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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 Windows.Win32.UI.HiDpi;
using Xunit.Abstractions;
namespace System.Windows.Forms.UITests.Dpi;
public class FormDpiTests : ControlTestBase
{
public FormDpiTests(ITestOutputHelper testOutputHelper)
: base(testOutputHelper)
{
}
[WinFormsTheory]
[InlineData(3.5 * ScaleHelper.OneHundredPercentLogicalDpi)]
public void Form_DpiChanged_Bounds(int newDpi)
{
// Run tests only on Windows 10 versions that support thread dpi awareness.
if (!PlatformDetection.IsWindows10Version1803OrGreater)
{
return;
}
DPI_AWARENESS_CONTEXT originalAwarenessContext = PInvoke.SetThreadDpiAwarenessContextInternal(DPI_AWARENESS_CONTEXT.DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2);
typeof(ScaleHelper).TestAccessor().Dynamic.InitializeStatics();
try
{
using Form form = new();
form.AutoScaleMode = AutoScaleMode.Dpi;
form.Show();
Drawing.Rectangle initialBounds = form.Bounds;
float initialFontSize = form.Font.Size;
DpiMessageHelper.TriggerDpiMessage(PInvoke.WM_DPICHANGED, form, newDpi);
// Lab machines giving strange values that I could not explain. for ex: on local machine,
// I get 1050*1050 for factor 3.5. This is not same on lab machines ( ex, we get 1044). For now,
// just verifying they are scaled.
Assert.NotEqual(initialBounds.Width, form.Bounds.Width);
Assert.NotEqual(initialBounds.Height, form.Bounds.Height);
Assert.NotEqual(initialFontSize, form.Font.Size);
form.Close();
}
finally
{
// Reset back to original awareness context.
PInvoke.SetThreadDpiAwarenessContextInternal(originalAwarenessContext);
}
}
[WinFormsTheory]
[InlineData(3.5 * ScaleHelper.OneHundredPercentLogicalDpi)]
public void Form_DpiChanged_MinMaxSizeNotChanged_Default(int newDpi)
{
// Run tests only on Windows 10 versions that support thread dpi awareness.
if (!PlatformDetection.IsWindows10Version1803OrGreater)
{
return;
}
DPI_AWARENESS_CONTEXT originalAwarenessContext = PInvoke.SetThreadDpiAwarenessContext(DPI_AWARENESS_CONTEXT.DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2);
typeof(ScaleHelper).TestAccessor().Dynamic.InitializeStatics();
try
{
var minSize = new Drawing.Size(100, 100);
var maxSize = new Drawing.Size(500, 500);
using Form form = new();
form.MinimumSize = minSize;
form.MaximumSize = maxSize;
form.AutoScaleMode = AutoScaleMode.Dpi;
form.Show();
DpiMessageHelper.TriggerDpiMessage(PInvoke.WM_DPICHANGED, form, newDpi);
Assert.Equal(form.MinimumSize, minSize);
Assert.Equal(form.MaximumSize, maxSize);
form.Close();
}
finally
{
// Reset back to original awareness context.
PInvoke.SetThreadDpiAwarenessContext(originalAwarenessContext);
}
}
[WinFormsTheory]
[InlineData(3.5 * ScaleHelper.OneHundredPercentLogicalDpi)]
public void Form_DpiChanged_MinMaxSizeChanged_WithRuntimeSetting(int newDpi)
{
// Run tests only on Windows 10 versions that support thread dpi awareness.
if (!PlatformDetection.IsWindows10Version1803OrGreater)
{
return;
}
DPI_AWARENESS_CONTEXT originalAwarenessContext = PInvoke.SetThreadDpiAwarenessContext(DPI_AWARENESS_CONTEXT.DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2);
typeof(ScaleHelper).TestAccessor().Dynamic.InitializeStatics();
try
{
var minSize = new Drawing.Size(100, 100);
var maxSize = new Drawing.Size(500, 500);
using Form form = new();
form.MinimumSize = minSize;
form.MaximumSize = maxSize;
form.AutoScaleMode = AutoScaleMode.Dpi;
form.Show();
// Explicitly opt-in to resize min and max sizes with Dpi changed event.
using ScaleTopLevelFormMinMaxSizeForDpiScope scope = new(enable: true);
DpiMessageHelper.TriggerDpiMessage(PInvoke.WM_DPICHANGED, form, newDpi);
Assert.NotEqual(form.MinimumSize, minSize);
Assert.NotEqual(form.MaximumSize, maxSize);
form.Close();
}
finally
{
// Reset back to original awareness context.
PInvoke.SetThreadDpiAwarenessContext(originalAwarenessContext);
}
}
[WinFormsTheory]
[InlineData(3.5 * ScaleHelper.OneHundredPercentLogicalDpi)]
public void Form_DpiChanged_NonLinear_DesiredSize(int newDpi)
{
// Run tests only on Windows 10 versions that support thread dpi awareness.
if (!PlatformDetection.IsWindows10Version1803OrGreater)
{
return;
}
DPI_AWARENESS_CONTEXT originalAwarenessContext = PInvoke.SetThreadDpiAwarenessContext(DPI_AWARENESS_CONTEXT.DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2);
typeof(ScaleHelper).TestAccessor().Dynamic.InitializeStatics();
try
{
using Form form = new();
form.AutoScaleMode = AutoScaleMode.Font;
form.Show();
DpiMessageHelper.TriggerDpiMessage(PInvoke.WM_DPICHANGED, form, newDpi);
Drawing.Size nonLinearSize = form.Size;
// Rollback to 96 Dpi, and change AutoScaleMode to check with linear size
DpiMessageHelper.TriggerDpiMessage(PInvoke.WM_DPICHANGED, form, ScaleHelper.OneHundredPercentLogicalDpi);
form.AutoScaleMode = AutoScaleMode.Dpi;
DpiMessageHelper.TriggerDpiMessage(PInvoke.WM_DPICHANGED, form, newDpi);
Assert.NotEqual(form.Size, nonLinearSize);
form.Close();
}
finally
{
// Reset back to original awareness context.
PInvoke.SetThreadDpiAwarenessContext(originalAwarenessContext);
}
}
[WinFormsTheory]
[InlineData(3.5 * ScaleHelper.OneHundredPercentLogicalDpi)]
public void Form_DpiChanged_FormCacheSize(int newDpi)
{
// Run tests only on Windows 10 versions that support thread dpi awareness.
if (!PlatformDetection.IsWindows10Version1803OrGreater)
{
return;
}
DPI_AWARENESS_CONTEXT originalAwarenessContext = PInvoke.SetThreadDpiAwarenessContext(DPI_AWARENESS_CONTEXT.DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2);
typeof(ScaleHelper).TestAccessor().Dynamic.InitializeStatics();
try
{
using Form form = new();
form.AutoScaleMode = AutoScaleMode.Font;
form.Show();
DpiMessageHelper.TriggerDpiMessage(PInvoke.WM_DPICHANGED, form, newDpi);
dynamic fomrTestAccessor = form.TestAccessor().Dynamic;
Assert.NotNull(fomrTestAccessor._dpiFormSizes);
Assert.Equal(2, fomrTestAccessor._dpiFormSizes.Count);
form.Close();
}
finally
{
// Reset back to original awareness context.
PInvoke.SetThreadDpiAwarenessContext(originalAwarenessContext);
}
}
[WinFormsTheory]
[InlineData(3.5 * ScaleHelper.OneHundredPercentLogicalDpi)]
public void Form_DpiChanged_AutoScaleMode_Dpi_FormDoesNotCacheSize(int newDpi)
{
// Run tests only on Windows 10 versions that support thread dpi awareness.
if (!PlatformDetection.IsWindows10Version1803OrGreater)
{
return;
}
DPI_AWARENESS_CONTEXT originalAwarenessContext = PInvoke.SetThreadDpiAwarenessContext(DPI_AWARENESS_CONTEXT.DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2);
typeof(ScaleHelper).TestAccessor().Dynamic.InitializeStatics();
try
{
using Form form = new();
form.AutoScaleMode = AutoScaleMode.Dpi;
form.Show();
DpiMessageHelper.TriggerDpiMessage(PInvoke.WM_DPICHANGED, form, newDpi);
Assert.Null(form.TestAccessor().Dynamic._dpiFormSizes);
form.Close();
}
finally
{
// Reset back to original awareness context.
PInvoke.SetThreadDpiAwarenessContext(originalAwarenessContext);
}
}
[WinFormsFact]
public void Form_SizeNotCached_SystemAwareMode()
{
// Run tests only on Windows 10 versions that support thread dpi awareness.
if (!PlatformDetection.IsWindows10Version1803OrGreater)
{
return;
}
DPI_AWARENESS_CONTEXT originalAwarenessContext = PInvoke.SetThreadDpiAwarenessContext(DPI_AWARENESS_CONTEXT.DPI_AWARENESS_CONTEXT_SYSTEM_AWARE);
typeof(ScaleHelper).TestAccessor().Dynamic.InitializeStatics();
try
{
using Form form = new();
form.AutoScaleMode = AutoScaleMode.Font;
form.Show();
Assert.Null(form.TestAccessor().Dynamic._dpiFormSizes);
form.Close();
}
finally
{
// Reset back to original awareness context.
PInvoke.SetThreadDpiAwarenessContext(originalAwarenessContext);
}
}
}
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