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|
{
fpGUI - Free Pascal Graphical User Interface
Copyright (C) 2000 - 2001 by
Areca Systems GmbH / Sebastian Guenther
Copyright (C) 2006 by Graeme Geldenhuys
member of the fpGUI development team.
Grid class declarations
See the file COPYING.fpGUI, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************}
{%mainunit fpgui.pp}
{$IFDEF read_interface}
// -------------------------------------------------------------------
// TCustomGrid
// -------------------------------------------------------------------
EInvalidGridOperation = class(Exception);
TGridDrawState = set of (gdSelected, gdFocused, gdFixed);
PIntegerArray = ^TIntegerArray;
TIntegerArray = array[0..(MAXINT div SizeOf(Integer))-1] of Integer;
TCustomGrid = class(TWidget)
private
FColCount: Integer;
FRowCount: Integer;
FFixedCols: Integer;
FFixedRows: Integer;
FDefaultColWidth: Integer;
FDefaultRowHeight: Integer;
FGridWidth: Integer;
FGridHeight: Integer;
FFixedWidth: Integer;
FFixedHeight: Integer;
FColWidths, FRowHeights: PIntegerArray;
procedure SetColCount(AColCount: Integer);
procedure SetRowCount(ARowCount: Integer);
procedure SetFixedCols(AFixedCols: Integer);
procedure SetFixedRows(AFixedRows: Integer);
procedure SetDefaultColWidth(AWidth: Integer);
procedure SetDefaultRowHeight(AHeight: Integer);
function GetColWidths(ACol: Integer): Integer;
procedure SetColWidths(ACol, AWidth: Integer);
function GetRowHeights(ARow: Integer): Integer;
procedure SetRowHeights(ARow, AHeight: Integer);
procedure HorzScrollBarScroll(Sender: TObject; var APosition: Integer);
procedure VertScrollBarScroll(Sender: TObject; var APosition: Integer);
protected
ScrollingSupport: TScrollingSupport;
procedure Paint(Canvas: TFCanvas); override;
function ProcessEvent(Event: TEventObj): Boolean; override;
function DistributeEvent(Event: TEventObj): Boolean; override;
procedure CalcSizes; override;
procedure Resized; override;
procedure ColWidthsChanged; dynamic;
procedure DrawCell(ACanvas: TFCanvas; ACol, ARow: Integer; ARect: TRect; AState: TGridDrawState); virtual; abstract;
procedure RowHeightsChanged; dynamic;
procedure SizeChanged(OldColCount, OldRowCount: Integer); dynamic;
property CanExpandWidth default True;
property CanExpandHeight default True;
property ColCount: Integer read FColCount write SetColCount default 5;
property RowCount: Integer read FRowCount write SetRowCount default 5;
property FixedCols: Integer read FFixedCols write SetFixedCols default 1;
property FixedRows: Integer read FFixedRows write SetFixedRows default 1;
property GridWidth: Integer read FGridWidth;
property GridHeight: Integer read FGridHeight;
property FixedWidth: Integer read FFixedWidth;
property FixedHeight: Integer read FFixedHeight;
property DefaultColWidth: Integer read FDefaultColWidth write SetDefaultColWidth default 64;
property DefaultRowHeight: Integer read FDefaultRowHeight write SetDefaultRowHeight default 24;
property ColWidths[ACol: Integer]: Integer read GetColWidths write SetColWidths;
property RowHeights[ARow: Integer]: Integer read GetRowHeights write SetRowHeights;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
end;
// -------------------------------------------------------------------
// TDrawGrid
// -------------------------------------------------------------------
TDrawCellEvent = procedure(Sender: TObject; ACanvas: TFCanvas;
ACol, ARow: Integer; Rect: TRect; State: TGridDrawState) of object;
TDrawGrid = class(TCustomGrid)
private
FOnDrawCell: TDrawCellEvent;
protected
procedure DrawCell(ACanvas: TFCanvas; ACol, ARow: Integer; ARect: TRect; AState: TGridDrawState); override;
public
function CellRect(ACol, ARow: Integer): TRect;
property ColWidths;
property RowHeights;
published
property CanExpandWidth;
property CanExpandHeight;
property ColCount;
property RowCount;
property FixedCols;
property FixedRows;
property DefaultColWidth;
property DefaultRowHeight;
property OnDrawCell: TDrawCellEvent read FOnDrawCell write FOnDrawCell;
end;
// -------------------------------------------------------------------
// TStringGrid
// -------------------------------------------------------------------
PCells = ^TCells;
TCells = array[0..(1 shl 30) div SizeOf(AnsiString)] of AnsiString;
TStringGrid = class(TDrawGrid)
private
CellStrings: PCells;
function GetCells(ACol, ARow: Integer): String;
procedure SetCells(ACol, ARow: Integer; const AValue: String);
protected
//function GetEditText(ACol, ARow: Integer): String; override;
//procedure SetEditText(ACol, ARow: Integer; const AValue: String); override;
procedure SizeChanged(OldColCount, OldRowCount: Integer); override;
//procedure ColumnMoved(AFrom, ATo: Integer); override;
//procedure RowMoved(AFrom, ATo: Integer); override;
procedure DrawCell(ACanvas: TFCanvas; ACol, ARow: Integer; ARect: TRect; AState: TGridDrawState); override;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
property Cells[ACol, ARow: Integer]: String read GetCells write SetCells;
property Cols[Index: Integer]: TStrings;
property Objects[ACol, ARow: Integer]: TObject;
property Rows[Index: Integer]: TStrings;
end;
{$ENDIF read_interface}
{$IFDEF read_implementation}
resourcestring
SGridIndexOutOfRange = 'Grid index out of range';
// ===================================================================
// TCustomGrid
// ===================================================================
// public methods
constructor TCustomGrid.Create(AOwner: TComponent);
var
i: Integer;
begin
inherited Create(AOwner);
WidgetStyle := WidgetStyle + [wsOpaque];
FCanExpandWidth := True;
FCanExpandHeight := True;
ScrollingSupport := TScrollingSupport.Create(Self);
ScrollingSupport.HorzScrollBar.OnScroll := @HorzScrollBarScroll;
ScrollingSupport.VertScrollBar.OnScroll := @VertScrollBarScroll;
FDefaultColWidth := 64;
FDefaultRowHeight := 24;
FColCount := 5;
FRowCount := 5;
FFixedCols := 1;
FFixedRows := 1;
GetMem(FColWidths, FColCount * SizeOf(Integer));
GetMem(FRowHeights, FRowCount * SizeOf(Integer));
for i := 0 to 4 do
begin
FColWidths^[i] := FDefaultColWidth;
FRowHeights^[i] := FDefaultRowHeight;
end;
ColWidthsChanged;
RowHeightsChanged;
end;
destructor TCustomGrid.Destroy;
begin
FreeMem(FRowHeights);
FreeMem(FColWidths);
ScrollingSupport.Free;
inherited Destroy;
end;
// protected methods
procedure TCustomGrid.Paint(Canvas: TFCanvas);
var
x1, y1, x2, y2, x, y, Sum: Integer;
CellRect: TRect;
GridDrawState: TGridDrawState;
begin
if not Canvas.IntersectClipRect(ScrollingSupport.ClientRect) then
exit;
with Canvas.GetClipRect do
begin
x1 := Left;
y1 := Top;
x2 := Right;
y2 := Bottom;
end;
{ Initialize these for the case that the cell drawing loop won't get
executed at all: }
CellRect.Left := 0;
CellRect.Right := 0;
// Draw the cells
CellRect.Top := ScrollingSupport.ClientRect.Top;
y := 0;
while y < RowCount do
begin
CellRect.Bottom := CellRect.Top + RowHeights[y];
if CellRect.Bottom > y1 then
begin
CellRect.Left := ScrollingSupport.ClientRect.Left;
x := 0;
while x < ColCount do
begin
CellRect.Right := CellRect.Left + ColWidths[x];
if CellRect.Right > x1 then
begin
GridDrawState := [];
if (x < FixedCols) or (y < FixedRows) then
Include(GridDrawState, gdFixed);
Canvas.SaveState;
if gdFixed in GridDrawState then
begin
with CellRect do
Style.DrawButtonFace(Canvas,
Rect(Left, Top, Right + 1, Bottom + 1), []);
Style.SetUIColor(Canvas, clBtnText);
end else
begin
Style.SetUIColor(Canvas, clWindow);
Canvas.FillRect(CellRect);
Style.SetUIColor(Canvas, clWindowText);
end;
DrawCell(Canvas, x, y, CellRect, GridDrawState);
Canvas.RestoreState;
end;
CellRect.Left := CellRect.Right + 1;
if CellRect.Left >= x2 then
break;
Inc(x);
if x = FixedRows then
Inc(x, ScrollingSupport.HorzScrollBar.Position);
end;
end;
CellRect.Top := CellRect.Bottom + 1;
if CellRect.Top >= y2 then
break;
Inc(y);
if y = FixedRows then
Inc(y, ScrollingSupport.VertScrollBar.Position);
end;
// Draw the grid lines
Style.SetUIColor(Canvas, cl3DFace);
y := 0;
Sum := ScrollingSupport.ClientRect.Top;
while y < RowCount do
begin
Inc(Sum, RowHeights[y]);
if (y >= FixedRows) and (Sum >= y1) then
Canvas.DrawLine(Point(ScrollingSupport.ClientRect.Left + FixedWidth, Sum),
Point(CellRect.Right + 1, Sum));
Inc(Sum);
if Sum >= y2 then
break;
Inc(y);
if y = FixedRows then
Inc(y, ScrollingSupport.VertScrollBar.Position);
end;
x := 0;
Sum := ScrollingSupport.ClientRect.Left;
while x < ColCount do
begin
Inc(Sum, ColWidths[x]);
if (x >= FixedCols) and (Sum >= x1) then
Canvas.DrawLine(Point(Sum, ScrollingSupport.ClientRect.Top + FixedHeight),
Point(Sum, CellRect.Bottom));
Inc(Sum);
if Sum >= x2 then
break;
Inc(x);
if x = FixedCols then
Inc(x, ScrollingSupport.HorzScrollBar.Position);
end;
// Clear the empty space right and below the grid itself
Style.SetUIColor(Canvas, clWindow);
if CellRect.Right + 1 < x2 then
Canvas.FillRect(Rect(CellRect.Right + 1, y1, x2, y2));
if CellRect.Bottom + 1 < y2 then
Canvas.FillRect(Rect(x1, CellRect.Top, CellRect.Right + 1, y2));
end;
function TCustomGrid.ProcessEvent(Event: TEventObj): Boolean;
begin
Result := ScrollingSupport.ProcessEvent(Event) or
inherited ProcessEvent(Event);
end;
function TCustomGrid.DistributeEvent(Event: TEventObj): Boolean;
begin
Result := ScrollingSupport.DistributeEvent(Event) or
inherited DistributeEvent(Event);
end;
procedure TCustomGrid.CalcSizes;
begin
ScrollingSupport.CalcSizes;
end;
procedure TCustomGrid.Resized;
begin
ScrollingSupport.Resized;
end;
procedure TCustomGrid.ColWidthsChanged;
var
i: Integer;
begin
FGridWidth := 0;
for i := 0 to ColCount - 1 do
Inc(FGridWidth, ColWidths[i] + 1);
if FGridWidth > 0 then
Dec(FGridWidth);
FFixedWidth := 0;
for i := 0 to FixedCols - 1 do
Inc(FFixedWidth, ColWidths[i] + 1);
if FFixedWidth > 0 then
Dec(FFixedWidth);
end;
procedure TCustomGrid.RowHeightsChanged;
var
i: Integer;
begin
FGridHeight := 0;
for i := 0 to RowCount - 1 do
Inc(FGridHeight, RowHeights[i] + 1);
if FGridHeight > 0 then
Dec(FGridHeight);
FFixedHeight := 0;
for i := 0 to FixedRows - 1 do
Inc(FFixedHeight, RowHeights[i] + 1);
if FFixedHeight > 0 then
Dec(FFixedHeight);
end;
procedure TCustomGrid.SizeChanged(OldColCount, OldRowCount: Integer);
begin
// This dynamic method is only used for descendants of TCustomGrid
end;
// private methods
procedure TCustomGrid.SetColCount(AColCount: Integer);
var
OldColCount, i: Integer;
begin
if AColCount <> FColCount then
begin
OldColCount := FColCount;
FColCount := AColCount;
ReallocMem(FColWidths, FColCount * SizeOf(Integer));
for i := OldColCount to FColCount - 1 do
FColWidths^[i] := FDefaultColWidth;
ScrollingSupport.HorzScrollBar.Max := ColCount - FixedCols - 1;
ColWidthsChanged;
SizeChanged(OldColCount, FRowCount);
end;
end;
procedure TCustomGrid.SetRowCount(ARowCount: Integer);
var
OldRowCount, i: Integer;
begin
if ARowCount <> FRowCount then
begin
OldRowCount := FRowCount;
FRowCount := ARowCount;
ReallocMem(FRowHeights, FRowCount * SizeOf(Integer));
for i := OldRowCount to FRowCount - 1 do
FRowHeights^[i] := FDefaultRowHeight;
ScrollingSupport.VertScrollBar.Max := RowCount - FixedRows - 1;
RowHeightsChanged;
SizeChanged(FColCount, OldRowCount);
end;
end;
procedure TCustomGrid.SetFixedCols(AFixedCols: Integer);
begin
if AFixedCols <> FixedCols then
begin
FFixedCols := AFixedCols;
ScrollingSupport.HorzScrollBar.Max := ColCount - FixedCols - 1;
end;
end;
procedure TCustomGrid.SetFixedRows(AFixedRows: Integer);
begin
if AFixedRows <> FixedRows then
begin
FFixedRows := AFixedRows;
ScrollingSupport.VertScrollBar.Max := RowCount - FixedRows - 1;
end;
end;
procedure TCustomGrid.SetDefaultColWidth(AWidth: Integer);
var
i: Integer;
begin
if AWidth <> FDefaultColWidth then
begin
FDefaultColWidth := AWidth;
for i := 0 to FColCount - 1 do
FColWidths^[i] := AWidth;
ColWidthsChanged;
end;
end;
procedure TCustomGrid.SetDefaultRowHeight(AHeight: Integer);
var
i: Integer;
begin
if AHeight <> FDefaultRowHeight then
begin
FDefaultRowHeight := AHeight;
for i := 0 to FRowCount - 1 do
FRowHeights^[i] := AHeight;
RowHeightsChanged;
end;
end;
function TCustomGrid.GetColWidths(ACol: Integer): Integer;
begin
if (ACol < 0) or (ACol >= FColCount) then
raise EInvalidGridOperation(SGridIndexOutOfRange);
Result := FColWidths^[ACol];
end;
procedure TCustomGrid.SetColWidths(ACol, AWidth: Integer);
begin
if (ACol < 0) or (ACol >= FColCount) then
raise EInvalidGridOperation(SGridIndexOutOfRange);
FColWidths^[ACol] := AWidth;
end;
function TCustomGrid.GetRowHeights(ARow: Integer): Integer;
begin
if (ARow < 0) or (ARow >= FRowCount) then
raise EInvalidGridOperation(SGridIndexOutOfRange);
Result := FRowHeights^[ARow];
end;
procedure TCustomGrid.SetRowHeights(ARow, AHeight: Integer);
begin
if (ARow < 0) or (ARow >= FRowCount) then
raise EInvalidGridOperation(SGridIndexOutOfRange);
FRowHeights^[ARow] := AHeight;
end;
procedure TCustomGrid.HorzScrollBarScroll(Sender: TObject;
var APosition: Integer);
var
i, Delta: Integer;
r: TRect;
begin
Delta := 0;
if APosition > ScrollingSupport.HorzScrollBar.Position then
for i := ScrollingSupport.HorzScrollBar.Position to APosition - 1 do
Dec(Delta, ColWidths[i + FixedCols] + 1)
else
for i := APosition to ScrollingSupport.HorzScrollBar.Position - 1 do
Inc(Delta, ColWidths[i + FixedCols] + 1);
// Scroll the horizontal fixed cells
r := ScrollingSupport.ClientRect;
Inc(r.Left, FixedWidth + 1);
if r.Left <= r.Right then
begin
if Delta < 0 then // Scrolling to the right side
Dec(r.Left, Delta)
else // Scrolling to the left side
Dec(r.Right, Delta);
Scroll(r, Delta, 0);
end;
end;
procedure TCustomGrid.VertScrollBarScroll(Sender: TObject;
var APosition: Integer);
var
i, Delta: Integer;
r: TRect;
begin
Delta := 0;
if APosition > ScrollingSupport.VertScrollBar.Position then
for i := ScrollingSupport.VertScrollBar.Position to APosition - 1 do
Dec(Delta, RowHeights[i + FixedRows] + 1)
else
for i := APosition to ScrollingSupport.VertScrollBar.Position - 1 do
Inc(Delta, RowHeights[i + FixedRows] + 1);
// Scroll the grid body
r := ScrollingSupport.ClientRect;
Inc(r.Top, FixedHeight + 1);
if r.Top <= r.Bottom then
begin
if Delta < 0 then // Scrolling downwards
Dec(r.Top, Delta)
else // Scrolling upwards
Dec(r.Bottom, Delta);
Scroll(r, 0, Delta);
end;
end;
// -------------------------------------------------------------------
// TDrawGrid
// -------------------------------------------------------------------
procedure TDrawGrid.DrawCell(ACanvas: TFCanvas; ACol, ARow: Integer;
ARect: TRect;
AState: TGridDrawState);
begin
if Assigned(OnDrawCell) then
OnDrawCell(Self, ACanvas, ACol, ARow, ARect, AState);
end;
function TDrawGrid.CellRect(ACol, ARow: Integer): TRect;
var
i: Integer;
begin
Result.Left := 0;
for i := 0 to ACol - 1 do
Inc(Result.Left, ColWidths[i]);
Result.Right := Result.Left + ColWidths[ACol];
Result.Top := 0;
for i := 0 to ARow - 1 do
Inc(Result.Top, RowHeights[i]);
Result.Bottom := Result.Top + RowHeights[ARow];
end;
// -------------------------------------------------------------------
// TStringGrid
// -------------------------------------------------------------------
function TStringGrid.GetCells(ACol, ARow: Integer): String;
begin
if (ACol >= 0) and (ARow >= 0) and (ACol < ColCount) and (ARow < RowCount) then
Result := CellStrings^[ARow * ColCount + ACol]
else
SetLength(Result, 0);
end;
procedure TStringGrid.SetCells(ACol, ARow: Integer; const AValue: String);
begin
if (ACol >= 0) and (ARow >= 0) and (ACol < ColCount) and (ARow < RowCount) then
CellStrings^[ARow * ColCount + ACol] := AValue;
end;
procedure TStringGrid.SizeChanged(OldColCount, OldRowCount: Integer);
var
Count: Integer;
begin
inherited SizeChanged(OldColCount, OldRowCount);
ReallocMem(CellStrings, ColCount * RowCount * SizeOf(AnsiString));
Count := ColCount * RowCount - OldColCount * OldRowCount;
if Count > 0 then
FillChar(CellStrings^[OldColCount * OldRowCount],
Count * SizeOf(AnsiString), #0);
end;
procedure TStringGrid.DrawCell(ACanvas: TFCanvas; ACol, ARow: Integer;
ARect: TRect;
AState: TGridDrawState);
var
s: String;
begin
// WriteLn('TStringGrid.DrawCell(', ACol, ', ', ARow, ', ', Integer(AState), ');');
s := Cells[ACol, ARow];
if Length(s) > 0 then
ACanvas.TextOut(ARect.TopLeft + Point(2, 2), s);
if Assigned(OnDrawCell) then
OnDrawCell(Self, ACanvas, ACol, ARow, ARect, AState);
end;
constructor TStringGrid.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
Self.SizeChanged(0, 0);
end;
destructor TStringGrid.Destroy;
var
i: Integer;
begin
for i := 0 to RowCount * ColCount - 1 do
CellStrings^[i] := '';
FreeMem(CellStrings);
inherited Destroy;
end;
{$ENDIF read_implementation}
|