tdf#117175 wayland: Make popup windows not show off-screen

Depends on the gtk-3-24 dev branch, for the public
gdk_window_move_to_rect symbol.

Change-Id: Ic7a34ceb3d133ecac2addac54cf5f635eea332ed
Reviewed-on: https://gerrit.libreoffice.org/55612Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Maxim Monastirsky <momonasmon@gmail.com>

vcl/inc/salframe.hxx

@@ -159,6 +159,7 @@ public:
     SAL_WARN_UNUSED_RESULT
     virtual bool            GetWindowState( SalFrameState* pState ) = 0;
     virtual void            ShowFullScreen( bool bFullScreen, sal_Int32 nDisplay ) = 0;
+    virtual void            PositionByToolkit( const tools::Rectangle&, FloatWinPopupFlags ) {};
 
     // Enable/Disable ScreenSaver, SystemAgents, ...
     virtual void            StartPresentation( bool bStart ) = 0;

vcl/inc/unx/gtk/gtkframe.hxx

@@ -210,7 +210,10 @@ class GtkSalFrame : public SalFrame
 
 #if GTK_CHECK_VERSION(3,0,0)
     OUString                        m_aTooltip;
-    tools::Rectangle                       m_aHelpArea;
+    tools::Rectangle                m_aHelpArea;
+    tools::Rectangle                m_aFloatRect;
+    FloatWinPopupFlags              m_nFloatFlags;
+    bool                            m_bFloatPositioned;
     long                            m_nWidthRequest;
     long                            m_nHeightRequest;
     cairo_region_t*                 m_pRegion;
@@ -532,6 +535,7 @@ public:
     virtual void                EndSetClipRegion() override;
 
 #if GTK_CHECK_VERSION(3,0,0)
+    virtual void                PositionByToolkit(const tools::Rectangle& rRect, FloatWinPopupFlags nFlags) override;
     virtual void                SetModal(bool bModal) override;
     virtual bool                ShowTooltip(const OUString& rHelpText, const tools::Rectangle& rHelpArea) override;
     virtual void*               ShowPopover(const OUString& rHelpText, const tools::Rectangle& rHelpArea, QuickHelpFlags nFlags) override;

vcl/source/window/floatwin.cxx

@@ -741,6 +741,7 @@ void FloatingWindow::StartPopupMode( const tools::Rectangle& rRect, FloatWinPopu
     DoInitialLayout();
     mpImplData->maPos = ImplCalcPos(this, rRect, nFlags, nArrangeIndex, &mpImplData->maLOKTwipsPos);
     SetPosPixel( mpImplData->maPos );
+    ImplGetFrame()->PositionByToolkit(rRect, nFlags);
 
     // set data and display window
     // convert maFloatRect to absolute device coordinates

vcl/unx/gtk3/gtk3gtkframe.cxx

@@ -1130,6 +1130,9 @@ void GtkSalFrame::InitCommon()
     m_bGraphics = false;
     m_pGraphics = nullptr;
 
+    m_nFloatFlags = FloatWinPopupFlags::NONE;
+    m_bFloatPositioned = false;
+
     m_nWidthRequest = 0;
     m_nHeightRequest = 0;
 
@@ -2447,6 +2450,16 @@ void GtkSalFrame::EndSetClipRegion()
         gdk_window_shape_combine_region( widget_get_window(m_pWindow), m_pRegion, 0, 0 );
 }
 
+void GtkSalFrame::PositionByToolkit(const tools::Rectangle& rRect, FloatWinPopupFlags nFlags)
+{
+    if (ImplGetSVData()->maNWFData.mbCanDetermineWindowPosition)
+        return;
+
+    m_aFloatRect = rRect;
+    m_nFloatFlags = nFlags;
+    m_bFloatPositioned = true;
+}
+
 void GtkSalFrame::SetModal(bool bModal)
 {
     if (!m_pWindow)
@@ -2993,6 +3006,24 @@ void GtkSalFrame::sizeAllocated(GtkWidget* pWidget, GdkRectangle *pAllocation, g
         pThis->TriggerPaintEvent();
 }
 
+#if GTK_CHECK_VERSION(3,23,0)
+namespace {
+
+void swapDirection(GdkGravity& gravity)
+{
+    if (gravity == GDK_GRAVITY_NORTH_WEST)
+        gravity = GDK_GRAVITY_NORTH_EAST;
+    else if (gravity == GDK_GRAVITY_NORTH_EAST)
+        gravity = GDK_GRAVITY_NORTH_WEST;
+    else if (gravity == GDK_GRAVITY_SOUTH_WEST)
+        gravity = GDK_GRAVITY_SOUTH_EAST;
+    else if (gravity == GDK_GRAVITY_SOUTH_EAST)
+        gravity = GDK_GRAVITY_SOUTH_WEST;
+}
+
+}
+#endif
+
 void GtkSalFrame::signalRealize(GtkWidget*, gpointer frame)
 {
     GtkSalFrame* pThis = static_cast<GtkSalFrame*>(frame);
@@ -3000,6 +3031,49 @@ void GtkSalFrame::signalRealize(GtkWidget*, gpointer frame)
     if (pThis->m_bSalObjectSetPosSize)
         return;
     pThis->TriggerPaintEvent();
+
+#if GTK_CHECK_VERSION(3,23,0)
+    if (gtk_check_version(3, 23, 0) == nullptr && pThis->m_bFloatPositioned)
+    {
+        GdkGravity rect_anchor = GDK_GRAVITY_SOUTH_WEST, menu_anchor = GDK_GRAVITY_NORTH_WEST;
+
+        if (pThis->m_nFloatFlags & FloatWinPopupFlags::Left)
+        {
+            rect_anchor = GDK_GRAVITY_NORTH_WEST;
+            menu_anchor = GDK_GRAVITY_NORTH_EAST;
+        }
+        else if (pThis->m_nFloatFlags & FloatWinPopupFlags::Up)
+        {
+            rect_anchor = GDK_GRAVITY_NORTH_WEST;
+            menu_anchor = GDK_GRAVITY_SOUTH_WEST;
+        }
+        else if (pThis->m_nFloatFlags & FloatWinPopupFlags::Right)
+        {
+            rect_anchor = GDK_GRAVITY_NORTH_EAST;
+        }
+
+        GdkRectangle rect {static_cast<int>(pThis->m_aFloatRect.Left()),
+                           static_cast<int>(pThis->m_aFloatRect.Top()),
+                           static_cast<int>(pThis->m_aFloatRect.GetWidth()),
+                           static_cast<int>(pThis->m_aFloatRect.GetHeight())};
+
+        if (AllSettings::GetLayoutRTL())
+        {
+            rect.x = pThis->m_pParent->maGeometry.nWidth-rect.width-1-rect.x;
+            swapDirection(rect_anchor);
+            swapDirection(menu_anchor);
+        }
+
+        if (gdk_window_get_window_type(widget_get_window(pThis->m_pParent->m_pWindow)) == GDK_WINDOW_TOPLEVEL)
+        {
+            rect.x += pThis->m_pParent->maGeometry.nX;
+            rect.y += pThis->m_pParent->maGeometry.nY;
+        }
+
+        GdkWindow* gdkWindow = widget_get_window(pThis->m_pWindow);
+        gdk_window_move_to_rect(gdkWindow, &rect, rect_anchor, menu_anchor, GDK_ANCHOR_FLIP, 0, 0);
+    }
+#endif
 }
 
 gboolean GtkSalFrame::signalConfigure(GtkWidget*, GdkEventConfigure* pEvent, gpointer frame)
@@ -3109,6 +3183,15 @@ gboolean GtkSalFrame::signalUnmap( GtkWidget*, GdkEvent*, gpointer frame )
 
     pThis->CallCallbackExc( SalEvent::Resize, nullptr );
 
+    if (pThis->m_bFloatPositioned)
+    {
+        // Unrealize is needed for cases where we reuse the same popup
+        // (e.g. the font name control), making the realize signal fire
+        // again on next show.
+        gtk_widget_unrealize(pThis->m_pWindow);
+        pThis->m_bFloatPositioned = false;
+    }
+
     return false;
 }