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Question

'm still quite a newbie with Python and PyQt so I have a really basic question. I have some text and images in a parent window inside a QTextEdit widget and I'm trying to copy all the content to a child window's QTextEdit. But for some reason I can't get it to copy the image - only the text is copied not the image. Here's a snippet of the code that's giving me trouble:

self.textEdit.selectAll() data = self.textEdit.createMimeDataFromSelection() self.child_window.textEdit.insertFromMimeData(data) # doesn't work with images

Here's is the small program that I'm trying to run:

import sys from PyQt4 import QtCore, QtGui from PyQt4.QtCore import * from PyQt4.QtGui import * class MyWindow(QtGui.QWidget): def __init__(self,parent=None): super(MyWindow,self).__init__(parent) self.textEdit = QtGui.QTextEdit(self) self.textEdit.setText("Hello World\n") self.pushButton = QtGui.QPushButton(self) self.pushButton.setText("Copy and paste to Child Window") self.pushButton.clicked.connect(self.click_copy_data) self.pushButton2 = QtGui.QPushButton(self) self.pushButton2.setText("Insert Image") self.pushButton2.clicked.connect(self.click_file_dialog) self.layoutVertical = QtGui.QVBoxLayout(self) self.layoutVertical.addWidget(self.textEdit) self.layoutVertical.addWidget(self.pushButton2) self.layoutVertical.addWidget(self.pushButton) self.setGeometry(150, 150,640, 480) self.child_window = CustomWindow(self) self.child_window.show() def click_copy_data(self): self.textEdit.selectAll() data = self.textEdit.createMimeDataFromSelection() self.child_window.textEdit.insertFromMimeData(data) def click_file_dialog(self): filePath = QtGui.QFileDialog.getOpenFileName( self, "Select an image", ".", "Image Files(*.png *.gif *.jpg *jpeg *.bmp)" ) if not filePath.isEmpty(): self.insertImage(filePath) def insertImage(self,filePath): imageUri = QtCore.QUrl(QtCore.QString("file://{0}".format(filePath))) image = QtGui.QImage(QtGui.QImageReader(filePath).read()) self.textEdit.document().addResource( QtGui.QTextDocument.ImageResource, imageUri, QtCore.QVariant(image) ) imageFormat = QtGui.QTextImageFormat() imageFormat.setWidth(image.width()) imageFormat.setHeight(image.height()) imageFormat.setName(imageUri.toString()) textCursor = self.textEdit.textCursor() textCursor.movePosition( QtGui.QTextCursor.End, QtGui.QTextCursor.MoveAnchor ) textCursor.insertImage(imageFormat) # This will hide the cursor blankCursor = QtGui.QCursor(QtCore.Qt.BlankCursor) self.textEdit.setCursor(blankCursor) class CustomWindow(QtGui.QDialog): def __init__(self,parent=None): super(CustomWindow,self).__init__(parent) self.textEdit = QtGui.QTextEdit(self) self.layoutVertical = QtGui.QVBoxLayout(self) self.layoutVertical.addWidget(self.textEdit) if __name__ == "__main__": app = QtGui.QApplication(sys.argv) app.setApplicationName('MyWindow') main = MyWindow() main.show() sys.exit(app.exec_())

The way the program works is that you have some text inside the main window and then you insert an image. Then you click "Copy and paste to Child Window" button and it should paste all the contents to the child, including the image - but that doesn't work that way it's supposed to - the text is copied but I get a little file icon where the image should be.

I would appreciate your help on this.

Paul

score 1 · Answer 1 · Mar 24 at 0:06

up vote 1 down vote

QTextEdit doesn't decode image MIME types by default, so just subclass it to add support, you'll need to reimplement canInsertFromMimeData and insertFromMimeData, also try QTextBrowserinstead. Just add this to your script:

class MyTextBrowser(QtGui.QTextBrowser): def __init__(self, parent=None): super(MyTextBrowser, self).__init__(parent) self.setReadOnly(False) def canInsertFromMimeData(self, source): if source.hasImage(): return True else: return super(MyTextBrowser, self).canInsertFromMimeData(source) def insertFromMimeData(self, source): if source.hasImage(): image = QtCore.QVariant(source.imageData()) document = self.document() document.addResource( QtGui.QTextDocument.ImageResource, QtCore.QUrl("image"), image ) cursor = self.textCursor() cursor.insertImage("image") super(MyTextBrowser, self).insertFromMimeData(source)

And change self.textEdit = QtGui.QTextEdit(self) into self.textEdit = MyTextBrowser(self) on both widgets.

edited Mar 24 at 0:06

answered Mar 24 at 0:00

X.Jacobs
3,314 1 10 32

This is strange. For some reason source.hasImage() doesn't return True. Even when I try a .jpg or .png file. – Paul Mar 24 at 0:54

this is what I tried: print "has image?", data.hasImage(). I get False. – Paul Mar 24 at 0:56

1

That's because an html MIME type is being used, it is kind like if you where saying mimedata = textEdit.toHtml() and textEdit.setHtml(mimedata) – X.Jacobs Mar 24 at 1:15

Sorry but how can I implement the behavior of copying text AND images inside QTextEdit field using QMimeData? I am still a newb so I don't fully quite understand the documentation. – Paul Mar 24 at 2:13

1

That's exactly what you are doing, using an html MIME type. If you want to use a different MIME type you'll have to implement it yourself, possibly iterating over the elements on your document and checking their types. Note that QMimeData is usually used to supply data to the QDrag or QClipboard objects, using the toHtml method would be much more convenient in your case. – X.Jacobs Mar 24 at 12:39

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score 11 · Accepted Answer · Sep 15 '10 at 18:28

think this is a very simple question, but when I copy an image I can't paste it in a QTextEdit? Paste is inactive! Also I would like to know how to drag-and-drop a picture.

BTW I use the following code in order to insert a picture into a QTextEdit:

QTextEdit *textEditor = new QTextEdit(0); QTextDocumentFragment fragment; fragment = QTextDocumentFragment::fromHtml("<img src='C:\\aaa.jpg'>"); textEditor->textCursor().insertFragment(fragment); textEditor->setVisible(true);

Is it recommended? How do you do this operation?

edited Sep 15 '10 at 18:28

asked Jul 15 '10 at 10:24

Narek
5,923 13 75 151

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1 Answer

active oldest votes

up vote 11 down vote accepted

The second way is this:

void TextEdit::insertImage() { QString file = QFileDialog::getOpenFileName(this, tr("Select an image"), ".", tr("Bitmap Files (*.bmp)\n" "JPEG (*.jpg *jpeg)\n" "GIF (*.gif)\n" "PNG (*.png)\n")); QUrl Uri ( QString ( "file://%1" ).arg ( file ) ); QImage image = QImageReader ( file ).read(); QTextDocument * textDocument = m_textEdit->document(); textDocument->addResource( QTextDocument::ImageResource, Uri, QVariant ( image ) ); QTextCursor cursor = m_textEdit->textCursor(); QTextImageFormat imageFormat; imageFormat.setWidth( image.width() ); imageFormat.setHeight( image.height() ); imageFormat.setName( Uri.toString() ); cursor.insertImage(imageFormat); }

The third way is to inherit QTextEdit and reimplement bool canInsertFromMimeData(const QMimeDatasource) const* and void insertFromMimeData(const QMimeData source)* functions as followes. Buy the way this method allows to use drag-and-drop or copy-paste mechanisms.

class TextEdit : public QTextEdit { public: bool canInsertFromMimeData(const QMimeData* source) const { return source->hasImage() || source->hasUrls() || QTextEdit::canInsertFromMimeData(source); } void insertFromMimeData(const QMimeData* source) { if (source->hasImage()) { static int i = 1; QUrl url(QString("dropped_image_%1").arg(i++)); dropImage(url, qvariant_cast<QImage>(source->imageData())); } else if (source->hasUrls()) { foreach (QUrl url, source->urls()) { QFileInfo info(url.toLocalFile()); if (QImageReader::supportedImageFormats().contains(info.suffix().toLower().toLatin1())) dropImage(url, QImage(info.filePath())); else dropTextFile(url); } } else { QTextEdit::insertFromMimeData(source); } } private: void dropImage(const QUrl& url, const QImage& image) { if (!image.isNull()) { document()->addResource(QTextDocument::ImageResource, url, image); textCursor().insertImage(url.toString()); } } void dropTextFile(const QUrl& url) { QFile file(url.toLocalFile()); if (file.open(QIODevice::ReadOnly | QIODevice::Text)) textCursor().insertText(file.readAll()); } };

score 11 · Accepted Answer

The second way is this:

void TextEdit::insertImage() { QString file = QFileDialog::getOpenFileName(this, tr("Select an image"), ".", tr("Bitmap Files (*.bmp)\n" "JPEG (*.jpg *jpeg)\n" "GIF (*.gif)\n" "PNG (*.png)\n")); QUrl Uri ( QString ( "file://%1" ).arg ( file ) ); QImage image = QImageReader ( file ).read(); QTextDocument * textDocument = m_textEdit->document(); textDocument->addResource( QTextDocument::ImageResource, Uri, QVariant ( image ) ); QTextCursor cursor = m_textEdit->textCursor(); QTextImageFormat imageFormat; imageFormat.setWidth( image.width() ); imageFormat.setHeight( image.height() ); imageFormat.setName( Uri.toString() ); cursor.insertImage(imageFormat); }

The third way is to inherit QTextEdit and reimplement bool canInsertFromMimeData(const QMimeDatasource) const* and void insertFromMimeData(const QMimeData source)* functions as followes. Buy the way this method allows to use drag-and-drop or copy-paste mechanisms.

class TextEdit : public QTextEdit { public: bool canInsertFromMimeData(const QMimeData* source) const { return source->hasImage() || source->hasUrls() || QTextEdit::canInsertFromMimeData(source); } void insertFromMimeData(const QMimeData* source) { if (source->hasImage()) { static int i = 1; QUrl url(QString("dropped_image_%1").arg(i++)); dropImage(url, qvariant_cast<QImage>(source->imageData())); } else if (source->hasUrls()) { foreach (QUrl url, source->urls()) { QFileInfo info(url.toLocalFile()); if (QImageReader::supportedImageFormats().contains(info.suffix().toLower().toLatin1())) dropImage(url, QImage(info.filePath())); else dropTextFile(url); } } else { QTextEdit::insertFromMimeData(source); } } private: void dropImage(const QUrl& url, const QImage& image) { if (!image.isNull()) { document()->addResource(QTextDocument::ImageResource, url, image); textCursor().insertImage(url.toString()); } } void dropTextFile(const QUrl& url) { QFile file(url.toLocalFile()); if (file.open(QIODevice::ReadOnly | QIODevice::Text)) textCursor().insertText(file.readAll()); } };

Answer 4

我想做一个小的聊天应用。界面大致如下：

History List是只读的，请问如何将Input中的内容加入到History List中去，
Input中的内容包括文字和图片。谢谢。

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回复次数：7

heksn heksn 等级：	#1 得分：20 回复于： 2012-11-29 22:17:31 看看Qt的例子： Text Object Example
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lilingshui lilingshui 等级：	#2 得分：0 回复于： 2012-11-30 09:02:03 引用 1 楼 heksn 的回复: 看看Qt的例子： Text Object Example 这个例子看了一下，它是告诉怎么在QTextEdit中插入图片，这个我会了，现在问题是，如何将Input中的内容加到History List中去，如果是纯文本那好办，主要是Input中会有图片。
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Jonix Jonix 等级：	#3 得分：10 回复于： 2012-11-30 13:26:47 QTextEdit 能插入图片吗？？？没试过，但我觉得放图片的话，你应该改用 QPlainTextEdit 吧
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: lilingshui; lilingshui; 等级：

#4 得分：0 回复于： 2012-11-30 17:01:57

引用 3 楼 Jonix 的回复:

QTextEdit 能插入图片吗？？？

没试过，但我觉得放图片的话，你应该改用 QPlainTextEdit 吧

QTextEdit可以插图片啊，如下

C/C++ code 
           
?
 
                void  
                MainWindow::OnInsertPicture() 
               
                { 
               
                QString file = QFileDialog::getOpenFileName( 
                this 
                , tr( 
                "Select an image" 
                ), 
               
                "." 
                , tr( 
                "Images (*.png *.gif *.jpg *jpeg)" 
                )); 
               
                QUrl Uri ( QString (  
                "file://%1"  
                ).arg ( file ) ); 
               
                QImage image = QImageReader ( file ).read(); 
               
                QTextDocument * textDocument = m_pInputEdit->document(); 
               
                textDocument->addResource( QTextDocument::ImageResource, Uri, QVariant ( image ) ); 
               
                QTextCursor cursor = m_pInputEdit->textCursor(); 
               
                QTextImageFormat imageFormat; 
               
                imageFormat.setWidth( image.width() ); 
               
                imageFormat.setHeight( image.height() ); 
               
                QString string = Uri.toString() ; 
               
                imageFormat.setName(string); 
               
                cursor.insertImage(imageFormat);  
               
                }

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: lilingshui; lilingshui; 等级：

#6 得分：0 回复于： 2012-12-05 12:18:25

找到了一个方法，但还没解决GIF图片动态显示的问题：
插入图片的代码：

C/C++ code 
           
?
 
                void  
                MainWindow::onInsertPicture() 
               
                { 
               
                QString file = QFileDialog::getOpenFileName( 
                this 
                , tr( 
                "Select an image" 
                ), 
               
                "." 
                , tr( 
                "Images (*.png *.gif *.jpg *jpeg)" 
                )); 
               
                if  
                (file.isEmpty()) 
               
                { 
               
                return 
                ; 
               
                } 
               
                QTextImageFormat imageFormat; 
               
                imageFormat.setName(file); 
               
                QTextCursor cursor = m_pInputEdit->textCursor(); 
               
                cursor.insertImage(imageFormat); 
               
                }

将input的内容添加到history中的代码：

C/C++ code 
           
?
 
                void  
                MainWindow::onSend() 
               
                {      
               
                QString strInputContent =  m_pInputEdit->toHtml(); 
               
                m_pMsgListor->append(strInputContent); 
               
                m_pInputEdit->clear(); 
               
                }

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#7 得分：0 回复于： 2013-04-17 14:58:31

楼主，你的方法很简单，不过gif图片的办法找到了吗？希望指点一下

qt 图文混排

2 Answers

1 Answer

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