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如何将静态方法添加到QInputDialog以返回自定义数据?

static-methods dialog qt c++

Narek · 技术社区 · 15 年前

QString QInputDialog::getText ( QWidget * parent, const QString & title, 
    const QString & label, QLineEdit::EchoMode mode = QLineEdit::Normal,
    const QString & text = QString(), bool * ok = 0, 
    Qt::WindowFlags flags = 0 )   [static]

此函数用于调用对话框get并返回将插入QLine编辑中的文本。所以我想创建一个getData静态方法,它返回一个数据结构(比如QPair)并像 QInputDialog::getText() . 我试过了,但做不到。我该怎么做?

2 回复 | 直到 15 年前

Narek 15 年前

我已经做到了,但我张贴的人需要这个。下面是一个对话框的示例,用于调整图像的大小。更准确地说,它是用来表示用户的图像的当前大小,并为他/她提供一个界面,以改变大小,并获得一个QPair新的大小。

class ResizeImageDialog : public QDialog
{
    Q_OBJECT

double                   m_ratio;

QLabel                  *m_widthLabel;
QLabel                  *m_hightLabel;
QDoubleSpinBox          *m_widthSpinBox;
QDoubleSpinBox          *m_hightSpinBox;
QCheckBox               *m_keepRatioCheckBox;

QPushButton             *m_okButton;
QPushButton             *m_cancelButton;

QHBoxLayout             *m_widthLayout;
QHBoxLayout             *m_hightLayout;
QHBoxLayout             *m_buttonLayout;
QVBoxLayout             *m_generalLayout;

private slots:
    void widthChanged(double width);
    void hightChanged(double hight);

public:
    ResizeImageDialog(QWidget * parent = 0, double imageWidth = 100.0, double imageHight = 100.0):QDialog(parent)
    {
    m_widthLabel = new QLabel("Image width");
    m_hightLabel = new QLabel("Image hight");

    m_widthSpinBox = new QDoubleSpinBox;
    m_widthSpinBox->setMaximum(1500);
    m_widthSpinBox->setValue(imageWidth);
    connect(m_widthSpinBox, SIGNAL(valueChanged(double)), this, SLOT(widthChanged(double)));


    m_hightSpinBox = new QDoubleSpinBox;
    m_hightSpinBox->setMaximum(1500);
    m_hightSpinBox->setValue(imageHight);
    connect(m_hightSpinBox, SIGNAL(valueChanged(double)), this, SLOT(hightChanged(double)));

    m_ratio = imageWidth/imageHight;


    m_keepRatioCheckBox = new QCheckBox("Keep ratio",this);
    m_keepRatioCheckBox->setChecked(true);


    m_widthLayout = new QHBoxLayout;
    m_widthLayout->addWidget(m_widthLabel);
    m_widthLayout->addWidget(m_widthSpinBox);

    m_hightLayout  = new QHBoxLayout;
    m_hightLayout->addWidget(m_hightLabel);
    m_hightLayout->addWidget(m_hightSpinBox);

    m_okButton = new QPushButton("OK");
    connect(m_okButton, SIGNAL(clicked()), this, SLOT(accept()));

    m_cancelButton = new QPushButton("Cancel");
    connect(m_cancelButton, SIGNAL(clicked()), this, SLOT(reject()));

    m_buttonLayout = new QHBoxLayout;
    m_buttonLayout->addStretch();
    m_buttonLayout->addWidget(m_okButton);
    m_buttonLayout->addWidget(m_cancelButton);

    m_generalLayout = new QVBoxLayout;
    m_generalLayout->addLayout(m_widthLayout);
    m_generalLayout->addLayout(m_hightLayout);
    m_generalLayout->addWidget(m_keepRatioCheckBox);
    m_generalLayout->addLayout(m_buttonLayout);
    setLayout(m_generalLayout);

    setMaximumSize(300, 300);
    setModal(true);
    //resize(670,630);
    setWindowTitle(tr("Resize Image"));
    setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
}

static QPair<double, double> getNewSize(QWidget * parent = 0, double imageWidth = 100.0, double imageHight = 100.0)
{
    ResizeImageDialog dlg(parent, imageWidth, imageHight);
    dlg.exec();



    QPair<double, double> size;
    size.first = dlg.m_widthSpinBox->value();
    size.second = dlg.m_hightSpinBox->value();
    return size;
}
};

现在你可以做到:

 QPair<double, double> size = ResizeImageDialog::getNewSize(this, newImageFormat.width(), newImageFormat.height());

Arnold Spence 15 年前

我不确定您遇到的问题是什么,但一般来说,您希望创建一个继承 QInputDialog . 添加一个静态方法, getPairedText() ,签名与 getText() 但它返回一个 QPair 获取文本() 返回,将字符串解析为 QPair公司 把它还给我。

如果你在实现这一点上有任何具体问题,请在下面的评论中提问,我将尝试在我的答案中添加更多细节。