wxWidgets 不规则透明WinForm窗体（通过透明图片实现）

#include "wx/wxprec.h"class MyFrame;class MyApp : public wxApp {public:virtual bool OnInit();private:MyFrame *frame;};class MyFrame : public wxFrame {private:wxBitmap *bit;wxPoint *point;public:MyFrame();void OnPaint(wxPaintEvent& event);void OnWindowCreate(wxWindowCreateEvent& event);void OnRightClick(wxMouseEvent& event);void OnMouseClickDown(wxMouseEvent& event);void OnMouseMotion(wxMouseEvent& event);void OnMouseClickUp(wxMouseEvent& event);};bool MyApp::OnInit(){this->frame = new MyFrame();this->frame->Show(TRUE);this->SetTopWindow(this->frame);return TRUE;};MyFrame::MyFrame() : wxFrame(NULL,-1,wxT("不规则窗体")){this->SetWindowStyle(wxFRAME_SHAPED|wxSIMPLE_BORDER|wxSTAY_ON_TOP);::wxInitAllImageHandlers();wxImage *img = new wxImage(wxT("d:\\bg.png"),wxBITMAP_TYPE_ANY);this->SetSize(img->GetWidth(),img->GetHeight());img->SetMask(TRUE);img->SetMaskColour(255,255,255);bit = new wxBitmap(*img);this->Bind(wxEVT_PAINT,&MyFrame::OnPaint,this);wxRegion *r = new wxRegion(*bit);this->SetShape(*r);this->Bind(wxEVT_RIGHT_UP,&MyFrame::OnRightClick,this);this->point = new wxPoint(0,0);this->Bind(wxEVT_LEFT_DOWN,&MyFrame::OnMouseClickDown,this);this->Bind(wxEVT_LEFT_UP,&MyFrame::OnMouseClickUp,this);this->Bind(wxEVT_MOTION,&MyFrame::OnMouseMotion,this);};void MyFrame::OnPaint(wxPaintEvent& event){wxPaintDC *dc = new wxPaintDC(this);if(bit->IsOk()){dc->DrawBitmap(*bit,0,0,TRUE);}};void MyFrame::OnWindowCreate(wxWindowCreateEvent& event){wxRegion *r = new wxRegion(*bit);this->SetShape(*r);}void MyFrame::OnRightClick(wxMouseEvent& event){if(wxMessageBox(wxT("是否退出程序?"),wxT("退出"),wxYES_NO,this) == 2){wxExit();}};void MyFrame::OnMouseClickDown(wxMouseEvent& event){this->CaptureMouse();event.GetPosition(&this->point->x,&this->point->y);};void MyFrame::OnMouseClickUp(wxMouseEvent& event){if(this->HasCapture()){this->ReleaseMouse();}};void MyFrame::OnMouseMotion(wxMouseEvent& event){if(event.Dragging() && event.LeftIsDown()){int x,y;event.GetPosition(&x,&y);this->ClientToScreen(&x,&y);this->Move(x-this->point->x,y-this->point->y);}};IMPLEMENT_APP(MyApp);