private void AssertControlStyle()

in sources/Google.Solutions.Mvvm/Theme/DpiAwarenessRuleset.cs [42:136]
59 lines of code
19 McCabe index (conditional complexity)

        private void AssertControlStyle(Control c)
        {
            if (c is Form form)
            {
                //
                // Forms must use:
                //
                //   AutoScaleMode = DPI
                //   CurrentAutoScaleDimensions = 96x96
                //

                Debug.Assert(
                    form.AutoScaleMode == AutoScaleMode.Dpi ||
                    form.AutoScaleMode == AutoScaleMode.Inherit);
                if (form.AutoScaleMode == AutoScaleMode.Dpi)
                {
                    Debug.Assert(form.CurrentAutoScaleDimensions.Width >= DpiAwareness.DefaultDpi.Width);
                    Debug.Assert(form.CurrentAutoScaleDimensions.Width == form.CurrentAutoScaleDimensions.Height);
                }

                if (form.FormBorderStyle == FormBorderStyle.FixedDialog ||
                    form.FormBorderStyle == FormBorderStyle.FixedToolWindow ||
                    form.FormBorderStyle == FormBorderStyle.FixedSingle)
                {
                    //
                    // If the Control box is hidden, the size of the form isn't
                    // adjusted correctly.
                    //
                    Debug.Assert(form.ControlBox);
                    if (form.Parent != null)
                    {
                        Debug.Assert(!form.ShowIcon);
                        Debug.Assert(!form.ShowInTaskbar);
                    }
                }
            }
            else if (c is UserControl userControl)
            {
                //
                // UserControls must use:
                //
                //   AutoScaleMode = DPI
                //   CurrentAutoScaleDimensions = 96x96
                //

                Debug.Assert(userControl.AutoScaleMode == AutoScaleMode.Dpi ||
                             userControl.AutoScaleMode == AutoScaleMode.Inherit);

                if (userControl.AutoScaleMode == AutoScaleMode.Dpi)
                {
                    Debug.Assert(userControl.CurrentAutoScaleDimensions.Width >= DpiAwareness.DefaultDpi.Width);
                    Debug.Assert(userControl.CurrentAutoScaleDimensions.Width == userControl.CurrentAutoScaleDimensions.Height);
                }

                bool isLaterallyAnchored(Control c)
                {
                    return
                        c.Dock == DockStyle.Fill ||
                        c.Anchor.HasFlag(AnchorStyles.Top | AnchorStyles.Bottom) ||
                        c.Anchor.HasFlag(AnchorStyles.Left | AnchorStyles.Right);
                }

                //
                // If the UserControl is anchored and contains controls
                // that are also anchored, then it must use the
                // DpiAwareUserControl mitigation.
                //
                if (!(userControl is DpiAwareUserControl) &&
                    isLaterallyAnchored(userControl) &&
                    userControl.Controls.OfType<Control>().Any(isLaterallyAnchored))
                {
                    Debug.Assert(false, "User control should be derived from " + nameof(DpiAwareUserControl));
                }
            }
            else if (c is PropertyGrid)
            {
                //
                // PropertyGrid uses Mode = None, and that's ok.
                //
            }
            else if (c is ContainerControl otherContainer)
            {
                //
                // Other containers should use Mode = Inherit.
                //
                Debug.Assert(otherContainer.AutoScaleMode == AutoScaleMode.Inherit);
            }
            else if (c is CheckBox checkBox)
            {
                //
                // Auto-scaling is prone to cause alignment issues.
                //
                Debug.Assert(!checkBox.AutoSize, $"{checkBox.Name} should use AutoScale = false");
            }
        }