vz: Fix scrollbar issue with runtime swizzle #4476
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The Code-Hex/vz library wraps VZVirtualMachineView in an NSScrollView with scrollbars hardcoded to YES (for their zoom feature). This causes ~16px of the VM display to be cut off by scrollbar gutters. This patch uses Objective-C method swizzling to intercept NSScrollView's setDocumentView: method and disable scrollbars when the document view is a VZVirtualMachineView. This is a self-contained fix that doesn't require forking the vz library. Signed-off-by: stuffbucket <[email protected]>
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Adding images showing the behavior with the scrollbars. In the lower left there is some text that is occluded by the scroll. The scrollbars are not shown relative to the size of the desktop or display, they're hardcoded to be shown all the time. In the console case this seems to not create a problem, but in the desktop case it definitely does. 
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| // a VZVirtualMachineView. | ||
| // | ||
| // This is a temporary workaround until Code-Hex/vz adds a configuration option | ||
| // to disable scrollbars. See: https://github.com/Code-Hex/vz/issues/XXX |
| } | ||
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| // Constructor attribute ensures this runs before main() | ||
| // This patches NSScrollView before Code-Hex/vz creates any windows |
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Not a fan of monkey patching AppKit, could this be fixed in Code-Hex/vz ?
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@AkihiroSuda I agree. I tried to keep things simple here, not knowing how likely it would be to get a PR accepted in Code-Hex/vz, but I took some time to address the problem in Code-Hex/vz instead.
I put together a working solution that lets a caller to Code-Hex/vz implement their own GUI UX. The current GUI UI is still the default (although I fixed the scrollbar issue). The gui-linux example was expanded to show how a custom UX could be generated.
Code-Hex/vz issue: Code-Hex/vz/issues/210
Working implementation: stuffbucket/[email protected]
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how likely
Seems likely: Code-Hex/vz#210 (comment)
Let me mark this PR as a draft until the Code-Hex/vz issue can be resolved
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The Code-Hex/vz library wraps VZVirtualMachineView in an NSScrollView with scrollbars hardcoded to YES (for their zoom feature). This causes ~16px of the VM display to be cut off by scrollbar gutters.
This patch uses Objective-C method swizzling to intercept NSScrollView's setDocumentView: method and disable scrollbars when the document view is a VZVirtualMachineView.
This is a self-contained fix that doesn't require forking the vz library or add any dependencies.
Tested successfully on macOS 26.2 (see screenshot) with Debian 13 (Plasma) and Alpine (serial console).