125 lines
4.1 KiB
Rust
125 lines
4.1 KiB
Rust
//! A wrapper for `NSViewController`. Uses interior mutability to
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use std::cell::RefCell;
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use std::rc::Rc;
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use cocoa::base::{id, nil, YES};
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use cocoa::foundation::NSArray;
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use objc_id::ShareId;
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use objc::runtime::Object;
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use objc::{msg_send, sel, sel_impl};
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use crate::color::Color;
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use crate::constants::{BACKGROUND_COLOR, VIEW_CONTROLLER_PTR};
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use crate::pasteboard::PasteboardType;
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use crate::view::traits::{Node, ViewController};
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use crate::view::controller::register_controller_class;
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/// A clone-able handler to a `ViewController` reference in the Objective C runtime. We use this
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/// instead of a stock `View` for easier recordkeeping, since it'll need to hold the `View` on that
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/// side anyway.
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#[derive(Debug, Default, Clone)]
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pub struct ViewHandle(Option<ShareId<Object>>);
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impl ViewHandle {
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/// Call this to set the background color for the backing layer.
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pub fn set_background_color(&self, color: Color) {
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if let Some(controller) = &self.0 {
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unsafe {
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let view: id = msg_send![*controller, view];
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(*view).set_ivar(BACKGROUND_COLOR, color.into_platform_specific_color());
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let _: () = msg_send![view, setNeedsDisplay:YES];
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}
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}
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}
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/// Register this view for drag and drop operations.
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pub fn register_for_dragged_types(&self, types: &[PasteboardType]) {
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if let Some(controller) = &self.0 {
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unsafe {
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let types = NSArray::arrayWithObjects(nil, &types.iter().map(|t| {
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t.to_nsstring()
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}).collect::<Vec<id>>());
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let view: id = msg_send![*controller, view];
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let _: () = msg_send![view, registerForDraggedTypes:types];
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}
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}
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}
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}
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/// A `View` wraps two different controllers - one on the Objective-C/Cocoa side, which forwards
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/// calls into your supplied `ViewController` trait object. This involves heap allocation, but all
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/// of Cocoa is essentially Heap'd, so... well, enjoy.
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#[derive(Clone)]
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pub struct View<T> {
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internal_callback_ptr: *const RefCell<T>,
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pub objc_controller: ViewHandle,
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pub controller: Rc<RefCell<T>>
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}
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impl<T> View<T> where T: ViewController + 'static {
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/// Allocates and configures a `ViewController` in the Objective-C/Cocoa runtime that maps over
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/// to your supplied view controller.
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pub fn new(controller: T) -> Self {
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let controller = Rc::new(RefCell::new(controller));
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let internal_callback_ptr = {
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let cloned = Rc::clone(&controller);
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Rc::into_raw(cloned)
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};
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let inner = unsafe {
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let view_controller: id = msg_send![register_controller_class::<T>(), new];
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(&mut *view_controller).set_ivar(VIEW_CONTROLLER_PTR, internal_callback_ptr as usize);
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let view: id = msg_send![view_controller, view];
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(&mut *view).set_ivar(VIEW_CONTROLLER_PTR, internal_callback_ptr as usize);
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ShareId::from_ptr(view_controller)
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};
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{
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let mut vc = controller.borrow_mut();
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(*vc).did_load(ViewHandle(Some(inner.clone())));
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}
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View {
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internal_callback_ptr: internal_callback_ptr,
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objc_controller: ViewHandle(Some(inner)),
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controller: controller
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}
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}
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pub fn set_background_color(&self, color: Color) {
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self.objc_controller.set_background_color(color);
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}
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pub fn register_for_dragged_types(&self, types: &[PasteboardType]) {
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self.objc_controller.register_for_dragged_types(types);
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}
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}
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impl<T> Node for View<T> {
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/// Returns the Objective-C object used for handling the view heirarchy.
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fn get_backing_node(&self) -> Option<ShareId<Object>> {
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self.objc_controller.0.clone()
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}
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}
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impl<T> std::fmt::Debug for View<T> {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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write!(f, "View ({:p})", self)
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}
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}
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impl<T> Drop for View<T> {
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/// A bit of extra cleanup for delegate callback pointers.
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fn drop(&mut self) {
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unsafe {
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let _ = Rc::from_raw(self.internal_callback_ptr);
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}
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}
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}
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