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Add GUI polymorphic example project

This commit is contained in:
Timothy Warren 2021-10-05 15:33:01 -04:00
parent 1c31e8b8c4
commit 53d00c25b1
6 changed files with 253 additions and 0 deletions

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object MainForm: TMainForm
Left = 417
Height = 240
Top = 298
Width = 320
Caption = 'MainForm'
ClientHeight = 240
ClientWidth = 320
OnCreate = FormCreate
LCLVersion = '2.0.12.0'
object rgPeople: TRadioGroup
Left = 16
Height = 185
Top = 16
Width = 281
AutoFill = True
Caption = 'Chose a TPerson Instance'
ChildSizing.LeftRightSpacing = 6
ChildSizing.EnlargeHorizontal = crsHomogenousChildResize
ChildSizing.EnlargeVertical = crsHomogenousChildResize
ChildSizing.ShrinkHorizontal = crsScaleChilds
ChildSizing.ShrinkVertical = crsScaleChilds
ChildSizing.Layout = cclLeftToRightThenTopToBottom
ChildSizing.ControlsPerLine = 1
ClientHeight = 166
ClientWidth = 271
Items.Strings = (
'David Beckham'
'William Shakespeare'
'Mae West'
'Blaise Pascal'
)
OnClick = rgPeopleClick
TabOrder = 0
end
end

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unit person;
{$mode objfpc}{$H+}
interface
uses Dialogs;
type
TPerson = class
procedure Speak; virtual; abstract;
end;
{TBeckham}
TBeckham = class(TPerson)
procedure Speak; override;
end;
{TShakespeare}
TShakespeare = class(TPerson)
procedure Speak; override;
end;
{TWest}
TWest = class(TPerson)
procedure Speak; override;
end;
{TBlaise}
TBlaise = class(TPerson)
procedure Speak; override;
end;
implementation
{TBlaise}
procedure TBlaise.Speak;
begin
ShowMessage('Le coeur a ses raisons que la raison ne connait point');
end;
{TWest}
procedure TWest.Speak;
begin
ShowMessage('I used to be Snow White... but I drifted');
end;
{TShakespeare}
procedure TShakespeare.Speak;
begin
ShowMessage('The robbed that smiles steals something from the thief');
end;
{TBeckham}
procedure TBeckham.Speak;
begin
ShowMessage('I''ve got more clothes than Victoria!');
end;
end.

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<?xml version="1.0" encoding="UTF-8"?>
<CONFIG>
<ProjectOptions>
<Version Value="11"/>
<General>
<SessionStorage Value="InProjectDir"/>
<MainUnit Value="0"/>
<Title Value="polymorphic"/>
<Scaled Value="True"/>
<ResourceType Value="res"/>
<UseXPManifest Value="True"/>
<XPManifest>
<DpiAware Value="True"/>
</XPManifest>
<Icon Value="0"/>
</General>
<BuildModes Count="1">
<Item1 Name="Default" Default="True"/>
</BuildModes>
<PublishOptions>
<Version Value="2"/>
<UseFileFilters Value="True"/>
</PublishOptions>
<RunParams>
<FormatVersion Value="2"/>
<Modes Count="0"/>
</RunParams>
<RequiredPackages Count="1">
<Item1>
<PackageName Value="LCL"/>
</Item1>
</RequiredPackages>
<Units Count="3">
<Unit0>
<Filename Value="polymorphic.lpr"/>
<IsPartOfProject Value="True"/>
</Unit0>
<Unit1>
<Filename Value="unitmain.pas"/>
<IsPartOfProject Value="True"/>
<ComponentName Value="MainForm"/>
<HasResources Value="True"/>
<ResourceBaseClass Value="Form"/>
</Unit1>
<Unit2>
<Filename Value="person.pas"/>
<IsPartOfProject Value="True"/>
</Unit2>
</Units>
</ProjectOptions>
<CompilerOptions>
<Version Value="11"/>
<Target>
<Filename Value="polymorphic"/>
</Target>
<SearchPaths>
<IncludeFiles Value="$(ProjOutDir)"/>
<UnitOutputDirectory Value="lib/$(TargetCPU)-$(TargetOS)"/>
</SearchPaths>
<Linking>
<Debugging>
<DebugInfoType Value="dsDwarf2Set"/>
</Debugging>
<Options>
<Win32>
<GraphicApplication Value="True"/>
</Win32>
</Options>
</Linking>
</CompilerOptions>
<Debugging>
<Exceptions Count="3">
<Item1>
<Name Value="EAbort"/>
</Item1>
<Item2>
<Name Value="ECodetoolError"/>
</Item2>
<Item3>
<Name Value="EFOpenError"/>
</Item3>
</Exceptions>
</Debugging>
</CONFIG>

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program polymorphic;
{$mode objfpc}{$H+}
uses
{$IFDEF UNIX}{$IFDEF UseCThreads}
cthreads,
{$ENDIF}{$ENDIF}
Interfaces, // this includes the LCL widgetset
Forms, unitmain, person
{ you can add units after this };
{$R *.res}
begin
RequireDerivedFormResource:=True;
Application.Scaled:=True;
Application.Initialize;
Application.CreateForm(TMainForm, Form1);
Application.Run;
end.

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unit unitmain;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, Forms, Controls, Graphics, Dialogs, ExtCtrls, person;
type
{ TMainform }
TMainform = class(TForm)
rgPeople: TRadioGroup;
procedure FormCreate(Sender: TObject);
procedure rgPeopleClick(Sender: TObject);
end;
var
Form1: TMainform;
implementation
{$R mainform.lfm}
{ TMainform }
procedure TMainform.FormCreate(Sender: TObject);
begin
end;
procedure TMainform.rgPeopleClick(Sender: TObject);
var p: TPerson;
begin
if rgPeople.ItemIndex < 0 then Exit;
// Select the appropriate Person
case rgPeople.ItemIndex of
0: p := TBeckham.Create;
1: p := TShakespeare.Create;
2: p := TWest.Create;
3: p := TBlaise.Create;
end;
p.Speak;
p.Free;
end;
end.