sousa-gecko/widget/windows/nsPrintDialogWin.cpp

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsPrintDialogWin.h"

#include "WidgetUtils.h"
#include "WinUtils.h"
#include "mozilla/ScopeExit.h"
#include "mozilla/dom/Promise.h"
#include "nsArray.h"
#include "nsCOMPtr.h"
#include "nsComponentManagerUtils.h"
#include "nsIBaseWindow.h"
#include "nsIBrowserChild.h"
#include "nsIDialogParamBlock.h"
#include "nsIDocShell.h"
#include "nsIGlobalObject.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIPrintSettings.h"
#include "nsIWebBrowserChrome.h"
#include "nsIWidget.h"
#include "nsPIDOMWindow.h"
#include "nsPrintDialogUtil.h"
#include "nsQueryObject.h"
#include "nsServiceManagerUtils.h"
#include "nsThreadUtils.h"
#include "xpcpublic.h"

static const char* kPageSetupDialogURL =
    "chrome://global/content/printPageSetup.xhtml";

using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::widget;

/**
 * ParamBlock
 */

class ParamBlock {
 public:
  ParamBlock() { mBlock = nullptr; }
  ~ParamBlock() { NS_IF_RELEASE(mBlock); }
  nsresult Init() {
    return CallCreateInstance(NS_DIALOGPARAMBLOCK_CONTRACTID, &mBlock);
  }
  nsIDialogParamBlock* operator->() const MOZ_NO_ADDREF_RELEASE_ON_RETURN {
    return mBlock;
  }
  operator nsIDialogParamBlock* const() { return mBlock; }

 private:
  nsIDialogParamBlock* mBlock;
};

NS_IMPL_ISUPPORTS(nsPrintDialogServiceWin, nsIPrintDialogService)

NS_IMETHODIMP
nsPrintDialogServiceWin::Init() {
  nsresult rv;
  mWatcher = do_GetService(NS_WINDOWWATCHER_CONTRACTID, &rv);
  return rv;
}

NS_IMETHODIMP
nsPrintDialogServiceWin::ShowPrintDialog(mozIDOMWindowProxy* aParent,
                                         bool aHaveSelection,
                                         nsIPrintSettings* aSettings,
                                         JSContext* aCx, Promise** aPromise) {
  MOZ_ASSERT(NS_IsMainThread());
  NS_ENSURE_ARG(aParent);
  NS_ENSURE_ARG(aSettings);
  NS_ENSURE_ARG(aCx);
  NS_ENSURE_ARG(aPromise);

  ErrorResult rvErr;
  nsCOMPtr<nsIGlobalObject> global = xpc::CurrentNativeGlobal(aCx);
  RefPtr<Promise> promise = Promise::Create(global, rvErr);
  if (NS_WARN_IF(rvErr.Failed())) {
    return rvErr.StealNSResult();
  }

  RefPtr<nsIWidget> parentWidget =
      WidgetUtils::DOMWindowToWidget(nsPIDOMWindowOuter::From(aParent));

  ScopedRtlShimWindow shim(parentWidget.get());
  NS_ASSERTION(shim.get(), "Couldn't get native window for Print Dialog!");

  nsresult rv = NativeShowPrintDialog(shim.get(), aHaveSelection, aSettings);
  if (NS_SUCCEEDED(rv)) {
    promise->MaybeResolveWithUndefined();
  } else {
    promise->MaybeReject(rv);
  }
  promise.forget(aPromise);
  return NS_OK;
}

NS_IMETHODIMP
nsPrintDialogServiceWin::ShowPageSetupDialog(mozIDOMWindowProxy* aParent,
                                             nsIPrintSettings* aNSSettings,
                                             JSContext* aCx,
                                             Promise** aPromise) {
  MOZ_ASSERT(NS_IsMainThread());
  NS_ENSURE_ARG(aParent);
  NS_ENSURE_ARG(aNSSettings);
  NS_ENSURE_ARG(aCx);
  NS_ENSURE_ARG(aPromise);

  ErrorResult rvErr;
  nsCOMPtr<nsIGlobalObject> global = xpc::CurrentNativeGlobal(aCx);
  RefPtr<Promise> promise = Promise::Create(global, rvErr);
  if (NS_WARN_IF(rvErr.Failed())) {
    return rvErr.StealNSResult();
  }

  // Resolve or reject `promise` on every exit path based on `rv`, so the
  // body below can keep using the bare early-exit pattern.
  nsresult rv = NS_OK;
  auto resolveOnExit = MakeScopeExit([&rv, promise] {
    if (NS_SUCCEEDED(rv)) {
      promise->MaybeResolveWithUndefined();
    } else {
      promise->MaybeReject(rv);
    }
  });
  promise.forget(aPromise);

  ParamBlock block;
  rv = block.Init();
  if (NS_FAILED(rv)) {
    return NS_OK;
  }

  block->SetInt(0, 0);
  rv = DoDialog(aParent, block, aNSSettings, kPageSetupDialogURL);

  // if aWebBrowserPrint is not null then we are printing
  // so we want to pass back NS_ERROR_ABORT on cancel
  if (NS_SUCCEEDED(rv)) {
    int32_t status;
    block->GetInt(0, &status);
    rv = status == 0 ? NS_ERROR_ABORT : NS_OK;
  }

  // We don't call nsPrintSettingsService::MaybeSavePrintSettingsToPrefs here
  // since it's called for us in printPageSetup.js.  Maybe we should move that
  // call here for consistency with the other platforms though?

  return NS_OK;
}

nsresult nsPrintDialogServiceWin::DoDialog(mozIDOMWindowProxy* aParent,
                                           nsIDialogParamBlock* aParamBlock,
                                           nsIPrintSettings* aPS,
                                           const char* aChromeURL) {
  NS_ENSURE_ARG(aParamBlock);
  NS_ENSURE_ARG(aPS);
  NS_ENSURE_ARG(aChromeURL);

  if (!mWatcher) return NS_ERROR_FAILURE;

  // get a parent, if at all possible
  // (though we'd rather this didn't fail, it's OK if it does. so there's
  // no failure or null check.)
  // retain ownership for method lifetime
  nsCOMPtr<mozIDOMWindowProxy> activeParent;
  if (!aParent) {
    mWatcher->GetActiveWindow(getter_AddRefs(activeParent));
    aParent = activeParent;
  }

  // create a nsIMutableArray of the parameters
  // being passed to the window
  nsCOMPtr<nsIMutableArray> array = nsArray::Create();

  nsCOMPtr<nsISupports> psSupports(do_QueryInterface(aPS));
  NS_ASSERTION(psSupports, "PrintSettings must be a supports");
  array->AppendElement(psSupports);

  nsCOMPtr<nsISupports> blkSupps(do_QueryInterface(aParamBlock));
  NS_ASSERTION(blkSupps, "IOBlk must be a supports");
  array->AppendElement(blkSupps);

  nsCOMPtr<mozIDOMWindowProxy> dialog;
  nsresult rv = mWatcher->OpenWindow(
      aParent, nsDependentCString(aChromeURL), u"_blank"_ns,
      "centerscreen,chrome,modal,titlebar"_ns, array, getter_AddRefs(dialog));

  return rv;
}