2021-08-05 Qt会在删除父对象的时候自动删除其所属的所有子对象

#pragma once

#include <QDialog>

class QCheckBox;
class QLabel;
class QLineEdit;
class QPushButton;

class FindDialog :
	public QDialog
{
	Q_OBJECT
public:
	FindDialog(QWidget* parent = 0);
	virtual ~FindDialog();

signals:
	void findNext(const QString &str, Qt::CaseSensitivity cs);
	void findPrevious(const QString& str, Qt::CaseSensitivity cs);

private slots:
	void findClicked();
	void enableFindButton(const QString& text);

private:
	QLabel* label;
	QLineEdit* lineEdit;
	QCheckBox* caseCheckBox;
	QCheckBox* backwardCheckBox;
	QPushButton* findButton;
	QPushButton* closeButton;
};

FindDialog::FindDialog(QWidget* parent) :QDialog(parent)
{
	label = new QLabel(tr("Find &what:"));
	lineEdit = new QLineEdit;
	label->setBuddy(lineEdit);

	caseCheckBox = new QCheckBox(tr("Match &case"));
	backwardCheckBox = new QCheckBox(tr("Search &backward"));

	findButton = new QPushButton(tr("&Find"));
	findButton->setDefault(true);
	findButton->setEnabled(false);

	closeButton = new QPushButton(tr("Close"));

	connect(lineEdit, SIGNAL(textChanged(const QString&)),
		this, SLOT(enableFindButton(const QString&)));
	connect(findButton, SIGNAL(clicked()),
		this, SLOT(findClicked()));
	connect(closeButton, SIGNAL(clicked()),
		this, SLOT(close()));

	QHBoxLayout* topLeftLayout = new QHBoxLayout;
	topLeftLayout->addWidget(label);
	topLeftLayout->addWidget(lineEdit);

	QVBoxLayout* leftLayout = new QVBoxLayout;
	leftLayout->addLayout(topLeftLayout);
	leftLayout->addWidget(caseCheckBox);
	leftLayout->addWidget(backwardCheckBox);

	QVBoxLayout* rightLayout = new QVBoxLayout;
	rightLayout->addWidget(findButton);
	rightLayout->addWidget(closeButton);
	rightLayout->addStretch();

	QHBoxLayout* mainLayout = new QHBoxLayout;
	mainLayout->addLayout(leftLayout);
	mainLayout->addLayout(rightLayout);
	setLayout(mainLayout);

	setWindowTitle("Find");
	setFixedHeight(sizeHint().height());
}


FindDialog::~FindDialog()
{
}

由于在创建这个对话框中的窗口部件和布局时使用的是new，所以需要写一个能够调用delete的析构函数，以便可以删除所创建的每一个窗口部件和布局。但是这样做并不是必需的，因为Qt会在删除父对象的时候自动删除其所属的所有子对象，也就会删除FindDialog中作为其子孙的所有子窗口部件和子布局。

标签：findButton,const,Qt,删除,FindDialog,05,tr,addWidget,new
来源： https://blog.csdn.net/weixin_44819948/article/details/119423963