public void TabPageControlCollection_Ctor_TabPage(TabPage owner)
{
var collection = new TabPage.TabPageControlCollection(owner);
Assert.Empty(collection);
Assert.False(collection.IsReadOnly);
Assert.Same(owner, collection.Owner);
}
public void ControlCollection_Add_TabPageValue_ThrowsArgumentException()
{
using var owner = new TabPage();
using var control = new TabPage();
var collection = new TabPage.TabPageControlCollection(owner);
Assert.Throws <ArgumentException>(null, () => collection.Add(control));
}
public void TabPageControlCollection_Add_ControlExistingCollection_Success()
{
using var owner = new TabPage();
using var control1 = new Control();
using var control2 = new Control();
TabPage.TabPageControlCollection collection = Assert.IsType <TabPage.TabPageControlCollection>(owner.Controls);
int parentLayoutCallCount = 0;
string affectedProperty = null;
void parentHandler(object sender, LayoutEventArgs e)
{
Assert.Same(owner, sender);
Assert.Same(collection.Cast <Control>().Last(), e.AffectedControl);
Assert.Equal(affectedProperty, e.AffectedProperty);
parentLayoutCallCount++;
}
owner.Layout += parentHandler;
int layoutCallCount1 = 0;
control1.Layout += (sender, e) => layoutCallCount1++;
int layoutCallCount2 = 0;
control2.Layout += (sender, e) => layoutCallCount2++;
try
{
affectedProperty = "Parent";
collection.Add(control1);
Assert.Same(control1, Assert.Single(collection));
Assert.Same(owner, control1.Parent);
Assert.Equal(0, control1.TabIndex);
Assert.Same(control1, Assert.Single(owner.Controls));
Assert.Equal(0, layoutCallCount1);
Assert.Equal(1, parentLayoutCallCount);
Assert.False(owner.IsHandleCreated);
Assert.False(control1.IsHandleCreated);
// Add another.
collection.Add(control2);
Assert.Equal(new Control[] { control1, control2 }, collection.Cast <Control>());
Assert.Same(owner, control1.Parent);
Assert.Equal(0, control1.TabIndex);
Assert.Same(owner, control2.Parent);
Assert.Equal(1, control2.TabIndex);
Assert.Equal(new Control[] { control1, control2 }, owner.Controls.Cast <Control>());
Assert.Equal(0, layoutCallCount1);
Assert.Equal(0, layoutCallCount2);
Assert.Equal(2, parentLayoutCallCount);
Assert.False(owner.IsHandleCreated);
Assert.False(control1.IsHandleCreated);
Assert.False(control2.IsHandleCreated);
// Add existing.
affectedProperty = "ChildIndex";
collection.Add(control1);
Assert.Equal(new Control[] { control2, control1 }, collection.Cast <Control>());
Assert.Same(owner, control1.Parent);
Assert.Equal(0, control1.TabIndex);
Assert.Same(owner, control2.Parent);
Assert.Equal(1, control2.TabIndex);
Assert.Equal(new Control[] { control2, control1 }, owner.Controls.Cast <Control>());
Assert.Equal(0, layoutCallCount1);
Assert.Equal(0, layoutCallCount2);
Assert.Equal(3, parentLayoutCallCount);
Assert.False(owner.IsHandleCreated);
Assert.False(control1.IsHandleCreated);
Assert.False(control2.IsHandleCreated);
// Add null.
collection.Add(null);
Assert.Equal(new Control[] { control2, control1 }, collection.Cast <Control>());
}
finally
{
owner.Layout -= parentHandler;
}
}
protected Control.ControlCollection CreateControlsInstance()
{
TabPage.TabPageControlCollection c = new TabPage.TabPageControlCollection((TabPage)Parent);
return((Control.ControlCollection)c);
}