python-3.x - Python - 在可编辑的 Gtk.TreeView 单元格中自动完成

Question

我最近在用 QTable 中的 QComboBox 编写 PyQt 代码。默认情况下，QComboBox 具有自动完成功能。我想尝试用 Gtk3 在 Python3 中重现它。我遇到了这个例子:

Gtk.Entry in Gtk.TreeView (CellRenderer)

这似乎已经成功地向 Treeview 中的 ComboBox 添加了一个自动完成功能。该示例不完整，我希望有人能给我一个完整的工作示例。我不知道如何将 CellRendererAutoComplete 类“连接”到 TreeView 中的其中一列。

我真正想要的是在可编辑的 TreeView 单元格(有或没有 ComboBox)中有自动完成功能，但我过去从未在 Gtk 中遇到过这个。

谢谢。

这是一个代码示例:

# https://stackoverflow.com/questions/13756787/
# https://python-gtk-3-tutorial.readthedocs.io/en/latest/cellrenderers.html
import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk
#######################################################################
class CellRendererAutoComplete(Gtk.CellRendererText):
    """ Text entry cell which accepts a Gtk.EntryCompletion object """
    __gtype_name__ = 'CellRendererAutoComplete'
    def __init__(self, completion):
        self.completion = completion
        Gtk.CellRendererText.__init__(self)
    def do_start_editing(
               self, event, treeview, path, background_area, cell_area, flags):
        if not self.get_property('editable'):
            return
        entry = Gtk.Entry()
        entry.set_completion(self.completion)
        entry.connect('editing-done', self.editing_done, path)
        entry.show()
        entry.grab_focus()
       return entry

    def editing_done(self, entry, path):
        self.emit('edited', path, entry.get_text())
#######################################################################
class CellRendererTextWindow(Gtk.Window):

    def __init__(self):
        Gtk.Window.__init__(self, title="CellRendererText Example")

        self.set_default_size(200, 200)

        self.liststore = Gtk.ListStore(str, str)
        self.liststore.append(["Fedora", "http://fedoraproject.org/"])
        self.liststore.append(["Slackware", "http://www.slackware.com/"])
        self.liststore.append(["Sidux", "http://sidux.com/"])

        treeview = Gtk.TreeView(model=self.liststore)

        renderer_text = Gtk.CellRendererText()
        column_text = Gtk.TreeViewColumn("Text", renderer_text, text=0)
        treeview.append_column(column_text)

        renderer_editabletext = Gtk.CellRendererText()
        renderer_editabletext.set_property("editable", True)
########
# This is the problem area, I suppose, but I'm not sure
        x = CellRendererAutoComplete()     
        renderer_editabletext.connect('on_edit',x(renderer_editabletext))
########
        column_editabletext = Gtk.TreeViewColumn("Editable Text",renderer_editabletext, text=1)
        treeview.append_column(column_editabletext)

        renderer_editabletext.connect("edited", self.text_edited)

        self.add(treeview)

    def text_edited(self, widget, path, text):
        self.liststore[path][1] = text

win = CellRendererTextWindow()
win.connect("destroy", Gtk.main_quit)
win.show_all()
Gtk.main()

Answer 1

下面是一个使用 EntryCompletion 显示 CellRendererText 和 CellRendererCombo 的示例。

由于Treeview的复杂性，一个ListStore可以是Completion, Combo, and Entry背后的模型，另一个模型可以是Treeview的背后，大家应该很好掌握的 Gtk.Treeview 来理解这个例子。请注意，此示例仅使用一个 Liststore，并且 CellRendererText 和 CellRendererColumn 仅使用一个可编辑列。这使示例变得困惑，但它是我能想到的最简单的示例，因为我不知道此 Treeview 的预期用途。

#!/usr/bin/python

import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk


class CellRendererTextWindow(Gtk.Window):

    def __init__(self):
        Gtk.Window.__init__(self, title="CellRendererText Example")

        self.set_default_size(200, 200)

        self.liststore = Gtk.ListStore(str, str)
        self.liststore.append(["Fedora", "http://fedoraproject.org/"])
        self.liststore.append(["Slackware", "http://www.slackware.com/"])
        self.liststore.append(["Sidux", "http://sidux.com/"])

        treeview = Gtk.TreeView(model=self.liststore)

        self.completion = Gtk.EntryCompletion(model = self.liststore)
        self.completion.set_text_column(1)
        self.completion.connect('match-selected', self.renderer_match_selected)

        renderer_text = Gtk.CellRendererText()
        column_text = Gtk.TreeViewColumn("Text", renderer_text, text=0)
        treeview.append_column(column_text)

######## CellRendererText with EntryCompletion example
        renderer_text = Gtk.CellRendererText()
        renderer_text.connect('editing-started', self.renderer_text_editing_started)
        renderer_text.connect('edited', self.text_edited)
        renderer_text.set_property("editable", True)

        column_text_autocomplete = Gtk.TreeViewColumn("Editable Text", renderer_text, text=1)
        treeview.append_column(column_text_autocomplete)

######## CellRendererCombo with EntryCompletion example
        renderer_combo = Gtk.CellRendererCombo(model = self.liststore)
        renderer_combo.set_property("text-column", 1)
        renderer_combo.connect('editing-started', self.renderer_combo_editing_started)
        renderer_combo.connect('changed', self.combo_changed)
        renderer_combo.set_property("editable", True)

        column_combo_autocomplete = Gtk.TreeViewColumn("Editable Combo", renderer_combo, text=1)
        treeview.append_column(column_combo_autocomplete)


        self.add(treeview)

    def renderer_match_selected (self, completion, model, tree_iter):
        ''' beware ! the model and tree_iter passed in here are the model from the
        EntryCompletion, which may or may not be the same as the model of the Treeview '''
        text_match =  model[tree_iter][1]
        self.liststore[self.path][1] = text_match

    def renderer_text_editing_started (self, renderer, editable, path):
        ''' since the editable widget gets created for every edit, we need to 
        connect the completion to every editable upon creation '''
        editable.set_completion(self.completion)
        self.path = path # save the path for later usage

    def text_edited(self, widget, path, text):
        self.liststore[path][1] = text

    def renderer_combo_editing_started (self, renderer, combo, path):
        ''' since the editable widget gets created for every edit, we need to 
        connect the completion to every editable upon creation '''
        editable = combo.get_child() # get the entry of the combobox
        editable.set_completion(self.completion)
        self.path = path # save the path for later usage

    def combo_changed (self, combo, path, tree_iter):
        ''' the path is from the treeview and the tree_iter is from the model 
        of the combobox which may or may not be the same model as the treeview'''
        combo_model = combo.get_property('model')
        text = combo_model[tree_iter][1]
        self.liststore[path][1] = text

win = CellRendererTextWindow()
win.connect("destroy", Gtk.main_quit)
win.show_all()
Gtk.main()

在官方docs ，明确指出 editing-started 的目的是添加一个 EntryCompletion 等。在我发现文档中的小提示之前，我还对 Gtk.CellRendererText 进行了子类化。