• 1 Question : I registered the movement of the dialogue and in the style I registered the border (its color and width); how can I make it so that I can move only the upper strip and I click on the area of ​​this strip, my mouse did not jump, but was in the place where I clamped it? And I also have a problem, when dragging a window (depending on which way) my borders disappear, how can I fix it?
  • 2 Question : I need a window (not a dialogue) in which I can create an area in which I can draw or insert a picture. Also, how to make it so that when I bring this window into the main area of ​​the program they are connected (something like AdobePhotoshop)
  • 3 Question : How to check whether information is entered into a line or not, and if not, the button is not activated (I tried searching, but it doesn’t work for me, or I didn’t write well) and also how to prevent characters and numbers from entering and of course, how to put a limit on the number of letters that can be entered?

PS The code concerns only the dialogue!

PS2. How to make a paragraph here?

PS3. Novice programmer!

Header file:

namespace Ui { class newF; } class newF : public QDialog { Q_OBJECT Q_PROPERTY(QPoint previousPosition READ previousPosition WRITE setPreviousPosition NOTIFY previousPositionChanged) public: explicit newF(QWidget *parent = 0); ~newF(); QPoint previousPosition() const; private: Ui::newF *ui; QPushButton *ok; QLineEdit *name; QPushButton *cls; QPoint m_previousPosition; protected: void paintEvent(QPaintEvent *event); void mouseMoveEvent(QMouseEvent *event); public slots: void setPreviousPosition(QPoint previousPosition); signals: void previousPositionChanged(QPoint previousPosition); private slots: void cancel(){ close(); } void exit(){ close(); } void Ok(); void TextChanged(const QString text){ if(!name->text().isEmpty()) ok->setEnabled (true); } };

Implementation file:

 newF::newF(QWidget *parent) : QDialog(parent), ui(new Ui::newF) { ui->setupUi(this); this->setModal(true); this->setWindowFlags(Qt::FramelessWindowHint); this->setStyleSheet(StyleHelper::getQDialogStyleSheet()); QPushButton *close = new QPushButton (this); close->setGeometry(189, 1, 40, 18); close->setStyleSheet("QPushButton {" "image: url(:/images/close.png);" "background-color: #000000;" "border: none;" "}" "QPushButton:hover {" "background-color: red; " "}"); connect(close,SIGNAL(clicked()),this,SLOT(exit())); QLabel *newf = new QLabel("Name:",this); newf->setStyleSheet("QLabel {" "background-color: #363636;" "color: #000000;" "}"); name = new QLineEdit(this); name->text(); name->setStyleSheet("QLineEdit {" "color: #FFFFFF;" "border: 1px double black const;" "};"); newf->setBuddy(name); connect(name, SIGNAL(textChanged(const QString &text)), this, SLOT(TextChanged(const QString &text))); ok = new QPushButton("OK",this); ok->setStyleSheet("QPushButton {" "background-color: #696969;" "border: none;" "}"); ok->setDefault(true); ok->setEnabled(false); connect(ok,&QPushButton::clicked,this,&newF::Ok); QPushButton *cancel = new QPushButton("Cancel",this); cancel->setStyleSheet("QPushButton {" "background-color: #696969;" "border: none;" "}" "QPushButton:hover {" "background-color: #7D7D7D;" "}"); cancel->setGeometry(0, 0, 20, 50); connect(cancel,SIGNAL(clicked()),this,SLOT(cancel())); QHBoxLayout *hb1 = new QHBoxLayout; hb1->addWidget(newf); hb1->addWidget(name); QHBoxLayout *hb = new QHBoxLayout; hb->addWidget(ok); hb->addWidget(cancel); QVBoxLayout *vb = new QVBoxLayout; vb->addLayout(hb1); vb->addLayout(hb); setLayout(vb); } newF::~newF() { delete ui; } void newF::Ok(){ MainArea *mainarea = new MainArea(); mainarea->show(); } void newF::paintEvent(QPaintEvent *event){ Q_UNUSED(event); QPainter painter(this); painter.setPen(QPen(Qt::black, 40, Qt::SolidLine, Qt::FlatCap)); painter.drawLine(0, 0, 230, 0); } QPoint newF::previousPosition() const { return m_previousPosition; } void newF::setPreviousPosition(QPoint previousPosition) { if (m_previousPosition == previousPosition) return; m_previousPosition = previousPosition; emit previousPositionChanged(previousPosition); } void newF::mouseMoveEvent(QMouseEvent *event) { auto dx = event->x() - m_previousPosition.x(); auto dy = event->y() - m_previousPosition.y(); setGeometry(x() + dx, y() + dy, width(), height()); return QWidget::mouseMoveEvent(event); }

PS4. And I would like to know how normal the article is to fill in, so that the code would not look so awful (sorry!)

    2 answers 2

    The answer to your third question. To make the button inaccessible when there is no text I do this:

     void MainWindow::on_lineEdit_textChanged(const QString &arg1) { QString s1; s1 = ui->lineEdit->text(); if(s1!="") ui->pushButton->setEnabled(true); else ui->pushButton->setEnabled(false); }

    And in order to limit the number of characters or allow input of only certain characters, use inputmask. Here is a link to a good example: http://doc.crossplatform.ru/qt/4.7.x/widgets-lineedits.html

    • void newF::TextChanged(const QString &arg1) @ Anatoly "arg1" - I write that he is not active, is this correct? - notnames
    • And see if the connection is correct (maybe there is an error in it) connect(name, SIGNAL(textChanged(const QString &)), this, SLOT(TextChanged(const QString &arg1))); - notnames
    • And really, I'm sorry, but I can't fully understand the mask, can you somehow poke my sock even deeper? - notnames
    • The connection should look like this: connect (ui-> lineEdit, SIGNAL (textChanged (QString)), this, SLOT (myfunction)); Where in myfunction you can write the code that I wrote earlier - Anatoly
    • In general, in order not to bother with a connection, just in QtCreator in designer mode, click on the component to enter text and there will be an item to go to the slot, and select TextChange and you will immediately have a slot in which to write the code I gave above tomorrow I will try to find an example for you with masks (PS: I want to sleep now) - Anatoly

    Regarding the second question, look towards QDockWidget ( example )