coolmenu.cpp

Visual C++高级界面特效制作百例 本书通过100个实例全面讲述了应用Visual C++的MFC进行高级界面编程的思想。书中均以一个实例的详细实现步骤为引子

////////////////////////////////////////////////////////////////
// CoolMenu 1997 Microsoft Systems Journal. 
// If this code works, it was written by Paul DiLascia.
// If not, I don't know who wrote it.
//
#include "StdAfx.h"
#include "CoolMenu.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

// if you want to see extra TRACE diagnostics, set below to TRUE
BOOL CCoolMenuManager::bTRACE = FALSE;

#ifdef _DEBUG
#define CMTRACEFN			\
	CTraceFn __fooble;	\
	if (bTRACE)				\
		TRACE
#define CMTRACE			\
	if (bTRACE)				\
		TRACE
#else
#define CMTRACEFN TRACE
#define CMTRACE   TRACE
#endif

// constants used for drawing
const CXGAP = 1;				// num pixels between button and text
const CXTEXTMARGIN = 2;		// num pixels after hilite to start text
const CXBUTTONMARGIN = 2;	// num pixels wider button is than bitmap
const CYBUTTONMARGIN = 2;	// ditto for height

// DrawText flags
const DT_MYSTANDARD = DT_SINGLELINE|DT_LEFT|DT_VCENTER;

// identifies owner-draw data as mine
const LONG MYITEMID = MAKELONG(MAKEWORD('m','i'),MAKEWORD('d','0'));

// private struct: one of these for each owner-draw menu item
struct CMyItemData {
	long		magicNum;		// magic number identifying me
	CString	text;				// item text
	UINT		fType;			// original item type flags
	int		iButton;			// index of button image in image list
	CMyItemData()				{ magicNum = MYITEMID; }
	BOOL IsMyItemData()		{ return magicNum == MYITEMID; }
};

IMPLEMENT_DYNAMIC(CCoolMenuManager, CSubclassWnd)

CCoolMenuManager::CCoolMenuManager()
{
	m_szBitmap = m_szButton = CSize(0,0);	// will compute later
	m_bShowButtons = TRUE;						// show buttons by default
	m_bAutoAccel = TRUE;							// auto accelerators by default
	m_hAccel = NULL;								// no accelerators loaded yet
	m_pAccel = NULL;								// no accelerators loaded yet
	m_bUseDrawState = FALSE;					// use DrawEmbossed by default
	m_bDrawDisabledButtonsInColor = FALSE;	// use color for disabled buttons
	FixMFCDotBitmap();
}

CCoolMenuManager::~CCoolMenuManager()
{
	Destroy();
}

//////////////////
// Destroy everything. Called from destructor and Refresh.
//
void CCoolMenuManager::Destroy()
{
	m_ilButtons.DeleteImageList();
	m_mapIDtoImage.RemoveAll();
	m_szBitmap = m_szButton = CSize(0,0);
	m_arToolbarID.RemoveAll();
	m_fontMenu.DeleteObject();
	DestroyAccel();
}

/////////////////
// Destroy accelerators
//
void CCoolMenuManager::DestroyAccel()
{
	m_mapIDtoAccel.RemoveAll();		// delete ACCEL entries in map
	delete m_pAccel;						// delete current accelerators
	m_pAccel = NULL;						// ...
}

//////////////////
// Call this to install the menu manager. Install(NULL) to un-install.
//
void CCoolMenuManager::Install(CFrameWnd* pFrame)
{
	ASSERT_VALID(pFrame);
	m_pFrame = pFrame;
	HookWindow(pFrame);   // install message hook
}

//////////////////
// Load array of toolbar IDs.
//
BOOL CCoolMenuManager::LoadToolbars(const UINT* arID, int n)
{
	ASSERT(arID);
	BOOL bRet = TRUE;
	for (int i=0; i<n; i++)
		bRet |= LoadToolbar(arID[i]);
	return bRet;
}

// structure of RT_TOOLBAR resource
struct TOOLBARDATA {
	WORD wVersion;		// version # should be 1
	WORD wWidth;		// width of one bitmap
	WORD wHeight;		// height of one bitmap
	WORD wItemCount;	// number of items
	WORD items[1];		// array of command IDs, actual size is wItemCount
};

//////////////////
// Load one toolbar. Assumes bg color is gray.
// 
//  * add toolbar bitmap to image list
//	 * add each button ID to button map
//
BOOL CCoolMenuManager::LoadToolbar(UINT nIDToolbar)
{
	// load bitmap
	HBITMAP hbmToolbar = PxLib::LoadSysColorBitmap(nIDToolbar);
	if (!hbmToolbar) {
		TRACE(_T("*** Can't load bitmap for toolbar %d!\n"), nIDToolbar);
		return FALSE;
	}
	CBitmap bmToolbar;
	bmToolbar.Attach(hbmToolbar); // destructor will detach & destroy

	// load toolbar
	LPTSTR lpResName = MAKEINTRESOURCE(nIDToolbar);
	HINSTANCE hInst;
	HRSRC hRsrc;
	TOOLBARDATA* ptbd;
	if ((hInst= AfxFindResourceHandle(lpResName, RT_TOOLBAR)) == NULL ||
		 (hRsrc= FindResource(hInst, lpResName, RT_TOOLBAR))   == NULL ||
		 (ptbd = (TOOLBARDATA*)LoadResource(hInst, hRsrc))     == NULL) {

		TRACE(_T("*** Can't load toolbar %d!\n"), nIDToolbar);
		return FALSE;
	}
	ASSERT(ptbd->wVersion==1);
		
	// OK, I have the bitmap and toolbar. 

	CSize sz(ptbd->wWidth, ptbd->wHeight);
	if (m_szBitmap.cx==0) {
		// First toolbar: initialized bitmap/button sizes and create image list.
		m_szBitmap = sz;
		m_szButton = sz + CSize(CXBUTTONMARGIN<<1, CYBUTTONMARGIN<<1);
		VERIFY(m_ilButtons.Create(sz.cx, sz.cy, ILC_MASK, 0, 10));

	} else if (m_szBitmap != sz) {
		// button sizes different -- oops
		TRACE(_T("*** Toolbar %d button size differs!\n"), nIDToolbar);
		return FALSE;
	}
	
	// I have a good toolbar: now add bitmap to the image list, and each
	// command ID to m_mapIDtoImage array. Note that LoadSysColorBitmap will
	// change gray -> COLOR_3DFACE, so use that for image list background.
	//
	int iNextImage = m_ilButtons.GetImageCount();
	m_ilButtons.Add(&bmToolbar, GetSysColor(COLOR_3DFACE));
	for (int i = 0; i < ptbd->wItemCount; i++) {
		UINT nID = ptbd->items[i];
		if (nID > 0) {
			if (GetButtonIndex(nID) >= 0) {
				TRACE(_T("*** Duplicate button ID %d ignored\n"), nID);
			} else {
				m_mapIDtoImage.SetAt(nID, (void*)iNextImage);
				TRACE("CCoolMenuManager::LoadToolbar(). Added Menu Id %d, Button Number %d\n", nID, iNextImage-1);
			}
			// Andrew Bancroft 13-08-98. Since we've already added the entire toolbar to the imagelist
			// we need to increment nNextImage even if we didn't add this button to
			// m_mapIDtoImage.
			iNextImage++;
		}
	}
	m_arToolbarID.Add(nIDToolbar);  // remember toolbar ID for Refresh
	bmToolbar.Detach();
	return TRUE; // success!
}

//////////////////
// Virtual CSubclassWnd window proc. All messages come here before frame
// window. Isn't it cool? Just like in the old days!
//
LRESULT CCoolMenuManager::WindowProc(UINT msg, WPARAM wp, LPARAM lp)
{
	switch(msg) {
	case WM_SYSCOLORCHANGE:
	case WM_SETTINGCHANGE:
		Refresh();
		break;

	case WM_MEASUREITEM:
		if (OnMeasureItem((MEASUREITEMSTRUCT*)lp))
			return TRUE; // handled
		break;

	case WM_DRAWITEM:
		if (OnDrawItem((DRAWITEMSTRUCT*)lp))
			return TRUE; // handled
		break;

	case WM_INITMENUPOPUP:
		// Very important: must let frame window handle it first!
		// Because if someone calls CCmdUI::SetText, MFC will change item to
		// MFT_STRING, so I must change back to MFT_OWNERDRAW.
		//
		CSubclassWnd::WindowProc(msg, wp, lp);
		OnInitMenuPopup(CMenu::FromHandle((HMENU)wp),
			(UINT)LOWORD(lp), (BOOL)HIWORD(lp));
		return 0;

	case WM_MENUSELECT:
		OnMenuSelect((UINT)LOWORD(wp), (UINT)HIWORD(wp), (HMENU)lp);
		break;

	case WM_MENUCHAR:
		LRESULT lr = OnMenuChar((TCHAR)LOWORD(wp), (UINT)HIWORD(wp),
			CMenu::FromHandle((HMENU)lp));
		if (lr!=0)
			return lr;
		break;
	}
	return CSubclassWnd::WindowProc(msg, wp, lp);
}

//////////////////
// Refresh all colors, fonts, etc. For WM_SETTINGCHANGE, WM_SYSCOLORCHANGE.
//
void CCoolMenuManager::Refresh()
{
	// first copy list (array) of toolbar IDs now loaded.
	CUIntArray arToolbarID;
	arToolbarID.Copy(m_arToolbarID);

	// destroy everything
	Destroy();

	// re-load toolbars.
	int nToolbars = arToolbarID.GetSize();
	for (int i = 0; i < nToolbars; i++)
		LoadToolbar(arToolbarID[i]);
}

//////////////////
// Get menu font, creating if needed
//
CFont* CCoolMenuManager::GetMenuFont()
{
	if (!(HFONT)m_fontMenu) {
		NONCLIENTMETRICS info;
		info.cbSize = sizeof(info);
		SystemParametersInfo(SPI_GETNONCLIENTMETRICS, sizeof(info), &info, 0);
		VERIFY(m_fontMenu.CreateFontIndirect(&info.lfMenuFont));
	}
	return &m_fontMenu;
}

//////////////////
// Handle WM_MEASUREITEM on behalf of frame: compute menu item size.
//
BOOL CCoolMenuManager::OnMeasureItem(LPMEASUREITEMSTRUCT lpms)
{
	ASSERT(lpms);
	CMyItemData* pmd = (CMyItemData*)lpms->itemData;
	ASSERT(pmd);
	if (lpms->CtlType != ODT_MENU || !pmd->IsMyItemData())
		return FALSE; // not handled by me

	if (pmd->fType & MFT_SEPARATOR) {
		// separator: use half system height and zero width
		lpms->itemHeight = GetSystemMetrics(SM_CYMENU)>>1;
		lpms->itemWidth  = 0;

	} else {

		// compute size of text: use DrawText with DT_CALCRECT

		CWindowDC dc(NULL);	// screen DC--I won't actually draw on it
		CRect rcText(0,0,0,0);
		CFont* pOldFont = dc.SelectObject(GetMenuFont());
		dc.DrawText(pmd->text, rcText, DT_MYSTANDARD|DT_CALCRECT);
		dc.SelectObject(pOldFont);

		// height of item is just height of a standard menu item
		lpms->itemHeight= max(GetSystemMetrics(SM_CYMENU), rcText.Height());

		// width is width of text plus a bunch of stuff
		int cx = rcText.Width();	// text width 
		cx += CXTEXTMARGIN<<1;		// L/R margin for readability
		cx += CXGAP;					// space between button and menu text
		cx += m_szButton.cx<<1;		// button width (L=button; R=empty margin)

		// whatever value I return in lpms->itemWidth, Windows will add the
		// width of a menu checkmark, so I must subtract to defeat Windows. Argh.
		//
		cx -= GetSystemMetrics(SM_CXMENUCHECK)-1;
		lpms->itemWidth = cx;		// done deal

		CMTRACE(_T("OnMeasureItem for '%s':\tw=%d h=%d\n"), (LPCTSTR)pmd->text,
			lpms->itemWidth, lpms->itemHeight);
	}
	return TRUE; // handled
}

/////////////////
// Handle WM_DRAWITEM on behalf of frame. Note: in all that goes
// below, can't assume rcItem.left=0 because of multi-column menus!
//
BOOL CCoolMenuManager::OnDrawItem(LPDRAWITEMSTRUCT lpds)
{
	ASSERT(lpds);
	
	// Omar L Francisco
	if (lpds->CtlType != ODT_MENU)
		return FALSE;
	
	// Omar L Francisco
	CMyItemData* pmd = (CMyItemData*)lpds->itemData;
	ASSERT(pmd);
	if (!pmd->IsMyItemData())
		return FALSE;
	
	ASSERT(lpds->itemAction != ODA_FOCUS);
	ASSERT(lpds->hDC);
	CDC dc;
	dc.Attach(lpds->hDC);

	const CRect& rcItem = lpds->rcItem;
	if (pmd->fType & MFT_SEPARATOR) {
		// draw separator
		CRect rc = rcItem;								// copy rect
		rc.top += rc.Height()>>1;						// vertical center
		dc.DrawEdge(&rc, EDGE_ETCHED, BF_TOP);		// draw separator line

	} else {													// not a separator

		CMTRACE(_T("OnDrawItem for '%s':\tw=%d h=%d\n"), (LPCTSTR)pmd->text,
			rcItem.Width(), rcItem.Height());

		BOOL bDisabled = lpds->itemState & ODS_GRAYED;
		BOOL bSelected = lpds->itemState & ODS_SELECTED;
		BOOL bChecked  = lpds->itemState & ODS_CHECKED;
		BOOL bHaveButn=FALSE;

		// Paint button, or blank if none
		CRect rcButn(rcItem.TopLeft(), m_szButton);	// button rect
		rcButn += CPoint(0,									// center vertically
			(rcItem.Height() - rcButn.Height())>>1 );

		int iButton = pmd->iButton;
		if (iButton >= 0) {

			// this item has a button!
			bHaveButn = TRUE;

			// compute point to start drawing
			CSize sz = rcButn.Size() - m_szBitmap;
			sz.cx >>= 1;
			sz.cy >>= 1;
			CPoint p(rcButn.TopLeft() + sz);

			// draw disabled or normal
			if (!bDisabled) {
				// normal: fill BG depending on state
				PxLib::FillRect(dc, rcButn, GetSysColor(
					(bChecked && !bSelected) ? COLOR_3DLIGHT : COLOR_MENU));

				// draw pushed-in or popped-out edge
				if (bSelected || bChecked) {
					CRect rc2 = rcButn;
					dc.DrawEdge(rc2, bChecked ? BDR_SUNKENOUTER : BDR_RAISEDINNER,
						BF_RECT);
				}
				// draw the button!
				m_ilButtons.Draw(&dc, iButton, p, ILD_TRANSPARENT);

			} else if (m_bUseDrawState) {
				// use DrawState to draw disabled button: must convert to icon
				HICON hIcon=m_ilButtons.ExtractIcon(iButton);
				ASSERT(hIcon);
				dc.DrawState(p, CSize(0,0), hIcon, DSS_DISABLED, (HBRUSH)NULL);
				DestroyIcon(hIcon);

			} else
				// use DrawEmbossed to draw disabeld button, w/color flag
				PxLib::DrawEmbossed(dc, m_ilButtons, iButton, p,
					m_bDrawDisabledButtonsInColor);

		} else {
			// no button: look for custom checked/unchecked bitmaps
			CMenuItemInfo info;
			info.fMask = MIIM_CHECKMARKS;
			GetMenuItemInfo((HMENU)lpds->hwndItem,
				lpds->itemID, MF_BYCOMMAND, &info);
			if (bChecked || info.hbmpUnchecked) {
				bHaveButn = Draw3DCheckmark(dc, rcButn, bSelected,
					bChecked ? info.hbmpChecked : info.hbmpUnchecked);
			}
		}

		// Done with button, now paint text. First do background if needed.
		int cxButn = m_szButton.cx;				// width of button
		COLORREF colorBG = GetSysColor(bSelected ? COLOR_HIGHLIGHT : COLOR_MENU);
		if (bSelected || lpds->itemAction==ODA_SELECT) {
			// selected or selection state changed: paint text background
			CRect rcBG = rcItem;							// whole rectangle
			if (bHaveButn)									// if there's a button:
				rcBG.left += cxButn + CXGAP;			//  don't paint over it!
			PxLib::FillRect(dc, rcBG, colorBG);	// paint it!
		}

		// compute text rectangle and colors
		CRect rcText = rcItem;				 // start w/whole item
		rcText.left += cxButn + CXGAP + CXTEXTMARGIN; // left margin
		rcText.right -= cxButn;				 // right margin
		dc.SetBkMode(TRANSPARENT);			 // paint transparent text
		COLORREF colorText = GetSysColor(bDisabled ?  COLOR_GRAYTEXT :
			bSelected ? COLOR_HIGHLIGHTTEXT : COLOR_MENUTEXT);

		// Now paint menu item text.	No need to select font,
		// because windows sets it up before sending WM_DRAWITEM
		//
		if (bDisabled && (!bSelected || colorText == colorBG)) {
			// disabled: draw hilite text shifted southeast 1 pixel for embossed
			// look. Don't do it if item is selected, tho--unless text color same
			// as menu highlight color. Got it?
			//
			DrawMenuText(dc, rcText + CPoint(1,1), pmd->text,
				GetSysColor(COLOR_3DHILIGHT));
		}
		DrawMenuText(dc, rcText, pmd->text, colorText); // finally!
	}
	dc.Detach();

	return TRUE; // handled
}

/////////////////
// Helper function to draw justified menu text. If the text contains a TAB,
// draw everything after the tab right-aligned
//
void CCoolMenuManager::DrawMenuText(CDC& dc, CRect rc, CString text,
	COLORREF color)
{
	CString left = text;