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// Copyright 2015 The Chromium Embedded Framework 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 "cef/libcef/browser/native/browser_platform_delegate_native_win.h"
#include <shellapi.h>
#include <wininet.h>
#include <winspool.h>
#include "base/base_paths_win.h"
#include "base/files/file_util.h"
#include "base/path_service.h"
#include "base/strings/utf_string_conversions.h"
#include "base/win/win_util.h"
#include "cef/libcef/browser/alloy/alloy_browser_host_impl.h"
#include "cef/libcef/browser/context.h"
#include "cef/libcef/browser/geometry_util.h"
#include "cef/libcef/browser/native/window_delegate_view.h"
#include "cef/libcef/browser/thread_util.h"
#include "components/input/native_web_keyboard_event.h"
#include "third_party/blink/public/common/input/web_mouse_event.h"
#include "third_party/blink/public/common/input/web_mouse_wheel_event.h"
#include "ui/aura/window.h"
#include "ui/base/win/shell.h"
#include "ui/display/display.h"
#include "ui/display/screen.h"
#include "ui/display/win/screen_win.h"
#include "ui/events/keycodes/dom/dom_key.h"
#include "ui/events/keycodes/dom/keycode_converter.h"
#include "ui/events/keycodes/keyboard_code_conversion_win.h"
#include "ui/events/keycodes/platform_key_map_win.h"
#include "ui/gfx/geometry/vector2d.h"
#include "ui/gfx/win/hwnd_util.h"
#include "ui/views/widget/desktop_aura/desktop_window_tree_host_win.h"
#include "ui/views/widget/widget.h"
#include "ui/views/win/hwnd_util.h"
#pragma comment(lib, "dwmapi.lib")
namespace {
void WriteTempFileAndView(const std::string& data) {
CEF_REQUIRE_BLOCKING();
base::FilePath tmp_file;
if (!base::CreateTemporaryFile(&tmp_file)) {
return;
}
// The shell command will look at the file extension to identify the correct
// program to open.
tmp_file = tmp_file.AddExtension(L"txt");
const bool write_success = base::WriteFile(tmp_file, data);
DCHECK(write_success);
ui::win::OpenFileViaShell(tmp_file);
}
gfx::Rect GetDisplayWorkAreaNearestPoint(gfx::Point dip_point) {
const auto display =
display::Screen::GetScreen()->GetDisplayNearestPoint(dip_point);
// Work area in DIP.
return display.work_area();
}
CefRect GetScreenFrameRectFromDIPContentRect(HWND window,
gfx::Rect dip_rect,
DWORD style,
DWORD ex_style,
bool has_menu) {
// Convert from DIP using a method that can handle multiple displays with
// different DPI. If |window| is nullptr the closest display will be used.
const auto screen_rect =
display::win::ScreenWin::DIPToScreenRect(window, dip_rect);
RECT rect = {screen_rect.x(), screen_rect.y(),
screen_rect.x() + screen_rect.width(),
screen_rect.y() + screen_rect.height()};
AdjustWindowRectEx(&rect, style, has_menu, ex_style);
// Keep the original origin while potentially increasing the size to include
// the frame non-client area.
return CefRect(screen_rect.x(), screen_rect.y(), rect.right - rect.left,
rect.bottom - rect.top);
}
CefRect GetAdjustedScreenFrameRect(CefRect screen_rect,
DWORD style,
DWORD ex_style,
bool has_menu) {
// If height or width is not provided let the OS determine the position and
// size similar to Chromium behavior. Note that |CW_USEDEFAULT| cannot be
// stored in a gfx::Rect due to clamping.
if (screen_rect.width == CW_USEDEFAULT ||
screen_rect.height == CW_USEDEFAULT) {
return CefRect(CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT);
}
if (screen_rect.x == CW_USEDEFAULT) {
screen_rect.x = 0;
}
if (screen_rect.y == CW_USEDEFAULT) {
screen_rect.y = 0;
}
// Convert to DIP using a method that can handle multiple displays with
// different DPI.
const auto dip_rect = display::win::ScreenWin::ScreenToDIPRect(
nullptr, gfx::Rect(screen_rect.x, screen_rect.y, screen_rect.width,
screen_rect.height));
const auto visible_dip_rect = MakeVisibleOnScreenRect(
dip_rect, GetDisplayWorkAreaNearestPoint(dip_rect.origin()));
return GetScreenFrameRectFromDIPContentRect(
/*window=*/nullptr, visible_dip_rect, style, ex_style, has_menu);
}
} // namespace
CefBrowserPlatformDelegateNativeWin::CefBrowserPlatformDelegateNativeWin(
const CefWindowInfo& window_info,
SkColor background_color)
: CefBrowserPlatformDelegateNativeAura(window_info, background_color) {}
void CefBrowserPlatformDelegateNativeWin::set_widget(
views::Widget* widget,
CefWindowHandle widget_handle) {
DCHECK(!window_widget_);
window_widget_ = widget;
DCHECK(!window_info_.window);
window_info_.window = widget_handle;
}
void CefBrowserPlatformDelegateNativeWin::BrowserDestroyed(
CefBrowserHostBase* browser) {
CefBrowserPlatformDelegateNativeAura::BrowserDestroyed(browser);
if (host_window_created_) {
// Release the reference added in CreateHostWindow().
browser->Release();
}
}
bool CefBrowserPlatformDelegateNativeWin::CreateHostWindow() {
RegisterWindowClass();
if (window_info_.style == 0) {
// Client didn't intialize the CefWindowInfo. Provide reasonable defaults.
window_info_.SetAsPopup(nullptr, CefString());
}
has_frame_ = !(window_info_.style & WS_CHILD);
const std::wstring windowName(CefString(&window_info_.window_name));
CefRect window_rect = window_info_.bounds;
if (!window_info_.parent_window) {
const bool has_menu =
!(window_info_.style & WS_CHILD) && (window_info_.menu != nullptr);
window_rect = GetAdjustedScreenFrameRect(window_rect, window_info_.style,
window_info_.ex_style, has_menu);
}
// Create the new browser window.
CreateWindowEx(window_info_.ex_style, GetWndClass(), windowName.c_str(),
window_info_.style, window_rect.x, window_rect.y,
window_rect.width, window_rect.height,
window_info_.parent_window, window_info_.menu,
::GetModuleHandle(nullptr), this);
// It's possible for CreateWindowEx to fail if the parent window was
// destroyed between the call to CreateBrowser and the above one.
DCHECK(window_info_.window);
if (!window_info_.window) {
return false;
}
host_window_created_ = true;
// Add a reference that will later be released in DestroyBrowser().
browser_->AddRef();
if (!called_enable_non_client_dpi_scaling_ && has_frame_) {
// This call gets Windows to scale the non-client area when WM_DPICHANGED
// is fired on Windows versions < 10.0.14393.0.
// Derived signature; not available in headers.
using EnableChildWindowDpiMessagePtr = LRESULT(WINAPI*)(HWND, BOOL);
static const auto enable_child_window_dpi_message_func =
reinterpret_cast<EnableChildWindowDpiMessagePtr>(
base::win::GetUser32FunctionPointer("EnableChildWindowDpiMessage"));
if (enable_child_window_dpi_message_func) {
enable_child_window_dpi_message_func(window_info_.window, TRUE);
}
}
DCHECK(!window_widget_);
RECT cr;
GetClientRect(window_info_.window, &cr);
// Convert to DIP using a method that can handle multiple displays with
// different DPI. Client coordinates always have origin (0,0).
const gfx::Rect dip_rect = display::win::ScreenWin::ScreenToDIPRect(
window_info_.window, gfx::Rect(0, 0, cr.right, cr.bottom));
// Stay on top if top-most window hosting the web view is topmost.
HWND top_level_window = GetAncestor(window_info_.window, GA_ROOT);
DWORD top_level_window_ex_styles =
GetWindowLongPtr(top_level_window, GWL_EXSTYLE);
bool always_on_top =
(top_level_window_ex_styles & WS_EX_TOPMOST) == WS_EX_TOPMOST;
CefWindowDelegateView* delegate_view = new CefWindowDelegateView(
GetBackgroundColor(), always_on_top, GetBoundsChangedCallback(),
GetWidgetDeleteCallback());
delegate_view->Init(window_info_.window, web_contents_,
gfx::Rect(0, 0, dip_rect.width(), dip_rect.height()));
window_widget_ = delegate_view->GetWidget();
const HWND widget_hwnd = HWNDForWidget(window_widget_);
DCHECK(widget_hwnd);
const DWORD widget_ex_styles = GetWindowLongPtr(widget_hwnd, GWL_EXSTYLE);
if (window_info_.ex_style & WS_EX_NOACTIVATE) {
// Add the WS_EX_NOACTIVATE style on the DesktopWindowTreeHostWin HWND
// so that HWNDMessageHandler::Show() called via Widget::Show() does not
// activate the window.
SetWindowLongPtr(widget_hwnd, GWL_EXSTYLE,
widget_ex_styles | WS_EX_NOACTIVATE);
}
window_widget_->Show();
if (window_info_.ex_style & WS_EX_NOACTIVATE) {
// Remove the WS_EX_NOACTIVATE style so that future mouse clicks inside the
// browser correctly activate and focus the window.
SetWindowLongPtr(widget_hwnd, GWL_EXSTYLE, widget_ex_styles);
}
return true;
}
void CefBrowserPlatformDelegateNativeWin::CloseHostWindow() {
if (window_info_.window != nullptr) {
HWND frameWnd = GetAncestor(window_info_.window, GA_ROOT);
PostMessage(frameWnd, WM_CLOSE, 0, 0);
}
}
CefWindowHandle CefBrowserPlatformDelegateNativeWin::GetHostWindowHandle()
const {
if (windowless_handler_) {
return windowless_handler_->GetParentWindowHandle();
}
return window_info_.window;
}
views::Widget* CefBrowserPlatformDelegateNativeWin::GetWindowWidget() const {
return window_widget_;
}
void CefBrowserPlatformDelegateNativeWin::SetFocus(bool setFocus) {
if (!setFocus) {
return;
}
if (window_widget_) {
// Give native focus to the DesktopWindowTreeHostWin ("Chrome_WidgetWin_0")
// associated with the root window. The currently focused HWND may be
// "CefBrowserWindow" if we're called in response to our WndProc receiving
// the WM_SETFOCUS event (possibly due to "CefBrowserWindow" recieving the
// top-level WM_ACTIVATE event), or some other HWND if the client calls
// CefBrowserHost::SetFocus(true) directly. DesktopWindowTreeHostWin may
// also receive focus/blur and mouse click events from the OS directly, in
// which case this method will not be called but the below discussion still
// applies.
//
// The DesktopWindowTreeHostWin::HandleNativeFocus/HandleNativeBlur methods
// are called in response to WM_SETFOCUS/WM_KILLFOCUS respectively. The
// DesktopWindowTreeHostWin::HandleMouseEvent method is called if the user
// clicks on the WebContents. These methods have all been patched to call
// HandleActivationChanged (indirectly via ::SetFocus in the case of mouse
// clicks). HandleActivationChanged will then trigger the following
// behaviors:
// 1. Update focus/activation state of the aura::Window indirectly via
// wm::FocusController. This allows focus-related behaviors (e.g. focus
// rings, flashing caret, onFocus/onBlur JS events, etc.) to work as
// expected (see issue #1677) and also triggers an initial call to
// WebContents::Focus which gives logical focus to the
// RenderWidgetHostViewAura in the views hierarchy (see issue #3306).
// 2. Update focus state of the ui::InputMethod. If this does not occur
// then:
// (a) InputMethodBase::GetTextInputClient will return NULL and
// InputMethodWin::OnChar will fail to send character events to the
// renderer (see issue #1700); and
// (b) InputMethodWinBase::IsWindowFocused will return false due to
// ::GetFocus() returning the currently focused HWND (e.g.
// "CefBrowserWindow") instead of the expected "Chrome_WidgetWin_0" HWND,
// causing TSF not to handle IME events (see issue #3306). For this same
// reason, ::SetFocus needs to be called before WebContents::Focus which
// sends the InputMethod OnWillChangeFocusedClient notification that then
// calls IsWindowFocused (e.g. WebContents::Focus is intentionally called
// multiple times).
//
// This differs from activation in Chrome which is handled via
// HWNDMessageHandler::PostProcessActivateMessage (Widget::Show indirectly
// calls HWNDMessageHandler::Activate which calls ::SetForegroundWindow
// resulting in a WM_ACTIVATE message being sent to the window). The Chrome
// code path doesn't work for CEF because IsTopLevelWindow in
// hwnd_message_handler.cc will return false and consequently
// HWNDMessageHandler::PostProcessActivateMessage will not be called.
//
// Activation events are usually reserved for the top-level window so
// triggering activation based on focus events may be incorrect in some
// circumstances. Revisit this implementation if additional problems are
// discovered.
::SetFocus(HWNDForWidget(window_widget_));
}
if (web_contents_) {
// Give logical focus to the RenderWidgetHostViewAura in the views
// hierarchy. This does not change the native keyboard focus. When
// |window_widget_| exists this additional Focus() call is necessary to
// correctly assign focus/input state after native focus resulting from
// window activation (see the InputMethod discussion above).
web_contents_->Focus();
}
}
void CefBrowserPlatformDelegateNativeWin::NotifyMoveOrResizeStarted() {
// Call the parent method to dismiss any existing popups.
CefBrowserPlatformDelegateNativeAura::NotifyMoveOrResizeStarted();
if (!window_widget_) {
return;
}
// Notify DesktopWindowTreeHostWin of move events so that screen rectangle
// information is communicated to the renderer process and popups are
// displayed in the correct location.
views::DesktopWindowTreeHostWin* tree_host =
static_cast<views::DesktopWindowTreeHostWin*>(
aura::WindowTreeHost::GetForAcceleratedWidget(
HWNDForWidget(window_widget_)));
DCHECK(tree_host);
if (tree_host) {
// Cast to HWNDMessageHandlerDelegate so we can access HandleMove().
static_cast<views::HWNDMessageHandlerDelegate*>(tree_host)->HandleMove();
}
}
void CefBrowserPlatformDelegateNativeWin::SizeTo(int width, int height) {
HWND window = window_info_.window;
const DWORD style = GetWindowLong(window, GWL_STYLE);
const DWORD ex_style = GetWindowLong(window, GWL_EXSTYLE);
const bool has_menu = !(style & WS_CHILD) && (GetMenu(window) != nullptr);
const auto frame_rect = GetScreenFrameRectFromDIPContentRect(
window, gfx::Rect(0, 0, width, height), style, ex_style, has_menu);
// Size the window. The left/top values may be negative.
SetWindowPos(window, nullptr, 0, 0, frame_rect.width, frame_rect.height,
SWP_NOZORDER | SWP_NOMOVE | SWP_NOACTIVATE);
}
void CefBrowserPlatformDelegateNativeWin::ViewText(const std::string& text) {
CEF_POST_USER_VISIBLE_TASK(base::BindOnce(WriteTempFileAndView, text));
}
bool CefBrowserPlatformDelegateNativeWin::HandleKeyboardEvent(
const input::NativeWebKeyboardEvent& event) {
// Any unhandled keyboard/character messages are sent to DefWindowProc so that
// shortcut keys work correctly.
if (event.os_event) {
const auto& msg = event.os_event->native_event();
return !DefWindowProc(msg.hwnd, msg.message, msg.wParam, msg.lParam);
} else {
MSG msg = {};
msg.hwnd = GetHostWindowHandle();
if (!msg.hwnd) {
return false;
}
switch (event.GetType()) {
case blink::WebInputEvent::Type::kRawKeyDown:
msg.message = event.is_system_key ? WM_SYSKEYDOWN : WM_KEYDOWN;
break;
case blink::WebInputEvent::Type::kKeyUp:
msg.message = event.is_system_key ? WM_SYSKEYUP : WM_KEYUP;
break;
case blink::WebInputEvent::Type::kChar:
msg.message = event.is_system_key ? WM_SYSCHAR : WM_CHAR;
break;
default:
DCHECK(false);
return false;
}
msg.wParam = event.windows_key_code;
UINT scan_code = ::MapVirtualKeyW(event.windows_key_code, MAPVK_VK_TO_VSC);
msg.lParam = (scan_code << 16) | // key scan code
1; // key repeat count
if (event.GetModifiers() & input::NativeWebKeyboardEvent::kAltKey) {
msg.lParam |= (1 << 29);
}
return !DefWindowProc(msg.hwnd, msg.message, msg.wParam, msg.lParam);
}
}
CefEventHandle CefBrowserPlatformDelegateNativeWin::GetEventHandle(
const input::NativeWebKeyboardEvent& event) const {
if (!event.os_event) {
return nullptr;
}
return ChromeToWindowsType(
const_cast<CHROME_MSG*>(&event.os_event->native_event()));
}
ui::KeyEvent CefBrowserPlatformDelegateNativeWin::TranslateUiKeyEvent(
const CefKeyEvent& key_event) const {
int flags = TranslateUiEventModifiers(key_event.modifiers);
ui::KeyboardCode key_code =
ui::KeyboardCodeForWindowsKeyCode(key_event.windows_key_code);
ui::DomCode dom_code =
ui::KeycodeConverter::NativeKeycodeToDomCode(key_event.native_key_code);
base::TimeTicks time_stamp = GetEventTimeStamp();
if (key_event.type == KEYEVENT_CHAR) {
return ui::KeyEvent::FromCharacter(/*character=*/key_event.windows_key_code,
key_code, dom_code, flags, time_stamp);
}
ui::EventType type = ui::EventType::kUnknown;
switch (key_event.type) {
case KEYEVENT_RAWKEYDOWN:
case KEYEVENT_KEYDOWN:
type = ui::EventType::kKeyPressed;
break;
case KEYEVENT_KEYUP:
type = ui::EventType::kKeyReleased;
break;
default:
DCHECK(false);
}
ui::DomKey dom_key =
ui::PlatformKeyMap::DomKeyFromKeyboardCode(key_code, &flags);
return ui::KeyEvent(type, key_code, dom_code, flags, dom_key, time_stamp);
}
gfx::Vector2d CefBrowserPlatformDelegateNativeWin::GetUiWheelEventOffset(
int deltaX,
int deltaY) const {
static const ULONG defaultScrollCharsPerWheelDelta = 1;
static const FLOAT scrollbarPixelsPerLine = 100.0f / 3.0f;
static const ULONG defaultScrollLinesPerWheelDelta = 3;
float wheelDeltaX = float(deltaX) / WHEEL_DELTA;
float wheelDeltaY = float(deltaY) / WHEEL_DELTA;
float scrollDeltaX = wheelDeltaX;
float scrollDeltaY = wheelDeltaY;
ULONG scrollChars = defaultScrollCharsPerWheelDelta;
SystemParametersInfo(SPI_GETWHEELSCROLLCHARS, 0, &scrollChars, 0);
scrollDeltaX *= static_cast<FLOAT>(scrollChars) * scrollbarPixelsPerLine;
ULONG scrollLines = defaultScrollLinesPerWheelDelta;
SystemParametersInfo(SPI_GETWHEELSCROLLLINES, 0, &scrollLines, 0);
scrollDeltaY *= static_cast<FLOAT>(scrollLines) * scrollbarPixelsPerLine;
return gfx::Vector2d(scrollDeltaX, scrollDeltaY);
}
// static
void CefBrowserPlatformDelegateNativeWin::RegisterWindowClass() {
static bool registered = false;
if (registered) {
return;
}
// Register the window class
WNDCLASSEX wcex = {
/* cbSize = */ sizeof(WNDCLASSEX),
/* style = */ CS_HREDRAW | CS_VREDRAW,
/* lpfnWndProc = */ CefBrowserPlatformDelegateNativeWin::WndProc,
/* cbClsExtra = */ 0,
/* cbWndExtra = */ 0,
/* hInstance = */ ::GetModuleHandle(nullptr),
/* hIcon = */ nullptr,
/* hCursor = */ LoadCursor(nullptr, IDC_ARROW),
/* hbrBackground = */ nullptr,
/* lpszMenuName = */ nullptr,
/* lpszClassName = */ CefBrowserPlatformDelegateNativeWin::GetWndClass(),
/* hIconSm = */ nullptr,
};
RegisterClassEx(&wcex);
registered = true;
}
// static
LPCTSTR CefBrowserPlatformDelegateNativeWin::GetWndClass() {
return L"CefBrowserWindow";
}
// static
LRESULT CALLBACK CefBrowserPlatformDelegateNativeWin::WndProc(HWND hwnd,
UINT message,
WPARAM wParam,
LPARAM lParam) {
CefBrowserPlatformDelegateNativeWin* platform_delegate = nullptr;
CefBrowserHostBase* browser = nullptr;
if (message != WM_NCCREATE) {
platform_delegate = static_cast<CefBrowserPlatformDelegateNativeWin*>(
gfx::GetWindowUserData(hwnd));
if (platform_delegate) {
browser = platform_delegate->browser_;
}
}
switch (message) {
case WM_CLOSE:
if (browser && !browser->TryCloseBrowser()) {
// Cancel the close.
return 0;
}
// Allow the close.
break;
case WM_NCCREATE: {
CREATESTRUCT* cs = reinterpret_cast<CREATESTRUCT*>(lParam);
platform_delegate =
reinterpret_cast<CefBrowserPlatformDelegateNativeWin*>(
cs->lpCreateParams);
DCHECK(platform_delegate);
// Associate |platform_delegate| with the window handle.
gfx::SetWindowUserData(hwnd, platform_delegate);
platform_delegate->window_info_.window = hwnd;
if (platform_delegate->has_frame_) {
// This call gets Windows to scale the non-client area when
// WM_DPICHANGED is fired on Windows versions >= 10.0.14393.0.
using EnableNonClientDpiScalingPtr =
decltype(::EnableNonClientDpiScaling)*;
static const auto enable_non_client_dpi_scaling_func =
reinterpret_cast<EnableNonClientDpiScalingPtr>(
base::win::GetUser32FunctionPointer(
"EnableNonClientDpiScaling"));
platform_delegate->called_enable_non_client_dpi_scaling_ =
!!(enable_non_client_dpi_scaling_func &&
enable_non_client_dpi_scaling_func(hwnd));
}
} break;
case WM_NCDESTROY:
if (platform_delegate) {
// Clear the user data pointer.
gfx::SetWindowUserData(hwnd, nullptr);
// Force the browser to be destroyed. This will result in a call to
// BrowserDestroyed() that will release the reference added in
// CreateHostWindow().
AlloyBrowserHostImpl::FromBaseChecked(browser)->WindowDestroyed();
}
break;
case WM_SIZE:
if (platform_delegate && platform_delegate->window_widget_) {
// Pass window resize events to the HWND for the DesktopNativeWidgetAura
// root window. Passing size 0x0 (wParam == SIZE_MINIMIZED, for example)
// will cause the widget to be hidden which reduces resource usage.
RECT rc;
GetClientRect(hwnd, &rc);
SetWindowPos(HWNDForWidget(platform_delegate->window_widget_), nullptr,
rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top,
SWP_NOZORDER);
}
return 0;
case WM_MOVING:
case WM_MOVE:
if (browser) {
browser->NotifyMoveOrResizeStarted();
}
return 0;
case WM_SETFOCUS:
// Selecting "Close window" from the task bar menu may send a focus
// notification even though the window is currently disabled (e.g. while
// a modal JS dialog is displayed).
if (browser && ::IsWindowEnabled(hwnd)) {
browser->SetFocus(true);
}
return 0;
case WM_ERASEBKGND:
return 0;
case WM_DPICHANGED:
if (platform_delegate && platform_delegate->has_frame_) {
// Suggested size and position of the current window scaled for the
// new DPI.
const RECT* rect = reinterpret_cast<RECT*>(lParam);
SetWindowPos(platform_delegate->GetHostWindowHandle(), nullptr,
rect->left, rect->top, rect->right - rect->left,
rect->bottom - rect->top, SWP_NOZORDER | SWP_NOACTIVATE);
}
break;
case WM_ENABLE:
if (wParam == TRUE && browser) {
// Give focus to the browser after EnableWindow enables this window
// (e.g. after a modal dialog is dismissed).
browser->SetFocus(true);
return 0;
}
break;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
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