selected_window_context.cc (2234B)
1 /* 2 * Copyright (c) 2019 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #include "modules/desktop_capture/win/selected_window_context.h" 12 13 #include "modules/desktop_capture/desktop_geometry.h" 14 #include "modules/desktop_capture/win/window_capture_utils.h" 15 16 namespace webrtc { 17 18 SelectedWindowContext::SelectedWindowContext( 19 HWND selected_window, 20 DesktopRect selected_window_rect, 21 WindowCaptureHelperWin* window_capture_helper) 22 : selected_window_(selected_window), 23 selected_window_rect_(selected_window_rect), 24 window_capture_helper_(window_capture_helper) { 25 selected_window_thread_id_ = 26 GetWindowThreadProcessId(selected_window, &selected_window_process_id_); 27 } 28 29 bool SelectedWindowContext::IsSelectedWindowValid() const { 30 return selected_window_thread_id_ != 0; 31 } 32 33 bool SelectedWindowContext::IsWindowOwnedBySelectedWindow(HWND hwnd) const { 34 // This check works for drop-down menus & dialog pop-up windows. 35 if (GetAncestor(hwnd, GA_ROOTOWNER) == selected_window_) { 36 return true; 37 } 38 39 // Assume that all other windows are unrelated to the selected window. 40 // This will cause some windows that are actually related to be missed, 41 // e.g. context menus and tool-tips, but avoids the risk of capturing 42 // unrelated windows. Using heuristics such as matching the thread and 43 // process Ids suffers from false-positives, e.g. in multi-document 44 // applications. 45 46 return false; 47 } 48 49 bool SelectedWindowContext::IsWindowOverlappingSelectedWindow(HWND hwnd) const { 50 return window_capture_helper_->AreWindowsOverlapping(hwnd, selected_window_, 51 selected_window_rect_); 52 } 53 54 HWND SelectedWindowContext::selected_window() const { 55 return selected_window_; 56 } 57 58 WindowCaptureHelperWin* SelectedWindowContext::window_capture_helper() const { 59 return window_capture_helper_; 60 } 61 62 } // namespace webrtc