TStringGrid Labeling outside column - delphi

I am having some issues with a piece of code I wrote. I am using a TStringGrid to draw a seating plan.
What it is supposed to do is label the fixedcol and fixedrow with the letter down the column and numbers for the rows.
My problem is i don't know how to change my code so that it excludes the cell [0,0]. It is also not labeling all the rows.
procedure TfrmDraw.FormCreate(Sender: TObject);
var
i, j, k: Integer;
begin
sgFloor.RowCount := adotSeats['Rows'] + 1;
sgFloor.ColCount := adotSeats['Seats_per_Row'] + 1;
for i := 0 to SgFloor.RowCount do
begin
for j := 0 to SgFloor.ColCount do
begin
if i = 0 then
SgFloor.Cells[i,j] := Chr(65 + j)
else
if j = 0 then
begin
for k := 1 to sgFloor.ColCount do
SgFloor.Cells[i,0] := IntToStr(i) ;
end;
end;
end;
end;
Screenshot:
Thanks

Some good advice:
I know how easy it is to use the RAD style components,
but try not to bind GUI logic and application logic.
This will make your code cleaner and easier to read and maintain.
Also use meaningful names for your variables, doing this will prevent stupid mistakes.
Now about your problem,
the Grid uses 0-based indexes so the last Index is one less as the count.
The fixed row and column both have Index 0 in your case which means we have to start iterating from the next index, which is 1, I used the FixedRows and FixedCols properties to make it more readable. This has the added bonus that it will label the most inner fixed Rows/Cols if you have more than one Fixed row/column. It is easier to make 2 separate loops, one for the header row and one for the columns :
procedure SetupGrid(Grid : TStringGrid; Rows, Columns : Integer);
var
Row, Col: Integer;
begin
Grid.FixedCols := 1;
Grid.FixedRows := 1;
Grid.RowCount := Rows + Grid.FixedRows;
Grid.ColCount := Columns + Grid.FixedCols;
for Row := Grid.FixedRows to Grid.RowCount-1 do
Grid.Cells[0, Row] := Chr(Ord('A') + Row-1);
for Col := Grid.FixedCols to Grid.ColCount-1 do
Grid.Cells[Col, 0] := IntToStr(Col);
end;
procedure TfrmDraw.FormCreate(Sender: TObject);
begin
// try to make your GUI events as lightweight as possible and seal
// your code into separate functions/classes, this will improve readability
// of the GUI units and it will make your code testable
SetupGrid(sgFloor, adotSeats['Rows'], adotSeats['Seats_per_Row']);
end;

Related

Delphi Selection Sort seems to sort backwards

procedure TfrmSorting.btnSortClick(Sender: TObject);
var
K,L,I,iNumElements : integer;
sKeep : string;
begin
iNumElements := length(arrNames);
for K := 1 to iNumElements - 1 do
begin
for L := K + 1 to iNumElements do
begin
if arrNames[K] < arrNames[L] then
begin
sKeep := arrNames[L];
arrNames[L] := arrNames[K];
arrNames[K] := sKeep;
end;
end;
end;
reditNames.Lines.Clear;
I := 1;
for K := 1 to iNumElements - 1 do
begin
reditNames.Lines.Add(arrNames[I]);
I := I + 1;
end;
end;
I'm using this sorting algorithm to sort an Array. I then diplay the contents on a richedit but instead of going from A..Z its displays Z..A. Is there a problem with the algorithm or the way im adding lines to the richedit? Thanks
K is less than L and you swap items if the K-th is less than the L-th. You have your comparison the wrong way round. Use > rather than <.
Your indexing is dubious also. Is your array really 1-based? And why do you only add 1 to N-1 to the output? Are you missing the last item In other words, I suspect there are other defects in your code. You have not shown it all so I cannot be sure.
Finally, why not use the built in sorting functionality?

Variable in for loop is not getting called

I am using DBXJson to parse a simple json file called response.jsonand show it's contents in a grid, but only the first row of the grid ever gets populated with the data and even though there is more rows/data to display. I am using a custom grid in the code below but I have tried a variation of the below code using the standard stringgrid and it exhibited the same behavior. This is the code I am using to parse the response and show it in my grid.
var
sl: TStringList;
LJsonArr: TJSONArray;
LJsonValue: TJSONValue;
LItem: TJSONValue;
col, row: Integer;
begin
col := 0;
row := 0;
sl := TStringList.Create;
sl.LoadFromFile('response.txt');
LJsonArr := TJSONObject.ParseJSONValue(TEncoding.UTF8.GetBytes(sl.text), 0)
as TJSONArray;
for LJsonValue in LJsonArr do
begin
NextGrid1.AddRow();
for LItem in TJSONArray(LJsonValue) do
begin
NextGrid1.Cells[col, row] := TJSONPair(LItem).JsonValue.Value;
inc(col);
end;
inc(row);
end;
sl.Free;
end;
I suspect that the problem lies in the fact that the row variable is out of place and is not getting called and that is causing only the first row to display, but I could be mistaken and I am hoping that a fresh pair of eyes can spot the problem.
The problem is that col must be re-initialised to zero every time you start a new row. So move the initialization of col into the outer loop.
row := 0;
for LJsonValue in LJsonArr do
begin
col := 0;
NextGrid1.AddRow();
for LItem in TJSONArray(LJsonValue) do
begin
NextGrid1.Cells[col,row] := TJSONPair(LItem).JsonValue.Value;
inc(col);
end;
inc(row);
end;
I don't know this JSON library but if it allows you to access array elements with random access then a traditional oindexed for loop would lead to cleaner code that the for in loop that you use. In pseudo code:
for row := 0 to arr.length do
begin
item := arr[row];
for col := 0 to item.length do
grid.Cells[col,row] := item[col];
end;
As a rule of thumb, for in loops are better if you do not need to know the item index. However, as soon as you need to know the item index then traditional indexed for loops are usually to be preferred.

Sort several arrays together and return the ranking number in the all-arrays combined score

I have 2 tables like this
As you can see, if you look at Total you can see the score of each player in 3 rounds. I have to do a list (from the 1st to the 12th) indicating the highest score.
Here the player with 28 points, must have the number 1 (instead of that 8 which is generated by default), the player with 22 must have the number 2 instead of 11... So I have to sort the TOTAL columns and return the position in the correct label.
When I click the button I underlined, the procedure is called:
var vettore:array[1..12] of integer;
indici:array[1..12] of integer;
i:smallint;
begin
for i := 1 to 6 do
begin
vettore[i]:= StrToInt(StringGrid1.Cells[5,i]); //col,row
indici[i] := i;
end;
for i := 6 to 12 do
begin
vettore[i]:= StrToInt(StringGrid2.Cells[5,i]); //col,row
indici[i] := i;
end;
In this way I load inside vettore all the TOTAL numbers in the rows of both tables, and in indici you can find the number of the label on the right of the table (they indicates the position). Now I thought I could use any sorting method since I have only 12 elements (like the Quick Sort).
My problem is this: how can I change the labels texts (the ones on right of the tables) according with the sorted array? It's like the picture above shows.
Every label is called (starting from 1) mvp1, mvp2, mvp3, mvp4... I think this can be helpful because if (maybe) I will have to do a for loop for change the text of each label, I can use a TFindComponent.
If it could be helpful, here there is the function I wrote with javascript on my website (it works):
var totals = [], //array with the scores
indices = []; //array with the indices
for (var i=0; i<6; i++) {
totals[i] = parseInt(document.getElementById('p'+i).value, 10);
indices[i] = i;
}
for (var i=6; i<12; i++) {
totals[i] = parseInt(document.getElementById('p'+i).value, 10);
indices[i] = i;
}
indices.sort(function(a, b) {
return totals[b]- totals[a];
});
for (var i=0; i<indices.length; i++) {
document.getElementById('mvp'+(indices[i]+1)).value = (i+1);
}
AS. Since only delphi is listed in tags, that means that any Delphi version is okay. I'd refer to delphi-xe2.
1st we would use Advanced Records to hold the data for a single participant. Some links are below, google for more.
http://docwiki.embarcadero.com/RADStudio/XE5/en/Structured_Types#Records_.28advanced.29
http://delphi.about.com/od/adptips2006/qt/newdelphirecord.htm
http://sergworks.wordpress.com/2012/03/13/record-constructors-in-delphi/
.
type
TClanResults = record
public
type All_GPs = 1..3;
var GP: array [All_GPs] of Cardinal;
var Players: string;
var Clan_ID: integer;
private
function CalcTotal: Cardinal;
function CalcAverage: single; inline;
public
property Total: Cardinal read CalcTotal;
property AVG: single read CalcAverage;
end;
{ TClanResults }
function TClanResults.CalcAverage: single;
begin
Result := Self.Total * ( 1.0 / Length(GP) );
end;
function TClanResults.CalcTotal: Cardinal;
var score: cardinal;
begin
Result := 0;
for score in GP do
Inc(Result, score);
end;
The expression Self.Total * ( 1.0 / Length(GP) ); can be also written as Self.Total / Length(GP). However i'd like to highlight some Delphi quirks here.
in Pascal there are two division operators: float and integer; 3 div 2 = 1 and 3 / 2 = 1.5. Choosing wrong one causes compilation errors at best and data precision losses at worst.
I'd prefer explicit typecast from integer Length to float, but Delphi does not support it. So i multiply by 1.0 to cast. Or i may add 0.0.
Division takes a lot longer than multiplication - just do it with pen and paper to see. When you have a data-crunching loop, where all elements are divided by the same number, it is good idea to cache 1 / value into a temp variable, and then mutiply each element by it instead. Since GP is of fixed size, it is compiler that calculates (1.0 / Length(GP)) and substitutes this constant. If you would allow different clans to have different amount of games - and turn GP into being dynamic arrays of different sizes - you would be to explicitly add a variable inside the function and to calc coeff := 1.0 / Length(GP); before loop started.
Now we should make a container to hold results and sort them. There can be several approaches, but we'd use generics-based TList<T>.
http://docwiki.embarcadero.com/Libraries/XE5/en/System.Generics.Collections.TList
http://docwiki.embarcadero.com/Libraries/XE5/en/System.Generics.Collections.TList.Sort
http://docwiki.embarcadero.com/Libraries/XE5/en/System.Generics.Defaults.TComparer.Construct
http://docwiki.embarcadero.com/Libraries/XE5/en/System.Generics.Defaults.TComparison
The TList is an object, so you would have to CREATE it and to FREE it. I think you can make it a PUBLIC property of your MainForm, then create the list in TMainForm.OnCreate event and free it in TMainForm.OnDestroy event.
Another, lazier approach, would be using a regular dynamic array and its extensions.
http://docwiki.embarcadero.com/RADStudio/XE5/en/Structured_Types#Dynamic_Arrays
http://docwiki.embarcadero.com/Libraries/XE5/en/System.TArray
http://docwiki.embarcadero.com/Libraries/XE5/en/System.SetLength
http://docwiki.embarcadero.com/Libraries/XE5/en/System.Generics.Collections.TArray.Sort
http://docwiki.embarcadero.com/CodeExamples/XE5/en/Generics_Collections_TArray_(Delphi)
However, i'll use TList below. Again, i assume that other routines in you program already and correctly create and destroy the given var ClanData: TList<TClanResults>; object instance.
type
TClansTable = TList<TClanResults>;
procedure TMainForm.Input;
var row: TClanResults
begin
Self.ClanData.Clear;
row.Clan_ID := 1;
row.Players := JclStringList.Add(['John', 'James', 'Jenny']).Join(' and ');
row.GP[1] := 2;
row.GP[1] := 5;
row.GP[1] := 7;
Self.ClanData.Add(row);
row.Clan_ID := 2;
row.Players := JclStringList.Add(['Mary', 'Mark', 'Marge']).Join(' and ');
row.GP[1] := 3;
row.GP[1] := 6;
row.GP[1] := 2;
Self.ClanData.Add(row);
...
end;
procedure SortOnTotal(const Table: TClansTable);
begin
Table.Sort(
TComparer<TClanResults>.Construct(
function(const Left, Right: TClanResults): Integer
begin Result := - (Left.Total - Right.Total) end
// negating since we need reversed order: large to little
)
);
end;
Now finally we need to know how to show that table on the screen. I would use typical TStringGrid as the most simplistic widget. I suggest you to look some advanced string grid from JediVCL or something from Torry.net so you would be able to specify columns styles. It is obvious that integers should be right-aligned on the screen and averages should be comma-aligned. However stock TStringGrid does not have kind of GetCellStyle event, so you would need some advanced grid derivative to add it. It is left as your home-task.
http://docwiki.embarcadero.com/RADStudio/XE5/en/String_Grids
http://docwiki.embarcadero.com/Libraries/XE5/en/Vcl.Grids.TStringGrid_Properties
Delphi TStringGrid Flicker - remains as your homework too.
.
procedure TMainForm.DumpTableToGrid(const Data: TClansTable; const grid: TStringGrid);
const TableFields = 8;
var row: integer;
ss: array of string;
res: TClanResults;
procedure DumpTheRow; var col: integer;
begin
for col := 0 to TableFields - 1 do begin
grid.Cells[ col, row ] := ss[ col ];
end;
begin
grid.Options := [ goFixedVertLine, goVertLine, goHorzLine, goColSizing, goColMoving, goThumbTracking ];
grid.ColCount := TableFields;
SetLength( ss, TableFields );
grid.RowCount := 1 + Data.Count;
grid.FixedRows := 1;
grid.FixedColumns := 1;
row := 0; // headers
ss[0] := ''; // number in the row, self-evident
ss[1] := 'Players';
ss[2] := 'GP 1';
....
ss[7] := 'Clan ID';
DumpTheRow;
for res in Data do begin // we assume Data already sorted before calling this
Inc(row);
ss[0] := IntToStr( row );
ss[1] := res.Players;
ss[2] := IntToStr( res.GP[1] );
...
ss[6] := FloatToStrF( res.AVG, ffFixed, 4, 2);
ss[7] := IntToStr( res.Clan_ID );
DumpTheRow;
end;
end;
Now, it is unclear what you mean by those labels. I can guess, that you want to show there ranks according to both your two clans combined positions. The externals labels are a bad idea for few reasons.
FindComponent is not too fast. Okay, you may find them once, cache in array of TLabel and be done. But why bother with extra workarounds?
user may resize the window, making it taller or shorter. Now there are 3 labels visible, in a minute there would be 30 labels visible, in a minute there will be 10 labels... How would you re-generate them in runtime ? So there would be enough of those always and in proper positions ? Actually just put them into the grid itself.
VCL sucks at form scaling. Now that Winodws 8.1 is out the fonts resolution might be different on different displays. There would be usually 96DPI on you main display, but as you would drag the window onto your secondary display there would be 120DPI, and on your mate's laptop (examples: Lenovo ThinkPad Yoga Pro and Lenovo IdeaPad Yoga 2) there might be like 200DPI or Retina-grade 300DPI. Still you would have to control your labels so their text would be shown exactly to the right of grid rows text, no matter what value would be rows of each height and each font.
So, i think they should be INSIDE the row. If you want to highlight them - use bold font, or coloured, or large, or whatever inside the grid.
TRanks = record min, max: word; end;
TClanResults = record
...
RanksCombined: TRanks;
...
end;
You correctly shown that some clans might have the same results and share the rank.
Before continuing you, as a JS user, have to notice a basis difference between record and class datatypes. record is operated by value while class is operated by reference. That means for class instances and variables you have to manually allocate memory for new elements and to dispose it for no longer used ones. Since class variable is a reference to some anonymous class instance(data). Hence the different containers of class-type elements can point to the single real element(data, instance), providing for easy data changing and cheaper sorting. Then for record instances (and record variable IS record data) you don't care about memory allocation and life times, yet would have copying data between different record instances, and if you change the one instance, to apply it to other containers you would have to copy it back. This difference is very visible in for element in container loops, whether we can change element.field or not.
http://docwiki.embarcadero.com/Libraries/XE2/en/System.Generics.Collections.TObjectList.Create
So let us have few more data structures for sorting and calculating. For example
TAvgAndRanks = class
avg: single; rank: TRanks;
table: TClansTable; idx: integer;
end;
We'll have then modification for the data dumper:
procedure TMainForm.DumpTableToGrid(const Data: TClansTable; const grid: TStringGrid);
const TableFields = 9;
...
row := 0; // headers
....
ss[7] := 'Clan ID';
ss[8] := 'Rank';
DumpTheRow;
...
ss[7] := IntToStr( res.Clan_ID );
with res.RanksCombined do
if min = max
then ss[9] := IntToStr(min)
else ss[9] := IntToStr(min) + ' - ' + IntToStr(max);
DumpTheRow;
Another approach would be to keep ranks externally using something like
TClanPtr = record table: TClansTable; idx: integer; end;
TClanSortData = record avg: single; rank: TRanks; end;
TClanRanksCombined = TDictionary<TClanPtr, TClanSortData>;
This approach is more extensible (allows in different window "attach" different extended data to the clans), but would require much more boilerplate. If you liek it more, your homework would be to implement it.
procedure MakeRanks(const clans: array of TClansTable);
var tab: TClansTable; idx: integer;
total: TObjectList<TAvgAndRanks>;
ar : TAvgAndRanks;
res: TClanResults;
// for spanning ranks with same avg
r_curr, r_min: word;
r_span, r_idx: integer;
r_avg: single;
r_chg: boolean;
begin
total := TObjectList<TAvgAndRanks>.Create( True ); // auto-free by container
try
for tab in clans do
for idx := 0 to tab.Count - 1 do begin
res := tab[ idx ];
ar := TAvgAndRanks.Create; // but creation is still manual
ar.table := tab;
ar.idx := idx;
ar.avg := res.AVG;
total.Add(ar);
end;
if total.Count <= 0 then Abort;
if total.Count = 1 then begin
ar := total[0];
res := ar.table[ ar.idx ];
res.RanksCombined.min := 1;
res.RanksCombined.max := 1;
ar.table[ ar.idx ] := res; // copying back updated data
Exit; // from procedure - nothing to do
end;
total.Sort(
TComparer<TAvgAndRanks>.Construct(
function(const Left, Right: TAvgAndRanks): Integer
begin Result := - (Left.avg - Right.avg) end
// negating since we need reversed order: large to little
)
);
(***** calculating ranks with spans ****)
r_curr := 1;
r_min := 1;
r_span := 0;
r_idx := 0;
r_avg := total[0].avg;
for idx := 1 to total.Count - 1 do begin
ar := total[ idx ];
inc(r_curr);
if r_avg = ar.avg then inc(r_span);
if (r_avg <> ar.avg) or (idx = total.Count - 1) then begin
for r_idx := r_idx to r_idx + r_span do begin
with total[ r_idx ] do begin // class == reference, can update directly
rank.min := r_min;
rank.max := r_min + r_span;
end;
end;
Assert( (r_curr = r_min + r_span + 1) or ( r_avg = ar.avg ) );
r_min := r_curr;
r_span := 0;
r_idx := idx;
r_avg := ar.avg;
end;
end;
(*** saving calculated ranks ***)
for ar in total do begin
res := ar.table[ ar.idx ];
res.RanksCombined := ar.ranks;
ar.table[ ar.idx ] := res; // copying back updated data
end;
finally
Total.Destroy;
end;
end;

Delete row in StringGrid- Delphi

I want to make something like that. I have a list in my StringGrid and i want to delete one row by selecting cell and then clicking the button. Then this list should show again in StringGrid without this row. The biggest problem i have with deleting row, i tried whis one procedure but it only deleted row in StringGrid, not in list, i think.
procedure DeleteRow(Grid: TStringGrid; ARow: Integer);
var
i: Integer;
begin
for i := ARow to Grid.RowCount - 2 do
Grid.Rows[i].Assign(Grid.Rows[i + 1]);
Grid.RowCount := Grid.RowCount - 1;
end;
Please someone for help. :)
If you're using a standard VCL TStringGrid (without using the live bindings made available in recent versions), you can use an interposer class to access the protected TCustomGrid.DeleteRow method.
The following code has been tested in Delphi 2007. It uses a simple TStringGrid dropped on a form, with the default columns and cells, and a standard TButton.
The TForm.OnCreate event handler simply populates the grid with some data to make it easier to see the deleted row. The button click event deletes row 1 from the stringgrid every time it's clicked.
Note: The code does no error checking to make sure that there are enough rows. This is a demo application and not an example of production code. Your actual code should check the number of rows available before attempting to delete one.
// Interposer class, named to indicate it's use
type
THackGrid=class(TCustomGrid);
// Populates stringgrid with test data for clarity
procedure TForm1.FormCreate(Sender: TObject);
var
i, j: Integer;
begin
for i := 1 to StringGrid1.ColCount - 1 do
StringGrid1.Cells[i, 0] := Format('Col %d', [i]);
for j := 1 to StringGrid1.RowCount - 1 do
begin
StringGrid1.Cells[0, j] := Format('Row #d', [j]);
for i := 1 to StringGrid1.ColCount - 1 do
begin
StringGrid1.Cells[i, j] := Format('C: %d R: %d', [i, j]);
end;
end;
end;
// Deletes row 1 from the stringgrid every time it's clicked
// See note above for info about lack of error checking code.
procedure TForm1.Button1Click(Sender: TObject);
begin
THackGrid(StringGrid1).DeleteRow(1);
end;
If you're using a more recent version, and have attached the data to the grid using live bindings, you can just delete the row from the underlying data and let the live bindings handle removing the row.
The selected row can be retrieved StringGrid1.selected and the you can call the following procedure.
procedure TUtils.DeleteRow(ARowIndex: Integer; AGrid: TStringGrid);
var
i, j: Integer;
begin
with AGrid do
begin
if (ARowIndex = RowCount) then
RowCount := RowCount - 1
else
begin
for i := ARowIndex to RowCount do
for j := 0 to ColumnCount do
Cells[j, i] := Cells[j, i + 1];
RowCount := RowCount - 1;
end;
end;
end;

How to find the actual width of grid component with scrollbar in Delphi

I have a grid component (DBGrid) which has lots of columns on it. Because of large number of columns, a scrollbar was created, and thus some part of grid remains hidden. I need to find out what is the real width of DBGrid, including the part which is not shown due to scroll bar. But Width property gives only the width of the component itself. Anybody has any idea?
TDBGrid has a Columns property. Each of the columns has its own Width property. So you could loop through all of the columns and sum up their widths.
Like this:
function TotalColumnsWidth(var AGrid: TDBGrid);
var
i: Integer;
begin
Result := 0;
for i := to AGrid.Columns.Count - 1 do
Result := Result + AGrid.Columns[i].Width;
end;
Perhaps this may be helpful. It is part of a class helper for TDBGrid that auto sizes the last column, so that the grid has no empty space. Should be easy to adjust to your needs.
As you may notice, the CalcDrawInfo method is what you are seeking for. As it is protected you can either use a class helper or the usual protected-hack to get hands on it.
procedure TDbGridHelper.AutoSizeLastColumn;
var
DrawInfo: TGridDrawInfo;
ColNo: Integer;
begin
ColNo := ColCount - 1;
CalcDrawInfo(DrawInfo);
if (DrawInfo.Horz.LastFullVisibleCell < ColNo - 1) then Exit;
if (DrawInfo.Horz.LastFullVisibleCell < ColNo) then
ColWidths[ColNo] := DrawInfo.Horz.GridBoundary - DrawInfo.Horz.FullVisBoundary
else
ColWidths[ColNo] := ColWidths[ColNo] + DrawInfo.Horz.GridExtent - DrawInfo.Horz.FullVisBoundary
end;
I think I have found a solution (although it seems a little strange). In order to find the difference between column widths and real width of the DBgrid (that means find the width of the empty space left after last column), we need to keep track of which column is shown on the left now (what is current column that is scrolled to). We can do that using OnDrawColumnCell event, since it will draw only columns which are scrolled on now. Then we need to calculate sum of widths of all visible columns, and subtract that from DBGrid's width. P.S. Sorry for bad english
Ex code:
For i:=0 to Last do
if Vis[i] then
Begin
Sum:=Sum+DBG.Columns[i].Width;
Inc(Cnt);
End;
if dgColLines in DBG.Options then
Sum := Sum + Cnt;
//add indicator column width
if dgIndicator in DBG.Options then
Sum := Sum + IndicatorWidth;
Dif:=DBG.ClientWidth - Sum;
Here are functions we have used in the past. It takes into account the width of data based on the font and also compensates for vertical lines if they are visible
function GridTextWidth(fntFont : TFont; const sString : OpenString) :
integer;
var
f: TForm;
begin
try
f:=TForm.Create(nil);
f.Font:=fntFont;
result:=f.canvas.textwidth(sstring);
finally
f.Free;
end;
end;
function CalcGridWidth(dbg : TDBGrid { the grid to meaure }): integer; { the "exact" width }
const cMEASURE_CHAR = '0';
iEXTRA_COL_PIX = 4;
iINDICATOR_WIDE = 11;
var i, iColumns, iColWidth, iTitleWidth, iCharWidth : integer;
begin
iColumns := 0;
result := GetSystemMetrics(SM_CXVSCROLL);
iCharWidth := GridTextWidth(dbg.font,cMeasure_char);
with dbg.dataSource.dataSet do begin
DisableControls;
for i := 0 to FieldCount - 1 do with Fields[i] do
if visible then
begin
iColWidth := iCharWidth * DisplayWidth;
if dgTitles in dbg.Options then begin
ititlewidth:=GridTextWidth(dbg.titlefont,displaylabel);
if iColWidth < iTitleWidth then
iColWidth := iTitleWidth;
end;
inc(iColumns, 1);
inc(result, iColWidth + iEXTRA_COL_PIX);
end;
EnableControls;
end;
if dgIndicator in dbg.Options then
begin
inc(iColumns, 1);
inc(result, iINDICATOR_WIDE);
end;
if dgColLines in dbg.Options then
inc(result, iColumns)
else
inc(result, 1);
end;

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