Qlabel example

The QLabel widget provides a text or image display. QLabel is used for displaying text or an image. No user interaction functionality is provided. The visual appearance of the label can be configured in various ways, and it can be used for specifying a focus mnemonic key for another widget. Warning: When passing a QString to the constructor or calling setTextmake sure to sanitize your input, as QLabel tries to guess whether it displays the text as plain text or as rich text.

C++ Qt 14 - QLabel and QT Designer

You may want to call setTextFormat explicitly, e. By default, labels display left-aligned, vertically-centered text and images, where any tabs in the text to be displayed are automatically expanded. However, the look of a QLabel can be adjusted and fine-tuned in several ways. The positioning of the content within the QLabel widget area can be tuned with setAlignment and setIndent. Text content can also wrap lines along word boundaries with setWordWrap. For example, this code sets up a sunken panel with a two-line text in the bottom right corner both lines being flush with the right side of the label :.

The properties and functions QLabel inherits from QFrame can also be used to specify the widget frame to be used for any given label. A QLabel is often used as a label for an interactive widget. For this use QLabel provides a useful mechanism for adding an mnemonic see QKeySequence that will set the keyboard focus to the other widget called the QLabel 's "buddy". For example:. If the buddy was a button inheriting from QAbstractButtontriggering the mnemonic would emulate a button click.

If a label displays text, the indent applies to the left edge if alignment is Qt::AlignLeftto the right edge if alignment is Qt::AlignRightto the top edge if alignment is Qt::AlignTopand to to the bottom edge if alignment is Qt::AlignBottom.

If indent is negative, or if no indent has been set, the label computes the effective indent as follows: If frameWidth is 0, the effective indent becomes 0. If frameWidth is greater than 0, the effective indent becomes half the width of the "x" character of the widget's current font. By default, the indent is -1, meaning that an effective indent is calculating in the manner described above. See also alignmentmarginframeWidthand font. The margin is the distance between the innermost pixel of the frame and the outermost pixel of contents.

If no text has been set this will return an empty string. Setting the text clears any previous content. The text will be interpreted either as plain text or as rich text, depending on the text format setting; see setTextFormat.

The default setting is Qt::AutoText ; i. QLabel will try to auto-detect the format of the text set. Note that QLabel is well-suited to display small rich text documents, such as small documents that get their document specific settings font, text color, link color from the label's palette and font properties.

For large documents, use QTextEdit in read-only mode instead. QTextEdit can also provide a scroll bar when necessary. See also setTextFormatsetBuddyand alignment. See the Qt::TextFormat enum for an explanation of the possible options. If this property is true then label text is wrapped where necessary at word-breaks; otherwise it is not wrapped at all. The parent and widget flag farguments are passed to the QFrame constructor.Here are the examples of the python api PyQt5.

QLabel taken from open source projects. By voting up you can indicate which examples are most useful and appropriate. QLabel By T Tak. Example 1 Project: calibre Source File: config. Example 2 Project: calibre Source File: config. Example 13 Project: calibre Source File: exim. Example 15 Project: calibre Source File: progress. Example 16 Project: calibre Source File: scheduler. Example 17 Project: calibre Source File: scheduler. Example 19 Project: calibre Source File: init.

Example 20 Project: calibre Source File: exim. Example 22 Project: calibre Source File: progress. Example 23 Project: calibre Source File: scheduler. Example 24 Project: calibre Source File: scheduler. Example 29 Project: calibre Source File: main.

Example 31 Project: calibre Source File: download. Example 32 Project: calibre Source File: download. Example 33 Project: calibre Source File: download. Example 34 Project: calibre Source File: snippets. Example 37 Project: calibre Source File: main. Example 38 Project: calibre Source File: main. Example 47 Project: calibre Source File: polish.Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you may not be able to execute some actions.

Please download a browser that supports JavaScript, or enable it if it's disabled i. Hi, I'm using setPixmap method to draw images on a label, but met a problem. Originally, the label has its background set with a pixmap, let call it pixmap1, with setPixmap pixmap1.

Then I copy this pixmap and use it as the paint device to draw images on it. After painting is done, I then reset this label's pixmap with this modified copy, let's call it pixmap2, using its set method setPixmap pixmap2.

However, the pixmap on the label wouldn't change in any way. What's strange is that when I save this label's modified pixmap into a png file, everything is all right, and the saved pixmap is correctly modified as I paint images on it. VRonin Thank you! In my last post several days ago, according to your suggestion, I correctly set the pixmap of a label by avoiding subclassing QLabel.

But here, I met similar problem again! I couldn't reset QLabel's pixmap. Anyways, I will try your suggestion and let's see the result!

qlabel example

VRonin said in QLabel::setPixmap doesn't show image! David hi, maybe you haven't released your pixmap correctly when you're finished with the drawing? Hilk Thanks. Did you mean:. David said in QLabel::setPixmap doesn't show image! It's created as a member in the ScreenShot class:.

qlabel example

David ok to make sure, it works at all. Would this show the correct Image? Hilk This works correctly: A series of windows pops up with lines painted on the original pixmap. David Alright, we narrowed the problem down. It's with selectedImageLabel. My guess, if its a standard QLabel, the pixmap is somewhere else overwriten. Yes, it's the problem somewhere with selectedImageLabel. But I don't quite understand what you mean by saying overwritten. The saved pixmap of selectedImageLabel is all right.

It just doesn't update and show up on the label. David Out of the top of my head, I can only think of 3 reasons, why a QLabel wouldn't show a pixmap. The functionality of my code is:. In the above picture, the highlighted area is actually a label with selected image as its pixmap. So you can see the label is shown correctly.The QLabel widget provides a text or image display.

More …. QLabel is used for displaying text or an image. No user interaction functionality is provided. The visual appearance of the label can be configured in various ways, and it can be used for specifying a focus mnemonic key for another widget. A QLabel can contain any of the following content types:. Pass a QString to setText. Pass a QString that contains rich text to setText. Pass a QPixmap to setPixmap.

Pass a QMovie to setMovie.

PyQt - QLabel Widget

Pass an int or a double to setNumwhich converts the number to plain text. The same as an empty plain text. This is the default. Set by clear. When passing a QString to the constructor or calling setTextmake sure to sanitize your input, as QLabel tries to guess whether it displays the text as plain text or as rich text, a subset of HTML 4 markup.

You may want to call setTextFormat explicitly, e. By default, labels display left-aligned, vertically-centered text and images, where any tabs in the text to be displayed are automatically expanded. However, the look of a QLabel can be adjusted and fine-tuned in several ways. The positioning of the content within the QLabel widget area can be tuned with setAlignment and setIndent. Text content can also wrap lines along word boundaries with setWordWrap.

For example, this code sets up a sunken panel with a two-line text in the bottom right corner both lines being flush with the right side of the label :. The properties and functions QLabel inherits from QFrame can also be used to specify the widget frame to be used for any given label.

A QLabel is often used as a label for an interactive widget. For example:. If the buddy was a button inheriting from QAbstractButtontriggering the mnemonic would emulate a button click. The parent and widget flag farguments are passed to the QFrame constructor. Constructs a label that displays the text, text. This character is set as the shortcut key. To unset a previously set buddy, call this function with buddy set to nullptr.

Sets the label contents to movie. Any previous content is cleared. The label does NOT take ownership of the movie. Sets the label contents to plain text containing the textual representation of double num.

qlabel example

Sets the label contents to plain text containing the textual representation of integer num. Sets the label contents to picture. Selects text from position start and for length characters. Documentation contributions included herein are the copyrights of their respective owners. Qt and respective logos are trademarks of The Qt Company Ltd.In the next paragraph, click one of the languages, and you will see the display change accordingly.

This will give you the following result: translation. Admitted, this doesn't look too exciting. But click now again on one of the languages provided above. The text here changes, automatically, displaying you the translation in the selected language. This allows to easily create specific types of content. Take a look at the examples below, and especially at the source code of the simple example. A more detailed usage guide is available.

In our case, we annotate text that mentions something with that thing's unique identifier. This way, when a text mentions Viennawe know if the text is speaking about Vienna in Austria or Vienna in Virginia, and qLabel will know to display the first one as Wien in German and leave the second as Vienna.

Annotations can be useful well beyond of the service that qLabel offers, e. You can read more on annotation here. Instead the author of the website explicitly disambiguates what they mean, and qLabel looks up the name of that on the Web. Thus, qLabel is completely different than a service like Google Translate. The technical description offers more details. Click on Select language on the top left of the page, then select a language, and see the content of the page change The language selector widget is Wikimedia's awesome ULS.Layout management is the way how we place the widgets on the application window.

We can place our widgets using absolute positioning or with layout classes. Managing the layout with layout managers is the preferred way of organizing our widgets. The programmer specifies the position and the size of each widget in pixels.

When you use absolute positioning, we have to understand the following limitations:. We use the move method to position our widgets. In our case these are labels. We position them by providing the x and y coordinates. The beginning of the coordinate system is at the left top corner.

The x values grow from left to right. The y values grow from top to bottom. Imagine that we wanted to place two buttons in the right bottom corner. To create such a layout, we use one horizontal and one vertical box.

To create the necessary space, we add a stretch factor. The example places two buttons in the bottom-right corner of the window.

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They stay there when we resize the application window. We create a horizontal box layout and add a stretch factor and both buttons. The stretch adds a stretchable space before the two buttons. This will push them to the right of the window. The horizontal layout is placed into the vertical layout. The stretch factor in the vertical box will push the horizontal box with the buttons to the bottom of the window.

QGridLayout is the most universal layout class. It divides the space into rows and columns. The instance of a QGridLayout is created and set to be the layout for the application window. We create a window in which we have three labels, two line edits and one text edit widget.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. The Widget we should use to show pictures is a QLabel. Learn more. Asked 8 years, 8 months ago. Active 7 years ago.

Viewed 36k times. Active Oldest Votes. Try using a value instead.

PyQt - QPixmap Class

Shouldn't QObjects be created on the heap anyway? OrcunC When I update the image with another image, the previous image doesn't clear. Any idea how to clear the pixmap before setting new image? Dewsworld Im having the same issue It looks like the parent widget is not updating OK, heres the answer: stackoverflow.

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