Support using GetTextExtent() with empty string to get descent in wxOSX.

[wxWidgets.git] / samples / minimal / minimal.cpp

diff --git a/samples/minimal/minimal.cpp b/samples/minimal/minimal.cpp
index 24e0dbb9e676ef9a7aa7bf56d66877658233bee0..a78e462908be84bf2a6acba019340414f7ff813c 100644 (file)
--- a/samples/minimal/minimal.cpp
+++ b/samples/minimal/minimal.cpp
@@ -1,30 +1,200 @@
-#include "wx/wx.h"
+/////////////////////////////////////////////////////////////////////////////
+// Name:        minimal.cpp
+// Purpose:     Minimal wxWidgets sample
+// Author:      Julian Smart
+// Modified by:
+// Created:     04/01/98
+// RCS-ID:      $Id$
+// Copyright:   (c) Julian Smart
+// Licence:     wxWindows licence
+/////////////////////////////////////////////////////////////////////////////

 
 

+// ============================================================================
+// declarations
+// ============================================================================

 
 

-class TestApp : public wxApp
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+// For compilers that support precompilation, includes "wx/wx.h".
+#include "wx/wxprec.h"
+
+#ifdef __BORLANDC__
+    #pragma hdrstop
+#endif
+
+// for all others, include the necessary headers (this file is usually all you
+// need because it includes almost all "standard" wxWidgets headers)
+#ifndef WX_PRECOMP
+    #include "wx/wx.h"
+#endif
+
+// ----------------------------------------------------------------------------
+// resources
+// ----------------------------------------------------------------------------
+
+// the application icon (under Windows and OS/2 it is in resources and even
+// though we could still include the XPM here it would be unused)
+#ifndef wxHAS_IMAGES_IN_RESOURCES
+    #include "../sample.xpm"
+#endif
+
+// ----------------------------------------------------------------------------
+// private classes
+// ----------------------------------------------------------------------------
+
+// Define a new application type, each program should derive a class from wxApp
+class MyApp : public wxApp
+{
+public:
+    // override base class virtuals
+    // ----------------------------
+
+    // this one is called on application startup and is a good place for the app
+    // initialization (doing it here and not in the ctor allows to have an error
+    // return: if OnInit() returns false, the application terminates)
+    virtual bool OnInit();
+};
+
+// Define a new frame type: this is going to be our main frame
+class MyFrame : public wxFrame

 {
 public:
 {
 public:

-    virtual bool OnInit() {
-       wxFrame *frame = new wxFrame(NULL, -1, _T("Test"));
-       
-       wxFlexGridSizer *sizer = new wxFlexGridSizer(3, 1, 0, 0);
-       
-       sizer->Add(new wxListBox(frame, -1, wxDefaultPosition, wxSize(200,100)));
-       sizer->Add(new wxButton(frame, -1, _T("Hello")), 0, wxGROW | wxALIGN_RIGHT);
-       sizer->Add(new wxTextCtrl(frame, -1, _T("dummy"), wxDefaultPosition, wxSize(200, 100)) );
-       sizer->AddGrowableRow(0, 1);
-       sizer->AddGrowableRow(1, 1);
-               sizer->AddGrowableRow(2, 1);
-        sizer->AddGrowableCol(0, 1);
-       
-       frame->SetSizer(sizer);
-       sizer->SetSizeHints(frame);
-       
-       frame->Show();
-       SetTopWindow(frame);
-       
-       return true;
-    }
+    // ctor(s)
+    MyFrame(const wxString& title);
+
+    // event handlers (these functions should _not_ be virtual)
+    void OnQuit(wxCommandEvent& event);
+    void OnAbout(wxCommandEvent& event);
+
+private:
+    // any class wishing to process wxWidgets events must use this macro
+    DECLARE_EVENT_TABLE()

 };
 
 };
 

-IMPLEMENT_APP(TestApp)
+// ----------------------------------------------------------------------------
+// constants
+// ----------------------------------------------------------------------------
+
+// IDs for the controls and the menu commands
+enum
+{
+    // menu items
+    Minimal_Quit = wxID_EXIT,
+
+    // it is important for the id corresponding to the "About" command to have
+    // this standard value as otherwise it won't be handled properly under Mac
+    // (where it is special and put into the "Apple" menu)
+    Minimal_About = wxID_ABOUT
+};
+
+// ----------------------------------------------------------------------------
+// event tables and other macros for wxWidgets
+// ----------------------------------------------------------------------------
+
+// the event tables connect the wxWidgets events with the functions (event
+// handlers) which process them. It can be also done at run-time, but for the
+// simple menu events like this the static method is much simpler.
+BEGIN_EVENT_TABLE(MyFrame, wxFrame)
+    EVT_MENU(Minimal_Quit,  MyFrame::OnQuit)
+    EVT_MENU(Minimal_About, MyFrame::OnAbout)
+END_EVENT_TABLE()
+
+// Create a new application object: this macro will allow wxWidgets to create
+// the application object during program execution (it's better than using a
+// static object for many reasons) and also implements the accessor function
+// wxGetApp() which will return the reference of the right type (i.e. MyApp and
+// not wxApp)
+IMPLEMENT_APP(MyApp)
+
+// ============================================================================
+// implementation
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// the application class
+// ----------------------------------------------------------------------------
+
+// 'Main program' equivalent: the program execution "starts" here
+bool MyApp::OnInit()
+{
+    // call the base class initialization method, currently it only parses a
+    // few common command-line options but it could be do more in the future
+    if ( !wxApp::OnInit() )
+        return false;
+
+    // create the main application window
+    MyFrame *frame = new MyFrame("Minimal wxWidgets App");
+
+    // and show it (the frames, unlike simple controls, are not shown when
+    // created initially)
+    frame->Show(true);
+
+    // success: wxApp::OnRun() will be called which will enter the main message
+    // loop and the application will run. If we returned false here, the
+    // application would exit immediately.
+    return true;
+}
+
+// ----------------------------------------------------------------------------
+// main frame
+// ----------------------------------------------------------------------------
+
+// frame constructor
+MyFrame::MyFrame(const wxString& title)
+       : wxFrame(NULL, wxID_ANY, title)
+{
+    // set the frame icon
+    SetIcon(wxICON(sample));
+
+#if wxUSE_MENUS
+    // create a menu bar
+    wxMenu *fileMenu = new wxMenu;
+
+    // the "About" item should be in the help menu
+    wxMenu *helpMenu = new wxMenu;
+    helpMenu->Append(Minimal_About, "&About\tF1", "Show about dialog");
+
+    fileMenu->Append(Minimal_Quit, "E&xit\tAlt-X", "Quit this program");
+
+    // now append the freshly created menu to the menu bar...
+    wxMenuBar *menuBar = new wxMenuBar();
+    menuBar->Append(fileMenu, "&File");
+    menuBar->Append(helpMenu, "&Help");
+
+    // ... and attach this menu bar to the frame
+    SetMenuBar(menuBar);
+#endif // wxUSE_MENUS
+
+#if wxUSE_STATUSBAR
+    // create a status bar just for fun (by default with 1 pane only)
+    CreateStatusBar(2);
+    SetStatusText("Welcome to wxWidgets!");
+#endif // wxUSE_STATUSBAR
+}
+
+
+// event handlers
+
+void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
+{
+    // true is to force the frame to close
+    Close(true);
+}
+
+void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
+{
+    wxMessageBox(wxString::Format
+                 (
+                    "Welcome to %s!\n"
+                    "\n"
+                    "This is the minimal wxWidgets sample\n"
+                    "running under %s.",
+                    wxVERSION_STRING,
+                    wxGetOsDescription()
+                 ),
+                 "About wxWidgets minimal sample",
+                 wxOK | wxICON_INFORMATION,
+                 this);
+}