QtWidgets应用程序的虚拟键盘或屏幕键盘? [英] Virtual keyboard or onscreen keyboard for QtWidgets applications?

问题描述

我将像这样在基于窗口小部件的应用程序中部署qtvirtualkeyboard:

I'm going to deploy the qtvirtualkeyboard in my widget-based application like so:

#include <QtWidgets>

int main(int argc, char *argv[]) {
    qputenv("QT_IM_MODULE", QByteArray("qtvirtualkeyboard"));
    QApplication app(argc, argv);
    QMainWindow window;
    QLineEdit input(&window);
    input.move(250, 250);
    window.show();
    return app.exec();
}

但是唯一的问题是虚拟键盘输入面板隐藏了底层小部件并覆盖了它们！

But the only issue is that the virtual keyboard input panel hides the underlying widgets and cover them!

我应该如何实现呢?

针对基于窗口小部件的应用程序是否有任何文档或解决方案?

Is there any document or solution for widgets-based applications?

推荐答案

终于得到了解决方案！

Finally got the solution!

您只需要调用QGuiApplication::inputMethod()即可获取应用程序范围的Qt输入法，然后调用 QInputMethod::keyboardRectangle() 和 QInputMethod::isVisible() 以获得输入法属性，然后保留基于小部件位置和键盘坐标的计算，这是一个可以共享的完整示例:

You just need to call QGuiApplication::inputMethod() to get the application-wide Qt input method and then call QInputMethod::keyboardRectangle() and QInputMethod::isVisible() to get input method properties then remain a calculation based on your widget position and keyboard coordinate, here is a full-working sample to share:

lineedit.h:

class LineEdit :public QLineEdit {
    Q_OBJECT

public:
    LineEdit(QWidget *parent = nullptr);
    LineEdit(const QString&, QWidget *parent = nullptr);

protected:
    bool event(QEvent*) override;

private:
    bool _moved = false;
    int _lastDiff = 0;
};

lineedit.cpp:

LineEdit::LineEdit(QWidget *parent) :QLineEdit(parent) {
    setAttribute(Qt::WA_InputMethodEnabled, true);
    setInputMethodHints(inputMethodHints() | Qt::InputMethodHint::ImhDigitsOnly);
}

LineEdit::LineEdit(const QString& txt, QWidget *parent) : QLineEdit(txt, parent) {
    setAttribute(Qt::WA_InputMethodEnabled, true);
    setInputMethodHints(inputMethodHints() | Qt::InputMethodHint::ImhDigitsOnly);
}

bool LineEdit::event(QEvent* e) {
    const auto keyboard_rect = QGuiApplication::inputMethod()->keyboardRectangle();
    const auto keyboard_visible = QGuiApplication::inputMethod()->isVisible();
    const auto global_y = QWidget::mapToGlobal(rect().topLeft()).y() + height();
    const auto k_global_y = keyboard_rect.topLeft().y();
    const auto diff = k_global_y - global_y;
    const auto need_to_move = diff < 0;

    /* move main widget */
    if (keyboard_visible && !_moved && need_to_move) {
        _moved = true;
        _lastDiff = diff;
        const auto g = parentWidget()->frameGeometry();
        parentWidget()->move(g.x(), g.y() - qAbs(_lastDiff));
    }
    /* roll back */
    if (!keyboard_visible && _moved) {
        _moved = false;
        const auto g = parentWidget()->frameGeometry();
        parentWidget()->move(g.x(), g.y() + qAbs(_lastDiff));
    }
    return QLineEdit::event(e);
}

main.cpp:

#include <QtWidgets>

#define W 1024
#define H 768

int main(int argc, char *argv[]) {
    qputenv("QT_IM_MODULE", QByteArray("qtvirtualkeyboard"));
    QApplication app(argc, argv);

    QMainWindow window(nullptr, Qt::FramelessWindowHint);

    LineEdit lineedit1(&window);
    lineedit1.move(100, 450);

    LineEdit lineedit2(&window);
    lineedit2.move(100, 100);

    window.resize(W, H);
    window.show();
    return app.exec();
}

结果:

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