在QWizard :: addPage（）上“QObject :: connect：尝试绑定非信号Class :: signal”警告

Question

当尝试在派生的QWizard的构造函数中添加带有自定义Q_PROPERTY的派生QWizardPage时，我得到了以下最小示例的运行时警告：

  

QObject :: connect：尝试绑定非信号TreeView :: ndex_changed [sic]

在我的原始项目中，字段“index”仍然按预期工作，因此我提供了一个仅发出警告的示例。我怎样才能摆脱这个警告？

我正在使用Qt 5.10.1和gcc 5.3.0（MinGW）。

最小的例子

的CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

set(CMAKE_AUTOMOC ON)
set(CMAKE_INCLUDE_CURRENT_DIR ON)
find_package(Qt5Widgets)
project(QWizard)
add_executable(${PROJECT_NAME}
    main.cpp
    TreeView.cpp
    Wizard.cpp
    WizardPage.cpp
)
target_link_libraries(${PROJECT_NAME}
    Qt5::Widgets
)

的main.cpp

#include "Wizard.h"
#include <QApplication>

int main(int argc, char *argv[]) {
  QApplication application{argc, argv};
  Wizard wizard{};
  wizard.show();
  return application.exec();
}

TreeView.h

#pragma once

#include <QTreeView>

class TreeView : public QTreeView {
    Q_OBJECT
    Q_PROPERTY(QModelIndex index READ index NOTIFY index_changed)

  public:
    explicit TreeView(QWidget* parent = nullptr);

    QModelIndex index() const;

  signals:
    void index_changed();
};

TreeView.cpp

#include "TreeView.h"

TreeView::TreeView(QWidget *parent) : QTreeView(parent) {
  connect(this, &QTreeView::clicked, [&]() { emit index_changed(); });
}

QModelIndex TreeView::index() const { return currentIndex(); }

Wizard.h

#pragma once

#include <QWizard>

class Wizard : public QWizard {
  public:
    explicit Wizard(QWidget* parent = nullptr);
};

Wizard.cpp

#include "Wizard.h"
#include "WizardPage.h"

Wizard::Wizard(QWidget *parent) : QWizard(parent) {
  auto *page = new WizardPage{this};
  addPage(page);
}

WizardPage.h

#pragma once

#include <QWizardPage>

class WizardPage : public QWizardPage {
  public:
    explicit WizardPage(QWidget* parent = nullptr);
};

WizardPage.cpp

#include "WizardPage.h"
#include "TreeView.h"
#include <QVBoxLayout>

WizardPage::WizardPage(QWidget *parent) : QWizardPage(parent) {
  auto *tree_view = new TreeView{this};
  registerField("index*", tree_view, "index", "index_changed");
  auto *layout = new QVBoxLayout{this};
  layout->addWidget(tree_view);
  setLayout(layout);
}

Answer 1

我认为在registerField()中您应该使用SIGNAL(index_changed())代替"index_changed"

通过registerField()

进行以下调用

registerField("index*", tree_view, "index", SIGNAL(index_changed()));