Cleanup some previous merge errors

src/platform_impl/macos/util/cursor.rs

@@ -0,0 +1,149 @@
+use cocoa::{
+    appkit::NSImage, base::{id, nil, YES},
+    foundation::{NSDictionary, NSPoint, NSString},
+};
+use objc::runtime::Sel;
+
+use super::IntoOption;
+use MouseCursor;
+
+pub enum Cursor {
+    Native(&'static str),
+    Undocumented(&'static str),
+    WebKit(&'static str),
+}
+
+impl From<MouseCursor> for Cursor {
+    fn from(cursor: MouseCursor) -> Self {
+        match cursor {
+            MouseCursor::Arrow | MouseCursor::Default => Cursor::Native("arrowCursor"),
+            MouseCursor::Hand => Cursor::Native("pointingHandCursor"),
+            MouseCursor::Grabbing | MouseCursor::Grab => Cursor::Native("closedHandCursor"),
+            MouseCursor::Text => Cursor::Native("IBeamCursor"),
+            MouseCursor::VerticalText => Cursor::Native("IBeamCursorForVerticalLayout"),
+            MouseCursor::Copy => Cursor::Native("dragCopyCursor"),
+            MouseCursor::Alias => Cursor::Native("dragLinkCursor"),
+            MouseCursor::NotAllowed | MouseCursor::NoDrop => Cursor::Native("operationNotAllowedCursor"),
+            MouseCursor::ContextMenu => Cursor::Native("contextualMenuCursor"),
+            MouseCursor::Crosshair => Cursor::Native("crosshairCursor"),
+            MouseCursor::EResize => Cursor::Native("resizeRightCursor"),
+            MouseCursor::NResize => Cursor::Native("resizeUpCursor"),
+            MouseCursor::WResize => Cursor::Native("resizeLeftCursor"),
+            MouseCursor::SResize => Cursor::Native("resizeDownCursor"),
+            MouseCursor::EwResize | MouseCursor::ColResize => Cursor::Native("resizeLeftRightCursor"),
+            MouseCursor::NsResize | MouseCursor::RowResize => Cursor::Native("resizeUpDownCursor"),
+
+            // Undocumented cursors: https://stackoverflow.com/a/46635398/5435443
+            MouseCursor::Help => Cursor::Undocumented("_helpCursor"),
+            MouseCursor::ZoomIn => Cursor::Undocumented("_zoomInCursor"),
+            MouseCursor::ZoomOut => Cursor::Undocumented("_zoomOutCursor"),
+            MouseCursor::NeResize => Cursor::Undocumented("_windowResizeNorthEastCursor"),
+            MouseCursor::NwResize => Cursor::Undocumented("_windowResizeNorthWestCursor"),
+            MouseCursor::SeResize => Cursor::Undocumented("_windowResizeSouthEastCursor"),
+            MouseCursor::SwResize => Cursor::Undocumented("_windowResizeSouthWestCursor"),
+            MouseCursor::NeswResize => Cursor::Undocumented("_windowResizeNorthEastSouthWestCursor"),
+            MouseCursor::NwseResize => Cursor::Undocumented("_windowResizeNorthWestSouthEastCursor"),
+
+            // While these are available, the former just loads a white arrow,
+            // and the latter loads an ugly deflated beachball!
+            // MouseCursor::Move => Cursor::Undocumented("_moveCursor"),
+            // MouseCursor::Wait => Cursor::Undocumented("_waitCursor"),
+
+            // An even more undocumented cursor...
+            // https://bugs.eclipse.org/bugs/show_bug.cgi?id=522349
+            // This is the wrong semantics for `Wait`, but it's the same as
+            // what's used in Safari and Chrome.
+            MouseCursor::Wait | MouseCursor::Progress => Cursor::Undocumented("busyButClickableCursor"),
+
+            // For the rest, we can just snatch the cursors from WebKit...
+            // They fit the style of the native cursors, and will seem
+            // completely standard to macOS users.
+            // https://stackoverflow.com/a/21786835/5435443
+            MouseCursor::Move | MouseCursor::AllScroll => Cursor::WebKit("move"),
+            MouseCursor::Cell => Cursor::WebKit("cell"),
+        }
+    }
+}
+
+impl Default for Cursor {
+    fn default() -> Self {
+        Cursor::Native("arrowCursor")
+    }
+}
+
+impl Cursor {
+    pub unsafe fn load(&self) -> id {
+        match self {
+            Cursor::Native(cursor_name) => {
+                let sel = Sel::register(cursor_name);
+                msg_send![class!(NSCursor), performSelector:sel]
+            },
+            Cursor::Undocumented(cursor_name) => {
+                let class = class!(NSCursor);
+                let sel = Sel::register(cursor_name);
+                let sel = if msg_send![class, respondsToSelector:sel] {
+                    sel
+                } else {
+                    warn!("Cursor `{}` appears to be invalid", cursor_name);
+                    sel!(arrowCursor)
+                };
+                msg_send![class, performSelector:sel]
+            },
+            Cursor::WebKit(cursor_name) => load_webkit_cursor(cursor_name)
+                .unwrap_or_else(|message| {
+                    warn!("{}", message);
+                    Self::default().load()
+                }),
+        }
+    }
+}
+
+// Note that loading `busybutclickable` with this code won't animate the frames;
+// instead you'll just get them all in a column.
+unsafe fn load_webkit_cursor(cursor_name_str: &str) -> Result<id, String> {
+    static CURSOR_ROOT: &'static str = "/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/HIServices.framework/Versions/A/Resources/cursors";
+    let cursor_root = NSString::alloc(nil).init_str(CURSOR_ROOT);
+    let cursor_name = NSString::alloc(nil).init_str(cursor_name_str);
+    let cursor_pdf = NSString::alloc(nil).init_str("cursor.pdf");
+    let cursor_plist = NSString::alloc(nil).init_str("info.plist");
+    let key_x = NSString::alloc(nil).init_str("hotx");
+    let key_y = NSString::alloc(nil).init_str("hoty");
+
+    let cursor_path: id = msg_send![cursor_root,
+        stringByAppendingPathComponent:cursor_name
+    ];
+    let pdf_path: id = msg_send![cursor_path,
+        stringByAppendingPathComponent:cursor_pdf
+    ];
+    let info_path: id = msg_send![cursor_path,
+        stringByAppendingPathComponent:cursor_plist
+    ];
+
+    let image = NSImage::alloc(nil)
+        .initByReferencingFile_(pdf_path)
+        // This will probably never be `None`, since images are loaded lazily...
+        .into_option()
+        // because of that, we need to check for validity.
+        .filter(|image| image.isValid() == YES)
+        .ok_or_else(||
+            format!("Failed to read image for `{}` cursor", cursor_name_str)
+        )?;
+    let info = NSDictionary::dictionaryWithContentsOfFile_(nil, info_path)
+        .into_option()
+        .ok_or_else(||
+            format!("Failed to read info for `{}` cursor", cursor_name_str)
+        )?;
+    let x = info.valueForKey_(key_x);
+    let y = info.valueForKey_(key_y);
+    let point = NSPoint::new(
+        msg_send![x, doubleValue],
+        msg_send![y, doubleValue],
+    );
+    let cursor: id = msg_send![class!(NSCursor), alloc];
+    let cursor: id = msg_send![cursor, initWithImage:image hotSpot:point];
+    cursor
+        .into_option()
+        .ok_or_else(||
+            format!("Failed to initialize `{}` cursor", cursor_name_str)
+        )
+}

src/platform_impl/macos/util/into_option.rs

@@ -0,0 +1,14 @@
+use cocoa::base::{id, nil};
+
+pub trait IntoOption: Sized {
+    fn into_option(self) -> Option<Self>;
+}
+
+impl IntoOption for id {
+    fn into_option(self) -> Option<Self> {
+        match self != nil {
+            true => Some(self),
+            false => None,
+        }
+    }
+}

src/platform_impl/macos/util/mod.rs

@@ -1,7 +1,13 @@
+mod cursor;
+mod into_option;
+
+pub use self::{cursor::Cursor, into_option::IntoOption};
+
 use cocoa::appkit::NSWindowStyleMask;
 use cocoa::base::{id, nil};
 use cocoa::foundation::{NSRect, NSUInteger};
 use core_graphics::display::CGDisplay;
+use objc::runtime::{Class, Object};
 
 use platform_impl::platform::ffi;
 use platform_impl::platform::window::IdRef;
@@ -25,6 +31,25 @@ pub unsafe fn set_style_mask(window: id, view: id, mask: NSWindowStyleMask) {
     window.makeFirstResponder_(view);
 }
 
+pub unsafe fn toggle_style_mask(window: id, view: id, mask: NSWindowStyleMask, on: bool) {
+    use cocoa::appkit::NSWindow;
+
+    let current_style_mask = window.styleMask();
+    if on {
+        window.setStyleMask_(current_style_mask | mask);
+    } else {
+        window.setStyleMask_(current_style_mask & (!mask));
+    }
+
+    // If we don't do this, key handling will break. Therefore, never call `setStyleMask` directly!
+    window.makeFirstResponder_(view);
+}
+
+pub unsafe fn superclass<'a>(this: &'a Object) -> &'a Class {
+    let superclass: id = msg_send![this, superclass];
+    &*(superclass as *const _)
+}
+
 pub unsafe fn create_input_context(view: id) -> IdRef {
     let input_context: id = msg_send![class!(NSTextInputContext), alloc];
     let input_context: id = msg_send![input_context, initWithClient:view];