在Gtk TreeView树中显示图标或颜色

Question

我在加载文件或在Gtk TreeView(GTK3的Python绑定)的一列中显示颜色时遇到困难.从QGIS中获取的示例在第一行显示图标,在第二行显示蓝色圆圈.颜色取自图层属性:

我的代码看起来像这样,但不会将icon.png文件加载到同一目录中:

#!/usr/bin/python3
from gi.repository import Gtk, Gdk, GdkPixbuf

class MyWindow(Gtk.Window):
    def __init__(self):
        Gtk.Window.__init__(self)
        self.set_default_size(200, 200)

        self.liststore = Gtk.ListStore(GdkPixbuf.Pixbuf, str)
        self.treeview = Gtk.TreeView(model=self.liststore)

        symbol1 = GdkPixbuf.Pixbuf.new_from_file("icon.png")
        self.liststore.append([symbol1, "This is a symbol1"])

        symbol2 = Gtk.IconTheme.get_default().load_icon("gtk-cut", 64, 0)
        self.liststore.append([symbol2, "This is symbol2"])

        px_renderer = Gtk.CellRendererPixbuf()
        px_column = Gtk.TreeViewColumn("Icon", px_renderer)
        self.treeview.append_column(px_column) 

        str_renderer = Gtk.CellRendererText()
        str_column = Gtk.TreeViewColumn("Name", str_renderer, text=1)
        self.treeview.append_column(str_column)

        self.add(self.treeview)

win = MyWindow()
win.connect("delete-event", Gtk.main_quit)
win.show_all()
Gtk.main()

GTK3 pixbuf的文档在这里:

• https://lazka.github.io/pgi-docs/index.html#GdkPixbuf-2.0/classes/Pixbuf.html

PyGTK的旧例子就在这里,但是处理它的方式确实发生了变化:

• http://faq.pygtk.org/index.py?file=faq13.006.htp&req=show
• http://www.daa.com.au/pipermail/pygtk/2003-August/005644.html

Answer 1

这个问题可以解决的PyGTK2.0类似,你需要连接的两个对象CellRendererText和CellRendererPixbuf的一个对象TreeViewColumn,然后调用set_cell_data_func列的方法来设置数据返回器功能的细胞.这是一个很小的复杂(见下面的代码):

from gi.repository import Gtk, Gdk, GdkPixbuf

class MyWindow(Gtk.Window):
    def __init__(self):
        Gtk.Window.__init__(self)
        self.set_default_size(200, 200)

        self.liststore = Gtk.ListStore(str, str)
        self.treeview = Gtk.TreeView(model=self.liststore)

        self.liststore.append(["icon.png", "This is a symbol1"])

        px_renderer = Gtk.CellRendererPixbuf()
        px_column = Gtk.TreeViewColumn('')
        px_column.pack_start(px_renderer, False)
        str_renderer = Gtk.CellRendererText()
        px_column.pack_start(str_renderer, False)
        # set data connector function/method
        px_column.set_cell_data_func(px_renderer, self.get_tree_cell_pixbuf)
        px_column.set_cell_data_func(str_renderer, self.get_tree_cell_text)
        self.treeview.append_column(px_column)

        self.add(self.treeview)

    def get_tree_cell_text(self, col, cell, model, iter, user_data):
        cell.set_property('text', model.get_value(iter, 1))

    def get_tree_cell_pixbuf(self, col, cell, model, iter, user_data):
        cell.set_property('pixbuf', GdkPixbuf.Pixbuf.new_from_file(model.get_value(iter, 0)))

if __name__ == '__main__':
    win = MyWindow()
    win.connect("delete-event", Gtk.main_quit)
    win.show_all()
    Gtk.main()

你可以使用pygtk2.0的文件关于TreeViewColumn.set_cell_data_func方法,阅读关于PyGTK2.0的重要页面CellRenderers以及可以在PyGTK的版本3上有用的特殊属性:)