c8dc2d3730
The new `will-resize` event can be used to prevent the resize from happening before the native window is actually resized. This is in contrast to the existing the `resize` event, which is sent *after* the native window has already been resized. For apps with e.g. custom window snapping logic, the `resize` event is not sufficient because it will result in flickering between the dragged size and the snapped size. `will-resize` is only emitted on macOS and Windows.
386 lines
13 KiB
C++
386 lines
13 KiB
C++
// Copyright (c) 2015 GitHub, Inc.
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// Use of this source code is governed by the MIT license that can be
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// found in the LICENSE file.
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#include "atom/browser/browser.h"
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#include "atom/browser/native_window_views.h"
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#include "content/public/browser/browser_accessibility_state.h"
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#include "ui/base/win/accessibility_misc_utils.h"
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// Must be included after other Windows headers.
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#include <UIAutomationCoreApi.h>
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namespace atom {
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namespace {
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// Convert Win32 WM_APPCOMMANDS to strings.
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const char* AppCommandToString(int command_id) {
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switch (command_id) {
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case APPCOMMAND_BROWSER_BACKWARD:
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return "browser-backward";
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case APPCOMMAND_BROWSER_FORWARD:
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return "browser-forward";
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case APPCOMMAND_BROWSER_REFRESH:
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return "browser-refresh";
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case APPCOMMAND_BROWSER_STOP:
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return "browser-stop";
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case APPCOMMAND_BROWSER_SEARCH:
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return "browser-search";
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case APPCOMMAND_BROWSER_FAVORITES:
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return "browser-favorites";
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case APPCOMMAND_BROWSER_HOME:
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return "browser-home";
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case APPCOMMAND_VOLUME_MUTE:
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return "volume-mute";
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case APPCOMMAND_VOLUME_DOWN:
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return "volume-down";
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case APPCOMMAND_VOLUME_UP:
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return "volume-up";
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case APPCOMMAND_MEDIA_NEXTTRACK:
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return "media-nexttrack";
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case APPCOMMAND_MEDIA_PREVIOUSTRACK:
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return "media-previoustrack";
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case APPCOMMAND_MEDIA_STOP:
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return "media-stop";
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case APPCOMMAND_MEDIA_PLAY_PAUSE:
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return "media-play-pause";
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case APPCOMMAND_LAUNCH_MAIL:
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return "launch-mail";
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case APPCOMMAND_LAUNCH_MEDIA_SELECT:
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return "launch-media-select";
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case APPCOMMAND_LAUNCH_APP1:
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return "launch-app1";
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case APPCOMMAND_LAUNCH_APP2:
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return "launch-app2";
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case APPCOMMAND_BASS_DOWN:
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return "bass-down";
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case APPCOMMAND_BASS_BOOST:
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return "bass-boost";
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case APPCOMMAND_BASS_UP:
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return "bass-up";
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case APPCOMMAND_TREBLE_DOWN:
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return "treble-down";
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case APPCOMMAND_TREBLE_UP:
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return "treble-up";
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case APPCOMMAND_MICROPHONE_VOLUME_MUTE:
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return "microphone-volume-mute";
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case APPCOMMAND_MICROPHONE_VOLUME_DOWN:
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return "microphone-volume-down";
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case APPCOMMAND_MICROPHONE_VOLUME_UP:
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return "microphone-volume-up";
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case APPCOMMAND_HELP:
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return "help";
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case APPCOMMAND_FIND:
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return "find";
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case APPCOMMAND_NEW:
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return "new";
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case APPCOMMAND_OPEN:
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return "open";
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case APPCOMMAND_CLOSE:
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return "close";
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case APPCOMMAND_SAVE:
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return "save";
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case APPCOMMAND_PRINT:
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return "print";
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case APPCOMMAND_UNDO:
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return "undo";
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case APPCOMMAND_REDO:
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return "redo";
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case APPCOMMAND_COPY:
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return "copy";
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case APPCOMMAND_CUT:
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return "cut";
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case APPCOMMAND_PASTE:
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return "paste";
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case APPCOMMAND_REPLY_TO_MAIL:
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return "reply-to-mail";
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case APPCOMMAND_FORWARD_MAIL:
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return "forward-mail";
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case APPCOMMAND_SEND_MAIL:
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return "send-mail";
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case APPCOMMAND_SPELL_CHECK:
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return "spell-check";
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case APPCOMMAND_MIC_ON_OFF_TOGGLE:
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return "mic-on-off-toggle";
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case APPCOMMAND_CORRECTION_LIST:
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return "correction-list";
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case APPCOMMAND_MEDIA_PLAY:
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return "media-play";
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case APPCOMMAND_MEDIA_PAUSE:
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return "media-pause";
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case APPCOMMAND_MEDIA_RECORD:
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return "media-record";
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case APPCOMMAND_MEDIA_FAST_FORWARD:
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return "media-fast-forward";
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case APPCOMMAND_MEDIA_REWIND:
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return "media-rewind";
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case APPCOMMAND_MEDIA_CHANNEL_UP:
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return "media-channel-up";
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case APPCOMMAND_MEDIA_CHANNEL_DOWN:
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return "media-channel-down";
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case APPCOMMAND_DELETE:
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return "delete";
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case APPCOMMAND_DICTATE_OR_COMMAND_CONTROL_TOGGLE:
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return "dictate-or-command-control-toggle";
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default:
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return "unknown";
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}
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}
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bool IsScreenReaderActive() {
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UINT screenReader = 0;
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SystemParametersInfo(SPI_GETSCREENREADER, 0, &screenReader, 0);
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return screenReader && UiaClientsAreListening();
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}
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} // namespace
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std::set<NativeWindowViews*> NativeWindowViews::forwarding_windows_;
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HHOOK NativeWindowViews::mouse_hook_ = NULL;
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bool NativeWindowViews::ExecuteWindowsCommand(int command_id) {
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std::string command = AppCommandToString(command_id);
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NotifyWindowExecuteWindowsCommand(command);
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return false;
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}
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bool NativeWindowViews::PreHandleMSG(UINT message,
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WPARAM w_param,
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LPARAM l_param,
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LRESULT* result) {
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NotifyWindowMessage(message, w_param, l_param);
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switch (message) {
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// Screen readers send WM_GETOBJECT in order to get the accessibility
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// object, so take this opportunity to push Chromium into accessible
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// mode if it isn't already, always say we didn't handle the message
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// because we still want Chromium to handle returning the actual
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// accessibility object.
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case WM_GETOBJECT: {
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if (checked_for_a11y_support_)
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return false;
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const DWORD obj_id = static_cast<DWORD>(l_param);
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if (obj_id != static_cast<DWORD>(OBJID_CLIENT)) {
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return false;
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}
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if (!IsScreenReaderActive()) {
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return false;
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}
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checked_for_a11y_support_ = true;
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auto* const axState = content::BrowserAccessibilityState::GetInstance();
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if (axState && !axState->IsAccessibleBrowser()) {
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axState->OnScreenReaderDetected();
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Browser::Get()->OnAccessibilitySupportChanged();
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}
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return false;
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}
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case WM_COMMAND:
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// Handle thumbar button click message.
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if (HIWORD(w_param) == THBN_CLICKED)
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return taskbar_host_.HandleThumbarButtonEvent(LOWORD(w_param));
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return false;
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case WM_SIZING: {
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bool prevent_default = false;
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NotifyWindowWillResize(gfx::Rect(*reinterpret_cast<RECT*>(l_param)),
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&prevent_default);
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if (prevent_default) {
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::GetWindowRect(GetAcceleratedWidget(),
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reinterpret_cast<RECT*>(l_param));
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}
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return false;
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}
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case WM_SIZE: {
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// Handle window state change.
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HandleSizeEvent(w_param, l_param);
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consecutive_moves_ = false;
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last_normal_bounds_before_move_ = last_normal_bounds_;
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return false;
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}
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case WM_MOVING: {
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if (!movable_)
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::GetWindowRect(GetAcceleratedWidget(),
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reinterpret_cast<RECT*>(l_param));
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return false;
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}
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case WM_MOVE: {
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if (last_window_state_ == ui::SHOW_STATE_NORMAL) {
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if (consecutive_moves_)
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last_normal_bounds_ = last_normal_bounds_candidate_;
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last_normal_bounds_candidate_ = GetBounds();
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consecutive_moves_ = true;
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}
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return false;
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}
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case WM_ENDSESSION: {
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if (w_param) {
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NotifyWindowEndSession();
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}
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return false;
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}
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case WM_PARENTNOTIFY: {
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if (LOWORD(w_param) == WM_CREATE) {
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// Because of reasons regarding legacy drivers and stuff, a window that
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// matches the client area is created and used internally by Chromium.
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// This is used when forwarding mouse messages. We only cache the first
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// occurrence (the webview window) because dev tools also cause this
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// message to be sent.
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if (!legacy_window_) {
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legacy_window_ = reinterpret_cast<HWND>(l_param);
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}
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}
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return false;
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}
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default:
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return false;
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}
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}
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void NativeWindowViews::HandleSizeEvent(WPARAM w_param, LPARAM l_param) {
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// Here we handle the WM_SIZE event in order to figure out what is the current
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// window state and notify the user accordingly.
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switch (w_param) {
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case SIZE_MAXIMIZED:
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last_window_state_ = ui::SHOW_STATE_MAXIMIZED;
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if (consecutive_moves_) {
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last_normal_bounds_ = last_normal_bounds_before_move_;
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}
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NotifyWindowMaximize();
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break;
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case SIZE_MINIMIZED:
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last_window_state_ = ui::SHOW_STATE_MINIMIZED;
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NotifyWindowMinimize();
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break;
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case SIZE_RESTORED:
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if (last_window_state_ == ui::SHOW_STATE_NORMAL) {
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// Window was resized so we save it's new size.
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last_normal_bounds_ = GetBounds();
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last_normal_bounds_before_move_ = last_normal_bounds_;
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} else {
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switch (last_window_state_) {
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case ui::SHOW_STATE_MAXIMIZED:
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last_window_state_ = ui::SHOW_STATE_NORMAL;
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// Don't force out last known bounds onto the window as Windows
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// actually gets these correct
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NotifyWindowUnmaximize();
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break;
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case ui::SHOW_STATE_MINIMIZED:
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if (IsFullscreen()) {
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last_window_state_ = ui::SHOW_STATE_FULLSCREEN;
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NotifyWindowEnterFullScreen();
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} else {
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last_window_state_ = ui::SHOW_STATE_NORMAL;
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// When the window is restored we resize it to the previous known
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// normal size.
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SetBounds(last_normal_bounds_, false);
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NotifyWindowRestore();
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}
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break;
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default:
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break;
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}
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}
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break;
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}
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}
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void NativeWindowViews::SetForwardMouseMessages(bool forward) {
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if (forward && !forwarding_mouse_messages_) {
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forwarding_mouse_messages_ = true;
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forwarding_windows_.insert(this);
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// Subclassing is used to fix some issues when forwarding mouse messages;
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// see comments in |SubclassProc|.
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SetWindowSubclass(legacy_window_, SubclassProc, 1,
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reinterpret_cast<DWORD_PTR>(this));
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if (!mouse_hook_) {
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mouse_hook_ = SetWindowsHookEx(WH_MOUSE_LL, MouseHookProc, NULL, 0);
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}
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} else if (!forward && forwarding_mouse_messages_) {
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forwarding_mouse_messages_ = false;
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forwarding_windows_.erase(this);
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RemoveWindowSubclass(legacy_window_, SubclassProc, 1);
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if (forwarding_windows_.size() == 0) {
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UnhookWindowsHookEx(mouse_hook_);
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mouse_hook_ = NULL;
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}
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}
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}
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LRESULT CALLBACK NativeWindowViews::SubclassProc(HWND hwnd,
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UINT msg,
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WPARAM w_param,
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LPARAM l_param,
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UINT_PTR subclass_id,
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DWORD_PTR ref_data) {
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NativeWindowViews* window = reinterpret_cast<NativeWindowViews*>(ref_data);
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switch (msg) {
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case WM_MOUSELEAVE: {
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// When input is forwarded to underlying windows, this message is posted.
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// If not handled, it interferes with Chromium logic, causing for example
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// mouseleave events to fire. If those events are used to exit forward
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// mode, excessive flickering on for example hover items in underlying
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// windows can occur due to rapidly entering and leaving forwarding mode.
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// By consuming and ignoring the message, we're essentially telling
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// Chromium that we have not left the window despite somebody else getting
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// the messages. As to why this is catched for the legacy window and not
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// the actual browser window is simply that the legacy window somehow
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// makes use of these events; posting to the main window didn't work.
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if (window->forwarding_mouse_messages_) {
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return 0;
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}
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break;
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}
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}
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return DefSubclassProc(hwnd, msg, w_param, l_param);
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}
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LRESULT CALLBACK NativeWindowViews::MouseHookProc(int n_code,
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WPARAM w_param,
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LPARAM l_param) {
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if (n_code < 0) {
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return CallNextHookEx(NULL, n_code, w_param, l_param);
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}
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// Post a WM_MOUSEMOVE message for those windows whose client area contains
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// the cursor since they are in a state where they would otherwise ignore all
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// mouse input.
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if (w_param == WM_MOUSEMOVE) {
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for (auto* window : forwarding_windows_) {
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// At first I considered enumerating windows to check whether the cursor
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// was directly above the window, but since nothing bad seems to happen
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// if we post the message even if some other window occludes it I have
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// just left it as is.
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RECT client_rect;
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GetClientRect(window->legacy_window_, &client_rect);
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POINT p = reinterpret_cast<MSLLHOOKSTRUCT*>(l_param)->pt;
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ScreenToClient(window->legacy_window_, &p);
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if (PtInRect(&client_rect, p)) {
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WPARAM w = 0; // No virtual keys pressed for our purposes
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LPARAM l = MAKELPARAM(p.x, p.y);
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PostMessage(window->legacy_window_, WM_MOUSEMOVE, w, l);
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}
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}
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}
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return CallNextHookEx(NULL, n_code, w_param, l_param);
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}
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} // namespace atom
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