libnyanpasu/clash-nyanpasu · error · anyhow::Error

failed to get zoom button

Error message

failed to get zoom button

What it means

During set_window_controls_pos, standardWindowButton(NSWindowButton::ZoomButton) returned None, so the code raises this error. AppKit could not supply the zoom (maximize) button for the window, which the function needs to compute the title bar layout.

Solutions

1. Verify the window style mask allows a zoom button before calling
2. Call the function after the window is shown
3. Skip repositioning (log warn) when the button is intentionally hidden
4. Treat the buttons as optional and reposition whichever exist

Example fix

// before
let zoom = window
    .standardWindowButton(NSWindowButton::ZoomButton)
    .ok_or(anyhow::anyhow!("failed to get zoom button"))?;
// after: optional zoom button
if let Some(zoom) = window.standardWindowButton(NSWindowButton::ZoomButton) {
    // position zoom
}

if window.standardWindowButton(NSWindowButton::ZoomButton).is_none() {
    log::warn!("zoom button unavailable; skip reposition");
    return Ok(());
}

if let Err(e) = set_window_controls_pos(&win, x, y).await {
    log::warn!("zoom button reposition failed: {e:#}");
}

When it happens

Trigger: Calling set_window_controls_pos on a window whose zoom button is absent — style mask lacking NSWindowStyleMask::Resizable/FullSizeContentView customization, or buttons hidden/removed before the call.

Common situations: Windows created without a maximize button; custom titlebar configs; calls made before window realization; fullscreen-only or utility-style windows.

Understand the failure class

Background: 'Could not be found', 'does not exist', 'not found in database': the resource-not-found family when an ID, slug, key, or URI lookup comes back empty — this error's family across 20 libraries.

Related errors

• failed to get close button
• failed to get miniaturize button
• failed to get close button
• failed to get miniaturize button
• failed to get zoom button

AI-assisted analysis of libnyanpasu/clash-nyanpasu@f7dbce2997 (2026-09-08). Data as JSON: /api/errors/75d5769b788a878c. Report an issue: GitHub.

Appendix: source

Thrown at backend/tauri/src/utils/resolve.rs:79

}

#[cfg(target_os = "macos")]
fn set_window_controls_pos(
    window: objc2::rc::Retained<objc2_app_kit::NSWindow>,
    x: f64,
    y: f64,
) -> anyhow::Result<()> {
    use objc2_app_kit::NSWindowButton;
    use objc2_foundation::NSRect;
    let close = window
        .standardWindowButton(NSWindowButton::CloseButton)
        .ok_or(anyhow::anyhow!("failed to get close button"))?;
    let miniaturize = window
        .standardWindowButton(NSWindowButton::MiniaturizeButton)
        .ok_or(anyhow::anyhow!("failed to get miniaturize button"))?;
    let zoom = window
        .standardWindowButton(NSWindowButton::ZoomButton)
        .ok_or(anyhow::anyhow!("failed to get zoom button"))?;

    let title_bar_container_view = unsafe {
        close
            .superview()
            .and_then(|view| view.superview())
            .ok_or(anyhow::anyhow!("failed to get title bar container view"))?
    };

    let close_rect = close.frame();
    let button_height = close_rect.size.height;

    let title_bar_frame_height = button_height + y;
    let mut title_bar_rect = title_bar_container_view.frame();
    title_bar_rect.size.height = title_bar_frame_height;
    title_bar_rect.origin.y = window.frame().size.height - title_bar_frame_height;
    unsafe {
        title_bar_container_view.setFrame(title_bar_rect);
    }

View on GitHub (pinned to f7dbce2997)