Basic structures for qt5 drag'n'drop support

put (so far) no-op UNO ifaces in place

Change-Id: I95394cfe05b8e3db21ddce6dfed1c1bb1d0e6381
Reviewed-on: https://gerrit.libreoffice.org/61385
Tested-by: Jenkins
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>

7 files changed, 351 insertions, 0 deletions

diff --git a/vcl/Library_vclplug_qt5.mk b/vcl/Library_vclplug_qt5.mk
index a57fd53ddf24..c835b748696b 100644
--- a/vcl/Library_vclplug_qt5.mk
+++ b/vcl/Library_vclplug_qt5.mk
@@ -87,6 +87,7 @@ $(eval $(call gb_Library_add_exception_objects,vclplug_qt5,\
     vcl/qt5/Qt5Bitmap \
     vcl/qt5/Qt5Clipboard \
     vcl/qt5/Qt5Data \
+    vcl/qt5/Qt5DragAndDrop \
     vcl/qt5/Qt5FilePicker \
     vcl/qt5/Qt5Font \
     vcl/qt5/Qt5FontFace \
diff --git a/vcl/inc/qt5/Qt5DragAndDrop.hxx b/vcl/inc/qt5/Qt5DragAndDrop.hxx
new file mode 100644
index 000000000000..733cf4d03570
--- /dev/null
+++ b/vcl/inc/qt5/Qt5DragAndDrop.hxx
@@ -0,0 +1,107 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * 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 http://mozilla.org/MPL/2.0/.
+ *
+ */
+
+#pragma once
+
+#include <cppuhelper/compbase.hxx>
+
+#include <com/sun/star/datatransfer/dnd/XDragSource.hpp>
+#include <com/sun/star/datatransfer/dnd/XDropTarget.hpp>
+#include <com/sun/star/lang/XInitialization.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+
+class Qt5Frame;
+
+class Qt5DragSource
+    : public cppu::WeakComponentImplHelper<css::datatransfer::dnd::XDragSource,
+                                           css::lang::XInitialization, css::lang::XServiceInfo>
+{
+    osl::Mutex m_aMutex;
+    Qt5Frame* m_pFrame;
+    css::uno::Reference<css::datatransfer::dnd::XDragSourceListener> m_xListener;
+    css::uno::Reference<css::datatransfer::XTransferable> m_xTrans;
+
+public:
+    Qt5DragSource()
+        : WeakComponentImplHelper(m_aMutex)
+        , m_pFrame(nullptr)
+    {
+    }
+
+    virtual ~Qt5DragSource() override;
+
+    // XDragSource
+    virtual sal_Bool SAL_CALL isDragImageSupported() override;
+    virtual sal_Int32 SAL_CALL getDefaultCursor(sal_Int8 dragAction) override;
+    virtual void SAL_CALL startDrag(
+        const css::datatransfer::dnd::DragGestureEvent& trigger, sal_Int8 sourceActions,
+        sal_Int32 cursor, sal_Int32 image,
+        const css::uno::Reference<css::datatransfer::XTransferable>& transferable,
+        const css::uno::Reference<css::datatransfer::dnd::XDragSourceListener>& listener) override;
+
+    // XInitialization
+    virtual void SAL_CALL initialize(const css::uno::Sequence<css::uno::Any>& rArguments) override;
+    void deinitialize();
+
+    OUString SAL_CALL getImplementationName() override;
+
+    sal_Bool SAL_CALL supportsService(OUString const& ServiceName) override;
+
+    css::uno::Sequence<OUString> SAL_CALL getSupportedServiceNames() override;
+
+    void dragFailed();
+};
+
+class Qt5DropTarget
+    : public cppu::WeakComponentImplHelper<css::datatransfer::dnd::XDropTarget,
+                                           css::datatransfer::dnd::XDropTargetDragContext,
+                                           css::datatransfer::dnd::XDropTargetDropContext,
+                                           css::lang::XInitialization, css::lang::XServiceInfo>
+{
+    osl::Mutex m_aMutex;
+    Qt5Frame* m_pFrame;
+    bool m_bActive;
+    sal_Int8 m_nDefaultActions;
+    std::vector<css::uno::Reference<css::datatransfer::dnd::XDropTargetListener>> m_aListeners;
+
+public:
+    Qt5DropTarget();
+    virtual ~Qt5DropTarget() override;
+
+    // XInitialization
+    virtual void SAL_CALL initialize(const css::uno::Sequence<css::uno::Any>& rArgs) override;
+    void deinitialize();
+
+    // XDropTarget
+    virtual void SAL_CALL addDropTargetListener(
+        const css::uno::Reference<css::datatransfer::dnd::XDropTargetListener>&) override;
+    virtual void SAL_CALL removeDropTargetListener(
+        const css::uno::Reference<css::datatransfer::dnd::XDropTargetListener>&) override;
+    virtual sal_Bool SAL_CALL isActive() override;
+    virtual void SAL_CALL setActive(sal_Bool active) override;
+    virtual sal_Int8 SAL_CALL getDefaultActions() override;
+    virtual void SAL_CALL setDefaultActions(sal_Int8 actions) override;
+
+    // XDropTargetDragContext
+    virtual void SAL_CALL acceptDrag(sal_Int8 dragOperation) override;
+    virtual void SAL_CALL rejectDrag() override;
+
+    // XDropTargetDropContext
+    virtual void SAL_CALL acceptDrop(sal_Int8 dropOperation) override;
+    virtual void SAL_CALL rejectDrop() override;
+    virtual void SAL_CALL dropComplete(sal_Bool success) override;
+
+    // XServiceInfo
+    OUString SAL_CALL getImplementationName() override;
+    sal_Bool SAL_CALL supportsService(OUString const& ServiceName) override;
+    css::uno::Sequence<OUString> SAL_CALL getSupportedServiceNames() override;
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/qt5/Qt5Frame.hxx b/vcl/inc/qt5/Qt5Frame.hxx
index 577a9cce2fde..ce468ded3c18 100644
--- a/vcl/inc/qt5/Qt5Frame.hxx
+++ b/vcl/inc/qt5/Qt5Frame.hxx
@@ -34,6 +34,8 @@ class Qt5Instance;
 class Qt5Menu;
 class QWidget;
 class Qt5MainWindow;
+class Qt5DragSource;
+class Qt5DropTarget;
 class QPaintDevice;
 class QScreen;
 class QImage;
@@ -68,6 +70,9 @@ class VCLPLUG_QT5_PUBLIC Qt5Frame : public QObject, public SalFrame
 
     Qt5Menu* m_pSalMenu;
 
+    Qt5DragSource* m_pDragSource;
+    Qt5DropTarget* m_pDropTarget;
+
     bool m_bDefaultSize;
     bool m_bDefaultPos;
 
@@ -121,6 +126,11 @@ public:
     virtual void SetMenu(SalMenu* pMenu) override;
     virtual void DrawMenuBar() override;
 
+    virtual void registerDragSource(Qt5DragSource* pDragSource);
+    virtual void deregisterDragSource(Qt5DragSource const* pDragSource);
+    virtual void registerDropTarget(Qt5DropTarget* pDropTarget);
+    virtual void deregisterDropTarget(Qt5DropTarget const* pDropTarget);
+
     virtual void SetExtendedFrameStyle(SalExtStyle nExtStyle) override;
     virtual void Show(bool bVisible, bool bNoActivate = false) override;
     virtual void SetMinClientSize(long nWidth, long nHeight) override;
diff --git a/vcl/inc/qt5/Qt5Instance.hxx b/vcl/inc/qt5/Qt5Instance.hxx
index 58ab6e329544..8f5a2670b238 100644
--- a/vcl/inc/qt5/Qt5Instance.hxx
+++ b/vcl/inc/qt5/Qt5Instance.hxx
@@ -112,6 +112,8 @@ public:
 
     virtual css::uno::Reference<css::uno::XInterface>
     CreateClipboard(const css::uno::Sequence<css::uno::Any>& i_rArguments) override;
+    virtual css::uno::Reference<css::uno::XInterface> CreateDragSource() override;
+    virtual css::uno::Reference<css::uno::XInterface> CreateDropTarget() override;
 };
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/qt5/Qt5DragAndDrop.cxx b/vcl/qt5/Qt5DragAndDrop.cxx
new file mode 100644
index 000000000000..6e83f6ff40fa
--- /dev/null
+++ b/vcl/qt5/Qt5DragAndDrop.cxx
@@ -0,0 +1,192 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * 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 http://mozilla.org/MPL/2.0/.
+ *
+ */
+
+#include <com/sun/star/awt/MouseButton.hpp>
+#include <com/sun/star/datatransfer/DataFlavor.hpp>
+#include <com/sun/star/datatransfer/dnd/DNDConstants.hpp>
+#include <cppuhelper/supportsservice.hxx>
+#include <sal/log.hxx>
+
+#include <Qt5DragAndDrop.hxx>
+#include <Qt5Frame.hxx>
+
+using namespace com::sun::star;
+using namespace com::sun::star::uno;
+using namespace com::sun::star::lang;
+
+Qt5DragSource::~Qt5DragSource()
+{
+    //if (m_pFrame)
+    //    m_pFrame->deregisterDragSource(this);
+}
+
+void Qt5DragSource::deinitialize() { m_pFrame = nullptr; }
+
+sal_Bool Qt5DragSource::isDragImageSupported() { return true; }
+
+sal_Int32 Qt5DragSource::getDefaultCursor(sal_Int8) { return 0; }
+
+void Qt5DragSource::initialize(const css::uno::Sequence<css::uno::Any>& rArguments)
+{
+    if (rArguments.getLength() < 2)
+    {
+        throw RuntimeException("DragSource::initialize: Cannot install window event handler",
+                               static_cast<OWeakObject*>(this));
+    }
+
+    sal_IntPtr nFrame = 0;
+    rArguments.getConstArray()[1] >>= nFrame;
+
+    if (!nFrame)
+    {
+        throw RuntimeException("DragSource::initialize: missing SalFrame",
+                               static_cast<OWeakObject*>(this));
+    }
+
+    m_pFrame = reinterpret_cast<Qt5Frame*>(nFrame);
+    m_pFrame->registerDragSource(this);
+}
+
+void Qt5DragSource::startDrag(
+    const datatransfer::dnd::DragGestureEvent& /*rEvent*/, sal_Int8 /*sourceActions*/,
+    sal_Int32 /*cursor*/, sal_Int32 /*image*/,
+    const css::uno::Reference<css::datatransfer::XTransferable>& rTrans,
+    const css::uno::Reference<css::datatransfer::dnd::XDragSourceListener>& rListener)
+{
+    m_xListener = rListener;
+    m_xTrans = rTrans;
+
+    if (!m_pFrame)
+        dragFailed();
+}
+
+void Qt5DragSource::dragFailed()
+{
+    if (m_xListener.is())
+    {
+        datatransfer::dnd::DragSourceDropEvent aEv;
+        aEv.DropAction = datatransfer::dnd::DNDConstants::ACTION_NONE;
+        aEv.DropSuccess = false;
+        auto xListener = m_xListener;
+        m_xListener.clear();
+        xListener->dragDropEnd(aEv);
+    }
+}
+
+OUString SAL_CALL Qt5DragSource::getImplementationName()
+{
+    return OUString("com.sun.star.datatransfer.dnd.VclQt5DragSource");
+}
+
+sal_Bool SAL_CALL Qt5DragSource::supportsService(OUString const& ServiceName)
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+css::uno::Sequence<OUString> SAL_CALL Qt5DragSource::getSupportedServiceNames()
+{
+    Sequence<OUString> aRet{ "com.sun.star.datatransfer.dnd.Qt5DragSource" };
+    return aRet;
+}
+
+Qt5DropTarget::Qt5DropTarget()
+    : WeakComponentImplHelper(m_aMutex)
+    , m_pFrame(nullptr)
+    , m_bActive(false)
+    , m_nDefaultActions(0)
+{
+}
+
+OUString SAL_CALL Qt5DropTarget::getImplementationName()
+{
+    return OUString("com.sun.star.datatransfer.dnd.VclQt5DropTarget");
+}
+
+sal_Bool SAL_CALL Qt5DropTarget::supportsService(OUString const& ServiceName)
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+css::uno::Sequence<OUString> SAL_CALL Qt5DropTarget::getSupportedServiceNames()
+{
+    Sequence<OUString> aRet{ "com.sun.star.datatransfer.dnd.Qt5DropTarget" };
+    return aRet;
+}
+
+Qt5DropTarget::~Qt5DropTarget()
+{
+    //if (m_pFrame)
+    //m_pFrame->deregisterDropTarget(this);
+}
+
+void Qt5DropTarget::deinitialize()
+{
+    m_pFrame = nullptr;
+    m_bActive = false;
+}
+
+void Qt5DropTarget::initialize(const Sequence<Any>& rArguments)
+{
+    if (rArguments.getLength() < 2)
+    {
+        throw RuntimeException("DropTarget::initialize: Cannot install window event handler",
+                               static_cast<OWeakObject*>(this));
+    }
+
+    sal_IntPtr nFrame = 0;
+    rArguments.getConstArray()[1] >>= nFrame;
+
+    if (!nFrame)
+    {
+        throw RuntimeException("DropTarget::initialize: missing SalFrame",
+                               static_cast<OWeakObject*>(this));
+    }
+
+    m_pFrame = reinterpret_cast<Qt5Frame*>(nFrame);
+    //m_pFrame->registerDropTarget(this);
+    m_bActive = true;
+}
+
+void Qt5DropTarget::addDropTargetListener(
+    const Reference<css::datatransfer::dnd::XDropTargetListener>& xListener)
+{
+    ::osl::Guard<::osl::Mutex> aGuard(m_aMutex);
+
+    m_aListeners.push_back(xListener);
+}
+
+void Qt5DropTarget::removeDropTargetListener(
+    const Reference<css::datatransfer::dnd::XDropTargetListener>& xListener)
+{
+    ::osl::Guard<::osl::Mutex> aGuard(m_aMutex);
+
+    m_aListeners.erase(std::remove(m_aListeners.begin(), m_aListeners.end(), xListener),
+                       m_aListeners.end());
+}
+
+sal_Bool Qt5DropTarget::isActive() { return m_bActive; }
+
+void Qt5DropTarget::setActive(sal_Bool bActive) { m_bActive = bActive; }
+
+sal_Int8 Qt5DropTarget::getDefaultActions() { return m_nDefaultActions; }
+
+void Qt5DropTarget::setDefaultActions(sal_Int8 nDefaultActions)
+{
+    m_nDefaultActions = nDefaultActions;
+}
+
+void Qt5DropTarget::acceptDrag(sal_Int8 /*dragOperation*/) { return; }
+void Qt5DropTarget::rejectDrag() { return; }
+
+void Qt5DropTarget::acceptDrop(sal_Int8 /*dropOperation*/) { return; }
+void Qt5DropTarget::rejectDrop() { return; }
+void Qt5DropTarget::dropComplete(sal_Bool /*success*/) { return; }
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/qt5/Qt5Frame.cxx b/vcl/qt5/Qt5Frame.cxx
index b42ec5e08a0c..070342601bbd 100644
--- a/vcl/qt5/Qt5Frame.cxx
+++ b/vcl/qt5/Qt5Frame.cxx
@@ -27,6 +27,7 @@
 #include <Qt5MainWindow.hxx>
 #include <Qt5Data.hxx>
 #include <Qt5Menu.hxx>
+#include <Qt5DragAndDrop.hxx>
 
 #include <QtCore/QPoint>
 #include <QtCore/QSize>
@@ -835,4 +836,31 @@ void Qt5Frame::SetApplicationID(const OUString&)
     // So the hope is that QGuiApplication deals with this properly..
 }
 
+// Drag'n'drop foo
+void Qt5Frame::registerDragSource(Qt5DragSource* pDragSource)
+{
+    assert(!m_pDragSource);
+    m_pDragSource = pDragSource;
+}
+
+void Qt5Frame::deregisterDragSource(Qt5DragSource const* pDragSource)
+{
+    assert(m_pDragSource == pDragSource);
+    (void)pDragSource;
+    m_pDragSource = nullptr;
+}
+
+void Qt5Frame::registerDropTarget(Qt5DropTarget* pDropTarget)
+{
+    assert(!m_pDropTarget);
+    m_pDropTarget = pDropTarget;
+}
+
+void Qt5Frame::deregisterDropTarget(Qt5DropTarget const* pDropTarget)
+{
+    assert(m_pDropTarget == pDropTarget);
+    (void)pDropTarget;
+    m_pDropTarget = nullptr;
+}
+
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/qt5/Qt5Instance.cxx b/vcl/qt5/Qt5Instance.cxx
index 71e9883416f1..f780860dccc5 100644
--- a/vcl/qt5/Qt5Instance.cxx
+++ b/vcl/qt5/Qt5Instance.cxx
@@ -25,6 +25,7 @@
 #include <Qt5Bitmap.hxx>
 #include <Qt5Clipboard.hxx>
 #include <Qt5Data.hxx>
+#include <Qt5DragAndDrop.hxx>
 #include <Qt5FilePicker.hxx>
 #include <Qt5Frame.hxx>
 #include <Qt5Menu.hxx>
@@ -241,6 +242,16 @@ Qt5Instance::CreateClipboard(const css::uno::Sequence<css::uno::Any>& arguments)
     return xClipboard;
 }
 
+Reference<XInterface> Qt5Instance::CreateDragSource()
+{
+    return Reference<XInterface>(static_cast<cppu::OWeakObject*>(new Qt5DragSource()));
+}
+
+Reference<XInterface> Qt5Instance::CreateDropTarget()
+{
+    return Reference<XInterface>(static_cast<cppu::OWeakObject*>(new Qt5DropTarget()));
+}
+
 extern "C" {
 VCLPLUG_QT5_PUBLIC SalInstance* create_SalInstance()
 {