/*=========================================================================

Program:   Visualization Toolkit
Module:    vtkCocoaRenderWindow.mm

Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.  See the above copyright notice for more information.

=========================================================================*/

#include "vtk_glew.h"

#import "vtkCocoaMacOSXSDKCompatibility.h" // Needed to support old SDKs
#import "vtkOpenGLRenderWindow.h"
#import <Cocoa/Cocoa.h>

#import "vtkCocoaGLView.h"
#import "vtkCocoaRenderWindow.h"
#import "vtkCommand.h"
#import "vtkIdList.h"
#import "vtkObjectFactory.h"
#import "vtkOpenGLState.h"
#import "vtkOpenGLVertexBufferObjectCache.h"
#import "vtkRenderWindowInteractor.h"
#import "vtkRendererCollection.h"

#import <sstream>

vtkStandardNewMacro(vtkCocoaRenderWindow);

//----------------------------------------------------------------------------
// This is a private class and an implementation detail, do not use it.
// For fullscreen, an NSWindow that captures key events even when borderless
@interface vtkCocoaFullScreenWindow : NSWindow
{
}
@end

@implementation vtkCocoaFullScreenWindow
- (BOOL)canBecomeKeyWindow
{
  return YES;
}
@end

//----------------------------------------------------------------------------
// This is a private class and an implementation detail, do not use it.
// It manages the NSView/NSWindow. It observes for the NSView's frame changing
// position or size. It observes for the NSWindow closing.
//----------------------------------------------------------------------------
@interface vtkCocoaServer : NSObject
{
@private
  vtkCocoaRenderWindow* _renWin;
}

// Designated initializer
- (id)initWithRenderWindow:(vtkCocoaRenderWindow*)inRenderWindow;

- (void)startObservations;
- (void)stopObservations;

@end

//----------------------------------------------------------------------------
@implementation vtkCocoaServer

//----------------------------------------------------------------------------
- (id)initWithRenderWindow:(vtkCocoaRenderWindow*)inRenderWindow
{
  self = [super init];
  if (self)
  {
    _renWin = inRenderWindow;
  }
  return self;
}

//----------------------------------------------------------------------------
- (void)startObservations
{
  assert(_renWin);

  vtkTypeBool windowCreated = _renWin->GetWindowCreated();
  NSWindow* win = reinterpret_cast<NSWindow*>(_renWin->GetRootWindow());
  if (windowCreated && win)
  {
    // Receive notifications of this, and only this, window's closing.
    NSNotificationCenter* nc = [NSNotificationCenter defaultCenter];
    [nc addObserver:self
           selector:@selector(windowWillClose:)
               name:NSWindowWillCloseNotification
             object:win];
  }

  NSView* view = reinterpret_cast<NSView*>(_renWin->GetWindowId());
  if (view)
  {
    // Receive notifications of this, and only this, view's frame changing.
    NSNotificationCenter* nc = [NSNotificationCenter defaultCenter];
    [nc addObserver:self
           selector:@selector(viewFrameDidChange:)
               name:NSViewFrameDidChangeNotification
             object:view];
  }
}

//----------------------------------------------------------------------------
- (void)stopObservations
{
  assert(_renWin);

  vtkTypeBool windowCreated = _renWin->GetWindowCreated();
  NSWindow* win = reinterpret_cast<NSWindow*>(_renWin->GetRootWindow());
  if (windowCreated && win)
  {
    NSNotificationCenter* nc = [NSNotificationCenter defaultCenter];
    [nc removeObserver:self name:NSWindowWillCloseNotification object:win];
  }

  NSView* view = reinterpret_cast<NSView*>(_renWin->GetWindowId());
  if (view)
  {
    NSNotificationCenter* nc = [NSNotificationCenter defaultCenter];
    [nc removeObserver:self name:NSViewFrameDidChangeNotification object:view];
  }
}

//----------------------------------------------------------------------------
- (void)windowWillClose:(NSNotification*)aNotification
{
  // We should only get here if it was us that created the NSWindow.
  assert(_renWin);
  assert(_renWin->GetWindowCreated());

  // We should only have observed our own NSWindow.
  assert([aNotification object] == _renWin->GetRootWindow());
  (void)aNotification;

  // Stop observing because the window is closing.
  [self stopObservations];

  // The NSWindow is closing, so prevent anyone from accidentally using it.
  _renWin->SetRootWindow(nullptr);

  // Tell interactor to stop the NSApplication's run loop
  vtkRenderWindowInteractor* interactor = _renWin->GetInteractor();
  vtkTypeBool windowCreated = _renWin->GetWindowCreated();
  if (interactor && windowCreated)
  {
    interactor->TerminateApp();
  }
}

//----------------------------------------------------------------------------
- (void)viewFrameDidChange:(NSNotification*)aNotification
{
  // We should only have observed our own NSView.
  assert(_renWin);
  assert([aNotification object] == _renWin->GetWindowId());
  (void)aNotification;

  // Retrieve the Interactor.
  vtkRenderWindowInteractor* interactor = _renWin->GetInteractor();
  if (!interactor || !interactor->GetEnabled())
  {
    return;
  }

  // Get the NSView's new frame size (in points).
  NSView* view = reinterpret_cast<NSView*>(_renWin->GetWindowId());
  assert(view);
  NSRect viewRect = [view frame];

  // Convert from points to pixels.
  NSRect backingViewRect = [view convertRectToBacking:viewRect];

  int newWidth = static_cast<int>(NSWidth(backingViewRect));
  int newHeight = static_cast<int>(NSHeight(backingViewRect));

  // Get the interactor's current cache of the size.
  int size[2];
  interactor->GetSize(size);

  if (newWidth != size[0] || newHeight != size[1])
  {
    // Process the size change, this sends vtkCommand::WindowResizeEvent.
    interactor->UpdateSize(newWidth, newHeight);

    // Send vtkCommand::ConfigureEvent from the Interactor.
    interactor->InvokeEvent(vtkCommand::ConfigureEvent, nullptr);
  }
}

@end

//----------------------------------------------------------------------------
vtkCocoaRenderWindow::vtkCocoaRenderWindow()
{
  // First, create the cocoa objects manager. The dictionary is empty so
  // essentially all objects are initialized to NULL.
  NSMutableDictionary* cocoaManager = [NSMutableDictionary dictionary];

  // SetCocoaManager works like an Obj-C setter, so do like Obj-C and
  // init the ivar to null first.
  this->CocoaManager = nullptr;
  this->SetCocoaManager(reinterpret_cast<void*>(cocoaManager));
  [cocoaManager self]; // prevent premature collection under GC.

  this->WindowCreated = 0;
  this->ViewCreated = 0;
  this->SetWindowName("Visualization Toolkit - Cocoa");
  this->CursorHidden = 0;
  this->ForceMakeCurrent = 0;
  this->OnScreenInitialized = 0;
  this->WantsBestResolution = true;
  this->ConnectContextToNSView = true;
}

//----------------------------------------------------------------------------
vtkCocoaRenderWindow::~vtkCocoaRenderWindow()
{
  // If we created a vtkCocoaGLView, clear its reference back to us.
  if (this->GetViewCreated())
  {
    NSView* glView = (NSView*)this->GetWindowId();
    if ([glView isKindOfClass:[vtkCocoaGLView class]])
    {
      [(vtkCocoaGLView*)glView setVTKRenderWindow:nullptr];
    }
  }

  if (this->CursorHidden)
  {
    this->ShowCursor();
  }
  this->Finalize();

  vtkRenderer* ren;
  vtkCollectionSimpleIterator rit;
  this->Renderers->InitTraversal(rit);
  while ((ren = this->Renderers->GetNextRenderer(rit)))
  {
    ren->SetRenderWindow(nullptr);
  }

  this->SetContextId(nullptr);
  this->SetPixelFormat(nullptr);
  this->SetCocoaServer(nullptr);
  this->SetRootWindow(nullptr);
  this->SetWindowId(nullptr);
  this->SetParentId(nullptr);

  // Release the cocoa object manager.
  this->SetCocoaManager(nullptr);
}

//----------------------------------------------------------------------------
void vtkCocoaRenderWindow::Finalize()
{
  if (this->OnScreenInitialized)
  {
    this->OnScreenInitialized = 0;
    this->DestroyWindow();
  }
}

//----------------------------------------------------------------------------
void vtkCocoaRenderWindow::DestroyWindow()
{
  // finish OpenGL rendering
  if (this->OwnContext && this->GetContextId())
  {
    this->MakeCurrent();
  }
  this->ReleaseGraphicsResources(this);
  this->SetContextId(nullptr);
  this->SetPixelFormat(nullptr);

  vtkCocoaServer* server = (vtkCocoaServer*)this->GetCocoaServer();
  [server stopObservations];
  this->SetCocoaServer(nullptr);

  // If we created it, close the NSWindow.
  if (this->WindowCreated)
  {
    NSWindow* window = (NSWindow*)this->GetRootWindow();
    [window close];
  }

  this->SetWindowId(nullptr);
  this->SetParentId(nullptr);
  this->SetRootWindow(nullptr);
  this->WindowCreated = 0;
  this->ViewCreated = 0;
  this->Mapped = 0;
}

//----------------------------------------------------------------------------
void vtkCocoaRenderWindow::SetWindowName(const char* arg)
{
  vtkWindow::SetWindowName(arg);
  NSWindow* win = (NSWindow*)this->GetRootWindow();
  if (win)
  {
    NSString* winTitleStr = arg ? [NSString stringWithUTF8String:arg] : @"";
    [win setTitle:winTitleStr];
  }
}

//----------------------------------------------------------------------------
bool vtkCocoaRenderWindow::InitializeFromCurrentContext()
{
  NSOpenGLContext* currentContext = [NSOpenGLContext currentContext];
  if (currentContext != nullptr)
  {
    this->SetContextId(currentContext);
    this->SetPixelFormat([currentContext pixelFormat]);

    return this->Superclass::InitializeFromCurrentContext();
  }
  return false;
}

//----------------------------------------------------------------------------
vtkTypeBool vtkCocoaRenderWindow::GetEventPending()
{
  return 0;
}

//----------------------------------------------------------------------------
void vtkCocoaRenderWindow::MakeCurrent()
{
  if (this->GetContextId())
  {
    [(NSOpenGLContext*)this->GetContextId() makeCurrentContext];
  }
}

//----------------------------------------------------------------------------
void vtkCocoaRenderWindow::ReleaseCurrent()
{
  [NSOpenGLContext clearCurrentContext];
}

//----------------------------------------------------------------------------
void vtkCocoaRenderWindow::PushContext()
{
  NSOpenGLContext* current = [NSOpenGLContext currentContext];
  NSOpenGLContext* mine = static_cast<NSOpenGLContext*>(this->GetContextId());
  this->ContextStack.push(current);
  if (current != mine)
  {
    this->MakeCurrent();
  }
}

//----------------------------------------------------------------------------
void vtkCocoaRenderWindow::PopContext()
{
  NSOpenGLContext* current = [NSOpenGLContext currentContext];
  NSOpenGLContext* target = static_cast<NSOpenGLContext*>(this->ContextStack.top());
  this->ContextStack.pop();
  if (target != current)
  {
    [target makeCurrentContext];
  }
}

// ----------------------------------------------------------------------------
// Description:
// Tells if this window is the current OpenGL context for the calling thread.
bool vtkCocoaRenderWindow::IsCurrent()
{
  bool result = false;
  if (this->GetContextId() != nullptr)
  {
    result =
      static_cast<NSOpenGLContext*>(this->GetContextId()) == [NSOpenGLContext currentContext];
  }
  return result;
}

//----------------------------------------------------------------------------
void vtkCocoaRenderWindow::UpdateContext()
{
  if (this->GetContextId())
  {
    [(NSOpenGLContext*)this->GetContextId() update];
  }
}

//----------------------------------------------------------------------------
const char* vtkCocoaRenderWindow::ReportCapabilities()
{
  this->MakeCurrent();

  const char* glVendor = (const char*)glGetString(GL_VENDOR);
  const char* glRenderer = (const char*)glGetString(GL_RENDERER);
  const char* glVersion = (const char*)glGetString(GL_VERSION);

  std::ostringstream strm;
  strm << "OpenGL vendor string:  " << glVendor << "\nOpenGL renderer string:  " << glRenderer
       << "\nOpenGL version string:  " << glVersion << endl;

  strm << "OpenGL extensions:  " << endl;
  GLint n, i;
  glGetIntegerv(GL_NUM_EXTENSIONS, &n);
  for (i = 0; i < n; i++)
  {
    const char* ext = (const char*)glGetStringi(GL_EXTENSIONS, i);
    strm << "  " << ext << endl;
  }

  // Obtain the OpenGL context in order to keep track of the current screen.
  NSOpenGLContext* context = (NSOpenGLContext*)this->GetContextId();
  GLint currentScreen = [context currentVirtualScreen];

  // The NSOpenGLPixelFormat can only be queried for one particular
  // attribute at a time. Just make repeated queries to get the
  // pertinent settings.
  NSOpenGLPixelFormat* pixelFormat = (NSOpenGLPixelFormat*)this->GetPixelFormat();
  strm << "PixelFormat Descriptor:" << endl;
  GLint pfd = 0;
  [pixelFormat getValues:&pfd forAttribute:NSOpenGLPFAColorSize forVirtualScreen:currentScreen];
  strm << "  colorSize:  " << pfd << endl;

  [pixelFormat getValues:&pfd forAttribute:NSOpenGLPFAAlphaSize forVirtualScreen:currentScreen];
  strm << "  alphaSize:  " << pfd << endl;

  [pixelFormat getValues:&pfd forAttribute:NSOpenGLPFAStencilSize forVirtualScreen:currentScreen];
  strm << "  stencilSize:  " << pfd << endl;

  [pixelFormat getValues:&pfd forAttribute:NSOpenGLPFADepthSize forVirtualScreen:currentScreen];
  strm << "  depthSize:  " << pfd << endl;

  [pixelFormat getValues:&pfd forAttribute:NSOpenGLPFAAccumSize forVirtualScreen:currentScreen];
  strm << "  accumSize:  " << pfd << endl;

  [pixelFormat getValues:&pfd forAttribute:NSOpenGLPFADoubleBuffer forVirtualScreen:currentScreen];
  strm << "  double buffer:  " << (pfd == 0 ? "No" : "Yes") << endl;

  // "NSOpenGLPFAStereo" is deprecated in the 10.12 SDK, suppress warning about its use.
  // No explanation is given for the deprecation, and no alternative is suggested.
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
  [pixelFormat getValues:&pfd forAttribute:NSOpenGLPFAStereo forVirtualScreen:currentScreen];
  strm << "  stereo:  " << (pfd == 0 ? "No" : "Yes") << endl;
#pragma clang diagnostic pop

  [pixelFormat getValues:&pfd forAttribute:NSOpenGLPFAStencilSize forVirtualScreen:currentScreen];
  strm << "  stencil:  " << pfd << endl;

  [pixelFormat getValues:&pfd forAttribute:NSOpenGLPFAAccelerated forVirtualScreen:currentScreen];
  strm << "  hardware acceleration:  " << (pfd == 0 ? "No" : "Yes") << endl;

  [pixelFormat getValues:&pfd forAttribute:NSOpenGLPFAOpenGLProfile forVirtualScreen:currentScreen];
  strm << "  profile version:  0x" << std::hex << pfd << endl;

  delete[] this->Capabilities;

  size_t len = strm.str().length() + 1;
  this->Capabilities = new char[len];
  strlcpy(this->Capabilities, strm.str().c_str(), len);

  return this->Capabilities;
}

//----------------------------------------------------------------------------
vtkTypeBool vtkCocoaRenderWindow::IsDirect()
{
  this->MakeCurrent();
  if (!this->GetContextId() || !this->GetPixelFormat())
  {
    return 0;
  }
  return 1;
}

//----------------------------------------------------------------------------
void vtkCocoaRenderWindow::SetSize(int width, int height)
{
  static bool resizing = false;

  if ((this->Size[0] != width) || (this->Size[1] != height) || this->GetParentId())
  {
    this->Superclass::SetSize(width, height);

    if (this->Mapped && !this->UseOffScreenBuffers && this->GetParentId() && this->GetWindowId() &&
      this->GetViewCreated())
    {
      // Set the NSView size, not the window size.
      if (!resizing)
      {
        resizing = true;

        // Get the NSView's current frame (in points).
        NSView* theView = (NSView*)this->GetWindowId();
        NSRect viewRect = [theView frame];

        // Convert the given new size from pixels to points.
        NSSize backingNewSize = NSMakeSize((CGFloat)width, (CGFloat)height);
        NSSize newSize = [theView convertSizeFromBacking:backingNewSize];

        // Test that there's actually a change so as not to recurse into viewFrameDidChange:.
        if (!NSEqualSizes(newSize, viewRect.size))
        {
          // Update the view's frame (in points) keeping the bottom-left
          // corner in the same place.
          CGFloat oldHeight = NSHeight(viewRect);
          CGFloat xpos = NSMinX(viewRect);
          CGFloat ypos = NSMinY(viewRect) - (newSize.height - oldHeight);
          NSRect newRect = NSMakeRect(xpos, ypos, newSize.width, newSize.height);
          [theView setFrame:newRect];
          [theView setNeedsDisplay:YES];
        }

        resizing = false;
      }
    }
    else if (this->Mapped && !this->UseOffScreenBuffers && this->GetRootWindow() &&
      this->GetWindowCreated())
    {
      if (!resizing)
      {
        resizing = true;

        NSWindow* window = (NSWindow*)this->GetRootWindow();
        NSView* theView = (NSView*)this->GetWindowId();

        // Convert the given new size from pixels to points.
        NSRect backingNewRect = NSMakeRect(0.0, 0.0, (CGFloat)width, (CGFloat)height);
        NSRect newRect = [window convertRectFromBacking:backingNewRect];

        // Test that there's actually a change so as not to recurse into viewFrameDidChange:.
        if (!NSEqualSizes(newRect.size, [window frame].size))
        {
          // Set the window size and the view size.
          [window setContentSize:newRect.size];
          [theView setFrame:newRect];
          [theView setNeedsDisplay:YES];
        }

        resizing = false;
      }
    }
  }
}

//----------------------------------------------------------------------------
void vtkCocoaRenderWindow::SetForceMakeCurrent()
{
  this->ForceMakeCurrent = 1;
}

//----------------------------------------------------------------------------
void vtkCocoaRenderWindow::SetPosition(int x, int y)
{
  static bool resizing = false;

  if ((this->Position[0] != x) || (this->Position[1] != y) || this->GetParentId())
  {
    this->Modified();
    this->Position[0] = x;
    this->Position[1] = y;
    if (this->Mapped && this->GetParentId() && this->GetWindowId() && this->GetViewCreated())
    {
      // Set the NSView position relative to the parent
      if (!resizing)
      {
        resizing = true;

        // Get the NSView's current frame (in points).
        NSView* parent = (NSView*)this->GetParentId();
        NSRect parentRect = [parent frame];

        NSView* theView = (NSView*)this->GetWindowId();
        NSRect viewRect = [theView frame];

        // Convert the given new position from pixels to points.
        NSPoint backingNewPosition = NSMakePoint((CGFloat)x, (CGFloat)y);
        NSPoint newPosition = [theView convertPointFromBacking:backingNewPosition];

        // Update the view's frameOrigin (in points) keeping the bottom-left
        // corner in the same place.
        CGFloat parentHeight = NSHeight(parentRect);
        CGFloat height = NSHeight(viewRect);
        CGFloat xpos = newPosition.x;
        CGFloat ypos = parentHeight - height - newPosition.y;
        NSPoint origin = NSMakePoint(xpos, ypos);

        // Test that there's actually a change so as not to recurse into viewFrameDidChange:.
        if (!NSEqualPoints(viewRect.origin, origin))
        {
          [theView setFrameOrigin:origin];
          [theView setNeedsDisplay:YES];
        }

        resizing = false;
      }
    }
    else if (this->Mapped && this->GetRootWindow() && this->GetWindowCreated())
    {
      if (!resizing)
      {
        resizing = true;

        NSWindow* window = (NSWindow*)this->GetRootWindow();

        // Convert the given new position from pixels to points.
        // We use a dummy NSRect because NSWindow doesn't have convertPointFromBacking: before
        // macOS 10.14.
        NSRect backingNewPosition = NSMakeRect((CGFloat)x, (CGFloat)y, 0.0, 0.0);
        NSRect newPosition = [window convertRectFromBacking:backingNewPosition];

        // Test that there's actually a change so as not to recurse into viewFrameDidChange:.
        if (!NSEqualPoints([window frame].origin, newPosition.origin))
        {
          [window setFrameOrigin:newPosition.origin];
        }

        resizing = false;
      }
    }
  }
}

//----------------------------------------------------------------------------
// End the rendering process and display the image.
void vtkCocoaRenderWindow::Frame()
{
  this->MakeCurrent();
  this->Superclass::Frame();

  if (!this->AbortRender && this->DoubleBuffer && this->SwapBuffers)
  {
    [(NSOpenGLContext*)this->GetContextId() flushBuffer];
  }
}

//----------------------------------------------------------------------------
// Specify various window parameters.
void vtkCocoaRenderWindow::WindowConfigure()
{
  // this is all handled by the desiredVisualInfo method
}

//----------------------------------------------------------------------------
void vtkCocoaRenderWindow::SetupPixelFormat(void*, void*, int, int, int)
{
  vtkErrorMacro(<< "vtkCocoaRenderWindow::SetupPixelFormat - IMPLEMENT");
}

//----------------------------------------------------------------------------
void vtkCocoaRenderWindow::SetupPalette(void*)
{
  vtkErrorMacro(<< "vtkCocoaRenderWindow::SetupPalette - IMPLEMENT");
}

//----------------------------------------------------------------------------
// Initialize the window for rendering.
void vtkCocoaRenderWindow::CreateAWindow()
{
  static unsigned count = 1;

  // As vtk is both crossplatform and a library, we don't know if it is being
  // used in a 'regular Cocoa application' or as a 'pure vtk application'.
  // By the former I mean a regular Cocoa application that happens to have
  // a vtkCocoaGLView, by the latter I mean an application that only uses
  // vtk APIs (which happen to use Cocoa as an implementation detail).
  // Specifically, we can't know if NSApplicationMain() was ever called
  // (which is usually done in main()), nor whether the NSApplication exists.
  //
  // So here we call +sharedApplication which will create the NSApplication
  // if it does not exist.  If it does exist, this does nothing.
  // This call is intentionally delayed until this CreateAWindow call
  // to prevent Cocoa-window related stuff from happening in scenarios
  // where vtkRenderWindows are created but never shown.
  NSApplication* app = [NSApplication sharedApplication];

  // Create the NSOpenGLPixelFormat and NSOpenGLContext.
  this->CreateGLContext();

  // create an NSWindow only if neither an NSView nor an NSWindow have
  // been specified already.  This is the case for a 'pure vtk application'.
  // If you are using vtk in a 'regular Mac application' you should call
  // SetRootWindow() and SetWindowId() so that a window is not created here.
  if (!this->GetRootWindow() && !this->GetWindowId() && !this->GetParentId())
  {
    // Ordinarily, only .app bundles get proper mouse and keyboard interaction,
    // but here we change the 'activation policy' to behave as if we were a
    // .app bundle (which we may or may not be).
    (void)[app setActivationPolicy:NSApplicationActivationPolicyRegular];

    NSWindow* theWindow = nil;

    // Revert to main screen if specified screen isn't available.
    NSScreen* screen;
    NSArray* allScreens = [NSScreen screens];
    if (this->DisplayIndex >= 0 && (NSUInteger)this->DisplayIndex < [allScreens count])
    {
      screen = [allScreens objectAtIndex:this->DisplayIndex];
    }
    else
    {
      screen = [NSScreen mainScreen];
    }

    // Get the screen's size (in points).  (If there's no screen, the
    // rectangle will become all zeros and not used anyway.)
    NSRect screenRect = [screen frame];

    // Convert from points to pixels.
    NSRect backingScreenRect = [screen convertRectToBacking:screenRect];

    if (this->FullScreen && screen)
    {
      this->Size[0] = static_cast<int>(NSWidth(backingScreenRect));
      this->Size[1] = static_cast<int>(NSHeight(backingScreenRect));

      // Create an NSWindow with the screen's full size (in points, not pixels).
      theWindow = [[vtkCocoaFullScreenWindow alloc] initWithContentRect:screenRect
                                                              styleMask:NSWindowStyleMaskBorderless
                                                                backing:NSBackingStoreBuffered
                                                                  defer:NO];

      // This will hide the menu and the dock
      [theWindow setLevel:NSMainMenuWindowLevel + 1];
      // This will show the menu and the dock
      //[theWindow setLevel:NSFloatingWindowLevel];
    }
    else
    {
      if ((this->Size[0] + this->Size[1]) == 0)
      {
        this->Size[0] = 300;
        this->Size[1] = 300;
      }
      if ((this->Position[0] + this->Position[1]) == 0)
      {
        this->Position[0] = 50;
        this->Position[1] = 50;
      }

      NSRect backingContentRect = NSMakeRect((CGFloat)this->Position[0], (CGFloat)this->Position[1],
        (CGFloat)this->Size[0], (CGFloat)this->Size[1]);

      // Convert from pixels to points.
      NSRect contentRect;
      if (screen)
      {
        contentRect = [screen convertRectFromBacking:backingContentRect];
      }
      else
      {
        contentRect = backingContentRect;
      }

      NSWindowStyleMask styleMask = (NSWindowStyleMaskTitled | NSWindowStyleMaskClosable |
        NSWindowStyleMaskMiniaturizable | NSWindowStyleMaskResizable);
      theWindow = [[NSWindow alloc] initWithContentRect:contentRect
                                              styleMask:styleMask
                                                backing:NSBackingStoreBuffered
                                                  defer:NO];
    }

    if (!theWindow)
    {
      vtkErrorMacro("Could not create window, serious error!");
      return;
    }

    this->SetRootWindow(theWindow);
    this->WindowCreated = 1;

    // Since we created the NSWindow, give it a title.
    NSString* winName = [NSString stringWithFormat:@"Visualization Toolkit - Cocoa #%u", count++];
    this->SetWindowName([winName UTF8String]);

    // makeKeyAndOrderFront: will show the window
    if (this->ShowWindow)
    {
      [theWindow makeKeyAndOrderFront:nil];
      [theWindow setAcceptsMouseMovedEvents:YES];
    }
  }

  // create an NSView if one has not been specified
  if (!this->GetWindowId())
  {
    // For NSViews that display OpenGL, the OS defaults to drawing magnified,
    // not in high resolution. There is a tradeoff here between better visual
    // quality vs memory use and processing time. VTK decides on the opposite
    // default and enables best resolution by default. It does so partly because
    // the system python sets NSHighResolutionCapable in this file:
    // /System/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/Info.plist
    // If you want magnified drawing instead, call SetWantsBestResolution(false)
    bool wantsBest = this->GetWantsBestResolution();

    if (this->GetParentId())
    {
      // Get the NSView's current frame (in points).
      NSView* parent = (NSView*)this->GetParentId();
      NSRect parentRect = [parent frame];
      CGFloat parentHeight = NSHeight(parentRect);
      CGFloat parentWidth = NSWidth(parentRect);

      // Convert from pixels to points.
      NSWindow* window = [parent window];
      assert(window);
      NSRect backingViewRect = NSMakeRect((CGFloat)this->Position[0], (CGFloat)this->Position[1],
        (CGFloat)this->Size[0], (CGFloat)this->Size[1]);
      NSRect viewRect = [window convertRectFromBacking:backingViewRect];

      CGFloat width = NSWidth(viewRect);
      CGFloat height = NSHeight(viewRect);
      CGFloat x = NSMinX(viewRect);
      CGFloat y = parentHeight - height - NSMinY(viewRect);

      // A whole bunch of sanity checks: frame must be inside parent
      if (x > parentWidth - 1)
      {
        x = parentWidth - 1;
      }
      if (y > parentHeight - 1)
      {
        y = parentHeight - 1;
      }
      if (x < 0.0)
      {
        x = 0.0;
      }
      if (y < 0.0)
      {
        y = 0.0;
      }
      if (x + width > parentWidth)
      {
        width = parentWidth - x;
      }
      if (y + height > parentWidth)
      {
        height = parentHeight - y;
      }

      // Don't use vtkCocoaGLView, because if we are in Tk (which is what
      // SetParentId() was added for) then the Tk superview handles the events.
      NSRect glRect = NSMakeRect(x, y, width, height);
      NSView* glView = [[NSView alloc] initWithFrame:glRect];
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
      [glView setWantsBestResolutionOpenGLSurface:wantsBest];
#pragma clang diagnostic pop
      [parent addSubview:glView];
      this->SetWindowId(glView);
      this->ViewCreated = 1;

#if !VTK_OBJC_IS_ARC
      [glView release];
#endif
    }
    else
    {
      NSRect backingViewRect = NSMakeRect(0.0, 0.0, (CGFloat)this->Size[0], (CGFloat)this->Size[1]);

      // Convert from points to pixels.
      NSWindow* window = (NSWindow*)this->GetRootWindow();
      assert(window);
      NSRect viewRect = [window convertRectFromBacking:backingViewRect];

      // Create a vtkCocoaGLView.
      vtkCocoaGLView* glView = [[vtkCocoaGLView alloc] initWithFrame:viewRect];
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
      [glView setWantsBestResolutionOpenGLSurface:wantsBest];
#pragma clang diagnostic pop
      [window setContentView:glView];
      // We have to set the frame's view rect again to work around rounding
      // that occurs when setting the window's content view.
      [glView setFrame:viewRect];
      this->SetWindowId(glView);
      this->ViewCreated = 1;
      [glView setVTKRenderWindow:this];

#if !VTK_OBJC_IS_ARC
      [glView release];
#endif
    }
  }

  // Link the NSOpenGLContext and NSView, unless instructed not to.
  NSOpenGLContext* context = (NSOpenGLContext*)this->GetContextId();
  bool connectContextToNSView = this->GetConnectContextToNSView();
  if (connectContextToNSView)
  {
    NSView* view = (NSView*)this->GetWindowId();
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
    [context setView:view];
#pragma clang diagnostic pop
  }

  // the error "invalid drawable" in the console from this call can appear
  // but only early in the app's lifetime (ie sometime during launch)
  // IMPORTANT: this is necessary to update the context here in case of
  // hardware offscreen rendering.
  [context update];

  this->MakeCurrent();

  // wipe out any existing display lists
  vtkRenderer* renderer = nullptr;
  vtkCollectionSimpleIterator rsit;

  for (this->Renderers->InitTraversal(rsit); (renderer = this->Renderers->GetNextRenderer(rsit));)
  {
    renderer->SetRenderWindow(nullptr);
    renderer->SetRenderWindow(this);
  }
  this->OpenGLInit();
  this->Mapped = 1;

  // Now that the NSView and NSWindow exist, the vtkCocoaServer can start its observations.
  vtkCocoaServer* server = [[vtkCocoaServer alloc] initWithRenderWindow:this];
  this->SetCocoaServer(reinterpret_cast<void*>(server));
  [server startObservations];
#if !VTK_OBJC_IS_ARC
  [server release];
#endif
}

//----------------------------------------------------------------------------
void vtkCocoaRenderWindow::CreateGLContext()
{
  // If the deployment target is at least 10.10, prefer the 'OpenGL 4.1 Core
  // Implementation', otherwise we'll fall back to the 'OpenGL 3.2 Core
  // Implementation' (available since 10.7).
  NSOpenGLPixelFormatAttribute profileVersion;
#if MAC_OS_X_VERSION_MIN_REQUIRED >= 101000
  profileVersion = NSOpenGLProfileVersion4_1Core;
#else
  profileVersion = NSOpenGLProfileVersion3_2Core;
#endif

  // Prefer hardware acceleration
  NSOpenGLPixelFormatAttribute hardware = NSOpenGLPFAAccelerated;

  // keep trying to get different pixelFormats until successful
  NSOpenGLPixelFormat* pixelFormat = nil;
  while (pixelFormat == nil)
  {
    int i = 0;
    NSOpenGLPixelFormatAttribute attribs[20];

    attribs[i++] = NSOpenGLPFAOpenGLProfile;
    attribs[i++] = profileVersion;

    attribs[i++] = NSOpenGLPFADepthSize;
    attribs[i++] = (NSOpenGLPixelFormatAttribute)32;

    if (this->DoubleBuffer != 0)
    {
      attribs[i++] = NSOpenGLPFADoubleBuffer;
    }

    if (this->StencilCapable)
    {
      attribs[i++] = NSOpenGLPFAStencilSize;
      attribs[i++] = (NSOpenGLPixelFormatAttribute)8;
    }

    // must be last in case it is 0
    attribs[i++] = hardware;

    // zero termination of list
    attribs[i++] = (NSOpenGLPixelFormatAttribute)0;

    // make sure that size of array was not exceeded
    assert(sizeof(NSOpenGLPixelFormatAttribute) * i < sizeof(attribs));

    pixelFormat = [[NSOpenGLPixelFormat alloc] initWithAttributes:attribs];

    if (pixelFormat == nil)
    {
      if (profileVersion != NSOpenGLProfileVersion3_2Core)
      {
        // Try falling back to the 3.2 Core Profile
        profileVersion = NSOpenGLProfileVersion3_2Core;
      }
      else if (hardware == NSOpenGLPFAAccelerated)
      {
        // Try falling back to the software renderer
        hardware = 0;
      }
      else
      {
        vtkWarningMacro(<< "No OpenGL context whatsoever could be created!");
        break;
      }
    }
  }

  // do we have a shared render window?
  NSOpenGLContext* sharedContext = nil;
  if (this->SharedRenderWindow)
  {
    vtkCocoaRenderWindow* renWin = vtkCocoaRenderWindow::SafeDownCast(this->SharedRenderWindow);
    if (renWin && renWin->GetContextId())
    {
      sharedContext = (NSOpenGLContext*)renWin->GetContextId();
      this->GetState()->SetVBOCache(renWin->GetState()->GetVBOCache());
    }
  }

  NSOpenGLContext* context = nil;
  if (pixelFormat)
  {
    context = [[NSOpenGLContext alloc] initWithFormat:pixelFormat shareContext:sharedContext];

    // This syncs the OpenGL context to the VBL to prevent tearing
    GLint one = 1;
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
    [context setValues:&one forParameter:NSOpenGLCPSwapInterval];
#pragma clang diagnostic pop
  }

  this->SetPixelFormat((void*)pixelFormat);
  this->SetContextId((void*)context);

  [pixelFormat self]; // prevent premature collection under GC.
  [context self];     // prevent premature collection under GC.

#if !VTK_OBJC_IS_ARC
  [pixelFormat release];
  [context release];
#endif
}

//----------------------------------------------------------------------------
// Initialize the rendering process.
void vtkCocoaRenderWindow::Start()
{
  this->Superclass::Start();

  // make sure the hardware is up to date otherwise
  // the backing store may not match the current window
  // no clue what is really going on here but the old code
  // called Initialize every render to do this
  if (this->OnScreenInitialized && this->Mapped)
  {
    // Link the NSOpenGLContext and NSView, unless instructed not to.
    // Although this is done in CreateAWindow, which seems like it should be
    // sufficient, it's still needed in case previous calls to setView: failed
    // to take effect (which can sometimes occur if the view was created externally).
    NSOpenGLContext* context = (NSOpenGLContext*)this->GetContextId();
    bool connectContextToNSView = this->GetConnectContextToNSView();
    if (connectContextToNSView)
    {
      NSView* view = (NSView*)this->GetWindowId();
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
      [context setView:view];
#pragma clang diagnostic pop
    }

    // the error "invalid drawable" in the console from this call can appear
    // but only early in the app's lifetime (ie sometime during launch)
    // IMPORTANT: this is necessary to update the context here in case of
    // onscreen rendering.
    [context update];
  }

  // set the current window
  this->MakeCurrent();
}

//----------------------------------------------------------------------------
// Initialize the rendering window.
void vtkCocoaRenderWindow::Initialize()
{
  if (!this->OnScreenInitialized)
  {
    this->OnScreenInitialized = 1;
    this->CreateAWindow();
  }
}

//----------------------------------------------------------------------------
int* vtkCocoaRenderWindow::GetSize()
{
  // if we aren't mapped then just call super
  if (this->Mapped && !this->UseOffScreenBuffers)
  {
    // We want to return the size of 'the window'.  But the term 'window'
    // is overloaded. It's really the NSView that vtk draws into, so we
    // return its size. If there's no NSView, it will result in zeros.
    NSView* view = (NSView*)this->GetWindowId();

    // Get the NSView's current frame (in points).
    NSRect viewRect = [view frame];

    // Convert from points to pixels.
    NSRect backingViewRect = [view convertRectToBacking:viewRect];

    // Update the ivar.
    this->Size[0] = static_cast<int>(NSWidth(backingViewRect));
    this->Size[1] = static_cast<int>(NSHeight(backingViewRect));
  }

  return this->Superclass::GetSize();
}

//----------------------------------------------------------------------------
// Get the current size of the screen in pixels.
int* vtkCocoaRenderWindow::GetScreenSize()
{
  // Get the NSScreen that the NSView is mostly on.  Either could be nil.
  NSView* view = (NSView*)this->GetWindowId();
  NSWindow* window = [view window];
  NSScreen* screen = [window screen];

  // If screen is nil, then fall back to the screen with index DisplayIndex,
  // which CreateAWindow() also uses (it could be nil too).
  if (!screen)
  {
    NSArray* allScreens = [NSScreen screens];
    if (this->DisplayIndex >= 0 && (NSUInteger)this->DisplayIndex < [allScreens count])
    {
      screen = [allScreens objectAtIndex:this->DisplayIndex];
    }
    else
    {
      screen = [NSScreen mainScreen];
    }
  }

  if (!screen)
  {
    // Revert to main screen if specified screen isn't available.
    screen = [NSScreen mainScreen];
  }

  // Get the screen's size (in points).
  NSRect screenRect = [screen frame];

  // Convert from points to pixels.
  NSRect backingScreenRect = [screen convertRectToBacking:screenRect];

  this->ScreenSize[0] = static_cast<int>(NSWidth(backingScreenRect));
  this->ScreenSize[1] = static_cast<int>(NSHeight(backingScreenRect));

  return this->ScreenSize;
}

//----------------------------------------------------------------------------
// Get the position in screen coordinates of the window.
int* vtkCocoaRenderWindow::GetPosition()
{
  // if we aren't mapped then just return the ivar
  if (!this->Mapped)
  {
    return this->Position;
  }

  NSView* parent = (NSView*)this->GetParentId();
  NSView* view = (NSView*)this->GetWindowId();
  if (parent && view)
  {
    // Get display position of the NSView within its parent (in points).
    NSRect parentRect = [parent frame];
    NSRect viewRect = [view frame];

    // Convert from points to pixels.
    NSRect backingParentRect = [parent convertRectToBacking:parentRect];
    NSRect backingViewRect = [view convertRectToBacking:viewRect];

    this->Position[0] = static_cast<int>(NSMinX(backingViewRect));
    this->Position[1] = static_cast<int>(
      NSHeight(backingParentRect) - NSHeight(backingViewRect) - NSMinY(backingViewRect));
  }
  else
  {
    // We want to return the position of 'the window'.  But the term 'window'
    // is overloaded. In this case, it's the position of the NSWindow itself
    // on the screen that we return. We don't much care where the NSView is
    // within the NSWindow.
    NSWindow* window = (NSWindow*)this->GetRootWindow();
    if (window)
    {
      // Get the NSWindow's current frame (in points).
      NSRect windowRect = [window frame];

      // Convert from points to pixels.
      NSRect backingWindowRect = [window convertRectToBacking:windowRect];

      this->Position[0] = static_cast<int>(NSMinX(backingWindowRect));
      this->Position[1] = static_cast<int>(NSMinY(backingWindowRect));
    }
  }

  return this->Position;
}

//----------------------------------------------------------------------------
// Change the window to fill the entire screen.
void vtkCocoaRenderWindow::SetFullScreen(vtkTypeBool arg)
{
  if (this->FullScreen == arg)
  {
    return;
  }

  if (!this->Mapped)
  {
    this->FullScreen = arg;
    return;
  }

  // set the mode
  this->FullScreen = arg;
  if (this->FullScreen <= 0)
  {
    this->Position[0] = this->OldScreen[0];
    this->Position[1] = this->OldScreen[1];
    this->Size[0] = this->OldScreen[2];
    this->Size[1] = this->OldScreen[3];
    this->Borders = this->OldScreen[4];
  }
  else
  {
    // if window already up get its values
    if (this->GetRootWindow())
    {
      const int* pos = this->GetPosition();
      this->OldScreen[0] = pos[0];
      this->OldScreen[1] = pos[1];

      this->OldScreen[4] = this->Borders;
      this->PrefFullScreen();
    }
  }

  // remap the window
  this->WindowRemap();

  this->Modified();
}

//----------------------------------------------------------------------------
//
// Set the variable that indicates that we want a stereo capable window
// be created. This method can only be called before a window is realized.
//
void vtkCocoaRenderWindow::SetStereoCapableWindow(vtkTypeBool capable)
{
  if (this->GetContextId() == nullptr)
  {
    vtkRenderWindow::SetStereoCapableWindow(capable);
  }
  else
  {
    vtkWarningMacro(<< "Requesting a StereoCapableWindow must be performed "
                    << "before the window is realized, i.e. before a render.");
  }
}

//----------------------------------------------------------------------------
// Set the preferred window size to full screen.
void vtkCocoaRenderWindow::PrefFullScreen()
{
  const int* size = this->GetScreenSize();
  vtkWarningMacro(<< "Can only set FullScreen before showing window: " << size[0] << 'x' << size[1]
                  << ".");
}

//----------------------------------------------------------------------------
// Remap the window.
void vtkCocoaRenderWindow::WindowRemap()
{
  vtkWarningMacro(<< "Can't remap the window.");
  // Acquire the display and capture the screen.
  // Create the full-screen window.
  // Add the context.
}

//----------------------------------------------------------------------------
void vtkCocoaRenderWindow::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os, indent);

  os << indent << "CocoaManager: " << this->GetCocoaManager() << endl;
  os << indent << "RootWindow (NSWindow): " << this->GetRootWindow() << endl;
  os << indent << "WindowId (NSView): " << this->GetWindowId() << endl;
  os << indent << "ParentId (NSView): " << this->GetParentId() << endl;
  os << indent << "ContextId: " << this->GetContextId() << endl;
  os << indent << "PixelFormat: " << this->GetPixelFormat() << endl;
  os << indent << "WindowCreated: " << (this->GetWindowCreated() ? "Yes" : "No") << endl;
  os << indent << "ViewCreated: " << (this->GetViewCreated() ? "Yes" : "No") << endl;
  os << indent << "WantsBestResolution: " << (this->GetWantsBestResolution() ? "Yes" : "No")
     << endl;
}

//----------------------------------------------------------------------------
// Returns the NSWindow* associated with this vtkRenderWindow.
void* vtkCocoaRenderWindow::GetRootWindow()
{
  NSMutableDictionary* manager = reinterpret_cast<NSMutableDictionary*>(this->GetCocoaManager());
  return reinterpret_cast<void*>([manager objectForKey:@"RootWindow"]);
}

//----------------------------------------------------------------------------
// Sets the NSWindow* associated with this vtkRenderWindow.
void vtkCocoaRenderWindow::SetRootWindow(void* arg)
{
  if (arg != nullptr)
  {
    NSMutableDictionary* manager = reinterpret_cast<NSMutableDictionary*>(this->GetCocoaManager());
    [manager setObject:reinterpret_cast<id>(arg) forKey:@"RootWindow"];
  }
  else
  {
    NSMutableDictionary* manager = reinterpret_cast<NSMutableDictionary*>(this->GetCocoaManager());
    [manager removeObjectForKey:@"RootWindow"];
  }
}

//----------------------------------------------------------------------------
// Returns the NSView* associated with this vtkRenderWindow.
void* vtkCocoaRenderWindow::GetWindowId()
{
  NSMutableDictionary* manager = reinterpret_cast<NSMutableDictionary*>(this->GetCocoaManager());
  return reinterpret_cast<void*>([manager objectForKey:@"WindowId"]);
}

//----------------------------------------------------------------------------
// Sets the NSView* associated with this vtkRenderWindow.
void vtkCocoaRenderWindow::SetWindowId(void* arg)
{
  if (arg != nullptr)
  {
    NSMutableDictionary* manager = reinterpret_cast<NSMutableDictionary*>(this->GetCocoaManager());
    [manager setObject:reinterpret_cast<id>(arg) forKey:@"WindowId"];
  }
  else
  {
    NSMutableDictionary* manager = reinterpret_cast<NSMutableDictionary*>(this->GetCocoaManager());
    [manager removeObjectForKey:@"WindowId"];
  }
}

//----------------------------------------------------------------------------
// Returns the NSView* that is the parent of this vtkRenderWindow.
void* vtkCocoaRenderWindow::GetParentId()
{
  NSMutableDictionary* manager = reinterpret_cast<NSMutableDictionary*>(this->GetCocoaManager());
  return reinterpret_cast<void*>([manager objectForKey:@"ParentId"]);
}

//----------------------------------------------------------------------------
// Sets the NSView* that this vtkRenderWindow should use as a parent.
void vtkCocoaRenderWindow::SetParentId(void* arg)
{
  if (arg != nullptr)
  {
    NSMutableDictionary* manager = reinterpret_cast<NSMutableDictionary*>(this->GetCocoaManager());
    [manager setObject:reinterpret_cast<id>(arg) forKey:@"ParentId"];
  }
  else
  {
    NSMutableDictionary* manager = reinterpret_cast<NSMutableDictionary*>(this->GetCocoaManager());
    [manager removeObjectForKey:@"ParentId"];
  }
}

//----------------------------------------------------------------------------
// Sets the NSOpenGLContext* associated with this vtkRenderWindow.
void vtkCocoaRenderWindow::SetContextId(void* contextId)
{
  if (contextId != nullptr)
  {
    NSMutableDictionary* manager = reinterpret_cast<NSMutableDictionary*>(this->GetCocoaManager());
    [manager setObject:reinterpret_cast<id>(contextId) forKey:@"ContextId"];
  }
  else
  {
    NSMutableDictionary* manager = reinterpret_cast<NSMutableDictionary*>(this->GetCocoaManager());
    [manager removeObjectForKey:@"ContextId"];
  }
}

//----------------------------------------------------------------------------
// Returns the NSOpenGLContext* associated with this vtkRenderWindow.
void* vtkCocoaRenderWindow::GetContextId()
{
  NSMutableDictionary* manager = reinterpret_cast<NSMutableDictionary*>(this->GetCocoaManager());
  return reinterpret_cast<void*>([manager objectForKey:@"ContextId"]);
}

//----------------------------------------------------------------------------
// Sets the NSOpenGLPixelFormat* associated with this vtkRenderWindow.
void vtkCocoaRenderWindow::SetPixelFormat(void* pixelFormat)
{
  if (pixelFormat != nullptr)
  {
    NSMutableDictionary* manager = reinterpret_cast<NSMutableDictionary*>(this->GetCocoaManager());
    [manager setObject:reinterpret_cast<id>(pixelFormat) forKey:@"PixelFormat"];
  }
  else
  {
    NSMutableDictionary* manager = reinterpret_cast<NSMutableDictionary*>(this->GetCocoaManager());
    [manager removeObjectForKey:@"PixelFormat"];
  }
}

//----------------------------------------------------------------------------
// Returns the NSOpenGLPixelFormat* associated with this vtkRenderWindow.
void* vtkCocoaRenderWindow::GetPixelFormat()
{
  NSMutableDictionary* manager = reinterpret_cast<NSMutableDictionary*>(this->GetCocoaManager());
  return reinterpret_cast<void*>([manager objectForKey:@"PixelFormat"]);
}

//----------------------------------------------------------------------------
void vtkCocoaRenderWindow::SetCocoaServer(void* server)
{
  if (server != nullptr)
  {
    NSMutableDictionary* manager = reinterpret_cast<NSMutableDictionary*>(this->GetCocoaManager());
    [manager setObject:reinterpret_cast<vtkCocoaServer*>(server) forKey:@"CocoaServer"];
  }
  else
  {
    NSMutableDictionary* manager = reinterpret_cast<NSMutableDictionary*>(this->GetCocoaManager());
    [manager removeObjectForKey:@"CocoaServer"];
  }
}

//----------------------------------------------------------------------------
void* vtkCocoaRenderWindow::GetCocoaServer()
{
  NSMutableDictionary* manager = reinterpret_cast<NSMutableDictionary*>(this->GetCocoaManager());
  return reinterpret_cast<void*>([manager objectForKey:@"CocoaServer"]);
}

//----------------------------------------------------------------------------
void vtkCocoaRenderWindow::SetCocoaManager(void* manager)
{
  NSMutableDictionary* currentCocoaManager =
    reinterpret_cast<NSMutableDictionary*>(this->CocoaManager);
  NSMutableDictionary* newCocoaManager = reinterpret_cast<NSMutableDictionary*>(manager);

  if (currentCocoaManager != newCocoaManager)
  {
    // Why not use Cocoa's retain and release?  Without garbage collection
    // (GC), the two are equivalent anyway because of 'toll free bridging',
    // so no problem there.  With GC, retain and release do nothing, but
    // CFRetain and CFRelease still manipulate the internal reference count.
    // We need that, since we are not using strong references (we don't want
    // it collected out from under us!).
    if (currentCocoaManager)
    {
      CFRelease(currentCocoaManager);
    }
    if (newCocoaManager)
    {
      this->CocoaManager = const_cast<void*>(CFRetain(newCocoaManager));
    }
    else
    {
      this->CocoaManager = nullptr;
    }
  }
}

//----------------------------------------------------------------------------
void vtkCocoaRenderWindow::SetWindowInfo(const char* info)
{
  // The parameter is an ASCII string of a decimal number representing
  // a pointer to the window. Convert it back to a pointer.
  ptrdiff_t tmp = 0;
  if (info)
  {
    (void)sscanf(info, "%tu", &tmp);
  }

  this->SetWindowId(reinterpret_cast<void*>(tmp));
}

//----------------------------------------------------------------------------
void vtkCocoaRenderWindow::SetParentInfo(const char* info)
{
  // The parameter is an ASCII string of a decimal number representing
  // a pointer to the window. Convert it back to a pointer.
  ptrdiff_t tmp = 0;
  if (info)
  {
    (void)sscanf(info, "%tu", &tmp);
  }

  this->SetParentId(reinterpret_cast<void*>(tmp));
}

//----------------------------------------------------------------------------
void* vtkCocoaRenderWindow::GetCocoaManager()
{
  return this->CocoaManager;
}

//----------------------------------------------------------------------------
void vtkCocoaRenderWindow::HideCursor()
{
  if (this->CursorHidden)
  {
    return;
  }
  this->CursorHidden = 1;

  [NSCursor hide];
}

//----------------------------------------------------------------------------
void vtkCocoaRenderWindow::ShowCursor()
{
  if (!this->CursorHidden)
  {
    return;
  }
  this->CursorHidden = 0;

  [NSCursor unhide];
}

// ---------------------------------------------------------------------------
vtkTypeBool vtkCocoaRenderWindow::GetViewCreated()
{
  return this->ViewCreated;
}

// ---------------------------------------------------------------------------
vtkTypeBool vtkCocoaRenderWindow::GetWindowCreated()
{
  return this->WindowCreated;
}

//----------------------------------------------------------------------------
void vtkCocoaRenderWindow::SetCursorPosition(int x, int y)
{
  // The given coordinates are from the bottom left of the view.
  NSPoint newViewPoint = NSMakePoint(x, y);

  // Convert to screen coordinates.
  NSView* view = (NSView*)this->GetWindowId();
  if (view)
  {
    NSPoint screenPoint = [view convertPoint:newViewPoint toView:nil];
    CGPoint newCursorPosition = NSPointToCGPoint(screenPoint);

    // Move the cursor there.
    (void)CGWarpMouseCursorPosition(newCursorPosition);
  }
}

//----------------------------------------------------------------------------
void vtkCocoaRenderWindow::SetCurrentCursor(int shape)
{
  if (this->InvokeEvent(vtkCommand::CursorChangedEvent, &shape))
  {
    return;
  }
  this->Superclass::SetCurrentCursor(shape);

  if (!this->Mapped)
  {
    return;
  }

  NSCursor* cursor = nil;
  switch (shape)
  {
    case VTK_CURSOR_DEFAULT:
    case VTK_CURSOR_CUSTOM:
    case VTK_CURSOR_ARROW:
      cursor = [NSCursor arrowCursor];
      break;
    case VTK_CURSOR_SIZENS:
      cursor = [NSCursor resizeUpDownCursor];
      break;
    case VTK_CURSOR_SIZEWE:
      cursor = [NSCursor resizeLeftRightCursor];
      break;
    case VTK_CURSOR_HAND:
      cursor = [NSCursor pointingHandCursor];
      break;
    case VTK_CURSOR_CROSSHAIR:
      cursor = [NSCursor crosshairCursor];
      break;

    // NSCursor does not have cursors for these.
    case VTK_CURSOR_SIZENE:
    case VTK_CURSOR_SIZESW:
    case VTK_CURSOR_SIZENW:
    case VTK_CURSOR_SIZESE:
    case VTK_CURSOR_SIZEALL:
      cursor = [NSCursor arrowCursor];
      break;
  }

  [cursor set];
}

//----------------------------------------------------------------------------
bool vtkCocoaRenderWindow::GetWantsBestResolution()
{
  return this->WantsBestResolution;
}

//----------------------------------------------------------------------------
void vtkCocoaRenderWindow::SetWantsBestResolution(bool wantsBest)
{
  this->WantsBestResolution = wantsBest;
}

//----------------------------------------------------------------------------
bool vtkCocoaRenderWindow::GetConnectContextToNSView()
{
  return this->ConnectContextToNSView;
}

//----------------------------------------------------------------------------
void vtkCocoaRenderWindow::SetConnectContextToNSView(bool connect)
{
  this->ConnectContextToNSView = connect;
}
