我有一個需要大量水平空間的浮動或複雜條目的QTableWidget。通過字符串格式化顯示數值減少的數值可以正常工作,但顯然當我編輯和存儲表中的條目時,我的精度會變差。QTableView不會將預期的FocusIn/FocusOut事件發送到eventFilter
我已經發現了QLineEdit的窗口小部件中的溶液通過使用eventFilter:甲FocusIn
事件拷貝存儲的值全精度的QLineEdit的文本字段,一個FocusOut
事件或Return_Key
存儲改變的值並且以降低的數量覆蓋文本字段數字。
使用帶有QTableWidgets同樣的方法給我下面的(可能是相關的)問題:
-
預期
- 的focusIn和focusOut事件不會產生:當我在項目上雙擊,我得到一個事件的內容事件中,單擊另一個項目會產生FocusIn事件
- 我無法複製編輯的選定項目的內容,我總是獲取未編輯的值。
- 通過點擊選擇一個項目不會產生一個事件。
我試過評估QTableWidgetItem事件,但我沒有收到任何 - 我需要在每個QTableWidgetItem上設置事件過濾器嗎?如果是這樣,我每次調整表格的大小(在我的應用程序中頻繁使用)時,是否需要斷開QTableWidgetItem eventFilters?用QLineEdit小部件填充我的表是否有意義?
附加的MWE不是很小,但我可以縮小它。
# -*- coding: utf-8 -*-
#from PyQt5.QWidgets import (...)
from PyQt4.QtGui import (QApplication, QWidget, QTableWidget, QTableWidgetItem,
QLabel, QVBoxLayout)
import PyQt4.QtCore as QtCore
from PyQt4.QtCore import QEvent
from numpy.random import randn
class EventTable (QWidget):
def __init__(self, parent = None):
super(EventTable, self).__init__(parent)
self.myTable = QTableWidget(self)
self.myTable.installEventFilter(self) # route all events to self.eventFilter()
myQVBoxLayout = QVBoxLayout()
myQVBoxLayout.addWidget(self.myTable)
self.setLayout(myQVBoxLayout)
self.rows = 3; self.columns = 4 # table + data dimensions
self.data = randn(self.rows, self.columns) # initial data
self._update_table() # create table
def eventFilter(self, source, event):
if isinstance(source, (QTableWidget, QTableWidgetItem)):
# print(type(source).__name__, event.type()) #too much noise
if event.type() == QEvent.FocusIn: # 8: enter widget
print(type(source).__name__, "focus in")
self.item_edited = False
self._update_table_item() # focus: display data with full precision
return True # event processing stops here
elif event.type() == QEvent.KeyPress:
print(type(source).__name__, "key pressed")
self.item_edited = True # table item has been changed
key = event.key() # key press: 6, key release: 7
if key in {QtCore.Qt.Key_Return, QtCore.Qt.Key_Enter}: # store entry
self._store_item() # store edited data in self.data
return True
elif key == QtCore.Qt.Key_Escape: # revert changes
self.item_edited = False
self._update_table() # update table from self.data
return True
elif event.type() == QEvent.FocusOut: # 9: leave widget
print(type(source).__name__, "focus out")
self._store_item()
self._update_table_item() # no focus: use reduced precision
return True
return super(EventTable, self).eventFilter(source, event)
def _update_table(self):
"""(Re-)Create the table with rounded data from self.data """
self.myTable.setRowCount(self.rows)
self.myTable.setColumnCount(self.columns)
for col in range(self.columns):
for row in range(self.rows):
self.myTable.setItem(row,col,
QTableWidgetItem(str("{:.3g}".format(self.data[row][col]))))
self.myTable.resizeColumnsToContents()
self.myTable.resizeRowsToContents()
def _update_table_item(self, source = None):
""" Re-)Create the current table item with full or reduced precision. """
row = self.myTable.currentRow()
col = self.myTable.currentColumn()
item = self.myTable.item(row, col)
if item: # is something selected?
if not item.isSelected(): # no focus, show self.data[row][col] with red. precision
print("\n_update_item (not selected):", row, col)
item.setText(str("{:.3g}".format(self.data[row][col])))
else: # in focus, show self.data[row][col] with full precision
item.setText(str(self.data[row][col]))
print("\n_update_item (selected):", row, col)
def _store_item(self):
""" Store the content of item in self.data """
if self.item_edited:
row = self.myTable.currentRow()
col = self.myTable.currentColumn()
item_txt = self.myTable.item(row, col).text()
self.data[row][col] = float(str(item_txt))
print("\n_store_entry - current item/data:", item_txt, self.data[row][col])
if __name__ == "__main__":
import sys
app = QApplication(sys.argv)
mainw = EventTable()
app.setActiveWindow(mainw)
mainw.show()
sys.exit(app.exec_())
一個真正優雅的解決方案!我想,我必須咬入[delegate_classes](http://doc.qt.io/qt-5/model-view-programming.html#delegate-classes)... – Chipmuenk