在qt中显示隐藏的dockwidget

时间:2013-02-05 23:54:25

标签: qt widget hide show dock

嗨,我创建一个dockwidget,我将其隐藏起来。问题是之后我无法显示它,而我可以从isHidden()函数正确获取状态。奇怪的是,如果我启动dockwidget没有隐藏,它的工作完美。我正在包含一个再现这种奇怪行为的例子。

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QtGui>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
private slots:

    void showDock();
private:
    Ui::MainWindow *ui;

    QDockWidget *dock;
    QPushButton *button;


};

#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

//    QMainWindow mainWindow;
//    QDockWidget *dock = new QDockWidget(&mainWindow);
    QDialog *dockDialog = new QDialog(this); // <---------edit: you need to create a parent widget for the dock
    dock = new QDockWidget(dockDialog);

    dock->setStyleSheet("QDockWidget { font: bold }");
    dock->setFloating(true);
    dock->setFeatures(QDockWidget::DockWidgetVerticalTitleBar | QDockWidget::DockWidgetFloatable | QDockWidget::DockWidgetMovable);
    QAbstractButton *floatButton = dock->findChild<QAbstractButton*>("qt_dockwidget_floatbutton");
    if(floatButton)
        floatButton->hide();

    dock->setAllowedAreas( Qt::NoDockWidgetArea );
    dock->setWindowTitle("Tools");

    this->addDockWidget(Qt::TopDockWidgetArea, dock, Qt::Vertical);

    QMainWindow *window = new QMainWindow(dock); // <------edit: set the dock to be the parent for the window
    window->setWindowFlags(Qt::Widget);
    QToolBar *bar = new QToolBar(window);

    bar->setMovable(false);
    bar->addAction("Select");
    bar->addAction("Polygon");
    bar->addAction("Brush");
    bar->addAction("Erazer");
    bar->addSeparator();
    bar->addAction("Mark");
    bar->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
    bar->setOrientation(Qt::Vertical);

    window->addToolBar(Qt::LeftToolBarArea, bar);
    window->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);

    window->setParent(dock);
    dock->setWidget(window);
    dock->hide();            // <------------ comment this line and it will work, edit: you do not need to do that anymore, it is working nicely now

    button = new QPushButton("show", this);
    button->setCheckable(true);

    QObject::connect(button, SIGNAL(clicked()), this, SLOT(showDock()));
}

MainWindow::~MainWindow()
{
    delete ui;
}


void MainWindow::showDock()
{
//    qDebug() << "hello";
    if(button->isChecked()){
        if(dock->isHidden()){
            qDebug() << "hidden";
        dock->setFloating(true); // <-----edit: you need to add these lines in order to be able to see the dialog that contains the dock widget, i do not know why i need to that again since in the initialization i already specifying that my dock is floatable
        QAbstractButton *floatButton = dock->findChild<QAbstractButton*>("qt_dockwidget_floatbutton"); // <---------edit: add this lines in order to get rid off the floating button
        if(floatButton)
            floatButton->hide(); // <----edit: the same as previous
        dock->show();
        }
    }

    if(!button->isChecked()){
        if(!dock->isHidden()){
            qDebug() << "not hidden";
            dock->hide();
        }
    }
}

因为现在是上面的代码,dockwidget没有出现在屏幕上。如果你试图评论我在mainwindow.cpp中指定的行,它可以工作,但重点是我想启动dockwidget隐藏。是否有人知道发生了什么。

感谢。

2 个答案:

答案 0 :(得分:0)

QDock控件的父级应该是您的window小部件,而不是MainWindow类的对象。

所以,你需要替换它:

 dock = new QDockWidget(this);

用这个:

QMainWindow *window = new QMainWindow(0); // I smell a potential leak here (set the parent!)
dock = new QDockWidget(window);

在第一种情况下按“显示”按钮时,控件也可见,但它位于窗口外的某个位置,因此您可能看不到它。此外,无需在已继承QMainWindow的类中创建单独的QMainWindow实例。

答案 1 :(得分:0)

我看到你展示()/ hide()你的qdoc​​kwidget。我自己没有尝试过,但也许你应该隐藏并用QDockWidget::toggleViewAction方法显示qdockwidget。