Qt容器组件(二)之QWidgetStack、QMdiArea、QDockWidget

QT中有九种容器组件,分别是组合框QGroupBox、滚动区QScrollArea、工具箱QToolBox、选项卡QTabWidget、控件栈QWidgetStack、框架QFrame、组件QWidget、MDI窗口显示区QMdiArea、停靠窗口QDockWidget。
本博主要介绍:组合框QGroupBox、滚动区QScrollArea、工具箱QToolBox、选项卡QTabWidget

一、控件栈QWidgetStack

(1)属性

class Q_WIDGETS_EXPORT QStackedWidget : public QFrame
{
    Q_OBJECT

    Q_PROPERTY(int currentIndex READ currentIndex WRITE setCurrentIndex NOTIFY currentChanged)
    Q_PROPERTY(int count READ count)
    。。。。。。。。。。。。。。。
}

(2)常用函数

    int addWidget(QWidget *w);
    int insertWidget(int index, QWidget *w);
    void removeWidget(QWidget *w);

    QWidget *currentWidget() const;
    int currentIndex() const;

    int indexOf(QWidget *) const;
    QWidget *widget(int) const;
    int count() const;

(3)信号、槽

public Q_SLOTS:
    void setCurrentIndex(int index);
    void setCurrentWidget(QWidget *w);

Q_SIGNALS:
    void currentChanged(int);
    void widgetRemoved(int index);

(4)示例

#include "mainwindow.h"
#include <QApplication>
#include <QListWidget>
#include <QHBoxLayout>
#include <QLabel>
#include <QStackedWidget>
#include <QObject>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;

    QWidget *pWidget = new QWidget(&w);
    QHBoxLayout *pLayout = new QHBoxLayout(pWidget);
    QStackedWidget *pStackedWidget = new QStackedWidget(pWidget);

    QListWidget* pList = new QListWidget(pWidget);
    pList->insertItem(0, "label0");
    pList->insertItem(1, "label1");
    pList->insertItem(2, "label2");

    QLabel* pLabel0 = new QLabel("label0 test");
    QLabel* pLabel1 = new QLabel("label1 test");
    QLabel* pLabel2 = new QLabel("label2 test");
    pStackedWidget->addWidget(pLabel0);
    pStackedWidget->addWidget(pLabel1);
    pStackedWidget->addWidget(pLabel2);
    w.connect(pList, SIGNAL(currentRowChanged(int)), pStackedWidget, SLOT(setCurrentIndex(int)));

    pLayout->addWidget(pList);
    pLayout->addWidget(pStackedWidget,0,Qt::AlignCenter);
    pLayout->setStretchFactor(pList, 1);
    pLayout->setStretchFactor(pStackedWidget, 3);

    pWidget->setLayout(pLayout);
    w.setCentralWidget(pWidget);
    w.setWindowTitle("container test");
    w.setMinimumSize(50,50);
    w.show();
    return a.exec();
}
View Code

二、QMdiArea多文档区域组件

  QMdiArea组件中文称作“MDI窗口显示区”,MDI是 Multiple Document Interface的简称,中文意思是多文档界面,主要适用于完成一项工作时需要用到多个文件。QMainWindow是SDI(Signal Document Interface,单文档界面)每个开启的文件占据一个视窗,主要适用于所有工作没有太多文件参与的情况。

    QMdiSubWindow类继承自QWidget,主要用来创建MDI子窗体实例

 QtExmaple中提供了相应的例子:\Examples\Qt-5.9.3\widgets\mainwindows\mdi

 

(1)属性

  背景、窗口顺序(SubWindowList)、视图模式(SubWindowView/tabbedView)、tabsClosable、tabsMovable、TabPositionTabShape

class Q_WIDGETS_EXPORT QMdiArea : public QAbstractScrollArea
{
    Q_OBJECT
    Q_PROPERTY(QBrush background READ background WRITE setBackground)
    Q_PROPERTY(WindowOrder activationOrder READ activationOrder WRITE setActivationOrder)
    Q_PROPERTY(ViewMode viewMode READ viewMode WRITE setViewMode)
#if QT_CONFIG(tabbar)
    Q_PROPERTY(bool documentMode READ documentMode WRITE setDocumentMode)
    Q_PROPERTY(bool tabsClosable READ tabsClosable WRITE setTabsClosable)
    Q_PROPERTY(bool tabsMovable READ tabsMovable WRITE setTabsMovable)
#endif
#if QT_CONFIG(tabwidget)
    Q_PROPERTY(QTabWidget::TabShape tabShape READ tabShape WRITE setTabShape)
    Q_PROPERTY(QTabWidget::TabPosition tabPosition READ tabPosition WRITE setTabPosition)
    。。。。。。。。。。。
}

(2)常用函数、信号、槽

  QSize sizeHint() const Q_DECL_OVERRIDE;
    QSize minimumSizeHint() const Q_DECL_OVERRIDE;

    QMdiSubWindow *currentSubWindow() const;
    QMdiSubWindow *activeSubWindow() const;
    QList<QMdiSubWindow *> subWindowList(WindowOrder order = CreationOrder) const;

    QMdiSubWindow *addSubWindow(QWidget *widget, Qt::WindowFlags flags = Qt::WindowFlags());
    void removeSubWindow(QWidget *widget);

    QBrush background() const;
    void setBackground(const QBrush &background);

    WindowOrder activationOrder() const;
    void setActivationOrder(WindowOrder order);

    void setOption(AreaOption option, bool on = true);
    bool testOption(AreaOption opton) const;

    void setViewMode(ViewMode mode);
    ViewMode viewMode() const;
Q_SIGNALS:
    void subWindowActivated(QMdiSubWindow *);

public Q_SLOTS:
    void setActiveSubWindow(QMdiSubWindow *window);
    void tileSubWindows();
    void cascadeSubWindows();
    void closeActiveSubWindow();
    void closeAllSubWindows();
    void activateNextSubWindow();
    void activatePreviousSubWindow();

protected Q_SLOTS:
    void setupViewport(QWidget *viewport) Q_DECL_OVERRIDE;

(3)示例

  :\Examples\Qt-5.9.3\widgets\mainwindows\mdi

(4)注意Mdi子窗口的关闭

void MainWindow::closeEvent(QCloseEvent *event)
{
    m_pMdiArea->closeAllSubWindows();
    if (m_pMdiArea->currentSubWindow()) {
        event->ignore();
    } else {
        event->accept();
    }
}

三、QDockWidget停靠窗口

  QDockWidget停靠窗体组件,可以作为一个顶层窗口漂浮在桌面,主要作为辅助窗体出现在界面中,可以在很多IDE中看到停靠窗体。

    QDockWidget包含工具栏和内容区域,工具栏用于显示窗口标题,一个浮动按钮和一个关闭按钮。QDockWidget可以作为子窗口部件的封装,通过setWidget()设置子窗口部件。自定义的尺寸提示,最小和最大化尺寸以及尺寸策略都必须由子窗口部件来实现。QDockWidget会遵守它们,调整它自己的限制包括框架和工具栏。我们不应该为QDockWidget设置尺寸限制,因为它们根据QDockWidget是否锁住而改变,一个锁住的QDockWidget窗口部件不 包括框架和小的工具栏。

  

(1)属性

  属性包括:是否悬浮、停靠窗口特征(移动,关闭,悬浮)、停靠区域、窗口标题

class Q_WIDGETS_EXPORT QDockWidget : public QWidget
{
    Q_OBJECT

    Q_PROPERTY(bool floating READ isFloating WRITE setFloating)
    Q_PROPERTY(DockWidgetFeatures features READ features WRITE setFeatures NOTIFY featuresChanged)
    Q_PROPERTY(Qt::DockWidgetAreas allowedAreas READ allowedAreas
               WRITE setAllowedAreas NOTIFY allowedAreasChanged)
    Q_PROPERTY(QString windowTitle READ windowTitle WRITE setWindowTitle DESIGNABLE true)
    。。。。。。。。。。。。。。。。。
}

  窗口特征枚举:

enum DockWidgetFeature {
        DockWidgetClosable    = 0x01,
        DockWidgetMovable     = 0x02,
        DockWidgetFloatable   = 0x04,
        DockWidgetVerticalTitleBar = 0x08,

        DockWidgetFeatureMask = 0x0f,
        AllDockWidgetFeatures = DockWidgetClosable|DockWidgetMovable|DockWidgetFloatable, // ### Qt 6: remove
        NoDockWidgetFeatures  = 0x00,

        Reserved              = 0xff
    };

(2)信号、槽

Q_SIGNALS:
    void featuresChanged(QDockWidget::DockWidgetFeatures features);
    void topLevelChanged(bool topLevel);
    void allowedAreasChanged(Qt::DockWidgetAreas allowedAreas);
    void visibilityChanged(bool visible);
    void dockLocationChanged(Qt::DockWidgetArea area);

protected:
    void changeEvent(QEvent *event) Q_DECL_OVERRIDE;
    void closeEvent(QCloseEvent *event) Q_DECL_OVERRIDE;
    void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;
    bool event(QEvent *event) Q_DECL_OVERRIDE;
    void initStyleOption(QStyleOptionDockWidget *option) const;

(3)示例

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent)
    //ui(new Ui::MainWindow)
{
    setWindowTitle("MDI test");
    setMinimumSize(400,400);

    m_pFileAction = new QAction("open", this);

    m_pFileMenu = menuBar()->addMenu("File");
    m_pFileMenu->addAction(m_pFileAction);
    connect(m_pFileAction, SIGNAL(triggered(bool)), this, SLOT(openView()));

    m_pMdiArea = new QMdiArea(this);
    m_pMdiArea->setViewMode(QMdiArea::TabbedView);
    m_pMdiArea->setTabShape(QTabWidget::Triangular);
    m_pMdiArea->setTabPosition(QTabWidget::North);
    m_pMdiArea->setTabsMovable(true);
    m_pMdiArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
    m_pMdiArea->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);

    setCentralWidget(m_pMdiArea);

    QDockWidget* pDockWidget = new QDockWidget("dockwindow", this);
    pDockWidget->setFeatures(QDockWidget::DockWidgetFeature::AllDockWidgetFeatures);
    QWidget* pWidget = new QWidget(this);
    QVBoxLayout *pLayout = new QVBoxLayout(pWidget);
    QPushButton *pOkBtn = new QPushButton("ok");
    QPushButton *pCancelBtn = new QPushButton("cancel");
    pLayout->addWidget(pOkBtn);
    pLayout->addWidget(pCancelBtn);

    pDockWidget->setWidget(pWidget);

    addDockWidget(Qt::DockWidgetArea::RightDockWidgetArea, pDockWidget);
}

posted @ 2018-08-28 10:55  Fate0729  阅读(8944)  评论(0编辑  收藏  举报