[Lazarus] Column ruler on TSynEdit

[Martin]

On 22/10/2013 12:28, Mark Morgan Lloyd wrote:
> Is there a painless way to get a column ruler at the top of a 
> TSynEdit, without having to do something like having multiple controls 
> in a frame and forcing sideways scrolling to track?
>

You can write a subclass of SynEdit, similar (but smaller than) to 
TIDESynEditor (in ide SourceSynEditor.pas)

using something like (this displays the procedure top hint)
     FTopInfoDisplay: TSourceLazSynTopInfoView;


That is reserving one line of the display for whatever you want it to be.
It is some work though....


Or go the full 9 yards: Implement a top/bottom gutter (and submit it as 
patch).

In synedit, you have
     FPaintArea: TLazSynSurfaceManager;


   FPaintArea := TLazSynSurfaceManager.Create(Self);
   FPaintArea.TextArea := FTextArea;
   FPaintArea.LeftGutterArea := FLeftGutterArea;
   FPaintArea.RightGutterArea := FRightGutterArea;
   FPaintArea.DisplayView := FDisplayView;


So that allows to add top/bottom gutter, and reserve the space needed 
(set correct boundaries for all other elements.

Note there must be no gaps between them. Gaps will not be painted at all.