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electron/shell/browser/native_window_views_win.cc

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// Copyright (c) 2015 GitHub, Inc.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.
#include <dwmapi.h>
#include <shellapi.h>
#include <wrl/client.h>
#include "base/win/atl.h" // Must be before UIAutomationCore.h
#include "base/win/scoped_handle.h"
#include "content/public/browser/browser_accessibility_state.h"
#include "shell/browser/browser.h"
#include "shell/browser/native_window_views.h"
#include "shell/browser/ui/views/root_view.h"
#include "shell/browser/ui/views/win_frame_view.h"
#include "shell/common/electron_constants.h"
#include "ui/display/display.h"
#include "ui/display/win/screen_win.h"
#include "ui/gfx/geometry/insets.h"
#include "ui/gfx/geometry/resize_utils.h"
#include "ui/views/widget/native_widget_private.h"
// Must be included after other Windows headers.
#include <UIAutomationClient.h>
#include <UIAutomationCoreApi.h>
namespace electron {
namespace {
// Convert Win32 WM_APPCOMMANDS to strings.
const char* AppCommandToString(int command_id) {
switch (command_id) {
case APPCOMMAND_BROWSER_BACKWARD:
return kBrowserBackward;
case APPCOMMAND_BROWSER_FORWARD:
return kBrowserForward;
case APPCOMMAND_BROWSER_REFRESH:
return "browser-refresh";
case APPCOMMAND_BROWSER_STOP:
return "browser-stop";
case APPCOMMAND_BROWSER_SEARCH:
return "browser-search";
case APPCOMMAND_BROWSER_FAVORITES:
return "browser-favorites";
case APPCOMMAND_BROWSER_HOME:
return "browser-home";
case APPCOMMAND_VOLUME_MUTE:
return "volume-mute";
case APPCOMMAND_VOLUME_DOWN:
return "volume-down";
case APPCOMMAND_VOLUME_UP:
return "volume-up";
case APPCOMMAND_MEDIA_NEXTTRACK:
return "media-nexttrack";
case APPCOMMAND_MEDIA_PREVIOUSTRACK:
return "media-previoustrack";
case APPCOMMAND_MEDIA_STOP:
return "media-stop";
case APPCOMMAND_MEDIA_PLAY_PAUSE:
return "media-play-pause";
case APPCOMMAND_LAUNCH_MAIL:
return "launch-mail";
case APPCOMMAND_LAUNCH_MEDIA_SELECT:
return "launch-media-select";
case APPCOMMAND_LAUNCH_APP1:
return "launch-app1";
case APPCOMMAND_LAUNCH_APP2:
return "launch-app2";
case APPCOMMAND_BASS_DOWN:
return "bass-down";
case APPCOMMAND_BASS_BOOST:
return "bass-boost";
case APPCOMMAND_BASS_UP:
return "bass-up";
case APPCOMMAND_TREBLE_DOWN:
return "treble-down";
case APPCOMMAND_TREBLE_UP:
return "treble-up";
case APPCOMMAND_MICROPHONE_VOLUME_MUTE:
return "microphone-volume-mute";
case APPCOMMAND_MICROPHONE_VOLUME_DOWN:
return "microphone-volume-down";
case APPCOMMAND_MICROPHONE_VOLUME_UP:
return "microphone-volume-up";
case APPCOMMAND_HELP:
return "help";
case APPCOMMAND_FIND:
return "find";
case APPCOMMAND_NEW:
return "new";
case APPCOMMAND_OPEN:
return "open";
case APPCOMMAND_CLOSE:
return "close";
case APPCOMMAND_SAVE:
return "save";
case APPCOMMAND_PRINT:
return "print";
case APPCOMMAND_UNDO:
return "undo";
case APPCOMMAND_REDO:
return "redo";
case APPCOMMAND_COPY:
return "copy";
case APPCOMMAND_CUT:
return "cut";
case APPCOMMAND_PASTE:
return "paste";
case APPCOMMAND_REPLY_TO_MAIL:
return "reply-to-mail";
case APPCOMMAND_FORWARD_MAIL:
return "forward-mail";
case APPCOMMAND_SEND_MAIL:
return "send-mail";
case APPCOMMAND_SPELL_CHECK:
return "spell-check";
case APPCOMMAND_MIC_ON_OFF_TOGGLE:
return "mic-on-off-toggle";
case APPCOMMAND_CORRECTION_LIST:
return "correction-list";
case APPCOMMAND_MEDIA_PLAY:
return "media-play";
case APPCOMMAND_MEDIA_PAUSE:
return "media-pause";
case APPCOMMAND_MEDIA_RECORD:
return "media-record";
case APPCOMMAND_MEDIA_FAST_FORWARD:
return "media-fast-forward";
case APPCOMMAND_MEDIA_REWIND:
return "media-rewind";
case APPCOMMAND_MEDIA_CHANNEL_UP:
return "media-channel-up";
case APPCOMMAND_MEDIA_CHANNEL_DOWN:
return "media-channel-down";
case APPCOMMAND_DELETE:
return "delete";
case APPCOMMAND_DICTATE_OR_COMMAND_CONTROL_TOGGLE:
return "dictate-or-command-control-toggle";
default:
return "unknown";
}
}
// Copied from ui/views/win/hwnd_message_handler.cc
gfx::ResizeEdge GetWindowResizeEdge(WPARAM param) {
switch (param) {
case WMSZ_BOTTOM:
return gfx::ResizeEdge::kBottom;
case WMSZ_TOP:
return gfx::ResizeEdge::kTop;
case WMSZ_LEFT:
return gfx::ResizeEdge::kLeft;
case WMSZ_RIGHT:
return gfx::ResizeEdge::kRight;
case WMSZ_TOPLEFT:
return gfx::ResizeEdge::kTopLeft;
case WMSZ_TOPRIGHT:
return gfx::ResizeEdge::kTopRight;
case WMSZ_BOTTOMLEFT:
return gfx::ResizeEdge::kBottomLeft;
case WMSZ_BOTTOMRIGHT:
return gfx::ResizeEdge::kBottomRight;
default:
return gfx::ResizeEdge::kBottomRight;
}
}
bool IsMutexPresent(const wchar_t* name) {
base::win::ScopedHandle mutex_holder(::CreateMutex(nullptr, false, name));
return ::GetLastError() == ERROR_ALREADY_EXISTS;
}
bool IsLibraryLoaded(const wchar_t* name) {
HMODULE hmodule = nullptr;
::GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT, name,
&hmodule);
return hmodule != nullptr;
}
// The official way to get screen reader status is to call:
// SystemParametersInfo(SPI_GETSCREENREADER) && UiaClientsAreListening()
// However it has false positives (for example when user is using touch screens)
// and will cause performance issues in some apps.
bool IsScreenReaderActive() {
if (IsMutexPresent(L"NarratorRunning"))
return true;
static const wchar_t* names[] = {// NVDA
L"nvdaHelperRemote.dll",
// JAWS
L"jhook.dll",
// Window-Eyes
L"gwhk64.dll", L"gwmhook.dll",
// ZoomText
L"AiSquared.Infuser.HookLib.dll"};
for (auto* name : names) {
if (IsLibraryLoaded(name))
return true;
}
return false;
}
} // namespace
std::set<NativeWindowViews*> NativeWindowViews::forwarding_windows_;
HHOOK NativeWindowViews::mouse_hook_ = nullptr;
void NativeWindowViews::Maximize() {
// Only use Maximize() when window is NOT transparent style
if (!transparent()) {
if (IsVisible()) {
widget()->Maximize();
} else {
widget()->native_widget_private()->Show(ui::SHOW_STATE_MAXIMIZED,
gfx::Rect());
NotifyWindowShow();
}
} else {
restore_bounds_ = GetBounds();
auto display = display::Screen::GetScreen()->GetDisplayNearestWindow(
GetNativeWindow());
SetBounds(display.work_area(), false);
NotifyWindowMaximize();
}
}
bool NativeWindowViews::ExecuteWindowsCommand(int command_id) {
std::string command = AppCommandToString(command_id);
NotifyWindowExecuteAppCommand(command);
return false;
}
bool NativeWindowViews::PreHandleMSG(UINT message,
WPARAM w_param,
LPARAM l_param,
LRESULT* result) {
NotifyWindowMessage(message, w_param, l_param);
// Avoid side effects when calling SetWindowPlacement.
if (is_setting_window_placement_) {
// Let Chromium handle the WM_NCCALCSIZE message otherwise the window size
// would be wrong.
// See https://github.com/electron/electron/issues/22393 for more.
if (message == WM_NCCALCSIZE)
return false;
// Otherwise handle the message with default proc,
*result = DefWindowProc(GetAcceleratedWidget(), message, w_param, l_param);
// and tell Chromium to ignore this message.
return true;
}
if (message == taskbar_created_message_) {
// We need to reset all of our buttons because the taskbar went away.
taskbar_host_.RestoreThumbarButtons(GetAcceleratedWidget());
return true;
}
switch (message) {
// Screen readers send WM_GETOBJECT in order to get the accessibility
// object, so take this opportunity to push Chromium into accessible
// mode if it isn't already, always say we didn't handle the message
// because we still want Chromium to handle returning the actual
// accessibility object.
case WM_GETOBJECT: {
if (checked_for_a11y_support_)
return false;
const DWORD obj_id = static_cast<DWORD>(l_param);
if (obj_id != static_cast<DWORD>(OBJID_CLIENT)) {
return false;
}
if (!IsScreenReaderActive()) {
return false;
}
checked_for_a11y_support_ = true;
auto* const axState = content::BrowserAccessibilityState::GetInstance();
if (axState && !axState->IsAccessibleBrowser()) {
axState->OnScreenReaderDetected();
Browser::Get()->OnAccessibilitySupportChanged();
}
return false;
}
case WM_GETMINMAXINFO: {
WINDOWPLACEMENT wp;
wp.length = sizeof(WINDOWPLACEMENT);
// We do this to work around a Windows bug, where the minimized Window
// would report that the closest display to it is not the one that it was
// previously on (but the leftmost one instead). We restore the position
// of the window during the restore operation, this way chromium can
// use the proper display to calculate the scale factor to use.
if (!last_normal_placement_bounds_.IsEmpty() &&
(IsVisible() || IsMinimized()) &&
GetWindowPlacement(GetAcceleratedWidget(), &wp)) {
wp.rcNormalPosition = last_normal_placement_bounds_.ToRECT();
// When calling SetWindowPlacement, Chromium would do window messages
// handling. But since we are already in PreHandleMSG this would cause
// crash in Chromium under some cases.
//
// We work around the crash by prevent Chromium from handling window
// messages until the SetWindowPlacement call is done.
//
// See https://github.com/electron/electron/issues/21614 for more.
is_setting_window_placement_ = true;
SetWindowPlacement(GetAcceleratedWidget(), &wp);
is_setting_window_placement_ = false;
last_normal_placement_bounds_ = gfx::Rect();
}
return false;
}
case WM_COMMAND:
// Handle thumbar button click message.
if (HIWORD(w_param) == THBN_CLICKED)
return taskbar_host_.HandleThumbarButtonEvent(LOWORD(w_param));
return false;
case WM_SIZING: {
is_resizing_ = true;
bool prevent_default = false;
gfx::Rect bounds = gfx::Rect(*reinterpret_cast<RECT*>(l_param));
HWND hwnd = GetAcceleratedWidget();
gfx::Rect dpi_bounds = ScreenToDIPRect(hwnd, bounds);
NotifyWindowWillResize(dpi_bounds, GetWindowResizeEdge(w_param),
&prevent_default);
if (prevent_default) {
::GetWindowRect(hwnd, reinterpret_cast<RECT*>(l_param));
pending_bounds_change_.reset();
return true; // Tells Windows that the Sizing is handled.
}
return false;
}
case WM_SIZE: {
// Handle window state change.
HandleSizeEvent(w_param, l_param);
return false;
}
case WM_EXITSIZEMOVE: {
if (is_resizing_) {
NotifyWindowResized();
is_resizing_ = false;
}
if (is_moving_) {
NotifyWindowMoved();
is_moving_ = false;
}
// If the user dragged or moved the window during one or more
// calls to window.setBounds(), we want to apply the most recent
// one once they are done with the move or resize operation.
if (pending_bounds_change_.has_value()) {
SetBounds(pending_bounds_change_.value(), false /* animate */);
pending_bounds_change_.reset();
}
return false;
}
case WM_MOVING: {
is_moving_ = true;
bool prevent_default = false;
gfx::Rect bounds = gfx::Rect(*reinterpret_cast<RECT*>(l_param));
HWND hwnd = GetAcceleratedWidget();
gfx::Rect dpi_bounds = ScreenToDIPRect(hwnd, bounds);
NotifyWindowWillMove(dpi_bounds, &prevent_default);
if (!movable_ || prevent_default) {
::GetWindowRect(hwnd, reinterpret_cast<RECT*>(l_param));
pending_bounds_change_.reset();
return true; // Tells Windows that the Move is handled. If not true,
// frameless windows can be moved using
// -webkit-app-region: drag elements.
}
return false;
}
case WM_ENDSESSION: {
if (w_param) {
NotifyWindowEndSession();
}
return false;
}
case WM_PARENTNOTIFY: {
if (LOWORD(w_param) == WM_CREATE) {
// Because of reasons regarding legacy drivers and stuff, a window that
// matches the client area is created and used internally by Chromium.
// This is used when forwarding mouse messages. We only cache the first
// occurrence (the webview window) because dev tools also cause this
// message to be sent.
if (!legacy_window_) {
legacy_window_ = reinterpret_cast<HWND>(l_param);
}
}
return false;
}
case WM_CONTEXTMENU: {
bool prevent_default = false;
NotifyWindowSystemContextMenu(GET_X_LPARAM(l_param),
GET_Y_LPARAM(l_param), &prevent_default);
return prevent_default;
}
case WM_SYSCOMMAND: {
// Mask is needed to account for double clicking title bar to maximize
WPARAM max_mask = 0xFFF0;
if (transparent() && ((w_param & max_mask) == SC_MAXIMIZE)) {
return true;
}
return false;
}
case WM_INITMENU: {
// This is handling the scenario where the menu might get triggered by the
// user doing "alt + space" resulting in system maximization and restore
// being used on transparent windows when that does not work.
if (transparent()) {
HMENU menu = GetSystemMenu(GetAcceleratedWidget(), false);
EnableMenuItem(menu, SC_MAXIMIZE,
MF_BYCOMMAND | MF_DISABLED | MF_GRAYED);
EnableMenuItem(menu, SC_RESTORE,
MF_BYCOMMAND | MF_DISABLED | MF_GRAYED);
return true;
}
return false;
}
default: {
return false;
}
}
}
void NativeWindowViews::HandleSizeEvent(WPARAM w_param, LPARAM l_param) {
// Here we handle the WM_SIZE event in order to figure out what is the current
// window state and notify the user accordingly.
switch (w_param) {
case SIZE_MAXIMIZED:
case SIZE_MINIMIZED: {
WINDOWPLACEMENT wp;
wp.length = sizeof(WINDOWPLACEMENT);
if (GetWindowPlacement(GetAcceleratedWidget(), &wp)) {
last_normal_placement_bounds_ = gfx::Rect(wp.rcNormalPosition);
}
// Note that SIZE_MAXIMIZED and SIZE_MINIMIZED might be emitted for
// multiple times for one resize because of the SetWindowPlacement call.
if (w_param == SIZE_MAXIMIZED &&
last_window_state_ != ui::SHOW_STATE_MAXIMIZED) {
if (last_window_state_ == ui::SHOW_STATE_MINIMIZED)
NotifyWindowRestore();
last_window_state_ = ui::SHOW_STATE_MAXIMIZED;
NotifyWindowMaximize();
ResetWindowControls();
} else if (w_param == SIZE_MINIMIZED &&
last_window_state_ != ui::SHOW_STATE_MINIMIZED) {
last_window_state_ = ui::SHOW_STATE_MINIMIZED;
NotifyWindowMinimize();
}
break;
}
case SIZE_RESTORED: {
switch (last_window_state_) {
case ui::SHOW_STATE_MAXIMIZED:
last_window_state_ = ui::SHOW_STATE_NORMAL;
NotifyWindowUnmaximize();
break;
case ui::SHOW_STATE_MINIMIZED:
if (IsFullscreen()) {
last_window_state_ = ui::SHOW_STATE_FULLSCREEN;
NotifyWindowEnterFullScreen();
} else {
last_window_state_ = ui::SHOW_STATE_NORMAL;
NotifyWindowRestore();
}
break;
default:
break;
}
ResetWindowControls();
break;
}
}
}
void NativeWindowViews::ResetWindowControls() {
// If a given window was minimized and has since been
// unminimized (restored/maximized), ensure the WCO buttons
// are reset to their default unpressed state.
auto* ncv = widget()->non_client_view();
if (IsWindowControlsOverlayEnabled() && ncv) {
auto* frame_view = static_cast<WinFrameView*>(ncv->frame_view());
frame_view->caption_button_container()->ResetWindowControls();
}
}
void NativeWindowViews::SetForwardMouseMessages(bool forward) {
if (forward && !forwarding_mouse_messages_) {
forwarding_mouse_messages_ = true;
forwarding_windows_.insert(this);
// Subclassing is used to fix some issues when forwarding mouse messages;
// see comments in |SubclassProc|.
SetWindowSubclass(legacy_window_, SubclassProc, 1,
reinterpret_cast<DWORD_PTR>(this));
if (!mouse_hook_) {
mouse_hook_ = SetWindowsHookEx(WH_MOUSE_LL, MouseHookProc, nullptr, 0);
}
} else if (!forward && forwarding_mouse_messages_) {
forwarding_mouse_messages_ = false;
forwarding_windows_.erase(this);
RemoveWindowSubclass(legacy_window_, SubclassProc, 1);
if (forwarding_windows_.empty()) {
UnhookWindowsHookEx(mouse_hook_);
mouse_hook_ = nullptr;
}
}
}
LRESULT CALLBACK NativeWindowViews::SubclassProc(HWND hwnd,
UINT msg,
WPARAM w_param,
LPARAM l_param,
UINT_PTR subclass_id,
DWORD_PTR ref_data) {
auto* window = reinterpret_cast<NativeWindowViews*>(ref_data);
switch (msg) {
case WM_MOUSELEAVE: {
// When input is forwarded to underlying windows, this message is posted.
// If not handled, it interferes with Chromium logic, causing for example
// mouseleave events to fire. If those events are used to exit forward
// mode, excessive flickering on for example hover items in underlying
// windows can occur due to rapidly entering and leaving forwarding mode.
// By consuming and ignoring the message, we're essentially telling
// Chromium that we have not left the window despite somebody else getting
// the messages. As to why this is caught for the legacy window and not
// the actual browser window is simply that the legacy window somehow
// makes use of these events; posting to the main window didn't work.
if (window->forwarding_mouse_messages_) {
return 0;
}
break;
}
}
return DefSubclassProc(hwnd, msg, w_param, l_param);
}
LRESULT CALLBACK NativeWindowViews::MouseHookProc(int n_code,
WPARAM w_param,
LPARAM l_param) {
if (n_code < 0) {
return CallNextHookEx(nullptr, n_code, w_param, l_param);
}
// Post a WM_MOUSEMOVE message for those windows whose client area contains
// the cursor since they are in a state where they would otherwise ignore all
// mouse input.
if (w_param == WM_MOUSEMOVE) {
for (auto* window : forwarding_windows_) {
// At first I considered enumerating windows to check whether the cursor
// was directly above the window, but since nothing bad seems to happen
// if we post the message even if some other window occludes it I have
// just left it as is.
RECT client_rect;
GetClientRect(window->legacy_window_, &client_rect);
POINT p = reinterpret_cast<MSLLHOOKSTRUCT*>(l_param)->pt;
ScreenToClient(window->legacy_window_, &p);
if (PtInRect(&client_rect, p)) {
WPARAM w = 0; // No virtual keys pressed for our purposes
LPARAM l = MAKELPARAM(p.x, p.y);
PostMessage(window->legacy_window_, WM_MOUSEMOVE, w, l);
}
}
}
return CallNextHookEx(nullptr, n_code, w_param, l_param);
}
} // namespace electron
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