Resolves: #i124216# Detect changes of the UI scale.

(cherry picked from commit 7e5783030c82f8ec87b88899869e9152cf5c3271)

Conflicts:
	svx/source/sidebar/possize/PosSizePropertyPanel.hxx

Change-Id: Ia31d5645694ca9b9ebb36f38c650103905b346a8

2 files changed, 35 insertions, 0 deletions

diff --git a/svx/source/sidebar/possize/PosSizePropertyPanel.cxx b/svx/source/sidebar/possize/PosSizePropertyPanel.cxx
index 291d71b4964d..f320e3e88156 100644
--- a/svx/source/sidebar/possize/PosSizePropertyPanel.cxx
+++ b/svx/source/sidebar/possize/PosSizePropertyPanel.cxx
@@ -811,6 +811,7 @@ void PosSizePropertyPanel::NotifyItemUpdate(
 
         case SID_ATTR_METRIC:
             MetricState( eState, pState );
+            UpdateUIScale();
             break;
 
         default:
@@ -1162,4 +1163,26 @@ void PosSizePropertyPanel::DisableControls()
 }
 
 
+
+
+void PosSizePropertyPanel::UpdateUIScale()
+{
+    const Fraction aUIScale (mpView->GetModel()->GetUIScale());
+    if (maUIScale != aUIScale)
+    {
+        // UI scale has changed.
+
+        // Remember the new UI scale.
+        maUIScale = aUIScale;
+
+        // The content of the position and size boxes is only updated when item changes are notified.
+        // Request such notifications without changing the actual item values.
+        GetBindings()->Invalidate(SID_ATTR_TRANSFORM_POS_X, sal_True, sal_False);
+        GetBindings()->Invalidate(SID_ATTR_TRANSFORM_POS_Y, sal_True, sal_False);
+        GetBindings()->Invalidate(SID_ATTR_TRANSFORM_WIDTH, sal_True, sal_False);
+        GetBindings()->Invalidate(SID_ATTR_TRANSFORM_HEIGHT, sal_True, sal_False);
+    }
+}
+
+
 } } // end of namespace svx::sidebar
diff --git a/svx/source/sidebar/possize/PosSizePropertyPanel.hxx b/svx/source/sidebar/possize/PosSizePropertyPanel.hxx
index f7892827f3d1..5649a490e4c0 100644
--- a/svx/source/sidebar/possize/PosSizePropertyPanel.hxx
+++ b/svx/source/sidebar/possize/PosSizePropertyPanel.hxx
@@ -173,6 +173,18 @@ private:
     void MetricState( SfxItemState eState, const SfxPoolItem* pState );
     FieldUnit GetCurrentUnit( SfxItemState eState, const SfxPoolItem* pState );
     void DisableControls();
+
+    /** Check if the UI scale has changed and handle such a change.
+        UI scale is an SD only feature.  The UI scale is represented by items
+        ATTR_OPTIONS_SCALE_X and
+        ATTR_OPTIONS_SCALE_Y.
+        As we have no direct access (there is no dependency of svx on sd) we have to
+        use a small trick (aka hack):
+        a) call this method whenever a change of the metric item is notified,
+        b) check if the UI scale has changed (strangely, the UI scale value is available at the SdrModel.
+        c) invalidate the items for position and size to trigger notifications of their current values.
+    */
+    void UpdateUIScale();
 };