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This article is about how to use QLabel in Qt. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Main member functions:

1.void setText (QString); / / sets the text in the label box.

2.void hide (); / / hides the label box.

3.void setBuddy (QWidget*); / / set another part as the partner of the label box for quick and convenient use.

4.void clear (); / / clear all the contents of the label box.

5.void setPixmap (QPixmap (QString)); / / set the picture.

6.void setMovie (QMovie*); / / set up the movie.

7.void setScaledContents (bool); / / sets whether to fill the entire label box proportionally (very important)

8.void setToolTip (QString); / / sets the message that holding the mouse over the label box will automatically pop up the text.

9.void setToolTipDuration (int); / / sets the duration of the message prompt in milliseconds.

10.void setAlignment (Qt::Alignment); / / sets the alignment format of the label box.

11.void setStyleSheet (QString); / / sets the style of the label box.

Based on the use of QLabel above, here is an example of program code for QLabel:

Here is what happens after the program runs:

First, do the layout through the Qt designer:

The following is the "Code within c.cpp:" the code contains comments for easy understanding.

# include "c.h" parent QMainWindow (parent) {/ / apply Qt designer ui.setupUi (this); / / modify the title. This- > setWindowTitle (QString::fromLocal8Bit ("QLabel program example:")); / / fill QStringList with pictures. InitPictureList (); / / apply for a space for the QMovie object. Movie = new QMovie; / / sets the new text for two QLabel objects. Ui.movieLabel- > setText (QString::fromLocal8Bit ("no movie"); ui.pictureLabel- > setText (QString::fromLocal8Bit ("no picture")); / / set the contents of the two label boxes in the middle. Ui.movieLabel- > setAlignment (Qt::AlignCenter | Qt::AlignHCenter); ui.pictureLabel- > setAlignment (Qt::AlignCenter | Qt::AlignHCenter); / / cannot be clicked on the previous button at the beginning, because there is no previous one. Ui.previousPictureButton- > setEnabled (false); / / set the prompt box for movieLabel so that a text prompt appears when the mouse is over label. Ui.movieLabel- > setToolTip (QString::fromLocal8Bit); / / set the duration of the text prompt to 5000 milliseconds, that is, it automatically disappears after 5 seconds. Ui.movieLabel- > setToolTipDuration (1000); / / set two label boxes to fill automatically. Ui.movieLabel- > setScaledContents (true); ui.pictureLabel- > setScaledContents (true); / / set printLineEdit as the partner of printLabel, so that you press alt+R to place the cursor in the line edit box. Note: set the label name & R. ui.printLabel- > setBuddy (ui.printLineEdit); / / connect the signal and slot. Connect (ui.startButton, SIGNAL (clicked ()), this, SLOT (startMovieLabelSlot ()); connect (ui.continueButton, SIGNAL (clicked ()), this, SLOT (continueMovieLabelSlot (); connect (ui.previousPictureButton, SIGNAL (clicked ()), this, SLOT (showPreviousPictureSlot ()); connect (ui.nextPictureButton, SIGNAL (clicked ()), this, SLOT (showNextPictureSlot () Click on the slot function of the start button. Void c::startMovieLabelSlot () {/ / sets the path of the movie to be played. Note that you need to put the gif file under the corresponding exe program. Movie- > setFileName ("Movie/0.gif"); / / movieLabel application movie. Ui.movieLabel- > setMovie (movie); / / start playing movie- > start ();} / / Click the slot function of the pause / resume button. Void c::continueMovieLabelSlot () {/ / determine the status of the current movie. If (movie- > state () = = QMovie::Running) {movie- > setPaused (true); ui.continueButton- > setText (QString::fromLocal8Bit ("continue");} else if (movie- > state () = = QMovie::Paused) {movie- > setPaused (false); ui.continueButton- > setText (QString::fromLocal8Bit ("pause")) }} void c::initPictureList () {/ / put the paths of all photos into QStringList. For (int I = 0; I

< 10; ++i) { QString path = "Pixmap/" + QString::number(i) + ".jpg"; pictureList.push_back(path); }}//点击上一张按钮的槽函数.void c::showPreviousPictureSlot(){ --pictureNumber; ui.pictureLabel->

SetPixmap (QPixmap (pictureList [pictureNumber]); if (pictureNumber = = 0) {ui.previousPictureButton- > setEnabled (false);} ui.nextPictureButton- > setEnabled (true);} / / Click the slot function of the next button. Void c::showNextPictureSlot () {if (ui.pictureLabel- > pixmap ()! = 0) + pictureNumber; ui.pictureLabel- > setPixmap (QPixmap (pictureList [pictureNumber]) If (pictureNumber = = 9) {ui.nextPictureButton- > setEnabled (false);} if (pictureNumber! = 0) ui.previousPictureButton- > setEnabled (true)

The following is the code in "c.h":

# ifndef C_H#define C_H#include # include "ui_c.h" # include # include class c: public QMainWindow {Q_OBJECTpublic: C (QWidget * parent = 0); ~ c (); private slots: void startMovieLabelSlot (); void continueMovieLabelSlot (); void showPreviousPictureSlot (); void showNextPictureSlot (); private: void initPictureList (); Ui::cClass ui; QMovie * movie; QStringList pictureList; int pictureNumber = 0;} # endif / / C_H1234567891011121314151617181920212223242526272829303132333435

Finally, there is "Code within main.cpp:"

# include "c.h" # include int main (int argc, char * argv []) {QApplication a (argc, argv); c w; w.show (); return a.exec ();} 1234567891011 Thank you for reading! This is the end of the article on "how to use QLabel in Qt". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!

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