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

Claudia Frank

Hello Yaron,

ok and yes SetWindowLongPtr() can be used.
I didn’t came across a windows api function which can’t be used with ctypes yet.
This is a toggle function which sets WS_EX_LAYOUTRTL if not set and unset
if was already set.

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


python_script_hwnd = None
python_script_sci_handle = None

GWL_EXSTYLE = -20
WS_EX_LAYOUTRTL = 0x00400000

def EnumCallback(hwnd, lparam):
    global python_script_hwnd
    global python_script_sci_handle
    
    curr_class = (wintypes.WCHAR * 256)()
    curr_name = (wintypes.WCHAR * 256)()
   
    windll.user32.GetClassNameW(hwnd, curr_class, 256)
    windll.user32.GetWindowTextW(hwnd, curr_name, 256)

    if curr_name.value.lower() == 'python script':
        python_script_hwnd = hwnd
    else:
        if python_script_hwnd is not None:
            if curr_class.value.lower() == 'scintilla':
                if windll.user32.GetParent(hwnd) == python_script_hwnd:
                    python_script_sci_handle = hwnd
                    return False
       
    return True

parent = windll.user32.FindWindowA('Notepad++', None)
windll.user32.EnumChildWindows(parent, WNDENUMPROC(EnumCallback), 0)
windll.user32.EnumChildWindows(python_script_hwnd, WNDENUMPROC(EnumCallback), 0)

exStyle = windll.user32.GetWindowLongA(python_script_sci_handle, GWL_EXSTYLE)

if (exStyle & WS_EX_LAYOUTRTL):
    exStyle = exStyle & WS_EX_LAYOUTRTL
else:
    exStyle = exStyle | WS_EX_LAYOUTRTL
windll.user32.SetWindowLongA(python_script_sci_handle, GWL_EXSTYLE, exStyle);

You have to use SetWindowLongPtr where I use Get/SetWindowLongA as
SetWindowLongPtr has not been transferred to wine.

Cheers
Claudia

Yaron

Hello Claudia,

Thank you very much. This is beautiful!

I get the AttributeError: function 'GetWindowLongPtr' not found error.
What should I import from ctypes?

BR

Claudia Frank

Hi Yaron,
you have to use either the ansi or unicode version

Unicode and ANSI names GetWindowLongPtrW (Unicode) and GetWindowLongPtrA (ANSI)

Same is true for Set…

Cheers
Claudia

Yaron

Hello again,

I get the same error.
No errors with Get/SetWindowLongA but the script doesn’t work. :)

Thank you.

Claudia Frank

Yaron

can you do an test output to the console (preferred last line of code) and run the script at least two times. Let me check about the Set/GetWindowLongPtrW.

Cheers
Claudia

Yaron

Claudia,

I had put the code in startup.py. I’ve now moved it to a separate script and run it twice.

default

can you do an test output to the console (preferred last line of code)

I’m not sure what you mean.

Aren’t you tired? Should we continue tomorrow? :)

Thank you.

Claudia Frank

Yaron,
no I meant using the GetWindowLongA as I did.
Btw. it looks like 32bit Python has to use GetWindowLong whereas 64bit Python
uses GetWindowLongPtr.

So make a normal script, use my code and print something to the console at the very end of the script just to see if the output is seen. If this is the case run another time and see if something changes. If so we have to change the logic about exstlye…

Cheers
Claudia

Yaron

It does write to the console.

If so we have to change the logic about exstlye…

Indeed. :)

Thank you.

Yaron

exStyle = exStyle & (~WS_EX_LAYOUTRTL)

I’m testing it.

Thank you.

Claudia Frank

Could you do me a favor and run the following script

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


python_script_hwnd = None
python_script_sci_handle = None

GWL_EXSTYLE = -20
WS_EX_LAYOUTRTL = 0x00400000

def EnumCallback(hwnd, lparam):
    global python_script_hwnd
    global python_script_sci_handle
    
    curr_class = (wintypes.WCHAR * 256)()
    curr_name = (wintypes.WCHAR * 256)()
   
    windll.user32.GetClassNameW(hwnd, curr_class, 256)
    windll.user32.GetWindowTextW(hwnd, curr_name, 256)
    console.write('name:{}\n'.format(curr_name.value.lower()))
    console.write('class:{}\n'.format(curr_class.value.lower()))
    if curr_name.value.lower() == 'python script':
        python_script_hwnd = hwnd
    else:
        if python_script_hwnd is not None:
            if curr_class.value.lower() == 'scintilla':
                if windll.user32.GetParent(hwnd) == python_script_hwnd:
                    python_script_sci_handle = hwnd
                    return False
       
    return True

parent = windll.user32.FindWindowA('Notepad++', None)
console.write('parent:{}\n'.format(parent))
windll.user32.EnumChildWindows(parent, WNDENUMPROC(EnumCallback), 0)
console.write('{}\n'.format('-'*20))
console.write('python_script_hwnd:{}\n'.format(python_script_hwnd))
windll.user32.EnumChildWindows(python_script_hwnd, WNDENUMPROC(EnumCallback), 0)

exStyle = windll.user32.GetWindowLongA(python_script_sci_handle, GWL_EXSTYLE) # GWL_EXSTYLE
console.write('exStyle:{}\n'.format(exStyle))

if (exStyle & WS_EX_LAYOUTRTL):
    console.write('exStyle & WS_EX_LAYOUTRTL:{}\n'.format(exStyle & WS_EX_LAYOUTRTL))
    exStyle = exStyle & WS_EX_LAYOUTRTL
else:
    console.write('exStyle | WS_EX_LAYOUTRTL:{}\n'.format(exStyle | WS_EX_LAYOUTRTL))
    exStyle = exStyle | WS_EX_LAYOUTRTL
windll.user32.SetWindowLongA(python_script_sci_handle, GWL_EXSTYLE, exStyle);
console.write('test\n')

and please post the output

Cheers
Claudia

Claudia Frank

Maybe XOR
exStyle = exStyle ^ WS_EX_LAYOUTRTL

Yaron

parent:11404816
name:selected tab
class:#32770
name:caption
class:button
name:
class:static
name:python script
class:#32770
name:parent:11404816
name:selected tab
class:#32770
name:caption
class:button
name:
class:static
name:python script
class:#32770

class:scintilla
--------------------
python_script_hwnd:4392424
name:parent:11404816
name:selected tab
class:#32770
name:caption
class:button
name:
class:static
name:python script
class:#32770
name:parent:11404816
name:selected tab
class:#32770
name:caption
class:button
name:
class:static
name:python script
class:#32770

c
class:scintilla
exStyle:4194304
exStyle & WS_EX_LAYOUTRTL:4194304
test

Both exStyle = exStyle & (~WS_EX_LAYOUTRTL) and exStyle = exStyle ^ WS_EX_LAYOUTRTL do change the the layout.

I have to clear the output first. Otherwise it’s gibberish.

Thank you.

Claudia Frank

Yaron,

this seems to be my waterloo in terms of understanding bitwise operations.
I always confuse when to use OR and when XOR.

So, just to clarify, this works?

if (exStyle & WS_EX_LAYOUTRTL):
    console.write('exStyle & WS_EX_LAYOUTRTL: {}\n'.format('exStyle & WS_EX_LAYOUTRTL'))
    exStyle = exStyle ^ WS_EX_LAYOUTRTL
else:
    console.write('exStyle | WS_EX_LAYOUTRTL:{}\n'.format(exStyle | WS_EX_LAYOUTRTL))
    exStyle = exStyle | WS_EX_LAYOUTRTL
windll.user32.SetWindowLongA(python_script_sci_handle, GWL_EXSTYLE, exStyle);
console.write('test\n')

Cheers
Claudia

Claudia Frank

and there seem to be a trap. The console changes it output only if something is
written to the output. So the initial state will be RTL until something gets written.

Cheers
Claudia

Yaron

So, just to clarify, this works?

Yes, it does.

and there seem to be a trap. The console changes it output only if something is
written to the output. So the initial state will be RTL until something gets written.

If I put the code in startup.py it doesn’t work even after writing to the console.

Thanks again. :)

Claudia Frank

Strange - works for me.
Could it be that you already have some ctypes based code in startup.py?
Variable overwriting?
May you share your startup.py?
Or maybe comment everything except the LTR code if you have already ctypes code.

Cheers
Claudia

Yaron

Claudia,

Strange - works for me.

Do you mean the output is RTL when you open the console?

I’ve removed my other code for testing it.

Actually I don’t need it on startup. I can write a “Show Console” script.

Thank you.

Claudia Frank

Do you mean the output is RTL when you open the console?

yes, on my side it is.

When I run a second time from my test script it doesn’t change until
another write statement happens, then it is back to LTR.

Cheers
Claudia

Yaron

Interesting.

May you share your startup.py?

I missed that. Sorry.

# The lines up to and including sys.stderr should always come first
# Then any errors that occur later get reported to the console
# If you'd prefer to report errors to a file, you can do that instead here.
import sys
from Npp import *

# Set the stderr to the normal console as early as possible, in case of early errors
sys.stderr = console

# Define a class for writing to the console in red
class ConsoleError:
	def __init__(self):
		global console
		self._console = console;

	def write(self, text):
		self._console.writeError(text);

# Set the stderr to write errors in red
sys.stderr = ConsoleError()

# This imports the "normal" functions, including "help"
import site

# This sets the stdout to be the currently active document, so print "hello world",
# will insert "hello world" at the current cursor position of the current document
sys.stdout = editor

##################################################


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

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


python_script_hwnd = None
python_script_sci_handle = None

GWL_EXSTYLE = -20
WS_EX_LAYOUTRTL = 0x00400000

def EnumCallback(hwnd, lparam):
    global python_script_hwnd
    global python_script_sci_handle
    
    curr_class = (wintypes.WCHAR * 256)()
    curr_name = (wintypes.WCHAR * 256)()
   
    windll.user32.GetClassNameW(hwnd, curr_class, 256)
    windll.user32.GetWindowTextW(hwnd, curr_name, 256)

    if curr_name.value.lower() == 'python script':
        python_script_hwnd = hwnd
    else:
        if python_script_hwnd is not None:
            if curr_class.value.lower() == 'scintilla':
                if windll.user32.GetParent(hwnd) == python_script_hwnd:
                    python_script_sci_handle = hwnd
                    return False
       
    return True

parent = windll.user32.FindWindowA('Notepad++', None)
windll.user32.EnumChildWindows(parent, WNDENUMPROC(EnumCallback), 0)
windll.user32.EnumChildWindows(python_script_hwnd, WNDENUMPROC(EnumCallback), 0)

exStyle = windll.user32.GetWindowLongA(python_script_sci_handle, GWL_EXSTYLE)

if (exStyle & WS_EX_LAYOUTRTL):
    console.write('exStyle & WS_EX_LAYOUTRTL: {}\n'.format('exStyle & WS_EX_LAYOUTRTL'))
    exStyle = exStyle ^ WS_EX_LAYOUTRTL
else:
    console.write('exStyle | WS_EX_LAYOUTRTL:{}\n'.format(exStyle | WS_EX_LAYOUTRTL))
    exStyle = exStyle | WS_EX_LAYOUTRTL
windll.user32.SetWindowLongA(python_script_sci_handle, GWL_EXSTYLE, exStyle);
console.write('test\n')

Thank you.

Yaron

When I run a second time from my test script it doesn’t change until
another write statement happens, then it is back to LTR.

On my machine it changes immediately. It’s gibberish until writing again.

Thanks.