如何检查复选框是选中还是未选中?(在 QTreeWidget 中) [英] How do I check if a checkbox is checked or unchecked? (In QTreeWidget)
本文介绍了如何检查复选框是选中还是未选中?(在 QTreeWidget 中)的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我写了下面的代码:
from PyQt4 import QtCore, QtGui
import sys
class window(QtGui.QMainWindow):
def __init__(self, parent=None):
super(window, self).__init__(parent)
self.TreeWidget = QtGui.QTreeWidget()
self.TreeWidget.setColumnCount(1)
item1 = QtGui.QTreeWidgetItem(["Item 1"])
item1.setCheckState(0, QtCore.Qt.Checked)
item2 = QtGui.QTreeWidgetItem(["Item 2"])
item2.setCheckState(0, QtCore.Qt.Unchecked)
item3 = QtGui.QTreeWidgetItem(["Item 3"])
item3.setCheckState(0, QtCore.Qt.Unchecked)
self.TreeWidget.addTopLevelItem(item1)
self.TreeWidget.addTopLevelItem(item2)
self.TreeWidget.addTopLevelItem(item3)
self.setCentralWidget(self.TreeWidget)
if item1.checkState(0) == QtCore.Qt.Checked:
print('item 1 is checked')
if item2.checkState(0) == QtCore.Qt.Checked:
print('item 2 is checked')
if item3.checkState(0) == QtCore.Qt.Checked:
print('item 3 is checked')
if __name__ == "__main__":
import sys
app = QtGui.QApplication(sys.argv)
ui = window()
ui.show()
sys.exit(app.exec_())
使用上面的代码,我设法创建了可勾选的框.但是,当我运行程序时,我想打印用户检查的项目.据我了解,我需要使用 event
或 signal
,但我不确定如何设置 signal
.我找到了一个示例代码,显示了 MousePressEvent
的使用,但我不确定如何使用 python
实现该代码.
With the code above, I managed to create checkable boxes. However when I run the program I want to print the item that is checked if a user checks it. To my understanding, I would need to use an event
or signal
but i'm not sure as to how I would set up the signal
. I found an example code showing the use of MousePressEvent
but i'm not sure as to how I would implement that code using python
.
示例如下:
#include <QtGui>
class TreeWidget : public QTreeWidget
{
public:
TreeWidget()
{
setColumnCount(1);
item1 = new QTreeWidgetItem(this);
item1->setExpanded(true);
item1->setFlags(item1->flags() | Qt::ItemIsUserCheckable);
item1->setCheckState(0, Qt::Checked);
item1->setText(0, "item 1");
item2 = new QTreeWidgetItem(item1);
item2->setFlags(item2->flags() | Qt::ItemIsUserCheckable);
item2->setCheckState(0, Qt::Checked);
item2->setText(0, "item 2");
item3 = new QTreeWidgetItem(this);
item3->setText(0, "item 3");
item3->setFlags(item3->flags() | Qt::ItemIsUserCheckable);
item3->setCheckState(0, Qt::Checked);
}
void mousePressEvent(QMouseEvent *event)
{
QModelIndex indexClicked = indexAt(event->pos());
if(indexClicked.isValid()) {
QRect vrect = visualRect(indexClicked);
int itemIndentation = vrect.x() - visualRect(rootIndex()).x();
QRect rect = QRect(header()->sectionViewportPosition(0) + itemIndentation
, vrect.y(), style()->pixelMetric(QStyle::PM_IndicatorWidth), vrect.height());
if(rect.contains(event->pos())) {
qDebug() << "checkbox clicked";
QTreeWidget::mousePressEvent(event);
return;
} else {
QTreeWidget::mousePressEvent(event);
}}}
private:
QTreeWidgetItem *item1;
QTreeWidgetItem *item2;
QTreeWidgetItem *item3;
QTreeWidgetItem *item4;
};
int main(int argc, char **argv)
{
QApplication app(argc, argv);
TreeWidget box;
box.show();
return app.exec();
}
推荐答案
使用 itemClicked
信号:
Using itemClicked
signal:
class window(QtGui.QMainWindow):
def __init__(self, parent=None):
super(window, self).__init__(parent)
self.TreeWidget = QtGui.QTreeWidget()
self.TreeWidget.setColumnCount(1)
# self.item1/2/3 = .... save reference to the items
# to access them in the callback (check_status)
item1 = self.item1 = QtGui.QTreeWidgetItem(["Item 1"])
item1.setCheckState(0, QtCore.Qt.Checked)
item2 = self.item2 = QtGui.QTreeWidgetItem(["Item 2"])
item2.setCheckState(0, QtCore.Qt.Unchecked)
item3 = self.item3 = QtGui.QTreeWidgetItem(["Item 3"])
item3.setCheckState(0, QtCore.Qt.Unchecked)
self.TreeWidget.addTopLevelItem(item1)
self.TreeWidget.addTopLevelItem(item2)
self.TreeWidget.addTopLevelItem(item3)
self.setCentralWidget(self.TreeWidget)
# connect the itemClicked signal to the callback check_status.
self.TreeWidget.itemClicked.connect(self.check_status)
def check_status(self):
if self.item1.checkState(0) == QtCore.Qt.Checked:
print('item 1 is checked')
if self.item2.checkState(0) == QtCore.Qt.Checked:
print('item 2 is checked')
if self.item3.checkState(0) == QtCore.Qt.Checked:
print('item 3 is checked')
这篇关于如何检查复选框是选中还是未选中?(在 QTreeWidget 中)的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文