我正在构建一个 GUI（GTK3 的 Python 绑定），其中一个 Gtk 滚动窗口（来自 Glade）可以包含不同的树视图。该程序启动时有一个空窗口，第一次一切正常：
self.scrolled_window.add_with_viewport(treeview)
self.main_window.show_all()
Edit:测试程序图片（见下面的来源）：
第二次我收到以下错误：
（main.py：15905）：Gtk-CRITICAL **：gtk_scrolled_window_add_with_viewport：断言'gtk_bin_get_child（GTK_BIN（child_widget））== NULL'失败
我认为我可能需要先清空视口或滚动窗口，但不知道这是如何完成的，也找不到任何相关文档。
Edit:使用时self.scrolled_window.remove(self.scrolled_window.get_child())我在启动时看不到数据集，并且在切换图层时出现错误消息。
编辑：我再次更新了代码，因此示例数据从一开始就在那里。
林间空地文件（test_project.glade）：
<?xml version="1.0" encoding="UTF-8"?>
<!-- Generated with glade 3.16.1 -->
<interface>
<requires lib="gtk+" version="3.10"/>
<object class="GtkWindow" id="window1">
<property name="can_focus">False</property>
<property name="default_width">440</property>
<property name="default_height">250</property>
<signal name="destroy" handler="on_window1_destroy" swapped="no"/>
<child>
<object class="GtkBox" id="box1">
<property name="visible">True</property>
<property name="can_focus">False</property>
<property name="orientation">vertical</property>
<child>
<object class="GtkScrolledWindow" id="scrolledwindow1">
<property name="visible">True</property>
<property name="can_focus">True</property>
<property name="shadow_type">in</property>
<child>
<placeholder/>
</child>
</object>
<packing>
<property name="expand">True</property>
<property name="fill">True</property>
<property name="position">0</property>
</packing>
</child>
<child>
<object class="GtkScrolledWindow" id="scrolledwindow2">
<property name="visible">True</property>
<property name="can_focus">True</property>
<property name="shadow_type">in</property>
<child>
<placeholder/>
</child>
</object>
<packing>
<property name="expand">True</property>
<property name="fill">True</property>
<property name="position">1</property>
</packing>
</child>
<child>
<object class="GtkBox" id="box2">
<property name="visible">True</property>
<property name="can_focus">False</property>
<child>
<object class="GtkButton" id="add_layer">
<property name="label" translatable="yes">add layer</property>
<property name="visible">True</property>
<property name="can_focus">True</property>
<property name="receives_default">True</property>
<signal name="clicked" handler="on_add_layer_clicked" swapped="no"/>
</object>
<packing>
<property name="expand">False</property>
<property name="fill">True</property>
<property name="position">0</property>
</packing>
</child>
<child>
<object class="GtkButton" id="add_data">
<property name="label" translatable="yes">add data</property>
<property name="name">add_data</property>
<property name="visible">True</property>
<property name="can_focus">True</property>
<property name="receives_default">True</property>
<signal name="clicked" handler="on_add_data_clicked" swapped="no"/>
</object>
<packing>
<property name="expand">False</property>
<property name="fill">True</property>
<property name="position">1</property>
</packing>
</child>
</object>
<packing>
<property name="expand">False</property>
<property name="fill">True</property>
<property name="position">2</property>
</packing>
</child>
</object>
</child>
</object>
</interface>
蟒蛇代码：
#!/usr/bin/python3
from gi.repository import Gtk
import random
class BottomTreeView(Gtk.TreeView):
def __init__(self, store):
Gtk.TreeView.__init__(store)
self.store = store
renderer = Gtk.CellRendererText()
column = Gtk.TreeViewColumn("Dataset", renderer, text=0)
self.append_column(column)
for x in range(10):
self.store.append(None, [str(random.random())])
class MainWindow(object):
def __init__(self, builder):
self.main_window = builder.get_object("window1")
self.sw1 = builder.get_object("scrolledwindow1")
self.sw2 = builder.get_object("scrolledwindow2")
self.layernumber = 0
self.topstore = Gtk.TreeStore(str, object)
self.topview = Gtk.TreeView(self.topstore)
renderer1 = Gtk.CellRendererText()
column1 = Gtk.TreeViewColumn("Name", renderer1, text=0)
self.topview.append_column(column1)
self.sw1.add_with_viewport(self.topview)
#Adding test data in a dumb way
self.store1 = Gtk.TreeStore(str)
for x in range(10):
self.store1.append(None, [str(random.random())])
self.view1 = Gtk.TreeView(self.store1)
self.rend1 = Gtk.CellRendererText()
self.col1 = Gtk.TreeViewColumn("Dataset", self.rend1, text=0)
self.view1.append_column(self.col1)
self.sw2.add_with_viewport(self.view1)
self.topstore.append(None, ["Layer 1", self.view1])
self.store2 = Gtk.TreeStore(str)
for x in range(10):
self.store2.append(None, [str(random.random())])
self.view2 = Gtk.TreeView(self.store2)
self.rend2 = Gtk.CellRendererText()
self.col2 = Gtk.TreeViewColumn("Dataset", self.rend2, text=0)
self.view2.append_column(self.col2)
self.topstore.append(None, ["Layer 2", self.view2])
self.select = self.topview.get_selection()
self.select.connect("changed", self.on_tree_selection_changed)
self.main_window.show_all()
def on_add_layer_clicked(self, widget):
self.layernumber += 1
store = Gtk.TreeStore(str)
bottom = BottomTreeView(store)
self.topstore.append(None, [str(self.layernumber), bottom])
def on_add_data_clicked(self, widget):
self.selection = self.topview.get_selection()
model, treeiter = self.selection.get_selected()
print("Adding data to {0}".format(model[treeiter][0]))
datasheet = model[treeiter][1]
datasheet.store.append(None, [str(random.random())])
def on_window1_destroy(self, widget):
Gtk.main_quit()
def on_tree_selection_changed(self, selection):
print("\n>>> Selection changed")
model, treeiter = selection.get_selected()
print(">>> Model: {0}, Treeiter: {1}".format(model, treeiter))
if treeiter != None:
print(">>> You selected Layer {0}.".format(model[treeiter][1]))
tree_obj = model[treeiter][1]
#The following lines mess up the program from the startup
#self.sw2.remove(self.sw2.get_child())
#self.sw2.add_with_viewport(tree_obj)
#self.main_window.show_all()
def main():
builder = Gtk.Builder()
objects = builder.add_objects_from_file("test_project.glade",
("window1", ""))
window_instance = MainWindow(builder)
builder.connect_signals(window_instance)
Gtk.main()
if __name__ == "__main__":
main()
