editeng, svx: introduce ability to clip vertical text overflow

Introduces editeng text property TextClipVerticalOverflow.

Which when set causes vertical text that is overflown out of a
frame/shape truncated. (Only when text isn't being edited)

This is implemented as two steps:
(if text overflows)
1 - Vertical adjust is forced to top.
(Forcing vert adjust to top isn't the desired behavior normally,
but good enough for a first cut I'd say.)
-> The desired behavior would be after the overflown text is
truncated, doing a vertical adjust (of center/bottom/top) on
that piece of text.

2 - ClipRange is set to the height of the frame/shape.

This appears to work with different text directions too (vertical
etc.).

Change-Id: I697715a7d28bde94a6650609b16505ffab92173f
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/150106
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>

2 files changed, 10 insertions, 5 deletions

diff --git a/svx/source/svdraw/svdattr.cxx b/svx/source/svdraw/svdattr.cxx
index 3503fae4f6ce..5af9956fc45d 100644
--- a/svx/source/svdraw/svdattr.cxx
+++ b/svx/source/svdraw/svdattr.cxx
@@ -171,6 +171,7 @@ SdrItemPool::SdrItemPool(
     rPoolDefaults[SDRATTR_TEXT_CHAINNEXTNAME    -SDRATTR_START]=new SfxStringItem(SDRATTR_TEXT_CHAINNEXTNAME, "");
     rPoolDefaults[SDRATTR_TEXT_USEFIXEDCELLHEIGHT -SDRATTR_START]=new SdrTextFixedCellHeightItem;
     rPoolDefaults[SDRATTR_TEXT_WORDWRAP         -SDRATTR_START]=new SdrOnOffItem(SDRATTR_TEXT_WORDWRAP, true);
+    rPoolDefaults[SDRATTR_TEXT_CLIPVERTOVERFLOW-SDRATTR_START]=new SdrOnOffItem(SDRATTR_TEXT_CLIPVERTOVERFLOW, false);
     rPoolDefaults[SDRATTR_EDGEKIND         -SDRATTR_START]=new SdrEdgeKindItem;
     rPoolDefaults[SDRATTR_EDGENODE1HORZDIST-SDRATTR_START]=new SdrEdgeNode1HorzDistItem(nDefEdgeDist);
     rPoolDefaults[SDRATTR_EDGENODE1VERTDIST-SDRATTR_START]=new SdrEdgeNode1VertDistItem(nDefEdgeDist);
diff --git a/svx/source/svdraw/svdotextdecomposition.cxx b/svx/source/svdraw/svdotextdecomposition.cxx
index ddbc6bfe540a..138b709e9769 100644
--- a/svx/source/svdraw/svdotextdecomposition.cxx
+++ b/svx/source/svdraw/svdotextdecomposition.cxx
@@ -1103,19 +1103,21 @@ void SdrTextObj::impDecomposeBlockTextPrimitive(
         }
     }
 
+    const double fFreeVerticalSpace(aAnchorTextRange.getHeight() - aOutlinerScale.getY());
+    bool bClipVerticalTextOverflow = fFreeVerticalSpace < 0
+                                     && GetObjectItemSet().Get(SDRATTR_TEXT_CLIPVERTOVERFLOW).GetValue();
     // correct vertical translation using the now known text size
-    if(SDRTEXTVERTADJUST_CENTER == eVAdj || SDRTEXTVERTADJUST_BOTTOM == eVAdj)
+    if((SDRTEXTVERTADJUST_CENTER == eVAdj || SDRTEXTVERTADJUST_BOTTOM == eVAdj)
+       && !bClipVerticalTextOverflow)
     {
-        const double fFree(aAnchorTextRange.getHeight() - aOutlinerScale.getY());
-
         if(SDRTEXTVERTADJUST_CENTER == eVAdj)
         {
-            aAdjustTranslate.setY(fFree / 2.0);
+            aAdjustTranslate.setY(fFreeVerticalSpace / 2.0);
         }
 
         if(SDRTEXTVERTADJUST_BOTTOM == eVAdj)
         {
-            aAdjustTranslate.setY(fFree);
+            aAdjustTranslate.setY(fFreeVerticalSpace);
         }
     }
 
@@ -1159,6 +1161,8 @@ void SdrTextObj::impDecomposeBlockTextPrimitive(
 
     // create ClipRange (if needed)
     basegfx::B2DRange aClipRange;
+    if(bClipVerticalTextOverflow)
+        aClipRange = {0, 0, std::numeric_limits<double>::max(), aAnchorTextRange.getHeight()};
 
     // now break up text primitives.
     impTextBreakupHandler aConverter(rOutliner);