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authorMike Kaganski <mike.kaganski@collabora.com>2018-11-05 18:23:40 +0300
committerMike Kaganski <mike.kaganski@collabora.com>2018-11-05 19:30:16 +0100
commita30dbe34a14906933cfd47e29a4df69a628ab517 (patch)
treea4bbb20ffa1db24a7d85f4a0b1b98f8416387ec0 /dtrans/source
parent994cf675adac2e9afb48b49b38a36658b3115204 (diff)
Win: implement Clipboard Format Listener instead of obsolete Viewer
https://docs.microsoft.com/en-us/windows/desktop/dataxchg/using-the-clipboard discusses the techniques to monitor clipboard contents on Windows, and recommends Clipboard Format Listener for Vista+. https://docs.microsoft.com/en-us/windows/desktop/api/winuser/nf-winuser-setclipboardviewer further mentions that using the current "Clipboard Viewer Window" approach, "The clipboard viewer chain can be broken by an application that fails to handle the clipboard chain messages properly". This change reimplements our listener to use recommended way; this should make our clipboard handling more robust, avoiding the need to handle the chain with other applications' windows. Change-Id: Ib33b27a57d7a6af2ab7e3e59d030aa55329694f9 Reviewed-on: https://gerrit.libreoffice.org/62909 Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com> Tested-by: Mike Kaganski <mike.kaganski@collabora.com>
Diffstat (limited to 'dtrans/source')
-rw-r--r--dtrans/source/win32/clipb/MtaOleClipb.cxx65
-rw-r--r--dtrans/source/win32/clipb/MtaOleClipb.hxx6
2 files changed, 10 insertions, 61 deletions
diff --git a/dtrans/source/win32/clipb/MtaOleClipb.cxx b/dtrans/source/win32/clipb/MtaOleClipb.cxx
index 79983edd5b16..d935713b8e43 100644
--- a/dtrans/source/win32/clipb/MtaOleClipb.cxx
+++ b/dtrans/source/win32/clipb/MtaOleClipb.cxx
@@ -161,7 +161,6 @@ CMtaOleClipboard::CMtaOleClipboard( ) :
m_hEvtThrdReady( nullptr ),
m_hwndMtaOleReqWnd( nullptr ),
m_MtaOleReqWndClassAtom( 0 ),
- m_hwndNextClipViewer( nullptr ),
m_pfncClipViewerCallback( nullptr ),
m_bRunClipboardNotifierThread( true ),
m_hClipboardChangedEvent( m_hClipboardChangedNotifierEvents[0] ),
@@ -238,8 +237,7 @@ CMtaOleClipboard::~CMtaOleClipboard( )
if ( m_MtaOleReqWndClassAtom )
UnregisterClassW( g_szWndClsName, nullptr );
- OSL_ENSURE( ( nullptr == m_pfncClipViewerCallback ) &&
- !IsWindow( m_hwndNextClipViewer ),
+ OSL_ENSURE( ( nullptr == m_pfncClipViewerCallback ),
"Clipboard viewer not properly unregistered" );
}
@@ -354,7 +352,7 @@ bool CMtaOleClipboard::registerClipViewer( LPFNC_CLIPVIEWER_CALLBACK_t pfncClipV
bool CMtaOleClipboard::onRegisterClipViewer( LPFNC_CLIPVIEWER_CALLBACK_t pfncClipViewerCallback )
{
- bool bRet = true;
+ bool bRet = false;
// we need exclusive access because the clipboard changed notifier
// thread also accesses this variable
@@ -366,13 +364,9 @@ bool CMtaOleClipboard::onRegisterClipViewer( LPFNC_CLIPVIEWER_CALLBACK_t pfncCli
// SetClipboardViewer sends a WM_DRAWCLIPBOARD message we ignore
// this message if we register ourself as clip viewer
m_bInRegisterClipViewer = true;
- m_hwndNextClipViewer = SetClipboardViewer( m_hwndMtaOleReqWnd );
+ bRet = AddClipboardFormatListener(m_hwndMtaOleReqWnd);
m_bInRegisterClipViewer = false;
- // if there is no other cb-viewer the
- // return value is NULL!!!
- bRet = IsWindow( m_hwndNextClipViewer );
-
// save the new callback function
m_pfncClipViewerCallback = pfncClipViewerCallback;
}
@@ -382,8 +376,7 @@ bool CMtaOleClipboard::onRegisterClipViewer( LPFNC_CLIPVIEWER_CALLBACK_t pfncCli
// unregister if input parameter is NULL and we previously registered
// as clipboard viewer
- ChangeClipboardChain( m_hwndMtaOleReqWnd, m_hwndNextClipViewer );
- m_hwndNextClipViewer = nullptr;
+ bRet = RemoveClipboardFormatListener(m_hwndMtaOleReqWnd);
}
return bRet;
@@ -417,32 +410,9 @@ LRESULT CMtaOleClipboard::onFlushClipboard( )
return static_cast<LRESULT>( OleFlushClipboard( ) );
}
-// handle clipboard chain change event
+// handle clipboard update event
-LRESULT CMtaOleClipboard::onChangeCBChain( HWND hWndRemove, HWND hWndNext )
-{
- if ( hWndRemove == m_hwndNextClipViewer )
- m_hwndNextClipViewer = hWndNext;
- else if ( IsWindow( m_hwndNextClipViewer ) )
- {
- // forward the message to the next one
- DWORD_PTR dwpResult;
- SendMessageTimeoutW(
- m_hwndNextClipViewer,
- WM_CHANGECBCHAIN,
- reinterpret_cast<WPARAM>(hWndRemove),
- reinterpret_cast<LPARAM>(hWndNext),
- SMTO_BLOCK,
- MAX_CLIPEVENT_PROCESSING_TIME,
- &dwpResult );
- }
-
- return 0;
-}
-
-// handle draw clipboard event
-
-LRESULT CMtaOleClipboard::onDrawClipboard( )
+LRESULT CMtaOleClipboard::onClipboardUpdate()
{
// we don't send a notification if we are
// registering ourself as clipboard
@@ -456,20 +426,6 @@ LRESULT CMtaOleClipboard::onDrawClipboard( )
aGuard.clear( );
}
- // forward the message to the next viewer in the chain
- if ( IsWindow( m_hwndNextClipViewer ) )
- {
- DWORD_PTR dwpResult;
- SendMessageTimeoutW(
- m_hwndNextClipViewer,
- WM_DRAWCLIPBOARD,
- static_cast< WPARAM >( 0 ),
- static_cast< LPARAM >( 0 ),
- SMTO_BLOCK,
- MAX_CLIPEVENT_PROCESSING_TIME,
- &dwpResult );
- }
-
return 0;
}
@@ -543,13 +499,8 @@ LRESULT CALLBACK CMtaOleClipboard::mtaOleReqWndProc( HWND hWnd, UINT uMsg, WPARA
reinterpret_cast<CMtaOleClipboard::LPFNC_CLIPVIEWER_CALLBACK_t>(wParam));
break;
- case WM_CHANGECBCHAIN:
- lResult = pImpl->onChangeCBChain(
- reinterpret_cast< HWND >( wParam ), reinterpret_cast< HWND >( lParam ) );
- break;
-
- case WM_DRAWCLIPBOARD:
- lResult = pImpl->onDrawClipboard( );
+ case WM_CLIPBOARDUPDATE:
+ lResult = pImpl->onClipboardUpdate();
break;
case MSG_SHUTDOWN:
diff --git a/dtrans/source/win32/clipb/MtaOleClipb.hxx b/dtrans/source/win32/clipb/MtaOleClipb.hxx
index abab29bf9717..fdd00088dbe8 100644
--- a/dtrans/source/win32/clipb/MtaOleClipb.hxx
+++ b/dtrans/source/win32/clipb/MtaOleClipb.hxx
@@ -72,9 +72,8 @@ private:
static LRESULT onFlushClipboard( );
bool onRegisterClipViewer( LPFNC_CLIPVIEWER_CALLBACK_t pfncClipViewerCallback );
- // win32 clipboard-viewer support
- LRESULT onChangeCBChain( HWND hWndRemove, HWND hWndNext );
- LRESULT onDrawClipboard( );
+ // win32 clipboard listener support
+ LRESULT onClipboardUpdate();
static LRESULT CALLBACK mtaOleReqWndProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam );
static unsigned int WINAPI oleThreadProc( LPVOID pParam );
@@ -89,7 +88,6 @@ private:
HANDLE m_hEvtThrdReady;
HWND m_hwndMtaOleReqWnd;
ATOM m_MtaOleReqWndClassAtom;
- HWND m_hwndNextClipViewer;
LPFNC_CLIPVIEWER_CALLBACK_t m_pfncClipViewerCallback;
bool m_bInRegisterClipViewer;