Add "enable-larger-than-screen" option for BrowserWindow.

From now on BrowserWindow can only be resized larger than screen or
moved out of screen when this option is set to "true".

Fixes #582.

atom/browser/native_window.cc

@@ -58,6 +58,7 @@ NativeWindow::NativeWindow(content::WebContents* web_contents,
                            const mate::Dictionary& options)
     : content::WebContentsObserver(web_contents),
       has_frame_(true),
+      enable_larger_than_screen_(false),
       is_closed_(false),
       node_integration_("except-iframe"),
       has_dialog_attached_(false),
@@ -66,6 +67,7 @@ NativeWindow::NativeWindow(content::WebContents* web_contents,
       inspectable_web_contents_(
           brightray::InspectableWebContents::Create(web_contents)) {
   options.Get(switches::kFrame, &has_frame_);
+  options.Get(switches::kEnableLargerThanScreen, &enable_larger_than_screen_);
 
   // Read icon before window is created.
   options.Get(switches::kIcon, &icon_);

atom/browser/native_window.h

@@ -251,6 +251,9 @@ class NativeWindow : public brightray::DefaultWebContentsDelegate,
   // Whether window has standard frame.
   bool has_frame_;
 
+  // Whether window can be resized larger than screen.
+  bool enable_larger_than_screen_;
+
   // Window icon.
   gfx::ImageSkia icon_;
 

atom/browser/native_window_mac.mm

@@ -108,10 +108,12 @@ static const CGFloat kAtomWindowCornerRadius = 4.0;
 @end
 
 @interface AtomNSWindow : EventProcessingWindow {
- @protected
+ @private
   atom::NativeWindowMac* shell_;
+  bool enable_larger_than_screen_;
 }
 - (void)setShell:(atom::NativeWindowMac*)shell;
+- (void)setEnableLargerThanScreen:(bool)enable;
 @end
 
 @implementation AtomNSWindow
@@ -120,9 +122,16 @@ static const CGFloat kAtomWindowCornerRadius = 4.0;
   shell_ = shell;
 }
 
+- (void)setEnableLargerThanScreen:(bool)enable {
+  enable_larger_than_screen_ = enable;
+}
+
 // Enable the window to be larger than screen.
 - (NSRect)constrainFrameRect:(NSRect)frameRect toScreen:(NSScreen*)screen {
-  return frameRect;
+  if (enable_larger_than_screen_)
+    return frameRect;
+  else
+    return [super constrainFrameRect:frameRect toScreen:screen];
 }
 
 - (IBAction)reload:(id)sender {
@@ -213,6 +222,7 @@ NativeWindowMac::NativeWindowMac(content::WebContents* web_contents,
                     defer:YES];
 
   [atomWindow setShell:this];
+  [atomWindow setEnableLargerThanScreen:enable_larger_than_screen_];
   window_.reset(atomWindow);
 
   AtomNSWindowDelegate* delegate =

atom/browser/native_window_views.cc

@@ -114,16 +114,18 @@ NativeWindowViews::NativeWindowViews(content::WebContents* web_contents,
       menu_bar_alt_pressed_(false),
       keyboard_event_handler_(new views::UnhandledKeyboardEventHandler),
       use_content_size_(false),
-      resizable_(true),
-      // We need to set a default maximum window size here otherwise Windows
-      // will not allow us to resize the window larger than scree.
-      // Setting directly to INT_MAX somehow doesn't work, so we just devide
-      // by 10, which should still be large enough.
-      maximum_size_(INT_MAX / 10, INT_MAX / 10) {
+      resizable_(true) {
   options.Get(switches::kResizable, &resizable_);
   options.Get(switches::kTitle, &title_);
   options.Get(switches::kAutoHideMenuBar, &menu_bar_autohide_);
 
+  if (enable_larger_than_screen_)
+    // We need to set a default maximum window size here otherwise Windows
+    // will not allow us to resize the window larger than scree.
+    // Setting directly to INT_MAX somehow doesn't work, so we just devide
+    // by 10, which should still be large enough.
+    maximum_size_.set(INT_MAX / 10, INT_MAX / 10);
+
   int width = 800, height = 600;
   options.Get(switches::kWidth, &width);
   options.Get(switches::kHeight, &height);