General comment cleaning / refactoring for Mac Installer

chrome/installer/mac/app/InstallerWindowController.m

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "InstallerWindowController.h"
 
 #import "AppDelegate.h"
 
 @interface InstallerWindowController () {
   NSButton* importButton_;
   NSButton* defaultBrowserButton_;
   NSButton* optInButton_;
   NSButton* launchButton_;
   NSTextField* statusDescription_;
   NSTextField* downloadProgressDescription_;
   NSProgressIndicator* progressBar_;
 }
 @end
 
 @implementation InstallerWindowController
 
-// Most buttons have the same style and differ only by their title, this method
-// simplifies styling the buttons and provides an argument for the title.
+// Simplify styling and naming buttons.
 - (void)stylizeButton:(NSButton*)button withTitle:(NSString*)title {
   button.buttonType = NSSwitchButton;
   button.bezelStyle = NSRoundedBezelStyle;
   button.title = title;
 }
 
-// Similar to stylizeButton except works with NSTextField objects instead.
-- (void)stylizeTextField:(NSTextField*)textField
-         withDescription:(NSString*)description {
-  textField.backgroundColor = NSColor.clearColor;
-  textField.textColor = NSColor.blackColor;
-  textField.stringValue = description;
-  textField.bezeled = NO;
-  textField.editable = NO;
-}
-
 // Positions and stylizes buttons.
 - (void)setUpButtons {
   importButton_ = [[NSButton alloc] initWithFrame:NSMakeRect(30, 20, 300, 25)];
   [self stylizeButton:importButton_
             withTitle:@"Import from... Wait import what?"];
 
   defaultBrowserButton_.state = NSOnState;
   defaultBrowserButton_ =
       [[NSButton alloc] initWithFrame:NSMakeRect(30, 45, 300, 25)];
   [self stylizeButton:defaultBrowserButton_
             withTitle:@"Make Chrome the default browser."];
 
   optInButton_ = [[NSButton alloc] initWithFrame:NSMakeRect(30, 70, 300, 25)];
   [self stylizeButton:optInButton_ withTitle:@"Say yes to UMA."];
 
   launchButton_ = [[NSButton alloc] initWithFrame:NSMakeRect(310, 6, 100, 50)];
   launchButton_.buttonType = NSPushOnPushOffButton;
   launchButton_.bezelStyle = NSRoundedBezelStyle;
   launchButton_.title = @"Launch";
   [launchButton_ setEnabled:NO];
   [launchButton_ setAction:@selector(launchButtonClicked)];
 }
 
+// Simplfy styling NSTextField objects.
+- (void)stylizeTextField:(NSTextField*)textField
+         withDescription:(NSString*)description {
+  textField.backgroundColor = NSColor.clearColor;
+  textField.textColor = NSColor.blackColor;
+  textField.stringValue = description;
+  textField.bezeled = NO;
+  textField.editable = NO;
+}
+
 // Positions and stylizes textfields.
 - (void)setUpTextfields {
   statusDescription_ =
       [[NSTextField alloc] initWithFrame:NSMakeRect(20, 95, 300, 20)];
   [self stylizeTextField:statusDescription_
          withDescription:@"Working on it! While you're waiting..."];
 
   downloadProgressDescription_ =
       [[NSTextField alloc] initWithFrame:NSMakeRect(20, 160, 300, 20)];
   [self stylizeTextField:downloadProgressDescription_
          withDescription:@"Downloading... "];
 }
 
 // Positions and stylizes the progressbar for download and install.
 - (void)setUpProgressBar {
   progressBar_ =
       [[NSProgressIndicator alloc] initWithFrame:NSMakeRect(15, 125, 400, 50)];
   progressBar_.indeterminate = NO;
   progressBar_.style = NSProgressIndicatorBarStyle;
   progressBar_.maxValue = 100.0;
   progressBar_.minValue = 0.0;
   progressBar_.doubleValue = 0.0;
 }
 
-// Positions and adds the rest of the UI elements to main window. Prevents
-// resizing the window so that the absolute position will look the same on all
-// computers. Window is hidden until all positioning is finished.
+// Positions the main window and adds the rest of the UI elements to it.
+// Prevents resizing the window so that the absolute position will look the same
+// on all computers. Window is hidden until all positioning is finished.
 - (id)initWithWindow:(NSWindow*)window {
   if (self = [super initWithWindow:window]) {
     [window setFrame:NSMakeRect(0, 0, 430, 220) display:YES];
     [window center];
     [window setStyleMask:[window styleMask] & ~NSResizableWindowMask];
 
     [self setUpButtons];
     [self setUpProgressBar];
     [self setUpTextfields];
 
     [window.contentView addSubview:importButton_];
     [window.contentView addSubview:defaultBrowserButton_];
     [window.contentView addSubview:optInButton_];
     [window.contentView addSubview:launchButton_];
     [window.contentView addSubview:progressBar_];
     [window.contentView addSubview:statusDescription_];
     [window.contentView addSubview:downloadProgressDescription_];
     [NSApp activateIgnoringOtherApps:YES];
     [window makeKeyAndOrderFront:self];
   }
   return self;
 }
 
 - (void)updateStatusDescription:(NSString*)text {
-  // First setStringValue statement is required to clear the original string.
-  // Omitting the first line will cause occasional ghosting of the previous
-  // string.
-  // TODO: Find a real solution to the ghosting problem.
-  //  downloadProgressDescription_.stringValue = @"";
+  // TODO: This method somehow causes ghosting of the previous string's contents
+  // after a redraw. The below line of code is a temporary hack to clear the
+  // ghosting behavior, but it should be replaced with a legitimate bug fix.
+  downloadProgressDescription_.stringValue = @"";
   downloadProgressDescription_.stringValue = text;
 }
 
 - (void)updateDownloadProgress:(double)progressPercent {
   if (progressPercent > 0.0) {
     progressBar_.doubleValue = progressPercent;
   } else {
+    // After the progress bar is made indeterminate, it will not need to track
+    // determinate progress any more. Therefore, there is nothing implemented to
+    // set indeterminate to NO.
     progressBar_.doubleValue = 0.0;
     progressBar_.indeterminate = YES;
     [progressBar_ startAnimation:nil];
   }
 }
 
 - (void)enableLaunchButton {
   [launchButton_ setEnabled:YES];
 }
 
 - (void)launchButtonClicked {
   // TODO: Launch the app and start ejecting disk.
   [NSApp terminate:nil];
 }
 
 - (BOOL)isUserMetricsChecked {
   return optInButton_.state == NSOnState;
 }
 
 - (BOOL)isDefaultBrowserChecked {
   return defaultBrowserButton_.state == NSOnState;
 }
 
 @end