tdf#119856 related: opening kde5 filepicker from extensions now possible

certain things have to be done exclusively in main thread

Change-Id: Ib9f5a3187080cd986977e323a38a1e6c2ed57366
Reviewed-on: https://gerrit.libreoffice.org/62281Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>
Tested-by: Katarina Behrens <Katarina.Behrens@cib.de>

vcl/CustomTarget_kde5_moc.mk

@@ -10,6 +10,7 @@
 $(eval $(call gb_CustomTarget_CustomTarget,vcl/unx/kde5))
 
 $(call gb_CustomTarget_get_target,vcl/unx/kde5) : \
+	$(call gb_CustomTarget_get_workdir,vcl/unx/kde5)/KDE5SalInstance.moc \
 	$(call gb_CustomTarget_get_workdir,vcl/unx/kde5)/KDE5FilePicker.moc \
 	$(call gb_CustomTarget_get_workdir,vcl/unx/kde5)/tst_exclude_socket_notifiers.moc \
 	$(call gb_CustomTarget_get_workdir,vcl/unx/kde5)/tst_exclude_posted_events.moc

vcl/unx/kde5/KDE5FilePicker.hxx

@@ -168,6 +168,7 @@ protected:
     bool eventFilter(QObject* watched, QEvent* event) override;
 
 Q_SIGNALS:
+    sal_Int16 executeSignal();
     void setTitleSignal(const OUString& rTitle);
     void setDefaultNameSignal(const OUString& rName);
     void setDisplayDirectorySignal(const OUString& rDir);

vcl/unx/kde5/KDE5FilePicker2.cxx

@@ -106,6 +106,7 @@ KDE5FilePicker::KDE5FilePicker(QFileDialog::FileMode eMode)
 
     connect(_dialog, &QFileDialog::filterSelected, this, &KDE5FilePicker::filterChanged);
     connect(_dialog, &QFileDialog::fileSelected, this, &KDE5FilePicker::selectionChanged);
+    connect(this, &KDE5FilePicker::executeSignal, this, &KDE5FilePicker::execute);
 
     // XExecutableDialog
     connect(this, &KDE5FilePicker::setTitleSignal, this, &KDE5FilePicker::setTitleSlot,
@@ -183,6 +184,11 @@ void SAL_CALL KDE5FilePicker::setTitle(const OUString& title)
 
 sal_Int16 SAL_CALL KDE5FilePicker::execute()
 {
+    if (qApp->thread() != QThread::currentThread())
+    {
+        return Q_EMIT executeSignal();
+    }
+
     if (!_filters.isEmpty())
         _dialog->setNameFilters(_filters);
     if (!_currentFilter.isEmpty())

vcl/unx/kde5/KDE5SalInstance.cxx

@@ -46,6 +46,8 @@ KDE5SalInstance::KDE5SalInstance()
     pSVData->maAppData.mxToolkitName = OUString("kde5");
 
     KDE5SalData::initNWF();
+    connect(this, &KDE5SalInstance::createFilePickerSignal, this,
+            &KDE5SalInstance::createFilePicker, Qt::BlockingQueuedConnection);
 }
 
 SalFrame* KDE5SalInstance::CreateFrame(SalFrame* pParent, SalFrameStyleFlags nState)
@@ -54,8 +56,13 @@ SalFrame* KDE5SalInstance::CreateFrame(SalFrame* pParent, SalFrameStyleFlags nSt
 }
 
 uno::Reference<ui::dialogs::XFilePicker2>
-KDE5SalInstance::createFilePicker(const uno::Reference<uno::XComponentContext>& /*xMSF*/)
+KDE5SalInstance::createFilePicker(const uno::Reference<uno::XComponentContext>& xMSF)
 {
+    if (!IsMainThread())
+    {
+        return Q_EMIT createFilePickerSignal(xMSF);
+    }
+
     return uno::Reference<ui::dialogs::XFilePicker2>(new KDE5FilePicker(QFileDialog::ExistingFile));
 }
 
@@ -148,4 +155,5 @@ VCLPLUG_KDE5_PUBLIC SalInstance* create_SalInstance()
 }
 }
 
+#include <KDE5SalInstance.moc>
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

vcl/unx/kde5/KDE5SalInstance.hxx

@@ -20,9 +20,9 @@
 #pragma once
 
 #include <sal/config.h>
-
 #include <memory>
 
+#include <QtCore/QObject>
 #include <qt5/Qt5Instance.hxx>
 #include "KDE5SalFrame.hxx"
 
@@ -31,19 +31,25 @@ class SalFrame;
 
 class KDE5SalInstance : public Qt5Instance
 {
+    Q_OBJECT
 public:
     explicit KDE5SalInstance();
     virtual SalFrame* CreateFrame(SalFrame* pParent, SalFrameStyleFlags nStyle) override;
 
     virtual bool hasNativeFileSelection() const override { return true; }
 
-    virtual css::uno::Reference<css::ui::dialogs::XFilePicker2>
-    createFilePicker(const css::uno::Reference<css::uno::XComponentContext>&) override;
-
     virtual css::uno::Reference<css::ui::dialogs::XFolderPicker2>
     createFolderPicker(const css::uno::Reference<css::uno::XComponentContext>&) override;
 
     virtual bool IsMainThread() const override;
+
+Q_SIGNALS:
+    css::uno::Reference<css::ui::dialogs::XFilePicker2>
+    createFilePickerSignal(const css::uno::Reference<css::uno::XComponentContext>&);
+
+private Q_SLOTS:
+    virtual css::uno::Reference<css::ui::dialogs::XFilePicker2>
+    createFilePicker(const css::uno::Reference<css::uno::XComponentContext>&) override;
 };
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */