有什么办法可以在HTML中插入QPixmap对象? [英] is there any way to insert QPixmap object in html?

问题描述

简单情况:我有一个对象，该对象具有QPixmap成员.首先创建对象(现在pixmap为null)，然后从数据库中读取pixmap并将其插入对象中.我需要将pixmap插入html代码()中并在QLabel中显示该html代码，但是我不知道如何制作它，因为pixmap的路径未知.

我知道如何从资源文件和硬盘上的文件插入图像，但是不是这种情况.我在qt 3.3.4上使用了QMimeSourceFactory类，但在4.6.2上已弃用.助手说:改为使用资源系统".但是资源系统可以通过app进行编译，但是需要在运行时读取图像.

我将不胜感激.谢谢.

解决方案

我知道这是一个老问题，但这是另一个选择.

我在QToolTip中的图像上也遇到了类似的问题.我可以从磁盘上精细地引用图像，但是默认的缩放行为是不平滑的，看起来很糟糕.我重新实现了自己的工具提示类，并使用了自定义的QTextDocument类，以便可以覆盖QTextDocument::loadResource().

根据您的情况，您可以在img src属性中指定一个关键字.然后在loadResource()的实现中，返回用关键字标识的QPixmap.

这是基本代码(在此情况下未经测试):

class MyTextDocument : public QTextDocument
{
protected:
  virtual QVariant loadResource(int type, const QUrl &name)
  {
    QString t = name.toString();
    if (t == myKeyword)
      return myPixmap;
    return QTextDocument::loadResource(type, name);
  }
};

class MyLabel : public QFrame
{
public:
  MyLabel(QWidget *parent)
  : QFrame(parent)
  , m_doc(new MyTextDocument(this))
  { }

  virtual void paintEvent(QPaintEvent *e)
  {
    QStylePainter p(this);
    // draw the frame if needed

    // draw the contents
    m_doc->drawContents(&p);
  }
};

Simple situation: I have an object, which has a QPixmap member. Object first created (pixmap is null now), then pixmap readed from data base and inserted in object. I need to insert that pixmap in html code () and display that html code in a QLabel but I have no idea how to make it, because pixmap's path is unknown.

I know how to insert images from resource files and from files on my hard-disk, but it isn't that case. I was using QMimeSourceFactory class on qt 3.3.4, but on 4.6.2 it is deprecated. Assistant says: "Use resource system instead". But resource system compiles with app, but it is needed to read images during runtime.

I will be grateful for any help. Thanks.

解决方案

I know this is an old question, but here is another option.

I had a similar issue with images in QToolTip. I could reference images from disk fine, but the default scaling behavior is non-smooth and looked terrible. I reimplemented my own tooltip class and used a custom QTextDocument class so that I could override QTextDocument::loadResource().

In your case, you can specify a keyword in the img src attribute. Then in your implementation of loadResource() return the QPixmap identified with the keyword.

Here is the basic code (untested in this context):

class MyTextDocument : public QTextDocument
{
protected:
  virtual QVariant loadResource(int type, const QUrl &name)
  {
    QString t = name.toString();
    if (t == myKeyword)
      return myPixmap;
    return QTextDocument::loadResource(type, name);
  }
};

class MyLabel : public QFrame
{
public:
  MyLabel(QWidget *parent)
  : QFrame(parent)
  , m_doc(new MyTextDocument(this))
  { }

  virtual void paintEvent(QPaintEvent *e)
  {
    QStylePainter p(this);
    // draw the frame if needed

    // draw the contents
    m_doc->drawContents(&p);
  }
};

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