Qt5 fix some broken RTL handling

For RTL decisions we always use Qt's own setting after setting it on
startup using QGuiApplication::setLayoutDirection. The only difference
between LO and Qt events is the mirrored cursor position, which needs
explicit mirroring before reporting mouse based events (mouse and
wheel). Tooltips and frame positioning will be handled in separate
patches.

Additionally the horizontal scroll bar direction hack based on the
scroll bar button positions, needs to handle RTL explicitly.

Change-Id: I5ce5e69113a6cb6a9cf37a449265c49d92a7c159
Reviewed-on: https://gerrit.libreoffice.org/74545
Tested-by: Jenkins
Reviewed-by: Jan-Marek Glogowski <glogow@fbihome.de>

3 files changed, 12 insertions, 4 deletions

diff --git a/vcl/qt5/Qt5Graphics_Controls.cxx b/vcl/qt5/Qt5Graphics_Controls.cxx
index 73a47e5e5ffa..32a2d132efc5 100644
--- a/vcl/qt5/Qt5Graphics_Controls.cxx
+++ b/vcl/qt5/Qt5Graphics_Controls.cxx
@@ -518,7 +518,11 @@ bool Qt5Graphics_Controls::drawNativeControl(ControlType type, ControlPart part,
             option.sliderPosition = sbVal->mnCur;
             option.pageStep = sbVal->mnVisibleSize;
             if (part == ControlPart::DrawBackgroundHorz)
-                option.upsideDown = sbVal->maButton1Rect.Left() > sbVal->maButton2Rect.Left();
+                option.upsideDown
+                    = (QGuiApplication::isRightToLeft()
+                       && sbVal->maButton1Rect.Left() < sbVal->maButton2Rect.Left())
+                      || (QGuiApplication::isLeftToRight()
+                          && sbVal->maButton1Rect.Left() > sbVal->maButton2Rect.Left());
 
             //setup the active control... always the slider
             if (sbVal->mnThumbState & ControlState::ROLLOVER)
diff --git a/vcl/qt5/Qt5Instance.cxx b/vcl/qt5/Qt5Instance.cxx
index 6c872b84cb0a..86c94ba792de 100644
--- a/vcl/qt5/Qt5Instance.cxx
+++ b/vcl/qt5/Qt5Instance.cxx
@@ -247,6 +247,8 @@ void Qt5Instance::AfterAppInit()
     // as this otherwise overrides the individual desktop icons on X11.
     if (QGuiApplication::platformName() == "wayland")
         QGuiApplication::setDesktopFileName(QStringLiteral("libreoffice-startcenter.desktop"));
+    QGuiApplication::setLayoutDirection(AllSettings::GetLayoutRTL() ? Qt::RightToLeft
+                                                                    : Qt::LeftToRight);
 }
 
 void Qt5Instance::deleteObjectLater(QObject* pObject) { pObject->deleteLater(); }
diff --git a/vcl/qt5/Qt5Widget.cxx b/vcl/qt5/Qt5Widget.cxx
index 657c5e8e73f7..dac72b0c764e 100644
--- a/vcl/qt5/Qt5Widget.cxx
+++ b/vcl/qt5/Qt5Widget.cxx
@@ -141,7 +141,9 @@ void Qt5Widget::handleMouseButtonEvent(const Qt5Frame& rFrame, QMouseEvent* pEve
     }
 
     aEvent.mnTime = pEvent->timestamp();
-    aEvent.mnX = static_cast<long>(pEvent->pos().x());
+    aEvent.mnX = static_cast<long>(QGuiApplication::isLeftToRight()
+                                       ? pEvent->pos().x()
+                                       : rFrame.GetQWidget()->width() - pEvent->pos().x());
     aEvent.mnY = static_cast<long>(pEvent->pos().y());
     aEvent.mnCode = GetKeyModCode(pEvent->modifiers()) | GetMouseModCode(pEvent->buttons());
 
@@ -166,7 +168,7 @@ void Qt5Widget::mouseMoveEvent(QMouseEvent* pEvent)
 
     SalMouseEvent aEvent;
     aEvent.mnTime = pEvent->timestamp();
-    aEvent.mnX = point.x();
+    aEvent.mnX = QGuiApplication::isLeftToRight() ? point.x() : width() - point.x();
     aEvent.mnY = point.y();
     aEvent.mnCode = GetKeyModCode(pEvent->modifiers()) | GetMouseModCode(pEvent->buttons());
     aEvent.mnButton = 0;
@@ -191,7 +193,7 @@ void Qt5Widget::wheelEvent(QWheelEvent* pEvent)
     aEvent.mbHorz = nDelta == 0;
     if (aEvent.mbHorz)
     {
-        nDelta = pEvent->angleDelta().x();
+        nDelta = (QGuiApplication::isLeftToRight() ? -1 : 1) * pEvent->angleDelta().x();
         if (!nDelta)
             return;