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Listview

Posted on 2004-09-19
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Last Modified: 2010-04-05
How can i find out if the user right clicked on the column header of a listview - i know i can use oncolumnclick to find out when the user left clicked on the column heading but it does not give information on the right mouse button.
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Question by:tayto
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10 Comments
 
LVL 11

Expert Comment

by:calinutz
ID: 12097797
procedure TForm1.ListView1ColumnRightClick(Sender: TObject;
  Column: TListColumn; Point: TPoint);
begin

end;
0
 
LVL 11

Expert Comment

by:calinutz
ID: 12097804
procedure TForm1.ListView1ColumnRightClick(Sender: TObject;
  Column: TListColumn; Point: TPoint);
begin
ShowMessage(IntToStr(column.Index));
end;
0
 

Author Comment

by:tayto
ID: 12097952
ListView does not have any event of ListView1ColumnRightClick(Sender: TObject;
 Column: TListColumn; Point: TPoint);

I am using Delphi 4 Professional.
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LVL 12

Accepted Solution

by:
Ivanov_G earned 100 total points
ID: 12099590
procedure TForm1.ListView1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
  if Button = mbRight then
    begin
      // find what do you have at (X,Y)
    end;
end;
0
 
LVL 14

Assisted Solution

by:Pierre Cornelius
Pierre Cornelius earned 100 total points
ID: 12100088
You can use the MouseDown event as suggested by IvanovG or alternatively derive your own descendant class from the TDBGrid class. The advantage of deriving a new class instead is that you can register it as a new component and have it available as a design-time component which you can drop on the forms and have access to the new event ("OnCustomTitleClick" in below example):

e.g. 1 - Use of Mousedown event:
=====================
procedure TForm1.ListView1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
var Col: TColumn;
begin
  if Button = mbRight then
    begin
      Col:= Columns[RawToDataColumn(Cell.X)];
      ShowMessage(
      // find what do you have at (X,Y)
    end;
end;

e.g.2 - New derived custom grid class
========================
  TCustomTitleClickEvent = procedure (Column: TColumn; Button: TMouseButton;
                                 Shift: TShiftState; X, Y: Integer) of object;

  TMyDBGrid = class(TDBGrid)
    private
      FOnCustomTitleClick: TCustomTitleClickEvent;
    protected
      procedure MouseUp(Button: TMouseButton; Shift: TShiftState;
                        X, Y: Integer); override;
      procedure DoCustomTitleClick(Column: TColumn; Button: TMouseButton;
                                   Shift: TShiftState; X, Y: Integer);

    published
      property OnCustomTitleClick: TCustomTitleClickEvent
                                     read FOnCustomTitleClick
                                     write FOnCustomTitleClick;
      property FixedRows;
  end;

procedure TMyDBGrid.MouseUp(Button: TMouseButton; Shift: TShiftState; X,
  Y: Integer);
var
  Cell: TGridCoord;
begin
  inherited;
  Cell := MouseCoord(X,Y);

  if Cell.Y = 0 then
    DoCustomTitleClick(Columns[RawToDataColumn(Cell.X)], Button, Shift, x,y);
end;

procedure TMyDBGrid.DoCustomTitleClick(Column: TColumn;
  Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
var
  Cell: TGridCoord;
begin
  if Assigned(FOnCustomTitleClick)
    then FOnCustomTitleClick(Column, Button, Shift, X, Y);
end;


Kind regards
Pierre
0
 
LVL 14

Expert Comment

by:Pierre Cornelius
ID: 12100093
Sorry, I meant to have the following for example 1:

  if Button = mbRight then
    begin
      Col:= DBGrid1.Columns[DBGrid1.MouseCoord(x,y).x-1];
      ShowMessage('Column Title: '+ Col.Title.Caption+#13+
                  'Column Field: '+ Col.FieldName);
    end;
0
 

Author Comment

by:tayto
ID: 12103763
PierreC - i'm a little confused.  Derive from DBGrid to use a listview?


Ivanov_G  - i can find (X,Y) but translating it into which column title was clicked is the part i am having problems with
0
 

Author Comment

by:tayto
ID: 12103801
Ivanov_G - actually, using if Button = mbRight then in the mousedown event does not work when i click on the actual listview column title, only works when i click on a cell
0
 
LVL 12

Expert Comment

by:Ivanov_G
ID: 12105079
Yep... I tried it. OnColumnClick catch only left button and OnMouseDown/Up is not capture on header click ... Bad ...
0
 

Author Comment

by:tayto
ID: 12108296
It's ok - i finally worked out how to do it.  Had to write a sub-class of the component but it did the trick.

I decided to just split the points between both Ivanov_G and PierreC as they both at least tried to help.
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