A Freeware MFC PushPin button class(15KB)

/* Module : PUSHPIN.H Purpose: Implementation of a push pin button (as seen on X-Windows & property dialogs in VC 4) Created: PJN / 04-04-1996 History: PJN / 08-06-1996 / Removed win32sup.h include PJN / 20-11-1997 / Major Update to code, changes include 1. Support non default color schemes 2. Supports dynamic changes to color schemes 3. Complete restructuring of code 4. Can now use an edged bitmap if you want to 5. Dropped support for Win16 6. Redid the example program 7. Simplified external usage of class PJN / 24-11-1997 1. Minor changes to support CPushPinFrame class PJN / 07-12-1997 Minor changes to fix a small redraw bug PJN / 22-02-1999 1. A number of small code updates PJN / 02-06-1999 1. Added a number of comments to improvde code readibility. 2. Changed the resouce id of the button bitmaps to more meaningful values. 3. Class no longer uses message reflection to catch changes in the clicked state. This means that parent classes can now catch the clicked notification. 4. Code now uses mouse capturing which means that the button appears pressed if you click and hold the left mouse button over the push pin. This gives the pushpin class this standard button behaviour. PJN / 14-05-2000 Button now sends WM_COMMAND messages to the parent as a standard button does. Copyright (c) 1997 - 2000 by PJ Naughter. All rights reserved. */ ///////////////////////////////// Includes ////////////////////////////////// #include "stdafx.h" #include "resource.h" #include "PushPin.h" ////////////////////////////////// Macros /////////////////////////////////// #ifdef _DEBUG #undef THIS_FILE static char BASED_CODE THIS_FILE[] = __FILE__; #define new DEBUG_NEW #endif ////////////////////////////////// Implementation ///////////////////////////// BEGIN_MESSAGE_MAP(CPushPinButton, CButton) //{{AFX_MSG_MAP(CPushPinButton) ON_WM_LBUTTONDOWN() ON_WM_LBUTTONUP() ON_WM_MOUSEMOVE() ON_WM_CAPTURECHANGED() //}}AFX_MSG_MAP END_MESSAGE_MAP() CPushPinButton::CPushPinButton() { //Initialise our variables to default values m_bPinned = FALSE; m_bUseEdge = FALSE; m_MaxRect = CRect(0, 0, 0, 0); m_bCaptured = FALSE; //Load up the bitmaps used in the push pin LoadBitmaps(); } void CPushPinButton::ReloadBitmaps() { //free the bitmap resources m_PinnedBitmap.DeleteObject(); m_UnPinnedBitmap.DeleteObject(); //Reload the bitmaps LoadBitmaps(); //size to content SizeToContent(); //Invalidate the maximum rect of the pushpin on the parent window GetParent()->InvalidateRect(m_MaxRect); //Force this button to redraw aswell Invalidate(); } void CPushPinButton::LoadBitmaps() { //Load up the necessary bitmaps using the SDK call LoadImage if (m_bUseEdge) { BOOL bLoad = m_PinnedBitmap.Attach((HBITMAP) ::LoadImage(AfxGetResourceHandle(), MAKEINTRESOURCE(IDB_PP_PINNEDEDGE), IMAGE_BITMAP, 0, 0, LR_LOADMAP3DCOLORS)); ASSERT(bLoad); bLoad = m_UnPinnedBitmap.Attach((HBITMAP) ::LoadImage(AfxGetResourceHandle(), MAKEINTRESOURCE(IDB_PP_UNPINNEDEDGE), IMAGE_BITMAP, 0, 0, LR_LOADMAP3DCOLORS)); ASSERT(bLoad); } else { BOOL bLoad = m_PinnedBitmap.Attach((HBITMAP) ::LoadImage(AfxGetResourceHandle(), MAKEINTRESOURCE(IDB_PP_PINNED), IMAGE_BITMAP, 0, 0, LR_LOADMAP3DCOLORS)); ASSERT(bLoad); bLoad = m_UnPinnedBitmap.Attach((HBITMAP) ::LoadImage(AfxGetResourceHandle(), MAKEINTRESOURCE(IDB_PP_UNPINNED), IMAGE_BITMAP, 0, 0, LR_LOADMAP3DCOLORS)); ASSERT(bLoad); } } void CPushPinButton::DrawItem(LPDRAWITEMSTRUCT lpDIS) { ASSERT(lpDIS != NULL); //select the bitmap to use depending on the pinned //and captured state CBitmap* pBitmap; if (m_bPinned || (m_bCaptured && m_bCapturePinned)) pBitmap = &m_PinnedBitmap; else pBitmap = &m_UnPinnedBitmap; // draw the bitmap into a compatible memory DC CDC* pDC = CDC::FromHandle(lpDIS->hDC); CDC memDC; memDC.CreateCompatibleDC(pDC); CBitmap* pOld = memDC.SelectObject(pBitmap); if (pOld == NULL) return; // destructors will clean up //Then bitblt it onto the screen DC CRect rect; rect.CopyRect(&lpDIS->rcItem); pDC->BitBlt(rect.left, rect.top, rect.Width(), rect.Height(), &memDC, 0, 0, SRCCOPY); memDC.SelectObject(pOld); } void CPushPinButton::SetPinned(BOOL bPinned) { m_bPinned = bPinned; Invalidate(); } void CPushPinButton::SetUseEdgeBitmap(BOOL bUseEdge) { if (bUseEdge == m_bUseEdge) //quick return return; m_bUseEdge = bUseEdge; //toggle the option, reload and ReloadBitmaps(); //and force a redraw } void CPushPinButton::PreSubclassWindow() { CButton::PreSubclassWindow(); //Pushpin buttons must be owner draw ASSERT(GetWindowLong(m_hWnd, GWL_STYLE) & BS_OWNERDRAW); //size to content SizeToContent(); } void CPushPinButton::SizeToContent() { ASSERT(m_PinnedBitmap.m_hObject != NULL); CSize bitmapSize; BITMAP bmInfo; VERIFY(m_PinnedBitmap.GetObject(sizeof(bmInfo), &bmInfo) == sizeof(bmInfo)); //Calculate the client rect in parent coordinates of the maximum size of the pushpin button m_MaxRect = CRect(0, 0, max(bmInfo.bmWidth, m_MaxRect.Width()), max(bmInfo.bmHeight, m_MaxRect.Height())); ClientToScreen(&m_MaxRect); CPoint p1(m_MaxRect.left, m_MaxRect.top); CPoint p2(m_MaxRect.right, m_MaxRect.bottom); HWND hParent = ::GetParent(m_hWnd); ::ScreenToClient(hParent, &p1); ::ScreenToClient(hParent, &p2); m_MaxRect = CRect(p1, p2); //resize the button to match the size of the bitmap VERIFY(SetWindowPos(NULL, -1, -1, bmInfo.bmWidth, bmInfo.bmHeight, SWP_NOMOVE|SWP_NOZORDER|SWP_NOREDRAW|SWP_NOACTIVATE)); } void CPushPinButton::OnLButtonDown(UINT nFlags, CPoint point) { //Capture the mouse SetCapture(); m_bCaptured = TRUE; // Let the parent class do its thing CButton::OnLButtonDown(nFlags, point); } void CPushPinButton::OnLButtonUp(UINT nFlags, CPoint point) { //Release the capture ReleaseCapture(); m_bCaptured = FALSE; //Toggle the state of the pin and force a redraw //if over the button CRect r; GetClientRect(&r); if (r.PtInRect(point)) { m_bPinned = !m_bPinned; Invalidate(); //Send the WM_COMMAND message to the parents manually GetWindowLong GetParent()->SendMessage(WM_COMMAND, MAKEWPARAM(GetWindowLong(GetSafeHwnd(), GWL_ID), 0), (LPARAM) GetSafeHwnd()); } // Let the parent class do its thing CButton::OnLButtonUp(nFlags, point); } void CPushPinButton::OnMouseMove(UINT nFlags, CPoint point) { //Handle changing the pinned state as the mouse is //moved over the push pin if (m_bCaptured) { CRect r; GetClientRect(&r); if (r.PtInRect(point)) { if (!m_bCapturePinned) Invalidate(); m_bCapturePinned = TRUE; } else { if (m_bCapturePinned) Invalidate(); m_bCapturePinned = FALSE; } } //Let the parent class do its t