| 389 | self.master.master.focus_force() |
| 390 | |
| 391 | def update_state(self): |
| 392 | browser = self.master.get_browser() |
| 393 | if not browser: |
| 394 | if self.back_state != tk.DISABLED: |
| 395 | self.back_button.config(state=tk.DISABLED) |
| 396 | self.back_state = tk.DISABLED |
| 397 | if self.forward_state != tk.DISABLED: |
| 398 | self.forward_button.config(state=tk.DISABLED) |
| 399 | self.forward_state = tk.DISABLED |
| 400 | self.after(100, self.update_state) |
| 401 | return |
| 402 | if browser.CanGoBack(): |
| 403 | if self.back_state != tk.NORMAL: |
| 404 | self.back_button.config(state=tk.NORMAL) |
| 405 | self.back_state = tk.NORMAL |
| 406 | else: |
| 407 | if self.back_state != tk.DISABLED: |
| 408 | self.back_button.config(state=tk.DISABLED) |
| 409 | self.back_state = tk.DISABLED |
| 410 | if browser.CanGoForward(): |
| 411 | if self.forward_state != tk.NORMAL: |
| 412 | self.forward_button.config(state=tk.NORMAL) |
| 413 | self.forward_state = tk.NORMAL |
| 414 | else: |
| 415 | if self.forward_state != tk.DISABLED: |
| 416 | self.forward_button.config(state=tk.DISABLED) |
| 417 | self.forward_state = tk.DISABLED |
| 418 | self.after(100, self.update_state) |
| 419 | |
| 420 | |
| 421 | class Tabs(tk.Frame): |