Part 3 of Move SelectFileDialog implementation to ui/base/dialogs/

chrome/browser/ui/views/base_shell_dialog_win.cc

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "chrome/browser/ui/views/base_shell_dialog_win.h"
-
-#include <algorithm>
-
-#include "base/threading/thread.h"
-
-// Helpers to show certain types of Windows shell dialogs in a way that doesn't
-// block the UI of the entire app.
-
-class ShellDialogThread : public base::Thread {
- public:
-  ShellDialogThread() : base::Thread("Chrome_ShellDialogThread") { }
-  ~ShellDialogThread();
-
- protected:
-   void Init();
-
-   void CleanUp();
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(ShellDialogThread);
-};
-
-ShellDialogThread::~ShellDialogThread() {
-  Stop();
-}
-
-void ShellDialogThread::Init() {
-  // Initializes the COM library on the current thread.
-  CoInitialize(NULL);
-}
-
-void ShellDialogThread::CleanUp() {
-  // Closes the COM library on the current thread. CoInitialize must
-  // be balanced by a corresponding call to CoUninitialize.
-  CoUninitialize();
-}
-
-// static
-BaseShellDialogImpl::Owners BaseShellDialogImpl::owners_;
-int BaseShellDialogImpl::instance_count_ = 0;
-
-BaseShellDialogImpl::BaseShellDialogImpl() {
-  ++instance_count_;
-}
-
-BaseShellDialogImpl::~BaseShellDialogImpl() {
-  // All runs should be complete by the time this is called!
-  if (--instance_count_ == 0)
-    DCHECK(owners_.empty());
-}
-
-BaseShellDialogImpl::RunState BaseShellDialogImpl::BeginRun(HWND owner) {
-  // Cannot run a modal shell dialog if one is already running for this owner.
-  DCHECK(!IsRunningDialogForOwner(owner));
-  // The owner must be a top level window, otherwise we could end up with two
-  // entries in our map for the same top level window.
-  DCHECK(!owner || owner == GetAncestor(owner, GA_ROOT));
-  RunState run_state;
-  run_state.dialog_thread = CreateDialogThread();
-  run_state.owner = owner;
-  if (owner) {
-    owners_.insert(owner);
-    DisableOwner(owner);
-  }
-  return run_state;
-}
-
-void BaseShellDialogImpl::EndRun(RunState run_state) {
-  if (run_state.owner) {
-    DCHECK(IsRunningDialogForOwner(run_state.owner));
-    EnableOwner(run_state.owner);
-    DCHECK(owners_.find(run_state.owner) != owners_.end());
-    owners_.erase(run_state.owner);
-  }
-  DCHECK(run_state.dialog_thread);
-  delete run_state.dialog_thread;
-}
-
-bool BaseShellDialogImpl::IsRunningDialogForOwner(HWND owner) const {
-  return (owner && owners_.find(owner) != owners_.end());
-}
-
-void BaseShellDialogImpl::DisableOwner(HWND owner) {
-  if (IsWindow(owner))
-    EnableWindow(owner, FALSE);
-}
-
-// static
-base::Thread* BaseShellDialogImpl::CreateDialogThread() {
-  base::Thread* thread = new ShellDialogThread;
-  bool started = thread->Start();
-  DCHECK(started);
-  return thread;
-}
-
-void BaseShellDialogImpl::EnableOwner(HWND owner) {
-  if (IsWindow(owner))
-    EnableWindow(owner, TRUE);
-}