59 lines
2.3 KiB
Rust
59 lines
2.3 KiB
Rust
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//! A wrapper for `NSLayoutAnchorX`, which is typically used to handle values for how a
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//! given view should layout along the x-axis. Of note: the only thing that can't be protected
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//! against is mixing/matching incorrect left/leading and right/trailing anchors. Be careful!
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use cocoa::base::id;
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use objc::{msg_send, sel, sel_impl};
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use objc::runtime::Object;
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use objc_id::ShareId;
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use crate::layout::constraint::LayoutConstraint;
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/// A wrapper for `NSLayoutAnchor`. You should never be creating this yourself - it's more of a
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/// factory/helper for creating `LayoutConstraint` objects based on your views.
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#[derive(Clone, Debug, Default)]
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pub struct LayoutAnchorY(pub Option<ShareId<Object>>);
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impl LayoutAnchorY {
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/// An internal method for wrapping existing constraints.
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pub(crate) fn new(object: id) -> Self {
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LayoutAnchorY(Some(unsafe {
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ShareId::from_ptr(object)
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}))
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}
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/// Return a constraint equal to another vertical anchor.
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pub fn constraint_equal_to(&self, anchor_to: &LayoutAnchorY) -> LayoutConstraint {
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match (&self.0, &anchor_to.0) {
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(Some(from), Some(to)) => LayoutConstraint::new(unsafe {
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msg_send![*from, constraintEqualToAnchor:&*to]
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}),
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_ => { panic!("Attempted to create vertical constraints with an uninitialized anchor!"); }
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}
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}
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/// Return a constraint greater than or equal to another vertical anchor.
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pub fn constraint_greater_than_or_equal_to(&self, anchor_to: &LayoutAnchorY) -> LayoutConstraint {
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match (&self.0, &anchor_to.0) {
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(Some(from), Some(to)) => LayoutConstraint::new(unsafe {
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msg_send![*from, constraintGreaterThanOrEqualToAnchor:&*to]
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}),
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_ => { panic!("Attempted to create vertical constraints with an uninitialized anchor!"); }
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}
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}
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/// Return a constraint less than or equal to another vertical anchor.
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pub fn constraint_less_than_or_equal_to(&self, anchor_to: &LayoutAnchorY) -> LayoutConstraint {
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match (&self.0, &anchor_to.0) {
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(Some(from), Some(to)) => LayoutConstraint::new(unsafe {
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msg_send![*from, constraintLessThanOrEqualToAnchor:&*to]
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}),
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_ => { panic!("Attempted to create vertical constraints with an uninitialized anchor!"); }
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}
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}
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}
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