invalidate prerendered fontname cache on style change

Change-Id: Ie2111f23dc3346b914442090e3d9257c5659fafc
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/102459
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>

2 files changed, 40 insertions, 17 deletions

diff --git a/include/svtools/ctrlbox.hxx b/include/svtools/ctrlbox.hxx
index 7411976b1642..817e276665d4 100644
--- a/include/svtools/ctrlbox.hxx
+++ b/include/svtools/ctrlbox.hxx
@@ -30,10 +30,11 @@
 
 namespace weld { class CustomWeld; }
 
-class VirtualDevice;
 class BitmapEx;
 class BorderWidthImpl;
 class FontList;
+class VclSimpleEvent;
+class VirtualDevice;
 
 /** Utility class storing the border line width, style and colors. The widths
     are defined in Twips.
@@ -339,7 +340,8 @@ private:
     SVT_DLLPRIVATE void         ImplDestroyFontList();
 
     DECL_LINK(CustomRenderHdl, weld::ComboBox::render_args, void);
-    DECL_STATIC_LINK(FontNameBox, CustomGetSizeHdl, OutputDevice&, Size);
+    DECL_LINK(CustomGetSizeHdl, OutputDevice&, Size);
+    DECL_LINK(SettingsChangedHdl, VclSimpleEvent&, void);
     DECL_LINK(UpdateHdl, Timer*, void);
 
     void            LoadMRUEntries( const OUString& aFontMRUEntriesFile );
diff --git a/svtools/source/control/ctrlbox.cxx b/svtools/source/control/ctrlbox.cxx
index 8287418a4fe4..3c553f531556 100644
--- a/svtools/source/control/ctrlbox.cxx
+++ b/svtools/source/control/ctrlbox.cxx
@@ -336,6 +336,35 @@ static size_t gPreviewsPerDevice;
 static std::vector<VclPtr<VirtualDevice>> gFontPreviewVirDevs;
 static std::vector<OUString> gRenderedFontNames;
 
+namespace
+{
+    void calcCustomItemSize(weld::ComboBox& rComboBox)
+    {
+        gUserItemSz = Size(rComboBox.get_approximate_digit_width() * 52, rComboBox.get_text_height());
+        gUserItemSz.setHeight(gUserItemSz.Height() * 16);
+        gUserItemSz.setHeight(gUserItemSz.Height() / 10);
+
+        size_t nMaxDeviceHeight = SAL_MAX_INT16 / 2; // see limitXCreatePixmap
+        gPreviewsPerDevice = nMaxDeviceHeight / gUserItemSz.Height();
+    }
+}
+
+IMPL_LINK(FontNameBox, SettingsChangedHdl, VclSimpleEvent&, rEvent, void)
+{
+    if (rEvent.GetId() != VclEventId::ApplicationDataChanged)
+        return;
+
+    DataChangedEvent* pData = static_cast<DataChangedEvent*>(static_cast<VclWindowEvent&>(rEvent).GetData());
+    if (pData->GetType() == DataChangedEventType::SETTINGS)
+    {
+        gFontPreviewVirDevs.clear();
+        gRenderedFontNames.clear();
+        calcCustomItemSize(*m_xComboBox);
+        if (mbWYSIWYG)
+            maUpdateIdle.Start();
+    }
+}
+
 FontNameBox::FontNameBox(std::unique_ptr<weld::ComboBox> p)
     : m_xComboBox(std::move(p))
     , mnPreviewProgress(0)
@@ -347,10 +376,14 @@ FontNameBox::FontNameBox(std::unique_ptr<weld::ComboBox> p)
 
     maUpdateIdle.SetPriority(TaskPriority::LOWEST);
     maUpdateIdle.SetInvokeHandler(LINK(this, FontNameBox, UpdateHdl));
+
+    Application::AddEventListener(LINK(this, FontNameBox, SettingsChangedHdl));
 }
 
 FontNameBox::~FontNameBox()
 {
+    Application::RemoveEventListener(LINK(this, FontNameBox, SettingsChangedHdl));
+
     if (mpFontList)
     {
         SaveMRUEntries (maFontMRUEntriesFile);
@@ -473,21 +506,9 @@ void FontNameBox::EnableWYSIWYG(bool bEnable)
         return;
     mbWYSIWYG = bEnable;
 
-    static bool bGlobalsInited;
-    if (mbWYSIWYG && !bGlobalsInited)
-    {
-        gUserItemSz = Size(m_xComboBox->get_approximate_digit_width() * 52, m_xComboBox->get_text_height());
-        gUserItemSz.setHeight(gUserItemSz.Height() * 16);
-        gUserItemSz.setHeight(gUserItemSz.Height() / 10);
-
-        size_t nMaxDeviceHeight = SAL_MAX_INT16 / 2; // see limitXCreatePixmap
-        gPreviewsPerDevice = nMaxDeviceHeight / gUserItemSz.Height();
-
-        bGlobalsInited = true;
-    }
-
     if (mbWYSIWYG)
     {
+        calcCustomItemSize(*m_xComboBox);
         m_xComboBox->connect_custom_get_size(LINK(this, FontNameBox, CustomGetSizeHdl));
         m_xComboBox->connect_custom_render(LINK(this, FontNameBox, CustomRenderHdl));
     }
@@ -499,9 +520,9 @@ void FontNameBox::EnableWYSIWYG(bool bEnable)
     m_xComboBox->set_custom_renderer(mbWYSIWYG);
 }
 
-IMPL_STATIC_LINK_NOARG(FontNameBox, CustomGetSizeHdl, OutputDevice&, Size)
+IMPL_LINK_NOARG(FontNameBox, CustomGetSizeHdl, OutputDevice&, Size)
 {
-    return gUserItemSz;
+    return mbWYSIWYG ? gUserItemSz : Size();
 }
 
 namespace