchorAllDirection);
try
{
DefaultLayout.AnchorInfo? anchorInfo = DefaultLayout.GetAnchorInfo(button);
Assert.Null(anchorInfo);
// Unparent button and resume layout.
form.Controls.Remove(button);
form.ResumeLayout(performLayout: false);
anchorInfo = DefaultLayout.GetAnchorInfo(button);
Assert.Null(anchorInfo);
}
finally
{
Dispose(form, button);
}
}
[WinFormsFact]
public void Control_SuspendedLayout_AnchorsNotComputed()
{
using AnchorLayoutV2Scope scope = new(enable: true);
(Form form, Button button) = GetFormWithAnchoredButton(AnchorAllDirection);
try
{
DefaultLayout.AnchorInfo? anchorInfo = DefaultLayout.GetAnchorInfo(button);
Assert.Null(anchorInfo);
form.Controls.Add(button);
anchorInfo = DefaultLayout.GetAnchorInfo(button);
Assert.Null(anchorInfo);
}
finally
{
Dispose(form, button);
}
}
[WinFormsFact]
public void Control_ResumedLayout_AnchorsComputed()
{
using AnchorLayoutV2Scope scope = new(enable: true);
(Form form, Button button) = GetFormWithAnchoredButton(AnchorAllDirection);
try
{
DefaultLayout.AnchorInfo? anchorInfo = DefaultLayout.GetAnchorInfo(button);
Assert.Null(anchorInfo);
form.Controls.Add(button);
anchorInfo = DefaultLayout.GetAnchorInfo(button);
Assert.Null(anchorInfo);
form.ResumeLayout(performLayout: false);
anchorInfo = DefaultLayout.GetAnchorInfo(button);
Assert.NotNull(anchorInfo);
}
finally
{
Dispose(form, button);
}
}
[WinFormsFact]
public void ConfigSwitch_Disabled_SuspendedLayout_AnchorsComputed()
{
using AnchorLayoutV2Scope scope = new(enable: false);
(Form form, Button button) = GetFormWithAnchoredButton(AnchorAllDirection);
try
{
form.Controls.Add(button);
DefaultLayout.AnchorInfo? anchorInfo = DefaultLayout.GetAnchorInfo(button);
Assert.NotNull(anchorInfo);
}
finally
{
Dispose(form, button);
}
}
[WinFormsFact]
public void NestedContainer_AnchorsComputed()
{
using AnchorLayoutV2Scope scope = new(enable: true);
(Form form, Button button) = GetFormWithAnchoredButton(AnchorAllDirection);
try
{
using ContainerControl container = new();
container.Dock = DockStyle.Fill;
container.SuspendLayout();
container.Controls.Add(button);
DefaultLayout.AnchorInfo? anchorInfo = DefaultLayout.GetAnchorInfo(button);
Assert.Null(anchorInfo);
form.Controls.Add(container);
Assert.Null(anchorInfo);
container.ResumeLayout(false);
form.ResumeLayout(false);
anchorInfo = DefaultLayout.GetAnchorInfo(button);
Assert.NotNull(anchorInfo);
}
finally
{
Dispose(form, button);
}
}
[WinFormsFact]
public void ParentChanged_AnchorsUpdated()
{
using AnchorLayoutV2Scope scope = new(enable: true);
(Form form, Button button) = GetFormWithAnchoredButton(AnchorAllDirection);
try
{
using ContainerControl container = new();
container.Dock = DockStyle.Fill;
container.SuspendLayout();
container.Controls.Add(button);
DefaultLayout.AnchorInfo? anchorInfo = DefaultLayout.GetAnchorInfo(button);
Assert.Null(anchorInfo);
form.Controls.Add(container);
Assert.Null(anchorInfo);
container.ResumeLayout(false);
form.ResumeLayout(false);
anchorInfo = DefaultLayout.GetAnchorInfo(button);
Assert.NotNull(anchorInfo);
container.Controls.Remove(button);
Assert.NotNull(anchorInfo);
var previousDisplayRect = anchorInfo.DisplayRectangle;
form.Controls.Add(button);
Assert.NotEqual(previousDisplayRect, anchorInfo.DisplayRectangle);
}
finally
{
Dispose(form, button);
}
}
[WinFormsFact]
public void AnchorLayoutV2_ReplaceParentWhileAncestorLayoutSuspended_AnchorsRemainConsistent()
{
// Regression test for https://github.com/dotnet/winforms/issues/14500
using AnchorLayoutV2Scope scope = new(enable: true);
using Form form = new() { ClientSize = new Size(400, 300) };
using Panel originalPanel = new()
{
Anchor = AnchorStyles.Top | AnchorStyles.Bottom | AnchorStyles.Left | AnchorStyles.Right,
Location = new Point(20, 30),
Size = new Size(100, 120)
};
using Panel replacementPanel = new();
form.Controls.Add(originalPanel);
form.ResumeLayout(performLayout: true);
form.ClientSize = new Size(500, 350);
Assert.Equal(new Rectangle(20, 30, 200, 170), originalPanel.Bounds);
ReplaceControl(originalPanel, replacementPanel);
Assert.Equal(originalPanel.Anchor, replacementPanel.Anchor);
Assert.Equal(new Rectangle(20, 30, 200, 170), replacementPanel.Bounds);
form.ClientSize = new Size(600, 400);
Assert.Equal(new Rectangle(20, 30, 300, 220), replacementPanel.Bounds);
static void ReplaceControl(Control controlToRemove, Control controlToAdd)
{
controlToRemove.SuspendLayout();
controlToAdd.SuspendLayout();
controlToAdd.Anchor = controlToRemove.Anchor;
controlToAdd.Dock = controlToRemove.Dock;
controlToAdd.Location = controlToRemove.Location;
controlToAdd.Size = controlToRemove.Size;
controlToRemove.ResumeLayout(true);
controlToAdd.ResumeLayout(true);
Control parentOfControlToRemove = controlToRemove.Parent!;
Control? parentOfControlToAdd = controlToAdd.Parent;
int index = parentOfControlToRemove.Controls.IndexOf(controlToRemove);
parentOfControlToRemove.SuspendLayout();
if (parentOfControlToAdd is { } parentToSuspend)
{
parentToSuspend.SuspendLayout();
}
parentOfControlToRemove.Controls.Remove(controlToRemove);
parentOfControlToRemove.Controls.Add(controlToAdd);
parentOfControlToRemove.Controls.SetChildIndex(controlToAdd, index);
parentOfControlToRemove.ResumeLayout(true);
if (parentOfControlToAdd is { } parentToResume)
{
parentToResume.ResumeLayout(true);
}
}
}
[WinFormsFact]
public void SetBoundsOnAnchoredControl_BoundsChanged()
{
using AnchorLayoutV2Scope scope = new(enable: true);
(Form form, Button button) = GetFormWithAnchoredButton(AnchorAllDirection);
try
{
form.Controls.Add(button);
DefaultLayout.AnchorInfo? anchorInfo = DefaultLayout.GetAnchorInfo(button);
Assert.Null(anchorInfo);
form.ResumeLayout(false);
anchorInfo = DefaultLayout.GetAnchorInfo(button);
Assert.NotNull(anchorInfo);
var bounds = button.Bounds;
button.SetBounds(bounds.X + 5, bounds.Y + 5, bounds.Width + 10, bounds.Height + 10, BoundsSpecified.None);
Assert.Equal(bounds, button.Bounds); // Bounds Specified is None.
button.SetBounds(bounds.X + 5, bounds.Y + 5, bounds.Width + 10, bounds.Height + 10, BoundsSpecified.All);
Assert.NotEqual(bounds, button.Bounds); // Bounds Specified is None.
bounds = button.Bounds;
button.SetBounds(bounds.X + 5, bounds.Y + 5, bounds.Width + 10, bounds.Height + 10);
Assert.NotEqual(bounds, button.Bounds);
}
finally
{
Dispose(form, button);
}
}
private static void LaunchFormAndVerify(AnchorStyles anchors, int expectedX, int expectedY, int expectedWidth, int expectedHeight)
{
(Form form, Button button) = GetFormWithAnchoredButton(anchors);
Rectangle newButtonBounds = button.Bounds;
try
{
form.ResumeLayout(true);
form.Controls.Add(button);
form.Shown += OnFormShown;
form.ShowDialog();
Assert.Equal(expectedX, newButtonBounds.X);
Assert.Equal(expectedY, newButtonBounds.Y);
Assert.Equal(expectedWidth, newButtonBounds.Width);
Assert.Equal(expectedHeight, newButtonBounds.Height);
}
finally
{
Dispose(form, button);
}
return;
void OnFormShown(object? sender, EventArgs e)
{
// Resize the form to compute button anchors.
form.Size = new Size(400, 600);
newButtonBounds = button.Bounds;
form.Close();
}
}
private static (Form, Button) GetFormWithAnchoredButton(AnchorStyles buttonAnchors)
{
Form form = new()
{
Size = new Size(200, 300)
};
form.SuspendLayout();
Button button = new()
{
Location = new Point(20, 30),
Size = new Size(20, 30),
Anchor = buttonAnchors
};
DefaultLayout.AnchorInfo? anchorInfo = DefaultLayout.GetAnchorInfo(button);
Assert.Null(anchorInfo);
return (form, button);
}
private static void Dispose(Form form, Button button)
{
button.Dispose();
form.Dispose();
}
}
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