event bridge

this is probably a totally shit strategy

bg/background.go

@@ -29,6 +29,7 @@ func (bg *background) run() {
 		switch v := e.(type) {
 		case events.UserSelectedDirectory:
 			bg.setRoot(v.Path)
+			bg.out <- events.SetRootEvent{Path: v.Path}
 		}
 	}
 }

events/background_event.go

@@ -10,3 +10,8 @@ type backgroundEvent struct{ event }
 func (e backgroundEvent) isBackgroundEvent() {}
 
 type SigIntEvent struct{ backgroundEvent }
+
+type SetRootEvent struct {
+	Path string
+	backgroundEvent
+}

ui/AppDelegate.m

@@ -1,6 +1,12 @@
 #import "AppDelegate.h"
 #import "MainWindowController.h"
 
+@interface AppDelegate ()
+
+@property (nonatomic, strong) MainWindowController *windowController;
+
+@end
+
 @implementation AppDelegate
 
 // Application Startup ------------------------------------------------------{{{
@@ -59,14 +65,10 @@
 
 - (void) createMainWindow {
     NSLog(@"[AppDelegate] Creating Main Window");
-    // TODO: make a singleton? retain in a property of appdelegate?
-    // MainWindowController *windowController = [[[MainWindowController alloc] init] retain];
-    MainWindowController *windowController = [[MainWindowController alloc] init];
-    // NSLog(@"Window loaded: %d", [windowController isWindowLoaded]);
-    [windowController showWindow:self];
+    self.windowController = [[MainWindowController alloc] init];
+    [self.windowController showWindow:self];
 }
 
 // --------------------------------------------------------------------------}}}
-
 @end
 

ui/EventBridge.h

@@ -0,0 +1,7 @@
+#import <Cocoa/Cocoa.h>
+#import "EventListener.h"
+
+@interface EventBridge : NSObject
+@property (assign) id <EventListener> listener;
++ (instancetype) shared;
+@end

ui/EventBridge.m

@@ -0,0 +1,16 @@
+#import "EventBridge.h"
+
+@implementation EventBridge
+
++ (instancetype) shared {
+    static id instance;
+    static dispatch_once_t once;
+
+    dispatch_once(&once, ^{
+        instance = [EventBridge new];
+    });
+
+    return instance;
+}
+
+@end

ui/EventListener.h

@@ -0,0 +1,6 @@
+#import <Cocoa/Cocoa.h>
+
+@protocol EventListener
+- (void) serverDidSetRoot:(NSString *)path;
+@end
+

ui/MainViewController.h

@@ -1,4 +1,6 @@
 #import <Cocoa/Cocoa.h>
+#import "EventListener.h"
 
-@interface MainViewController : NSViewController
+@interface MainViewController : NSViewController <EventListener>
+- (void) serverDidSetRoot:(NSString *)path;
 @end

ui/MainViewController.m

@@ -1,6 +1,7 @@
 #import "_cgo_export.h"
 #import "MainViewController.h"
 #import "MainView.h"
+#import "EventBridge.h"
 
 @interface MainViewController ()
 
@@ -38,16 +39,27 @@
     [self.view addSubview:self.selectDirectoryButton];
 
     // create label to show selected directory
-	self.selectedDirectoryText = [NSTextField labelWithString:@"(none)"];
+	self.selectedDirectoryText = [NSTextField labelWithString:@"no directory selected"];
+    [self.selectedDirectoryText setTranslatesAutoresizingMaskIntoConstraints:NO];
 	[self.view addSubview:self.selectedDirectoryText];
 
-    // setup constraints
+    // place button in top right
     [self.selectDirectoryButton.rightAnchor
         constraintEqualToAnchor:self.view.rightAnchor
                        constant:-8.0].active = YES;
     [self.selectDirectoryButton.topAnchor
         constraintEqualToAnchor:self.view.topAnchor
                        constant:8.0].active = YES;
+
+	// place directory selection in top left
+	[self.selectedDirectoryText.leftAnchor
+		constraintEqualToAnchor:self.view.leftAnchor
+					   constant:8.0].active = YES;
+	[self.selectedDirectoryText.topAnchor
+		constraintEqualToAnchor:self.view.topAnchor
+					   constant:8.0].active = YES;
+
+	[[EventBridge shared] setListener:self];
 }
 
 - (void) selectDirectory {
@@ -93,4 +105,8 @@
     return [super viewDidLayout];
 }
 
+- (void) serverDidSetRoot:(NSString *)path {
+	[self.selectedDirectoryText setStringValue:path];
+}
+
 @end

ui/ui_darwin.go

@@ -2,6 +2,7 @@ package ui
 
 import (
 	"log"
+	"unsafe"
 
 	"github.com/jordanorelli/dws/events"
 )
@@ -9,6 +10,7 @@ import (
 /*
 #cgo CFLAGS: -x objective-c
 #cgo LDFLAGS: -framework Cocoa
+#include <stdlib.h>
 #include "ui_darwin.h"
 */
 import "C"
@@ -42,10 +44,14 @@ func (ui *cocoaUI) Run(out chan events.UserEvent, in chan events.BackgroundEvent
 
 func (ui *cocoaUI) forwardEvents() {
 	for e := range ui.in {
-		switch e.(type) {
+		switch v := e.(type) {
 		case events.SigIntEvent:
 			log.Println("Cocoa UI sees sig int, forwarding to NSApp")
 			C.shutdown()
+		case events.SetRootEvent:
+			cs := C.CString(v.Path)
+			C.set_root(cs)
+			C.free(unsafe.Pointer(cs))
 		}
 	}
 }

ui/ui_darwin.h

@@ -1,3 +1,4 @@
 void initialize();
 int run();
 void shutdown();
+void set_root(char *);

ui/ui_darwin.m

@@ -1,5 +1,6 @@
-#include <Cocoa/Cocoa.h>
-#include "AppDelegate.h"
+#import <Cocoa/Cocoa.h>
+#import "AppDelegate.h"
+#import "EventBridge.h"
 
 id defaultAutoreleasePool;
 id appDelegate;
@@ -20,3 +21,8 @@ int run() {
 void shutdown() {
 	[[NSApplication sharedApplication] terminate:nil];
 }
+
+void set_root(char *path) {
+	id listener = [[EventBridge shared] listener];
+	[listener serverDidSetRoot:[NSString stringWithUTF8String:path]];
+}