wxWidget mouse processing - c++

Question

I use wxWidget-3.1.4 under windows 10
I try to process mouse events from my class.
Header class:
#include "wx/wxprec.h"
#include <wx/wfstream.h>
class MainWindow : public wxFrame
{
public:
MainWindow(const wxString& title);
void OnQuit(wxCommandEvent& event);
void OnOpenImage(wxCommandEvent& WXUNUSED);
void OnEditImage(wxCommandEvent& WXUNUSED);
//will redirect mouse event to class ImageDrawing
void OnMouseWheel(wxMouseEvent& event);
void OnMouseMove(wxMouseEvent& event);
void OnMouseDown(wxMouseEvent& event);
void OnMouseUp(wxMouseEvent& event);
private:
//wx Panel for drawing image
wxPanel* m_background;
wxImage* m_Image;
...
};
Cpp file:
MainWindow::MainWindow(const wxString& title): wxFrame(NULL, wxID_ANY, title)
{
m_background = new wxPanel(this, wxID_ANY);
m_background->Bind(wxEVT_PAINT, &MainWindow::OnPaint, this);
}
void MainWindow::OnQuit(wxCommandEvent& WXUNUSED(event))
{
Close(true);
}
void MainWindow::OnOpenImage(wxCommandEvent& WXUNUSED(event))
{
wxString file = OpenFileDialog("Open Image file", "png files (*.png)|*.png");
openImage(file, true);
}
void MainWindow::OnEditImage(wxCommandEvent& WXUNUSED(event))
{
wxString file = OpenFileDialog("Open Image file", "png files (*.png)|*.png");
// some logic
}
void MainWindow::OnMouseWheel(wxMouseEvent& event)
{
std::cout<<"OnMouseWheel(event)";
}
void MainWindow::OnMouseMove(wxMouseEvent& event)
{
std::cout<<"OnMouseMove(event)";
}
void MainWindow::OnMouseDown(wxMouseEvent& event)
{
std::cout<<"OnMouseDown(event)";
}
void MainWindow::OnMouseUp(wxMouseEvent& event)
{
std::cout<<"OnMouseUp(event)";
}
wxBEGIN_EVENT_TABLE(MainWindow, wxFrame)
EVT_MENU(Minimal_Quit, MainWindow::OnQuit)
EVT_MENU(Open_Image, MainWindow::OnOpenImage)
EVT_MENU(Edit_Image, MainWindow::OnEditImage)
EVT_MOTION(MainWindow::OnMouseMove)
EVT_MOUSEWHEEL(MainWindow::OnMouseWheel)
EVT_LEFT_DOWN(MainWindow::OnMouseDown)
EVT_LEFT_UP(MainWindow::OnMouseUp)
EVT_RIGHT_DOWN(MainWindow::OnMouseDown)
EVT_RIGHT_UP(MainWindow::OnMouseUp)
wxEND_EVENT_TABLE()
the problem is that event menu works fine, also OnMouseWheel works, but all other mouse events are not working. Googling problem shows that a reason for this is because a parent component, in my case wxFrame is included some child, like wxPanel, and this child component could intercept events.
So why OnMouseWheel is working and all other is not. the same behaviour if I change wxFrame to wxPanel in event table and if I didn't use m_background.

Answer 1

I was able to solve this problem by applying the following changes in constructor:
MainWindow::MainWindow(const wxString& title): wxFrame(NULL, wxID_ANY, title)
{
m_background = new wxPanel(this, wxID_ANY);
m_background->Bind(wxEVT_PAINT, &MainWindow::OnPaint, this);
m_background->Connect(wxEVT_MOTION, wxMouseEventHandler(MainWindow::OnMouseMove));
m_background->Connect(wxEVT_LEFT_DOWN, wxMouseEventHandler(MainWindow::OnMouseDown));
m_background->Connect(wxEVT_LEFT_UP, wxMouseEventHandler(MainWindow::OnMouseUp));
}
in each function that if you want to access to some class member or parameter you need to do the following:
void MainWindow::OnMouseMove(wxMouseEvent& event)
{
MainWindow* pointer = dynamic_cast<MainWindow*>(this->GetParent());
if(pointer->m_path.size() > 0)
pointer->m_drawing->OnMove(event);
}
and instead of this, you need to use a pointer, the reason for this because this now point to m_background.
Last step is to delete this function from wx_EVENT_TABLE