Add GUI polymorphic example project

polymorphic class/mainform.lfm

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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

polymorphic class/person.pas

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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.
+

polymorphic class/polymorphic.lpi

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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>

polymorphic class/polymorphic.lpr

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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.
+

polymorphic class/unitmain.pas

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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.
+