Add basic GUI example

first_gui/first_gui.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="first_gui"/>
+      <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="2">
+      <Unit0>
+        <Filename Value="first_gui.lpr"/>
+        <IsPartOfProject Value="True"/>
+      </Unit0>
+      <Unit1>
+        <Filename Value="umain.pas"/>
+        <IsPartOfProject Value="True"/>
+        <ComponentName Value="Form1"/>
+        <ResourceBaseClass Value="Form"/>
+      </Unit1>
+    </Units>
+  </ProjectOptions>
+  <CompilerOptions>
+    <Version Value="11"/>
+    <Target>
+      <Filename Value="first_gui"/>
+    </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>

first_gui/first_gui.lpr

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+program first_gui;
+
+{$mode objfpc}{$H+}
+
+uses
+	{$IFDEF UNIX}{$IFDEF UseCThreads}
+	cthreads,
+	{$ENDIF}{$ENDIF}
+	Interfaces, // this includes the LCL widgetset
+	Forms, umain
+	{ you can add units after this };
+
+{$R *.res}
+
+begin
+	RequireDerivedFormResource:=True;
+	Application.Title:='first_gui';
+	Application.Initialize;
+	Application.CreateForm(TForm1, Form1);
+	Application.Run;
+end.
+

first_gui/umain.lfm

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+object Form1: TForm1
+  Left = 811
+  Height = 240
+  Top = 410
+  Width = 320
+  BorderIcons = [biSystemMenu]
+  Caption = 'Form1'
+  ClientHeight = 240
+  ClientWidth = 320
+  LCLVersion = '2.0.12.0'
+  object DateBtn: TButton
+    Left = 70
+    Height = 52
+    Top = 94
+    Width = 181
+    Caption = 'Show Date'
+    Font.Style = [fsBold]
+    OnClick = DateBtnClick
+    ParentFont = False
+    TabOrder = 0
+  end
+end

first_gui/umain.pas

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+unit umain;
+
+{$mode objfpc}{$H+}
+
+interface
+
+uses
+	Classes, SysUtils, Forms, Controls, Graphics, Dialogs, StdCtrls;
+
+type
+
+	{ TForm1 }
+
+ TForm1 = class(TForm)
+		DateBtn: TButton;
+		procedure DateBtnClick(Sender: TObject);
+	private
+		function TodayAsString: string;
+	public
+
+	end;
+
+var
+	Form1: TForm1;
+
+implementation
+
+{$R *.lfm}
+
+{ TForm1 }
+
+procedure TForm1.DateBtnClick(Sender: TObject);
+begin
+	ShowMessageFmt('Today is %s', [TodayAsString]);
+end;
+
+function TForm1.TodayAsString: string;
+begin
+	Result := FormatDateTime('dddd, mmm d, yyyy', Now);
+end;
+
+end.