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Posted 7 Oct 2001

A WTL Grid

, 22 Jan 2002
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A WTL grid (really).

Sample Image - WtlGrid.gif


After using WTL for some time, I've developed the control that I miss the most for the kind of project that I do : A grid.
This one is written from scratch, derived from a CScrollWindowImpl, it has the following features :

  • Grid is a vector of vector of CString.
  • It has a optional Toolbar where to add buttons with tooltip for edition operation (see screenshot).
  • Resizable column title
  • In place edit using a edit box, a combo box or a check-box.
  • Collapsible tree like behavior.
  • Overwritable behavior (BeforeEdit, AfterEdit, CellRendering, etc) via a derivable listener class.
Using it should be pretty straightforward:
#include <span class="code-string">"WtlGrid.h"

The inner code is also designed to be easy to understand, you'll find the following classes :


a cell value, stored as a CString.


a cell with a render mode.


a column, with header, etc.


a column collection, a vector of column.


a grid row, holding a vector of WtlGridCell.


a collection of rows.


the control itself, containing columns and rows.


a wrapper control for the toolbar and the column header, this is the control that you include in your app.

Some behavior, especially the way cell are rendered and edited can be changed by overwriting a listener class, eg:

class LevelListener : public WtlGridListener 
 public : 

  virtual bool after_edit(WtlGrid *grid, CString &old_value, 
                          int row_nb, int column_nb,void *user,bool add);
  virtual bool after_select(WtlGrid *grid,int row_nb,int column_nb,void *user);
  virtual bool toolbar_button(WtlGrid *grid,int button_nb,void *user);
  virtual bool header_select(WtlGrid *grid,int header_nb,void *user);
  virtual bool render(WtlGrid *grid,CDCHandle dc, CRect &rc,
                      WtlGridRow *row,WtlGridCell *cell,void *user);
  virtual WtlGridColumn::e_edit_mode before_edit(WtlGrid *grid,
                                                 int row_nb, int column_nb,
                                                 void *user);

What is missing:

  • Obviously, the grid should be bindable to a database, and do it virtually (not loading all the records in memory), this will be my next move.
  • A lot of features...
I would be grateful to get comments and enhancement to this code, enjoy ...


This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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About the Author

Noel Frankinet
Architect strategis
Belgium Belgium
No Biography provided

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Comments and Discussions

GeneralRe: some major issues in thinking Pin
MoonlightM27-May-04 4:52
memberMoonlightM27-May-04 4:52 
GeneralA few suggested modifications Pin
anonymous26-Feb-02 2:36
memberanonymous26-Feb-02 2:36 
GeneralRe: A few suggested modifications Pin
JusticeMonger31-Oct-03 4:38
sussJusticeMonger31-Oct-03 4:38 
GeneralRedraw problem with example Pin
Raj_Sidhu1-Feb-02 5:16
memberRaj_Sidhu1-Feb-02 5:16 
GeneralRe: Redraw problem with example Pin
NMTop4011-Feb-02 4:25
memberNMTop4011-Feb-02 4:25 
GeneralNeed MoveWindow Pin
Anonymous26-Oct-01 13:31
memberAnonymous26-Oct-01 13:31 
GeneralI would be grateful... Pin
Darren Schroeder8-Oct-01 15:50
memberDarren Schroeder8-Oct-01 15:50 
GeneralRe: I would be grateful... Pin
Reckless22-Oct-01 1:54
memberReckless22-Oct-01 1:54 
Yes, good plan! Anyone got a working example of this in use?

Thanks in advance!

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