如何在QTextEdit中调整图像大小? [英] How to resize an image in a QTextEdit?

问题描述

如何单击图像，从图像的一角抓住，并在QTextEdit中调整图像的大小?还是至少如何获取光标/为了改变宽度和高度而选择的图像?

How to click on the image, hold from a corner of it, and resize the image in the QTextEdit? Or at least how to get an image under cursor/that is selected in order to change width and hight?

推荐答案

这是我的实现方式:

void AdvancedTextEdit::resizeImage()
{

    QTextBlock currentBlock = m_textEdit->textCursor().block();
    QTextBlock::iterator it;

    for (it = currentBlock.begin(); !(it.atEnd()); ++it)
    {

             QTextFragment fragment = it.fragment();



             if (fragment.isValid())
             {

                 if(fragment.charFormat().isImageFormat ())
                 {
                      QTextImageFormat newImageFormat = fragment.charFormat().toImageFormat();

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

                      newImageFormat.setWidth(size.first);
                      newImageFormat.setHeight(size.second);

                      if (newImageFormat.isValid())
                      {
                          //QMessageBox::about(this, "Fragment", fragment.text());
                          //newImageFormat.setName(":/icons/text_bold.png");
                          QTextCursor helper = m_textEdit->textCursor();

                          helper.setPosition(fragment.position());
                          helper.setPosition(fragment.position() + fragment.length(),
                                              QTextCursor::KeepAnchor);
                          helper.setCharFormat(newImageFormat);
                      }
                  }
              }
       }
}

当然，我还实现了ResizeImageDialog对话框的 getNewSize(this，newImageFormat.width()，newImageFormat.height()); 函数，该函数获取图像的当前大小并允许用户更改大小，并以QPair的形式返回图像的新大小.这并不难.请参见此处用于实现对话框.

Of course I have implemented also the ResizeImageDialog dialog's getNewSize(this, newImageFormat.width(), newImageFormat.height()); function that gets the current size of image and lets user to chnage the size, and returns the new size of image as a QPair. This is not hard to do. See here for the implementation of the dialog.

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