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{
fpGUI - Free Pascal GUI Toolkit
Copyright (C) 2006 - 2009 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:
Main window functionality and designer class.
}
unit vfdwidgetclass;
{$mode objfpc}{$H+}
interface
uses
Classes,
SysUtils,
fpg_base,
fpg_main,
fpg_widget,
fpg_menu;
type
TWidgetClass = class of TfpgWidget;
TVFDWidgetProperty = class;
TVFDPropertyEditor = class(TfpgWidget)
private
FProp: TVFDWidgetProperty;
public
OnUpdate: TNotifyEvent;
procedure UpdateProperty(Sender: TObject);
property Prop: TVFDWidgetProperty read FProp;
constructor Create(AOwner: TComponent; aprop: TVFDWidgetProperty); reintroduce;
procedure CreateLayout; virtual;
procedure LoadValue(wg: TfpgWidget); virtual;
procedure StoreValue(wg: TfpgWidget); virtual;
end;
TVFDWidgetProperty = class(TObject)
public
Name: string;
Description: string;
public
constructor Create(aName: string); virtual;
function ParseSourceLine(wg: TfpgWidget; const line: string): boolean; virtual;
function GetPropertySource(wg: TfpgWidget; const ident: string): string; virtual;
function GetValueText(wg: TfpgWidget): string; virtual;
procedure DrawValue(wg: TfpgWidget; Canvas: TfpgCanvas; rect: TfpgRect; flags: integer); virtual;
function CreateEditor(AOwner: TComponent): TVFDPropertyEditor; virtual;
procedure OnExternalEdit(wg: TfpgWidget); virtual;
end;
TVFDPropertyClass = class of TVFDWidgetProperty;
TVFDWidgetClass = class(TObject)
private
FProps: TList;
public
WidgetClass: TWidgetClass;
Description: string;
WidgetIconName: string;
NameBase: string;
Container: boolean;
BlockMouseMsg: boolean;
constructor Create(aClass: TWidgetClass);
destructor Destroy; override;
function AddProperty(apropname: string; apropclass: TVFDPropertyClass; desc: string): TVFDWidgetProperty;
function PropertyCount: integer;
function GetProperty(ind: integer): TVFDWidgetProperty;
function CreateWidget(AOwner: TComponent): TfpgWidget;
function CreatePopupMenu(AWidget: TfpgWidget): TfpgPopupMenu; virtual;
end;
implementation
uses
TypInfo;
type
// used to get to SetDesigning() in Form Designer
TComponentFriendClass = class(TComponent);
{ TVFDWidgetClass }
function TVFDWidgetClass.AddProperty(apropname: string; apropclass: TVFDPropertyClass;
desc: string): TVFDWidgetProperty;
begin
Result := apropclass.Create(apropname);
Result.Description := desc;
FProps.Add(Result);
end;
constructor TVFDWidgetClass.Create(aClass: TWidgetClass);
begin
WidgetClass := aClass;
FProps := TList.Create;
Description := '';
NameBase := 'Widget';
Container := False;
BlockMouseMsg := True;
end;
function TVFDWidgetClass.CreateWidget(AOwner: TComponent): TfpgWidget;
begin
Result := WidgetClass.Create(AOwner);
TComponentFriendClass(Result).SetDesigning(True);
end;
function TVFDWidgetClass.CreatePopupMenu(AWidget: TfpgWidget): TfpgPopupMenu;
begin
{ descendant classed can implement this as needed }
Result := nil;
end;
destructor TVFDWidgetClass.Destroy;
var
n: integer;
begin
for n := 0 to FProps.Count - 1 do
TVFDWidgetProperty(FProps[n]).Free;
FProps.Free;
inherited;
end;
function TVFDWidgetClass.GetProperty(ind: integer): TVFDWidgetProperty;
begin
Result := TVFDWidgetProperty(FProps[ind]);
end;
function TVFDWidgetClass.PropertyCount: integer;
begin
Result := FProps.Count;
end;
{ TVFDWidgetProperty }
constructor TVFDWidgetProperty.Create(aName: string);
begin
Name := aName;
Description := '';
end;
function TVFDWidgetProperty.GetPropertySource(wg: TfpgWidget; const ident: string): string;
begin
end;
function TVFDWidgetProperty.ParseSourceLine(wg: TfpgWidget; const line: string): boolean;
begin
Result := False;
end;
function TVFDWidgetProperty.CreateEditor(AOwner: TComponent): TVFDPropertyEditor;
begin
Result := nil;
end;
procedure TVFDWidgetProperty.DrawValue(wg: TfpgWidget; Canvas: TfpgCanvas; rect: TfpgRect; flags: integer);
var
x, y, fy: integer;
s: string;
begin
x := rect.left;
y := rect.top;
fy := y + rect.Height div 2 - Canvas.Font.Height div 2;
try
s := GetValueText(wg);
except
on E: Exception do
writeln('Detected a error: ', E.Message);
end;
Canvas.BeginDraw;
Canvas.DrawString(x + 1, fy, s);
Canvas.EndDraw;
end;
function TVFDWidgetProperty.GetValueText(wg: TfpgWidget): string;
begin
Result := '[' + Name + ']';
end;
procedure TVFDWidgetProperty.OnExternalEdit(wg: TfpgWidget);
begin
writeln('external edit');
end;
{ TVFDPropertyEditor }
constructor TVFDPropertyEditor.Create(AOwner: TComponent; aprop: TVFDWidgetProperty);
begin
inherited Create(AOwner);
OnUpdate := nil;
FProp := aprop;
end;
procedure TVFDPropertyEditor.CreateLayout;
begin
//abstract
end;
procedure TVFDPropertyEditor.LoadValue(wg: TfpgWidget);
begin
Writeln('abstract: editor.LoadValue');
end;
procedure TVFDPropertyEditor.UpdateProperty(Sender: TObject);
begin
if Assigned(OnUpdate) then
OnUpdate(self);
end;
procedure TVFDPropertyEditor.StoreValue(wg: TfpgWidget);
begin
Writeln('abstract: editor.StoreValue');
// check property type
// the property must be published !
// PPropInfo := GetPropInfo(object, 'propname');
// if PPropInfo^.PropType^.name =
end;
end.
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