gecko-dev/dom/src/base/nsBarProps.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * for the specific language governing rights and limitations under the
 * License.
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 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is 
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 * Portions created by the Initial Developer are Copyright (C) 1998
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 *
 * Contributor(s):
 *    Travis Bogard <travis@netscape.com> 
 *
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#include "nsCOMPtr.h"
#include "nscore.h"
#include "nsBarProps.h"
#include "nsGlobalWindow.h"
#include "nsStyleConsts.h"
#include "nsIDocShell.h"
#include "nsIScriptSecurityManager.h"
#include "nsIScrollable.h"
#include "nsIWebBrowserChrome.h"
#include "nsIDOMWindowInternal.h"
#include "nsDOMClassInfo.h"

//
//  Basic (virtual) BarProp class implementation
//
BarPropImpl::BarPropImpl() : mBrowserChrome(nsnull)
{
}

BarPropImpl::~BarPropImpl()
{
}


// QueryInterface implementation for BarPropImpl
NS_INTERFACE_MAP_BEGIN(BarPropImpl)
  NS_INTERFACE_MAP_ENTRY(nsIDOMBarProp)
  NS_INTERFACE_MAP_ENTRY(nsISupports)
  NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO(BarProp)
NS_INTERFACE_MAP_END


NS_IMPL_ADDREF(BarPropImpl)
NS_IMPL_RELEASE(BarPropImpl)


NS_IMETHODIMP
BarPropImpl::SetWebBrowserChrome(nsIWebBrowserChrome* aBrowserChrome)
{
  mBrowserChrome = aBrowserChrome;
  return NS_OK;
}

NS_IMETHODIMP
BarPropImpl::GetVisibleByFlag(PRBool *aVisible, PRUint32 aChromeFlag)
{
  NS_ENSURE_TRUE(mBrowserChrome, NS_ERROR_FAILURE);

  PRUint32 chromeFlags;
  *aVisible = PR_FALSE;

  NS_ENSURE_SUCCESS(mBrowserChrome->GetChromeFlags(&chromeFlags),
                    NS_ERROR_FAILURE);
  if(chromeFlags & aChromeFlag)
    *aVisible = PR_TRUE;

  return NS_OK;
}

NS_IMETHODIMP
BarPropImpl::SetVisibleByFlag(PRBool aVisible, PRUint32 aChromeFlag)
{
  NS_ENSURE_TRUE(mBrowserChrome, NS_ERROR_FAILURE);

  PRBool   enabled = PR_FALSE;

  nsCOMPtr<nsIScriptSecurityManager>
           securityManager(do_GetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID));
  if (securityManager)
    securityManager->IsCapabilityEnabled("UniversalBrowserWrite", &enabled);
  if (!enabled)
    return NS_OK;

  PRUint32 chromeFlags;

  NS_ENSURE_SUCCESS(mBrowserChrome->GetChromeFlags(&chromeFlags),
                    NS_ERROR_FAILURE);
  if(aVisible)
    chromeFlags |= aChromeFlag;
  else
    chromeFlags &= ~aChromeFlag;
  NS_ENSURE_SUCCESS(mBrowserChrome->SetChromeFlags(chromeFlags),
                    NS_ERROR_FAILURE);

  return NS_OK;
}

//
// MenubarProp class implementation
//

MenubarPropImpl::MenubarPropImpl()
{
}

MenubarPropImpl::~MenubarPropImpl()
{
}

NS_IMETHODIMP
MenubarPropImpl::GetVisible(PRBool *aVisible)
{
  return BarPropImpl::GetVisibleByFlag(aVisible,
                                       nsIWebBrowserChrome::CHROME_MENUBAR);
}

NS_IMETHODIMP
MenubarPropImpl::SetVisible(PRBool aVisible)
{
  return BarPropImpl::SetVisibleByFlag(aVisible,
                                       nsIWebBrowserChrome::CHROME_MENUBAR);
}

//
// ToolbarProp class implementation
//

ToolbarPropImpl::ToolbarPropImpl()
{
}

ToolbarPropImpl::~ToolbarPropImpl()
{
}

NS_IMETHODIMP
ToolbarPropImpl::GetVisible(PRBool *aVisible)
{
  return BarPropImpl::GetVisibleByFlag(aVisible,
                                       nsIWebBrowserChrome::CHROME_TOOLBAR);
}

NS_IMETHODIMP
ToolbarPropImpl::SetVisible(PRBool aVisible)
{
  return BarPropImpl::SetVisibleByFlag(aVisible,
                                       nsIWebBrowserChrome::CHROME_TOOLBAR);
}

//
// LocationbarProp class implementation
//

LocationbarPropImpl::LocationbarPropImpl()
{
}

LocationbarPropImpl::~LocationbarPropImpl()
{
}

NS_IMETHODIMP
LocationbarPropImpl::GetVisible(PRBool *aVisible)
{
  return BarPropImpl::GetVisibleByFlag(aVisible, nsIWebBrowserChrome::CHROME_LOCATIONBAR);
}

NS_IMETHODIMP
LocationbarPropImpl::SetVisible(PRBool aVisible)
{
  return BarPropImpl::SetVisibleByFlag(aVisible, nsIWebBrowserChrome::CHROME_LOCATIONBAR);
}

//
// PersonalbarProp class implementation
//

PersonalbarPropImpl::PersonalbarPropImpl()
{
}

PersonalbarPropImpl::~PersonalbarPropImpl()
{
}

NS_IMETHODIMP
PersonalbarPropImpl::GetVisible(PRBool *aVisible)
{
  return BarPropImpl::GetVisibleByFlag(aVisible, nsIWebBrowserChrome::CHROME_PERSONAL_TOOLBAR);
}

NS_IMETHODIMP
PersonalbarPropImpl::SetVisible(PRBool aVisible)
{
  return BarPropImpl::SetVisibleByFlag(aVisible, nsIWebBrowserChrome::CHROME_PERSONAL_TOOLBAR);
}

//
// StatusbarProp class implementation
//

StatusbarPropImpl::StatusbarPropImpl()
{
}

StatusbarPropImpl::~StatusbarPropImpl()
{
}

NS_IMETHODIMP
StatusbarPropImpl::GetVisible(PRBool *aVisible)
{
  return BarPropImpl::GetVisibleByFlag(aVisible,
                                       nsIWebBrowserChrome::CHROME_STATUSBAR);
}

NS_IMETHODIMP
StatusbarPropImpl::SetVisible(PRBool aVisible)
{
  return BarPropImpl::SetVisibleByFlag(aVisible,
                                       nsIWebBrowserChrome::CHROME_STATUSBAR);
}

//
// ScrollbarsProp class implementation
//

ScrollbarsPropImpl::ScrollbarsPropImpl(GlobalWindowImpl *aWindow)
{
  mDOMWindow = aWindow;
  nsISupports *supwin = NS_STATIC_CAST(nsIScriptGlobalObject *, aWindow);
  mDOMWindowWeakref = do_GetWeakReference(supwin);
}

ScrollbarsPropImpl::~ScrollbarsPropImpl()
{
}

NS_IMETHODIMP
ScrollbarsPropImpl::GetVisible(PRBool *aVisible)
{
  *aVisible = PR_TRUE; // one assumes

  nsCOMPtr<nsIDOMWindow> domwin(do_QueryReferent(mDOMWindowWeakref));
  if (domwin) { // dom window not deleted
    nsCOMPtr<nsIScrollable> scroller =
      do_QueryInterface(mDOMWindow->GetDocShell());

    if (scroller) {
      PRInt32 prefValue = aVisible ? NS_STYLE_OVERFLOW_AUTO :
                                     NS_STYLE_OVERFLOW_HIDDEN;
      scroller->GetDefaultScrollbarPreferences(
                  nsIScrollable::ScrollOrientation_Y, &prefValue);
      if (prefValue == NS_STYLE_OVERFLOW_HIDDEN) // try the other way
        scroller->GetDefaultScrollbarPreferences(
                    nsIScrollable::ScrollOrientation_X, &prefValue);

      if (prefValue == NS_STYLE_OVERFLOW_HIDDEN)
        *aVisible = PR_FALSE;
    }
  }

  return NS_OK;
}

NS_IMETHODIMP
ScrollbarsPropImpl::SetVisible(PRBool aVisible)
{
  /* Scrollbars, unlike the other barprops, implement visibility directly
     rather than handing off to the superclass (and from there to the
     chrome window) because scrollbar visibility uniquely applies only
     to the window making the change (arguably. it does now, anyway.)
     and because embedding apps have no interface for implementing this
     themselves, and therefore the implementation must be internal. */

  nsCOMPtr<nsIDOMWindow> domwin(do_QueryReferent(mDOMWindowWeakref));
  if (domwin) { // dom window must still exist. use away.
    nsCOMPtr<nsIScrollable> scroller =
      do_QueryInterface(mDOMWindow->GetDocShell());

    if (scroller) {
      PRInt32 prefValue = aVisible ? NS_STYLE_OVERFLOW_AUTO :
                                     NS_STYLE_OVERFLOW_HIDDEN;
      scroller->SetDefaultScrollbarPreferences(
                  nsIScrollable::ScrollOrientation_Y, prefValue);
      scroller->SetDefaultScrollbarPreferences(
                  nsIScrollable::ScrollOrientation_X, prefValue);
    }
  }

  /* Notably absent is the part where we notify the chrome window using
     mBrowserChrome->SetChromeFlags(). Given the possibility of multiple
     DOM windows (multiple top-level windows, even) within a single
     chrome window, the historical concept of a single "has scrollbars"
     flag in the chrome is inapplicable, and we can't tell at this level
     whether we represent the particular DOM window that makes this decision
     for the chrome.

     So only this object (and its corresponding DOM window) knows whether
     scrollbars are visible. The corresponding chrome window will need to
     ask (one of) its DOM window(s) when it needs to know about scrollbar
     visibility, rather than caching its own copy of that information.
  */

  return NS_OK;
}