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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.ComponentModel;
using System.Drawing;
using Point = System.Drawing.Point;
using Size = System.Drawing.Size;
namespace System.Windows.Forms.Tests;
public class FlowLayoutPanelTests
{
[WinFormsFact]
public void FlowLayoutPanel_Ctor_Default()
{
using SubFlowLayoutPanel control = new();
Assert.Null(control.AccessibleDefaultActionDescription);
Assert.Null(control.AccessibleDescription);
Assert.Null(control.AccessibleName);
Assert.Equal(AccessibleRole.Default, control.AccessibleRole);
Assert.False(control.AllowDrop);
Assert.Equal(AnchorStyles.Top | AnchorStyles.Left, control.Anchor);
Assert.False(control.AutoScroll);
Assert.Equal(Size.Empty, control.AutoScrollMargin);
Assert.Equal(Size.Empty, control.AutoScrollMinSize);
Assert.Equal(Point.Empty, control.AutoScrollPosition);
Assert.False(control.AutoSize);
Assert.Equal(AutoSizeMode.GrowOnly, control.AutoSizeMode);
Assert.Equal(Control.DefaultBackColor, control.BackColor);
Assert.Null(control.BackgroundImage);
Assert.Equal(ImageLayout.Tile, control.BackgroundImageLayout);
Assert.Null(control.BindingContext);
Assert.Equal(BorderStyle.None, control.BorderStyle);
Assert.Equal(100, control.Bottom);
Assert.Equal(new Rectangle(0, 0, 200, 100), control.Bounds);
Assert.True(control.CanEnableIme);
Assert.False(control.CanFocus);
Assert.True(control.CanRaiseEvents);
Assert.False(control.CanSelect);
Assert.False(control.Capture);
Assert.True(control.CausesValidation);
Assert.Equal(new Rectangle(0, 0, 200, 100), control.ClientRectangle);
Assert.Equal(new Size(200, 100), control.ClientSize);
Assert.False(control.Created);
Assert.Null(control.Container);
Assert.False(control.ContainsFocus);
Assert.Null(control.ContextMenuStrip);
Assert.Empty(control.Controls);
Assert.Same(control.Controls, control.Controls);
Assert.Same(Cursors.Default, control.Cursor);
Assert.Same(Cursors.Default, control.DefaultCursor);
Assert.Equal(ImeMode.Inherit, control.DefaultImeMode);
Assert.Equal(new Padding(3), control.DefaultMargin);
Assert.Equal(Size.Empty, control.DefaultMaximumSize);
Assert.Equal(Size.Empty, control.DefaultMinimumSize);
Assert.Equal(Padding.Empty, control.DefaultPadding);
Assert.Equal(new Size(200, 100), control.DefaultSize);
Assert.False(control.DesignMode);
Assert.Equal(new Rectangle(0, 0, 200, 100), control.DisplayRectangle);
Assert.Equal(DockStyle.None, control.Dock);
Assert.NotNull(control.DockPadding);
Assert.Same(control.DockPadding, control.DockPadding);
Assert.Equal(0, control.DockPadding.Top);
Assert.Equal(0, control.DockPadding.Bottom);
Assert.Equal(0, control.DockPadding.Left);
Assert.Equal(0, control.DockPadding.Right);
Assert.False(control.DoubleBuffered);
Assert.True(control.Enabled);
Assert.NotNull(control.Events);
Assert.Same(control.Events, control.Events);
Assert.Equal(FlowDirection.LeftToRight, control.FlowDirection);
Assert.False(control.Focused);
Assert.Equal(Control.DefaultFont, control.Font);
Assert.Equal(control.Font.Height, control.FontHeight);
Assert.Equal(Control.DefaultForeColor, control.ForeColor);
Assert.False(control.HasChildren);
Assert.Equal(100, control.Height);
Assert.NotNull(control.HorizontalScroll);
Assert.Same(control.HorizontalScroll, control.HorizontalScroll);
Assert.False(control.HScroll);
Assert.Equal(ImeMode.NoControl, control.ImeMode);
Assert.Equal(ImeMode.NoControl, control.ImeModeBase);
Assert.False(control.IsAccessible);
Assert.False(control.IsMirrored);
Assert.NotNull(control.LayoutEngine);
Assert.Same(control.LayoutEngine, control.LayoutEngine);
Assert.Equal(0, control.Left);
Assert.Equal(Point.Empty, control.Location);
Assert.Equal(new Padding(3), control.Margin);
Assert.Equal(Size.Empty, control.MaximumSize);
Assert.Equal(Size.Empty, control.MinimumSize);
Assert.Equal(Padding.Empty, control.Padding);
Assert.Null(control.Parent);
Assert.Equal(Size.Empty, control.PreferredSize);
Assert.Equal("Microsoft\u00AE .NET", control.ProductName);
Assert.False(control.RecreatingHandle);
Assert.Null(control.Region);
Assert.False(control.ResizeRedraw);
Assert.Equal(200, control.Right);
Assert.Equal(RightToLeft.No, control.RightToLeft);
Assert.True(control.ShowFocusCues);
Assert.True(control.ShowKeyboardCues);
Assert.Null(control.Site);
Assert.Equal(new Size(200, 100), control.Size);
Assert.Equal(0, control.TabIndex);
Assert.False(control.TabStop);
Assert.Empty(control.Text);
Assert.Equal(0, control.Top);
Assert.Null(control.TopLevelControl);
Assert.False(control.UseWaitCursor);
Assert.NotNull(control.VerticalScroll);
Assert.Same(control.VerticalScroll, control.VerticalScroll);
Assert.True(control.Visible);
Assert.False(control.VScroll);
Assert.Equal(200, control.Width);
Assert.True(control.WrapContents);
Assert.False(control.IsHandleCreated);
}
[WinFormsFact]
public void FlowLayoutPanel_CreateParams_GetDefault_ReturnsExpected()
{
using SubFlowLayoutPanel control = new();
CreateParams createParams = control.CreateParams;
Assert.Null(createParams.Caption);
Assert.Null(createParams.ClassName);
Assert.Equal(0x8, createParams.ClassStyle);
Assert.Equal(0x10000, createParams.ExStyle);
Assert.Equal(100, createParams.Height);
Assert.Equal(IntPtr.Zero, createParams.Parent);
Assert.Null(createParams.Param);
Assert.Equal(0x56000000, createParams.Style);
Assert.Equal(200, createParams.Width);
Assert.Equal(0, createParams.X);
Assert.Equal(0, createParams.Y);
Assert.Same(createParams, control.CreateParams);
Assert.False(control.IsHandleCreated);
}
[WinFormsTheory]
[InlineData(FlowDirection.BottomUp, 1)]
[InlineData(FlowDirection.LeftToRight, 1)]
[InlineData(FlowDirection.RightToLeft, 1)]
[InlineData(FlowDirection.TopDown, 1)]
public void FlowLayoutPanel_FlowDirection_Set_GetReturnsExpected(FlowDirection value, int expectedLayoutCallCount)
{
using FlowLayoutPanel control = new();
int layoutCallCount = 0;
control.Layout += (sender, e) =>
{
Assert.Same(control, sender);
Assert.Same(control, e.AffectedControl);
Assert.Equal("FlowDirection", e.AffectedProperty);
layoutCallCount++;
};
control.FlowDirection = value;
Assert.Equal(value, control.FlowDirection);
Assert.Equal(expectedLayoutCallCount, layoutCallCount);
Assert.False(control.IsHandleCreated);
// Set same
control.FlowDirection = value;
Assert.Equal(value, control.FlowDirection);
Assert.Equal(expectedLayoutCallCount * 2, layoutCallCount);
Assert.False(control.IsHandleCreated);
}
[WinFormsTheory]
[InvalidEnumData<FlowDirection>]
public void FlowLayoutPanel_FlowDirection_SetInvalidValue_ThrowsInvalidEnumArgumentException(FlowDirection value)
{
using FlowLayoutPanel control = new();
Assert.Throws<InvalidEnumArgumentException>("value", () => control.FlowDirection = value);
}
[WinFormsTheory]
[InlineData(true, 1)]
[InlineData(false, 1)]
public void FlowLayoutPanel_WrapContents_Set_GetReturnsExpected(bool value, int expectedLayoutCallCount)
{
using FlowLayoutPanel control = new();
int layoutCallCount = 0;
control.Layout += (sender, e) =>
{
Assert.Same(control, sender);
Assert.Same(control, e.AffectedControl);
Assert.Equal("WrapContents", e.AffectedProperty);
layoutCallCount++;
};
control.WrapContents = value;
Assert.Equal(value, control.WrapContents);
Assert.Equal(expectedLayoutCallCount, layoutCallCount);
Assert.False(control.IsHandleCreated);
// Set same
control.WrapContents = value;
Assert.Equal(value, control.WrapContents);
Assert.Equal(expectedLayoutCallCount + 1, layoutCallCount);
Assert.False(control.IsHandleCreated);
// Set different
control.WrapContents = !value;
Assert.Equal(!value, control.WrapContents);
Assert.Equal(expectedLayoutCallCount + 1 + 1, layoutCallCount);
Assert.False(control.IsHandleCreated);
}
[WinFormsFact]
public void FlowLayoutPanel_CanExtend_InvokeWithParent_ReturnsTrue()
{
using FlowLayoutPanel control = new();
using Control extendee = new()
{
Parent = control
};
IExtenderProvider extenderProvider = control;
Assert.True(extenderProvider.CanExtend(extendee));
}
public static IEnumerable<object[]> CanExtend_TestData()
{
yield return new object[] { null };
yield return new object[] { new() };
yield return new object[] { new Control() };
yield return new object[] { new Control { Parent = new() } };
}
[WinFormsTheory]
[MemberData(nameof(CanExtend_TestData))]
public void FlowLayoutPanel_CanExtend_InvokeNoParent_ReturnsFalse(object extendee)
{
using FlowLayoutPanel control = new();
IExtenderProvider extenderProvider = control;
Assert.False(extenderProvider.CanExtend(extendee));
}
[WinFormsFact]
public void FlowLayoutPanel_GetAutoSizeMode_Invoke_ReturnsExpected()
{
using SubFlowLayoutPanel control = new();
Assert.Equal(AutoSizeMode.GrowOnly, control.GetAutoSizeMode());
}
[WinFormsFact]
public void FlowLayoutPanel_GetFlowBreak_InvokeValidControl_ReturnsExpected()
{
using Control child = new();
using FlowLayoutPanel control = new();
Assert.False(control.GetFlowBreak(child));
}
[WinFormsFact]
public void FlowLayoutPanel_GetFlowBreak_NullControl_ThrowsArgumentNullException()
{
using FlowLayoutPanel control = new();
Assert.Throws<ArgumentNullException>("control", () => control.GetFlowBreak(null));
}
[WinFormsTheory]
[InlineData(0, true)]
[InlineData(SubFlowLayoutPanel.ScrollStateAutoScrolling, false)]
[InlineData(SubFlowLayoutPanel.ScrollStateFullDrag, false)]
[InlineData(SubFlowLayoutPanel.ScrollStateHScrollVisible, false)]
[InlineData(SubFlowLayoutPanel.ScrollStateUserHasScrolled, false)]
[InlineData(SubFlowLayoutPanel.ScrollStateVScrollVisible, false)]
[InlineData(int.MaxValue, false)]
[InlineData((-1), false)]
public void FlowLayoutPanel_GetScrollState_Invoke_ReturnsExpected(int bit, bool expected)
{
using SubFlowLayoutPanel control = new();
Assert.Equal(expected, control.GetScrollState(bit));
}
[WinFormsTheory]
[InlineData(ControlStyles.ContainerControl, true)]
[InlineData(ControlStyles.UserPaint, true)]
[InlineData(ControlStyles.Opaque, false)]
[InlineData(ControlStyles.ResizeRedraw, false)]
[InlineData(ControlStyles.FixedWidth, false)]
[InlineData(ControlStyles.FixedHeight, false)]
[InlineData(ControlStyles.StandardClick, true)]
[InlineData(ControlStyles.Selectable, false)]
[InlineData(ControlStyles.UserMouse, false)]
[InlineData(ControlStyles.SupportsTransparentBackColor, true)]
[InlineData(ControlStyles.StandardDoubleClick, true)]
[InlineData(ControlStyles.AllPaintingInWmPaint, false)]
[InlineData(ControlStyles.CacheText, false)]
[InlineData(ControlStyles.EnableNotifyMessage, false)]
[InlineData(ControlStyles.DoubleBuffer, false)]
[InlineData(ControlStyles.OptimizedDoubleBuffer, false)]
[InlineData(ControlStyles.UseTextForAccessibility, true)]
[InlineData((ControlStyles)0, true)]
[InlineData((ControlStyles)int.MaxValue, false)]
[InlineData((ControlStyles)(-1), false)]
public void FlowLayoutPanel_GetStyle_Invoke_ReturnsExpected(ControlStyles flag, bool expected)
{
using SubFlowLayoutPanel control = new();
Assert.Equal(expected, control.GetStyle(flag));
// Call again to test caching.
Assert.Equal(expected, control.GetStyle(flag));
}
[WinFormsFact]
public void FlowLayoutPanel_GetTopLevel_Invoke_ReturnsExpected()
{
using SubFlowLayoutPanel control = new();
Assert.False(control.GetTopLevel());
}
[WinFormsTheory]
[BoolData]
public void FlowLayoutPanel_SetFlowBreak_Invoke_GetFlowBreakReturnsExpected(bool value)
{
using Control child = new();
using FlowLayoutPanel control = new();
int layoutCallCount = 0;
control.Layout += (sender, e) => layoutCallCount++;
int childLayoutCallCount = 0;
child.Layout += (sender, e) => childLayoutCallCount++;
control.SetFlowBreak(child, value);
Assert.Equal(value, control.GetFlowBreak(child));
Assert.Equal(0, layoutCallCount);
Assert.Equal(0, childLayoutCallCount);
Assert.False(control.IsHandleCreated);
Assert.False(child.IsHandleCreated);
// Set same.
control.SetFlowBreak(child, value);
Assert.Equal(value, control.GetFlowBreak(child));
Assert.Equal(0, layoutCallCount);
Assert.Equal(0, childLayoutCallCount);
Assert.False(control.IsHandleCreated);
Assert.False(child.IsHandleCreated);
// Set different.
control.SetFlowBreak(child, !value);
Assert.Equal(!value, control.GetFlowBreak(child));
Assert.Equal(0, layoutCallCount);
Assert.Equal(0, childLayoutCallCount);
Assert.False(control.IsHandleCreated);
Assert.False(child.IsHandleCreated);
}
[WinFormsTheory]
[InlineData(true, 1)]
[InlineData(false, 0)]
public void FlowLayoutPanel_SetFlowBreak_InvokeControlWithParent_GetFlowBreakReturnsExpected(bool value, int expectedParentLayoutCallCount)
{
using Control parent = new();
using Control child = new()
{
Parent = parent
};
using FlowLayoutPanel control = new();
int layoutCallCount = 0;
control.Layout += (sender, e) => layoutCallCount++;
int childLayoutCallCount = 0;
child.Layout += (sender, e) => childLayoutCallCount++;
int parentLayoutCallCount = 0;
void parentHandler(object sender, LayoutEventArgs eventArgs)
{
Assert.Same(parent, sender);
Assert.Same(child, eventArgs.AffectedControl);
Assert.Equal("FlowBreak", eventArgs.AffectedProperty);
parentLayoutCallCount++;
}
parent.Layout += parentHandler;
try
{
control.SetFlowBreak(child, value);
Assert.Equal(value, control.GetFlowBreak(child));
Assert.Equal(0, layoutCallCount);
Assert.Equal(0, childLayoutCallCount);
Assert.Equal(expectedParentLayoutCallCount, parentLayoutCallCount);
Assert.False(control.IsHandleCreated);
Assert.False(child.IsHandleCreated);
Assert.False(parent.IsHandleCreated);
// Set same.
control.SetFlowBreak(child, value);
Assert.Equal(value, control.GetFlowBreak(child));
Assert.Equal(0, layoutCallCount);
Assert.Equal(0, childLayoutCallCount);
Assert.Equal(expectedParentLayoutCallCount, parentLayoutCallCount);
Assert.False(control.IsHandleCreated);
Assert.False(child.IsHandleCreated);
Assert.False(parent.IsHandleCreated);
// Set different.
control.SetFlowBreak(child, !value);
Assert.Equal(!value, control.GetFlowBreak(child));
Assert.Equal(0, layoutCallCount);
Assert.Equal(0, childLayoutCallCount);
Assert.Equal(expectedParentLayoutCallCount + 1, parentLayoutCallCount);
Assert.False(control.IsHandleCreated);
Assert.False(child.IsHandleCreated);
Assert.False(parent.IsHandleCreated);
}
finally
{
parent.Layout -= parentHandler;
}
}
[WinFormsTheory]
[BoolData]
public void FlowLayoutPanel_SetFlowBreak_NullControl_ThrowsArgumentNullException(bool value)
{
using FlowLayoutPanel control = new();
Assert.Throws<ArgumentNullException>("control", () => control.SetFlowBreak(null, value));
}
private class SubFlowLayoutPanel : FlowLayoutPanel
{
public new const int ScrollStateAutoScrolling = ScrollableControl.ScrollStateAutoScrolling;
public new const int ScrollStateHScrollVisible = ScrollableControl.ScrollStateHScrollVisible;
public new const int ScrollStateVScrollVisible = ScrollableControl.ScrollStateVScrollVisible;
public new const int ScrollStateUserHasScrolled = ScrollableControl.ScrollStateUserHasScrolled;
public new const int ScrollStateFullDrag = ScrollableControl.ScrollStateFullDrag;
public new bool CanEnableIme => base.CanEnableIme;
public new bool CanRaiseEvents => base.CanRaiseEvents;
public new CreateParams CreateParams => base.CreateParams;
public new Cursor DefaultCursor => base.DefaultCursor;
public new ImeMode DefaultImeMode => base.DefaultImeMode;
public new Padding DefaultMargin => base.DefaultMargin;
public new Size DefaultMaximumSize => base.DefaultMaximumSize;
public new Size DefaultMinimumSize => base.DefaultMinimumSize;
public new Padding DefaultPadding => base.DefaultPadding;
public new Size DefaultSize => base.DefaultSize;
public new bool DesignMode => base.DesignMode;
public new bool DoubleBuffered
{
get => base.DoubleBuffered;
set => base.DoubleBuffered = value;
}
public new EventHandlerList Events => base.Events;
public new int FontHeight
{
get => base.FontHeight;
set => base.FontHeight = value;
}
public new ImeMode ImeModeBase
{
get => base.ImeModeBase;
set => base.ImeModeBase = value;
}
public new bool HScroll
{
get => base.HScroll;
set => base.HScroll = value;
}
public new bool ResizeRedraw
{
get => base.ResizeRedraw;
set => base.ResizeRedraw = value;
}
public new bool ShowFocusCues => base.ShowFocusCues;
public new bool ShowKeyboardCues => base.ShowKeyboardCues;
public new bool VScroll
{
get => base.VScroll;
set => base.VScroll = value;
}
public new AutoSizeMode GetAutoSizeMode() => base.GetAutoSizeMode();
public new bool GetScrollState(int bit) => base.GetScrollState(bit);
public new bool GetStyle(ControlStyles flag) => base.GetStyle(flag);
public new bool GetTopLevel() => base.GetTopLevel();
}
}
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