对 QMainWindow 的大小调整做出反应以调整小部件的大小

发布于 2024-12-03 04:37:22 字数 702 浏览 2 评论 0原文

我如何对 QMainWindow 的大小调整做出反应？我在 QScrollArea 中有 QTextBrowsers，我在创建它们时将它们调整为内容的大小（唯一应该滚动的是 QScrollArea ）。

现在一切正常，但如果我调整 mainWindow 的大小，QTextBrowsers 的高度不会改变，因为不会触发回流函数。

您是否有更好的想法来调整 QTextBrowser 以适应其内容？我当前的代码是：

void RenderFrame::adjustTextBrowser(QTextBrowser* e) const {
    e->document()->setTextWidth(e->parentWidget()->width());
    e->setMinimumHeight(e->document()->size().toSize().height());
    e->setMaximumHeight(e->minimumHeight());
}

parentWidget() 是必要的，因为在小部件本身上运行 width() 始终返回 100，无论实际大小如何。

原文

How do I react on the resize of a QMainWindow? I have QTextBrowsers in a QScrollArea and I adjust them to the size of the content on creating them (the only thing that should scroll is the QScrollArea).

Everything works for now, but if I resize the mainWindow, the height of the QTextBrowsers isn't changed, because the reflow function isn't triggered.

Do you have any better idea to adjust a QTextBrowser to it's content? My current code is:

void RenderFrame::adjustTextBrowser(QTextBrowser* e) const {
    e->document()->setTextWidth(e->parentWidget()->width());
    e->setMinimumHeight(e->document()->size().toSize().height());
    e->setMaximumHeight(e->minimumHeight());
}

The parentWidget() is necessary because running width() on the widget itself returns always 100, regardless of the real size.

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木有鱼丸 2024-12-10 04:37:22

如果只有文本或 html，您可以使用 QLabel 代替，因为它已经根据可用空间调整其大小。您必须使用：

label->setWordWrap(true);        
label->setTextInteractionFlags(Qt::TextBrowserInteraction);

才能获得与 QTextBrowser 几乎相同的行为。

如果您确实想使用QTextBrowser，您可以尝试这样的操作（改编自QLabel源代码）：

class TextBrowser : public QTextBrowser {
    Q_OBJECT
public:
    explicit TextBrowser(QWidget *parent) : QTextBrowser(parent) {
        // updateGeometry should be called whenever the size changes
        // and the size changes when the document changes        
        connect(this, SIGNAL(textChanged()), SLOT(onTextChanged()));

        QSizePolicy policy = sizePolicy();
        // Obvious enough ? 
        policy.setHeightForWidth(true);
        setSizePolicy(policy);
    }

    int heightForWidth(int width) const {
        int left, top, right, bottom;
        getContentsMargins(&left, &top, &right, &bottom);
        QSize margins(left + right, top + bottom);

        // As working on the real document seems to cause infinite recursion,
        // we create a clone to calculate the width
        QScopedPointer<QTextDocument> tempDoc(document()->clone());
        tempDoc->setTextWidth(width - margins.width());

        return qMax(tempDoc->size().toSize().height() + margins.height(),
                    minimumHeight());
    }
private slots:
    void onTextChanged() {
        updateGeometry();
    }
};

If there is only text or html, you could use QLabel instead, because it already adapts its size to the available space. You'll have to use:

label->setWordWrap(true);        
label->setTextInteractionFlags(Qt::TextBrowserInteraction);

to have almost the same behavior as a QTextBrowser.

If you really want to use a QTextBrowser, you can try something like this (adapted from QLabel source code):

class TextBrowser : public QTextBrowser {
    Q_OBJECT
public:
    explicit TextBrowser(QWidget *parent) : QTextBrowser(parent) {
        // updateGeometry should be called whenever the size changes
        // and the size changes when the document changes        
        connect(this, SIGNAL(textChanged()), SLOT(onTextChanged()));

        QSizePolicy policy = sizePolicy();
        // Obvious enough ? 
        policy.setHeightForWidth(true);
        setSizePolicy(policy);
    }

    int heightForWidth(int width) const {
        int left, top, right, bottom;
        getContentsMargins(&left, &top, &right, &bottom);
        QSize margins(left + right, top + bottom);

        // As working on the real document seems to cause infinite recursion,
        // we create a clone to calculate the width
        QScopedPointer<QTextDocument> tempDoc(document()->clone());
        tempDoc->setTextWidth(width - margins.width());

        return qMax(tempDoc->size().toSize().height() + margins.height(),
                    minimumHeight());
    }
private slots:
    void onTextChanged() {
        updateGeometry();
    }
};

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