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unit frmMain;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, fpg_form, fpg_button, fpg_label, fpg_edit, fpg_trackbar,
fpg_combobox, fpg_memo, Model, tiModelMediator, Model_View;
type
TMainForm = class(TfpgForm)
private
btnClose: TfpgButton;
btnViaCode: TfpgButton;
btnShowModel: TfpgButton;
Label1: TfpgLabel;
Label2: TfpgLabel;
edtName: TfpgEdit;
AgeTrackBar: TfpgTrackBar;
memMemo: TfpgMemo;
cbGender: TfpgComboBox;
Label3: TfpgLabel;
{ The object we will be working with. }
FPerson: TPerson;
{ Form Mediator }
FMediator: TtiModelMediator;
procedure btnCloseClick(Sender: TObject);
procedure btnShowModelClick(Sender: TObject);
procedure btnViaCodeClick(Sender: TObject);
procedure InitializeComponents;
procedure SetupMediators;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure AfterConstruction; override;
end;
implementation
uses
fpg_dialogs
;
{ TMainForm }
procedure TMainForm.btnCloseClick(Sender: TObject);
begin
Close;
end;
procedure TMainForm.btnShowModelClick(Sender: TObject);
begin
ShowMessage(FPerson.AsDebugString);
end;
{ The controls will automatically update as well! }
procedure TMainForm.btnViaCodeClick(Sender: TObject);
begin
FPerson.Name := 'John Doe';
FPerson.Age := 23;
FPerson.Gender := genFemale;
end;
procedure TMainForm.InitializeComponents;
begin
Label1 := TfpgLabel.Create(self);
with Label1 do
begin
Left := 8;
Height := 17;
Top := 16;
Width := 49;
Text := 'Name:';
end;
Label2 := TfpgLabel.Create(self);
with Label2 do
begin
Left := 8;
Height := 17;
Top := 48;
Width := 34;
Text := 'Age:';
end;
Label3 := TfpgLabel.Create(self);
with Label3 do
begin
Left := 264;
Height := 17;
Top := 16;
Width := 90;
Text := '(Read-Only)';
end;
btnClose := TfpgButton.Create(self);
with btnClose do
begin
Left := 416;
Height := 25;
Top := 160;
Width := 75;
Text := 'Close';
OnClick := @btnCloseClick;
ImageName := 'stdimg.Close';
ShowImage := True;
TabOrder := 0;
end;
btnViaCode := TfpgButton.Create(self);
with btnViaCode do
begin
Left := 7;
Height := 25;
Top := 160;
Width := 150;
Text := 'Change via Code';
OnClick := @btnViaCodeClick;
TabOrder := 1;
end;
btnShowModel := TfpgButton.Create(self);
with btnShowModel do
begin
Left := 164;
Height := 25;
Top := 160;
Width := 100;
Text := 'Show Model';
OnClick := @btnShowModelClick;
TabOrder := 2;
end;
edtName := TfpgEdit.Create(self);
with edtName do
begin
Left := 64;
Height := 21;
Top := 16;
Width := 150;
TabOrder := 3;
end;
AgeTrackBar := TfpgTrackBar.Create(self);
with AgeTrackBar do
begin
Left := 64;
Height := 41;
Top := 72;
Width := 150;
Max := 100;
ShowPosition := True;
TabOrder := 5;
end;
memMemo := TfpgMemo.Create(self);
with memMemo do
begin
Left := 264;
Height := 57;
Top := 32;
Width := 185;
TabOrder := 6;
end;
cbGender := TfpgComboBox.Create(self);
with cbGender do
begin
Left := 264;
Height := 21;
Top := 96;
TabOrder := 7;
end;
end;
procedure TMainForm.SetupMediators;
begin
{
FComboBoxGenderMediator := TPerson_Gender_ComboBox_Mediator.CreateCustom(cbGender, FPerson, 'GenderGUI', 'Text');
}
if not Assigned(FMediator) then
begin
FMediator := TtiModelMediator.Create(self);
FMediator.Name := 'DemoFormMediator';
FMediator.AddProperty('Name', edtName);
FMediator.AddProperty('Age', AgeTrackBar);
FMediator.AddProperty('Name', memMemo);
FMediator.AddProperty('GenderGUI', cbGender);
end;
FMediator.Subject := FPerson;
FMediator.Active := True;
end;
constructor TMainForm.Create(AOwner: TComponent);
var
i: TGender;
begin
inherited Create(AOwner);
WindowTitle := 'Edit Mediators Demo';
WindowPosition := wpUser;
SetPosition(100, 100, 500, 200);
{ The Data Object being observed }
FPerson := TPerson.Create;
FPerson.Name := 'Graeme Geldenhuys';
FPerson.Age := 32;
InitializeComponents;
for i := Low(TGender) to High(TGender) do
cbGender.Items.Add(cGender[i]);
end;
destructor TMainForm.Destroy;
begin
// TFormMediator (FMediator) get free'd automatically because it's a TComponent
FPerson.Free;
inherited Destroy;
end;
procedure TMainForm.AfterConstruction;
begin
inherited AfterConstruction;
{ The only trick here is to not let the OnChange events fire
before the mediators are not set up!! }
SetupMediators;
// This will cause all components to update at once
FPerson.NotifyObservers;
end;
end.
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