无法滚动到 TreeView PyGTK / GTK 的末尾
当我尝试向下滚动到 TreeView 的末尾（位于 ScrolledWindow 内）时，它不会滚动到应该滚动的位置，而是滚动到前面的一两行。
我尝试了几种方法，它们都提供相同的行为：
self.wTree.get_widget("tree_last_log").scroll_to_cell((self.number_results-1,))
# or
self.wTree.get_widget("tree_last_log").set_cursor((self.number_results-1,))
# or
adj = self.wTree.get_widget("scrolledwindow1").get_vadjustment()
adj.set_value(adj.get_property('upper'))
self.wTree.get_widget("scrolledwindow1").set_vadjustment(adj)
# or
self.wTree.get_widget("scrolledwindow1").emit('scroll-child', gtk.SCROLL_END, False)
问题出在哪里？
When I try to scroll down to the end of my TreeView, which is inside a ScrolledWindow, it doesn't scroll where it should but one or two lines before.
I tried several methods and they all provide the same behavior :
self.wTree.get_widget("tree_last_log").scroll_to_cell((self.number_results-1,))
# or
self.wTree.get_widget("tree_last_log").set_cursor((self.number_results-1,))
# or
adj = self.wTree.get_widget("scrolledwindow1").get_vadjustment()
adj.set_value(adj.get_property('upper'))
self.wTree.get_widget("scrolledwindow1").set_vadjustment(adj)
# or
self.wTree.get_widget("scrolledwindow1").emit('scroll-child', gtk.SCROLL_END, False)
Where is the problem ?
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评论（2）
C API 文档可能会有所帮助：
http://library.gnome .org/devel/gtk/stable/GtkTreeView.html#gtk-tree-view-scroll-to-cell
你可以看到那里有一些参数会搞乱事情，具体取决于 pygtk 如何默认它们。您可以尝试显式指定所有参数。
TreeView 和 TextView 的一个技巧是它们进行异步布局，因此如果尚未计算行高，则调整的“上部”很可能为零。
如果调整不当，则无需将其调回原位，尽管这应该是无害的。
'scroll-child' 信号不是你想要的，这是一个用于绑定按键的按键绑定信号。
The C API docs may be helpful:
http://library.gnome.org/devel/gtk/stable/GtkTreeView.html#gtk-tree-view-scroll-to-cell
You can see there are arguments there that would mess things up, depending on how pygtk defaults them. You might try specifying explicitly all the args.
One trick to TreeView and TextView is that they do asynchronous layout so the "upper" on the adjustment may well just be zero if row heights haven't been computed yet.
if messing with the adjustment, there's no need to set it back, though it should be harmless.
'scroll-child' signal is not what you want, that's a keybinding signal used to bind keys to.
经过这么多年，
scroll_to_cell()和set_cursor()在某些情况下似乎仍然不准确。一种解决方法是使用get_vadjustment()/get_hadjustment()获取TreeView小部件的Adjustment（来自Scrollable接口）并计算我们自己需要的值。如果我们想垂直滚动到给定路径的行：
scroll_to_cell()andset_cursor()still seem to be inaccurate in some cases after all these years. One workaround would be to get theAdjustment's of ourTreeViewwidget withget_vadjustment()/get_hadjustment()(from theScrollableinterface) and calculate the values we need ourselves.If we want to scroll vertically to a row with given path: