lok: add more efficient getSelectionType() replacement

The getSelectionType() function usually needs to be followed by a call
to getTextSelection(), which means having them as two functions
leads to duplicating to a number of calls, some of which may be
somewhat expensive (pDoc->getSelection() e.g. for Calc builds
another ScDocument for the selection, and then getFromTransferrable()
converts that to the given format).

Change-Id: Ib0a8844701d80eaaff4834dcd3633c09d6b921b1
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/134603
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>

3 files changed, 35 insertions, 1 deletions

diff --git a/include/LibreOfficeKit/LibreOfficeKit.h b/include/LibreOfficeKit/LibreOfficeKit.h
index 6ebf81aacaa4..aff71dcc1f5d 100644
--- a/include/LibreOfficeKit/LibreOfficeKit.h
+++ b/include/LibreOfficeKit/LibreOfficeKit.h
@@ -472,6 +472,13 @@ struct _LibreOfficeKitDocumentClass
     /// @see lok::Document::sendContentControlEvent().
     void (*sendContentControlEvent)(LibreOfficeKitDocument* pThis, const char* pArguments);
 
+    /// @see lok::Document::getSelectionTypeAndText
+    /// @since LibreOffice 7.4
+    int (*getSelectionTypeAndText) (LibreOfficeKitDocument* pThis,
+                                    const char* pMimeType,
+                                    char** pText,
+                                    char** pUsedMimeType);
+
 #endif // defined LOK_USE_UNSTABLE_API || defined LIBO_INTERNAL_ONLY
 };
 
diff --git a/include/LibreOfficeKit/LibreOfficeKit.hxx b/include/LibreOfficeKit/LibreOfficeKit.hxx
index 827856c3ebeb..993654c88345 100644
--- a/include/LibreOfficeKit/LibreOfficeKit.hxx
+++ b/include/LibreOfficeKit/LibreOfficeKit.hxx
@@ -10,6 +10,7 @@
 #pragma once
 
 #include <LibreOfficeKit/LibreOfficeKit.h>
+#include <LibreOfficeKit/LibreOfficeKitEnums.h>
 #include <LibreOfficeKit/LibreOfficeKitInit.h>
 
 /*
@@ -363,6 +364,8 @@ public:
     /**
      * Gets the type of the selected content.
      *
+     * In most cases it is more efficient to use getSelectionTypeAndText().
+     *
      * @return an element of the LibreOfficeKitSelectionType enum.
      */
     int getSelectionType()
@@ -371,6 +374,30 @@ public:
     }
 
     /**
+     * Gets the type of the selected content and possibly its text.
+     *
+     * This function is a more efficient combination of getSelectionType() and getTextSelection().
+     * It returns the same as getSelectionType(), and additionally if the return value is
+     * LOK_SELTYPE_TEXT then it also returns the same as getTextSelection(), otherwise
+     * pText and pUsedMimeType are unchanged.
+     *
+     * @param pMimeType suggests the return format, for example text/plain;charset=utf-8.
+     * @param pText the currently selected text
+     * @param pUsedMimeType output parameter to inform about the determined format (suggested one or plain text).
+     * @return an element of the LibreOfficeKitSelectionType enum.
+     * @since LibreOffice 7.4
+     */
+    int getSelectionTypeAndText(const char* pMimeType, char** pText, char** pUsedMimeType = NULL)
+    {
+        if (LIBREOFFICEKIT_DOCUMENT_HAS(mpDoc, getSelectionTypeAndText))
+            return mpDoc->pClass->getSelectionTypeAndText(mpDoc, pMimeType, pText, pUsedMimeType);
+        int type = mpDoc->pClass->getSelectionType(mpDoc);
+        if(type == LOK_SELTYPE_TEXT && pText)
+            *pText = mpDoc->pClass->getTextSelection(mpDoc, pMimeType, pUsedMimeType);
+        return type;
+    }
+
+    /**
      * Gets the content on the clipboard for the current view as a series of binary streams.
      *
      * NB. returns a complete set of possible selection types if nullptr is passed for pMimeTypes.
diff --git a/include/LibreOfficeKit/LibreOfficeKitEnums.h b/include/LibreOfficeKit/LibreOfficeKitEnums.h
index 339b0183f153..63ddec957be0 100644
--- a/include/LibreOfficeKit/LibreOfficeKitEnums.h
+++ b/include/LibreOfficeKit/LibreOfficeKitEnums.h
@@ -53,7 +53,7 @@ typedef enum
 {
     LOK_SELTYPE_NONE,
     LOK_SELTYPE_TEXT,
-    LOK_SELTYPE_LARGE_TEXT,
+    LOK_SELTYPE_LARGE_TEXT, // unused (same as LOK_SELTYPE_COMPLEX)
     LOK_SELTYPE_COMPLEX
 }
 LibreOfficeKitSelectionType;