Catching the SCN_UPDATEUI event in Plugin

Thomas Knoefel

I’m trying to capture changes in Scintilla within a Notepad++ plugin. I have used the SCN_UPDATEUI notification to detect these changes within the WM_NOTIFY message, but it doesn’t seem to work. Regardless of the changes made to the document, the plugin never hits this event. I’m curious if this is even feasible from a plugin’s perspective. Here is my current approach:

Initialization of _hScintilla:

void initializeScintilla() {
    int which = -1;
    ::SendMessage(nppData._nppHandle, NPPM_GETCURRENTSCINTILLA, 0, (LPARAM)&which);
    if (which != -1) {
        _hScintilla = (which == 0) ? nppData._scintillaMainHandle : nppData._scintillaSecondHandle;
    }
}

Handler to catch event in _hScintilla:

case WM_NOTIFY:
{
    NMHDR* pnmh = (NMHDR*)lParam;

    if (pnmh->hwndFrom == _hScintilla) { 
        SCNotification* scn = (SCNotification*)lParam;
        if (scn->nmhdr.code == SCN_UPDATEUI) { 
            if (scn->updated & SC_UPDATE_SELECTION) { 
                MessageBox(_hSelf, L"Changed selection", L"Changed selection", MB_OK);
            }
        }
    }
}

Has anyone encountered a similar issue or successfully implemented this kind of event handling?

Michael Vincent

@Thomas-Knoefel said in Catching the SCN_UPDATEUI event in Plugin:

I have used the SCN_UPDATEUI notification to detect these changes within the WM_NOTIFY message, but it doesn’t seem to work.

Why not just do it the “plugin recommended way” (as per the Notepad++ example plugin):

extern "C" __declspec( dllexport ) void beNotified( SCNotification *notifyCode )
{
    switch (notifyCode->nmhdr.code)
    {
        case SCN_UPDATEUI:
        {
... do your stuff ...

...

Cheers.

Thomas Knoefel

@Michael-Vincent said in Catching the SCN_UPDATEUI event in Plugin:

Why not just do it the “plugin recommended way” (as per the Notepad++ example plugin):

Thxs, Michael. Your suggestion was exactly what I needed. It was simpler than I initially thought, yet I spent hours figuring it out.