Add DesktopCapturer GetSourceList SelectSource FocusOnSelectedSource functions

webrtc/modules/desktop_capture/window_capturer.cc

+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/modules/desktop_capture/window_capturer.h"
+
+#include <string>
+#include <utility>
+
+namespace webrtc {
+
+WindowCapturer::~WindowCapturer() = default;
+
+bool WindowCapturer::GetWindowList(WindowList* windows) {
+  SourceList sources;
+  if (!GetSourceList(&sources)) {
+    return false;
+  }
+
+  for (const Source& source : sources) {
+    if (source.type == SourceType::WINDOW) {
+      windows->push_back({source.window_id(), std::move(source.title)});
+    }
+  }
+  return true;
+}
+
+bool WindowCapturer::SelectWindow(WindowId id) {
+  return SelectSource(Source::NewWindow(id, std::string()));
+}
+
+bool WindowCapturer::BringSelectedWindowToFront() {
+  return FocusOnSelectedSource();
+}
+
+bool WindowCapturer::GetSourceList(SourceList* sources) {
+  WindowList windows;
+  if (!GetWindowList(&windows)) {
+    return false;
+  }
+
+  for (const Window& window : windows) {
+    sources->push_back(Source::NewWindow(window.id, window.title));
+  }
+
+  return true;
+}
+
+bool WindowCapturer::SelectSource(const Source& source) {
+  if (source.type != SourceType::WINDOW) {
+    return false;
+  }
+
+  return SelectWindow(source.window_id());
+}
+
+bool WindowCapturer::FocusOnSelectedSource() {
+  return BringSelectedWindowToFront();
+}
+
+}  // namespace webrtc