69 lines
2.7 KiB
Rust
69 lines
2.7 KiB
Rust
//! A wrapper for `NSLayoutAnchorDimension`, which is typically used to handle `width` and `height`
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//! values for how a given view should layout.
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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::foundation::{id, CGFloat};
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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 LayoutAnchorDimension(pub Option<ShareId<Object>>);
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impl LayoutAnchorDimension {
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/// An internal method for wrapping existing anchors.
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pub(crate) fn new(object: id) -> Self {
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LayoutAnchorDimension(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 a constant value.
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pub fn constraint_equal_to_constant(&self, constant: f64) -> LayoutConstraint {
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match &self.0 {
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Some(from) => LayoutConstraint::new(unsafe {
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let value = constant as CGFloat;
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msg_send![*from, constraintEqualToConstant:value]
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}),
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_ => { panic!("Attempted to create constraints with an uninitialized anchor!"); }
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}
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}
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/// Return a constraint equal to another dimension anchor.
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pub fn constraint_equal_to(&self, anchor_to: &LayoutAnchorDimension) -> 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 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 dimension anchor.
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pub fn constraint_greater_than_or_equal_to(&self, anchor_to: &LayoutAnchorDimension) -> 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 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 dimension anchor.
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pub fn constraint_less_than_or_equal_to(&self, anchor_to: &LayoutAnchorDimension) -> 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 constraints with an uninitialized anchor!"); }
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}
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}
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}
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