I have managed to mangle together a program that takes a strings over multiple lines and prints them onto a transparent background. I wanted to know if there is a way to colour individual parts of the string different colours. I know there is but my lack of understanding of win32 is really getting in my way here. Do I need to split the text into two parts and make a call to drawText() or can I can the text colour be changed half way through the string? Any point towards a information or a solution would be great.
example: string = "Username: some message that the user has sent."
I have searched on Stack and multiple other sites and have had no joy as of yet. I usually wouldn't but I have dumped the code as it can be run and you can see what I mean.
I apologise in advance for the lack of comments and the state of the code.
import win32api
import win32con
import win32gui
import time
import threading
from collections import deque
userAndMessage = deque()
def queue(message):
userAndMessage.append(message)
def getQueue():
return userAndMessage;
def dequeue():
return userAndMessage.popleft()
def cleanMessage(message):
return message.split("\r\n")[0]
def showMessages():
return userAndMessage[0] + "\n" + userAndMessage[1] + "\n" +
userAndMessage[2] + "\n" + userAndMessage[3] + "\n" + userAndMessage[4]
#Code example modified from:
#Christophe Keller
#Hello World in Python using Win32
windowText = ''
def main():
#get instance handle
hInstance = win32api.GetModuleHandle()
# the class name
className = 'SimpleWin32'
# create and initialize window class
wndClass = win32gui.WNDCLASS()
wndClass.style = win32con.CS_HREDRAW | win32con.CS_VREDRAW
wndClass.lpfnWndProc = wndProc
wndClass.hInstance = hInstance
wndClass.hCursor = win32gui.LoadCursor(None, win32con.IDC_ARROW)
wndClass.hbrBackground = win32gui.GetStockObject(win32con.WHITE_BRUSH)
wndClass.lpszClassName = className
# register window class
wndClassAtom = None
try:
wndClassAtom = win32gui.RegisterClass(wndClass)
except Exception as e:
print (e)
raise e
exStyle = win32con.WS_EX_COMPOSITED | win32con.WS_EX_LAYERED |
win32con.WS_EX_NOACTIVATE | win32con.WS_EX_TOPMOST |
win32con.WS_EX_TRANSPARENT
style = win32con.WS_DISABLED | win32con.WS_POPUP | win32con.WS_VISIBLE
hWindow = win32gui.CreateWindowEx(
exStyle,
wndClassAtom,
None, # WindowName
style,
20, # x
900, # y
1920, # width
600, # height
None, # hWndParent
None, # hMenu
hInstance,
None # lpParam
)
# Show & update the window
win32gui.SetLayeredWindowAttributes(hWindow, 0x00ffffff, 255,
win32con.LWA_COLORKEY | win32con.LWA_ALPHA)
win32gui.SetWindowPos(hWindow, win32con.HWND_TOPMOST, 0, 0, 0, 0,
win32con.SWP_NOACTIVATE | win32con.SWP_NOMOVE | win32con.SWP_NOSIZE
| win32con.SWP_SHOWWINDOW)
win32gui.ShowWindow(hWindow, win32con.SW_SHOWNORMAL)
win32gui.UpdateWindow(hWindow)
# New code: Create and start the thread
thr = threading.Thread(target=customDraw, args=(hWindow,))
thr.setDaemon(False)
thr.start()
# Dispatch messages
win32gui.PumpMessages()
# New code: Attempt to change the text 1 second later
def customDraw(hWindow):
strOne = "SomeUser: This is test line one"
strTwo = "SomeOtherUser: This is test line two"
strThree = "AndAnother: This is test line three"
strFour = "UserOne: This is test line four"
strFive = "AndAgain: This is test line five"
queue(strOne)
queue(strTwo)
queue(strThree)
queue(strFour)
queue(strFive)
global windowText
windowText = showMessages()
win32gui.RedrawWindow(hWindow, None, None, win32con.RDW_INVALIDATE |
win32con.RDW_ERASE)
def wndProc(hWnd, message, wParam, lParam):
if message == win32con.WM_PAINT:
hDC, paintStruct = win32gui.BeginPaint(hWnd)
fontSize = 26
lf = win32gui.LOGFONT()
lf.lfFaceName = "Stencil"
lf.lfHeight = fontSize
lf.lfWeight = 600
lf.lfQuality = win32con.NONANTIALIASED_QUALITY
hf = win32gui.CreateFontIndirect(lf)
win32gui.SelectObject(hDC, hf)
win32gui.SetTextColor(hDC,win32api.RGB(240,0,50))
rect = win32gui.GetClientRect(hWnd)
win32gui.DrawText(hDC,windowText,-1, rect, win32con.DT_CALCRECT);
win32gui.DrawText(
hDC,
windowText,
-1,
rect,
win32con.DT_NOCLIP | win32con.DT_VCENTER |
win32con.DT_EXPANDTABS
)
win32gui.EndPaint(hWnd, paintStruct)
return 0
elif message == win32con.WM_DESTROY:
print('Being destroyed')
win32gui.PostQuitMessage(0)
return 0
else:
return win32gui.DefWindowProc(hWnd, message, wParam, lParam)
if __name__ == '__main__':
main()
there may be some indentation out of line, this is not the case in the program its just that I had to press the spacebar 4 times on each line of text.
Thanks
Yes, you have to use SetTextColor to change the color before calling DrawText
You are correctly calling DrawText with DT_CALCRECT option. This doesn't draw anything, it just calculates the height of the rectangle (based on width...) Python's DrawText will return a tuple for the calculated rectangle.
Then call DrawText again, with the same text format, without DT_CALCRECT flag. Then offset the rectangle, change color, and draw the next text.
Note, this can get very messy in pywin32, it might be easier to try it out in C/C++ first.
if message == win32con.WM_PAINT:
hDC, paintStruct = win32gui.BeginPaint(hWnd)
fontSize = 16
lf = win32gui.LOGFONT()
lf.lfFaceName = "Stencil"
lf.lfHeight = fontSize
lf.lfWeight = 600
lf.lfQuality = win32con.NONANTIALIASED_QUALITY
hf = win32gui.CreateFontIndirect(lf)
win32gui.SelectObject(hDC, hf)
text1 = 'line1'
text2 = 'line2'
text3 = 'line3'
rect = win32gui.GetClientRect(hWnd)
textformat = win32con.DT_LEFT | win32con.DT_TOP
win32gui.SetTextColor(hDC,win32api.RGB(255,0,0))
drawrect = win32gui.DrawText(hDC, text1, -1, rect, textformat | win32con.DT_CALCRECT);
win32gui.DrawText(hDC, text1, -1, rect, textformat)
l = drawrect[1][0]
t = drawrect[1][1]
r = drawrect[1][2]
b = drawrect[1][3]
height = b - t
rect = (l, t + height, r, b + height)
win32gui.SetTextColor(hDC,win32api.RGB(0,255,0))
drawrect = win32gui.DrawText(hDC, text2, -1, rect, textformat | win32con.DT_CALCRECT);
win32gui.DrawText(hDC, text2, -1, rect, textformat)
l = drawrect[1][0]
t = drawrect[1][1]
r = drawrect[1][2]
b = drawrect[1][3]
height = b - t
rect = (l, t + height, r, b + height)
win32gui.SetTextColor(hDC,win32api.RGB(0,0,255))
drawrect = win32gui.DrawText(hDC, text3, -1, rect, textformat | win32con.DT_CALCRECT);
win32gui.DrawText(hDC, text3, -1, rect, textformat)
win32gui.EndPaint(hWnd, paintStruct)
return 0