[Python-Dev] (no subject) (original) (raw)

Robert Okadar aranea.network at gmail.com
Wed Apr 10 07:24:40 EDT 2019

Hi community,

I have developed a tkinter GUI component, Python v3.7. It runs very well in Linux but seeing a huge performance impact in Windows 10. While in Linux an almost real-time performance is achieved, in Windows it is slow to an unusable level.

The code is somewhat stripped down from the original, but the performance difference is the same anyway. The columns can be resized by clicking on the column border and dragging it. Resizing works only for the top row (but it resizes the entire column). In this demo, all bindings are avoided to exclude influence on the component performance and thus not included. If you resize the window (i.e., if you maximize it), you must call the function table.fit() from IDLE shell.

Does anyone know where is this huge difference in performance coming from? Can anything be done about it?

All the best,

Robert Okadar IT Consultant

Schedule an online meeting <https://calendly.com/aranea-network/60min> with me!

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import tkinter

class Resizer(tkinter.Frame): def init(self, info_grid, master, **cnf): self.table_grid = info_grid tkinter.Frame.init(self, master, **cnf) self.bind('', self.resize_column) self.bind('', self.resize_start) self.bind('', self.resize_end) self._resizing = False

    self.bind('<Destroy>', self.onDestroyEvent)

def onDestroyEvent(self, event):
    self.table_grid = []

def resize_column(self, event, width = None):
    #if self._resizing:
    top = self.table_grid.Top
    grid = self.table_grid._grid
    col = self.master.grid_info()["column"]
    if not width:
        width = self._width + event.x_root - self._x_root
    top.columnconfigure(col, minsize = width)
    grid.columnconfigure(col, minsize = width)
    

def resize_start(self, event):
    top = self.table_grid.Top
    self._resizing = True
    self._x_root = event.x_root
    col = self.master.grid_info()["column"]
    self._width = top.grid_bbox(row = 0, column = col)[2]
    #print event.__dict__
    
    col = self.master.grid_info()["column"]
    #print top.grid_bbox(row = 0, column = col)

def resize_end(self, event):
    pass
    #self.table_grid.xscrollcommand()
    #self.table_grid.column_resize_callback(col, self)

class Table(tkinter.Frame): def init(self, master, columns = 10, rows = 20, width = 100,**kw): tkinter.Frame.init(self, master, **kw) self.columns = [] self._width = width self._grid = grid = tkinter.Frame(self, bg = "#CCCCCC") self.Top = top = tkinter.Frame(self, bg = "#DDDDDD") self.create_top(columns) self.create_grid(rows)

    #self.bind('<Configure>', self.on_table_configure)
    #self.bind('<Map>', self.on_table_map)

    top.pack(anchor = 'nw')#, expand = 1, fill = "both")
    grid.pack(anchor = 'nw')#fill = "both",expand = 1

def on_table_map(self, event):
    theight = self.winfo_height()

def fit(self):#on_table_configure(self, event):
    i = 0
    for frame in self.Top.grid_slaves(row = 0):
        frame.resizer.resize_column(None, width = frame.winfo_width())
        i += 1
    theight = self.winfo_height()
    fheight = self._grid.winfo_height() + self.Top.winfo_height()
    #print('<Map>', theight, fheight)
    if theight > fheight:
        rheight = self.grid_array[0][0].winfo_height()
        ammount = int((-fheight + theight) / rheight)
        #print(rheight, ammount)
        for i in range(ammount):
            self.add_row()
            self.update()
    

def add_row(self, ammount = 1):
    columnsw = self.columns
    row = []
    i = len(self.grid_array)
    for j in range(len(columnsw)):
        bg = self.bgcolor0
        if i % 2 == 1:
            bg = self.bgcolor1
        entry = tkinter.Label(self._grid, bg = bg, text = '%i %i' % (i, j))
        entry.grid(row = i, column = j, sticky = "we", padx = 2)
        row.append(entry)
    self.grid_array.append(row)
    
    
bgcolor0 = "#FFFFFF"
bgcolor1 = "#EEEEEE"
def create_grid(self, height):
    
    #grid.grid(row = 0, column = 0, sticky = "nsew")
    
    columnsw = self.columns# = self.Top.grid_slaves(row = 1)
    self.grid_array = []
    for i in range(height):
        row = []
        for j in range(len(columnsw)):
            bg = self.bgcolor0
            if i % 2 == 1:
                bg = self.bgcolor1
            #entry = self.EntryClass(False, self, self._grid, bg = bg, width = 1, )
            entry = tkinter.Label(self._grid, bg = bg, text = '%i %i' % (i,j))
            entry.grid(row = i, column = j, sticky = "we", padx = 2)
            row.append(entry)
        self.grid_array.append(row)

def create_top(self, columns = 10):
    top = self.Top
    #columns = self._columns #maybe to rename
    for i in range(columns):
        name = 'column %i' % i
        self.add_column(name, top)
    

def add_column(self, name, top, width = None):
    if not width:
        width = self._width
    col = tkinter.Frame(top)
    i = len(self.columns)
    #filter = Filter(self, name, i, top)
    entry = tkinter.Entry(col, width = 1) #readonlybackground
    #col.ColumnIndex = i
    #col.array_index = i
    entry.insert(0, name)
    resizer = Resizer(self, col, bg = "#000000", width = 3, height = 21, cursor = 'sb_h_double_arrow')
    #entry.grid(row = 0, column = 0, sticky = "we")
    #resizer.grid(row = 0, column = 1, sticky = "e")
    entry.pack(side = "left", fill = "both", expand = 1)
    resizer.pack(side = "right")
    top.columnconfigure(i, minsize = width, weight = 1)
    #filter.grid(row = 0, column = i, sticky = "we")
    col.grid(row = 0, column = i, sticky = "we")
    col.entry = entry
    #col.filter = filter
    #col.index = filter.index = i
    col.resizer = resizer
    #filter.Column = col
    entry.Column = col
    self.columns.append(col)

if name == 'main': columns = 30 rows = 20 width = 60 root = tkinter.Tk() root.wm_title('TableGridTest') table = self = Table(root, columns = columns, rows = rows, width = width) table.pack(expand = 1, fill = 'both') #table.create_grid(

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