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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 "libcef/browser/native/browser_platform_delegate_native_win.h"
#include <shellapi.h>
#include <wininet.h>
#include <winspool.h>
#include "libcef/browser/browser_host_impl.h"
#include "libcef/browser/context.h"
#include "libcef/browser/native/file_dialog_runner_win.h"
#include "libcef/browser/native/javascript_dialog_runner_win.h"
#include "libcef/browser/native/menu_runner_win.h"
#include "libcef/browser/native/window_delegate_view.h"
#include "libcef/browser/thread_util.h"
#include "base/files/file_util.h"
#include "base/memory/ref_counted_memory.h"
#include "base/strings/utf_string_conversions.h"
#include "base/win/registry.h"
#include "base/win/win_util.h"
#include "content/public/browser/native_web_keyboard_event.h"
#include "third_party/blink/public/platform/web_mouse_event.h"
#include "third_party/blink/public/platform/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/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/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(scoped_refptr<base::RefCountedString> str) {
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 std::string& data = str->data();
int write_ct = base::WriteFile(tmp_file, data.c_str(), data.size());
DCHECK_EQ(static_cast<int>(data.size()), write_ct);
ui::win::OpenFileViaShell(tmp_file);
}
// According to Mozilla in uriloader/exthandler/win/nsOSHelperAppService.cpp:
// "Some versions of windows (Win2k before SP3, Win XP before SP1) crash in
// ShellExecute on long URLs (bug 161357 on bugzilla.mozilla.org). IE 5 and 6
// support URLS of 2083 chars in length, 2K is safe."
const int kMaxAddressLengthChars = 2048;
bool HasExternalHandler(const std::string& scheme) {
base::win::RegKey key;
const std::wstring registry_path =
base::ASCIIToUTF16(scheme + "\\shell\\open\\command");
key.Open(HKEY_CLASSES_ROOT, registry_path.c_str(), KEY_READ);
if (key.Valid()) {
DWORD size = 0;
key.ReadValue(NULL, NULL, &size, NULL);
if (size > 2) {
// ShellExecute crashes the process when the command is empty.
// We check for "2" because it always returns the trailing NULL.
return true;
}
}
return false;
}
void ExecuteExternalProtocol(const GURL& url) {
CEF_REQUIRE_BLOCKING();
if (!HasExternalHandler(url.scheme()))
return;
const std::string& address = url.spec();
if (address.length() > kMaxAddressLengthChars)
return;
ShellExecuteA(NULL, "open", address.c_str(), NULL, NULL, SW_SHOWNORMAL);
}
// DPI value for 1x scale factor.
#define DPI_1X 96.0f
float GetWindowScaleFactor(HWND hwnd) {
DCHECK(hwnd);
if (base::win::IsProcessPerMonitorDpiAware()) {
// Let Windows tell us the correct DPI.
static auto get_dpi_for_window_func = []() {
return reinterpret_cast<decltype(::GetDpiForWindow)*>(
GetProcAddress(GetModuleHandle(L"user32.dll"), "GetDpiForWindow"));
}();
if (get_dpi_for_window_func)
return static_cast<float>(get_dpi_for_window_func(hwnd)) / DPI_1X;
}
// Fallback to the monitor that contains the window center point.
RECT cr;
GetWindowRect(hwnd, &cr);
return display::Screen::GetScreen()
->GetDisplayNearestPoint(
gfx::Point((cr.right - cr.left) / 2, (cr.bottom - cr.top) / 2))
.device_scale_factor();
}
} // namespace
CefBrowserPlatformDelegateNativeWin::CefBrowserPlatformDelegateNativeWin(
const CefWindowInfo& window_info,
SkColor background_color,
bool use_shared_texture,
bool use_external_begin_frame)
: CefBrowserPlatformDelegateNative(window_info,
background_color,
use_shared_texture,
use_external_begin_frame),
host_window_created_(false),
window_widget_(nullptr) {}
void CefBrowserPlatformDelegateNativeWin::BrowserDestroyed(
CefBrowserHostImpl* browser) {
CefBrowserPlatformDelegate::BrowserDestroyed(browser);
if (host_window_created_) {
// Release the reference added in CreateHostWindow().
browser->Release();
}
}
bool CefBrowserPlatformDelegateNativeWin::CreateHostWindow() {
RegisterWindowClass();
has_frame_ = !(window_info_.style & WS_CHILD);
std::wstring windowName(CefString(&window_info_.window_name));
// Create the new browser window.
CreateWindowEx(window_info_.ex_style, GetWndClass(), windowName.c_str(),
window_info_.style, window_info_.x, window_info_.y,
window_info_.width, window_info_.height,
window_info_.parent_window, window_info_.menu,
::GetModuleHandle(NULL), 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_ &&
base::win::IsProcessPerMonitorDpiAware()) {
// 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.
static auto enable_child_window_dpi_message_func = []() {
using EnableChildWindowDpiMessagePtr = LRESULT(WINAPI*)(HWND, BOOL);
return reinterpret_cast<EnableChildWindowDpiMessagePtr>(GetProcAddress(
GetModuleHandle(L"user32.dll"), "EnableChildWindowDpiMessage"));
}();
if (enable_child_window_dpi_message_func)
enable_child_window_dpi_message_func(window_info_.window, TRUE);
}
DCHECK(!window_widget_);
// Convert from device coordinates to logical coordinates.
RECT cr;
GetClientRect(window_info_.window, &cr);
gfx::Point point = gfx::Point(cr.right, cr.bottom);
const float scale = GetWindowScaleFactor(window_info_.window);
point =
gfx::ToFlooredPoint(gfx::ScalePoint(gfx::PointF(point), 1.0f / scale));
// 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());
delegate_view->Init(window_info_.window, browser_->web_contents(),
gfx::Rect(0, 0, point.x(), point.y()));
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 != NULL) {
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::SendFocusEvent(bool setFocus) {
if (!setFocus)
return;
if (browser_->web_contents()) {
// Give logical focus to the RenderWidgetHostViewAura in the views
// hierarchy. This does not change the native keyboard focus.
browser_->web_contents()->Focus();
}
if (window_widget_) {
// Give native focus to the DesktopWindowTreeHostWin associated with the
// root window.
//
// The DesktopWindowTreeHostWin HandleNativeFocus/HandleNativeBlur methods
// are called in response to WM_SETFOCUS/WM_KILLFOCUS respectively. The
// implementation has been patched to call HandleActivationChanged which
// results in 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).
// 2. Update focus state of the ui::InputMethod. If this does not occur
// then InputMethodBase::GetTextInputClient will return NULL and
// InputMethodWin::OnChar will fail to sent character events to the
// renderer (see issue #1700).
//
// 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_));
}
}
void CefBrowserPlatformDelegateNativeWin::NotifyMoveOrResizeStarted() {
// Call the parent method to dismiss any existing popups.
CefBrowserPlatformDelegate::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;
RECT rect = {0, 0, width, height};
DWORD style = GetWindowLong(window, GWL_STYLE);
DWORD ex_style = GetWindowLong(window, GWL_EXSTYLE);
bool has_menu = !(style & WS_CHILD) && (GetMenu(window) != NULL);
// The size value is for the client area. Calculate the whole window size
// based on the current style.
AdjustWindowRectEx(&rect, style, has_menu, ex_style);
// Size the window. The left/top values may be negative.
SetWindowPos(window, NULL, 0, 0, rect.right - rect.left,
rect.bottom - rect.top,
SWP_NOZORDER | SWP_NOMOVE | SWP_NOACTIVATE);
}
gfx::Point CefBrowserPlatformDelegateNativeWin::GetScreenPoint(
const gfx::Point& view) const {
if (windowless_handler_)
return windowless_handler_->GetParentScreenPoint(view);
if (!window_info_.window)
return view;
// Convert from logical coordinates to device coordinates.
const float scale = GetWindowScaleFactor(window_info_.window);
const gfx::Point& device_pt =
gfx::ToFlooredPoint(gfx::ScalePoint(gfx::PointF(view), scale));
// Convert from client coordinates to screen coordinates.
POINT screen_pt = {device_pt.x(), device_pt.y()};
ClientToScreen(window_info_.window, &screen_pt);
return gfx::Point(screen_pt.x, screen_pt.y);
}
void CefBrowserPlatformDelegateNativeWin::ViewText(const std::string& text) {
std::string str = text;
scoped_refptr<base::RefCountedString> str_ref =
base::RefCountedString::TakeString(&str);
CEF_POST_USER_VISIBLE_TASK(base::Bind(WriteTempFileAndView, str_ref));
}
bool CefBrowserPlatformDelegateNativeWin::HandleKeyboardEvent(
const content::NativeWebKeyboardEvent& event) {
// Any unhandled keyboard/character messages are sent to DefWindowProc so that
// shortcut keys work correctly.
if (event.os_event) {
const MSG& 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::kRawKeyDown:
msg.message = event.is_system_key ? WM_SYSKEYDOWN : WM_KEYDOWN;
break;
case blink::WebInputEvent::kKeyUp:
msg.message = event.is_system_key ? WM_SYSKEYUP : WM_KEYUP;
break;
case blink::WebInputEvent::kChar:
msg.message = event.is_system_key ? WM_SYSCHAR : WM_CHAR;
break;
default:
NOTREACHED();
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() & content::NativeWebKeyboardEvent::kAltKey)
msg.lParam |= (1 << 29);
return !DefWindowProc(msg.hwnd, msg.message, msg.wParam, msg.lParam);
}
}
// static
void CefBrowserPlatformDelegate::HandleExternalProtocol(const GURL& url) {
CEF_POST_USER_VISIBLE_TASK(base::Bind(ExecuteExternalProtocol, url));
}
void CefBrowserPlatformDelegateNativeWin::TranslateKeyEvent(
content::NativeWebKeyboardEvent& result,
const CefKeyEvent& key_event) const {
result.windows_key_code = key_event.windows_key_code;
result.native_key_code = key_event.native_key_code;
result.is_system_key = key_event.is_system_key ? 1 : 0;
switch (key_event.type) {
case KEYEVENT_RAWKEYDOWN:
case KEYEVENT_KEYDOWN:
result.SetType(blink::WebInputEvent::kRawKeyDown);
break;
case KEYEVENT_KEYUP:
result.SetType(blink::WebInputEvent::kKeyUp);
break;
case KEYEVENT_CHAR:
result.SetType(blink::WebInputEvent::kChar);
break;
default:
NOTREACHED();
}
// Populate DOM values that will be passed to JavaScript handlers via
// KeyboardEvent.
result.dom_code = static_cast<int>(
ui::KeycodeConverter::NativeKeycodeToDomCode(key_event.native_key_code));
if (result.GetType() == blink::WebInputEvent::kChar) {
result.dom_key = ui::DomKey::FromCharacter(key_event.windows_key_code);
} else {
// TODO(cef): CefKeyEvent does not currently pass extended key status (see
// WM_KEYDOWN docs) which would be necessary to pass EF_IS_EXTENDED_KEY as
// the |flags| parameter to DomKeyFromKeyboardCode().
int flags = 0;
result.dom_key = ui::PlatformKeyMap::DomKeyFromKeyboardCode(
ui::KeyboardCodeForWindowsKeyCode(key_event.windows_key_code), &flags);
}
if (result.GetType() == blink::WebInputEvent::kChar ||
result.GetType() == blink::WebInputEvent::kRawKeyDown) {
result.text[0] = result.windows_key_code;
result.unmodified_text[0] = result.windows_key_code;
}
result.SetModifiers(result.GetModifiers() |
TranslateModifiers(key_event.modifiers));
}
void CefBrowserPlatformDelegateNativeWin::TranslateClickEvent(
blink::WebMouseEvent& result,
const CefMouseEvent& mouse_event,
CefBrowserHost::MouseButtonType type,
bool mouseUp,
int clickCount) const {
TranslateMouseEvent(result, mouse_event);
switch (type) {
case MBT_LEFT:
result.SetType(mouseUp ? blink::WebInputEvent::kMouseUp
: blink::WebInputEvent::kMouseDown);
result.button = blink::WebMouseEvent::Button::kLeft;
break;
case MBT_MIDDLE:
result.SetType(mouseUp ? blink::WebInputEvent::kMouseUp
: blink::WebInputEvent::kMouseDown);
result.button = blink::WebMouseEvent::Button::kMiddle;
break;
case MBT_RIGHT:
result.SetType(mouseUp ? blink::WebInputEvent::kMouseUp
: blink::WebInputEvent::kMouseDown);
result.button = blink::WebMouseEvent::Button::kRight;
break;
default:
NOTREACHED();
}
result.click_count = clickCount;
}
void CefBrowserPlatformDelegateNativeWin::TranslateMoveEvent(
blink::WebMouseEvent& result,
const CefMouseEvent& mouse_event,
bool mouseLeave) const {
TranslateMouseEvent(result, mouse_event);
if (!mouseLeave) {
result.SetType(blink::WebInputEvent::kMouseMove);
if (mouse_event.modifiers & EVENTFLAG_LEFT_MOUSE_BUTTON)
result.button = blink::WebMouseEvent::Button::kLeft;
else if (mouse_event.modifiers & EVENTFLAG_MIDDLE_MOUSE_BUTTON)
result.button = blink::WebMouseEvent::Button::kMiddle;
else if (mouse_event.modifiers & EVENTFLAG_RIGHT_MOUSE_BUTTON)
result.button = blink::WebMouseEvent::Button::kRight;
else
result.button = blink::WebMouseEvent::Button::kNoButton;
} else {
result.SetType(blink::WebInputEvent::kMouseLeave);
result.button = blink::WebMouseEvent::Button::kNoButton;
}
result.click_count = 0;
}
void CefBrowserPlatformDelegateNativeWin::TranslateWheelEvent(
blink::WebMouseWheelEvent& result,
const CefMouseEvent& mouse_event,
int deltaX,
int deltaY) const {
TranslateMouseEvent(result, mouse_event);
result.SetType(blink::WebInputEvent::kMouseWheel);
result.button = blink::WebMouseEvent::Button::kNoButton;
float wheelDelta;
bool horizontalScroll = false;
wheelDelta = static_cast<float>(deltaY ? deltaY : deltaX);
horizontalScroll = (deltaY == 0);
static const ULONG defaultScrollCharsPerWheelDelta = 1;
static const FLOAT scrollbarPixelsPerLine = 100.0f / 3.0f;
static const ULONG defaultScrollLinesPerWheelDelta = 3;
wheelDelta /= WHEEL_DELTA;
float scrollDelta = wheelDelta;
if (horizontalScroll) {
ULONG scrollChars = defaultScrollCharsPerWheelDelta;
SystemParametersInfo(SPI_GETWHEELSCROLLCHARS, 0, &scrollChars, 0);
scrollDelta *= static_cast<FLOAT>(scrollChars) * scrollbarPixelsPerLine;
} else {
ULONG scrollLines = defaultScrollLinesPerWheelDelta;
SystemParametersInfo(SPI_GETWHEELSCROLLLINES, 0, &scrollLines, 0);
if (scrollLines == WHEEL_PAGESCROLL)
result.scroll_by_page = true;
if (!result.scroll_by_page)
scrollDelta *= static_cast<FLOAT>(scrollLines) * scrollbarPixelsPerLine;
}
// Set scroll amount based on above calculations. WebKit expects positive
// deltaY to mean "scroll up" and positive deltaX to mean "scroll left".
if (horizontalScroll) {
result.delta_x = scrollDelta;
result.wheel_ticks_x = wheelDelta;
} else {
result.delta_y = scrollDelta;
result.wheel_ticks_y = wheelDelta;
}
}
CefEventHandle CefBrowserPlatformDelegateNativeWin::GetEventHandle(
const content::NativeWebKeyboardEvent& event) const {
if (!event.os_event)
return NULL;
return const_cast<CefEventHandle>(&event.os_event->native_event());
}
std::unique_ptr<CefFileDialogRunner>
CefBrowserPlatformDelegateNativeWin::CreateFileDialogRunner() {
return base::WrapUnique(new CefFileDialogRunnerWin);
}
std::unique_ptr<CefJavaScriptDialogRunner>
CefBrowserPlatformDelegateNativeWin::CreateJavaScriptDialogRunner() {
return base::WrapUnique(new CefJavaScriptDialogRunnerWin);
}
std::unique_ptr<CefMenuRunner>
CefBrowserPlatformDelegateNativeWin::CreateMenuRunner() {
return base::WrapUnique(new CefMenuRunnerWin);
}
void CefBrowserPlatformDelegateNativeWin::TranslateMouseEvent(
blink::WebMouseEvent& result,
const CefMouseEvent& mouse_event) const {
// position
result.SetPositionInWidget(mouse_event.x, mouse_event.y);
const gfx::Point& screen_pt =
GetScreenPoint(gfx::Point(mouse_event.x, mouse_event.y));
result.SetPositionInScreen(screen_pt.x(), screen_pt.y());
// modifiers
result.SetModifiers(result.GetModifiers() |
TranslateModifiers(mouse_event.modifiers));
// timestamp
result.SetTimeStamp(base::TimeTicks() +
base::TimeDelta::FromMilliseconds(GetMessageTime()));
result.pointer_type = blink::WebPointerProperties::PointerType::kMouse;
}
gfx::Point CefBrowserPlatformDelegateNativeWin::GetDialogPosition(
const gfx::Size& size) {
const gfx::Size& max_size = GetMaximumDialogSize();
return gfx::Point((max_size.width() - size.width()) / 2,
(max_size.height() - size.height()) / 2);
}
gfx::Size CefBrowserPlatformDelegateNativeWin::GetMaximumDialogSize() {
return GetWindowWidget()->GetWindowBoundsInScreen().size();
}
// 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(NULL),
/* hIcon = */ NULL,
/* hCursor = */ LoadCursor(NULL, IDC_ARROW),
/* hbrBackground = */ 0,
/* lpszMenuName = */ NULL,
/* lpszClassName = */ CefBrowserPlatformDelegateNativeWin::GetWndClass(),
/* hIconSm = */ NULL,
};
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;
CefBrowserHostImpl* 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_ &&
base::win::IsProcessPerMonitorDpiAware()) {
// This call gets Windows to scale the non-client area when
// WM_DPICHANGED is fired on Windows versions >= 10.0.14393.0.
static auto enable_non_client_dpi_scaling_func = []() {
return reinterpret_cast<decltype(::EnableNonClientDpiScaling)*>(
GetProcAddress(GetModuleHandle(L"user32.dll"),
"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, NULL);
// Force the browser to be destroyed. This will result in a call to
// BrowserDestroyed() that will release the reference added in
// CreateHostWindow().
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_), NULL,
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(), NULL, rect->left,
rect->top, rect->right - rect->left,
rect->bottom - rect->top, SWP_NOZORDER | SWP_NOACTIVATE);
}
break;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
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