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  4. How to override functionality for widgets hiding when losing mouse focus?
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How to override functionality for widgets hiding when losing mouse focus?

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  • Q Offline
    Q Offline
    Qtstarter121
    wrote on last edited by Qtstarter121
    #1

    I need some kind of way to replace the existing functionality where a widget will hide automatically when a click occurs outside of it ( loses focus) with my own code to do something else instead.

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    • ? Offline
      ? Offline
      A Former User
      wrote on last edited by
      #2

      Hi, and welcome to the Qt forum.

      widget will hide automatically when [...] loses focus [...]

      You can override QWidget::focusOutEvent(QFocusEvent *event), see: focusOutEvent().

      class MyPlainTextEdit : public QPlainTextEdit
      {
          Q_OBJECT
      public:
          explicit MyPlainTextEdit(QWidget *parent = nullptr);
      protected:
          virtual void focusOutEvent(QFocusEvent *) override { hide(); }
      };
      
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      • Q Offline
        Q Offline
        Qtstarter121
        wrote on last edited by
        #3

        Thank you. The problem is that I need to implement this in the eventFilter of my QMainWindow to filter for the correct object. I cannot implement this function for the object I need since there's no class implementation for that object, it's all part of my QMainWindow. How would I do this?

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        • ? Offline
          ? Offline
          A Former User
          wrote on last edited by A Former User
          #4

          Let's assume you have your MainWindow class and it contains the widget plainTextEdit.

          myeventfilter.h

          #ifndef MYEVENTFILTER_H
          #define MYEVENTFILTER_H
          
          #include <QObject>
          
          class MyEventFilter : public QObject
          {
              Q_OBJECT
          public:
              MyEventFilter(QObject *parent = nullptr);
          protected:
              virtual bool eventFilter(QObject *watched, QEvent *event) override;
          };
          
          #endif // MYEVENTFILTER_H
          

          myeventfilter.cpp

          #include "myeventfilter.h"
          #include <QEvent>
          #include <QWidget>
          
          MyEventFilter::MyEventFilter(QObject *parent)
              : QObject(parent)
          {
          }
          
          bool MyEventFilter::eventFilter(QObject *watched, QEvent *event)
          {
              if (event->type() == QEvent::FocusOut) {
                  auto widget = dynamic_cast<QWidget *>(watched);
                  widget->hide();
                  return true;
              } else {
                  return QObject::eventFilter(watched, event);
              }
          }
          

          mainwindow.cpp

          #include "mainwindow.h"
          #include "ui_mainwindow.h"
          #include "myeventfilter.h"
          
          MainWindow::MainWindow(QWidget *parent)
              : QMainWindow(parent)
              , ui(new Ui::MainWindow)
          {
              ui->setupUi(this);
              auto myEventFilter = new MyEventFilter(this);
              ui->plainTextEdit->installEventFilter(myEventFilter);
          }
          
          // ...
          
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          • Vinod KuntojiV Offline
            Vinod KuntojiV Offline
            Vinod Kuntoji
            wrote on last edited by
            #5

            @Qtstarter121 ,

            Hi,

            You can use,
            yourWidget->setWindowFlags(Qt::Popup);
            this will hide your widget when you click outside of it.

            C++, Qt, Qt Quick Developer,
            PthinkS, Bangalore

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