1 files changed, 196 insertions, 0 deletions
diff --git a/widget/windows/filedialog/WinFileDialogCommands.cpp b/widget/windows/filedialog/WinFileDialogCommands.cpp
new file mode 100644
index 0000000000..756e6b1cf3
--- /dev/null
+++ b/widget/windows/filedialog/WinFileDialogCommands.cpp
@@ -0,0 +1,196 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 "mozilla/widget/filedialog/WinFileDialogCommands.h"
+
+#include <shobjidl.h>
+#include <shtypes.h>
+#include <winerror.h>
+#include "WinUtils.h"
+
+namespace mozilla::widget::filedialog {
+
+// Visitor to apply commands to the dialog.
+struct Applicator {
+  IFileDialog* dialog = nullptr;
+
+  HRESULT Visit(Command const& c) {
+    switch (c.type()) {
+      default:
+      case Command::T__None:
+        return E_INVALIDARG;
+
+      case Command::TSetOptions:
+        return Apply(c.get_SetOptions());
+      case Command::TSetTitle:
+        return Apply(c.get_SetTitle());
+      case Command::TSetOkButtonLabel:
+        return Apply(c.get_SetOkButtonLabel());
+      case Command::TSetFolder:
+        return Apply(c.get_SetFolder());
+      case Command::TSetFileName:
+        return Apply(c.get_SetFileName());
+      case Command::TSetDefaultExtension:
+        return Apply(c.get_SetDefaultExtension());
+      case Command::TSetFileTypes:
+        return Apply(c.get_SetFileTypes());
+      case Command::TSetFileTypeIndex:
+        return Apply(c.get_SetFileTypeIndex());
+    }
+  }
+
+  HRESULT Apply(SetOptions const& c) { return dialog->SetOptions(c.options()); }
+  HRESULT Apply(SetTitle const& c) { return dialog->SetTitle(c.title().get()); }
+  HRESULT Apply(SetOkButtonLabel const& c) {
+    return dialog->SetOkButtonLabel(c.label().get());
+  }
+  HRESULT Apply(SetFolder const& c) {
+    RefPtr<IShellItem> folder;
+    if (SUCCEEDED(SHCreateItemFromParsingName(
+            c.path().get(), nullptr, IID_IShellItem, getter_AddRefs(folder)))) {
+      return dialog->SetFolder(folder);
+    }
+    // graciously accept that the provided path may have been nonsense
+    return S_OK;
+  }
+  HRESULT Apply(SetFileName const& c) {
+    return dialog->SetFileName(c.filename().get());
+  }
+  HRESULT Apply(SetDefaultExtension const& c) {
+    return dialog->SetDefaultExtension(c.extension().get());
+  }
+  HRESULT Apply(SetFileTypes const& c) {
+    std::vector<COMDLG_FILTERSPEC> vec;
+    for (auto const& filter : c.filterList()) {
+      vec.push_back(
+          {.pszName = filter.name().get(), .pszSpec = filter.spec().get()});
+    }
+    return dialog->SetFileTypes(vec.size(), vec.data());
+  }
+  HRESULT Apply(SetFileTypeIndex const& c) {
+    return dialog->SetFileTypeIndex(c.index());
+  }
+};
+
+namespace {
+static HRESULT GetShellItemPath(IShellItem* aItem, nsString& aResultString) {
+  NS_ENSURE_TRUE(aItem, E_INVALIDARG);
+
+  LPWSTR str = nullptr;
+  auto const onExit = MakeScopeExit([&]() { CoTaskMemFree(str); });
+
+  HRESULT const hr = aItem->GetDisplayName(SIGDN_FILESYSPATH, &str);
+  if (SUCCEEDED(hr)) {
+    aResultString.Assign(str);
+  }
+  return hr;
+}
+}  // namespace
+
+#define MOZ_ENSURE_HRESULT_OK(call_)          \
+  do {                                        \
+    HRESULT const hr = (call_);               \
+    if (FAILED(hr)) return Err(nsresult(hr)); \
+  } while (0)
+
+nsresult ApplyCommands(::IFileDialog* dialog,
+                       nsTArray<Command> const& commands) {
+  Applicator applicator{.dialog = dialog};
+  for (auto const& cmd : commands) {
+    MOZ_ENSURE_HRESULT_OK(applicator.Visit(cmd));
+  }
+  return NS_OK;
+}
+
+mozilla::Result<Results, nsresult> GetFileResults(::IFileDialog* dialog) {
+  FILEOPENDIALOGOPTIONS fos;
+  MOZ_ENSURE_HRESULT_OK(dialog->GetOptions(&fos));
+
+  using widget::WinUtils;
+
+  // Extract which filter type the user selected
+  UINT index;
+  MOZ_ENSURE_HRESULT_OK(dialog->GetFileTypeIndex(&index));
+
+  // single selection
+  if ((fos & FOS_ALLOWMULTISELECT) == 0) {
+    RefPtr<IShellItem> item;
+    MOZ_ENSURE_HRESULT_OK(dialog->GetResult(getter_AddRefs(item)));
+    if (!item) {
+      return Err(nsresult::NS_ERROR_FAILURE);
+    }
+
+    nsAutoString path;
+    MOZ_ENSURE_HRESULT_OK(GetShellItemPath(item, path));
+
+    return Results({path}, index);
+  }
+
+  // multiple selection
+  RefPtr<IFileOpenDialog> openDlg;
+  dialog->QueryInterface(IID_IFileOpenDialog, getter_AddRefs(openDlg));
+  if (!openDlg) {
+    MOZ_ASSERT(false, "a file-save dialog was given FOS_ALLOWMULTISELECT?");
+    return Err(NS_ERROR_UNEXPECTED);
+  }
+
+  RefPtr<IShellItemArray> items;
+  MOZ_ENSURE_HRESULT_OK(openDlg->GetResults(getter_AddRefs(items)));
+  if (!items) {
+    return Err(NS_ERROR_FAILURE);
+  }
+
+  nsTArray<nsString> paths;
+
+  DWORD count = 0;
+  MOZ_ENSURE_HRESULT_OK(items->GetCount(&count));
+  for (DWORD idx = 0; idx < count; idx++) {
+    RefPtr<IShellItem> item;
+    MOZ_ENSURE_HRESULT_OK(items->GetItemAt(idx, getter_AddRefs(item)));
+
+    nsAutoString str;
+    MOZ_ENSURE_HRESULT_OK(GetShellItemPath(item, str));
+
+    paths.EmplaceBack(str);
+  }
+
+  return Results(std::move(paths), std::move(index));
+}
+
+mozilla::Result<nsString, nsresult> GetFolderResults(::IFileDialog* dialog) {
+  RefPtr<IShellItem> item;
+  MOZ_ENSURE_HRESULT_OK(dialog->GetResult(getter_AddRefs(item)));
+  if (!item) {
+    // shouldn't happen -- probably a precondition failure on our part, but
+    // might be due to misbehaving shell extensions?
+    MOZ_ASSERT(false,
+               "unexpected lack of item: was `Show`'s return value checked?");
+    return Err(NS_ERROR_FAILURE);
+  }
+
+  // If the user chose a Win7 Library, resolve to the library's
+  // default save folder.
+  RefPtr<IShellLibrary> shellLib;
+  RefPtr<IShellItem> folderPath;
+  MOZ_ENSURE_HRESULT_OK(
+      CoCreateInstance(CLSID_ShellLibrary, nullptr, CLSCTX_INPROC_SERVER,
+                       IID_IShellLibrary, getter_AddRefs(shellLib)));
+
+  if (shellLib && SUCCEEDED(shellLib->LoadLibraryFromItem(item, STGM_READ)) &&
+      SUCCEEDED(shellLib->GetDefaultSaveFolder(DSFT_DETECT, IID_IShellItem,
+                                               getter_AddRefs(folderPath)))) {
+    item.swap(folderPath);
+  }
+
+  // get the folder's file system path
+  nsAutoString str;
+  MOZ_ENSURE_HRESULT_OK(GetShellItemPath(item, str));
+  return str;
+}
+
+#undef MOZ_ENSURE_HRESULT_OK
+
+}  // namespace mozilla::widget::filedialog