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

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.

Claudia Frank

Yaron,

strange - might be linux/windows related.
I’ve copied your startup.py - cleaned mine (commented everything)
and now I have your behavior. Phew …

Yaron, it is already half past 4 here and I have to go to late shift today.
Need to have some sleep ;-) I will follow up on this in ~16 hours.
Maybe earlier if we don’t have to do much at work and I can have look.

Good night.
Cheers
Claudia

Yaron

Claudia,

Thank you very much. You are great!

default

Sorry for keeping you up so late.
Sleep well and have a nice day. :)

Claudia Frank

Thank you :-D

Did some last test - looks like it a
console.show()
before the code
and if you wish
console.hide()
afterwards does the trick.

Good night.

Cheers
Claudia

Yaron

Very nice.

Thanks again. Highly appreciated.

Good night. :)

Claudia Frank

Yaron,

did try to understand what the difference could be but …
While investigating the python script code I assume I found what needs to be changed in
order to force a LTR layout.

The file StaticDialog.cpp has a function makeRTLResource.
Within the function there is this if condition

if (pMyDlgTemplateEx->signature == 0xFFFF)
	pMyDlgTemplateEx->exStyle |= WS_EX_LAYOUTRTL;
else
	(*ppMyDlgTemplate)->dwExtendedStyle |= WS_EX_LAYOUTRTL;

what about giving a try to use

if (pMyDlgTemplateEx->signature == 0xFFFF)
	pMyDlgTemplateEx->exStyle;
else
	(*ppMyDlgTemplate)->dwExtendedStyle;

Yaron, sorry, I would love to see why our machines behave differently but without a debugging environment it’s hard to track down the issue maybe this little code change is a better alternative.

Cheers
Claudia

Yaron

Hello Claudia,

did try to understand what the difference could be but …
…
I would love to see why our machines behave differently but without a debugging environment it’s hard to track down the issue…

I apologize for not being clear enough in my last post.
In “Very nice” I meant to confirm the issue was solved by adding console.show(). :)

The file StaticDialog.cpp has a function makeRTLResource.
Within the function there is this if condition

Thank you very much for that too.
A couple of years ago Dave uploaded a PythonScript v1.1.1 without committing the changes.
As your script works perfectly, I’d rather keep using v1.1.1.

Many thanks again for your kind help. I do appreciate it.

Best regards.