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Introduction

Implementing Rulers inside of Splitter Panes - 2. This article provides an example to implementation in an MDI and SDI application.

I have changed the way to create the ruler, add function to Show/Hide the ruler and reformat some part of code.

Implementation

MDI way

#include "Ruler.h"
class CChildFrame : public CMDIChildWnd
{
    ...
    private: CRulerSplitterWnd m_Rulers; //Ruler object
    public: void ShowRulers(BOOL bShow);//Toggle the ruler
    void UpdateRulersInfo(stRULER_INFO stRulerInfo);//Update the ruler
    ...
};
//Create the ruler

BOOL CChildFrame::OnCreateClient(LPCREATESTRUCT lpcs, 
                                CCreateContext* pContext)
{
    if (!m_Rulers.CreateRulers(this, pContext)) {
        TRACE("Error creation of rulers\n");
        return CMDIChildWnd::OnCreateClient(lpcs, pContext);
    }
    return TRUE;
}

//Toggle the ruler
void CChildFrame::ShowRulers(BOOL bShow)
{
    m_Rulers.ShowRulers(bShow);

}

//Update the ruler

void CChildFrame::UpdateRulersInfo(stRULER_INFO stRulerInfo)
{
    m_Rulers.UpdateRulersInfo(stRulerInfo);
}

SDI way

#include "Ruler.h"
class CMainFrame : public CFrameWnd
{
    ....

All the rest is the same as MDI implementation.

Interaction

In your view (In this case CScrollView), catch >OnMouseMove, OnVScroll and OnHScroll messages to interact with the ruler.

//Update mouse position on the ruler

void CDemoView::OnMouseMove(UINT nFlags, CPoint point)
{
    UpdateRulersInfo(RW_POSITION, GetScrollPosition(), point);
    ...
    //Update vertical scroll range and position of the ruler
    void CDemoView::OnVScroll(UINT nSBCode, UINT nPos, 
                                    CScrollBar* pScrollBar)
    {
        UpdateRulersInfo(RW_VSCROLL, GetScrollPosition());
        ...
        //Update horizontal scroll range and position of the ruler
        void CDemoView::OnHScroll(UINT nSBCode, 
                    UINT nPos, CScrollBar* pScrollBar)
        {
            UpdateRulersInfo(RW_HSCROLL, GetScrollPosition());

and finally

void CDemoView::UpdateRulersInfo(int nMessage, CPoint ScrollPos, CPoint Pos)
{
    stRULER_INFO pRulerInfo;
    pRulerInfo.uMessage = nMessage;
    pRulerInfo.ScrollPos = ScrollPos;
    pRulerInfo.Pos = Pos;
    pRulerInfo.DocSize = m_ImageSize;
    pRulerInfo.fZoomFactor = m_fZoomFactor;
    
    //CMainFrame in SDI
    ((CMainFrame*)GetParentFrame())->UpdateRulersInfo(pRulerInfo);
    //CChildFrame in MDI
    ((CChildFrame*)GetParentFrame())->UpdateRulersInfo(pRulerInfo);
}