AppDelegate: Add NSTextFinder find bar

Add a find bar leveraging NSTextFinder. It turns out I didn't need to do
anything custom with `NSTextFinder` since `NSTextView` conveniently
already has a `usesFindBar` property to turn on built-in support for it.
I discovered that by looking at the TextEdit source code available here:

https://developer.apple.com/library/archive/samplecode/TextEdit/Introduction/Intro.html

I added an `NSScrollView` because you kind of need one to implement
`NSTextFinder`. Not sure if the finding functionality would still work
without the scroll view.

Also use the proper `-performTextFinderAction:` selector for the "Find…"
menu item to open the find bar.

Now we can confirm that the "Find" menu items work correctly.

3 files changed, 25 insertions, 3 deletions

diff --git a/src/AppDelegate.h b/src/AppDelegate.h
index a9570b8..4dba427 100644
--- a/src/AppDelegate.h
+++ b/src/AppDelegate.h
@@ -2,6 +2,8 @@
 
 @interface AppDelegate : NSObject <NSApplicationDelegate> {
 	NSWindow *_window;
+	NSScrollView *_scroll_view;
 	NSTextView *_text_view;
+	// NSTextFinder *_text_finder;
 }
 @end
diff --git a/src/AppDelegate.m b/src/AppDelegate.m
index d6cef3e..3df04e0 100644
--- a/src/AppDelegate.m
+++ b/src/AppDelegate.m
@@ -6,7 +6,9 @@
 - (void)dealloc
 {
 	[_window release];
+	[_scroll_view release];
 	[_text_view release];
+	// [_text_finder release];
 	[super dealloc];
 }
 
@@ -34,8 +36,20 @@
 	_text_view = [[NSTextView alloc]
 		initWithFrame:NSMakeRect(0, 0, 400, 400)];
 	[_text_view setAllowsUndo:YES];
-	[[_window contentView] addSubview:_text_view];
+	[_text_view setUsesFindBar:YES];
+
+	_scroll_view = [[NSScrollView alloc]
+		initWithFrame:NSMakeRect(0, 0, 400, 400)];
+	[_scroll_view setAutohidesScrollers:YES];
+	[_scroll_view setHasVerticalScroller:YES];
+	[_scroll_view setDocumentView:_text_view];
+
+	[[_window contentView] addSubview:_scroll_view];
 	// [_window setContentView:_text_view];
+
+	// _text_finder = [[NSTextFinder alloc] init];
+	// [_text_finder setClient:(id<NSTextFinderClient>)_text_view];
+	// [_text_finder setFindBarContainer:_scroll_view];
 }
 
 - (void)applicationDidFinishLaunching:(NSNotification *)notification
@@ -44,4 +58,10 @@
 	[_window makeKeyAndOrderFront:nil];
 }
 
+// - (IBAction)performTextFinderAction:(id)sender
+// {
+// 	NSLog(@"performTextFinderAction: performing %ld", [sender tag]);
+// 	[_text_finder performAction:[sender tag]];
+// }
+
 @end
diff --git a/src/MainMenu.m b/src/MainMenu.m
index a961f65..afc62b6 100644
--- a/src/MainMenu.m
+++ b/src/MainMenu.m
@@ -358,8 +358,8 @@ NSMenuItem *MainMenuCreateEditMenuItem()
 			@"Find…",
 			@"Find… menu item."
 		)
-		action:@selector(performFindPanelAction:)
-		// action:@selector(performTextFinderAction:)
+		// action:@selector(performFindPanelAction:)
+		action:@selector(performTextFinderAction:)
 		keyEquivalent:@"f"];
 	[find_ellipsis_menu_item setTag:NSTextFinderActionShowFindInterface];
 	// [find_ellipsis_menu_item setTag:1];