public void Form_DpiChanged_Bounds(int newDpi)
{
// Run tests only on Windows 10 versions that support thread dpi awareness.
if (!PlatformDetection.IsWindows10Version1803OrGreater)
{
return;
}
IntPtr originalAwarenessContext = User32.SetThreadDpiAwarenessContext(User32.DPI_AWARENESS_CONTEXT.PER_MONITOR_AWARE_V2);
try
{
using var form = new Form();
form.AutoScaleMode = AutoScaleMode.Dpi;
form.Show();
Drawing.Rectangle initialBounds = form.Bounds;
float initialFontSize = form.Font.Size;
DpiMessageHelper.TriggerDpiMessage(User32.WM.DPICHANGED, form, newDpi);
var factor = newDpi / DpiHelper.LogicalDpi;
// 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.
User32.SetThreadDpiAwarenessContext(originalAwarenessContext);
}
}
public void ToolStripItems_FontScaling(int newDpi)
{
// Run tests only on Windows 10 versions that support thread dpi awareness.
if (!PlatformDetection.IsWindows10Version1803OrGreater)
{
return;
}
// Set thread awareness context to PermonitorV2(PMv2).
IntPtr originalAwarenessContext = User32.SetThreadDpiAwarenessContext(User32.DPI_AWARENESS_CONTEXT.PER_MONITOR_AWARE_V2);
try
{
int clientWidth = 800;
using var form = new Form();
form.AutoScaleMode = AutoScaleMode.Dpi;
form.ClientSize = new Size(clientWidth, 450);
using var toolStrip = new ToolStrip();
using var toolStripItemOpen = new ToolStripButton("Open");
toolStrip.GripStyle = ToolStripGripStyle.Hidden;
toolStrip.Items.Add(toolStripItemOpen);
toolStrip.Location = new Point(0, 0);
toolStrip.Name = "toolStrip1";
toolStrip.Text = "toolStrip1";
using Font initialFont = toolStrip.Font = new Font("Segoe UI", 9F, FontStyle.Bold, GraphicsUnit.Point);
form.Show();
DpiMessageHelper.TriggerDpiMessage(User32.WM.DPICHANGED_BEFOREPARENT, toolStrip, newDpi);
var factor = newDpi / DpiHelper.LogicalDpi;
Assert.Equal((float)initialFont.Size * factor, toolStrip.Font.Size);
form.Close();
}
finally
{
// Reset back to original awareness context.
User32.SetThreadDpiAwarenessContext(originalAwarenessContext);
}
}