Python Gtk3 - 通过鼠标和课程器位置在 ScrolledWindow 内滚动 TextView

Question

我在 Gtk.TextView 中有一些文本

当我用鼠标选择文本或将光标导航到底部边缘之外时，我无法看到我的选择，因为它不滚动。

所以我想我需要获取光标位置并将树视图设置为该位置。单击按钮时的鼠标位置并将树视图移动到该位置。

• https://lazka.github.io/pgi-docs/Gtk-3.0/classes/TreeView
• https://lazka.github.io/pgi-docs/Gtk-3.0/classes/ScrolledWindow
• https://lazka.github.io/pgi-docs/Gtk-3.0/classes/Widget

#!/usr/bin/env python
import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk

class ScrolledWindow(Gtk.Window):
    def __init__(self):
        Gtk.Window.__init__(self)
        self.set_default_size(200, 200)
        self.connect("destroy", Gtk.main_quit)

        self.scrolledwindow = Gtk.ScrolledWindow()

        self.add(self.scrolledwindow)

        box = Gtk.Box()
        self.scrolledwindow.add(box)

        textview = Gtk.TextView()
        box.pack_start(textview, True, True, 10)
        
        textview.connect("move-cursor", self.move_cursor_event) # arrow keys
        textview.connect("key-press-event", self.key_press_event) # keyboard input
        textview.connect("button-press-event", self.button_press_event) # mouse click 
        
        textbuffer = textview.get_buffer()
        
        text = 50*"Hello World\n"
        
        textbuffer.set_text(text, len(text))
        
    def move_cursor_event(self, tree_view, step, count, extend_selection):
        print "move_cursor_event", step, count, extend_selection
        
    def key_press_event(self, widget, event):
        print "key_press_event", event
        
    def button_press_event(self, widget, event):
        print "button_press_event", event.x, event.y
        position = self.scrolledwindow.get_vadjustment()
        position.set_value(350) 
        self.scrolledwindow.set_vadjustment(position)  #scroll to the middle of the scolled window
        

window = ScrolledWindow()
window.show_all()

Gtk.main()

谢谢

编辑1

这是我发现的一个非常基本的解决方案，用于将窗口滚动到通过箭头键更改的光标位置：

def move_cursor_event(self, tree_view, step, count, extend_selection):
    rect = tree_view.get_cursor_locations()
    self.scroll_y(rect.strong.y)

def scroll_y(self, ypos):
    vadj = self.scrolled_window.get_vadjustment()
    vadj.set_value(ypos-80) 
    self.scrolled_window.set_vadjustment(vadj)

Answer 1

这里的问题是textview被放在一个盒子里，然后又被放进去self.scrolledwindow。当TextView位于 a 内部时Box，它会阻止ScrolledWindow识别TextView需要滚动。TextView直接将其放入ScrolledWindow应该可以解决此问题。代码应如下所示：

#!/usr/bin/env python
import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk

class ScrolledWindow(Gtk.Window):
    def __init__(self):
        Gtk.Window.__init__(self)
        self.set_default_size(200, 200)
        self.connect("destroy", Gtk.main_quit)

        self.scrolledwindow = Gtk.ScrolledWindow()

        self.add(self.scrolledwindow)

        textview = Gtk.TextView()
        self.scrolledwindow.add(textview)
        
        textbuffer = textview.get_buffer()
        
        text = 50*"Hello World\n"
        
        textbuffer.set_text(text, len(text))  #scroll to the middle of the scolled window
        
window = ScrolledWindow()
window.show_all()

Gtk.main()