nbutton.cpp

来自「EVC环境下用SDK开发WINCE的应用程序」· C++ 代码 · 共 107 行

// NButton.cpp: implementation of the CNButton class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "navgps.h"
#include "NButton.h"

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

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CNButton::CNButton()
{
	// do not erase bkgnd in default.
//	m_bTransparent = TRUE;
//	m_crBkgndColor = KEY_COLOR;
}

CNButton::~CNButton()
{

}

BOOL CNButton::Create(LPCTSTR lpszCaption, DWORD dwStyle,
		const RECT& rect, CNWnd* pParentWnd, UINT nID)
{
	CNWnd* pWnd = this;
	return pWnd->Create(_T("BUTTON"), lpszCaption, dwStyle, rect, pParentWnd, nID);
}

void CNButton::OnDrawItem(int /*nIDCtl*/, LPDRAWITEMSTRUCT lpDrawItemStruct)
{
	// it must be overrided by derived class.
	ASSERT(FALSE);
}
/*
BOOL CNButton::OnEraseBkgnd(HDC hdc)
{
	// it's unneccessary to erase background in default,
	// if want, do it in derived class.
	// 
	return TRUE;
}
*/
void CNButton::PreSubclassWindow()
{
	CNWnd::PreSubclassWindow();

	DWORD dwStyle = ::GetWindowLong(GetSafeHwnd(), GWL_STYLE);
	dwStyle = dwStyle | BS_OWNERDRAW | BS_PUSHBUTTON;
	SetWindowLong(GetSafeHwnd(), GWL_STYLE, dwStyle);
}

void CNButton::OnLButtonDblClk(UINT nFlags, POINT point)
{
	SendMessage(WM_LBUTTONDOWN, nFlags, MAKELONG(point.x, point.y));
}

//
// we process the WM_PAINT message by ourselves, not by windows, 
// for getting better performance, ignore some functions or characters
// not used in the application.
//
void CNButton::OnDraw(HDC hdc)
{
//	PAINTSTRUCT		ps;
	DRAWITEMSTRUCT	dis;
	RECT			rect;

	GetClientRect(&rect);
//	BeginPaint(GetSafeHwnd(), &ps);

//	HFONT	hOldFont = (HFONT)::SelectObject(g_hdcUI, GetFont());
//	HRGN	hOldRgn = (HRGN)::SelectObject(g_hdcUI, GetUpdateRgn());
	// Here we assume all the buttons dervied by this class are 
	// OwnerDraw buttons(in this app, all buttons are ownerdrawed). 
	// generate drawitem message.
	memset(&dis, 0, sizeof(dis));
	dis.CtlType		= ODT_BUTTON;
	dis.itemState	= IsWindowEnabled() ? 0 : ODS_DISABLED;
	dis.itemState	|= (BST_PUSHED & SendMessage(BM_GETSTATE,0,0)) ? ODS_SELECTED : 0;
	dis.hwndItem	= GetSafeHwnd();
	dis.hDC			= hdc;//g_hdcUI;
	dis.rcItem		= rect;
	
	//::SendMessage(GetParent()->GetSafeHwnd(), WM_DRAWITEM, 
	//	(WPARAM)GetDlgCtrlID(GetSafeHwnd()),(LPARAM)&dis);
	
	// for getting best performance, we could call OnDrawItem here(just for our app),
	// not following the windows philosophy to process this message.
	// If want to do the same with windows, call the prceding commented code.
	//
	OnDrawItem(0, &dis);
	
//	SelectObject(g_hdcUI, hOldFont);
//	SelectObject(g_hdcUI, hOldRgn);

//	EndPaint(GetSafeHwnd(), &ps);
}