servoshell/desktop/

headed_window.rs

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */

//! A winit window implementation.

#![deny(clippy::panic)]
#![deny(clippy::unwrap_used)]

use std::cell::{Cell, RefCell};
use std::collections::HashMap;
use std::env;
use std::rc::Rc;
use std::time::Duration;

use euclid::{Angle, Length, Point2D, Rect, Rotation3D, Scale, Size2D, UnknownUnit, Vector3D};
use keyboard_types::ShortcutMatcher;
use log::{debug, info};
use raw_window_handle::{HasDisplayHandle, HasWindowHandle, RawWindowHandle};
use servo::{
    AuthenticationRequest, BluetoothDeviceSelectionRequest, Cursor, DeviceIndependentIntRect,
    DeviceIndependentPixel, DeviceIntPoint, DeviceIntRect, DeviceIntSize, DevicePixel, DevicePoint,
    EmbedderControl, EmbedderControlId, ImeEvent, InputEvent, InputEventId, InputEventResult,
    InputMethodControl, Key, KeyState, KeyboardEvent, Modifiers, MouseButton as ServoMouseButton,
    MouseButtonAction, MouseButtonEvent, MouseLeftViewportEvent, MouseMoveEvent, NamedKey,
    OffscreenRenderingContext, PermissionRequest, RenderingContext, ScreenGeometry, Theme,
    TouchEvent, TouchEventType, TouchId, WebRenderDebugOption, WebView, WebViewId, WheelDelta,
    WheelEvent, WheelMode, WindowRenderingContext, convert_rect_to_css_pixel,
};
use url::Url;
use winit::dpi::{LogicalPosition, LogicalSize, PhysicalPosition, PhysicalSize};
use winit::event::{
    ElementState, Ime, KeyEvent, MouseButton, MouseScrollDelta, TouchPhase, WindowEvent,
};
use winit::event_loop::{ActiveEventLoop, EventLoopProxy};
use winit::keyboard::{Key as LogicalKey, ModifiersState, NamedKey as WinitNamedKey};
#[cfg(target_os = "linux")]
use winit::platform::wayland::WindowAttributesExtWayland;
#[cfg(any(target_os = "linux", target_os = "windows"))]
use winit::window::Icon;
#[cfg(target_os = "macos")]
use {
    objc2_app_kit::{NSColorSpace, NSView},
    objc2_foundation::MainThreadMarker,
};

use super::geometry::{winit_position_to_euclid_point, winit_size_to_euclid_size};
use super::keyutils::{CMD_OR_ALT, keyboard_event_from_winit};
use crate::desktop::accelerated_gl_media::setup_gl_accelerated_media;
use crate::desktop::dialog::Dialog;
use crate::desktop::event_loop::AppEvent;
use crate::desktop::gui::Gui;
use crate::desktop::keyutils::CMD_OR_CONTROL;
use crate::prefs::ServoShellPreferences;
use crate::running_app_state::{RunningAppState, UserInterfaceCommand};
use crate::window::{
    LINE_HEIGHT, LINE_WIDTH, MIN_WINDOW_INNER_SIZE, PlatformWindow, ServoShellWindow,
    ServoShellWindowId,
};

pub(crate) const INITIAL_WINDOW_TITLE: &str = "Servo";

pub struct HeadedWindow {
    /// The egui interface that is responsible for showing the user interface elements of
    /// this headed `Window`.
    gui: RefCell<Gui>,
    screen_size: Size2D<u32, DeviceIndependentPixel>,
    monitor: winit::monitor::MonitorHandle,
    webview_relative_mouse_point: Cell<Point2D<f32, DevicePixel>>,
    /// The inner size of the window in physical pixels which excludes OS decorations.
    /// It equals viewport size + (0, toolbar height).
    inner_size: Cell<PhysicalSize<u32>>,
    fullscreen: Cell<bool>,
    device_pixel_ratio_override: Option<f32>,
    xr_window_poses: RefCell<Vec<Rc<XRWindowPose>>>,
    modifiers_state: Cell<ModifiersState>,
    /// The `RenderingContext` of Servo itself. This is used to render Servo results
    /// temporarily until they can be blitted into the egui scene.
    rendering_context: Rc<OffscreenRenderingContext>,
    /// The RenderingContext that renders directly onto the Window. This is used as
    /// the target of egui rendering and also where Servo rendering results are finally
    /// blitted.
    window_rendering_context: Rc<WindowRenderingContext>,
    /// A helper that simulates touch events when the `--simulate-touch-events` flag
    /// is enabled.
    touch_event_simulator: Option<TouchEventSimulator>,
    /// Keyboard events that have been sent to Servo that have still not been handled yet.
    /// When these are handled, they will optionally be used to trigger keybindings that
    /// are overridable by web content.
    pending_keyboard_events: RefCell<HashMap<InputEventId, KeyboardEvent>>,
    // Keep this as the last field of the struct to ensure that the rendering context is
    // dropped first.
    // (https://github.com/servo/servo/issues/36711)
    winit_window: winit::window::Window,
    /// The last title set on this window. We need to store this value here, as `winit::Window::title`
    /// is not supported very many platforms.
    last_title: RefCell<String>,
    /// The current set of open dialogs.
    dialogs: RefCell<HashMap<WebViewId, Vec<Dialog>>>,
    /// The [`EmbedderControlId`] of the currently showing [`InputMethod`] interfaces,
    /// if one is showing.
    visible_input_method: Cell<Option<EmbedderControlId>>,
    /// The position of the mouse cursor after the most recent `MouseMove` event.
    last_mouse_position: Cell<Option<Point2D<f32, DeviceIndependentPixel>>>,
}

impl HeadedWindow {
    #[servo::servo_tracing::instrument(level = "debug", name = "HeadedWindow::new", skip_all)]
    pub(crate) fn new(
        servoshell_preferences: &ServoShellPreferences,
        event_loop: &ActiveEventLoop,
        event_loop_proxy: EventLoopProxy<AppEvent>,
        initial_url: Url,
    ) -> Rc<Self> {
        let no_native_titlebar = servoshell_preferences.no_native_titlebar;
        let inner_size = servoshell_preferences.initial_window_size;
        let window_attr = winit::window::Window::default_attributes()
            .with_title(INITIAL_WINDOW_TITLE.to_string())
            .with_decorations(!no_native_titlebar)
            .with_transparent(no_native_titlebar)
            .with_inner_size(LogicalSize::new(inner_size.width, inner_size.height))
            .with_min_inner_size(LogicalSize::new(
                MIN_WINDOW_INNER_SIZE.width,
                MIN_WINDOW_INNER_SIZE.height,
            ))
            // Must be invisible at startup; accesskit_winit setup needs to
            // happen before the window is shown for the first time.
            .with_visible(false);

        // Set a name so it can be pinned to taskbars in Linux.
        #[cfg(target_os = "linux")]
        let window_attr = window_attr.with_name("org.servo.Servo", "Servo");

        #[allow(deprecated)]
        let winit_window = event_loop
            .create_window(window_attr)
            .expect("Failed to create window.");

        #[cfg(any(target_os = "linux", target_os = "windows"))]
        {
            let icon_bytes = include_bytes!("../../../resources/servo_64.png");
            winit_window.set_window_icon(Some(load_icon(icon_bytes)));
        }

        let window_handle = winit_window
            .window_handle()
            .expect("winit window did not have a window handle");
        HeadedWindow::force_srgb_color_space(window_handle.as_raw());

        let monitor = winit_window
            .current_monitor()
            .or_else(|| winit_window.available_monitors().nth(0))
            .expect("No monitor detected");

        let (screen_size, screen_scale) = servoshell_preferences.screen_size_override.map_or_else(
            || (monitor.size(), winit_window.scale_factor()),
            |size| (PhysicalSize::new(size.width, size.height), 1.0),
        );
        let screen_scale: Scale<f64, DeviceIndependentPixel, DevicePixel> =
            Scale::new(screen_scale);
        let screen_size = (winit_size_to_euclid_size(screen_size).to_f64() / screen_scale).to_u32();
        let inner_size = winit_window.inner_size();

        let display_handle = event_loop
            .display_handle()
            .expect("could not get display handle from window");
        let window_handle = winit_window
            .window_handle()
            .expect("could not get window handle from window");
        let window_rendering_context = Rc::new(
            WindowRenderingContext::new(display_handle, window_handle, inner_size)
                .expect("Could not create RenderingContext for Window"),
        );

        // Setup for GL accelerated media handling. This is only active on certain Linux platforms
        // and Windows.
        {
            let details = window_rendering_context.surfman_details();
            setup_gl_accelerated_media(details.0, details.1);
        }

        // Make sure the gl context is made current.
        window_rendering_context
            .make_current()
            .expect("Could not make window RenderingContext current");

        let rendering_context = Rc::new(window_rendering_context.offscreen_context(inner_size));
        let gui = RefCell::new(Gui::new(
            &winit_window,
            event_loop,
            event_loop_proxy,
            rendering_context.clone(),
            initial_url,
        ));

        debug!("Created window {:?}", winit_window.id());
        Rc::new(HeadedWindow {
            gui,
            winit_window,
            webview_relative_mouse_point: Cell::new(Point2D::zero()),
            fullscreen: Cell::new(false),
            inner_size: Cell::new(inner_size),
            monitor,
            screen_size,
            device_pixel_ratio_override: servoshell_preferences.device_pixel_ratio_override,
            xr_window_poses: RefCell::new(vec![]),
            modifiers_state: Cell::new(ModifiersState::empty()),
            window_rendering_context,
            touch_event_simulator: servoshell_preferences
                .simulate_touch_events
                .then(Default::default),
            pending_keyboard_events: Default::default(),
            rendering_context,
            last_title: RefCell::new(String::from(INITIAL_WINDOW_TITLE)),
            dialogs: Default::default(),
            visible_input_method: Default::default(),
            last_mouse_position: Default::default(),
        })
    }

    pub(crate) fn winit_window(&self) -> &winit::window::Window {
        &self.winit_window
    }

    fn handle_keyboard_input(
        &self,
        state: Rc<RunningAppState>,
        window: &ServoShellWindow,
        winit_event: KeyEvent,
    ) {
        // First, handle servoshell key bindings that are not overridable by, or visible to, the page.
        let keyboard_event = keyboard_event_from_winit(&winit_event, self.modifiers_state.get());
        if self.handle_intercepted_key_bindings(state, window, &keyboard_event) {
            return;
        }

        // Then we deliver character and keyboard events to the page in the active webview.
        let Some(webview) = window.active_webview() else {
            return;
        };

        for xr_window_pose in self.xr_window_poses.borrow().iter() {
            xr_window_pose.handle_xr_rotation(&winit_event, self.modifiers_state.get());
            xr_window_pose.handle_xr_translation(&keyboard_event);
        }

        let id = webview.notify_input_event(InputEvent::Keyboard(keyboard_event.clone()));
        self.pending_keyboard_events
            .borrow_mut()
            .insert(id, keyboard_event);
    }

    /// Helper function to handle a click
    fn handle_mouse_button_event(
        &self,
        webview: &WebView,
        button: MouseButton,
        action: ElementState,
    ) {
        // `point` can be outside viewport, such as at toolbar with negative y-coordinate.
        let point = self.webview_relative_mouse_point.get();
        let webview_rect: Rect<_, _> = webview.size().into();
        if !webview_rect.contains(point) {
            return;
        }

        if self
            .touch_event_simulator
            .as_ref()
            .is_some_and(|touch_event_simulator| {
                touch_event_simulator
                    .maybe_consume_move_button_event(webview, button, action, point)
            })
        {
            return;
        }

        let mouse_button = match &button {
            MouseButton::Left => ServoMouseButton::Left,
            MouseButton::Right => ServoMouseButton::Right,
            MouseButton::Middle => ServoMouseButton::Middle,
            MouseButton::Back => ServoMouseButton::Back,
            MouseButton::Forward => ServoMouseButton::Forward,
            MouseButton::Other(value) => ServoMouseButton::Other(*value),
        };

        let action = match action {
            ElementState::Pressed => MouseButtonAction::Down,
            ElementState::Released => MouseButtonAction::Up,
        };

        webview.notify_input_event(InputEvent::MouseButton(MouseButtonEvent::new(
            action,
            mouse_button,
            point.into(),
        )));
    }

    /// Helper function to handle mouse move events.
    fn handle_mouse_move_event(&self, webview: &WebView, position: PhysicalPosition<f64>) {
        let mut point = winit_position_to_euclid_point(position).to_f32();
        point.y -= (self.toolbar_height() * self.hidpi_scale_factor()).0;

        let previous_point = self.webview_relative_mouse_point.get();
        self.webview_relative_mouse_point.set(point);

        let webview_rect: Rect<_, _> = webview.size().into();
        if !webview_rect.contains(point) {
            if webview_rect.contains(previous_point) {
                webview.notify_input_event(InputEvent::MouseLeftViewport(
                    MouseLeftViewportEvent::default(),
                ));
            }
            return;
        }

        if self
            .touch_event_simulator
            .as_ref()
            .is_some_and(|touch_event_simulator| {
                touch_event_simulator.maybe_consume_mouse_move_event(webview, point)
            })
        {
            return;
        }

        webview.notify_input_event(InputEvent::MouseMove(MouseMoveEvent::new(point.into())));
    }

    /// Handle key events before sending them to Servo.
    fn handle_intercepted_key_bindings(
        &self,
        state: Rc<RunningAppState>,
        window: &ServoShellWindow,
        key_event: &KeyboardEvent,
    ) -> bool {
        let Some(active_webview) = window.active_webview() else {
            return false;
        };

        let mut handled = true;
        ShortcutMatcher::from_event(key_event.event.clone())
            .shortcut(CMD_OR_CONTROL, 'W', || {
                window.close_webview(active_webview.id());
            })
            .shortcut(CMD_OR_CONTROL, 'P', || {
                let rate = env::var("SAMPLING_RATE")
                    .ok()
                    .and_then(|s| s.parse().ok())
                    .unwrap_or(10);
                let duration = env::var("SAMPLING_DURATION")
                    .ok()
                    .and_then(|s| s.parse().ok())
                    .unwrap_or(10);
                active_webview.toggle_sampling_profiler(
                    Duration::from_millis(rate),
                    Duration::from_secs(duration),
                );
            })
            .shortcut(CMD_OR_CONTROL, 'X', || {
                active_webview
                    .notify_input_event(InputEvent::EditingAction(servo::EditingActionEvent::Cut));
            })
            .shortcut(CMD_OR_CONTROL, 'C', || {
                active_webview
                    .notify_input_event(InputEvent::EditingAction(servo::EditingActionEvent::Copy));
            })
            .shortcut(CMD_OR_CONTROL, 'V', || {
                active_webview.notify_input_event(InputEvent::EditingAction(
                    servo::EditingActionEvent::Paste,
                ));
            })
            .shortcut(Modifiers::CONTROL, Key::Named(NamedKey::F9), || {
                active_webview.capture_webrender();
            })
            .shortcut(Modifiers::CONTROL, Key::Named(NamedKey::F10), || {
                active_webview.toggle_webrender_debugging(WebRenderDebugOption::RenderTargetDebug);
            })
            .shortcut(Modifiers::CONTROL, Key::Named(NamedKey::F11), || {
                active_webview.toggle_webrender_debugging(WebRenderDebugOption::TextureCacheDebug);
            })
            .shortcut(Modifiers::CONTROL, Key::Named(NamedKey::F12), || {
                active_webview.toggle_webrender_debugging(WebRenderDebugOption::Profiler);
            })
            .shortcut(CMD_OR_ALT, Key::Named(NamedKey::ArrowRight), || {
                active_webview.go_forward(1);
            })
            .optional_shortcut(
                cfg!(not(target_os = "windows")),
                CMD_OR_CONTROL,
                ']',
                || {
                    active_webview.go_forward(1);
                },
            )
            .shortcut(CMD_OR_ALT, Key::Named(NamedKey::ArrowLeft), || {
                active_webview.go_back(1);
            })
            .optional_shortcut(
                cfg!(not(target_os = "windows")),
                CMD_OR_CONTROL,
                '[',
                || {
                    active_webview.go_back(1);
                },
            )
            .optional_shortcut(
                self.get_fullscreen(),
                Modifiers::empty(),
                Key::Named(NamedKey::Escape),
                || active_webview.exit_fullscreen(),
            )
            // Select the first 8 tabs via shortcuts
            .shortcut(CMD_OR_CONTROL, '1', || window.activate_webview_by_index(0))
            .shortcut(CMD_OR_CONTROL, '2', || window.activate_webview_by_index(1))
            .shortcut(CMD_OR_CONTROL, '3', || window.activate_webview_by_index(2))
            .shortcut(CMD_OR_CONTROL, '4', || window.activate_webview_by_index(3))
            .shortcut(CMD_OR_CONTROL, '5', || window.activate_webview_by_index(4))
            .shortcut(CMD_OR_CONTROL, '6', || window.activate_webview_by_index(5))
            .shortcut(CMD_OR_CONTROL, '7', || window.activate_webview_by_index(6))
            .shortcut(CMD_OR_CONTROL, '8', || window.activate_webview_by_index(7))
            // Cmd/Ctrl 9 is a bit different in that it focuses the last tab instead of the 9th
            .shortcut(CMD_OR_CONTROL, '9', || {
                let len = window.webviews().len();
                if len > 0 {
                    window.activate_webview_by_index(len - 1)
                }
            })
            .shortcut(Modifiers::CONTROL, Key::Named(NamedKey::PageDown), || {
                if let Some(index) = window.get_active_webview_index() {
                    window.activate_webview_by_index((index + 1) % window.webviews().len())
                }
            })
            .shortcut(Modifiers::CONTROL, Key::Named(NamedKey::PageUp), || {
                if let Some(index) = window.get_active_webview_index() {
                    let len = window.webviews().len();
                    window.activate_webview_by_index((index + len - 1) % len);
                }
            })
            .shortcut(CMD_OR_CONTROL, 'T', || {
                window.create_and_activate_toplevel_webview(
                    state.clone(),
                    Url::parse("servo:newtab")
                        .expect("Should be able to unconditionally parse 'servo:newtab' as URL"),
                );
            })
            .shortcut(CMD_OR_CONTROL, 'Q', || state.schedule_exit())
            .otherwise(|| handled = false);
        handled
    }

    #[cfg_attr(not(target_os = "macos"), expect(unused_variables))]
    fn force_srgb_color_space(window_handle: RawWindowHandle) {
        #[cfg(target_os = "macos")]
        {
            if let RawWindowHandle::AppKit(handle) = window_handle {
                assert!(MainThreadMarker::new().is_some());
                unsafe {
                    let view = handle.ns_view.cast::<NSView>().as_ref();
                    view.window()
                        .expect("Should have a window")
                        .setColorSpace(Some(&NSColorSpace::sRGBColorSpace()));
                }
            }
        }
    }

    fn show_ime(&self, control_id: EmbedderControlId, input_method: InputMethodControl) {
        self.visible_input_method.set(Some(control_id));

        let position = input_method.position();
        self.winit_window.set_ime_allowed(true);
        self.winit_window.set_ime_cursor_area(
            LogicalPosition::new(
                position.min.x,
                position.min.y + (self.toolbar_height().0 as i32),
            ),
            LogicalSize::new(
                position.max.x - position.min.x,
                position.max.y - position.min.y,
            ),
        );
    }

    pub(crate) fn for_each_active_dialog(
        &self,
        window: &ServoShellWindow,
        callback: impl Fn(&mut Dialog) -> bool,
    ) {
        let Some(active_webview) = window.active_webview() else {
            return;
        };
        let mut dialogs = self.dialogs.borrow_mut();
        let Some(dialogs) = dialogs.get_mut(&active_webview.id()) else {
            return;
        };
        if dialogs.is_empty() {
            return;
        }

        // If a dialog is open, clear any Servo cursor. TODO: This should restore the
        // cursor too, when all dialogs close. In general, we need a better cursor
        // management strategy.
        self.set_cursor(Cursor::Default);

        let length = dialogs.len();
        dialogs.retain_mut(callback);
        if length != dialogs.len() {
            window.set_needs_repaint();
        }
    }

    fn add_dialog(&self, webview_id: WebViewId, dialog: Dialog) {
        self.dialogs
            .borrow_mut()
            .entry(webview_id)
            .or_default()
            .push(dialog)
    }

    fn remove_dialog(&self, webview_id: WebViewId, embedder_control_id: EmbedderControlId) {
        let mut dialogs = self.dialogs.borrow_mut();
        if let Some(dialogs) = dialogs.get_mut(&webview_id) {
            dialogs.retain(|dialog| dialog.embedder_control_id() != Some(embedder_control_id));
        }
        dialogs.retain(|_, dialogs| !dialogs.is_empty());
    }

    fn has_active_dialog_for_webview(&self, webview_id: WebViewId) -> bool {
        // First lazily clean up any empty dialog vectors.
        let mut dialogs = self.dialogs.borrow_mut();
        dialogs.retain(|_, dialogs| !dialogs.is_empty());
        dialogs.contains_key(&webview_id)
    }

    fn toolbar_height(&self) -> Length<f32, DeviceIndependentPixel> {
        self.gui.borrow().toolbar_height()
    }

    pub(crate) fn handle_winit_window_event(
        &self,
        state: Rc<RunningAppState>,
        window: Rc<ServoShellWindow>,
        event: WindowEvent,
    ) {
        if event == WindowEvent::RedrawRequested {
            // WARNING: do not defer painting or presenting to some later tick of the event
            // loop or servoshell may become unresponsive! (servo#30312)
            let mut gui = self.gui.borrow_mut();
            gui.update(&state, &window, self);
            gui.paint(&self.winit_window);
        }

        let forward_mouse_event_to_egui = |point: Option<PhysicalPosition<f64>>| {
            if window
                .active_webview()
                .is_some_and(|webview| self.has_active_dialog_for_webview(webview.id()))
            {
                return true;
            }

            let Some(point) = point
                .map(|point| {
                    winit_position_to_euclid_point(point).to_f32() / self.hidpi_scale_factor()
                })
                .or(self.last_mouse_position.get())
            else {
                return true;
            };

            self.last_mouse_position.set(Some(point));
            self.gui.borrow().is_in_egui_toolbar_rect(point)
        };

        // Handle the event
        let mut consumed = false;
        match event {
            WindowEvent::ScaleFactorChanged { scale_factor, .. } => {
                // Intercept any ScaleFactorChanged events away from EguiGlow::on_window_event, so
                // we can use our own logic for calculating the scale factor and set egui’s
                // scale factor to that value manually.
                let desired_scale_factor = self.hidpi_scale_factor().get();
                let effective_egui_zoom_factor = desired_scale_factor / scale_factor as f32;

                info!(
                    "window scale factor changed to {}, setting egui zoom factor to {}",
                    scale_factor, effective_egui_zoom_factor
                );

                self.gui
                    .borrow()
                    .set_zoom_factor(effective_egui_zoom_factor);

                window.hidpi_scale_factor_changed();

                // Request a winit redraw event, so we can recomposite, update and paint
                // the GUI, and present the new frame.
                self.winit_window.request_redraw();
            },
            WindowEvent::CursorMoved { position, .. }
                if !forward_mouse_event_to_egui(Some(position)) => {},
            WindowEvent::MouseInput {
                state: ElementState::Pressed,
                button: MouseButton::Forward,
                ..
            } => {
                window.queue_user_interface_command(UserInterfaceCommand::Forward);
                consumed = true;
            },
            WindowEvent::MouseInput {
                state: ElementState::Pressed,
                button: MouseButton::Back,
                ..
            } => {
                window.queue_user_interface_command(UserInterfaceCommand::Back);
                consumed = true;
            },
            WindowEvent::MouseWheel { .. } | WindowEvent::MouseInput { .. }
                if !forward_mouse_event_to_egui(None) =>
            {
                self.gui.borrow().surrender_focus();
            },
            WindowEvent::KeyboardInput { .. } if !self.gui.borrow().has_keyboard_focus() => {
                // Keyboard events should go to the WebView unless some other GUI
                // component has keyboard focus.
            },
            ref event => {
                let response = self
                    .gui
                    .borrow_mut()
                    .on_window_event(&self.winit_window, event);

                if let WindowEvent::Resized(_) = event {
                    self.rebuild_user_interface(&state, &window);
                }

                if let WindowEvent::Focused(true) = event {
                    state.handle_focused(window.clone());
                }

                if response.repaint && *event != WindowEvent::RedrawRequested {
                    self.winit_window.request_redraw();
                }

                // TODO how do we handle the tab key? (see doc for consumed)
                // Note that servo doesn’t yet support tabbing through links and inputs
                consumed = response.consumed;
            },
        }

        if !consumed {
            // Make sure to handle early resize events even when there are no webviews yet
            if let WindowEvent::Resized(new_inner_size) = event &&
                self.inner_size.get() != new_inner_size
            {
                self.inner_size.set(new_inner_size);
                // This should always be set to inner size
                // because we are resizing `SurfmanRenderingContext`.
                // See https://github.com/servo/servo/issues/38369#issuecomment-3138378527
                self.window_rendering_context.resize(new_inner_size);
            }

            if let Some(webview) = window.active_webview() {
                match event {
                    WindowEvent::KeyboardInput { event, .. } => {
                        self.handle_keyboard_input(state, &window, event)
                    },
                    WindowEvent::ModifiersChanged(modifiers) => {
                        self.modifiers_state.set(modifiers.state())
                    },
                    WindowEvent::MouseInput { state, button, .. } => {
                        self.handle_mouse_button_event(&webview, button, state);
                    },
                    WindowEvent::CursorMoved { position, .. } => {
                        self.handle_mouse_move_event(&webview, position);
                    },
                    WindowEvent::CursorLeft { .. } => {
                        let webview_rect: Rect<_, _> = webview.size().into();
                        if webview_rect.contains(self.webview_relative_mouse_point.get()) {
                            webview.notify_input_event(InputEvent::MouseLeftViewport(
                                MouseLeftViewportEvent::default(),
                            ));
                        }
                    },
                    WindowEvent::MouseWheel { delta, .. } => {
                        let (delta_x, delta_y, mode) = match delta {
                            MouseScrollDelta::LineDelta(delta_x, delta_y) => (
                                (delta_x * LINE_WIDTH) as f64,
                                (delta_y * LINE_HEIGHT) as f64,
                                WheelMode::DeltaPixel,
                            ),
                            MouseScrollDelta::PixelDelta(delta) => {
                                (delta.x, delta.y, WheelMode::DeltaPixel)
                            },
                        };

                        // Create wheel event before snapping to the major axis of movement
                        let delta = WheelDelta {
                            x: delta_x,
                            y: delta_y,
                            z: 0.0,
                            mode,
                        };
                        let point = self.webview_relative_mouse_point.get();
                        webview.notify_input_event(InputEvent::Wheel(WheelEvent::new(
                            delta,
                            point.into(),
                        )));
                    },
                    WindowEvent::Touch(touch) => {
                        webview.notify_input_event(InputEvent::Touch(TouchEvent::new(
                            winit_phase_to_touch_event_type(touch.phase),
                            TouchId(touch.id as i32),
                            DevicePoint::new(touch.location.x as f32, touch.location.y as f32)
                                .into(),
                        )));
                    },
                    WindowEvent::PinchGesture { delta, .. } => {
                        webview.adjust_pinch_zoom(
                            delta as f32 + 1.0,
                            self.webview_relative_mouse_point.get(),
                        );
                    },
                    WindowEvent::CloseRequested => {
                        window.schedule_close();
                    },
                    WindowEvent::ThemeChanged(theme) => {
                        webview.notify_theme_change(match theme {
                            winit::window::Theme::Light => Theme::Light,
                            winit::window::Theme::Dark => Theme::Dark,
                        });
                    },
                    WindowEvent::Ime(ime) => match ime {
                        Ime::Enabled => {
                            webview.notify_input_event(InputEvent::Ime(ImeEvent::Composition(
                                servo::CompositionEvent {
                                    state: servo::CompositionState::Start,
                                    data: String::new(),
                                },
                            )));
                        },
                        Ime::Preedit(text, _) => {
                            webview.notify_input_event(InputEvent::Ime(ImeEvent::Composition(
                                servo::CompositionEvent {
                                    state: servo::CompositionState::Update,
                                    data: text,
                                },
                            )));
                        },
                        Ime::Commit(text) => {
                            webview.notify_input_event(InputEvent::Ime(ImeEvent::Composition(
                                servo::CompositionEvent {
                                    state: servo::CompositionState::End,
                                    data: text,
                                },
                            )));
                        },
                        Ime::Disabled => {
                            // There are two reasons we receive this message from winit:
                            //
                            // 1. The user dismissed the IME. In that case we want to inform Servo
                            //    so it can unfocus the current editable element.
                            // 2. Servo changed focus and requested that we dismiss the IME, which
                            //    in turn triggers this message. We know this is the case when we don't
                            //    expect any IME to be open and shouldn't send any more messages to
                            //    Servo as it might cause unexpected blurring of the newly focused
                            //    element.
                            if self.visible_input_method.take().is_some() {
                                webview.notify_input_event(InputEvent::Ime(ImeEvent::Dismissed));
                            }
                        },
                    },
                    _ => {},
                }
            }
        }
    }

    pub(crate) fn handle_winit_app_event(&self, state: Rc<RunningAppState>, app_event: AppEvent) {
        if let AppEvent::Accessibility(ref event) = app_event {
            match &event.window_event {
                egui_winit::accesskit_winit::WindowEvent::InitialTreeRequested => {
                    state.set_accessibility_active(true);
                },
                egui_winit::accesskit_winit::WindowEvent::ActionRequested(req) => {
                    if req.target_tree != accesskit::TreeId::ROOT {
                        // TODO(#4344): Forward action to Servo
                    }
                },
                egui_winit::accesskit_winit::WindowEvent::AccessibilityDeactivated => {
                    state.set_accessibility_active(false);
                },
            }

            if self
                .gui
                .borrow_mut()
                .handle_accesskit_event(&event.window_event)
            {
                self.winit_window.request_redraw();
            }
        }
    }
}

impl PlatformWindow for HeadedWindow {
    fn as_headed_window(&self) -> Option<&Self> {
        Some(self)
    }

    fn screen_geometry(&self) -> ScreenGeometry {
        let hidpi_factor = self.hidpi_scale_factor();
        let toolbar_size = Size2D::new(0.0, (self.toolbar_height() * self.hidpi_scale_factor()).0);
        let screen_size = self.screen_size.to_f32() * hidpi_factor;

        // FIXME: In reality, this should subtract screen space used by the system interface
        // elements, but it is difficult to get this value with `winit` currently. See:
        // See https://github.com/rust-windowing/winit/issues/2494
        let available_screen_size = screen_size - toolbar_size;

        let window_rect = DeviceIntRect::from_origin_and_size(
            winit_position_to_euclid_point(self.winit_window.outer_position().unwrap_or_default()),
            winit_size_to_euclid_size(self.winit_window.outer_size()).to_i32(),
        );

        ScreenGeometry {
            size: screen_size.to_i32(),
            available_size: available_screen_size.to_i32(),
            window_rect,
        }
    }

    fn device_hidpi_scale_factor(&self) -> Scale<f32, DeviceIndependentPixel, DevicePixel> {
        Scale::new(self.winit_window.scale_factor() as f32)
    }

    fn hidpi_scale_factor(&self) -> Scale<f32, DeviceIndependentPixel, DevicePixel> {
        self.device_pixel_ratio_override
            .map(Scale::new)
            .unwrap_or_else(|| self.device_hidpi_scale_factor())
    }

    fn rebuild_user_interface(&self, state: &RunningAppState, window: &ServoShellWindow) {
        self.gui.borrow_mut().update(state, window, self);
    }

    fn update_user_interface_state(&self, _: &RunningAppState, window: &ServoShellWindow) -> bool {
        let title = window
            .active_webview()
            .and_then(|webview| {
                webview
                    .page_title()
                    .filter(|title| !title.is_empty())
                    .or_else(|| webview.url().map(|url| url.to_string()))
            })
            .unwrap_or_else(|| INITIAL_WINDOW_TITLE.to_string());
        if title != *self.last_title.borrow() {
            self.winit_window.set_title(&title);
            *self.last_title.borrow_mut() = title;
        }

        self.gui.borrow_mut().update_webview_data(window)
    }

    fn request_repaint(&self, window: &ServoShellWindow) {
        self.winit_window.request_redraw();

        // FIXME: This is a workaround for dialogs, which do not seem to animate, unless we
        // constantly repaint the egui scene.
        if window
            .active_webview()
            .is_some_and(|webview| self.has_active_dialog_for_webview(webview.id()))
        {
            window.set_needs_repaint();
        }
    }

    fn request_resize(&self, _: &WebView, new_outer_size: DeviceIntSize) -> Option<DeviceIntSize> {
        // Allocate space for the window deocrations, but do not let the inner size get
        // smaller than `MIN_WINDOW_INNER_SIZE` or larger than twice the screen size.
        let inner_size = self.winit_window.inner_size();
        let outer_size = self.winit_window.outer_size();
        let decoration_size: DeviceIntSize = Size2D::new(
            outer_size.height - inner_size.height,
            outer_size.width - inner_size.width,
        )
        .cast();

        let screen_size = (self.screen_size.to_f32() * self.hidpi_scale_factor()).to_i32();
        let new_outer_size =
            new_outer_size.clamp(MIN_WINDOW_INNER_SIZE + decoration_size, screen_size * 2);

        if outer_size.width == new_outer_size.width as u32 &&
            outer_size.height == new_outer_size.height as u32
        {
            return Some(new_outer_size);
        }

        let new_inner_size = new_outer_size - decoration_size;
        self.winit_window
            .request_inner_size(PhysicalSize::new(
                new_inner_size.width,
                new_inner_size.height,
            ))
            .map(|resulting_size| {
                DeviceIntSize::new(
                    resulting_size.width as i32 + decoration_size.width,
                    resulting_size.height as i32 + decoration_size.height,
                )
            })
    }

    fn window_rect(&self) -> DeviceIndependentIntRect {
        let outer_size = self.winit_window.outer_size();
        let scale = self.hidpi_scale_factor();

        let outer_size = winit_size_to_euclid_size(outer_size).to_i32();

        let origin = self
            .winit_window
            .outer_position()
            .map(winit_position_to_euclid_point)
            .unwrap_or_default();
        convert_rect_to_css_pixel(
            DeviceIntRect::from_origin_and_size(origin, outer_size),
            scale,
        )
    }

    fn set_position(&self, point: DeviceIntPoint) {
        self.winit_window
            .set_outer_position::<PhysicalPosition<i32>>(PhysicalPosition::new(point.x, point.y))
    }

    fn set_fullscreen(&self, state: bool) {
        if self.fullscreen.get() != state {
            self.winit_window.set_fullscreen(if state {
                Some(winit::window::Fullscreen::Borderless(Some(
                    self.monitor.clone(),
                )))
            } else {
                None
            });
        }
        self.fullscreen.set(state);
    }

    fn get_fullscreen(&self) -> bool {
        self.fullscreen.get()
    }

    fn set_cursor(&self, cursor: Cursor) {
        use winit::window::CursorIcon;

        let winit_cursor = match cursor {
            Cursor::Default => CursorIcon::Default,
            Cursor::Pointer => CursorIcon::Pointer,
            Cursor::ContextMenu => CursorIcon::ContextMenu,
            Cursor::Help => CursorIcon::Help,
            Cursor::Progress => CursorIcon::Progress,
            Cursor::Wait => CursorIcon::Wait,
            Cursor::Cell => CursorIcon::Cell,
            Cursor::Crosshair => CursorIcon::Crosshair,
            Cursor::Text => CursorIcon::Text,
            Cursor::VerticalText => CursorIcon::VerticalText,
            Cursor::Alias => CursorIcon::Alias,
            Cursor::Copy => CursorIcon::Copy,
            Cursor::Move => CursorIcon::Move,
            Cursor::NoDrop => CursorIcon::NoDrop,
            Cursor::NotAllowed => CursorIcon::NotAllowed,
            Cursor::Grab => CursorIcon::Grab,
            Cursor::Grabbing => CursorIcon::Grabbing,
            Cursor::EResize => CursorIcon::EResize,
            Cursor::NResize => CursorIcon::NResize,
            Cursor::NeResize => CursorIcon::NeResize,
            Cursor::NwResize => CursorIcon::NwResize,
            Cursor::SResize => CursorIcon::SResize,
            Cursor::SeResize => CursorIcon::SeResize,
            Cursor::SwResize => CursorIcon::SwResize,
            Cursor::WResize => CursorIcon::WResize,
            Cursor::EwResize => CursorIcon::EwResize,
            Cursor::NsResize => CursorIcon::NsResize,
            Cursor::NeswResize => CursorIcon::NeswResize,
            Cursor::NwseResize => CursorIcon::NwseResize,
            Cursor::ColResize => CursorIcon::ColResize,
            Cursor::RowResize => CursorIcon::RowResize,
            Cursor::AllScroll => CursorIcon::AllScroll,
            Cursor::ZoomIn => CursorIcon::ZoomIn,
            Cursor::ZoomOut => CursorIcon::ZoomOut,
            Cursor::None => {
                self.winit_window.set_cursor_visible(false);
                return;
            },
        };
        self.winit_window.set_cursor(winit_cursor);
        self.winit_window.set_cursor_visible(true);
    }

    fn id(&self) -> ServoShellWindowId {
        let id: u64 = self.winit_window.id().into();
        id.into()
    }

    #[cfg(feature = "webxr")]
    fn new_glwindow(&self, event_loop: &ActiveEventLoop) -> Rc<dyn servo::webxr::GlWindow> {
        let size = self.winit_window.outer_size();

        let window_attr = winit::window::Window::default_attributes()
            .with_title("Servo XR".to_string())
            .with_inner_size(size)
            .with_visible(false);

        let winit_window = event_loop
            .create_window(window_attr)
            .expect("Failed to create window.");

        let pose = Rc::new(XRWindowPose {
            xr_rotation: Cell::new(Rotation3D::identity()),
            xr_translation: Cell::new(Vector3D::zero()),
        });
        self.xr_window_poses.borrow_mut().push(pose.clone());
        Rc::new(XRWindow { winit_window, pose })
    }

    fn rendering_context(&self) -> Rc<dyn RenderingContext> {
        self.rendering_context.clone()
    }

    fn theme(&self) -> servo::Theme {
        match self.winit_window.theme() {
            Some(winit::window::Theme::Dark) => servo::Theme::Dark,
            Some(winit::window::Theme::Light) | None => servo::Theme::Light,
        }
    }

    fn maximize(&self, _webview: &WebView) {
        self.winit_window.set_maximized(true);
    }

    /// Handle servoshell key bindings that may have been prevented by the page in the active webview.
    fn notify_input_event_handled(
        &self,
        webview: &WebView,
        id: InputEventId,
        result: InputEventResult,
    ) {
        let Some(keyboard_event) = self.pending_keyboard_events.borrow_mut().remove(&id) else {
            return;
        };
        if result.intersects(InputEventResult::DefaultPrevented | InputEventResult::Consumed) {
            return;
        }

        ShortcutMatcher::from_event(keyboard_event.event)
            .shortcut(CMD_OR_CONTROL, '=', || {
                webview.set_page_zoom(webview.page_zoom() + 0.1);
            })
            .shortcut(CMD_OR_CONTROL, '+', || {
                webview.set_page_zoom(webview.page_zoom() + 0.1);
            })
            .shortcut(CMD_OR_CONTROL, '-', || {
                webview.set_page_zoom(webview.page_zoom() - 0.1);
            })
            .shortcut(CMD_OR_CONTROL, '0', || {
                webview.set_page_zoom(1.0);
            })
            .shortcut(CMD_OR_CONTROL, 'R', || webview.reload())
            .shortcut(Modifiers::empty(), Key::Named(NamedKey::F5), || {
                webview.reload()
            });
    }

    fn focus(&self) {
        self.winit_window.focus_window();
    }

    fn has_platform_focus(&self) -> bool {
        self.winit_window.has_focus()
    }

    fn show_embedder_control(&self, webview_id: WebViewId, embedder_control: EmbedderControl) {
        let control_id = embedder_control.id();
        match embedder_control {
            EmbedderControl::SelectElement(prompt) => {
                // FIXME: Reading the toolbar height is needed here to properly position the select dialog.
                // But if the toolbar height changes while the dialog is open then the position won't be updated
                let offset = self.gui.borrow().toolbar_height();
                self.add_dialog(
                    webview_id,
                    Dialog::new_select_element_dialog(prompt, offset),
                );
            },
            EmbedderControl::ColorPicker(color_picker) => {
                // FIXME: Reading the toolbar height is needed here to properly position the select dialog.
                // But if the toolbar height changes while the dialog is open then the position won't be updated
                let offset = self.gui.borrow().toolbar_height();
                self.add_dialog(
                    webview_id,
                    Dialog::new_color_picker_dialog(color_picker, offset),
                );
            },
            EmbedderControl::InputMethod(input_method_control) => {
                self.show_ime(control_id, input_method_control);
            },
            EmbedderControl::FilePicker(file_picker) => {
                self.add_dialog(webview_id, Dialog::new_file_dialog(file_picker));
            },
            EmbedderControl::SimpleDialog(simple_dialog) => {
                self.add_dialog(webview_id, Dialog::new_simple_dialog(simple_dialog));
            },
            EmbedderControl::ContextMenu(prompt) => {
                let offset = self.gui.borrow().toolbar_height();
                self.add_dialog(webview_id, Dialog::new_context_menu(prompt, offset));
            },
        }
    }

    fn hide_embedder_control(&self, webview_id: WebViewId, embedder_control_id: EmbedderControlId) {
        if self.visible_input_method.get() == Some(embedder_control_id) {
            self.visible_input_method.set(None);
            self.winit_window.set_ime_allowed(false);
            return;
        }
        self.remove_dialog(webview_id, embedder_control_id);
    }

    fn show_bluetooth_device_dialog(
        &self,
        webview_id: WebViewId,
        request: BluetoothDeviceSelectionRequest,
    ) {
        self.add_dialog(webview_id, Dialog::new_device_selection_dialog(request));
    }

    fn show_permission_dialog(&self, webview_id: WebViewId, permission_request: PermissionRequest) {
        self.add_dialog(
            webview_id,
            Dialog::new_permission_request_dialog(permission_request),
        );
    }

    fn show_http_authentication_dialog(
        &self,
        webview_id: WebViewId,
        authentication_request: AuthenticationRequest,
    ) {
        self.add_dialog(
            webview_id,
            Dialog::new_authentication_dialog(authentication_request),
        );
    }

    fn dismiss_embedder_controls_for_webview(&self, webview_id: WebViewId) {
        self.dialogs.borrow_mut().remove(&webview_id);
    }

    fn show_console_message(&self, level: servo::ConsoleLogLevel, message: &str) {
        println!("{message}");
        log::log!(level.into(), "{message}");
    }

    fn notify_accessibility_tree_update(
        &self,
        _webview: WebView,
        tree_update: accesskit::TreeUpdate,
    ) {
        self.gui
            .borrow_mut()
            .notify_accessibility_tree_update(tree_update);
    }
}

fn winit_phase_to_touch_event_type(phase: TouchPhase) -> TouchEventType {
    match phase {
        TouchPhase::Started => TouchEventType::Down,
        TouchPhase::Moved => TouchEventType::Move,
        TouchPhase::Ended => TouchEventType::Up,
        TouchPhase::Cancelled => TouchEventType::Cancel,
    }
}

#[cfg(any(target_os = "linux", target_os = "windows"))]
fn load_icon(icon_bytes: &[u8]) -> Icon {
    let (icon_rgba, icon_width, icon_height) = {
        use image::{GenericImageView, Pixel};
        let image = image::load_from_memory(icon_bytes).expect("Failed to load icon");
        let (width, height) = image.dimensions();
        let mut rgba = Vec::with_capacity((width * height) as usize * 4);
        for (_, _, pixel) in image.pixels() {
            rgba.extend_from_slice(&pixel.to_rgba().0);
        }
        (rgba, width, height)
    };
    Icon::from_rgba(icon_rgba, icon_width, icon_height).expect("Failed to load icon")
}

#[cfg(feature = "webxr")]
struct XRWindow {
    winit_window: winit::window::Window,
    pose: Rc<XRWindowPose>,
}

struct XRWindowPose {
    xr_rotation: Cell<Rotation3D<f32, UnknownUnit, UnknownUnit>>,
    xr_translation: Cell<Vector3D<f32, UnknownUnit>>,
}

#[cfg(feature = "webxr")]
impl servo::webxr::GlWindow for XRWindow {
    fn get_render_target(
        &self,
        device: &mut surfman::Device,
        _context: &mut surfman::Context,
    ) -> servo::webxr::GlWindowRenderTarget {
        self.winit_window.set_visible(true);
        let window_handle = self
            .winit_window
            .window_handle()
            .expect("could not get window handle from window");
        let size = self.winit_window.inner_size();
        let size = Size2D::new(size.width as i32, size.height as i32);
        let native_widget = device
            .connection()
            .create_native_widget_from_window_handle(window_handle, size)
            .expect("Failed to create native widget");
        servo::webxr::GlWindowRenderTarget::NativeWidget(native_widget)
    }

    fn get_rotation(&self) -> Rotation3D<f32, UnknownUnit, UnknownUnit> {
        self.pose.xr_rotation.get()
    }

    fn get_translation(&self) -> Vector3D<f32, UnknownUnit> {
        self.pose.xr_translation.get()
    }

    fn get_mode(&self) -> servo::webxr::GlWindowMode {
        use servo::pref;
        if pref!(dom_webxr_glwindow_red_cyan) {
            servo::webxr::GlWindowMode::StereoRedCyan
        } else if pref!(dom_webxr_glwindow_left_right) {
            servo::webxr::GlWindowMode::StereoLeftRight
        } else if pref!(dom_webxr_glwindow_spherical) {
            servo::webxr::GlWindowMode::Spherical
        } else if pref!(dom_webxr_glwindow_cubemap) {
            servo::webxr::GlWindowMode::Cubemap
        } else {
            servo::webxr::GlWindowMode::Blit
        }
    }

    fn display_handle(&self) -> raw_window_handle::DisplayHandle<'_> {
        self.winit_window
            .display_handle()
            .expect("Every window should have a display handle")
    }
}

impl XRWindowPose {
    fn handle_xr_translation(&self, input: &KeyboardEvent) {
        if input.event.state != KeyState::Down {
            return;
        }
        const NORMAL_TRANSLATE: f32 = 0.1;
        const QUICK_TRANSLATE: f32 = 1.0;
        let mut x = 0.0;
        let mut z = 0.0;
        match input.event.key {
            Key::Character(ref k) => match &**k {
                "w" => z = -NORMAL_TRANSLATE,
                "W" => z = -QUICK_TRANSLATE,
                "s" => z = NORMAL_TRANSLATE,
                "S" => z = QUICK_TRANSLATE,
                "a" => x = -NORMAL_TRANSLATE,
                "A" => x = -QUICK_TRANSLATE,
                "d" => x = NORMAL_TRANSLATE,
                "D" => x = QUICK_TRANSLATE,
                _ => return,
            },
            _ => return,
        };
        let (old_x, old_y, old_z) = self.xr_translation.get().to_tuple();
        let vec = Vector3D::new(x + old_x, old_y, z + old_z);
        self.xr_translation.set(vec);
    }

    fn handle_xr_rotation(&self, input: &KeyEvent, modifiers: ModifiersState) {
        if input.state != ElementState::Pressed {
            return;
        }
        let mut x = 0.0;
        let mut y = 0.0;
        match input.logical_key {
            LogicalKey::Named(WinitNamedKey::ArrowUp) => x = 1.0,
            LogicalKey::Named(WinitNamedKey::ArrowDown) => x = -1.0,
            LogicalKey::Named(WinitNamedKey::ArrowLeft) => y = 1.0,
            LogicalKey::Named(WinitNamedKey::ArrowRight) => y = -1.0,
            _ => return,
        };
        if modifiers.shift_key() {
            x *= 10.0;
            y *= 10.0;
        }
        let x: Rotation3D<_, UnknownUnit, UnknownUnit> = Rotation3D::around_x(Angle::degrees(x));
        let y: Rotation3D<_, UnknownUnit, UnknownUnit> = Rotation3D::around_y(Angle::degrees(y));
        let rotation = self.xr_rotation.get().then(&x).then(&y);
        self.xr_rotation.set(rotation);
    }
}

#[derive(Default)]
pub struct TouchEventSimulator {
    pub left_mouse_button_down: Cell<bool>,
}

impl TouchEventSimulator {
    fn maybe_consume_move_button_event(
        &self,
        webview: &WebView,
        button: MouseButton,
        action: ElementState,
        point: DevicePoint,
    ) -> bool {
        if button != MouseButton::Left {
            return false;
        }

        if action == ElementState::Pressed && !self.left_mouse_button_down.get() {
            webview.notify_input_event(InputEvent::Touch(TouchEvent::new(
                TouchEventType::Down,
                TouchId(0),
                point.into(),
            )));
            self.left_mouse_button_down.set(true);
        } else if action == ElementState::Released {
            webview.notify_input_event(InputEvent::Touch(TouchEvent::new(
                TouchEventType::Up,
                TouchId(0),
                point.into(),
            )));
            self.left_mouse_button_down.set(false);
        }

        true
    }

    fn maybe_consume_mouse_move_event(
        &self,
        webview: &WebView,
        point: Point2D<f32, DevicePixel>,
    ) -> bool {
        if !self.left_mouse_button_down.get() {
            return false;
        }

        webview.notify_input_event(InputEvent::Touch(TouchEvent::new(
            TouchEventType::Move,
            TouchId(0),
            point.into(),
        )));
        true
    }
}