Python / Lua Script: Detect if a modifier is pressed when running a script

[Yaron]

Hello Claudia,

Thank you for the detailed explanation. I appreciate it.

So you need to have the keyboard logger registered within startup.py

I haven’t thoroughly learned the script yet.

If I have a bool altPressed in startup.py, I’d need to set it to false on Alt-UP only after some timeout. Is that correct?

BR

[Claudia Frank]

Yaron,
in your case, if I understand it correctly, I would use

    if msg in [WM_KEYDOWN, WM_SYSKEYDOWN]: 

to set the boolean true and

    elif msg in [WM_KEYUP,WM_SYSKEYUP]: 

to set it to false

and you need to handle the cases when alt together with other modifiers is pressed.

Cheers
Claudia

[Claudia Frank]

@Yaron

Detecting a right-click would be better (i.e. execute the script on both left/right-click and detect the button).

sorry, I missed this one.
So you do have defined a button in the toolbar, correct?
And when clicking with left mouse = normal run but when clicking with right mouse then advanced run?

Cheers
Claudia

[Yaron]

If I have a bool altPressed in startup.py, I’d need to set it to false on Alt-UP only after some timeout. Is that correct?

Or setting it to false only in the altDependentScript.
I’ll think about it.

You’ve been very helpful as always. :)
Thank you very much.

BR

[Claudia Frank]

Yaron, in case you want to get the mouse clicks see here.

Cheers and good night
Claudia

[Yaron]

Hello again Claudia,

Detecting a right-click would be better (i.e. execute the script on both left/right-click and detect the button).
…
sorry, I missed this one.
So you do have defined a button in the toolbar, correct?
And when clicking with left mouse = normal run but when clicking with right mouse then advanced run?

That’s correct.

in case you want to get the mouse clicks see here.

Getting the specific command/button position would be too much. :)

Thanks again. Highly appreciated.

Good night.

[dail]

As far as LuaScript goes you’d probably be alot more limited as you have to use what Scintilla/Notepad++ provides which you can catch double clicks and get the modifier keys but don’t think there’s a way to distinguish between left or right click. You could also register the same function with more than one keyboard shortcut, such as “F5”, “Ctrl+F5”, “Alt+F5”, etc…but this is not ideal.

Python gives more possibilities as far as interacting with the OS so this is probably your better option depending what you need exactly.

[Yaron]

Hello @dail,

Thank you for the additional info. I appreciate it.

If I understand it correctly, SCN_DOUBLECLICK is only relevant to the editor.
Double-click could have been useful, but I need it for a command or a toolbar button.

And thanks again for the great Lua Script plugin.
BTW, Ctrl+left-click to open the file instead of running the script could be a nice addition to Lua Script.
What do you think?

BR

[dail]

but I need it for a command or a toolbar button.

Oh! Now I see what you are doing. In this case PythonScript is your best option.

Ctrl+left-click to open the file instead of running the script could be a nice addition to Lua Script.

Honestly I don’t even know if would be possible. Since individual functions are registered instead of files, there is nothing that associates where a function is defined.

[Yaron]

Hello @dail,

Oh! Now I see what you are doing. In this case PythonScript is your best option.

A simple example for what I meant:
A script TypeLetter types a letter in the editor. Using Customize Toolbar, I’ve assigned a toolbar button to the script.
I want it to normally type A but if Alt is down when pressing the toolbar button type B.

Claudia’s suggestion is a good option, but I think I’d have to use some timeout.
Using another script Toggle TypeLetter Mode is another option which should work well in Lua Script too.

Since individual functions are registered instead of files…

I didn’t think about that. :)

Thanks again.
BR

[Claudia Frank]

Hello Yaron

a quick script about what I meant with mouse click capture.

In one script you intercept the window proc (needs to be called first, startup.py might be good choice)

from ctypes import windll, byref, wintypes, WINFUNCTYPE, Structure, sizeof

WndProcType = WINFUNCTYPE(wintypes.LONG,
                          wintypes.HWND,
                          wintypes.UINT,
                          wintypes.WPARAM,
                          wintypes.LPARAM)
GWL_WNDPROC = -4

WNDENUMPROC = WINFUNCTYPE(wintypes.BOOL,
                          wintypes.HWND,
                          wintypes.LPARAM)


_g = globals()
CAPTURE_MOUSE_CLICK = _g.get('CAPTURE_MOUSE_CLICK', False)
OLD_WND_PROC = _g.get('OLD_WND_PROC', None)
LEFT_MOUSE_CLICK_MOD = False

class Hook():

    def EnumCallback(self, hwnd, lparam):
        curr_class = (wintypes.WCHAR * 256)()
        windll.user32.GetClassNameW(hwnd, curr_class, 256)
        if curr_class.value.lower() == 'toolbarwindow32':
            self.toolbar_handle = hwnd
            return False
        return True

    def __init__(self):
        self.toolbar_handle = None
        parent = windll.user32.FindWindowA('Notepad++',None)
        windll.user32.EnumChildWindows(parent, WNDENUMPROC(self.EnumCallback), 0)

        self.oldWndProc = None

        self.SHIFT_PRESSED = False
        self.CTRL_PRESSED = False
        self.ALT_PRESSED = False

    def register(self):
        if self.toolbar_handle:
            self.new_wnd_proc = WndProcType(self.sciWndProc)
            windll.kernel32.SetLastError(0)
            self.oldWndProc = windll.user32.SetWindowLongA(self.toolbar_handle, GWL_WNDPROC, self.new_wnd_proc)

            if self.oldWndProc:
                global OLD_WND_PROC
                OLD_WND_PROC = self.oldWndProc
            else:
                _err = 'GetLastError:{}'.format(windll.kernel32.GetLastError())
                notepad.messageBox('Could not register hook:\n{}\n'.format(_err) +
                                    'Shortcuts won\'t work',
                                    'Register Hook Failure', 0)
        else:
            console.write('no toolbar_handle found')

    def unregister(self):
        if OLD_WND_PROC:
            self.oldWndProc = OLD_WND_PROC
            windll.kernel32.SetLastError(0)
            dummy = windll.user32.SetWindowLongA(self.toolbar_handle, GWL_WNDPROC, self.oldWndProc)
            if not dummy:
                _err = 'GetLastError:{}'.format(windll.kernel32.GetLastError())
                notepad.messageBox('Could not unregister hook:\n{}\n'.format(_err) +
                                    'It is recommended to save data and restart npp to prevent data loss',
                                    'Unregister Hook Failure', 0)

        else:
            console.write('ERROR no saved window proc found')

    def sciWndProc(self, hWnd, msg, wParam, lParam):
        if msg == 0x0201: # WM_LBUTTONDOWN
            global LEFT_MOUSE_CLICK_MOD
            if wParam == 5: # 0x0001 LButton + 0x0004 Shift
                console.write('left mouse click while holding shift\n')
                LEFT_MOUSE_CLICK_MOD = True
            else:
                console.write('left mouse click\n')
                LEFT_MOUSE_CLICK_MOD = False

        return windll.user32.CallWindowProcA (self.oldWndProc, hWnd, msg, wParam, lParam)

# -----------------------------------------------------------------------------
_hook = Hook()
if not CAPTURE_MOUSE_CLICK:
    _hook.register()
    CAPTURE_MOUSE_CLICK = True
    console.write('registered')
else:
    _hook.unregister()
    CAPTURE_MOUSE_CLICK = False
    console.write('unregistered')

in another script something like

import datetime
print datetime.datetime.now()
print 'LEFT_MOUSE_CLICK_MOD:{}'.format(LEFT_MOUSE_CLICK_MOD)

The first script gets the handle of the toolbar and hooks it message queue.
Once you click a button the global variable is set and the second script gets executed.

Cheers
Claudia

[Yaron]

Hello Claudia,

Sorry for the late reply. I was not by my PC.
And thank you for the beautiful script. I appreciate your kindness.

Now that you capture both the click and the modifier, there’s no need to use timeout and it works like a charm.

Two follow-up questions with your permission:

1. Customize Toolbar inserts a separator on pressing Shift and left-clicking a toolbar button.
   Which module should I import in order to use GetKeyState() and detect Alt?

2. The little programming experience I have is from Firefox.
   In that browser adding a right-click functionality to a toolbar button is done as follows:

• Get A specific toolbar button object.
• Add a click listener to that button and assign your own action to right-click.

I suppose this procedure would be more complex in NPP.

Actually you can replace in your script

if wParam == 5: # 0x0001 LButton + 0x0004 Shift

with

if wParam == 3: # 0x0001 LButton + 0x0002 MK_RBUTTON

and then if you hold the right button down and left-click - you can execute the script in “alternative mode”.

---

Another simple (and not as elegant) way to run a script in two modes:
In startup (py or lua) add testScriptDefaultMode = True.
Create a script Toggle TestScript Default Mode containing two lines:

global testScriptDefaultMode 
testScriptDefaultMode = not testScriptDefaultMode 

In TestScript check if testScriptDefaultMode:.

Assign a simple shortcut (e.g. Alt+Spacebar) to Toggle TestScript Default Mode and use it to quickly toggle the modes…

---

Thanks again.
Have a nice weekend.

[Claudia Frank]

@Yaron

Customize Toolbar inserts a separator on pressing Shift and left-clicking a toolbar button.
Which module should I import in order to use GetKeyState() and detect Alt?

The function is also called GetKeyState and is in user32.dll.
You need to provide the virtual key code to get the state, so something like

alt_state = windll.user32.GetKeyState(0x12)

but using wine, I was not able to press alt and do left click with mouse.
Would be interesting to see if this works on Windows.

The little programming experience I have is from Firefox.
In that browser adding a right-click functionality to a toolbar button is done as follows:
Get A specific toolbar button object.
Add a click listener to that button and assign your own action to right-click.
I suppose this procedure would be more complex in NPP.

I think so too. Out of my mind, you would need to find notepad++ window handle,
enumerate child windows to get toolbar, enumerate toolbar child windows to get
the button in question (not sure how to identify), register a function which hooks into
buttons message queue and I don’t know what happens if another program accesses toolbar
to modify (or add/delete) a button?? I’m pretty sure it can be done but I’m not convinced
it should be done.

Another possible solution to run script in alternate mode would be to use a
inputbox (prompt method) ;-) (also not as elegant but most painless version) :-D

Cheers
Claudia

[Yaron]

Hello Claudia,

The function is also called GetKeyState and is in user32.dll.

Great. Thank you.

but using wine, I was not able to press alt and do left click with mouse.
Would be interesting to see if this works on Windows.

alt_state = windll.user32.GetKeyState(0x12)
if alt_state < 0:

Works perfectly.

Out of my mind, you would need to find notepad++ window handle…

Your confirmation that this is indeed rather complex is important.

Another possible solution to run script in alternate mode would be to use a
inputbox

So I have multiple choices now. :)
Being a “mouse-oriented” user, your script detecting if the right button was down when left-clicking would probably fit me best.

Thanks again for your time and clever ideas. I do appreciate it.
BR

[Scott Sumner]

@Yaron and @Claudia-Frank

Oftentimes I find myself writing a Pythonscript that either acts on text above the caret or below the caret. So I need a way to tell it which way to go. An input box would work, but it slows down one’s “workflow”. Often it is an alternate but related keypress (e.g. F10 runs functionality above the caret, Shift+F10 for below the caret) that I want to use. So what I’ve been doing is having 3 scripts, one “common” one, and two others. The two others are tied to F10 and Shift+F10, and call the common script, telling it the direction.

So I just wanna say that this thread has gotten me thinking about how to do this cleaner; haven’t done anything about it yet, but definitely thinkin’… :-D

[Yaron]

Hello Scott,

It’s good to know an experienced “Pythoneer” like yourself have been coping with this issue.
Our Claudia is really clever, isn’t she? :)

Please share with us your preferred solution.

Best regards.

[Alan Kilborn]

@Scott-Sumner
I don’t know that this thread will be of any help for that kind of key differentiation. I do see how it might work with a toolbar button assigned to a pythonscript, though, but this seems like it isn’t what you want.

[Yaron]

Hello Claudia and all,

Thanks again for the script. I appreciate it.

I’ve slightly modified it so that right-clicking a toolbar button would execute its command.
Emulating the regular left-click behavior:

• When the right button is down, the toolbar button is “checked”.
  
• The command is executed only when the right button is released.

If anyone can think of a better way to achieve that behavior, please let me know.

---

from ctypes import windll, byref, wintypes, WINFUNCTYPE, Structure, sizeof

WndProcType = WINFUNCTYPE(wintypes.LONG,
                          wintypes.HWND,
                          wintypes.UINT,
                          wintypes.WPARAM,
                          wintypes.LPARAM)
                          
GWL_WNDPROC = -4

WNDENUMPROC = WINFUNCTYPE(wintypes.BOOL,
                          wintypes.HWND,
                          wintypes.LPARAM)


_g = globals()
CAPTURE_MOUSE_CLICK = _g.get('CAPTURE_MOUSE_CLICK', False)
OLD_WND_PROC = _g.get('OLD_WND_PROC', None)

RIGHT_CLICK_MODE = False
REAL_RIGHT_UP = False

class Hook():

    def EnumCallback(self, hwnd, lparam):
        curr_class = (wintypes.WCHAR * 256)()
        windll.user32.GetClassNameW(hwnd, curr_class, 256)
        if curr_class.value.lower() == 'toolbarwindow32':
            self.toolbar_handle = hwnd
            return False
            
        return True

    def __init__(self):
        self.toolbar_handle = None
        parent = windll.user32.FindWindowA('Notepad++', None)
        windll.user32.EnumChildWindows(parent, WNDENUMPROC(self.EnumCallback), 0)

        self.oldWndProc = None

    def register(self):
        if self.toolbar_handle:
            self.new_wnd_proc = WndProcType(self.sciWndProc)
            windll.kernel32.SetLastError(0)
            self.oldWndProc = windll.user32.SetWindowLongA(self.toolbar_handle, GWL_WNDPROC, self.new_wnd_proc)

            if self.oldWndProc:
                global OLD_WND_PROC
                OLD_WND_PROC = self.oldWndProc
            else:
                _err = 'GetLastError:{}'.format(windll.kernel32.GetLastError())
                notepad.messageBox('Could not register hook:\n{}\n'.format(_err) +
                                    'Right-click mode won\'t work',
                                    'Register Hook Failure', 0)
        else:
            console.write('no toolbar_handle found')

    def unregister(self):
        if OLD_WND_PROC:
            self.oldWndProc = OLD_WND_PROC
            windll.kernel32.SetLastError(0)
            dummy = windll.user32.SetWindowLongA(self.toolbar_handle, GWL_WNDPROC, self.oldWndProc)
            if not dummy:
                _err = 'GetLastError:{}'.format(windll.kernel32.GetLastError())
                notepad.messageBox('Could not unregister hook:\n{}\n'.format(_err) +
                                    'It is recommended to save data and restart npp to prevent data loss',
                                    'Unregister Hook Failure', 0)

        else:
            console.write('ERROR no saved window proc found')


	def sciWndProc(self, hWnd, msg, wParam, lParam):
		global REAL_RIGHT_UP
		global RIGHT_CLICK_MODE
		if msg == 0x0204:		# WM_RBUTTONDOWN.
			REAL_RIGHT_UP = False
			windll.user32.mouse_event(0x0002, 0, 0, 0, 0)	# Left down. WM_RBUTTONUP is sent although the right button is still down.
		elif msg == 0x0205:	# WM_RBUTTONUP.
			if REAL_RIGHT_UP:		# Another WM_RBUTTONUP is sent when the right button is released. Process it now.
				RIGHT_CLICK_MODE = True
				windll.user32.mouse_event(0x0004, 0, 0, 0, 0)	# Left up.
				windll.user32.SetTimer(hWnd, 1, 1000, 0);	# 1 == TIMER_ID.

			REAL_RIGHT_UP = True
		elif msg == 0x0113 and wParam == 1:		# WM_TIMER.
			RIGHT_CLICK_MODE = False
			windll.user32.KillTimer(hWnd, 1);

		return windll.user32.CallWindowProcA (self.oldWndProc, hWnd, msg, wParam, lParam)
# -----------------------------------------------------------------------------

_hook = Hook()
if not CAPTURE_MOUSE_CLICK:
    _hook.register()
    CAPTURE_MOUSE_CLICK = True
    console.write('registered')
else:
    _hook.unregister()
    CAPTURE_MOUSE_CLICK = False
    console.write('unregistered')

Copy and paste the code in startup.py.
In a script you want to run in two modes, (i.e. left-click and right-click) add modeRightClick = RIGHT_CLICK_MODE and handle it accordingly.
Since a 1 Sec timer is set to revert RIGHT_CLICK_MODE to False, it’s recommended to add modeRightClick = RIGHT_CLICK_MODE at the beginning of the script.

Best regards.

[Claudia Frank]

@Yaron

so you are concerned not seeing the pressed/checked button if right clicking on it, aren’t you?

Cheers
Claudia

[Claudia Frank]

@Yaron

here my solution, not fully error proved and just added without any structure
but I guess you get the point.

You need to import another 4 types from ctypes (pointer, c_ubyte, c_int, c_ulong)
The changed part is

def sciWndProc(self, hWnd, msg, wParam, lParam):
    if msg == 0x0201: #0x0201: # WM_LBUTTONDOWN
        global LEFT_MOUSE_CLICK_MOD
        if wParam == 5: # 0x0001 LButton + 0x0004 Shift
            console.write('left mouse click while holding shift\n')
            LEFT_MOUSE_CLICK_MOD = True
        else:
            console.write('left mouse click\n')
            
    elif msg == 0x0204:
            class TBBUTTON(Structure):
                _fields_ = [
                            ('iBitmap', c_int),
                            ('idCommand', c_int),
                            ('fsState', c_ubyte),
                            ('fsStyle', c_ubyte),
                            ('bReserved', c_ubyte * 6), # 2 if win32
                            ('dwData', c_ulong),
                            ('iString', c_int),
                           ]
                
            LEFT_MOUSE_CLICK_MOD = False
            _point = wintypes.POINT()
            result = windll.user32.GetCursorPos(byref(_point))
            if result:
                _hwnd = windll.user32.WindowFromPoint(_point)
                windll.user32.ScreenToClient(_hwnd,pointer(_point))
                button_id = windll.user32.SendMessageA(_hwnd,
                                                       1024+69, # TB_HITTEST(WM_USER + 69)
                                                       0, 
                                                       pointer(_point))

                
                _tbbutton = TBBUTTON()
                bool = windll.user32.SendMessageA(_hwnd,
                                                  1024+23, # TB_GETBUTTON(WM_USER + 23))
                                                  button_id, 
                                                  byref(_tbbutton))
                
                
                if bool:
                    pressed = windll.user32.SendMessageA(_hwnd,
                                                         1024+2, # TB_CHECKBUTTON(WM_USER + 2)
                                                         _tbbutton.idCommand, 
                                                         True)

    return windll.user32.CallWindowProcA (self.oldWndProc, hWnd, msg, wParam, lParam)

Seems to work on linux, so should work on windows as well.

Cheers
Claudia