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Posted 19 Oct 2011

Improve Zooming with Enhanced Mouse Wheels

, 19 Oct 2011
How to give your users a better zooming experience with High Resolution Mouse Wheels.
// HiResScrollWheelDlg.cpp : implementation file

#include "stdafx.h"
#include "HiResScrollWheel.h"
#include "HiResScrollWheelDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW

// CHiResScrollWheelDlg dialog

CHiResScrollWheelDlg::CHiResScrollWheelDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CHiResScrollWheelDlg::IDD, pParent)
	, m_nWheelDelta(15)
	, m_nTimeDelta(8)
	, m_nEventsPerClick(8)
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);

void CHiResScrollWheelDlg::DoDataExchange(CDataExchange* pDX)
	DDX_Text(pDX, IDC_EDIT1, m_nWheelDelta);
	DDV_MinMaxUInt(pDX, m_nWheelDelta, 1, 240);
	DDX_Text(pDX, IDC_EDIT2, m_nTimeDelta);
	DDV_MinMaxUInt(pDX, m_nTimeDelta, 2, 1000);
	DDX_Text(pDX, IDC_EDIT3, m_nEventsPerClick);
	DDV_MinMaxUInt(pDX, m_nEventsPerClick, 1, 240);

BEGIN_MESSAGE_MAP(CHiResScrollWheelDlg, CDialog)
	ON_EN_CHANGE(IDC_EDIT1, &CHiResScrollWheelDlg::OnEnChangeEdit1)
	ON_EN_CHANGE(IDC_EDIT2, &CHiResScrollWheelDlg::OnEnChangeEdit2)
	ON_EN_CHANGE(IDC_EDIT3, &CHiResScrollWheelDlg::OnEnChangeEdit3)
	ON_BN_CLICKED(IDC_APPLY, &CHiResScrollWheelDlg::OnBnClickedApply)

// CHiResScrollWheelDlg message handlers

__declspec( dllimport ) void SetParameters(int x1, int x2, int x3);

BOOL CHiResScrollWheelDlg::OnInitDialog()

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon

	SetParameters((int)m_nWheelDelta,(int)m_nTimeDelta,(int)m_nEventsPerClick) ;
	GetDlgItem(IDC_APPLY)->EnableWindow(0) ;		
	return TRUE;  // return TRUE  unless you set the focus to a control

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CHiResScrollWheelDlg::OnPaint()
	if (IsIconic())
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);

// The system calls this function to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CHiResScrollWheelDlg::OnQueryDragIcon()
	return static_cast<HCURSOR>(m_hIcon);

void CHiResScrollWheelDlg::OnEnChangeEdit1()
	GetDlgItem(IDC_APPLY)->EnableWindow(1) ;		

void CHiResScrollWheelDlg::OnEnChangeEdit2()
	GetDlgItem(IDC_APPLY)->EnableWindow(1) ;		

void CHiResScrollWheelDlg::OnEnChangeEdit3()
	GetDlgItem(IDC_APPLY)->EnableWindow(1) ;		

void CHiResScrollWheelDlg::OnBnClickedApply()
	if (UpdateData()) {
		// data validated
		SetParameters((int)m_nWheelDelta,(int)m_nTimeDelta,(int)m_nEventsPerClick) ;
		GetDlgItem(IDC_APPLY)->EnableWindow(0) ;		

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About the Author

Stephen H Davis
Software Developer (Senior) Logitech Corporation
United States United States
Stephen lives in Fremont, CA with his wife and daughter and has programmed in C and C++ for a very long time.

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