tdf#158750 Highlight the line where the cursor is positioned (Basic IDE)

This patch implements support for highlighting the selected line in the code editor, similar to what Kate, VSCode, etc do.

If the cursor is positioned in a single line and nothing is selected, then a highlight color is applied to the line. The line number window also highlights the selected line.

Change-Id: I2047d79500cd783b122b6752bb00996de0a7c702
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/161861
Tested-by: Jenkins
Reviewed-by: Andreas Heinisch <andreas.heinisch@yahoo.de>

1 files changed, 7 insertions, 0 deletions

diff --git a/basctl/source/basicide/baside2.hxx b/basctl/source/basicide/baside2.hxx
index c07141b7079f..cd0485c46b4b 100644
--- a/basctl/source/basicide/baside2.hxx
+++ b/basctl/source/basicide/baside2.hxx
@@ -105,6 +105,11 @@ private:
     bool            bDoSyntaxHighlight;
     bool            bDelayHighlight;
 
+    // Used to determine if the highlighted line has changed, which would require redrawing the highlight
+    sal_uInt32      m_nLastHighlightPara;
+
+    Color           m_aLineHighlightColor;
+
     virtual css::uno::Reference< css::awt::XVclWindowPeer > GetComponentInterface(bool bCreate = true) override;
     CodeCompleteDataCache aCodeCompleteCache;
     VclPtr<CodeCompleteWindow> pCodeCompleteWnd;
@@ -130,6 +135,7 @@ private:
     void            DoSyntaxHighlight( sal_uInt32 nPara );
     OUString        GetWordAtCursor();
     bool            ImpCanModify();
+    void            HighlightCurrentLine(vcl::RenderContext& rRenderContext);
 
 public:
                     EditorWindow (vcl::Window* pParent, ModulWindow*);
@@ -156,6 +162,7 @@ public:
 
     void            ChangeFontColor( Color aColor );
     void            UpdateSyntaxHighlighting ();
+    void            SetLineHighlightColor(Color aColor);
 
     void            SetEditorZoomLevel(sal_uInt16 nNewZoomLevel);
     sal_uInt16      GetCurrentZoom() { return nCurrentZoomLevel; }