Ongoing efforts, experimenting with stack/heap issues (ObjC/NSObject/AppKit are... mostly heap already), further work on Pasteboard support

appkit/Cargo.toml

@@ -16,6 +16,7 @@ lazy_static = "1"
 objc = "0.2.7"
 objc_id = "0.1.1"
 uuid = { version = "0.8", features = ["v4"] }
+url = "2.1.1"
 
 [features]
 enable-webview-downloading = []

appkit/src/dragdrop.rs

@@ -5,8 +5,11 @@
 use cocoa::foundation::NSUInteger;
 
 use objc::runtime::Object;
+use objc::{msg_send, sel, sel_impl};
 use objc_id::Id;
 
+use crate::pasteboard::Pasteboard;
+
 /// Represents operations that can happen for a given drag/drop scenario.
 pub enum DragOperation {
     /// No drag operations are allowed.
@@ -56,5 +59,13 @@ pub struct DragInfo {
 }
 
 impl DragInfo {
-    
+    /// Returns a wrapped Pasteboard instance, enabling you to get the contents of whatever is
+    /// being pasted/dragged/dropped/etc.
+    ///
+    /// Note: in general, you should not store pasteboards.
+    pub fn get_pasteboard(&self) -> Pasteboard {
+        unsafe {
+            Pasteboard::with(msg_send![&*self.info, draggingPasteboard])
+        }
+    }
 }

appkit/src/error.rs

@@ -0,0 +1,51 @@
+//! A wrapper for `NSError`, which can be (and is) bubbled up for certain calls in this library. It
+//! attempts to be thread safe where possible, and extract the "default" usable information out of
+//! an `NSError`. This might not be what you need, though, so if it's missing something... well,
+//! it's up for discussion.
+
+use std::error;
+use std::fmt;
+
+use cocoa::base::id;
+use objc::{msg_send, sel, sel_impl};
+
+use crate::utils::str_from;
+
+/// A wrapper around pieces of data extracted from `NSError`. This could be improved: right now, it
+/// allocates `String` instances when theoretically it could be avoided, and we might be erasing
+/// certain parts of the `NSError` object that are useful.
+#[derive(Clone, Debug)]
+pub struct AppKitError {
+    pub code: usize,
+    pub domain: String,
+    pub description: String
+}
+
+impl AppKitError {
+    /// Given an `NSError` (i.e, an id reference) we'll pull out the relevant information and
+    /// configure this. We pull out the information as it makes the error thread safe this way,
+    /// which is... easier, in some cases.
+    pub fn new(error: id) -> Box<Self> {
+        let (code, domain, description) = unsafe {
+            let code: usize = msg_send![error, code];
+            let domain: id = msg_send![error, domain];
+            let description: id = msg_send![error, localizedDescription];
+
+            (code, domain, description)
+        };
+
+        Box::new(AppKitError {
+            code: code,
+            domain: str_from(domain).to_string(),
+            description: str_from(description).to_string()
+        })
+    }
+}
+
+impl fmt::Display for AppKitError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self.description)
+    }
+}
+
+impl error::Error for AppKitError {}

appkit/src/filesystem/manager.rs

@@ -1,69 +1,92 @@
 //! A wrapper for `NSFileManager`, which is necessary for macOS/iOS (the sandbox makes things
 //! tricky, and this transparently handles it for you).
 
-use std::rc::Rc;
-use std::cell::RefCell;
+use std::error::Error;
+use std::sync::RwLock;
 
 use cocoa::base::{id, nil, NO};
-use cocoa::foundation::NSUInteger;
-
+use cocoa::foundation::{NSString, NSUInteger};
 use objc_id::Id;
-use objc::runtime::Object;
+use objc::runtime::{BOOL, Object};
 use objc::{class, msg_send, sel, sel_impl};
+use url::Url;
 
+use crate::error::AppKitError;
 use crate::filesystem::enums::{SearchPathDirectory, SearchPathDomainMask};
 use crate::utils::str_from;
 
-pub struct FileManagerInner {
-    pub manager: Id<Object>
+pub struct FileManager {
+    pub manager: RwLock<Id<Object>>
 }
 
-impl Default for FileManagerInner {
+impl Default for FileManager {
+    /// Returns a default file manager, which maps to the default system file manager. For common
+    /// and simple tasks, with no callbacks, you might want this.
     fn default() -> Self {
-        FileManagerInner {
-            manager: unsafe {
+        FileManager {
+            manager: RwLock::new(unsafe {
                 let manager: id = msg_send![class!(NSFileManager), defaultManager];
                 Id::from_ptr(manager)
-            }
+            })
         }
     }
 }
 
-impl FileManagerInner {
-    pub fn get_path(&self, directory: SearchPathDirectory, in_domain: SearchPathDomainMask) -> Result<String, Box<dyn std::error::Error>> {
+impl FileManager {
+    /// Returns a new FileManager that opts in to delegate methods.
+    pub fn new() -> Self {
+        FileManager {
+            manager: RwLock::new(unsafe {
+                let manager: id = msg_send![class!(NSFileManager), new];
+                Id::from_ptr(manager)
+            })
+        }
+    }
+
+    /// Given a directory/domain combination, will attempt to get the directory that matches.
+    /// Returns a PathBuf that wraps the given location. If there's an error on the Objective-C
+    /// side, we attempt to catch it and bubble it up.
+    pub fn get_directory(&self, directory: SearchPathDirectory, in_domain: SearchPathDomainMask) -> Result<Url, Box<dyn Error>> {
         let dir: NSUInteger = directory.into();
         let mask: NSUInteger = in_domain.into();
 
-        unsafe {
-            let dir: id = msg_send![&*self.manager, URLForDirectory:dir 
+        let directory = unsafe {
+            let manager = self.manager.read().unwrap();
+            let dir: id = msg_send![&**manager, URLForDirectory:dir 
                 inDomain:mask
                 appropriateForURL:nil
                 create:NO
                 error:nil];
 
-            let s: id = msg_send![dir, path];
-            Ok(str_from(s).to_string())
-        }
+            let s: id = msg_send![dir, absoluteString];
+            str_from(s)
+        };
+        
+        Url::parse(directory).map_err(|e| e.into())
     }
-}
 
-#[derive(Default)]
-pub struct FileManager(Rc<RefCell<FileManagerInner>>);
+    /// Given two paths, moves file (`from`) to the location specified in `to`. This can result in
+    /// an error on the Objective-C side, which we attempt to handle and bubble up as a result if
+    /// so.
+    pub fn move_item(&self, from: Url, to: Url) -> Result<(), Box<dyn Error>> {
+        unsafe {
+            let s = NSString::alloc(nil).init_str(from.as_str());
+            let from_url: id = msg_send![class!(NSURL), URLWithString:s];
 
-impl FileManager {
-    pub fn new() -> Self {
-        FileManager(Rc::new(RefCell::new(FileManagerInner {
-            manager: unsafe {
-                let manager: id = msg_send![class!(NSFileManager), new];
-                Id::from_ptr(manager)
+            let s2 = NSString::alloc(nil).init_str(to.as_str());
+            let to_url: id = msg_send![class!(NSURL), URLWithString:s2];
+
+            // This should potentially be write(), but the backing class handles this logic
+            // already, so... going to leave it as read.
+            let manager = self.manager.read().unwrap();
+
+            let error: id = nil;
+            let result: BOOL = msg_send![&**manager, moveItemAtURL:from_url toURL:to_url error:&error];
+            if result == NO {
+                return Err(AppKitError::new(error));
             }
-        })))
-    }
+        }
 
-    pub fn get_path(&self, directory: SearchPathDirectory, in_domain: SearchPathDomainMask) -> Result<String, Box<dyn std::error::Error>> {
-        let manager = self.0.borrow();
-        manager.get_path(directory, in_domain)
+        Ok(())
     }
-
-    //pub fn contents_of(directory: &str, properties: &[
 }

appkit/src/lib.rs

@@ -27,6 +27,7 @@ pub mod color;
 pub mod collection_view;
 pub mod constants;
 pub mod dragdrop;
+pub mod error;
 pub mod events;
 pub mod filesystem;
 pub mod geometry;
@@ -40,6 +41,9 @@ pub mod view;
 pub mod webview;
 pub mod window;
 
+// We re-export these so that they can be used without increasing build times.
+pub use url;
+
 pub mod prelude {
     pub use crate::app::{App, AppDelegate};
     
@@ -60,6 +64,6 @@ pub mod prelude {
     pub use crate::view::{View, ViewController, ViewWrapper};
 
     pub use appkit_derive::{
-        WindowWrapper
+        WindowWrapper, ViewWrapper
     };
 }

appkit/src/pasteboard/pasteboard.rs

@@ -2,13 +2,18 @@
 //! (think: drag and drop between applications). It exposes a Rust interface that tries to be
 //! complete, but might not cover everything 100% right now - feel free to pull request.
 
-use cocoa::base::id;
+use std::error::Error;
 
+use cocoa::base::{id, nil};
+use cocoa::foundation::{NSArray};
 use objc::runtime::Object;
 use objc::{class, msg_send, sel, sel_impl};
 use objc_id::Id;
+use url::Url;
 
-use crate::pasteboard::types::PasteboardName;
+use crate::error::AppKitError;
+use crate::pasteboard::types::{PasteboardName, PasteboardType};
+use crate::utils::str_from;
 
 /// Represents an `NSPasteboard`, enabling you to handle copy/paste/drag and drop.
 pub struct Pasteboard {
@@ -32,7 +37,7 @@ impl Pasteboard {
         }
     }
 
-    /// Should be pasteboardname enum!
+    /// Retrieves the system Pasteboard for the given name/type.
     pub fn named(name: PasteboardName) -> Self {
         Pasteboard {
             inner: unsafe {
@@ -64,4 +69,60 @@ impl Pasteboard {
             let _: () = msg_send![&*self.inner, clearContents];
         }
     }
+
+    /// Looks inside the pasteboard contents and extracts what FileURLs are there, if any.
+    pub fn get_file_urls(&self) -> Result<Vec<Url>, Box<dyn Error>> {
+        unsafe {
+            let mut i = 0;
+            
+            let class: id = msg_send![class!(NSURL), class];
+            let classes: id = NSArray::arrayWithObjects(nil, &[class]);
+            let contents: id = msg_send![&*self.inner, readObjectsForClasses:classes options:nil];
+            
+            // This can happen if the Pasteboard server has an error in returning items.
+            // In our case, we'll bubble up an error by checking the pasteboard.
+            if contents == nil {
+                // This error is not necessarily "correct", but in the event of an error in
+                // Pasteboard server retrieval I'm not sure where to check... and this stuff is
+                // kinda ancient and has conflicting docs in places. ;P
+                return Err(Box::new(AppKitError {
+                    code: 666,
+                    domain: "com.appkit-rs.pasteboard".to_string(),
+                    description: "Pasteboard server returned no data.".to_string()
+                }));
+            }
+
+            let count: usize = msg_send![contents, count];
+            let mut urls: Vec<Url> = Vec::with_capacity(count);
+            
+            loop {
+                let nsurl: id = msg_send![contents, objectAtIndex:i];
+                let path: id = msg_send![nsurl, path];
+                let s = str_from(path);
+                urls.push(Url::parse(&format!("file://{}", s))?);
+
+                i += 1;
+                if i == count { break; }
+            }
+
+            Ok(urls)
+        }
+    }
+/*
+    /// Retrieves the pasteboard contents as a string. This can be `None` (`nil` on the Objective-C
+    /// side) if the pasteboard data doesn't match the requested type, so check accordingly.
+    ///
+    /// Note: In macOS 10.6 and later, if the receiver contains multiple items that can provide string, 
+    /// RTF, or RTFD data, the text data from each item is returned as a combined result separated by newlines.
+    /// This Rust wrapper is a quick pass, and could be improved. ;P
+    pub fn contents_for(&self, pasteboard_type: PasteboardType) -> Option<String> {
+        unsafe {
+            let contents: id = msg_send![&*self.inner, stringForType:pasteboard_type.to_nsstring()];
+            if contents != nil {
+                return Some(str_from(contents).to_string());
+            }
+        }
+
+        None
+    }*/
 }

appkit/src/pasteboard/types.rs

@@ -7,10 +7,19 @@ use cocoa::foundation::NSString;
 /// Constants for the standard system pasteboard names.
 #[derive(Debug, Copy, Clone)]
 pub enum PasteboardName {
+    /// The dragging/dropping pasteboard.
     Drag,
+
+    /// The find pasteboard.
     Find,
+
+    /// The font pasteboard.
     Font,
+
+    /// The general pasteboard.
     General,
+
+    /// The ruler pasteboard.
     Ruler
 }
 
@@ -19,11 +28,11 @@ impl PasteboardName {
     pub fn to_nsstring(&self) -> id {
         unsafe {
             NSString::alloc(nil).init_str(match self {
-                PasteboardName::Drag => "",
-                PasteboardName::Find => "",
-                PasteboardName::Font => "",
-                PasteboardName::General => "",
-                PasteboardName::Ruler => ""
+                PasteboardName::Drag => "Apple CFPasteboard drag",
+                PasteboardName::Find => "Apple CFPasteboard find",
+                PasteboardName::Font => "Apple CFPasteboard font",
+                PasteboardName::General => "Apple CFPasteboard general",
+                PasteboardName::Ruler => "Apple CFPasteboard ruler"
             })
         }
     }

appkit/src/view/class.rs

@@ -15,8 +15,10 @@ use cocoa::foundation::{NSUInteger};
 use objc::declare::ClassDecl;
 use objc::runtime::{Class, Object, Sel, BOOL};
 use objc::{msg_send, sel, sel_impl};
+use objc_id::Id;
 
 use crate::constants::{BACKGROUND_COLOR, VIEW_CONTROLLER_PTR};
+use crate::dragdrop::DragInfo;
 use crate::view::traits::ViewController;
 
 /// Enforces normalcy, or: a needlessly cruel method in terms of the name. You get the idea though.
@@ -37,21 +39,25 @@ extern fn update_layer(this: &Object, _: Sel) {
 }
 
 /// Called when a drag/drop operation has entered this view.
-extern fn dragging_entered<T: ViewController>(this: &mut Object, _: Sel, _: id) -> NSUInteger {
+extern fn dragging_entered<T: ViewController>(this: &mut Object, _: Sel, info: id) -> NSUInteger {
     unsafe {
         let ptr: usize = *this.get_ivar(VIEW_CONTROLLER_PTR);
         let view = ptr as *const T;
-        (*view).dragging_entered().into()
+        (*view).dragging_entered(DragInfo {
+            info: Id::from_ptr(info)
+        }).into()
     }
 }
 
 /// Called when a drag/drop operation has entered this view.
-extern fn prepare_for_drag_operation<T: ViewController>(this: &mut Object, _: Sel, _: id) -> BOOL {
+extern fn prepare_for_drag_operation<T: ViewController>(this: &mut Object, _: Sel, info: id) -> BOOL {
     unsafe {
         let ptr: usize = *this.get_ivar(VIEW_CONTROLLER_PTR);
         let view = ptr as *const T;
 
-        match (*view).prepare_for_drag_operation() {
+        match (*view).prepare_for_drag_operation(DragInfo {
+            info: Id::from_ptr(info)
+        }) {
             true => YES,
             false => NO
         }
@@ -59,12 +65,14 @@ extern fn prepare_for_drag_operation<T: ViewController>(this: &mut Object, _: Se
 }
 
 /// Called when a drag/drop operation has entered this view.
-extern fn perform_drag_operation<T: ViewController>(this: &mut Object, _: Sel, _: id) -> BOOL {
+extern fn perform_drag_operation<T: ViewController>(this: &mut Object, _: Sel, info: id) -> BOOL {
     unsafe {
         let ptr: usize = *this.get_ivar(VIEW_CONTROLLER_PTR);
         let view = ptr as *const T;
 
-        match (*view).perform_drag_operation() {
+        match (*view).perform_drag_operation(DragInfo {
+            info: Id::from_ptr(info)
+        }) {
             true => YES,
             false => NO
         }
@@ -72,11 +80,25 @@ extern fn perform_drag_operation<T: ViewController>(this: &mut Object, _: Sel, _
 }
 
 /// Called when a drag/drop operation has entered this view.
-extern fn dragging_exited<T: ViewController>(this: &mut Object, _: Sel, _: id) {
+extern fn conclude_drag_operation<T: ViewController>(this: &mut Object, _: Sel, info: id) {
     unsafe {
         let ptr: usize = *this.get_ivar(VIEW_CONTROLLER_PTR);
         let view = ptr as *const T;
-        (*view).dragging_exited();
+
+        (*view).conclude_drag_operation(DragInfo {
+            info: Id::from_ptr(info)
+        });
+    }
+}
+
+/// Called when a drag/drop operation has entered this view.
+extern fn dragging_exited<T: ViewController>(this: &mut Object, _: Sel, info: id) {
+    unsafe {
+        let ptr: usize = *this.get_ivar(VIEW_CONTROLLER_PTR);
+        let view = ptr as *const T;
+        (*view).dragging_exited(DragInfo {
+            info: Id::from_ptr(info)
+        });
     }
 }
 
@@ -103,6 +125,7 @@ pub(crate) fn register_view_class<T: ViewController>() -> *const Class {
         decl.add_method(sel!(draggingEntered:), dragging_entered::<T> as extern fn (&mut Object, _, _) -> NSUInteger);
         decl.add_method(sel!(prepareForDragOperation:), prepare_for_drag_operation::<T> as extern fn (&mut Object, _, _) -> BOOL);
         decl.add_method(sel!(performDragOperation:), perform_drag_operation::<T> as extern fn (&mut Object, _, _) -> BOOL);
+        decl.add_method(sel!(concludeDragOperation:), conclude_drag_operation::<T> as extern fn (&mut Object, _, _));
         decl.add_method(sel!(draggingExited:), dragging_exited::<T> as extern fn (&mut Object, _, _));
         
         VIEW_CLASS = decl.register();

appkit/src/view/controller.rs

@@ -3,7 +3,7 @@
 
 use std::sync::Once;
 
-use cocoa::base::{id, nil, YES, NO};
+use cocoa::base::{id, NO};
 use cocoa::foundation::{NSRect};
 
 use objc::declare::ClassDecl;

appkit/src/view/traits.rs

@@ -4,7 +4,7 @@ use objc::runtime::Object;
 
 use objc_id::ShareId;
 
-use crate::dragdrop::DragOperation;
+use crate::dragdrop::{DragInfo, DragOperation};
 
 pub trait ViewWrapper {
     fn get_handle(&self) -> Option<ShareId<Object>>;
@@ -13,8 +13,19 @@ pub trait ViewWrapper {
 pub trait ViewController {
     fn did_load(&self);
 
-    fn dragging_entered(&self) -> DragOperation { DragOperation::None }
-    fn prepare_for_drag_operation(&self) -> bool { false }
-    fn perform_drag_operation(&self) -> bool { false }
-    fn dragging_exited(&self) {}
+    /// Invoked when the dragged image enters destination bounds or frame; returns dragging operation to perform.
+    fn dragging_entered(&self, _info: DragInfo) -> DragOperation { DragOperation::None }
+    
+    /// Invoked when the image is released, allowing the receiver to agree to or refuse drag operation.
+    fn prepare_for_drag_operation(&self, _info: DragInfo) -> bool { false }
+
+    /// Invoked after the released image has been removed from the screen, signaling the receiver to import the pasteboard data.
+    fn perform_drag_operation(&self, _info: DragInfo) -> bool { false }
+
+    /// Invoked when the dragging operation is complete, signaling the receiver to perform any necessary clean-up.
+    fn conclude_drag_operation(&self, _info: DragInfo) {}
+
+    /// Invoked when the dragged image exits the destination’s bounds rectangle (in the case of a view) or its frame 
+    /// rectangle (in the case of a window object).
+    fn dragging_exited(&self, _info: DragInfo) {}
 }

appkit/src/view/view.rs

@@ -3,7 +3,7 @@
 use std::rc::Rc;
 use std::cell::RefCell;
 
-use cocoa::base::{id, nil, YES, NO};
+use cocoa::base::{id, nil, YES};
 use cocoa::foundation::NSArray;
 
 use objc_id::ShareId;
@@ -86,3 +86,9 @@ impl View {
         view.set_background_color(color);
     }
 }
+
+impl std::fmt::Debug for View {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "View ({:p})", self)
+    }
+}

appkit/src/window/config.rs

@@ -35,7 +35,7 @@ impl Default for WindowConfig {
             let dimensions = NSRect::new(NSPoint::new(0., 0.), NSSize::new(800., 600.));
 
             let style = WindowStyle::Resizable | WindowStyle::Miniaturizable | WindowStyle::UnifiedTitleAndToolbar |
-                WindowStyle::Closable | WindowStyle::Titled;
+                WindowStyle::Closable | WindowStyle::Titled | WindowStyle::FullSizeContentView;
 
             let alloc: id = msg_send![class!(NSWindow), alloc];
             let window: id = msg_send![alloc, initWithContentRect:dimensions styleMask:style backing:2 as NSUInteger defer:YES];

derives/src/lib.rs

@@ -7,13 +7,13 @@ use crate::proc_macro::TokenStream;
 use quote::quote;
 use syn::{DeriveInput, parse_macro_input};
 
-/// Derivces an `appkit::prelude::WinWrapper` block, which implements forwarding methods for things
+/// Derivces an `appkit::prelude::WindowWrapper` block, which implements forwarding methods for things
 /// like setting the window title, or showing and closing it. It currently expects that the wrapped
 /// struct has `window` as the field holding the `Window` from `appkit-rs`.
 ///
 /// Note that this expects that pointers to Window(s) should not move once created.
 #[proc_macro_derive(WindowWrapper)]
-pub fn impl_window_controller(input: TokenStream) -> TokenStream {
+pub fn impl_window_wrapper(input: TokenStream) -> TokenStream {
     let input = parse_macro_input!(input as DeriveInput);
 
     let name = &input.ident;
@@ -30,3 +30,24 @@ pub fn impl_window_controller(input: TokenStream) -> TokenStream {
 
     TokenStream::from(expanded)
 }
+
+/// Derives an `appkit::prelude::ViewWrapper` block, which implements some necessary bits and
+/// pieces for View handling. 
+#[proc_macro_derive(ViewWrapper)]
+pub fn impl_view_wrapper(input: TokenStream) -> TokenStream {
+    let input = parse_macro_input!(input as DeriveInput);
+
+    let name = &input.ident;
+    let generics = input.generics;
+    let (impl_generics, ty_generics, where_clause) = generics.split_for_impl();
+
+    let expanded = quote! {
+        impl #impl_generics appkit::prelude::ViewWrapper for #name #ty_generics #where_clause {
+            fn get_handle(&self) -> Option<appkit::ShareId<appkit::Object>> {
+                self.view.get_handle()
+            }
+        }
+    };
+
+    TokenStream::from(expanded)
+}