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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.
#nullable enable
using System.Collections;
using System.ComponentModel.Design;
using Moq;
namespace System.Windows.Forms.Design.Tests;
public class TabControlDesignerTests
{
private (TabControlDesigner designer, TabControl tabControl) CreateInitializedDesignerWithServiceProvider(out Mock<IServiceProvider> serviceProvider, out Mock<IDesignerHost> designerHost)
{
TabControl tabControl = new();
TabControlDesigner designer = new();
serviceProvider = new();
designerHost = new();
serviceProvider.Setup(s => s.GetService(typeof(IDesignerHost))).Returns(designerHost.Object);
designer.Initialize(tabControl);
return (designer, tabControl);
}
private (TabControlDesigner designer, TabControl tabControl, TabPage tabPage) CreateDesignerWithMockedHost()
{
TabControlDesigner designer = new();
TabControl tabControl = new();
TabPage tabPage = new();
Mock<IServiceProvider> serviceProvider = new();
Mock<IDesignerHost> designerHost = new();
serviceProvider.Setup(s => s.GetService(typeof(IDesignerHost))).Returns(designerHost.Object);
designerHost.Setup(h => h.CreateComponent(typeof(TabPage))).Returns(tabPage);
designer.Initialize(tabControl);
return (designer, tabControl, tabPage);
}
[Fact]
public void InitializeNewComponent_ShouldAddTabPageToTabControl()
{
var (designer, tabControl) = CreateInitializedDesignerWithServiceProvider(out _, out var designerHost);
using (designer)
using (tabControl)
{
using TabPage tabPage = new();
tabControl.TabPages.Add(tabPage);
designerHost.Setup(h => h.CreateComponent(typeof(TabPage))).Returns(tabPage);
designer.InitializeNewComponent(new Hashtable());
tabControl.TabPages.Count.Should().Be(1);
}
}
[Theory]
[InlineData(typeof(TabPage), true)]
[InlineData(typeof(Button), false)]
public void CanParent_ReturnsExpectedResult(Type controlType, bool expected)
{
var (designer, tabControl) = CreateInitializedDesignerWithServiceProvider(out _, out _);
using (designer)
using (tabControl)
{
designer.Initialize(tabControl);
Control? control = Activator.CreateInstance(controlType) as Control;
if (control is TabPage tabPage && !expected)
{
tabControl.TabPages.Add(tabPage);
}
bool result = designer.CanParent(control);
result.Should().Be(expected);
}
}
[Fact]
public void Verbs_ContainsAddAndRemoveVerbs()
{
var (designer, tabControl, tabPage) = CreateDesignerWithMockedHost();
using (designer)
using (tabControl)
using (tabPage)
{
var verbs = designer.Verbs.Cast<DesignerVerb>();
verbs.Should().Contain(v => v.Text == SR.TabControlAdd);
verbs.Should().Contain(v => v.Text == SR.TabControlRemove);
}
}
[Fact]
public void Verbs_RemoveVerbEnabledWhenTabPagesExist()
{
var (designer, tabControl, tabPage) = CreateDesignerWithMockedHost();
using (designer)
using (tabControl)
using (tabPage)
{
tabControl.TabPages.Add(tabPage);
var verbs = designer.Verbs;
var removeVerb = verbs.Cast<DesignerVerb>().FirstOrDefault(v => v.Text == SR.TabControlRemove);
removeVerb.Should().NotBeNull();
removeVerb.Should().BeOfType<DesignerVerb>().Which.Enabled.Should().BeTrue();
}
}
[Fact]
public void Verbs_RemoveVerbDisabledWhenNoTabPagesExist()
{
var (designer, tabControl, tabPage) = CreateDesignerWithMockedHost();
using (designer)
using (tabControl)
using (tabPage)
{
var verbs = designer.Verbs;
var removeVerb = verbs.Cast<DesignerVerb>().FirstOrDefault(v => v.Text == SR.TabControlRemove);
removeVerb.Should().NotBeNull();
removeVerb.Should().BeOfType<DesignerVerb>().Which.Enabled.Should().BeFalse();
}
}
[Fact]
public void ParticipatesWithSnapLines_ReturnsFalseWhenNotForwardOnDrag()
{
var (designer, tabControl, tabPage) = CreateDesignerWithMockedHost();
using (designer)
using (tabControl)
using (tabPage)
{
bool result = designer.ParticipatesWithSnapLines;
result.Should().BeFalse();
}
}
[Fact]
public void ParticipatesWithSnapLines_ReturnsTrueWhenForwardOnDragAndPageDesignerParticipates()
{
var (designer, tabControl, tabPage) = CreateDesignerWithMockedHost();
using (designer)
using (tabControl)
using (tabPage)
{
tabControl.TabPages.Add(tabPage);
Mock<TabPageDesigner> pageDesignerMock = new(MockBehavior.Strict);
pageDesignerMock.Setup(p => p.ParticipatesWithSnapLines).Returns(true);
designer.TestAccessor().Dynamic._forwardOnDrag = true;
bool result = designer.ParticipatesWithSnapLines;
result.Should().BeTrue();
}
}
[Fact]
public void ParticipatesWithSnapLines_ReturnsTrueWhenForwardOnDragAndPageDesignerDoesNotParticipate()
{
var (designer, tabControl, tabPage) = CreateDesignerWithMockedHost();
using (designer)
using (tabControl)
using (tabPage)
{
Mock<TabPageDesigner> pageDesignerMock = new(MockBehavior.Strict);
pageDesignerMock.Setup(p => p.ParticipatesWithSnapLines).Returns(false);
designer.TestAccessor().Dynamic._forwardOnDrag = true;
bool result = designer.ParticipatesWithSnapLines;
result.Should().BeTrue();
}
}
}
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