5 files changed, 312 insertions, 0 deletions
diff --git a/examples/gui/command_interface/commands.pas b/examples/gui/command_interface/commands.pas
new file mode 100644
index 00000000..2824a04d
--- /dev/null
+++ b/examples/gui/command_interface/commands.pas
@@ -0,0 +1,90 @@
+{
+  Here we define some commands that can be reused throughout a application.
+  Command actions are kept separate from the UI code (Forms).
+}
+unit commands;
+
+{$mode objfpc}{$H+}
+{$INTERFACES CORBA}
+
+interface
+
+uses
+  gfx_command_intf,
+  gui_memo;
+  
+type
+  // non reference counted interface
+  TNullInterfacedObject = class(TObject)
+  protected
+    function QueryInterface(const IID: TGUID; out Obj): longint; stdcall;
+    function _AddRef: longint; stdcall;
+    function _Release: longint; stdcall;
+  end;
+
+
+  TAddCommand = class(TInterfacedObject, ICommand)
+  private
+    FMemo: TfpgMemo;
+  public
+    constructor Create(AMemo: TfpgMemo); reintroduce;
+    procedure   Execute;
+  end;
+
+
+  TExitCommand = class(TInterfacedObject, ICommand)
+  public
+    procedure   Execute;
+  end;
+
+
+implementation
+
+uses
+  fpgfx, SysUtils;
+
+{ TNullInterfacedObject }
+
+function TNullInterfacedObject.QueryInterface(const IID: TGUID; out Obj): longint; stdcall;
+begin
+  if GetInterface(IID, Obj) then
+    Result := 0
+  else
+    result := integer(e_nointerface);
+end;
+
+function TNullInterfacedObject._AddRef: longint; stdcall;
+begin
+  Result := -1;
+end;
+
+function TNullInterfacedObject._Release: longint; stdcall;
+begin
+  Result := -1;
+end;
+
+{ TAddCommand }
+
+constructor TAddCommand.Create(AMemo: TfpgMemo);
+begin
+  inherited Create;
+  FMemo := AMemo;
+end;
+
+procedure TAddCommand.Execute;
+begin
+  Writeln('>> TAddComand.Execute');
+  FMemo.Lines.Add('Hello ' + IntToStr(Random(500)));
+  FMemo.Invalidate;
+end;
+
+{ TExitCommand }
+
+procedure TExitCommand.Execute;
+begin
+  Writeln('>> TExitComand.Execute');
+  fpgApplication.Terminated := True;
+end;
+
+end.
+
diff --git a/examples/gui/command_interface/extrafpc.cfg b/examples/gui/command_interface/extrafpc.cfg
new file mode 100644
index 00000000..073dc4b6
--- /dev/null
+++ b/examples/gui/command_interface/extrafpc.cfg
@@ -0,0 +1,5 @@
+-FUunits
+-Fu../../../lib
+-Xs
+-XX
+-CX
diff --git a/examples/gui/command_interface/frm_main.pas b/examples/gui/command_interface/frm_main.pas
new file mode 100644
index 00000000..28bb18cf
--- /dev/null
+++ b/examples/gui/command_interface/frm_main.pas
@@ -0,0 +1,124 @@
+{
+  This demonstrates the usage of ICommand and ICommandHolder. They work
+  similar to Delphi's TAction classes
+}
+unit frm_main;
+
+{$mode objfpc}{$H+}
+
+interface
+
+uses
+  SysUtils, Classes, gfxbase, fpgfx, gui_edit, 
+  gfx_widget, gui_form, gui_label, gui_button,
+  gui_listbox, gui_memo, gui_combobox, gui_grid, 
+  gui_dialogs, gui_checkbox, gui_tree, gui_trackbar, 
+  gui_progressbar, gui_radiobutton, gui_tab, gui_menu,
+  gui_bevel;
+
+type
+
+  TMainForm = class(TfpgForm)
+  private
+    procedure CommandHandler(Sender: TObject);
+  public
+    {@VFD_HEAD_BEGIN: MainForm}
+    btnAdd: TfpgButton;
+    memName1: TfpgMemo;
+    btnQuit: TfpgButton;
+    MainMenu: TfpgMenuBar;
+    mnuFile: TfpgPopupMenu;
+    {@VFD_HEAD_END: MainForm}
+    procedure AfterCreate; override;
+  end;
+
+{@VFD_NEWFORM_DECL}
+
+implementation
+
+uses
+  gfx_command_intf,
+  commands;
+
+{@VFD_NEWFORM_IMPL}
+
+{ A single event handler that handles all Command based events. }
+procedure TMainForm.CommandHandler(Sender: TObject);
+var
+  cmd: ICommand;
+  holder: ICommandHolder;
+begin
+  if Supports(Sender, ICommandHolder, holder) then
+  begin
+    cmd := holder.GetCommand;
+    cmd.Execute;
+  end;
+end;
+
+procedure TMainForm.AfterCreate;
+begin
+  {@VFD_BODY_BEGIN: MainForm}
+  Name := 'MainForm';
+  SetPosition(293, 236, 284, 254);
+  WindowTitle := 'Command Interface Test';
+  WindowPosition := wpScreenCenter;
+
+  btnAdd := TfpgButton.Create(self);
+  with btnAdd do
+  begin
+    Name := 'btnAdd';
+    SetPosition(204, 36, 75, 24);
+    Text := 'Add';
+    FontDesc := '#Label1';
+    ImageName := '';
+    OnClick := @CommandHandler;
+  end;
+
+  memName1 := TfpgMemo.Create(self);
+  with memName1 do
+  begin
+    Name := 'memName1';
+    SetPosition(8, 36, 188, 208);
+    FontDesc := '#Edit1';
+  end;
+
+  btnQuit := TfpgButton.Create(self);
+  with btnQuit do
+  begin
+    Name := 'btnQuit';
+    SetPosition(204, 220, 75, 24);
+    Text := 'Quit';
+    FontDesc := '#Label1';
+    ImageName := '';
+    OnClick := @CommandHandler;
+  end;
+
+  MainMenu := TfpgMenuBar.Create(self);
+  with MainMenu do
+  begin
+    Name := 'MainMenu';
+    SetPosition(0, 0, 284, 24);
+    Anchors := [anLeft,anRight,anTop];
+  end;
+
+  mnuFile := TfpgPopupMenu.Create(self);
+  with mnuFile do
+  begin
+    Name := 'mnuFile';
+    SetPosition(44, 72, 120, 20);
+    AddMenuItem('Quit', '', @CommandHandler);
+  end;
+
+  {@VFD_BODY_END: MainForm}
+  
+  MainMenu.AddMenuItem('File', nil).SubMenu := mnuFile;
+
+  // instantiate the Command classes
+  btnAdd.SetCommand(TAddCommand.Create(memName1));
+  btnQuit.SetCommand(TExitCommand.Create);
+  // The menu item File|Quit shares the command of btnQuit
+  mnuFile.MenuItemByName('Quit').SetCommand(btnQuit.GetCommand);
+end;
+
+
+end.
diff --git a/examples/gui/command_interface/test.lpi b/examples/gui/command_interface/test.lpi
new file mode 100644
index 00000000..64acd093
--- /dev/null
+++ b/examples/gui/command_interface/test.lpi
@@ -0,0 +1,61 @@
+<?xml version="1.0"?>
+<CONFIG>
+  <ProjectOptions>
+    <PathDelim Value="/"/>
+    <Version Value="6"/>
+    <General>
+      <Flags>
+        <SaveOnlyProjectUnits Value="True"/>
+      </Flags>
+      <SessionStorage Value="InProjectDir"/>
+      <MainUnit Value="0"/>
+      <IconPath Value="./"/>
+      <TargetFileExt Value=""/>
+    </General>
+    <VersionInfo>
+      <ProjectVersion Value=""/>
+    </VersionInfo>
+    <PublishOptions>
+      <Version Value="2"/>
+      <IncludeFileFilter Value="*.(pas|pp|inc|lfm|lpr|lrs|lpi|lpk|sh|xml)"/>
+      <ExcludeFileFilter Value="*.(bak|ppu|ppw|o|so);*~;backup"/>
+    </PublishOptions>
+    <RunParams>
+      <local>
+        <FormatVersion Value="1"/>
+        <LaunchingApplication PathPlusParams="/usr/X11R6/bin/xterm -T 'Lazarus Run Output' -e $(LazarusDir)/tools/runwait.sh $(TargetCmdLine)"/>
+      </local>
+    </RunParams>
+    <RequiredPackages Count="1">
+      <Item1>
+        <PackageName Value="fpgui_package"/>
+      </Item1>
+    </RequiredPackages>
+    <Units Count="3">
+      <Unit0>
+        <Filename Value="test.lpr"/>
+        <IsPartOfProject Value="True"/>
+        <UnitName Value="test"/>
+      </Unit0>
+      <Unit1>
+        <Filename Value="frm_main.pas"/>
+        <IsPartOfProject Value="True"/>
+        <UnitName Value="frm_main"/>
+      </Unit1>
+      <Unit2>
+        <Filename Value="commands.pas"/>
+        <IsPartOfProject Value="True"/>
+        <UnitName Value="commands"/>
+      </Unit2>
+    </Units>
+  </ProjectOptions>
+  <CompilerOptions>
+    <Version Value="5"/>
+    <CodeGeneration>
+      <Generate Value="Faster"/>
+    </CodeGeneration>
+    <Other>
+      <CompilerPath Value="$(CompPath)"/>
+    </Other>
+  </CompilerOptions>
+</CONFIG>
diff --git a/examples/gui/command_interface/test.lpr b/examples/gui/command_interface/test.lpr
new file mode 100644
index 00000000..663e2e2f
--- /dev/null
+++ b/examples/gui/command_interface/test.lpr
@@ -0,0 +1,32 @@
+program test;
+
+{$mode objfpc}{$H+}
+
+uses
+  {$IFDEF UNIX}{$IFDEF UseCThreads}
+  cthreads,
+  {$ENDIF}{$ENDIF}
+  Classes, fpgfx, gui_form, frm_main, commands, fpgui_package;
+
+
+procedure MainProc;
+var
+  frm: TMainForm;
+begin
+  fpgApplication.Initialize;
+  Randomize;
+  frm := TMainForm.Create(nil);
+  try
+    frm.Show;
+    fpgApplication.Run;
+  finally
+    frm.Free;
+  end;
+end;
+
+begin
+  MainProc;
+end.
+
+
+