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{
Proof of concept one handle per widget GUI.
Graeme Geldenhuys
}
unit gui2Base;
{$mode objfpc}{$H+}
{$Define DEBUG}
interface
uses
Classes
,fpgfx
,GFXBase
;
type
{ TWidget }
TWidget = class(TFWindow)
private
FColor: TGfxColor;
FOnClick: TNotifyEvent;
FOnPainting: TNotifyEvent;
procedure EvOnPaint(Sender: TObject; const Rect: TRect); virtual;
procedure EvOnMousePress(Sender: TObject; AButton: TMouseButton; AShift: TShiftState; const AMousePos: TPoint);
procedure SetColor(const AValue: TGfxColor);
protected
procedure Paint; virtual;
property OnPainting: TNotifyEvent read FOnPainting write FOnPainting;
property OnClick: TNotifyEvent read FOnClick write FOnClick;
property Color: TGfxColor read FColor write SetColor;
public
constructor Create(AParent: TFCustomWindow); overload;
end;
{ TForm }
{$Note Can we get TForm descending from TWidget? Here is too much duplication. }
TForm = class(TFWindow)
private
FColor: TGfxColor;
FOnClick: TNotifyEvent;
FOnPainting: TNotifyEvent;
procedure EvOnPaint(Sender: TObject; const Rect: TRect); virtual;
procedure EvOnMousePress(Sender: TObject; AButton: TMouseButton; AShift: TShiftState; const AMousePos: TPoint);
procedure SetColor(const AValue: TGfxColor);
protected
procedure Paint; virtual;
property OnPainting: TNotifyEvent read FOnPainting write FOnPainting;
property Color: TGfxColor read FColor write SetColor;
public
constructor Create(AParent: TFCustomWindow; AWindowOptions: TGfxWindowOptions); override;
constructor Create; virtual;
property OnClick: TNotifyEvent read FOnClick write FOnClick;
end;
{ TPopupWindow }
{$Note TPopupWindow is still work in progess. }
TPopupWindow = class(TForm)
protected
procedure PopupWindowClick(Sender: TObject);
procedure Paint; override;
public
constructor Create(AParent: TFCustomWindow; AWindowOptions: TGfxWindowOptions); override;
constructor Create; override;
end;
{ TButton }
TButton = class(TWidget)
private
FCaption: string;
procedure EvOnPaint(Sender: TObject; const Rect: TRect); override;
procedure SetCaption(const AValue: string);
protected
procedure Paint; override;
public
constructor Create(AParent: TFCustomWindow; APosition: TPoint); overload;
property Caption: string read FCaption write SetCaption;
published
property OnClick;
end;
{ TLabel }
TLabel = class(TWidget)
private
FCaption: string;
procedure SetCaption(const AValue: string);
protected
procedure Paint; override;
public
constructor Create(AParent: TFCustomWindow; APosition: TPoint); overload;
property Caption: string read FCaption write SetCaption;
end;
implementation
{ TWidget }
procedure TWidget.EvOnPaint(Sender: TObject; const Rect: TRect);
begin
{$IFDEF DEBUG} Writeln(ClassName + '.Paint'); {$ENDIF}
if Assigned(OnPainting) then
OnPainting(self);
Paint;
end;
procedure TWidget.EvOnMousePress(Sender: TObject; AButton: TMouseButton;
AShift: TShiftState; const AMousePos: TPoint);
begin
if AButton = mbLeft then
begin
if Assigned(OnClick) then
OnClick(self);
end;
end;
procedure TWidget.SetColor(const AValue: TGfxColor);
begin
if FColor = AValue then exit;
FColor := AValue;
Paint;
end;
procedure TWidget.Paint;
var
r: TRect;
begin
Canvas.SetColor(FColor);
r.Left := 0;
r.Top := 0;
r.Right := Width;
r.Bottom := Height;
Canvas.FillRect(r);
end;
constructor TWidget.Create(AParent: TFCustomWindow);
begin
inherited Create(AParent, []);
FColor := colLtGray;
OnPaint := @EvOnPaint;
OnMouseReleased := @EvOnMousePress;
Show;
end;
{ TForm }
procedure TForm.EvOnPaint(Sender: TObject; const Rect: TRect);
begin
{$IFDEF DEBUG} Writeln(ClassName + '.Paint'); {$ENDIF}
if Assigned(OnPainting) then
OnPainting(self);
Paint;
end;
procedure TForm.EvOnMousePress(Sender: TObject; AButton: TMouseButton;
AShift: TShiftState; const AMousePos: TPoint);
begin
if AButton = mbLeft then
begin
if Assigned(OnClick) then
OnClick(self);
end;
end;
procedure TForm.SetColor(const AValue: TGfxColor);
begin
if FColor = AValue then exit;
FColor := AValue;
Paint;
end;
procedure TForm.Paint;
var
r: TRect;
begin
{$IFDEF DEBUG} Writeln(ClassName + '.Paint'); {$ENDIF}
Canvas.SetColor(FColor);
r.Left := 0;
r.Top := 0;
r.Right := Width;
r.Bottom := Height;
Canvas.FillRect(r);
end;
constructor TForm.Create(AParent: TFCustomWindow;
AWindowOptions: TGfxWindowOptions);
begin
inherited Create(AParent, AWindowOptions);
FColor := colWhite;
OnPaint := @EvOnPaint;
end;
constructor TForm.Create;
begin
Create(nil, [woWindow]);
end;
{ TButton }
procedure TButton.EvOnPaint(Sender: TObject; const Rect: TRect);
begin
inherited EvOnPaint(Sender, Rect);
{$IFDEF DEBUG} Writeln(' - Painting ' + Caption); {$ENDIF}
end;
procedure TButton.SetCaption(const AValue: string);
begin
if FCaption=AValue then exit;
FCaption:=AValue;
Paint;
end;
procedure TButton.Paint;
var
Pt: TPoint;
begin
inherited Paint;
Canvas.SetColor(colBlack);
Canvas.DrawRect(Rect(0, 0, Width, Height));
Pt.x := (Width - Canvas.TextWidth(FCaption)) div 2;
Pt.y := (Height - Canvas.FontCellHeight) div 2;
Canvas.TextOut(Pt, FCaption);
end;
constructor TButton.Create(AParent: TFCustomWindow; APosition: TPoint);
begin
inherited Create(AParent);
SetPosition(APosition);
SetClientSize(Size(75, 25));
end;
{ TLabel }
procedure TLabel.SetCaption(const AValue: string);
var
w, h: integer;
begin
if FCaption=AValue then exit;
FCaption := AValue;
Title := FCaption;
w := Canvas.TextWidth(FCaption) + 6;
h := Canvas.FontCellHeight + 4;
SetClientSize(Size(w, h));
Paint;
end;
procedure TLabel.Paint;
begin
// Color := FParent.Canvas.GetColor;
// inherited Paint;
Canvas.SetColor(colWhite);
Canvas.FillRect(Rect(0,0,Width,Height));
Canvas.SetColor(colBlack);
Canvas.TextOut(Point(0, 0), FCaption);
end;
constructor TLabel.Create(AParent: TFCustomWindow; APosition: TPoint);
begin
inherited Create(AParent);
SetPosition(APosition);
SetClientSize(Size(75, 22));
end;
{ TPopupWindow }
procedure TPopupWindow.PopupWindowClick(Sender: TObject);
begin
Writeln(ClassName + '.HandleOnClick');
// GFApplication.Forms.Remove(self);
// Free;
end;
procedure TPopupWindow.Paint;
begin
inherited Paint;
end;
constructor TPopupWindow.Create(AParent: TFCustomWindow;
AWindowOptions: TGfxWindowOptions);
begin
inherited Create(AParent, AWindowOptions);
// SetPosition();
OnClick :=@PopupWindowClick;
end;
constructor TPopupWindow.Create;
begin
// Create(nil, [woPopup]);
Create(nil, [woWindow]);
end;
end.
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