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electron/shell/browser/native_window_views_win.cc
Heilig Benedek d04072d1eb fix: don't call SetBounds on restore (#19886)
2019-08-26 14:04:20 -07:00

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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 "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/common/atom_constants.h"
#include "ui/base/win/accessibility_misc_utils.h"
#include "ui/display/display.h"
#include "ui/display/win/screen_win.h"
#include "ui/gfx/geometry/insets.h"
#include "ui/views/widget/native_widget_private.h"
// Must be included after other Windows headers.
#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";
}
}
bool IsScreenReaderActive() {
UINT screenReader = 0;
SystemParametersInfo(SPI_GETSCREENREADER, 0, &screenReader, 0);
return screenReader && UiaClientsAreListening();
}
// We use "enum" instead of "enum class" because we need to do bitwise compare.
enum AppbarAutohideEdge {
TOP = 1 << 0,
LEFT = 1 << 1,
BOTTOM = 1 << 2,
RIGHT = 1 << 3,
};
// The thickness of an auto-hide taskbar in pixel.
constexpr int kAutoHideTaskbarThicknessPx = 2;
// Code is copied from chrome_views_delegate_win.cc.
bool MonitorHasAutohideTaskbarForEdge(UINT edge, HMONITOR monitor) {
APPBARDATA taskbar_data = {sizeof(APPBARDATA), NULL, 0, edge};
taskbar_data.hWnd = ::GetForegroundWindow();
// MSDN documents an ABM_GETAUTOHIDEBAREX, which supposedly takes a monitor
// rect and returns autohide bars on that monitor. This sounds like a good
// idea for multi-monitor systems. Unfortunately, it appears to not work at
// least some of the time (erroneously returning NULL) and there's almost no
// online documentation or other sample code using it that suggests ways to
// address this problem. We do the following:-
// 1. Use the ABM_GETAUTOHIDEBAR message. If it works, i.e. returns a valid
// window we are done.
// 2. If the ABM_GETAUTOHIDEBAR message does not work we query the auto hide
// state of the taskbar and then retrieve its position. That call returns
// the edge on which the taskbar is present. If it matches the edge we
// are looking for, we are done.
// NOTE: This call spins a nested run loop.
HWND taskbar = reinterpret_cast<HWND>(
SHAppBarMessage(ABM_GETAUTOHIDEBAR, &taskbar_data));
if (!::IsWindow(taskbar)) {
APPBARDATA taskbar_data = {sizeof(APPBARDATA), 0, 0, 0};
unsigned int taskbar_state = SHAppBarMessage(ABM_GETSTATE, &taskbar_data);
if (!(taskbar_state & ABS_AUTOHIDE))
return false;
taskbar_data.hWnd = ::FindWindow(L"Shell_TrayWnd", NULL);
if (!::IsWindow(taskbar_data.hWnd))
return false;
SHAppBarMessage(ABM_GETTASKBARPOS, &taskbar_data);
if (taskbar_data.uEdge == edge)
taskbar = taskbar_data.hWnd;
}
// There is a potential race condition here:
// 1. A maximized chrome window is fullscreened.
// 2. It is switched back to maximized.
// 3. In the process the window gets a WM_NCCACLSIZE message which calls us to
// get the autohide state.
// 4. The worker thread is invoked. It calls the API to get the autohide
// state. On Windows versions earlier than Windows 7, taskbars could
// easily be always on top or not.
// This meant that we only want to look for taskbars which have the topmost
// bit set. However this causes problems in cases where the window on the
// main thread is still in the process of switching away from fullscreen.
// In this case the taskbar might not yet have the topmost bit set.
// 5. The main thread resumes and does not leave space for the taskbar and
// hence it does not pop when hovered.
//
// To address point 4 above, it is best to not check for the WS_EX_TOPMOST
// window style on the taskbar, as starting from Windows 7, the topmost
// style is always set. We don't support XP and Vista anymore.
if (::IsWindow(taskbar)) {
if (MonitorFromWindow(taskbar, MONITOR_DEFAULTTONEAREST) == monitor)
return true;
// In some cases like when the autohide taskbar is on the left of the
// secondary monitor, the MonitorFromWindow call above fails to return the
// correct monitor the taskbar is on. We fallback to MonitorFromPoint for
// the cursor position in that case, which seems to work well.
POINT cursor_pos = {0};
GetCursorPos(&cursor_pos);
if (MonitorFromPoint(cursor_pos, MONITOR_DEFAULTTONEAREST) == monitor)
return true;
}
return false;
}
int GetAppbarAutohideEdges(HWND hwnd) {
HMONITOR monitor = MonitorFromWindow(hwnd, MONITOR_DEFAULTTONULL);
if (!monitor)
return 0;
int edges = 0;
if (MonitorHasAutohideTaskbarForEdge(ABE_LEFT, monitor))
edges |= AppbarAutohideEdge::LEFT;
if (MonitorHasAutohideTaskbarForEdge(ABE_TOP, monitor))
edges |= AppbarAutohideEdge::TOP;
if (MonitorHasAutohideTaskbarForEdge(ABE_RIGHT, monitor))
edges |= AppbarAutohideEdge::RIGHT;
if (MonitorHasAutohideTaskbarForEdge(ABE_BOTTOM, monitor))
edges |= AppbarAutohideEdge::BOTTOM;
return edges;
}
void TriggerNCCalcSize(HWND hwnd) {
RECT rcClient;
::GetWindowRect(hwnd, &rcClient);
::SetWindowPos(hwnd, NULL, rcClient.left, rcClient.top,
rcClient.right - rcClient.left, rcClient.bottom - rcClient.top,
SWP_FRAMECHANGED);
}
} // namespace
std::set<NativeWindowViews*> NativeWindowViews::forwarding_windows_;
HHOOK NativeWindowViews::mouse_hook_ = NULL;
void NativeWindowViews::Maximize() {
int autohide_edges = 0;
if (!has_frame())
autohide_edges = GetAppbarAutohideEdges(GetAcceleratedWidget());
// Only use Maximize() when:
// 1. window has WS_THICKFRAME style;
// 2. and window is not frameless when there is autohide taskbar.
if ((::GetWindowLong(GetAcceleratedWidget(), GWL_STYLE) & WS_THICKFRAME) &&
(has_frame() || autohide_edges == 0)) {
if (IsVisible())
widget()->Maximize();
else
widget()->native_widget_private()->Show(ui::SHOW_STATE_MAXIMIZED,
gfx::Rect());
return;
}
gfx::Insets insets;
if (!has_frame()) {
// When taskbar is autohide, we need to leave some space so the window
// isn't treated as a "fullscreen app", which would cause the taskbars
// to disappear.
//
// This trick comes from hwnd_message_handler.cc. While Chromium already
// does this for normal window, somehow it is not applying the trick when
// using frameless window, and we have to do it ourselves.
float scale_factor =
display::win::ScreenWin::GetScaleFactorForHWND(GetAcceleratedWidget());
int thickness = std::ceil(kAutoHideTaskbarThicknessPx / scale_factor);
if (autohide_edges & AppbarAutohideEdge::LEFT)
insets.set_left(-thickness);
if (autohide_edges & AppbarAutohideEdge::TOP)
insets.set_top(-thickness);
if (autohide_edges & AppbarAutohideEdge::RIGHT)
insets.set_right(thickness);
if (autohide_edges & AppbarAutohideEdge::BOTTOM)
insets.set_bottom(thickness);
}
restore_bounds_ = GetBounds();
auto display =
display::Screen::GetScreen()->GetDisplayNearestPoint(GetPosition());
gfx::Rect bounds = display.work_area();
bounds.Inset(insets);
SetBounds(bounds, false);
}
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);
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() &&
GetWindowPlacement(GetAcceleratedWidget(), &wp)) {
last_normal_placement_bounds_.set_size(gfx::Size(0, 0));
wp.rcNormalPosition = last_normal_placement_bounds_.ToRECT();
SetWindowPlacement(GetAcceleratedWidget(), &wp);
last_normal_placement_bounds_ = gfx::Rect();
}
return false;
}
case WM_NCCALCSIZE: {
if (!has_frame() && w_param == TRUE) {
NCCALCSIZE_PARAMS* params =
reinterpret_cast<NCCALCSIZE_PARAMS*>(l_param);
RECT PROPOSED = params->rgrc[0];
RECT BEFORE = params->rgrc[1];
// We need to call the default to have cascade and tile windows
// working
// (https://github.com/rossy/borderless-window/blob/master/borderless-window.c#L239),
// but we need to provide the proposed original value as suggested in
// https://blogs.msdn.microsoft.com/wpfsdk/2008/09/08/custom-window-chrome-in-wpf/
DefWindowProcW(GetAcceleratedWidget(), WM_NCCALCSIZE, w_param, l_param);
if (last_window_state_ == ui::SHOW_STATE_MAXIMIZED) {
params->rgrc[0].top = 0;
} else {
params->rgrc[0] = PROPOSED;
params->rgrc[1] = BEFORE;
}
return true;
} else {
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: {
bool prevent_default = false;
NotifyWindowWillResize(gfx::Rect(*reinterpret_cast<RECT*>(l_param)),
&prevent_default);
if (prevent_default) {
::GetWindowRect(GetAcceleratedWidget(),
reinterpret_cast<RECT*>(l_param));
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_MOVING: {
bool prevent_default = false;
NotifyWindowWillMove(gfx::Rect(*reinterpret_cast<RECT*>(l_param)),
&prevent_default);
if (!movable_ || prevent_default) {
::GetWindowRect(GetAcceleratedWidget(),
reinterpret_cast<RECT*>(l_param));
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;
}
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: {
last_window_state_ = ui::SHOW_STATE_MAXIMIZED;
if (!has_frame()) {
TriggerNCCalcSize(GetAcceleratedWidget());
}
NotifyWindowMaximize();
break;
}
case SIZE_MINIMIZED:
last_window_state_ = ui::SHOW_STATE_MINIMIZED;
WINDOWPLACEMENT wp;
wp.length = sizeof(WINDOWPLACEMENT);
if (GetWindowPlacement(GetAcceleratedWidget(), &wp)) {
last_normal_placement_bounds_ = gfx::Rect(wp.rcNormalPosition);
}
NotifyWindowMinimize();
break;
case SIZE_RESTORED:
switch (last_window_state_) {
case ui::SHOW_STATE_MAXIMIZED:
last_window_state_ = ui::SHOW_STATE_NORMAL;
NotifyWindowUnmaximize();
if (!has_frame()) {
TriggerNCCalcSize(GetAcceleratedWidget());
}
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;
}
break;
}
}
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, NULL, 0);
}
} else if (!forward && forwarding_mouse_messages_) {
forwarding_mouse_messages_ = false;
forwarding_windows_.erase(this);
RemoveWindowSubclass(legacy_window_, SubclassProc, 1);
if (forwarding_windows_.size() == 0) {
UnhookWindowsHookEx(mouse_hook_);
mouse_hook_ = NULL;
}
}
}
LRESULT CALLBACK NativeWindowViews::SubclassProc(HWND hwnd,
UINT msg,
WPARAM w_param,
LPARAM l_param,
UINT_PTR subclass_id,
DWORD_PTR ref_data) {
NativeWindowViews* 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 catched 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(NULL, 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(NULL, n_code, w_param, l_param);
}
} // namespace electron
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