interface ICoreWebView2Controller4

Article
05/02/2022

Note

This reference is no longer being maintained. For the latest API reference, see WebView2 API Reference.

interface ICoreWebView2Controller4
  : public ICoreWebView2Controller3

This is the ICoreWebView2Controller4 interface.

Summary

Members	Descriptions
get_AllowExternalDrop	Gets the `AllowExternalDrop` property which is used to configure the capability that dragging objects from outside the bounds of webview2 and dropping into webview2 is allowed or disallowed.
put_AllowExternalDrop	Sets the `AllowExternalDrop` property which is used to configure the capability that dragging objects from outside the bounds of webview2 and dropping into webview2 is allowed or disallowed.

The ICoreWebView2Controller4 provides interface to enable/disable external drop.

Applies to

Product	Introduced
WebView2 Win32	1.0.1185.39
WebView2 Win32 Prerelease	1.0.1189

Members

get_AllowExternalDrop

Gets the AllowExternalDrop property which is used to configure the capability that dragging objects from outside the bounds of webview2 and dropping into webview2 is allowed or disallowed.

public HRESULT get_AllowExternalDrop(BOOL * value)

The default value is TRUE.

            wil::com_ptr<ICoreWebView2Controller> controller =
                m_appWindow->GetWebViewController();
            wil::com_ptr<ICoreWebView2Controller4> controller4 =
                controller.try_query<ICoreWebView2Controller4>();
            if (controller4)
            {
                BOOL allowExternalDrop;
                CHECK_FAILURE(controller4->get_AllowExternalDrop(&allowExternalDrop));
                if (allowExternalDrop)
                {
                    CHECK_FAILURE(controller4->put_AllowExternalDrop(FALSE));
                    MessageBox(
                        nullptr, L"WebView disallows dropping files now.",
                        L"WebView AllowExternalDrop property changed", MB_OK);
                }
                else
                {
                    CHECK_FAILURE(controller4->put_AllowExternalDrop(TRUE));
                    MessageBox(
                        nullptr, L"WebView allows dropping files now.",
                        L"WebView AllowExternalDrop property changed", MB_OK);
                }
            }

put_AllowExternalDrop

Sets the AllowExternalDrop property which is used to configure the capability that dragging objects from outside the bounds of webview2 and dropping into webview2 is allowed or disallowed.

public HRESULT put_AllowExternalDrop(BOOL value)

            wil::com_ptr<ICoreWebView2Controller> controller =
                m_appWindow->GetWebViewController();
            wil::com_ptr<ICoreWebView2Controller4> controller4 =
                controller.try_query<ICoreWebView2Controller4>();
            if (controller4)
            {
                BOOL allowExternalDrop;
                CHECK_FAILURE(controller4->get_AllowExternalDrop(&allowExternalDrop));
                if (allowExternalDrop)
                {
                    CHECK_FAILURE(controller4->put_AllowExternalDrop(FALSE));
                    MessageBox(
                        nullptr, L"WebView disallows dropping files now.",
                        L"WebView AllowExternalDrop property changed", MB_OK);
                }
                else
                {
                    CHECK_FAILURE(controller4->put_AllowExternalDrop(TRUE));
                    MessageBox(
                        nullptr, L"WebView allows dropping files now.",
                        L"WebView AllowExternalDrop property changed", MB_OK);
                }
            }

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