jamieson wrote:
i.e. start out with a window like this:
[1][4][7]
[2][5][8]
[3][6][9]
make the main window larger and end up with this:
[1][6]
[2][7]
[3][8]
[4][9]
[5
Here's a solution, using Label widgets for clarity. The keys are:
* start numbering from zero, not one
* use divmod() on an item's index within the list to determine the
item's column/row position
* bind the Configure event for window resizing
# redo_layout.py
import sys
from Tkinter import *
CHAR_WIDTH = 10
PAD = 3
INIT_COL_COUNT = 3
def grid_positions(count, numcols):
return a generator for (colnum, rownum) position tuples,
given the total number of items and the number of columns
the first column is filled with items, then the second, etc.
numrows, rem = divmod(count, numcols)
# need an extra row if there was a remainder
if rem:
numrows += 1
# return value is a generator
return ( divmod(i, numrows) for i in range(count) )
def place_labels(event):
reposition all the items in the sequence label_list
# assumption: all labels have same width
label_width = label_list[0].winfo_width()
window_width = frm.winfo_width()
# calculate new column count
new_col_count = window_width // (label_width+PAD)
# get new position iterator
pos_iter = grid_positions(LABEL_COUNT, new_col_count)
# redo layout
for lab in label_list:
lab.grid_forget()
colnum, rownum = pos_iter.next()
lab.grid(column=colnum, row=rownum, padx=PAD, pady=PAD)
def create_labels(count):
create a list of Label items,
with text 1, 2, etc.
return [ Label(frm, bg='cyan', width=CHAR_WIDTH, text=%d % i)
for i in range(count) ]
if __name__ == __main__:
try:
LABEL_COUNT = int(sys.argv[1])
except (ValueError, IndexError):
print ERROR: Must specify number of labels
sys.exit(1)
# Tkinter window and whole-window Frame
root = Tk()
frm = Frame(root)
frm.pack(expand=True, fill=BOTH)
# create some labels
label_list = create_labels(LABEL_COUNT)
# perform initial layout
pos_iter = grid_positions(LABEL_COUNT, INIT_COL_COUNT)
for lab in label_list:
coloff, rowoff = pos_iter.next()
lab.grid(column=coloff, row=rowoff, padx=PAD, pady=PAD)
del pos_iter
# event configuration: redo the layout when the window size changes
frm.bind('Configure', place_labels)
# go
root.mainloop()
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