替代QDockWidget的小部件，而没有删除以前的窗口

Substitute widget of QDockWidget without deletion of previous

本文关键字：删除 窗口 QDockWidget 小部 替代      更新时间：2023-10-16

我想替换qdockwidget*的窗口小部件(qwidget*(，但请致电setWidget((，删除先前的窗口小部件。如何防止此删除？

QDockWidget* dw = new QDockWidget;
QWidget* tw1 = new TestWidget;
QWidget* tw2 = new TestWidget;
dw->setWidget(tw1);
dw->setWidget(tw2); // tw1 deleted here
delete dw;
// I want to use tw1 here, but it died

testwidget只是检查删除时刻的测试：

class TestWidget : public QWidget {
public:
    TestWidget(QWidget* parent = nullptr)
        : QWidget(parent)
    {
        cout << "TestWidget() " << this << endl;
    }
    ~TestWidget() override {
        cout << "~TestWidget() " << this << endl;
    }
};

QDockWidget* dw = new QDockWidget;
QWidget* tw1 = new TestWidget;
QWidget* tw2 = new TestWidget;
dw->setWidget(tw1);
dw->setWidget(tw2);
tw1->setParent(0);
delete dw; // dw and tw2 deleted here, but not tw1
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