Question

我正在使用python和GTK + 3构建一个应用程序，并使用ScrollledWindow中的TreeView以表格形式显示数据。

通过拖动树视图行，滚动窗口是否可以配置为执行滚动？像我们在（移动）触摸屏上做的事情。

在文档中，ScrolledWindows具有动态滚动属性，但是：

我不知道如何使用它
我没有触摸屏，只想用鼠标来模拟它。

我不需要跨平台的解决方案，只需要Ubuntu。

谢谢。

Answer 1

可能的解决方案是连接到button press event和button release event。这将传递小部件（treeview）和一个事件。该事件具有.x和.y属性，可用于检测鼠标移动的距离。

事件属性的文档已关闭：（

<强>更新

我想出了如何做到你所要求的。观察button press event，button release event和motion notify event必须在树视图上。这是使用Gtk Builder。

glade.ui文件的代码：

<?xml version="1.0" encoding="UTF-8"?>
<!-- Generated with glade 3.18.3 -->
<interface>
  <requires lib="gtk+" version="3.0"/>
  <object class="GtkListStore" id="liststore1">
    <columns>
      <!-- column-name gchararray1 -->
      <column type="gchararray"/>
    </columns>
  </object>
  <object class="GtkWindow" id="window">
    <property name="visible">True</property>
    <property name="can_focus">False</property>
    <property name="title" translatable="yes">window</property>
    <property name="default_width">500</property>
    <property name="default_height">400</property>
    <signal name="destroy" handler="on_window_destroy" swapped="no"/>
    <child>
      <object class="GtkScrolledWindow" id="scrolledwindow1">
        <property name="visible">True</property>
        <property name="can_focus">True</property>
        <property name="events"/>
        <property name="shadow_type">in</property>
        <child>
          <object class="GtkTreeView" id="treeview1">
            <property name="visible">True</property>
            <property name="can_focus">True</property>
            <property name="events"/>
            <property name="model">liststore1</property>
            <signal name="button-press-event" handler="button_press_event" swapped="no"/>
            <signal name="button-release-event" handler="button_release_event" swapped="no"/>
            <signal name="motion-notify-event" handler="motion_notify_event" swapped="no"/>
            <child internal-child="selection">
              <object class="GtkTreeSelection" id="treeview-selection1"/>
            </child>
            <child>
              <object class="GtkTreeViewColumn" id="treeviewcolumn1">
                <property name="title" translatable="yes">column</property>
                <child>
                  <object class="GtkCellRendererText" id="cellrenderertext1"/>
                  <attributes>
                    <attribute name="text">0</attribute>
                  </attributes>
                </child>
              </object>
            </child>
          </object>
        </child>
      </object>
    </child>
  </object>
</interface>

.py文件的代码：

#!/usr/bin/python

import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk, GdkPixbuf, Gdk
import os, sys

UI_FILE = "glade.ui"

class GUI:
    def __init__(self):

        self.builder = Gtk.Builder()
        self.builder.add_from_file(UI_FILE)
        self.builder.connect_signals(self)

        liststore = self.builder.get_object('liststore1')
        for i in range (100):
            liststore.append([str(i)])

        self.v_scroll = self.builder.get_object('scrolledwindow1').get_vadjustment ()
        self.mouse_down = False
        self.previous_y = 0
        self.previous_position = 0
        window = self.builder.get_object('window')
        window.show_all()

    def button_press_event (self, treeview, event):
        if event.button == 1:
            self.mouse_down = True
            self.previous_y = event.y
            self.previous_position = self.v_scroll.get_value()

    def button_release_event (self, treeview, event):
        self.mouse_down = False

    def motion_notify_event (self, scrolled_window, event):
        if self.mouse_down == False:
            return
        current_y = event.y
        y_movement = (self.previous_y - current_y)
        scroll_position = (self.previous_position + y_movement)
        self.v_scroll.set_value(scroll_position)

    def on_window_destroy(self, window):
        Gtk.main_quit()

def main():
    app = GUI()
    Gtk.main()

if __name__ == "__main__":
    sys.exit(main())

变量名称应该很好地解释它们的作用。如果我理解错误，请纠正我。

ScrolledWindow通过拖动滚动（在触摸屏上模拟手指）

1 个答案: