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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using Windows.Win32.System.Ole;
using static Interop.Mshtml;
using ComTypes = System.Runtime.InteropServices.ComTypes;
using MsHtml = Windows.Win32.Web.MsHtml;
using Ole = Windows.Win32.System.Ole;
namespace System.Windows.Forms;
public partial class WebBrowser
{
/// <summary>
/// Provides a default WebBrowserSite implementation for use in the CreateWebBrowserSite
/// method in the WebBrowser class.
/// </summary>
protected class WebBrowserSite : WebBrowserSiteBase, IDocHostUIHandler
{
/// <summary>
/// Creates an instance of the <see cref="WebBrowserSite"/> class.
/// </summary>
public WebBrowserSite(WebBrowser host)
: base(host)
{
}
// IDocHostUIHandler Implementation
unsafe HRESULT IDocHostUIHandler.ShowContextMenu(uint dwID, Point* pt, object pcmdtReserved, object pdispReserved)
{
WebBrowser wb = (WebBrowser)Host;
if (wb.IsWebBrowserContextMenuEnabled)
{
// let MSHTML display its UI
return HRESULT.S_FALSE;
}
if (pt is null)
{
return HRESULT.E_INVALIDARG;
}
if (pt->X == 0 && pt->Y == 0)
{
// IDocHostUIHandler::ShowContextMenu sends (0,0) when the context menu is invoked via the keyboard
// make it (-1, -1) for the WebBrowser::ShowContextMenu method
pt->X = -1;
pt->Y = -1;
}
wb.ShowContextMenu(*pt);
// MSHTML should not display its context menu because we displayed ours
return HRESULT.S_OK;
}
unsafe HRESULT IDocHostUIHandler.GetHostInfo(MsHtml.DOCHOSTUIINFO* pInfo)
{
if (pInfo is null)
{
return HRESULT.E_POINTER;
}
WebBrowser wb = (WebBrowser)Host;
pInfo->dwDoubleClick = MsHtml.DOCHOSTUIDBLCLK.DOCHOSTUIDBLCLK_DEFAULT;
pInfo->dwFlags = MsHtml.DOCHOSTUIFLAG.DOCHOSTUIFLAG_NO3DOUTERBORDER |
MsHtml.DOCHOSTUIFLAG.DOCHOSTUIFLAG_DISABLE_SCRIPT_INACTIVE;
if (wb.ScrollBarsEnabled)
{
pInfo->dwFlags |= MsHtml.DOCHOSTUIFLAG.DOCHOSTUIFLAG_FLAT_SCROLLBAR;
}
else
{
pInfo->dwFlags |= MsHtml.DOCHOSTUIFLAG.DOCHOSTUIFLAG_SCROLL_NO;
}
if (Application.RenderWithVisualStyles)
{
pInfo->dwFlags |= MsHtml.DOCHOSTUIFLAG.DOCHOSTUIFLAG_THEME;
}
else
{
pInfo->dwFlags |= MsHtml.DOCHOSTUIFLAG.DOCHOSTUIFLAG_NOTHEME;
}
return HRESULT.S_OK;
}
HRESULT IDocHostUIHandler.EnableModeless(BOOL fEnable)
{
return HRESULT.E_NOTIMPL;
}
HRESULT IDocHostUIHandler.ShowUI(
uint dwID,
IOleInPlaceActiveObject.Interface activeObject,
IOleCommandTarget.Interface commandTarget,
IOleInPlaceFrame.Interface frame,
IOleInPlaceUIWindow.Interface doc)
{
return HRESULT.S_FALSE;
}
HRESULT IDocHostUIHandler.HideUI()
{
return HRESULT.E_NOTIMPL;
}
HRESULT IDocHostUIHandler.UpdateUI()
{
return HRESULT.E_NOTIMPL;
}
HRESULT IDocHostUIHandler.OnDocWindowActivate(BOOL fActivate)
{
return HRESULT.E_NOTIMPL;
}
HRESULT IDocHostUIHandler.OnFrameWindowActivate(BOOL fActivate)
{
return HRESULT.E_NOTIMPL;
}
unsafe HRESULT IDocHostUIHandler.ResizeBorder(RECT* rect, IOleInPlaceUIWindow.Interface doc, BOOL fFrameWindow)
{
return HRESULT.E_NOTIMPL;
}
HRESULT IDocHostUIHandler.GetOptionKeyPath(string[] pbstrKey, uint dw)
{
return HRESULT.E_NOTIMPL;
}
HRESULT IDocHostUIHandler.GetDropTarget(Ole.IDropTarget.Interface pDropTarget, out Ole.IDropTarget.Interface? ppDropTarget)
{
// Set to null no matter what we return, to prevent the marshaller
// from having issues if the pointer points to random stuff.
ppDropTarget = null;
return HRESULT.E_NOTIMPL;
}
HRESULT IDocHostUIHandler.GetExternal(out object? ppDispatch)
{
WebBrowser wb = (WebBrowser)Host;
ppDispatch = wb.ObjectForScripting;
return HRESULT.S_OK;
}
unsafe HRESULT IDocHostUIHandler.TranslateAccelerator(MSG* lpMsg, Guid* pguidCmdGroup, uint nCmdID)
{
if (lpMsg is null || pguidCmdGroup is null)
{
return HRESULT.E_POINTER;
}
// Returning S_FALSE will allow the native control to do default processing,
// i.e., execute the shortcut key. Returning S_OK will cancel the shortcut key.
WebBrowser wb = (WebBrowser)Host;
if (!wb.WebBrowserShortcutsEnabled)
{
int keyCode = (int)(uint)lpMsg->wParam | (int)ModifierKeys;
if (lpMsg->message != PInvokeCore.WM_CHAR && Enum.IsDefined((Shortcut)keyCode))
{
return HRESULT.S_OK;
}
}
return HRESULT.S_FALSE;
}
HRESULT IDocHostUIHandler.TranslateUrl(uint dwTranslate, string strUrlIn, out string? pstrUrlOut)
{
// Set to null no matter what we return, to prevent the marshaller
// from having issues if the pointer points to random stuff.
pstrUrlOut = null;
return HRESULT.S_FALSE;
}
HRESULT IDocHostUIHandler.FilterDataObject(ComTypes.IDataObject pDO, out ComTypes.IDataObject? ppDORet)
{
// Set to null no matter what we return, to prevent the marshaller
// from having issues if the pointer points to random stuff.
ppDORet = null;
return HRESULT.S_FALSE;
}
internal override void OnPropertyChanged(int dispid)
{
if (dispid != PInvokeCore.DISPID_READYSTATE)
{
base.OnPropertyChanged(dispid);
}
}
}
}
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