【发布时间】：2019-11-01 09:45:37
【问题描述】：
我正在尝试将 qt 示例从 c++ 移植到 pyqt/pyside2。此示例显示了使用 QPropertyAnimation 对文本编辑字段进行隐藏/显示操作。
看起来并不复杂，但我还是想不通为什么它不能正常工作
主要思想是：textEdit 小部件通过按下 ">" 按钮“折叠”，并在再次按下按钮时返回。
这是我的python代码：
import PySide2
from PySide2.QtWidgets import *
from PySide2.QtCore import *
from PySide2.QtGui import *
import sys
class myWidget(QWidget):
def __init__(self):
super(myWidget, self).__init__()
self.m_deltaX = 0
self.m_isClosed = False
self.btn = QPushButton(self)
self.btn.setText(">")
self.btn.setCheckable(True)
self.btn.setFixedSize(QSize(25, 25))
self.btn.connect(SIGNAL("clicked()"), self.closeOpenEditor)
self.text1 = QTextEdit(self)
self.text1.setText("some sample text")
self.text2 = QTextEdit(self)
self.layout_btn = QVBoxLayout()
self.layout_btn.addWidget(self.btn)
self.layout_m = QHBoxLayout()
self.layout_m.addWidget(self.text1, 10)
self.layout_m.addSpacing(15)
self.layout_m.addLayout(self.layout_btn)
self.layout_m.setSpacing(0)
self.layout_m.addWidget(self.text2, 4)
self.setLayout(self.layout_m)
self.resize(800, 500)
def closeOpenEditor(self):
self.m_isClosed = self.btn.isChecked()
animation1 = QPropertyAnimation(self.text2, b"geometry")
if self.m_isClosed:
self.text2.setMaximumWidth(self.text2.width())
text2Start = int(self.text2.maximumWidth())
self.m_deltaX = text2Start
text2End = int(3)
animation1.setDuration(250)
animation1.setStartValue(text2Start)
animation1.setEndValue(text2End)
self.btn.setText("<")
else:
text2Start = int(self.text2.maximumWidth())
text2End = int(self.m_deltaX)
animation1.setDuration(250)
animation1.setStartValue(text2Start)
animation1.setEndValue(text2End)
self.btn.setText(">")
animation1.start()
def resizeEvent(self, event:QResizeEvent):
if not self.m_isClosed:
self.text2.setMaximumWidth(QWIDGETSIZE_MAX)
if __name__ == '__main__':
app = QApplication(sys.argv)
w = myWidget()
w.show()
sys.exit(app.exec_())
我还会添加c++代码：
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QTextEdit>
#include <QPushButton>
#include <QHBoxLayout>
class MyWidget : public QWidget
{
Q_OBJECT
QTextEdit *m_textEditor1;
QTextEdit *m_textEditor2;
QPushButton *m_pushButton;
QHBoxLayout *m_layout;
QVBoxLayout *m_buttonLayout;
int m_deltaX;
bool m_isClosed;
public:
MyWidget(QWidget * parent = 0);
~MyWidget(){}
void resizeEvent( QResizeEvent * event );
private slots:
void closeOrOpenTextEdit2(bool isClosing);
};
#endif // MAINWINDOW_H
main.cpp
#include <mainwindow.h>
#include <QPropertyAnimation>
#include <QApplication>
#include <QIcon>
MyWidget::MyWidget(QWidget * parent):QWidget(parent),m_deltaX(0)
{
m_pushButton = new QPushButton(this);
m_pushButton->setText(">");
m_pushButton->setCheckable(true);
m_pushButton->setFixedSize(25,25);
//m_pushButton->setStyleSheet("background-color: yellow;");
connect(m_pushButton, SIGNAL(clicked(bool)), this, SLOT(closeOrOpenTextEdit2(bool)));
m_textEditor1 = new QTextEdit(this);
m_textEditor1->setText("И рвется в пляс душа моя, головой я выбиваю дверцы...");
m_textEditor2 = new QTextEdit(this);
m_buttonLayout = new QVBoxLayout();
m_buttonLayout->addWidget(m_pushButton);
m_buttonLayout->addItem( new QSpacerItem(1, 1, QSizePolicy::Minimum, QSizePolicy::Expanding) );
m_layout = new QHBoxLayout;
m_layout->addWidget(m_textEditor1, 10);
m_layout->addSpacing(15);
m_layout->addLayout(m_buttonLayout);
m_layout->setSpacing(0);
m_layout->addWidget(m_textEditor2, 4);
setLayout(m_layout);
resize(800,500);
}
void MyWidget::closeOrOpenTextEdit2(bool isClosing)
{
m_isClosed = isClosing;
QPropertyAnimation *animation1 = new QPropertyAnimation(m_textEditor2, "maximumWidth");
if(isClosing) //close the second textEdit
{
m_textEditor2->setMaximumWidth(m_textEditor2->width());
int textEdit2_start = m_textEditor2->maximumWidth();
m_deltaX = textEdit2_start;
int textEdit2_end = 3;
animation1->setDuration(250);
animation1->setStartValue(textEdit2_start);
animation1->setEndValue(textEdit2_end);
m_pushButton->setText("<");
}
else //open
{
int textEdit2_start = m_textEditor2->maximumWidth();
int textEdit2_end = m_deltaX;
animation1->setDuration(250);
animation1->setStartValue(textEdit2_start);
animation1->setEndValue(textEdit2_end);
m_pushButton->setText(">");
//m_pushButton->setIcon()
}
animation1->start();
}
void MyWidget::resizeEvent( QResizeEvent * event )
{
if(!m_isClosed)
m_textEditor2->setMaximumWidth( QWIDGETSIZE_MAX );
}
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MyWidget w;
w.show();
return a.exec();
}
在我重写的代码中，它不想启动动画。您应该按两次按钮，然后它将永久折叠小部件而没有任何动画。所以你不能再次打开它。
我也收到了一些错误：
QPropertyAnimation::updateState(geometry, QTextEdit, ): 开始一个没有结束值的动画
和
NameError：名称“QWIDGETSIZE_MAX”未定义
【问题讨论】：