[fpc-pascal] Directory Tree

[Jean SUZINEAU]

Le 15/04/2021 à 20:16, James Richters via fpc-pascal a écrit :
> It doesn't have to be a PDF, it could be an image file, or even a text 
> file...maybe I can just make a text file of the output and use box 
> characters to draw the tree. It seems like I should be able to get the 
> branches of the treedata somehow and just do a writeln to a file with 
> the right formatting. 

I have added a text rendering of the tree, it's saved in a text file 
Result.txt.

The rendering code is in unit uFileVirtualTree, function 
ThVirtualStringTree.render_as_text. It's called  in ufFileVirtualTree in 
procedure TfFileVirtualTree.bGetCheckedClick:
      m.Lines .Text:= slResult.Text+#13#10+hvstResult.render_as_text;
      m.Lines .SaveToFile('Result.txt');

In function ThVirtualStringTree.render_as_text I used 3 constants for 
the chars used for drawing the tree outline:
            vertical_line_char='|';
            horizontal_line_char='-';
            angle_char='*';
            crossing_char='L';
You can tune this to your needs.

I have added to a rendering as numbered list in an odt file, the text 
file format for Libre Office and Open Office. The "template" 
FileTree.odt is duplicated with a temp name in the user temp directory, 
and opened in the software register in windows for opening odt files by 
the function OpenDocument() of Lazarus. Depending on your installation 
it can be open in Libre Office/OpenOffice or in MS Word (sometimes the 
rendering is not perfect in Word).

Before recompiling the project, you will need to open first in Lazarus 
the package pascal_o_r_mapping\02_Units\OD_DelphiReportEngine_Units.lpk 
in order to make Lazarus know where it is.
If for some reason you can't load this package, you can remove it from 
the dependency  panel of the project inspector, and in unit 
ufFileVirtualTree, comment out in the use clause the unit 
uFileVirtualTree_odt, and comment out in procedure 
TfFileVirtualTree.bGetCheckedClick the line:
      OpenDocument( FileVirtualTree_odt( 'FileTree.odt', hvstResult));

I've considered making a screenshot of virtual tree component but if the 
whole opened tree doesn't fit in the screen it will not work.