interface ICoreWebView2AcceleratorKeyPressedEventArgs2

Artículo
10/21/2024

interface ICoreWebView2AcceleratorKeyPressedEventArgs2
  : public ICoreWebView2AcceleratorKeyPressedEventArgs

This is a continuation of the ICoreWebView2AcceleratorKeyPressedEventArgs interface.

Summary

Members	Descriptions
get_IsBrowserAcceleratorKeyEnabled	Gets the `IsBrowserAcceleratorKeyEnabled` property.
put_IsBrowserAcceleratorKeyEnabled	This property allows developers to enable or disable the browser from handling a specific browser accelerator key such as Ctrl+P or F3, etc.

Applies to

Product	Introduced
WebView2 Win32	1.0.2210.55
WebView2 Win32 Prerelease	1.0.2357

Members

get_IsBrowserAcceleratorKeyEnabled

Gets the IsBrowserAcceleratorKeyEnabled property.

public HRESULT get_IsBrowserAcceleratorKeyEnabled(BOOL * value)

put_IsBrowserAcceleratorKeyEnabled

This property allows developers to enable or disable the browser from handling a specific browser accelerator key such as Ctrl+P or F3, etc.

public HRESULT put_IsBrowserAcceleratorKeyEnabled(BOOL value)

Browser accelerator keys are the keys/key combinations that access features specific to a web browser, including but not limited to:

Ctrl-F and F3 for Find on Page
Ctrl-P for Print
Ctrl-R and F5 for Reload
Ctrl-Plus and Ctrl-Minus for zooming
Ctrl-Shift-C and F12 for DevTools
Special keys for browser functions, such as Back, Forward, and Search

This property does not disable accelerator keys related to movement and text editing, such as:

Home, End, Page Up, and Page Down
Ctrl-X, Ctrl-C, Ctrl-V
Ctrl-A for Select All
Ctrl-Z for Undo

The CoreWebView2Settings.AreBrowserAcceleratorKeysEnabled API is a convenient setting for developers to disable all the browser accelerator keys together, and sets the default value for the IsBrowserAcceleratorKeyEnabled property. By default, CoreWebView2Settings.AreBrowserAcceleratorKeysEnabled is TRUE and IsBrowserAcceleratorKeyEnabled is TRUE. When developers change CoreWebView2Settings.AreBrowserAcceleratorKeysEnabled setting to FALSE, this will change default value for IsBrowserAcceleratorKeyEnabled to FALSE. If developers want specific keys to be handled by the browser after changing the CoreWebView2Settings.AreBrowserAcceleratorKeysEnabled setting to FALSE, they need to enable these keys by setting IsBrowserAcceleratorKeyEnabled to TRUE. This API will give the event arg higher priority over the CoreWebView2Settings.AreBrowserAcceleratorKeysEnabled setting when we handle the keys.

For browser accelerator keys, when an accelerator key is pressed, the propagation and processing order is:

A CoreWebView2Controller.AcceleratorKeyPressed event is raised
WebView2 browser feature accelerator key handling
Web Content Handling: If the key combination isn't reserved for browser actions, the key event propagates to the web content, where JavaScript event listeners can capture and respond to it.

ICoreWebView2AcceleratorKeyPressedEventArgs has a Handled property, that developers can use to mark a key as handled. When the key is marked as handled anywhere along the path, the event propagation stops, and web content will not receive the key. With IsBrowserAcceleratorKeyEnabled property, if developers mark IsBrowserAcceleratorKeyEnabled as FALSE, the browser will skip the WebView2 browser feature accelerator key handling process, but the event propagation continues, and web content will receive the key combination.

    if (m_settings3)
    {
        // Register a handler for the AcceleratorKeyPressed event.
        CHECK_FAILURE(m_controller->add_AcceleratorKeyPressed(
            Callback<ICoreWebView2AcceleratorKeyPressedEventHandler>(
                [this](
                    ICoreWebView2Controller* sender,
                    ICoreWebView2AcceleratorKeyPressedEventArgs* args) -> HRESULT
                {
                    COREWEBVIEW2_KEY_EVENT_KIND kind;
                    CHECK_FAILURE(args->get_KeyEventKind(&kind));
                    // We only care about key down events.
                    if (kind == COREWEBVIEW2_KEY_EVENT_KIND_KEY_DOWN ||
                        kind == COREWEBVIEW2_KEY_EVENT_KIND_SYSTEM_KEY_DOWN)
                    {
                        UINT key;
                        CHECK_FAILURE(args->get_VirtualKey(&key));

                        wil::com_ptr<ICoreWebView2AcceleratorKeyPressedEventArgs2> args2;

                        args->QueryInterface(IID_PPV_ARGS(&args2));
                        if (args2)
                        {
                            if (key == 'P' && (GetKeyState(VK_CONTROL) < 0))
                            {
                                // tell the browser to skip the key
                                CHECK_FAILURE(args2->put_IsBrowserAcceleratorKeyEnabled(FALSE));
                            }
                            if (key == VK_F7)
                            {
                                // tell the browser to process the key
                                CHECK_FAILURE(args2->put_IsBrowserAcceleratorKeyEnabled(TRUE));
                            }
                        }
                    }
                    return S_OK;
                })
                .Get(),
            &m_acceleratorKeyPressedToken));
    }