jsdialog: support on demand rendering for icon view

- rename action: rendered_combobox_entry -> rendered_entry
- change generic get json property callback to more specialized
image getter as it wasn't used anywhere apart of that and we need
image enceded as base64 only not JSON
- add to the full update of icon view "ondemand" property to the entries
with images so LOK client will know it has to download the render
- it will be possible to support HiDPI renders in the future: added TODO

Signed-off-by: Szymon Kłos <szymon.klos@collabora.com>
Change-Id: I83a6e91133f8f9cb03e0bc794b51e1947435fa90
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/169622
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/170160
Tested-by: Jenkins

1 files changed, 7 insertions, 5 deletions

diff --git a/vcl/inc/iconview.hxx b/vcl/inc/iconview.hxx
index 54c2681a9e79..438590b083ab 100644
--- a/vcl/inc/iconview.hxx
+++ b/vcl/inc/iconview.hxx
@@ -47,20 +47,22 @@ public:
 
     virtual FactoryFunction GetUITestFactory() const override;
     virtual void DumpAsPropertyTree(tools::JsonWriter& rJsonWriter) override;
+    typedef std::tuple<OUString&, SvTreeListEntry*> encoded_image_query;
 
-    typedef std::tuple<tools::JsonWriter&, SvTreeListEntry*, std::string_view> json_prop_query;
-
-    void SetDumpElemToPropertyTreeHdl(const Link<const json_prop_query&, bool>& rLink)
+    void SetDumpImageHdl(const Link<const encoded_image_query&, bool>& rLink)
     {
-        maDumpElemToPropertyTreeHdl = rLink;
+        maDumpImageHdl = rLink;
     }
 
+    /// returns string with encoded image for an entry
+    OUString renderEntry(int pos, int dpix, int dpiy) const;
+
 protected:
     virtual void CalcEntryHeight(SvTreeListEntry const* pEntry) override;
 
 private:
     Link<SvTreeListEntry*, OUString> maEntryAccessibleDescriptionHdl;
-    Link<const json_prop_query&, bool> maDumpElemToPropertyTreeHdl;
+    Link<const encoded_image_query&, bool> maDumpImageHdl;
     void DumpEntryAndSiblings(tools::JsonWriter& rJsonWriter, SvTreeListEntry* pEntry);
 };