Gtk，如何滚动视口列表的底部？ [英] Gtk, How to scroll at bottom of viewport list?

问题描述

我使用GtkVBox和GtkViewPort创建了一个列表。
我正在做两个上/下GtkButton的滚动。

I have created one list with GtkVBox and GtkViewPort.
and i am doing the scroll by two up/down GtkButtons.

    GtkAdjustment* adjustment;
    adjustment = gtk_viewport_get_vadjustment(GTK_VIEWPORT(viewport_ptr));
    gtk_adjustment_set_value(adjustment, gtk_adjustment_get_value(adjustment)+(gdouble)SCROLL_SIZE);
    gtk_widget_show_all(viewport_ptr);

但是，当我将小部件添加到VBox时，它会在VBox的最后添加，因为我正在使用 gtk_box_pack_start 。所以我想滚动视口到这个新添加的最后一个小部件，它位于列表的最底部。

But when I add the widget to VBox it gets added at the end of the VBox as I am using gtk_box_pack_start. So i want to scroll viewport up to this newly added last widget which is at bottom of the list.

推荐答案

将调整设置为最大值：

Did you try just setting the adjustment to the maximum value:

gtk_adjustment_set_value(adjustment, gtk_adjustment_get_upper(adjustment));

请注意，您可能需要延迟此操作，或者从适当的事件触发它，因为上限会随着滚动的vbox的增长而改变。

Note that you might need to delay this, or trigger it from a suitable event, since the upper bound will change as the scrolled vbox grows.

我的建议是将它挂到 size-allocate 信号。

My suggestion would be to hook it into the size-allocate signal of the GtkVBox.

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