python - 如何从 Qlistwidget 中选择项目，并更新 Pyqt5 中的文本框？
问题描述
通过键盘（按键事件）从 QListWidget 中选择项目，效果很好。
但同时，我也想通过鼠标单击从 QListWidget 中选择项目。
尝试使用“itemclicked.connect”，但它不像我预期的那样工作。
我的代码在这里：
文件 1（文件名：example_main_001.py）：
import sys
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from example_source_file_001 import Sourcefile
textbox_items = {
"textbox1": ["Python", "Python 2.7", "Python 2.9", "Python 3.5", "Python 3.7", "National", "Zebra",
"Apple", "X Ray", "Boat", "Tiger", "Item001", "Item002", "Item003", "Item004", "Item005",
"001Item", "002Item", "003Item", "004Item", "005Item", "Ball", "Cat", "Dog", "Fish",
"Gold Fish", "Star Fish", "2821", "2822", "2823", "2811", "2812", "2813"],
"textbox2": ["India","America","Russia","China","England","Iran","Iraq","Ice Land"],
"textbox3": ["Red", "Dark red", "Light Red", "Redish Blue", "Redish Green", "Green","Blue","Dark
Blue", "Dark Green"]
}
class Mclick_sample_main(QWidget):
def __init__(self):
super().__init__()
self.setWindowTitle("Mouse click Samples")
self.textbox1 = QLineEdit()
self.textbox2 = QLineEdit()
self.textbox3 = QLineEdit()
self.lbox1 = QListWidget()
self.lbox2 = QListWidget()
self.textbox1.setObjectName("textbox1")
self.textbox2.setObjectName("textbox2")
self.textbox3.setObjectName("textbox3")
self.lbox1.setObjectName("listbox1")
self.lbox2.setObjectName("listbox2")
vbox = QVBoxLayout(self)
vbox.addWidget(self.textbox1)
vbox.addWidget(self.textbox2)
vbox.addWidget(self.textbox3)
vbox.addWidget(self.lbox2)
self.current_textbox = None
QApplication.instance().focusChanged.connect(self.on_focusChanged)
self.textbox1.returnPressed.connect(lambda: self.textbox2.setFocus(Qt.ShortcutFocusReason))
self.textbox2.returnPressed.connect(lambda: self.textbox3.setFocus(Qt.ShortcutFocusReason))
self.textbox3.returnPressed.connect(lambda: self.textbox1.setFocus(Qt.ShortcutFocusReason))
def on_focusChanged(self, old, new):
fwidget = QApplication.focusWidget()
if fwidget is not None:
if isinstance(new, QLineEdit) and new != self.current_textbox:
self.current_textbox = new
self.lbox1.clear()
self.lbox1.addItems(textbox_items[new.objectName()])
self.lbox2.clear()
self.lbox2.addItems(textbox_items[new.objectName()])
self.getdetails_1 = Sourcefile(self.current_textbox, self.lbox1, self.lbox2)
self.current_textbox.textChanged.connect(self.getdetails_1.func_textbox_textchanged)
def main():
myapp = QApplication(sys.argv)
mywin = Mclick_sample_main()
mywin.show()
sys.exit(myapp.exec_())
if __name__ == "__main__":
main()
文件 2（文件名：example_source_file_001.py）
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *
flag = 1
search_text_length = 0
startitem_rowno = None
enditem_rowno = None
selected_item = None
selec_item = None
class Sourcefile(QWidget):
def __init__(self, textbox, listbox1,listbox2,parent=None):
super().__init__(listbox2)
global startitem_rowno,enditem_rowno
self.setFocusPolicy(Qt.StrongFocus)
self.tbox1 = textbox
self.lbox1 = listbox1
self.lbox2 = listbox2
self.tbox1.installEventFilter(self)
self.lbox2.installEventFilter(self)
startitem_rowno = 0
enditem_rowno = len(self.lbox2) - 1
def eventFilter(self, source, event):
global cursor_position, textbox_value,selected_item
if event.type() == QEvent.KeyPress and source is self.tbox1:
if event.modifiers() == Qt.AltModifier and event.key() == Qt.Key_S:
self.func_item_startswith()
return True
if event.key() == Qt.Key_Down:
self.lbox2.setFocus()
self.lbox2.setCurrentRow(startitem_rowno)
cursor_position = self.tbox1.cursorPosition()
textbox_value = self.tbox1.text()
if event.key() == Qt.Key_Up:
self.lbox2.setFocus()
self.lbox2.setCurrentRow(enditem_rowno)
cursor_position = self.tbox1.cursorPosition()
textbox_value = self.tbox1.text()
if event.key() == Qt.Key_Return:
pass
if event.type() == QEvent.KeyPress and source is self.lbox2:
if event.key() == Qt.Key_Left or event.key() == Qt.Key_Backspace:
self.tbox1.setFocus()
return True
elif event.key() == Qt.Key_Return :
self.selected_item = self.lbox2.currentItem().text()
if self.selected_item is not None:
self.tbox1.setText(self.selected_item)
self.tbox1.setFocus()
return True
elif event.key() == Qt.Key_Up or event.key() == Qt.Key_Down:
pass
return super(Sourcefile, self).eventFilter(source, event)
def func_item_startswith(self):
global flag, startitem_rowno, enditem_rowno
flag = 1
startitem_rowno = 0
enditem_rowno = startitem_count - 1
# self.lbox2.clear()
if startitem_count > 0:
for item in item_startswith:
self.lbox2.addItem(item.text())
else:
print("No Matching from start item")
def func_item_normal(self):
global falg,startitem_rowno,enditem_rowno
flag = 0
startitem_rowno = 0
enditem_rowno = normal_count - 1
self.lbox2.clear()
if normal_count > 0:
for item in item_normal:
self.lbox2.addItem(item.text())
def func_textbox_textchanged(self, txt):
global search_text, search_text_length, total_listbox_item, availableitem_count, normal_count, startitem_count, \
containitem_count, enditem_count, item_normal, item_startswith, item_contains, item_endswith, flag, \
startitem_rowno, enditem_rowno
search_text = self.tbox1.text()
search_text_length = len(search_text)
total_listbox_item = len(self.lbox2)
item_normal = self.lbox1.findItems("*", Qt.MatchWildcard)
item_startswith = self.lbox1.findItems(search_text, Qt.MatchStartsWith)
normal_count = len(item_normal)
startitem_count = len(item_startswith)
self.func_item_normal()
if search_text_length >= 1: pass
else: flag = 1
self.lbox2.clear()
if flag == 1:
self.func_item_startswith()
else:
self.func_item_normal()
解决方案
抱歉，我不太了解您的示例，但我尝试添加itemClicked.connect. 我标记了我进行更改的行。尝试一下：
example_main_001.py
import sys
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from example_source_file_001 import Sourcefile
textbox_items = {
"textbox1": ["Python", "Python 2.7", "Python 2.9", "Python 3.5", "Python 3.7", "National", "Zebra",
"Apple", "X Ray", "Boat", "Tiger", "Item001", "Item002", "Item003", "Item004", "Item005",
"001Item", "002Item", "003Item", "004Item", "005Item", "Ball", "Cat", "Dog", "Fish",
"Gold Fish", "Star Fish", "2821", "2822", "2823", "2811", "2812", "2813"],
"textbox2": ["India","America","Russia","China","England","Iran","Iraq","Ice Land"],
"textbox3": ["Red", "Dark red", "Light Red", "Redish Blue", "Redish Green", "Green","Blue",
"Dark Blue", "Dark Green"]
}
class ListWidget(QListWidget): # +++
def __init__(self, parent=None): # +++
super(ListWidget, self).__init__(parent) # +++
def _clicked(self, item): # +++
self.window().old.setText(item.text()) # +++
class Mclick_sample_main(QWidget):
def __init__(self):
super().__init__()
self.setWindowTitle("Mouse click Samples")
self.textbox1 = QLineEdit()
self.textbox2 = QLineEdit()
self.textbox3 = QLineEdit()
self.lbox1 = QListWidget()
self.old, self.new = None, None # +++
# self.lbox2 = QListWidget() # ---
self.lbox2 = ListWidget(self) # +++
self.lbox2.itemClicked.connect(self.lbox2._clicked) # +++
self.textbox1.setObjectName("textbox1")
self.textbox2.setObjectName("textbox2")
self.textbox3.setObjectName("textbox3")
self.lbox1.setObjectName("listbox1")
self.lbox2.setObjectName("listbox2")
vbox = QVBoxLayout(self)
vbox.addWidget(self.textbox1)
vbox.addWidget(self.textbox2)
vbox.addWidget(self.textbox3)
vbox.addWidget(self.lbox2)
self.current_textbox = None
QApplication.instance().focusChanged.connect(self.on_focusChanged)
self.textbox1.returnPressed.connect(lambda: self.textbox2.setFocus(Qt.ShortcutFocusReason))
self.textbox2.returnPressed.connect(lambda: self.textbox3.setFocus(Qt.ShortcutFocusReason))
self.textbox3.returnPressed.connect(lambda: self.textbox1.setFocus(Qt.ShortcutFocusReason))
def on_focusChanged(self, old, new):
fwidget = QApplication.focusWidget()
self.old, self.new = old, new # +++
if fwidget is not None:
if isinstance(new, QLineEdit) and new != self.current_textbox:
self.current_textbox = new
self.lbox1.clear()
self.lbox1.addItems(textbox_items[new.objectName()])
self.lbox2.clear()
self.lbox2.addItems(textbox_items[new.objectName()])
self.getdetails_1 = Sourcefile(self.current_textbox, self.lbox1, self.lbox2)
self.current_textbox.textChanged.connect(self.getdetails_1.func_textbox_textchanged)
def main():
myapp = QApplication(sys.argv)
mywin = Mclick_sample_main()
mywin.show()
sys.exit(myapp.exec_())
if __name__ == "__main__":
main()
推荐阅读
- spring-boot - 如何将 SpringBoot 连接到多个 DataSource？
- snowflake-cloud-data-platform - 如何查看多个任务名称的task_history
- c# - 如何访问我的 CommandLineParser 的值？
- ios - 如何在屏幕宽度上扩展图像？
- python - 在 Python 中创建字典
- reactjs - 在useState中设置api的响应为null
- javascript - 连接 HTML 和数据库
- vue.js - Vue路由器不工作 - 默认为根路径
- odata - Azure 数据工厂 ODATA 到雪花数据库
- node.js - 删除数据表格数据库404错误API | 数据库 | 快递js