[QScintilla] Patch for scroll width and scroll width tracking messages

[Manuel Gómez]

Hi,

The attached patch adds methods for the following Scintilla messages:

SCI_SETSCROLLWIDTH
SCI_GETSCROLLWIDTH
SCI_SETSCROLLWIDTHTRACKING
SCI_GETSCROLLWIDTHTRACKING

The patch has been developed for the DB Browser for SQLite and works 
well for avoiding the unnecessary display of the horizontal scroll bar.

See this for explanation:

https://github.com/jacobslusser/ScintillaNET/issues/216

Regards
--
Manuel

-------------- next part --------------
diff --git a/libs/qscintilla/Qt4Qt5/Qsci/qsciscintilla.h b/libs/qscintilla/Qt4Qt5/Qsci/qsciscintilla.h
index 3b5f185..49ca5cc 100644
--- a/libs/qscintilla/Qt4Qt5/Qsci/qsciscintilla.h
+++ b/libs/qscintilla/Qt4Qt5/Qsci/qsciscintilla.h
@@ -2009,6 +2009,34 @@ public slots:
     //! \sa zoomIn(), zoomOut()
     virtual void zoomTo(int size);

+    //! For performance, Scintilla does not measure the display width
+    //! of the document to determine the properties of the horizontal
+    //! scroll bar. Instead, an assumed width is used.  This sets the
+    //! document width in pixels assumed by Scintilla to \a
+    //! pixelWidth. The default value is 2000.
+    //!
+    //! \sa getScrollWidth(), setScrollWidthTracking()
+    virtual void setScrollWidth(int pixelWidth);
+
+    //! Gets the document width in pixels assumed by Scintilla.
+    //!
+    //! \sa setScrollWidth(), setScrollWidthTracking()
+    virtual int getScrollWidth() const;
+
+    //! If scroll width tracking is enabled then the scroll width is
+    //! adjusted to ensure that all of the lines currently displayed
+    //! can be completely scrolled. This mode never adjusts the scroll
+    //! width to be narrower.
+    //! Sets the scroll width tracking to \a enabled.
+    //!
+    //! \sa setScrollWidth(), getScrollWidthTracking()
+    virtual void setScrollWidthTracking(bool enabled);
+
+    //! Gets the current scroll width tracking mode.
+    //!
+    //! \sa getScrollWidth(), setScrollWidthTracking()
+    virtual bool getScrollWidthTracking() const;
+
 signals:
     //! This signal is emitted whenever the cursor position changes.  \a line
     //! contains the line number and \a index contains the character index
diff --git a/libs/qscintilla/Qt4Qt5/qsciscintilla.cpp b/libs/qscintilla/Qt4Qt5/qsciscintilla.cpp
index 4c9fe75..31dc579 100644
--- a/libs/qscintilla/Qt4Qt5/qsciscintilla.cpp
+++ b/libs/qscintilla/Qt4Qt5/qsciscintilla.cpp
@@ -4481,3 +4481,26 @@ static QColor asQColor(long sci_colour)
             ((int)(sci_colour >> 8)) & 0x00ff,
             ((int)(sci_colour >> 16)) & 0x00ff);
 }
+
+void QsciScintilla::setScrollWidth(int pixelWidth)
+{
+    SendScintilla(SCI_SETSCROLLWIDTH, pixelWidth);
+}
+
+int QsciScintilla::getScrollWidth() const
+{
+    return SendScintilla(SCI_GETSCROLLWIDTH);
+}
+
+void QsciScintilla::setScrollWidthTracking(bool enabled)
+{
+    SendScintilla(SCI_SETSCROLLWIDTHTRACKING, enabled);
+}
+
+bool QsciScintilla::getScrollWidthTracking() const
+{
+    return SendScintilla(SCI_GETSCROLLWIDTHTRACKING);
+}
+
+
+