LOK: add Document::setClientVisibleArea()

... and implement it in Writer.

Otherwise there is no way we can perform e.g. page down in an expected
way. Without this, the core visible area depends on the zoom in the
document, and the client visible area can be something entirely
different.

Change-Id: Iadfb5a225da09a2551ffa41ddf503bb3d22b3eae

desktop/source/lib/init.cxx

@@ -350,6 +350,7 @@ static void doc_setClientZoom(LibreOfficeKitDocument* pThis,
                                     int nTilePixelHeight,
                                     int nTileTwipWidth,
                                     int nTileTwipHeight);
+static void doc_setClientVisibleArea(LibreOfficeKitDocument* pThis, int nX, int nY, int nWidth, int nHeight);
 static int doc_createView(LibreOfficeKitDocument* pThis);
 static void doc_destroyView(LibreOfficeKitDocument* pThis, int nId);
 static void doc_setView(LibreOfficeKitDocument* pThis, int nId);
@@ -396,6 +397,7 @@ LibLODocument_Impl::LibLODocument_Impl(const uno::Reference <css::lang::XCompone
         m_pDocumentClass->resetSelection = doc_resetSelection;
         m_pDocumentClass->getCommandValues = doc_getCommandValues;
         m_pDocumentClass->setClientZoom = doc_setClientZoom;
+        m_pDocumentClass->setClientVisibleArea = doc_setClientVisibleArea;
 
         m_pDocumentClass->createView = doc_createView;
         m_pDocumentClass->destroyView = doc_destroyView;
@@ -1496,6 +1498,19 @@ static void doc_setClientZoom(LibreOfficeKitDocument* pThis, int nTilePixelWidth
     pDoc->setClientZoom(nTilePixelWidth, nTilePixelHeight, nTileTwipWidth, nTileTwipHeight);
 }
 
+static void doc_setClientVisibleArea(LibreOfficeKitDocument* pThis, int nX, int nY, int nWidth, int nHeight)
+{
+    ITiledRenderable* pDoc = getTiledRenderable(pThis);
+    if (!pDoc)
+    {
+        gImpl->maLastExceptionMsg = "Document doesn't support tiled rendering";
+        return;
+    }
+
+    Rectangle aRectangle(Point(nX, nY), Size(nWidth, nHeight));
+    pDoc->setClientVisibleArea(aRectangle);
+}
+
 static int doc_createView(LibreOfficeKitDocument* /*pThis*/)
 {
     SolarMutexGuard aGuard;

include/LibreOfficeKit/LibreOfficeKit.h

@@ -205,6 +205,8 @@ struct _LibreOfficeKitDocumentClass
             int nTilePixelHeight,
             int nTileTwipWidth,
             int nTileTwipHeight);
+    /// @see lok::Document::setVisibleArea).
+    void (*setClientVisibleArea) (LibreOfficeKitDocument* pThis, int nX, int nY, int nWidth, int nHeight);
 
     /// @see lok::Document::createView().
     int (*createView) (LibreOfficeKitDocument* pThis);

include/LibreOfficeKit/LibreOfficeKit.hxx

@@ -332,6 +332,21 @@ public:
         mpDoc->pClass->setClientZoom(mpDoc, nTilePixelWidth, nTilePixelHeight, nTileTwipWidth, nTileTwipHeight);
     }
 
+    /**
+     * Inform core about the currently visible area of the document on the
+     * client, so that it can perform e.g. page down (which depends on the
+     * visible height) in a sane way.
+     *
+     * @param nX - top left corner horizontal position
+     * @param nY - top left corner vertical position
+     * @param nWidth - area width
+     * @param nHeight - area height
+     */
+    inline void setClientVisibleArea(int nX, int nY, int nWidth, int nHeight)
+    {
+        mpDoc->pClass->setClientVisibleArea(mpDoc, nX, nY, nWidth, nHeight);
+    }
+
     /**
      * Create a new view for an existing document.
      * By default a loaded document has 1 view.

include/vcl/ITiledRenderable.hxx

@@ -202,6 +202,11 @@ public:
         (void) nTileTwipWidth;
         (void) nTileTwipHeight;
     }
+
+    /// @see lok::Document::setClientVisibleArea().
+    virtual void setClientVisibleArea(const Rectangle& /*rRectangle*/)
+    {
+    }
 };
 
 } // namespace vcl

libreofficekit/source/gtk/lokdocview.cxx

@@ -569,7 +569,15 @@ postKeyEventInThread(gpointer data)
     }
     if (priv->m_bVisibleAreaSet)
     {
-        // TODO invoke lok::Document::setVisibleArea() here.
+        std::stringstream ss;
+        ss << "lok::Document::setClientVisibleArea(" << priv->m_aVisibleArea.x << ", " << priv->m_aVisibleArea.y << ", ";
+        ss << priv->m_aVisibleArea.width << ", " << priv->m_aVisibleArea.height << ")";
+        g_info("%s", ss.str().c_str());
+        priv->m_pDocument->pClass->setClientVisibleArea(priv->m_pDocument,
+                                                        priv->m_aVisibleArea.x,
+                                                        priv->m_aVisibleArea.y,
+                                                        priv->m_aVisibleArea.width,
+                                                        priv->m_aVisibleArea.height);
         priv->m_bVisibleAreaSet = false;
     }
 

sw/inc/unotxdoc.hxx

@@ -434,6 +434,8 @@ public:
     virtual void setClipboard(const css::uno::Reference<css::datatransfer::clipboard::XClipboard>& xClipboard) override;
     /// @see vcl::ITiledRenderable::isMimeTypeSupported().
     virtual bool isMimeTypeSupported() override;
+    /// @see vcl::ITiledRenderable::setClientVisibleArea().
+    virtual void setClientVisibleArea(const Rectangle& rRectangle);
     /// @see vcl::ITiledRenderable::getPointer().
     virtual Pointer getPointer() override;
 

sw/source/uibase/uno/unotxdoc.cxx

@@ -3180,6 +3180,15 @@ bool SwXTextDocument::isMimeTypeSupported()
     return aDataHelper.GetXTransferable().is() && SwTransferable::IsPaste(*pWrtShell, aDataHelper);
 }
 
+void SwXTextDocument::setClientVisibleArea(const Rectangle& rRectangle)
+{
+    SwView* pView = pDocShell->GetView();
+    if (!pView)
+        return;
+
+    pView->SetVisArea(rRectangle);
+}
+
 Pointer SwXTextDocument::getPointer()
 {
     SolarMutexGuard aGuard;