A cross-platform UI framework for .NET
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using System;
using System.Collections.Generic;
using System.Reactive.Linq;
using System.Threading.Tasks;
using Avalonia.Controls.Presenters;
using Avalonia.Controls.Primitives;
using Avalonia.Controls.Templates;
using Avalonia.Data;
using Avalonia.Headless;
using Avalonia.Input;
using Avalonia.Input.Platform;
using Avalonia.Input.TextInput;
using Avalonia.Layout;
using Avalonia.Media;
using Avalonia.Platform;
using Avalonia.UnitTests;
using Avalonia.VisualTree;
using Moq;
using Xunit;
namespace Avalonia.Controls.UnitTests
{
public class TextBoxTests
{
[Fact]
public void Opening_Context_Menu_Does_not_Lose_Selection()
{
using (UnitTestApplication.Start(FocusServices))
{
var target1 = new TextBox
{
Template = CreateTemplate(),
Text = "1234",
ContextMenu = new TestContextMenu()
};
var target2 = new TextBox
{
Template = CreateTemplate(),
Text = "5678"
};
var sp = new StackPanel();
sp.Children.Add(target1);
sp.Children.Add(target2);
target1.ApplyTemplate();
target2.ApplyTemplate();
var root = new TestRoot() { Child = sp };
target1.SelectionStart = 0;
target1.SelectionEnd = 3;
target1.Focus();
Assert.False(target2.IsFocused);
Assert.True(target1.IsFocused);
target2.Focus();
Assert.Equal("123", target1.SelectedText);
}
}
[Fact]
public void TextBox_Should_Lose_Focus_When_Disabled()
{
using (UnitTestApplication.Start(FocusServices))
{
var target = new TextBox
{
Template = CreateTemplate()
};
target.ApplyTemplate();
var root = new TestRoot() { Child = target };
target.Focus();
Assert.True(target.IsFocused);
target.IsEnabled = false;
Assert.False(target.IsFocused);
Assert.False(target.IsEnabled);
}
}
[Fact]
public void Opening_Context_Flyout_Does_not_Lose_Selection()
{
using (UnitTestApplication.Start(FocusServices))
{
var target1 = new TextBox
{
Template = CreateTemplate(),
Text = "1234",
ContextFlyout = new MenuFlyout
{
Items =
{
new MenuItem { Header = "Item 1" },
new MenuItem {Header = "Item 2" },
new MenuItem {Header = "Item 3" }
}
}
};
target1.ApplyTemplate();
var root = new TestRoot() { Child = target1 };
target1.SelectionStart = 0;
target1.SelectionEnd = 3;
target1.Focus();
Assert.True(target1.IsFocused);
target1.ContextFlyout.ShowAt(target1);
Assert.Equal("123", target1.SelectedText);
}
}
[Fact]
public void DefaultBindingMode_Should_Be_TwoWay()
{
Assert.Equal(
BindingMode.TwoWay,
TextBox.TextProperty.GetMetadata(typeof(TextBox)).DefaultBindingMode);
}
[Fact]
public void CaretIndex_Can_Moved_To_Position_After_The_End_Of_Text_With_Arrow_Key()
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate(),
Text = "1234"
};
target.ApplyTemplate();
target.Measure(Size.Infinity);
target.CaretIndex = 3;
RaiseKeyEvent(target, Key.Right, 0);
Assert.Equal(4, target.CaretIndex);
}
}
[Fact]
public void Control_Backspace_Should_Set_Caret_Position_To_The_Start_Of_The_Deletion()
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate(),
Text = "First Second Third",
SelectionStart = 13,
SelectionEnd = 13
};
target.CaretIndex = 10;
target.ApplyTemplate();
// (First Second |Third)
RaiseKeyEvent(target, Key.Back, KeyModifiers.Control);
// (First |Third)
Assert.Equal(6, target.CaretIndex);
}
}
[Fact]
public void Control_Backspace_Should_Remove_The_Double_Whitespace_If_Caret_Index_Was_At_The_End_Of_A_Word()
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate(),
Text = "First Second Third",
SelectionStart = 12,
SelectionEnd = 12
};
target.ApplyTemplate();
// (First Second| Third)
RaiseKeyEvent(target, Key.Back, KeyModifiers.Control);
// (First| Third)
Assert.Equal("First Third", target.Text);
}
}
[Fact]
public void Control_Backspace_Undo_Should_Return_Caret_Position()
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate(),
Text = "First Second Third",
SelectionStart = 9,
SelectionEnd = 9
};
target.ApplyTemplate();
// (First Second| Third)
RaiseKeyEvent(target, Key.Back, KeyModifiers.Control);
// (First| Third)
target.Undo();
// (First Second| Third)
Assert.Equal(9, target.CaretIndex);
}
}
[Fact]
public void Press_Ctrl_A_Select_All_Text()
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate(),
Text = "1234"
};
target.ApplyTemplate();
RaiseKeyEvent(target, Key.A, KeyModifiers.Control);
Assert.Equal(0, target.SelectionStart);
Assert.Equal(4, target.SelectionEnd);
}
}
[Fact]
public void Press_Ctrl_A_Select_All_Null_Text()
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate()
};
RaiseKeyEvent(target, Key.A, KeyModifiers.Control);
Assert.Equal(0, target.SelectionStart);
Assert.Equal(0, target.SelectionEnd);
}
}
[Fact]
public void Press_Ctrl_Z_Will_Not_Modify_Text()
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate(),
Text = "1234"
};
RaiseKeyEvent(target, Key.Z, KeyModifiers.Control);
Assert.Equal("1234", target.Text);
}
}
[Fact]
public void Control_Backspace_Should_Remove_The_Word_Before_The_Caret_If_There_Is_No_Selection()
{
using (UnitTestApplication.Start(Services))
{
TextBox textBox = new TextBox
{
Template = CreateTemplate(),
Text = "First Second Third Fourth",
SelectionStart = 5,
SelectionEnd = 5
};
textBox.ApplyTemplate();
// (First| Second Third Fourth)
RaiseKeyEvent(textBox, Key.Back, KeyModifiers.Control);
Assert.Equal(" Second Third Fourth", textBox.Text);
// ( Second |Third Fourth)
textBox.CaretIndex = 8;
RaiseKeyEvent(textBox, Key.Back, KeyModifiers.Control);
Assert.Equal(" Third Fourth", textBox.Text);
// ( Thi|rd Fourth)
textBox.CaretIndex = 4;
RaiseKeyEvent(textBox, Key.Back, KeyModifiers.Control);
Assert.Equal(" rd Fourth", textBox.Text);
// ( rd F[ou]rth)
textBox.SelectionStart = 5;
textBox.SelectionEnd = 7;
RaiseKeyEvent(textBox, Key.Back, KeyModifiers.Control);
Assert.Equal(" rd Frth", textBox.Text);
// ( |rd Frth)
textBox.CaretIndex = 1;
RaiseKeyEvent(textBox, Key.Back, KeyModifiers.Control);
Assert.Equal("rd Frth", textBox.Text);
}
}
[Fact]
public void Control_Delete_Should_Remove_The_Word_After_The_Caret_If_There_Is_No_Selection()
{
using (UnitTestApplication.Start(Services))
{
TextBox textBox = new TextBox
{
Template = CreateTemplate(),
Text = "First Second Third Fourth",
CaretIndex = 19,
};
textBox.ApplyTemplate();
// (First Second Third |Fourth)
RaiseKeyEvent(textBox, Key.Delete, KeyModifiers.Control);
Assert.Equal("First Second Third ", textBox.Text);
// (First Second |Third )
textBox.CaretIndex = 13;
RaiseKeyEvent(textBox, Key.Delete, KeyModifiers.Control);
Assert.Equal("First Second ", textBox.Text);
// (First Sec|ond )
textBox.CaretIndex = 9;
RaiseKeyEvent(textBox, Key.Delete, KeyModifiers.Control);
Assert.Equal("First Sec", textBox.Text);
// (Fi[rs]t Sec )
textBox.SelectionStart = 2;
textBox.SelectionEnd = 4;
RaiseKeyEvent(textBox, Key.Delete, KeyModifiers.Control);
Assert.Equal("Fit Sec", textBox.Text);
// (Fit Sec| )
textBox.Text += " ";
textBox.CaretIndex = 7;
RaiseKeyEvent(textBox, Key.Delete, KeyModifiers.Control);
Assert.Equal("Fit Sec", textBox.Text);
}
}
[Fact]
public void Setting_SelectionStart_To_SelectionEnd_Sets_CaretPosition_To_SelectionStart()
{
using (UnitTestApplication.Start(Services))
{
var textBox = new TextBox
{
Text = "0123456789"
};
textBox.SelectionStart = 2;
textBox.SelectionEnd = 2;
Assert.Equal(2, textBox.CaretIndex);
}
}
[Fact]
public void Setting_Text_Updates_CaretPosition()
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Text = "Initial Text",
CaretIndex = 11
};
var invoked = false;
target.GetObservable(TextBox.TextProperty).Skip(1).Subscribe(_ =>
{
// Caret index should be set before Text changed notification, as we don't want
// to notify with an invalid CaretIndex.
Assert.Equal(7, target.CaretIndex);
invoked = true;
});
target.Text = "Changed";
Assert.True(invoked);
}
}
[Fact]
public void Press_Enter_Does_Not_Accept_Return()
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate(),
AcceptsReturn = false,
Text = "1234"
};
target.ApplyTemplate();
RaiseKeyEvent(target, Key.Enter, 0);
Assert.Equal("1234", target.Text);
}
}
[Fact]
public void Press_Enter_Add_Default_Newline()
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate(),
AcceptsReturn = true
};
target.ApplyTemplate();
RaiseKeyEvent(target, Key.Enter, 0);
Assert.Equal(Environment.NewLine, target.Text);
}
}
[Fact]
public void Press_Enter_Add_Custom_Newline()
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate(),
AcceptsReturn = true,
NewLine = "Test"
};
target.ApplyTemplate();
RaiseKeyEvent(target, Key.Enter, 0);
Assert.Equal("Test", target.Text);
}
}
[Theory]
[InlineData(new object[] { false, TextWrapping.NoWrap, ScrollBarVisibility.Hidden })]
[InlineData(new object[] { false, TextWrapping.Wrap, ScrollBarVisibility.Disabled })]
[InlineData(new object[] { true, TextWrapping.NoWrap, ScrollBarVisibility.Auto })]
[InlineData(new object[] { true, TextWrapping.Wrap, ScrollBarVisibility.Disabled })]
public void Has_Correct_Horizontal_ScrollBar_Visibility(
bool acceptsReturn,
TextWrapping wrapping,
ScrollBarVisibility expected)
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
AcceptsReturn = acceptsReturn,
TextWrapping = wrapping,
};
Assert.Equal(expected, ScrollViewer.GetHorizontalScrollBarVisibility(target));
}
}
[Fact]
public void SelectionEnd_Doesnt_Cause_Exception()
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate(),
Text = "0123456789"
};
target.ApplyTemplate();
target.SelectionStart = 0;
target.SelectionEnd = 9;
target.Text = "123";
RaiseTextEvent(target, "456");
Assert.True(true);
}
}
[Fact]
public void SelectionStart_Doesnt_Cause_Exception()
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate(),
Text = "0123456789"
};
target.ApplyTemplate();
target.SelectionStart = 8;
target.SelectionEnd = 9;
target.Text = "123";
RaiseTextEvent(target, "456");
Assert.True(true);
}
}
[Fact]
public void SelectionStartEnd_Are_Valid_AterTextChange()
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate(),
Text = "0123456789"
};
target.SelectionStart = 8;
target.SelectionEnd = 9;
target.Text = "123";
Assert.True(target.SelectionStart <= "123".Length);
Assert.True(target.SelectionEnd <= "123".Length);
}
}
[Fact]
public void SelectedText_Changes_OnSelectionChange()
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate(),
Text = "0123456789"
};
target.ApplyTemplate();
Assert.True(target.SelectedText == "");
target.SelectionStart = 2;
target.SelectionEnd = 4;
Assert.True(target.SelectedText == "23");
}
}
[Fact]
public void SelectedText_EditsText()
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate(),
Text = "0123"
};
target.ApplyTemplate();
target.SelectedText = "AA";
Assert.True(target.Text == "AA0123");
target.SelectionStart = 1;
target.SelectionEnd = 3;
target.SelectedText = "BB";
Assert.True(target.Text == "ABB123");
}
}
[Fact]
public void SelectedText_CanClearText()
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate(),
Text = "0123"
};
target.SelectionStart = 1;
target.SelectionEnd = 3;
target.SelectedText = "";
Assert.True(target.Text == "03");
}
}
[Fact]
public void SelectedText_NullClearsText()
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate(),
Text = "0123"
};
target.SelectionStart = 1;
target.SelectionEnd = 3;
target.SelectedText = null;
Assert.True(target.Text == "03");
}
}
[Fact]
public void CoerceCaretIndex_Doesnt_Cause_Exception_with_malformed_line_ending()
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate(),
Text = "0123456789\r"
};
target.CaretIndex = 11;
Assert.True(true);
}
}
[Theory]
[InlineData(Key.Up)]
[InlineData(Key.Down)]
[InlineData(Key.Home)]
[InlineData(Key.End)]
public void Textbox_doesnt_crash_when_Receives_input_and_template_not_applied(Key key)
{
using (UnitTestApplication.Start(FocusServices))
{
var target1 = new TextBox
{
Template = CreateTemplate(),
Text = "1234",
};
var root = new TestRoot { Child = target1 };
target1.Focus();
Assert.True(target1.IsFocused);
RaiseKeyEvent(target1, key, KeyModifiers.None);
}
}
[Fact]
public void TextBox_GotFocus_And_LostFocus_Work_Properly()
{
using (UnitTestApplication.Start(FocusServices))
{
var target1 = new TextBox
{
Template = CreateTemplate(),
Text = "1234"
};
var target2 = new TextBox
{
Template = CreateTemplate(),
Text = "5678"
};
var sp = new StackPanel();
sp.Children.Add(target1);
sp.Children.Add(target2);
target1.ApplyTemplate();
target2.ApplyTemplate();
var root = new TestRoot { Child = sp };
var gfcount = 0;
var lfcount = 0;
target1.GotFocus += (s, e) => gfcount++;
target2.LostFocus += (s, e) => lfcount++;
target2.Focus();
Assert.False(target1.IsFocused);
Assert.True(target2.IsFocused);
target1.Focus();
Assert.False(target2.IsFocused);
Assert.True(target1.IsFocused);
Assert.Equal(1, gfcount);
Assert.Equal(1, lfcount);
}
}
[Fact]
public void TextBox_CaretIndex_Persists_When_Focus_Lost()
{
using (UnitTestApplication.Start(FocusServices))
{
var target1 = new TextBox
{
Template = CreateTemplate(),
Text = "1234"
};
var target2 = new TextBox
{
Template = CreateTemplate(),
Text = "5678"
};
var sp = new StackPanel();
sp.Children.Add(target1);
sp.Children.Add(target2);
target1.ApplyTemplate();
target2.ApplyTemplate();
var root = new TestRoot { Child = sp };
target2.Focus();
target2.CaretIndex = 2;
Assert.False(target1.IsFocused);
Assert.True(target2.IsFocused);
target1.Focus();
Assert.Equal(2, target2.CaretIndex);
}
}
[Fact]
public void TextBox_Reveal_Password_Reset_When_Lost_Focus()
{
using (UnitTestApplication.Start(FocusServices))
{
var target1 = new TextBox
{
Template = CreateTemplate(),
Text = "1234",
PasswordChar = '*'
};
var target2 = new TextBox
{
Template = CreateTemplate(),
Text = "5678"
};
var sp = new StackPanel();
sp.Children.Add(target1);
sp.Children.Add(target2);
target1.ApplyTemplate();
target2.ApplyTemplate();
var root = new TestRoot { Child = sp };
target1.Focus();
target1.RevealPassword = true;
target2.Focus();
Assert.False(target1.RevealPassword);
}
}
[Fact]
public void Setting_Bound_Text_To_Null_Works()
{
using (UnitTestApplication.Start(Services))
{
var source = new Class1 { Bar = "bar" };
var target = new TextBox { Template = CreateTemplate(), DataContext = source };
target.ApplyTemplate();
target.Bind(TextBox.TextProperty, new Binding("Bar"));
Assert.Equal("bar", target.Text);
source.Bar = null;
Assert.Null(target.Text);
}
}
[Theory]
[InlineData("abc", "d", 3, 0, 0, false, "abc")]
[InlineData("abc", "dd", 4, 3, 3, false, "abcd")]
[InlineData("abc", "ddd", 3, 0, 2, true, "ddc")]
[InlineData("abc", "dddd", 4, 1, 3, true, "addd")]
[InlineData("abc", "ddddd", 5, 3, 3, true, "abcdd")]
public void MaxLength_Works_Properly(
string initalText,
string textInput,
int maxLength,
int selectionStart,
int selectionEnd,
bool fromClipboard,
string expected)
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate(),
Text = initalText,
MaxLength = maxLength,
SelectionStart = selectionStart,
SelectionEnd = selectionEnd
};
var impl = CreateMockTopLevelImpl();
var topLevel = new TestTopLevel(impl.Object)
{
Template = CreateTopLevelTemplate()
};
topLevel.Content = target;
topLevel.ApplyTemplate();
topLevel.LayoutManager.ExecuteInitialLayoutPass();
target.Measure(Size.Infinity);
if (fromClipboard)
{
topLevel.Clipboard?.SetTextAsync(textInput).GetAwaiter().GetResult();
RaiseKeyEvent(target, Key.V, KeyModifiers.Control);
topLevel.Clipboard?.ClearAsync().GetAwaiter().GetResult();
}
else
{
RaiseTextEvent(target, textInput);
}
Assert.Equal(expected, target.Text);
}
}
[Theory]
[InlineData(Key.X, KeyModifiers.Control)]
[InlineData(Key.Back, KeyModifiers.None)]
[InlineData(Key.Delete, KeyModifiers.None)]
[InlineData(Key.Tab, KeyModifiers.None)]
[InlineData(Key.Enter, KeyModifiers.None)]
public void Keys_Allow_Undo(Key key, KeyModifiers modifiers)
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate(),
Text = "0123",
AcceptsReturn = true,
AcceptsTab = true
};
var impl = CreateMockTopLevelImpl();
var topLevel = new TestTopLevel(impl.Object)
{
Template = CreateTopLevelTemplate()
};
topLevel.Content = target;
topLevel.ApplyTemplate();
topLevel.LayoutManager.ExecuteInitialLayoutPass();
target.ApplyTemplate();
target.SelectionStart = 1;
target.SelectionEnd = 3;
RaiseKeyEvent(target, key, modifiers);
RaiseKeyEvent(target, Key.Z, KeyModifiers.Control); // undo
Assert.True(target.Text == "0123");
}
}
[Fact]
public void Setting_SelectedText_Should_Fire_Single_Text_Changed_Notification()
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate(),
Text = "0123",
AcceptsReturn = true,
AcceptsTab = true,
SelectionStart = 1,
SelectionEnd = 3,
};
var values = new List<string>();
target.GetObservable(TextBox.TextProperty).Subscribe(x => values.Add(x));
target.SelectedText = "A";
Assert.Equal(new[] { "0123", "0A3" }, values);
}
}
[Fact]
public void Entering_Text_With_SelectedText_Should_Fire_Single_Text_Changed_Notification()
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate(),
Text = "0123",
AcceptsReturn = true,
AcceptsTab = true,
SelectionStart = 1,
SelectionEnd = 3,
};
var values = new List<string>();
target.GetObservable(TextBox.TextProperty).Subscribe(x => values.Add(x));
RaiseTextEvent(target, "A");
Assert.Equal(new[] { "0123", "0A3" }, values);
}
}
[Fact]
public void Insert_Multiline_Text_Should_Accept_Extra_Lines_When_AcceptsReturn_Is_True()
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
AcceptsReturn = true
};
RaiseTextEvent(target, $"123 {Environment.NewLine}456");
Assert.Equal($"123 {Environment.NewLine}456", target.Text);
}
}
[Fact]
public void Insert_Multiline_Text_Should_Discard_Extra_Lines_When_AcceptsReturn_Is_False()
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
AcceptsReturn = false
};
RaiseTextEvent(target, $"123 {"\r"}456");
Assert.Equal("123 ", target.Text);
target.Text = "";
RaiseTextEvent(target, $"123 {"\r\n"}456");
Assert.Equal("123 ", target.Text);
}
}
[Fact]
public void Should_Fullfill_MaxLines_Contraint()
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate(),
Text = "ABC",
MaxLines = 1,
AcceptsReturn = true
};
var impl = CreateMockTopLevelImpl();
var topLevel = new TestTopLevel(impl.Object)
{
Template = CreateTopLevelTemplate()
};
topLevel.Content = target;
topLevel.ApplyTemplate();
topLevel.LayoutManager.ExecuteInitialLayoutPass();
target.ApplyTemplate();
target.Measure(Size.Infinity);
var initialHeight = target.DesiredSize.Height;
topLevel.Clipboard?.SetTextAsync(Environment.NewLine).GetAwaiter().GetResult();
RaiseKeyEvent(target, Key.V, KeyModifiers.Control);
topLevel.Clipboard?.ClearAsync().GetAwaiter().GetResult();
RaiseTextEvent(target, Environment.NewLine);
target.InvalidateMeasure();
target.Measure(Size.Infinity);
Assert.Equal(initialHeight, target.DesiredSize.Height);
}
}
[Theory]
[InlineData(1)]
[InlineData(2)]
[InlineData(3)]
public void MaxLines_Sets_ScrollViewer_MaxHeight(int maxLines)
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate(),
MaxLines = maxLines,
// Define explicit whole number line height for predictable calculations
LineHeight = 20
};
var impl = CreateMockTopLevelImpl();
var topLevel = new TestTopLevel(impl.Object)
{
Template = CreateTopLevelTemplate(),
Content = target
};
topLevel.ApplyTemplate();
topLevel.LayoutManager.ExecuteInitialLayoutPass();
var textPresenter = target.FindDescendantOfType<TextPresenter>();
Assert.Equal("PART_TextPresenter", textPresenter.Name);
Assert.Equal(new Thickness(0), textPresenter.Margin); // Test assumes no margin on TextPresenter
var scrollViewer = target.FindDescendantOfType<ScrollViewer>();
Assert.Equal("PART_ScrollViewer", scrollViewer.Name);
Assert.Equal(maxLines * target.LineHeight, scrollViewer.MaxHeight);
}
}
[Theory]
[InlineData(1)]
[InlineData(2)]
[InlineData(3)]
public void MaxLines_Sets_ScrollViewer_MaxHeight_With_TextPresenter_Margin(int maxLines)
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate(),
MaxLines = maxLines,
// Define explicit whole number line height for predictable calculations
LineHeight = 20
};
var impl = CreateMockTopLevelImpl();
var topLevel = new TestTopLevel(impl.Object)
{
Template = CreateTopLevelTemplate(),
Content = target
};
topLevel.ApplyTemplate();
topLevel.LayoutManager.ExecuteInitialLayoutPass();
var textPresenter = target.FindDescendantOfType<TextPresenter>();
Assert.Equal("PART_TextPresenter", textPresenter.Name);
var textPresenterMargin = new Thickness(horizontal: 0, vertical: 3);
textPresenter.Margin = textPresenterMargin;
target.InvalidateMeasure();
target.Measure(Size.Infinity);
var scrollViewer = target.FindDescendantOfType<ScrollViewer>();
Assert.Equal("PART_ScrollViewer", scrollViewer.Name);
Assert.Equal((maxLines * target.LineHeight) + textPresenterMargin.Top + textPresenterMargin.Bottom, scrollViewer.MaxHeight);
}
}
[Fact]
public void Should_Fullfill_MinLines_Contraint()
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate(),
Text = "ABC \n DEF \n GHI",
MinLines = 3,
AcceptsReturn = true
};
var impl = CreateMockTopLevelImpl();
var topLevel = new TestTopLevel(impl.Object)
{
Template = CreateTopLevelTemplate()
};
topLevel.Content = target;
topLevel.ApplyTemplate();
topLevel.LayoutManager.ExecuteInitialLayoutPass();
target.ApplyTemplate();
target.Measure(Size.Infinity);
var initialHeight = target.DesiredSize.Height;
target.Text = "";
target.InvalidateMeasure();
target.Measure(Size.Infinity);
Assert.Equal(initialHeight, target.DesiredSize.Height);
}
}
[Theory]
[InlineData(1)]
[InlineData(2)]
[InlineData(3)]
public void MinLines_Sets_ScrollViewer_MinHeight(int minLines)
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate(),
MinLines = minLines,
// Define explicit whole number line height for predictable calculations
LineHeight = 20
};
var impl = CreateMockTopLevelImpl();
var topLevel = new TestTopLevel(impl.Object)
{
Template = CreateTopLevelTemplate(),
Content = target
};
topLevel.ApplyTemplate();
topLevel.LayoutManager.ExecuteInitialLayoutPass();
var textPresenter = target.FindDescendantOfType<TextPresenter>();
Assert.Equal("PART_TextPresenter", textPresenter.Name);
Assert.Equal(new Thickness(0), textPresenter.Margin); // Test assumes no margin on TextPresenter
var scrollViewer = target.FindDescendantOfType<ScrollViewer>();
Assert.Equal("PART_ScrollViewer", scrollViewer.Name);
Assert.Equal(minLines * target.LineHeight, scrollViewer.MinHeight);
}
}
[Theory]
[InlineData(1)]
[InlineData(2)]
[InlineData(3)]
public void MinLines_Sets_ScrollViewer_MinHeight_With_TextPresenter_Margin(int minLines)
{
using (UnitTestApplication.Start(Services))
{
var target = new TextBox
{
Template = CreateTemplate(),
MinLines = minLines,
// Define explicit whole number line height for predictable calculations
LineHeight = 20
};
var impl = CreateMockTopLevelImpl();
var topLevel = new TestTopLevel(impl.Object)
{
Template = CreateTopLevelTemplate(),
Content = target
};
topLevel.ApplyTemplate();
topLevel.LayoutManager.ExecuteInitialLayoutPass();
var textPresenter = target.FindDescendantOfType<TextPresenter>();
Assert.Equal("PART_TextPresenter", textPresenter.Name);
var textPresenterMargin = new Thickness(horizontal: 0, vertical: 3);
textPresenter.Margin = textPresenterMargin;
target.InvalidateMeasure();
target.Measure(Size.Infinity);
var scrollViewer = target.FindDescendantOfType<ScrollViewer>();
Assert.Equal("PART_ScrollViewer", scrollViewer.Name);
Assert.Equal((minLines * target.LineHeight) + textPresenterMargin.Top + textPresenterMargin.Bottom, scrollViewer.MinHeight);
}
}
[Fact]
public void CanUndo_CanRedo_Is_False_When_Initialized()
{
using (UnitTestApplication.Start(Services))
{
var tb = new TextBox
{
Template = CreateTemplate(),
Text = "New Text"
};
tb.Measure(Size.Infinity);
Assert.False(tb.CanUndo);
Assert.False(tb.CanRedo);
}
}
[Fact]
public void CanUndo_CanRedo_and_Programmatic_Undo_Redo_Works()
{
using (UnitTestApplication.Start(Services))
{
var tb = new TextBox
{
Template = CreateTemplate(),
};
tb.Measure(Size.Infinity);
// See GH #6024 for a bit more insight on when Undo/Redo snapshots are taken:
// - Every 'Space', but only when space is handled in OnKeyDown - Spaces in TextInput event won't work
// - Every 7 chars in a long word
RaiseTextEvent(tb, "ABC");
RaiseKeyEvent(tb, Key.Space, KeyModifiers.None);
RaiseTextEvent(tb, "DEF");
RaiseKeyEvent(tb, Key.Space, KeyModifiers.None);
RaiseTextEvent(tb, "123");
// NOTE: the spaces won't actually add spaces b/c they're sent only as key events and not Text events
// so our final text is without spaces
Assert.Equal("ABCDEF123", tb.Text);
Assert.True(tb.CanUndo);
tb.Undo();
// Undo will take us back one step
Assert.Equal("ABCDEF", tb.Text);
Assert.True(tb.CanRedo);
tb.Redo();
// Redo should restore us
Assert.Equal("ABCDEF123", tb.Text);
}
}
[Fact]
public void Setting_UndoLimit_Clears_Undo_Redo()
{
using (UnitTestApplication.Start(Services))
{
var tb = new TextBox
{
Template = CreateTemplate(),
};
tb.Measure(Size.Infinity);
// This is all the same as the above test (CanUndo_CanRedo_and_Programmatic_Undo_Redo_Works)
// We do this to get the undo/redo stacks in a state where both are active
RaiseTextEvent(tb, "ABC");
RaiseKeyEvent(tb, Key.Space, KeyModifiers.None);
RaiseTextEvent(tb, "DEF");
RaiseKeyEvent(tb, Key.Space, KeyModifiers.None);
RaiseTextEvent(tb, "123");
Assert.Equal("ABCDEF123", tb.Text);
Assert.True(tb.CanUndo);
tb.Undo();
// Undo will take us back one step
Assert.Equal("ABCDEF", tb.Text);
Assert.True(tb.CanRedo);
tb.Redo();
// Redo should restore us
Assert.Equal("ABCDEF123", tb.Text);
// Change the undo limit, this should clear both stacks setting CanUndo and CanRedo to false
tb.UndoLimit = 1;
Assert.False(tb.CanUndo);
Assert.False(tb.CanRedo);
}
}
[Fact]
public void Setting_IsUndoEnabled_To_False_Clears_Undo_Redo()
{
using (UnitTestApplication.Start(Services))
{
var tb = new TextBox
{
Template = CreateTemplate(),
};
tb.Measure(Size.Infinity);
// This is all the same as the above test (CanUndo_CanRedo_and_Programmatic_Undo_Redo_Works)
// We do this to get the undo/redo stacks in a state where both are active
RaiseTextEvent(tb, "ABC");
RaiseKeyEvent(tb, Key.Space, KeyModifiers.None);
RaiseTextEvent(tb, "DEF");
RaiseKeyEvent(tb, Key.Space, KeyModifiers.None);
RaiseTextEvent(tb, "123");
Assert.Equal("ABCDEF123", tb.Text);
Assert.True(tb.CanUndo);
tb.Undo();
// Undo will take us back one step
Assert.Equal("ABCDEF", tb.Text);
Assert.True(tb.CanRedo);
tb.Redo();
// Redo should restore us
Assert.Equal("ABCDEF123", tb.Text);
// Disable Undo/Redo, this should clear both stacks setting CanUndo and CanRedo to false
tb.IsUndoEnabled = false;
Assert.False(tb.CanUndo);
Assert.False(tb.CanRedo);
}
}
[Fact]
public void UndoLimit_Count_Is_Respected()
{
using (UnitTestApplication.Start(Services))
{
var tb = new TextBox
{
Template = CreateTemplate(),
UndoLimit = 3 // Something small for this test
};
tb.Measure(Size.Infinity);
// Push 3 undoable actions, we should only be able to recover 2
RaiseTextEvent(tb, "ABC");
RaiseKeyEvent(tb, Key.Space, KeyModifiers.None);
RaiseTextEvent(tb, "DEF");
RaiseKeyEvent(tb, Key.Space, KeyModifiers.None);
RaiseTextEvent(tb, "123");
Assert.Equal("ABCDEF123", tb.Text);
// Undo will take us back one step
tb.Undo();
Assert.Equal("ABCDEF", tb.Text);
// Undo again
tb.Undo();
Assert.Equal("ABC", tb.Text);
// We now should not be able to undo again
Assert.False(tb.CanUndo);
}
}
[Fact]
public void Should_Move_Caret_To_EndOfLine()
{
using (UnitTestApplication.Start(Services))
{
var tb = new TextBox
{
Template = CreateTemplate(),
Text = "AB\nAB"
};
tb.Measure(Size.Infinity);
RaiseKeyEvent(tb, Key.End, KeyModifiers.Shift);
Assert.Equal(2, tb.CaretIndex);
}
}
[Fact]
public void TextBox_In_AdornerLayer_Will_Not_Cause_Collection_Modified_In_VisualLayerManager_Measure()
{
using (UnitTestApplication.Start(Services))
{
var button = new Button();
var root = new TestRoot()
{
Child = new VisualLayerManager()
{
Child = button
}
};
var adorner = new TextBox { Template = CreateTemplate(), Text = "a" };
var adornerLayer = AdornerLayer.GetAdornerLayer(button);
adornerLayer.Children.Add(adorner);
AdornerLayer.SetAdornedElement(adorner, button);
root.Measure(Size.Infinity);
}
}
[Fact]
public void TextBox_In_AdornerLayer_Will_Not_Cause_Collection_Modified_In_VisualLayerManager_Arrange()
{
using (UnitTestApplication.Start(Services))
{
var button = new Button();
var visualLayerManager = new VisualLayerManager() { Child = button };
var root = new TestRoot()
{
Child = visualLayerManager
};
var adorner = new TextBox { Template = CreateTemplate(), Text = "a" };
var adornerLayer = AdornerLayer.GetAdornerLayer(button);
root.Measure(new Size(10, 10));
adornerLayer.Children.Add(adorner);
AdornerLayer.SetAdornedElement(adorner, button);
root.Arrange(new Rect(0, 0, 10, 10));
}
}
[Theory]
[InlineData("A\nBB\nCCC\nDDDD", 0, 0)]
[InlineData("A\nBB\nCCC\nDDDD", 1, 2)]
[InlineData("A\nBB\nCCC\nDDDD", 2, 5)]
[InlineData("A\nBB\nCCC\nDDDD", 3, 9)]
[InlineData("واحد\nاثنين\nثلاثة\nأربعة", 0, 0)]
[InlineData("واحد\nاثنين\nثلاثة\nأربعة", 1, 5)]
[InlineData("واحد\nاثنين\nثلاثة\nأربعة", 2, 11)]
[InlineData("واحد\nاثنين\nثلاثة\nأربعة", 3, 17)]
public void Should_Scroll_Caret_To_Line(string text, int targetLineIndex, int expectedCaretIndex)
{
using (UnitTestApplication.Start(Services))
{
var tb = new TextBox
{
Template = CreateTemplate(),
Text = text
};
tb.ApplyTemplate();
tb.ScrollToLine(targetLineIndex);
Assert.Equal(expectedCaretIndex, tb.CaretIndex);
}
}
[Fact]
public void Should_Throw_ArgumentOutOfRange()
{
using (UnitTestApplication.Start(Services))
{
var tb = new TextBox
{
Template = CreateTemplate(),
Text = string.Empty
};
tb.ApplyTemplate();
Assert.Throws<ArgumentOutOfRangeException>(() => tb.ScrollToLine(-1));
Assert.Throws<ArgumentOutOfRangeException>(() => tb.ScrollToLine(1));
}
}
[Fact]
public void InputMethodClient_SurroundingText_Returns_Empty_For_Empty_Line()
{
using var _ = UnitTestApplication.Start(Services);
var textBox = new TextBox
{
Template = CreateTemplate(),
Text = "",
CaretIndex = 0
};
textBox.ApplyTemplate();
var eventArgs = new TextInputMethodClientRequestedEventArgs
{
RoutedEvent = InputElement.TextInputMethodClientRequestedEvent
};
textBox.RaiseEvent(eventArgs);
var client = eventArgs.Client;
Assert.NotNull(client);
Assert.Equal(string.Empty, client.SurroundingText);
}
[Fact]
public void Backspace_Should_Delete_Last_Character_In_Line_And_Keep_Caret_On_Same_Line()
{
using var _ = UnitTestApplication.Start(Services);
var textBox = new TextBox
{
Template = CreateTemplate(),
Text = "a\nb",
CaretIndex = 3
};
textBox.ApplyTemplate();
var topLevel = new TestTopLevel(CreateMockTopLevelImpl().Object)
{
Template = CreateTopLevelTemplate(),
Content = textBox
};
topLevel.ApplyTemplate();
topLevel.LayoutManager.ExecuteInitialLayoutPass();
var textPresenter = textBox.FindDescendantOfType<TextPresenter>();
Assert.NotNull(textPresenter);
var oldCaretY = textPresenter.GetCursorRectangle().Top;
Assert.NotEqual(0, oldCaretY);
RaiseKeyEvent(textBox, Key.Back, KeyModifiers.None);
Assert.Equal("a\n", textBox.Text);
Assert.Equal(2, textBox.CaretIndex);
Assert.Equal(2, textPresenter.CaretIndex);
var caretY = textPresenter.GetCursorRectangle().Top;
Assert.Equal(oldCaretY, caretY);
}
[Fact]
public void Losing_Focus_Should_Not_Reset_Selection()
{
using (UnitTestApplication.Start(FocusServices))
{
var target1 = new TextBox
{
Template = CreateTemplate(),
Text = "1234",
ClearSelectionOnLostFocus = false
};
target1.ApplyTemplate();
var target2 = new TextBox
{
Template = CreateTemplate(),
};
target2.ApplyTemplate();
var sp = new StackPanel();
sp.Children.Add(target1);
sp.Children.Add(target2);
var root = new TestRoot() { Child = sp };
target1.SelectionStart = 0;
target1.SelectionEnd = 4;
target1.Focus();
Assert.True(target1.IsFocused);
Assert.Equal("1234", target1.SelectedText);
target2.Focus();
Assert.Equal("1234", target1.SelectedText);
}
}
private static TestServices FocusServices => TestServices.MockThreadingInterface.With(
focusManager: new FocusManager(),
keyboardDevice: () => new KeyboardDevice(),
keyboardNavigation: () => new KeyboardNavigationHandler(),
inputManager: new InputManager(),
standardCursorFactory: Mock.Of<ICursorFactory>(),
textShaperImpl: new HeadlessTextShaperStub(),
fontManagerImpl: new HeadlessFontManagerStub());
private static TestServices Services => TestServices.MockThreadingInterface.With(
standardCursorFactory: Mock.Of<ICursorFactory>(),
renderInterface: new HeadlessPlatformRenderInterface(),
textShaperImpl: new HeadlessTextShaperStub(),
fontManagerImpl: new HeadlessFontManagerStub());
internal static IControlTemplate CreateTemplate()
{
return new FuncControlTemplate<TextBox>((control, scope) =>
new ScrollViewer
{
Name = "PART_ScrollViewer",
Template = new FuncControlTemplate<ScrollViewer>(ScrollViewerTests.CreateTemplate),
Content = new TextPresenter
{
Name = "PART_TextPresenter",
[!!TextPresenter.TextProperty] = new Binding
{
Path = nameof(TextPresenter.Text),
Mode = BindingMode.TwoWay,
Priority = BindingPriority.Template,
RelativeSource = new RelativeSource(RelativeSourceMode.TemplatedParent),
},
[!!TextPresenter.CaretIndexProperty] = new Binding
{
Path = nameof(TextPresenter.CaretIndex),
Mode = BindingMode.TwoWay,
Priority = BindingPriority.Template,
RelativeSource = new RelativeSource(RelativeSourceMode.TemplatedParent),
}
}.RegisterInNameScope(scope)
}.RegisterInNameScope(scope));
}
private static void RaiseKeyEvent(TextBox textBox, Key key, KeyModifiers inputModifiers)
{
textBox.RaiseEvent(new KeyEventArgs
{
RoutedEvent = InputElement.KeyDownEvent,
KeyModifiers = inputModifiers,
Key = key
});
}
private static void RaiseTextEvent(TextBox textBox, string text)
{
textBox.RaiseEvent(new TextInputEventArgs
{
RoutedEvent = InputElement.TextInputEvent,
Text = text
});
}
private class Class1 : NotifyingBase
{
private int _foo;
private string _bar;
public int Foo
{
get { return _foo; }
set { _foo = value; RaisePropertyChanged(); }
}
public string Bar
{
get { return _bar; }
set { _bar = value; RaisePropertyChanged(); }
}
}
private class ClipboardStub : IClipboard // in order to get tests working that use the clipboard
{
private string _text;
public Task<string> GetTextAsync() => Task.FromResult(_text);
public Task SetTextAsync(string text)
{
_text = text;
return Task.CompletedTask;
}
public Task ClearAsync()
{
_text = null;
return Task.CompletedTask;
}
public Task SetDataObjectAsync(IDataObject data) => Task.CompletedTask;
public Task<string[]> GetFormatsAsync() => Task.FromResult(Array.Empty<string>());
public Task<object> GetDataAsync(string format) => Task.FromResult((object)null);
}
private class TestTopLevel : TopLevel
{
private readonly ILayoutManager _layoutManager;
public TestTopLevel(ITopLevelImpl impl, ILayoutManager layoutManager = null)
: base(impl)
{
_layoutManager = layoutManager ?? new LayoutManager(this);
}
private protected override ILayoutManager CreateLayoutManager() => _layoutManager;
}
private static Mock<ITopLevelImpl> CreateMockTopLevelImpl()
{
var clipboard = new Mock<ITopLevelImpl>();
clipboard.Setup(x => x.Compositor).Returns(RendererMocks.CreateDummyCompositor());
clipboard.Setup(r => r.TryGetFeature(typeof(IClipboard)))
.Returns(new ClipboardStub());
clipboard.SetupGet(x => x.RenderScaling).Returns(1);
return clipboard;
}
private static FuncControlTemplate<TestTopLevel> CreateTopLevelTemplate()
{
return new FuncControlTemplate<TestTopLevel>((x, scope) =>
new ContentPresenter
{
Name = "PART_ContentPresenter",
[!ContentPresenter.ContentProperty] = x[!ContentControl.ContentProperty],
}.RegisterInNameScope(scope));
}
private class TestContextMenu : ContextMenu
{
public TestContextMenu()
{
IsOpen = true;
}
}
}
}