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{
fpGUI - Free Pascal GUI Toolkit
Copyright (C) 2006 - 2008 See the file AUTHORS.txt, included in this
distribution, for details of the copyright.
See the file COPYING.modifiedLGPL, included in this distribution,
for details about redistributing fpGUI.
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.
Description:
Defines a component for a progress bar.
}
unit gui_progressbar;
{$mode objfpc}{$H+}
interface
uses
Classes,
SysUtils,
gfxbase,
fpgfx,
gfx_widget;
type
TfpgCustomProgressBar = class(TfpgWidget)
private
FMax: longint;
FMin: longint;
FPosition: longint;
FShowCaption: boolean;
FStep: longint;
FFont: TfpgFont;
procedure SetMax(const AValue: longint);
procedure SetMin(const AValue: longint);
procedure SetPBPosition(const AValue: longint);
procedure SetShowCaption(const AValue: boolean);
procedure SetStep(const AValue: longint);
protected
procedure HandlePaint; override;
property Max: longint read FMax write SetMax default 100;
property Min: longint read FMin write SetMin default 0;
property Position: longint read FPosition write SetPBPosition default 0;
property Step: longint read FStep write SetStep;
// property FontName: string read GetFontName write SetFontName;
property ShowCaption: boolean read FShowCaption write SetShowCaption default False;
public
constructor Create(AOwner: TComponent); override;
procedure StepIt;
procedure StepBy(AStep: integer);
property Font: TfpgFont read FFont;
end;
TfpgProgressBar = class(TfpgCustomProgressBar)
published
property BackgroundColor default $c4c4c4;
property ShowCaption;
property Max;
property Min;
property ParentShowHint;
property Position;
property ShowHint;
property Step;
property TextColor;
end;
implementation
{ TfpgCustomProgressBar }
procedure TfpgCustomProgressBar.SetMax(const AValue: longint);
begin
if FMax = AValue then
Exit; //==>
// correct wrong inputs
if FMin > AValue then
FMin := AValue - 1;
if FPosition > AValue then
FPosition := AValue;
FMax := AValue;
RePaint;
end;
procedure TfpgCustomProgressBar.SetMin(const AValue: longint);
begin
if FMin = AValue then
Exit; //==>
// correct wrong inputs
if AValue > FPosition then
FPosition := AValue;
if AValue > FMax then
FMax := AValue+1;
FMin := AValue;
RePaint;
end;
procedure TfpgCustomProgressBar.SetPBPosition(const AValue: longint);
begin
if FPosition = AValue then
Exit; //==>
// correct limits
if AValue < Min then
FPosition := Min
else if AValue > Max then
FPosition := Max
else
FPosition := AValue;
RePaint;
end;
procedure TfpgCustomProgressBar.SetShowCaption(const AValue: boolean);
begin
if FShowCaption = AValue then
Exit; //==>
FShowCaption := AValue;
RePaint;
end;
procedure TfpgCustomProgressBar.SetStep(const AValue: longint);
begin
if AValue < 1 then
Exit; //==>
if FStep = AValue then
Exit; //==>
FStep := AValue;
end;
procedure TfpgCustomProgressBar.HandlePaint;
var
r: TfpgRect;
diff: integer;
aPos: integer; // absolute position
pos: integer;
percent: integer;
txt: string;
x: TfpgCoord;
y: TfpgCoord;
begin
inherited HandlePaint;
Canvas.ClearClipRect;
r.SetRect(0, 0, Width, Height);
Canvas.Clear(BackgroundColor);
// Canvas.SetColor(clInactiveWgFrame);
// calculate position
diff := Max - Min; // diff..
aPos := Position - Min; // absolute position
percent := round(((100 / diff) * aPos));
txt := IntToStr(percent) + '%';
pos := round(percent * (Width-2) / 100);
// Bluecurve theme :)
// outer dark border
Canvas.SetColor(TfpgColor($999999));
Canvas.SetLineStyle(1, lsSolid);
Canvas.DrawRectangle(r);
InflateRect(r, -1, -1);
r.Width := pos;
if FPosition > 0 then
begin
// left top
Canvas.SetColor(TfpgColor($98b2ed));
Canvas.DrawLine(r.Left, r.Bottom, r.Left, r.Top); // left
Canvas.DrawLine(r.Left, r.Top, r.Right, r.Top); // top
// right bottom
Canvas.SetColor(TfpgColor($3b4c71));
Canvas.DrawLine(r.Right, r.Top, r.Right, r.Bottom); // right
Canvas.DrawLine(r.Right, r.Bottom, r.Left, r.Bottom); // bottom
// inside gradient fill
InflateRect(r, -1, -1);
Canvas.GradientFill(r, TfpgColor($425d9b), TfpgColor($97b0e8), gdVertical);
end;
// paint percentage if required
if FShowCaption then
begin
x := (Width - FFont.TextWidth(txt)) div 2;
y := (Height - FFont.Height) div 2;
Canvas.SetTextColor(TextColor);
Canvas.Font := FFont;
Canvas.DrawString(x, y, txt);
end;
end;
constructor TfpgCustomProgressBar.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
Focusable := False;
Width := 150;
Height := 22;
FMin := 0;
FMax := 100;
FStep := 1;
FPosition := 0;
FBackgroundColor := TfpgColor($c4c4c4); // clListBox;
FTextColor := Parent.TextColor;
FShowCaption := False;
FFont := fpgStyle.DefaultFont;
end;
procedure TfpgCustomProgressBar.StepIt;
begin
Position := Position + Step;
end;
procedure TfpgCustomProgressBar.StepBy(AStep: integer);
begin
Position := Position + AStep;
end;
end.
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