Win32写的磁性窗体

#include "stdafx.h" #include "MagnetDialog.h" char * g_ChildClassNam = "MagneticDlg"; CMagnetDialog *dlg = NULL; LRESULT CALLBACK WndMagnetProc( HWND hWnd, UINT nMsg, WPARAM wParam, LPARAM lParam ) { switch( nMsg ) { case WM_PAINT: { PAINTSTRUCT ps = { 0 }; HDC dc = BeginPaint( hWnd, &ps ); char *pBuf = "磁性窗口"; ::TextOut( dc, 100, 50, pBuf, strlen(pBuf) ); ::EndPaint( hWnd, &ps); } break; case WM_LBUTTONDOWN: ::SendMessage( hWnd, WM_SYSCOMMAND, SC_MOVE | HTCAPTION ,NULL); break; case WM_WINDOWPOSCHANGING: dlg->ChildCheckMagnetism( lParam ); break; case WM_CLOSE: case WM_DESTROY: break; } return DefWindowProc( hWnd, nMsg, wParam, lParam ); } CMagnetDialog::CMagnetDialog( HINSTANCE hInst, HWND pwnd ) :m_hInst(hInst), m_pWnd(pwnd) { dlg = this; m_nWith = 300; m_nHeight = 150; m_isAdsorption = false; ::GetWindowRect( m_pWnd, &m_RcParent ); GetMainRc( &m_RcParent ); InitDlg( g_ChildClassNam ); m_hWnd = ::CreateWindow( g_ChildClassNam, "磁性窗口", WS_TILEDWINDOW|WS_VISIBLE|WS_SYSMENU|WS_MINIMIZEBOX|WS_CAPTION|DS_CENTER, 400, 450, m_nWith, m_nHeight, NULL, NULL, m_hInst, NULL ); } CMagnetDialog::~CMagnetDialog() { } BOOL CMagnetDialog::InitDlg( char * lpClassName ) { WNDCLASSEX wce = { 0 }; wce.cbSize = sizeof( wce ); wce.style = CS_HREDRAW|CS_VREDRAW; wce.cbClsExtra = 0; wce.cbWndExtra = 0; wce.hInstance = m_hInst; wce.lpfnWndProc = WndMagnetProc; wce.hIcon = 0; wce.hIconSm = NULL; wce.hCursor = LoadCursor(NULL,IDC_ARROW); wce.hbrBackground = (HBRUSH)(COLOR_WINDOW+1); wce.lpszMenuName = NULL; wce.lpszClassName = lpClassName; ATOM nAtom = RegisterClassEx( &wce ); if( 0 == nAtom ) { return FALSE; } return TRUE; } // ON_WM_MOVING() // CMagnetDialog 消息处理程序 void CMagnetDialog::GetMainRc( RECT * rc ) { ::CopyRect( &m_RcParent, rc ); //------------------------------------------顶端磁力范围 m_TopRc.left = m_RcParent.left-OFFSETMOVE; m_TopRc.top = m_RcParent.bottom-OFFSETMOVE; m_TopRc.right = m_RcParent.right+OFFSETMOVE; m_TopRc.bottom = m_RcParent.bottom+OFFSETMOVE; //------------------------------------------左侧磁力范围 m_LeftRc if( m_isAdsorption ) { ::SetWindowPos( m_hWnd, 0, rc->left, rc->bottom, 0, 0, SWP_NOSIZE ); } m_LeftRc.left = m_RcParent.left-OFFSETMOVE; m_LeftRc.top = m_RcParent.bottom-OFFSETMOVE; m_LeftRc.right = m_RcParent.left+OFFSETMOVE; m_LeftRc.bottom = m_RcParent.bottom+m_nHeight+OFFSETMOVE; } void CMagnetDialog::ChildCheckMagnetism( LPARAM lParam ) { PWINDOWPOS pPos = (WINDOWPOS *)lParam; POINT pt; pt.x = pPos->x; pt.y = pPos->y; if( ( pPos->x | pPos->y | pPos->cx | pPos->cy ) == 0 ) return; m_isAdsorption = false; if( ::PtInRect( &m_TopRc, pt ) ) { m_isAdsorption = true; pPos->y = m_RcParent.bottom; pPos->cy = pPos->y + pPos->cy - m_RcParent.bottom; } if( ::PtInRect( &m_LeftRc, pt ) ) { m_isAdsorption = true; pPos->x = m_RcParent.left; pPos->cx = pPos->x + pPos->cx - m_RcParent.left; } return; }