samples/shaped/shaped.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        shaped.cpp
   3 // Purpose:     Shaped Window sample
   4 // Author:      Robin Dunn
   5 // Modified by:
   6 // Created:     28-Mar-2003
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Robin Dunn
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // For compilers that support precompilation, includes "wx/wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 // for all others, include the necessary headers
  28 #ifndef WX_PRECOMP
  29     #include "wx/app.h"
  30     #include "wx/log.h"
  31     #include "wx/frame.h"
  32     #include "wx/panel.h"
  33     #include "wx/stattext.h"
  34     #include "wx/menu.h"
  35     #include "wx/layout.h"
  36     #include "wx/msgdlg.h"
  37     #include "wx/image.h"
  38 #endif
  39
  40 #include "wx/dcclient.h"
  41 #include "wx/image.h"
  42
  43 // ----------------------------------------------------------------------------
  44 // private classes
  45 // ----------------------------------------------------------------------------
  46
  47 // Define a new application type, each program should derive a class from wxApp
  48 class MyApp : public wxApp
  49 {
  50 public:
  51     // override base class virtuals
  52     // ----------------------------
  53
  54     // this one is called on application startup and is a good place for the app
  55     // initialization (doing it here and not in the ctor allows to have an error
  56     // return: if OnInit() returns false, the application terminates)
  57     virtual bool OnInit();
  58 };
  59
  60
  61 // Define a new frame type: this is going to be our main frame
  62 class ShapedFrame : public wxFrame
  63 {
  64 public:
  65     // ctor(s)
  66     ShapedFrame();
  67     void SetWindowShape();
  68
  69     // event handlers (these functions should _not_ be virtual)
  70     void OnDoubleClick(wxMouseEvent& evt);
  71     void OnLeftDown(wxMouseEvent& evt);
  72     void OnLeftUp(wxMouseEvent& evt);
  73     void OnMouseMove(wxMouseEvent& evt);
  74     void OnExit(wxMouseEvent& evt);
  75     void OnPaint(wxPaintEvent& evt);
  76     void OnWindowCreate(wxWindowCreateEvent& evt);
  77
  78 private:
  79     bool     m_hasShape;
  80     wxBitmap m_bmp;
  81     wxPoint  m_delta;
  82
  83     // any class wishing to process wxWidgets events must use this macro
  84     DECLARE_EVENT_TABLE()
  85 };
  86
  87
  88 // ----------------------------------------------------------------------------
  89 // event tables and other macros for wxWidgets
  90 // ----------------------------------------------------------------------------
  91
  92 // the event tables connect the wxWidgets events with the functions (event
  93 // handlers) which process them. It can be also done at run-time, but for the
  94 // simple menu events like this the static method is much simpler.
  95 BEGIN_EVENT_TABLE(ShapedFrame, wxFrame)
  96     EVT_LEFT_DCLICK(ShapedFrame::OnDoubleClick)
  97     EVT_LEFT_DOWN(ShapedFrame::OnLeftDown)
  98     EVT_LEFT_UP(ShapedFrame::OnLeftUp)
  99     EVT_MOTION(ShapedFrame::OnMouseMove)
 100     EVT_RIGHT_UP(ShapedFrame::OnExit)
 101
 102     EVT_PAINT(ShapedFrame::OnPaint)
 103
 104 #ifdef __WXGTK__
 105     EVT_WINDOW_CREATE(ShapedFrame::OnWindowCreate)
 106 #endif
 107 END_EVENT_TABLE()
 108
 109
 110 // Create a new application object: this macro will allow wxWidgets to create
 111 // the application object during program execution (it's better than using a
 112 // static object for many reasons) and also declares the accessor function
 113 // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 114 // not wxApp)
 115 IMPLEMENT_APP(MyApp)
 116
 117 // ============================================================================
 118 // implementation
 119 // ============================================================================
 120
 121 // ----------------------------------------------------------------------------
 122 // the application class
 123 // ----------------------------------------------------------------------------
 124
 125 // `Main program' equivalent: the program execution "starts" here
 126 bool MyApp::OnInit()
 127 {
 128     wxInitAllImageHandlers();
 129
 130     // Create the main application window
 131     ShapedFrame *frame = new ShapedFrame();
 132     frame->Show(true);
 133     SetTopWindow(frame);
 134
 135     // success: wxApp::OnRun() will be called which will enter the main message
 136     // loop and the application will run. If we returned false here, the
 137     // application would exit immediately.
 138     return true;
 139 }
 140
 141 // ----------------------------------------------------------------------------
 142 // main frame
 143 // ----------------------------------------------------------------------------
 144
 145 // frame constructor
 146 ShapedFrame::ShapedFrame()
 147        : wxFrame((wxFrame *)NULL, wxID_ANY, wxEmptyString,
 148                   wxDefaultPosition, wxSize(100, 100), //wxDefaultSize,
 149                   0
 150                   | wxFRAME_SHAPED
 151                   | wxSIMPLE_BORDER
 152                   | wxFRAME_NO_TASKBAR
 153                   | wxSTAY_ON_TOP
 154             )
 155 {
 156     m_hasShape = false;
 157     m_bmp = wxBitmap(_T("star.png"), wxBITMAP_TYPE_PNG);
 158     SetSize(wxSize(m_bmp.GetWidth(), m_bmp.GetHeight()));
 159     SetToolTip(wxT("Right-click to exit"));
 160
 161 #ifndef __WXGTK__
 162     // On wxGTK we can't do this yet because the window hasn't been created
 163     // yet so we wait until the EVT_WINDOW_CREATE event happens.  On wxMSW and
 164     // wxMac the window has been created at this point so we go ahead and set
 165     // the shape now.
 166     SetWindowShape();
 167 #endif
 168 }
 169
 170 void ShapedFrame::SetWindowShape()
 171 {
 172     wxRegion region(m_bmp, *wxWHITE);
 173     m_hasShape = SetShape(region);
 174 }
 175
 176 void ShapedFrame::OnDoubleClick(wxMouseEvent& WXUNUSED(evt))
 177 {
 178     if (m_hasShape)
 179     {
 180         wxRegion region;
 181         SetShape(region);
 182         m_hasShape = false;
 183     }
 184     else
 185         SetWindowShape();
 186 }
 187
 188 void ShapedFrame::OnLeftDown(wxMouseEvent& evt)
 189 {
 190     CaptureMouse();
 191     //printf("Mouse captured\n");
 192     wxPoint pos = ClientToScreen(evt.GetPosition());
 193     wxPoint origin = GetPosition();
 194     int dx =  pos.x - origin.x;
 195     int dy = pos.y - origin.y;
 196     m_delta = wxPoint(dx, dy);
 197 }
 198
 199 void ShapedFrame::OnLeftUp(wxMouseEvent& WXUNUSED(evt))
 200 {
 201     if (HasCapture())
 202     {
 203         ReleaseMouse();
 204         //printf("Mouse released\n");
 205     }
 206 }
 207
 208 void ShapedFrame::OnMouseMove(wxMouseEvent& evt)
 209 {
 210     wxPoint pt = evt.GetPosition();
 211     //printf("x:%d   y:%d\n", pt.x, pt.y);
 212     if (evt.Dragging() && evt.LeftIsDown())
 213     {
 214         wxPoint pos = ClientToScreen(pt);
 215         Move(wxPoint(pos.x - m_delta.x, pos.y - m_delta.y));
 216     }
 217 }
 218
 219 void ShapedFrame::OnExit(wxMouseEvent& WXUNUSED(evt))
 220 {
 221     Close();
 222 }
 223
 224 void ShapedFrame::OnPaint(wxPaintEvent& WXUNUSED(evt))
 225 {
 226     wxPaintDC dc(this);
 227     dc.DrawBitmap(m_bmp, 0, 0, true);
 228 }
 229
 230 void ShapedFrame::OnWindowCreate(wxWindowCreateEvent& WXUNUSED(evt))
 231 {
 232     SetWindowShape();
 233 }
 234