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{
fpGUI - Free Pascal Graphical User Interface
Copyright (C) 2006 by Graeme Geldenhuys
member of the fpGUI development team.
Progress Bar 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}
{
Progress Bar implementation
}
{$IFDEF read_interface}
{ TCustomProgressBar }
TCustomProgressBar = class(TCustomPanel)
private
FFillColor: TColor;
FMax: integer;
FMin: integer;
FPosition: integer;
FShowPercentage: Boolean;
procedure SetFillColor(const AValue: TColor);
procedure SetMax(const AValue: integer);
procedure SetMin(const AValue: integer);
procedure SetPosition(const AValue: integer);
procedure SetShowPercentage(const AValue: Boolean);
protected
procedure Paint(Canvas: TFCanvas); override;
property FillColor: TColor read FFillColor write SetFillColor default clRed;
property Position: integer read FPosition write SetPosition;
property Min: integer read FMin write SetMin default 0;
property Max: integer read FMax write SetMax default 100;
property ShowPercentage: Boolean read FShowPercentage write SetShowPercentage default True;
public
constructor Create(const pText: string; pOwner: TComponent); overload;
end;
TProgressBar = class(TCustomProgressBar)
published
property CanExpandWidth;
property CanExpandHeight;
property Enabled;
// property Text;
property FillColor;
property Position;
property Min;
property Max;
property ShowPercentage;
end;
{$ENDIF read_interface}
{$IFDEF read_implementation}
procedure TCustomProgressBar.SetFillColor(const AValue: TColor);
begin
if FFillColor = AValue then exit;
FFillColor := AValue;
Redraw;
end;
procedure TCustomProgressBar.SetMax(const AValue: integer);
begin
if FMax = AValue then exit;
FMax := AValue;
if FPosition > FMax then
FPosition := FMax;
Redraw;
end;
procedure TCustomProgressBar.SetMin(const AValue: integer);
begin
if FMin = AValue then exit;
FMin := AValue;
if FPosition < FMin then
FPosition := FMin;
Redraw;
end;
procedure TCustomProgressBar.SetPosition(const AValue: integer);
begin
if FPosition = AValue then
exit; //==>
if (AValue >= Min) and (AValue <= Max) then
begin
FPosition := AValue;
Redraw;
end;
end;
procedure TCustomProgressBar.SetShowPercentage(const AValue: Boolean);
begin
if FShowPercentage = AValue then
Exit; //==>
FShowPercentage := AValue;
Redraw;
end;
procedure TCustomProgressBar.Paint(Canvas: TFCanvas);
var
Pt: TPoint;
r: TRect;
p: integer;
percent: integer;
t: string;
begin
FText := '';
inherited Paint(Canvas);
Canvas.SetColor(Style.GetUIColor(FFillColor));
percent := (100 div (Max - Min)) * FPosition;
p := (percent * (Width - 3)) div 100;
r := Rect(
ClientRect.Left + 3,
ClientRect.Top + 3,
p,
ClientRect.Bottom - 3);
Canvas.FillRect(r);
if FShowPercentage then
begin
t := IntToStr(percent) + '%';
Pt.x := (Width - Canvas.TextWidth(t)) div 2;
Pt.y := (Height - Canvas.FontCellHeight) div 2;
Canvas.SetColor(Style.GetUIColor(clBtnText));
Style.DrawText(Canvas, Pt, t, WidgetState);
end;
end;
constructor TCustomProgressBar.Create(const pText: string; pOwner: TComponent);
begin
inherited Create(pText, pOwner);
FCanExpandHeight := False;
FBevelStyle := bsLowered;
FFillColor := clRed;
FMin := 0;
FMax := 100;
FShowPercentage := True;
end;
{$ENDIF read_implementation}
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