qtextedit - 调整大小以适应

Question

我有一个QTextEdit充当"显示器"(可编辑为假).它显示的文字是自动换行的.现在我希望设置此文本框的高度,以便文本完全适合(同时也尊重最大高度).

基本上布局下面的小部件(在相同的垂直布局中)应该获得尽可能多的空间.

如何才能最轻松地实现这一目标？

Answer 1

我找到了一个非常稳定,简单的解决方案QFontMetrics!

from PyQt4 import QtGui

text = ("The answer is QFontMetrics\n."
        "\n"
        "The layout system messes with the width that QTextEdit thinks it\n"
        "needs to be.  Instead, let's ignore the GUI entirely by using\n"
        "QFontMetrics.  This can tell us the size of our text\n"
        "given a certain font, regardless of the GUI it which that text will be displayed.")

app = QtGui.QApplication([])

textEdit = QtGui.QPlainTextEdit()
textEdit.setPlainText(text)
textEdit.setLineWrapMode(True)      # not necessary, but proves the example

font = textEdit.document().defaultFont()    # or another font if you change it
fontMetrics = QtGui.QFontMetrics(font)      # a QFontMetrics based on our font
textSize = fontMetrics.size(0, text)

textWidth = textSize.width() + 30       # constant may need to be tweaked
textHeight = textSize.height() + 30     # constant may need to be tweaked

textEdit.setMinimumSize(textWidth, textHeight)  # good if you want to insert this into a layout
textEdit.resize(textWidth, textHeight)          # good if you want this to be standalone

textEdit.show()

app.exec_()

(原谅我,我知道你的问题是关于C++,而我正在使用Python,但是Qt他们几乎都是相同的事情).

Answer 2

底层文本的当前大小可以通过以下方式获得

QTextEdit::document()->size();

我相信使用它我们可以相应地调整小部件的大小。

#include <QTextEdit>
#include <QApplication>
#include <iostream>
using namespace std;

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QTextEdit te ("blah blah blah blah blah blah blah blah blah blah blah blah");
    te.show();
    cout << te.document()->size().height() << endl;
    cout << te.document()->size().width() << endl;
    cout <<  te.size().height() << endl;
    cout <<  te.size().width() << endl;
// and you can resize then how do you like, e.g. :
    te.resize(te.document()->size().width(), 
              te.document()->size().height() + 10);
    return a.exec();    
}