Visual C++ How to override event handler of parant class? - c++

Question

I need to override event wm_lbuttonup of CMFCRibbonSlider class
class CMyRibbonSlider : public CMFCRibbonSlider
{
public:
virtual void OnLButtonUp(CPoint point); // need this event handler!
};
void CMyRibbonSlider::OnLButtonUp(CPoint point)
{
AfxMessageBox(_T("Works!"))
return;
}
Use CMyRibbonSlider object in MainFrame class
class CMainFrame : public CMDIFrameWndEx
{
....
CMyRibbonSlider* SliderLine;
}
When CMFCRibbonSlider control apears and I click left mousebutton, nothing happens. What do I do wrong?
EDIT:
initialization
CArray<CMFCRibbonBaseElement*, CMFCRibbonBaseElement*> ar;
m_wndRibbonBar.GetElementsByID(ID_SLIDER2, RibbonElementsArray);
m_wndRibbonBar.GetElementsByID(ID_START_BTN, ar);
RibbonElementsArray.Append(ar);
m_wndRibbonBar.GetElementsByID(ID_STOP_BTN, ar);
RibbonElementsArray.Append(ar);
m_wndRibbonBar.GetElementsByID(ID_SLIDER_LINE, ar); //HERE!
RibbonElementsArray.Append(ar);
m_wndRibbonBar.GetElementsByID(IDC_STATIC_TT, ar);
RibbonElementsArray.Append(ar);
Slider = DYNAMIC_DOWNCAST(CMFCRibbonSlider, RibbonElementsArray[0]);
btnStart = DYNAMIC_DOWNCAST(CMFCRibbonButton, RibbonElementsArray[1]);
btnStop = DYNAMIC_DOWNCAST(CMFCRibbonButton, RibbonElementsArray[2]);
SliderLine = (CMyRibbonSlider*)DYNAMIC_DOWNCAST(CMFCRibbonSlider, RibbonElementsArray[3]); //and HERE!
TmpLable = DYNAMIC_DOWNCAST(CMFCRibbonLabel, RibbonElementsArray[4]);
also I have these event handlers in Mainframe class and they work:
ON_UPDATE_COMMAND_UI(ID_SLIDER_LINE, &CMainFrame::OnUpdateSliderLine)
ON_COMMAND(ID_SLIDER_LINE, &CMainFrame::OnSliderLine)
SliderLine->GetPos() also returns right slider position, so I think initialization is right...

Answer 1

It is seem like the CMFCRibbonSlider control isn't added correctly to CMFCRibbonPanel and therefore CMainFrame class does not expose slider’s messages through message map.
Try to use a method described in the following article:
Walkthrough: Creating a New Ribbon Application By Using MFC
The code will be look like below.
MyRibbonSlider.h
#include "afxribbonslider.h"
#pragma once
class CMyRibbonSlider : public CMFCRibbonSlider
{
DECLARE_DYNCREATE(CMyRibbonSlider)
public:
CMyRibbonSlider();
CMyRibbonSlider(UINT nID, int nWidth = 100);
// Implementation
public:
virtual ~CMyRibbonSlider();
virtual void OnLButtonUp(CPoint point);
};
MyRibbonSlider.cpp
#include "stdafx.h"
#include "MyRibbonSlider.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#endif
IMPLEMENT_DYNCREATE(CMyRibbonSlider, CMFCRibbonSlider)
CMyRibbonSlider::CMyRibbonSlider()
{
}
CMyRibbonSlider::CMyRibbonSlider(UINT nID, int nWidth)
: CMFCRibbonSlider(nID, nWidth)
{
}
CMyRibbonSlider::~CMyRibbonSlider()
{
}
void CMyRibbonSlider::OnLButtonUp(CPoint point)
{
TRACE("\nCMyRibbonSlider::OnLButtonUp()");
return;
}
Related declarations in the CMainFrame.h
afx_msg void OnSliderLine();
afx_msg void OnUpdateSliderLine(CCmdUI* pCmdUI);
CMainFrame.cpp
BEGIN_MESSAGE_MAP(CMainFrame, CMDIFrameWndEx)
...
ON_COMMAND(ID_SLIDER, &CMainFrame::OnSliderLine)
ON_UPDATE_COMMAND_UI(ID_SLIDER, &CMainFrame::OnUpdateSliderLine)
END_MESSAGE_MAP()
void CMainFrame::InitializeRibbon()
{
...
bNameValid = strTemp.LoadString(*your title*);
ASSERT(bNameValid);
CMFCRibbonPanel* pPanelAdvanced = pCategoryHome->AddPanel(strTemp, m_PanelImages.ExtractIcon (*your icon*));
strTemp = _T("Slider");
CMyRibbonSlider* pRibbonSlider = new CMyRibbonSlider(ID_SLIDER);
pPanelAdvanced->Add(pRibbonSlider);
...
}
void CMainFrame::OnSliderLine()
{
// TODO
}
void CMainFrame::OnUpdateSliderLine(CCmdUI* pCmdUI)
{
// TODO
}