python pyqt5 QLineEdit文本框内增加关闭按钮实现清除文本框内容

最新推荐文章于 2024-08-10 15:23:11 发布

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最新推荐文章于 2024-08-10 15:23:11 发布

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分类专栏： python-pyqt5 文章标签： qt 开发语言 python

本文链接：https://blog.youkuaiyun.com/cy19890616/article/details/134644634

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功能：

1.文本框内增加关闭按钮实现清除文本框内容

2.可以取消#self.textChanged.connect(self.updateCloseButton) 该行备注实现有输入才显示关闭按钮

3.可使用self.dev_tree_search = LineEdit_close('搜索...') 的方式设置占位文本

4.可与QTreeWidget联动实现搜索tree，具体参考python pyqt5 QTreeWidget 实现模糊查找子项-优快云博客

效果图

代码

from PyQt5 import QtWidgets, QtGui, QtCore
import sys


class LineEdit_close(QtWidgets.QLineEdit):
    def __init__(self, placeholder_text, parent=None):
        super(LineEdit_close, self).__init__(parent)

        self.setPlaceholderText(placeholder_text)

        self.clearButton = QtWidgets.QToolButton(self)
        self.clearButton.setIcon(QtGui.QIcon("images//close.png"))
        self.clearButton.setCursor(QtCore.Qt.ArrowCursor)
        self.clearButton.setStyleSheet("QToolButton { border: none; padding: 0; }")
        self.clearButton.setGeometry(self.rect().adjusted(self.width() - 20, 0, 0, 0))
        self.clearButton.clicked.connect(self.clear)
        self.clearButton.setVisible(True)

        #self.textChanged.connect(self.updateCloseButton)

    def updateCloseButton(self, text):
        if text:
            self.clearButton.setVisible(True)
        else:
            self.clearButton.setVisible(False)

    def resizeEvent(self, event):
        super().resizeEvent(event)
        button_size = self.clearButton.sizeHint()
        frame_width = self.style().pixelMetric(QtWidgets.QStyle.PM_DefaultFrameWidth)
        self.clearButton.setGeometry(
            self.rect().adjusted(self.width() - button_size.width() - frame_width, 0, -frame_width, 0))


class MainWindow(QtWidgets.QMainWindow):
    def __init__(self):
        super().__init__()

        self.treeWidget = QtWidgets.QTreeWidget()

        self.setCentralWidget(self.treeWidget)

        self.toolbar = self.addToolBar("Search")

        search_box = LineEdit_close('搜索...')
        self.toolbar.addWidget(search_box)

        self.treeWidget.setHeaderLabels(["Name", "Age"])
        for i in range(5):
            item = QtWidgets.QTreeWidgetItem(["Item {}".format(i), str(i)])
            self.treeWidget.addTopLevelItem(item)
            for j in range(3):
                child_item = QtWidgets.QTreeWidgetItem(["Child item {}".format(j), str(j)])
                item.addChild(child_item)


if __name__ == '__main__':
    import sys

    app = QtWidgets.QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec_())