I provide here a stacked frame widget with possibility to use animation for the transition.
Python, 243 lines
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try:
from Tkinter import Frame, N, S, E, W
except ImportError:
from tkinter import Frame, N, S, E, W
class Animation(object):
def __init__(self, w, ticks, config_function, duration=1, interval_time=None, easing_function=None, start_value=0, end_value=1, callback=None):
self._w = w
self._tick = 0
self._total_ticks = float(ticks)
if easing_function is None:
self._easing_function = lambda x: x
self._duration = duration
if interval_time:
self._interval_time = int(interval_time * 1000)
else:
self._interval_time = int(duration * 1000 / self._total_ticks)
self._start_value = start_value
self._end_value = end_value
self._interval_value = end_value - start_value
self._config_function = config_function
self._callback = callback
def start_animation(self, after=0):
if after != 0:
self.after(int(after*1000), self._animate)
else:
self._animate()
def _animate(self):
t = self._tick / self._total_ticks
value = self._start_value + self._interval_value * self._easing_function(t)
self._config_function(value)
self._tick += 1
if self._tick <= self._total_ticks:
self._w.after(self._interval_time, self._animate)
else:
if self._callback is not None:
self._w.after(self._interval_time, self._callback)
class Stacked_Frame(Frame):
def __init__(self, master, animate=False, animate_direction=W, **kw):
Frame.__init__(self, master, **kw)
self._list_of_widgets = []
self._current_index = None
self._current_widget = None
self._animate = animate
if animate:
if animate_direction not in (E, W, N, S):
raise ValueError("Invalid animate_direction value: %s"%animate_direction)
self._animate_direction = animate_direction
self._is_animating = False
def add_widget(self, widget):
self._list_of_widgets.append(widget)
if self._current_index is None:
self._current_index = 0
self._show_widget(widget)
index = len(self._list_of_widgets) - 1
return index
def remove_widget(self, widget):
self._list_of_widgets.remove(widget)
def insert_widget(self, index, widget):
self._list_of_widgets.insert(index, widget)
if self._current_index is None:
self._current_index = 0
self._show_widget(widget)
def count(self):
return len(self._list_of_widgets)
def current_index(self):
return self._current_index
def index_of(self, widget):
return self._list_of_widgets.index(widget)
def set_current_index(self, index):
if self._is_animating:
return
if index == self._current_index: return
widget = self._list_of_widgets[index]
self._current_index = index
self._show_widget(widget)
def set_current_widget(self, widget):
if self._is_animating:
return
index = self._list_of_widgets.index(widget)
self._current_index = index
self._show_widget(widget)
def widget(self, index):
return self._list_of_widgets[index]
def next(self):
if self._current_index == len(self._list_of_widgets) - 1:
return
if self._is_animating:
return
self._current_index += 1
widget = self._list_of_widgets[self._current_index]
self._show_widget(widget)
def previous(self):
if not self._current_index:
return
if self._is_animating:
return
self._current_index -= 1
widget = self._list_of_widgets[self._current_index]
self._show_widget(widget)
def _show_widget(self, widget):
if self._current_widget is None:
self._current_widget = widget
widget.place(x=0, y=0, relwidth=1, relheight=1)
else:
if self._animate:
old_widget = self._current_widget
widget.place(relwidth=1, relheight=1)
if self._animate_direction == W:
start_value = 0
end_value = self.winfo_width()
def config_function(position):
widget.place(x=position, y=0, anchor=N+E)
old_widget.place(x=position, y=0, anchor=N+W)
elif self._animate_direction == E:
start_value = self.winfo_width()
end_value = 0
def config_function(position):
widget.place(x=position, y=0, anchor=N+W)
old_widget.place(x=position, y=0, anchor=N+E)
elif self._animate_direction == S:
start_value = 0
end_value = self.winfo_height()
def config_function(position):
widget.place(x=0, y=position, anchor=S+W)
old_widget.place(x=0, y=position, anchor=N+W)
elif self._animate_direction == N:
start_value = self.winfo_height()
end_value = 0
def config_function(position):
widget.place(x=0, y=position, anchor=N+W)
old_widget.place(x=0, y=position, anchor=S+W)
animation = Animation(
self,
ticks=20,
interval_time=0.05,
start_value=start_value,
end_value=end_value,
config_function=config_function,
callback=lambda widget=widget: self._on_finnish_animation(widget))
animation.start_animation()
self._is_animating = True
else:
self._current_widget.place_forget()
self._current_widget = widget
widget.place(x=0, y=0, relwidth=1, relheight=1)
def _on_finnish_animation(self, widget):
self._current_widget.place_forget()
self._current_widget = widget
self._is_animating = False
if __name__ == "__main__":
try:
from Tkinter import Tk, Button, Label
except ImportError:
from tkinter import Tk, Button, Label
root = Tk()
stack = Stacked_Frame(root, width=300, height=400, animate=True, animate_direction=S)
stack.pack(padx=5)
frame1 = Frame(stack, background="red")
Label(frame1, text="this is frame1").pack(expand=True)
frame2 = Frame(stack, background="white")
Label(frame2, text="this is frame2").pack(expand=True)
frame3 = Frame(stack, background="yellow")
Label(frame3, text="this is frame3").pack(expand=True)
frame4 = Frame(stack, background="green")
Label(frame4, text="this is frame4").pack(expand=True)
stack.add_widget(frame1)
stack.add_widget(frame2)
stack.add_widget(frame3)
stack.add_widget(frame4)
row = Frame(root)
row.pack(fill="x", pady=10, padx=5)
Button(row, text="previous", command= lambda: stack.previous()).pack(side="left")
Button(row, text="next", command= lambda: stack.next()).pack(side="left", padx=(8,0))
root.mainloop()
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