added sample showing how to use custom renderers and load them from DLL
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@22632 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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Vadim Zeitlin
313
samples/render/render.cpp
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313
samples/render/render.cpp
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/////////////////////////////////////////////////////////////////////////////
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// Name: render.cpp
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// Purpose: Render wxWindows sample
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// Author: Vadim Zeitlin
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// Modified by:
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// Created: 04.08.03
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// RCS-ID: $Id$
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// Copyright: (c) 2003 Vadim Zeitlin <vadim@wxwindows.org>
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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// ============================================================================
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// declarations
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// ============================================================================
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// ----------------------------------------------------------------------------
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// headers
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// ----------------------------------------------------------------------------
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// For compilers that support precompilation, includes "wx/wx.h".
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#include "wx/wxprec.h"
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#ifdef __BORLANDC__
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#pragma hdrstop
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#endif
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#ifndef WX_PRECOMP
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#include "wx/app.h"
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#include "wx/frame.h"
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#endif
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#include "wx/apptrait.h"
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#include "wx/renderer.h"
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// ----------------------------------------------------------------------------
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// resources
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// ----------------------------------------------------------------------------
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// the application icon (under Windows and OS/2 it is in resources)
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#if defined(__WXGTK__) || defined(__WXMOTIF__) || defined(__WXMAC__) || defined(__WXMGL__) || defined(__WXX11__)
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#include "../sample.xpm"
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#endif
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// ----------------------------------------------------------------------------
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// private classes
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// ----------------------------------------------------------------------------
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// A renderer class draws the header buttons in a "special" way
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class MyRenderer : public wxDelegateRendererNative
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{
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public:
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MyRenderer() : wxDelegateRendererNative(wxRendererNative::GetDefault()) { }
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virtual void DrawHeaderButton(wxWindow * WXUNUSED(win),
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wxDC& dc,
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const wxRect& rect,
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int WXUNUSED(flags) = 0)
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{
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dc.SetBrush(*wxBLUE_BRUSH);
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dc.SetTextForeground(*wxWHITE);
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dc.DrawRoundedRectangle(rect, 5);
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dc.DrawLabel(_T("MyRenderer"), wxNullBitmap, rect, wxALIGN_CENTER);
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}
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};
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// To use a different renderer from the very beginning we must override
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// wxAppTraits method creating the renderer (another, simpler, alternative is
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// to call wxRendererNative::Set() a.s.a.p. which should work in 99% of the
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// cases, but we show this here just for completeness)
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class MyTraits : public wxGUIAppTraits
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{
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virtual wxRendererNative *CreateRenderer()
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{
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// it will be deleted on program shutdown by wxWindows itself
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return new MyRenderer;
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}
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};
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// Define a new application type, each program should derive a class from wxApp
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class MyApp : public wxApp
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{
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public:
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virtual bool OnInit();
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// if we want MyTraits to be used we must override CreateTraits()
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virtual wxAppTraits *CreateTraits() { return new MyTraits; }
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};
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// Define a new frame type: this is going to be our main frame
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class MyFrame : public wxFrame
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{
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public:
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// ctor(s)
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MyFrame();
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virtual ~MyFrame();
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// event handlers (these functions should _not_ be virtual)
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void OnLoad(wxCommandEvent& event);
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void OnUnload(wxCommandEvent& event);
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void OnQuit(wxCommandEvent& event);
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void OnAbout(wxCommandEvent& event);
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private:
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wxPanel *m_panel;
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// any class wishing to process wxWindows events must use this macro
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DECLARE_EVENT_TABLE()
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};
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// a very simple class just to have something to draw on
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class MyPanel : public wxPanel
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{
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public:
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MyPanel(wxWindow *parent) : wxPanel(parent) { }
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void OnPaint(wxPaintEvent&)
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{
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wxPaintDC dc(this);
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dc.DrawText(_T("Below is the standard header button drawn"), 10, 10);
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dc.DrawText(_T("using the current renderer:"), 10, 40);
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wxRendererNative::Get().DrawHeaderButton(this, dc,
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wxRect(20, 70, 100, 60));
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}
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DECLARE_EVENT_TABLE()
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};
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BEGIN_EVENT_TABLE(MyPanel, wxPanel)
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EVT_PAINT(MyPanel::OnPaint)
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END_EVENT_TABLE()
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// ----------------------------------------------------------------------------
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// constants
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// ----------------------------------------------------------------------------
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// IDs for the controls and the menu commands
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enum
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{
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// our menu items
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Render_Load = 100,
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Render_Unload,
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// standard menu items
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Render_Quit = wxID_EXIT,
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// it is important for the id corresponding to the "About" command to have
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// this standard value as otherwise it won't be handled properly under Mac
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// (where it is special and put into the "Apple" menu)
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Render_About = wxID_ABOUT
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};
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// ----------------------------------------------------------------------------
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// event tables and other macros for wxWindows
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// ----------------------------------------------------------------------------
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// the event tables connect the wxWindows events with the functions (event
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// handlers) which process them. It can be also done at run-time, but for the
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// simple menu events like this the static method is much simpler.
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BEGIN_EVENT_TABLE(MyFrame, wxFrame)
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EVT_MENU(Render_Load, MyFrame::OnLoad)
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EVT_MENU(Render_Unload,MyFrame::OnUnload)
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EVT_MENU(Render_Quit, MyFrame::OnQuit)
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EVT_MENU(Render_About, MyFrame::OnAbout)
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END_EVENT_TABLE()
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// Create a new application object: this macro will allow wxWindows to create
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// the application object during program execution (it's better than using a
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// static object for many reasons) and also implements the accessor function
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// wxGetApp() which will return the reference of the right type (i.e. MyApp and
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// not wxApp)
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IMPLEMENT_APP(MyApp)
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// ============================================================================
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// implementation
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// ============================================================================
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// ----------------------------------------------------------------------------
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// the application class
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// ----------------------------------------------------------------------------
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// 'Main program' equivalent: the program execution "starts" here
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bool MyApp::OnInit()
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{
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// create the main application window
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new MyFrame;
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return true;
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}
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// ----------------------------------------------------------------------------
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// main frame
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// ----------------------------------------------------------------------------
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// frame constructor
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MyFrame::MyFrame()
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: wxFrame(NULL,
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-1,
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_T("Render wxWindows Sample"),
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wxPoint(50, 50),
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wxSize(450, 340))
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{
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// set the frame icon
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SetIcon(wxICON(sample));
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#if wxUSE_MENUS
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// create a menu bar
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wxMenu *menuFile = new wxMenu;
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menuFile->Append(Render_Load, _T("&Load renderer...\tCtrl-L"));
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menuFile->Append(Render_Unload, _T("&Unload renderer\tCtrl-U"));
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menuFile->Append(Render_Quit, _T("E&xit\tCtrl-Q"), _T("Quit this program"));
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// the "About" item should be in the help menu
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wxMenu *helpMenu = new wxMenu;
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helpMenu->Append(Render_About, _T("&About...\tF1"), _T("Show about dialog"));
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// now append the freshly created menu to the menu bar...
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wxMenuBar *menuBar = new wxMenuBar();
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menuBar->Append(menuFile, _T("&File"));
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menuBar->Append(helpMenu, _T("&Help"));
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// ... and attach this menu bar to the frame
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SetMenuBar(menuBar);
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#endif // wxUSE_MENUS
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m_panel = new MyPanel(this);
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#if wxUSE_STATUSBAR
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// create a status bar just for fun (by default with 1 pane only)
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CreateStatusBar(2);
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SetStatusText(_T("Welcome to wxWindows!"));
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#endif // wxUSE_STATUSBAR
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Show();
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}
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MyFrame::~MyFrame()
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{
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delete wxRendererNative::Set(NULL);
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}
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// event handlers
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void MyFrame::OnLoad(wxCommandEvent& WXUNUSED(event))
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{
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static wxString s_name = _T("renddll");
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wxString name = wxGetTextFromUser
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(
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_T("Name of the renderer to load:"),
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_T("Render wxWindows Sample"),
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s_name,
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this
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);
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if ( name.empty() )
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{
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// cancelled
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return;
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}
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s_name = name;
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wxRendererNative *renderer = wxRendererNative::Load(name);
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if ( !renderer )
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{
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wxLogError(_T("Failed to load renderer \"%s\"."), name.c_str());
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}
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else // loaded ok
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{
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delete wxRendererNative::Set(renderer);
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m_panel->Refresh();
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wxLogStatus(this, _T("Successfully loaded the renderer \"%s\"."),
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name.c_str());
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}
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}
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void MyFrame::OnUnload(wxCommandEvent& WXUNUSED(event))
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{
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wxRendererNative *renderer = wxRendererNative::Set(NULL);
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if ( renderer )
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{
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delete renderer;
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m_panel->Refresh();
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wxLogStatus(this, _T("Unloaded the previously loaded renderer."));
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}
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else
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{
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wxLogWarning(_T("No renderer to unload."));
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}
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}
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void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
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{
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// true is to force the frame to close
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Close(true);
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}
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void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
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{
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wxMessageBox(_T("Render sample shows how to use custom renderers.\n")
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_T("\n")
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_T("<EFBFBD> 2003 Vadim Zeitlin"),
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_T("About Render wxWindows Sample"),
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wxOK | wxICON_INFORMATION, this);
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}
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