Qt Slot Not Being Called
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I cannot for the life of me figure out how to use signals and slots to pass information to the GUI widget in an RQT plugin that is written in C++. The ROS Tutorial for creating a C++ RQT plugin doesn’t even have any data widgets in the GUI, let alone any code to show how to use signals/slots to pipe data to a data widget: http://wiki.ros.org/rqt/Tutorials/Wri...
*Ok shall retain the existing disconnect statements used in Qt 4.8.x and call deleteLater instead. Remove Slot In Qt File; Remove Slot In Qtc; This page describes the use of signals and slots in Qt for Python.The emphasis is on illustrating the use of so-called new-style signals and slots, although the traditional syntax is also given as a.
*Connecting in Qt 5. There are several ways to connect a signal in Qt 5. Qt 5 continues to support the old string-based syntax for connecting signals and slots defined in a QObject or any class that inherits from QObject (including QWidget). Connect( sender, SIGNAL( valueChanged( QString, QString ) ), receiver, SLOT( updateValue( QString ) ) ).
All of the recommended casinos here are legitimate sites that keep players safe. They respect gambling rules and age Qt Slot Not Being Called restrictions, offering an excellent real money gaming experience in a secure environment dedicated to players’ welfare and security online. This method is also a Qt slot with the C signature void currentChanged(const QModelIndex&,const QModelIndex&). This slot is called when a new item becomes the current item. The previous current item is specified by the previous index, and the new item by the current index. If you want to know about changes to items see the dataChanged signal.
After several hours of trial and error, I was able to figure out a solution for using signals/slots in a Python RQT plugin, but I can’t seem to make the stretch to C++.
Here is the python example I created starting from the ROS Tutorial for creating a python RQT plugin ( https://github.com/lucasw/rqt_mypkg ) and then adding some of this code from ROS Answers where a user asked how to use signals/slots in python: http://answers.ros.org/question/22415...
my_module.py:(more)editretagflag offensiveclosemergedelete
*Status:Closed
*Resolution: Duplicate
*Fix Version/s: None
*Labels:
*Environment:
I’m experiencing an issue with Qt 5.11.0 on on MacOS 10.13 where widgets are not redrawing after setText() is called. This problem did not exist in Qt 5.10.0, so it seems to have been introduced in 5.11.0. The problem occurs only on MacOS, and does not occur on Windows 8.1 or Linux Mint Cinnamon.
Example Program To Illustrate Problem
Here is a short program to demonstrate the issue:
testdlg.h
main.cpp
Clicking the ’Abort’ button causes the abort() function to be called, which changes the text on the two QLables and the QPushButton. However, on MacOS only the label1 text changes, and the label2 text and button text remain unchanged. This can be seen on the attached screenshot.
If you cover the dialog box with another window, then uncover it, the window will redraw with both QLables and the QPushButton all updated to the text set in abort(). It therefore seems that the text is being set but the widgets are not being redrawn until a redraw is triggered by covering and uncovering the window.
Running the same program on Windows or Linux with Qt 5.11.0 the problem does not occur and all three widgets update immediately upon pressing the ’Abort’ button. Testing the program on MacOS with Qt 5.10.0 the three widgets again update immediately when the ’Abort’ button is pressed. The issue is therefore exclusive to Qt 5.11.0 on MacOS.
Other Redraw Issues
At the bottom of the screenshot I have shown another redraw issue. In that example I commented out the three lines involving label1, ran the program and clicked the ’Abort’ button. As you can see, label2 has updated but parts of the original text still remain. It therefore appears that there are other general redraw issues in Qt 5.11.0 on MacOS that weren’t present in Qt 5.10.0.AttachmentsQt Slot Not Being Called At Aduplicates
QTBUG-68067QPushButton’s state (disabled) is not updated correctlyQt Slot Not Called Thread
*Reported
QTBUG-68740QTextEdit missing repaint after clear signal
*ClosedGerrit Reviews No reviews matched the request. Check your Options in the drop-down menu of this sections header. Qt Slot Not Getting CalledAssignee: Qt Quick and Widgets Team Reporter: Richard Craig Votes:1Vote for this issueWatchers:4Start watching this issue
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I cannot for the life of me figure out how to use signals and slots to pass information to the GUI widget in an RQT plugin that is written in C++. The ROS Tutorial for creating a C++ RQT plugin doesn’t even have any data widgets in the GUI, let alone any code to show how to use signals/slots to pipe data to a data widget: http://wiki.ros.org/rqt/Tutorials/Wri...
*Ok shall retain the existing disconnect statements used in Qt 4.8.x and call deleteLater instead. Remove Slot In Qt File; Remove Slot In Qtc; This page describes the use of signals and slots in Qt for Python.The emphasis is on illustrating the use of so-called new-style signals and slots, although the traditional syntax is also given as a.
*Connecting in Qt 5. There are several ways to connect a signal in Qt 5. Qt 5 continues to support the old string-based syntax for connecting signals and slots defined in a QObject or any class that inherits from QObject (including QWidget). Connect( sender, SIGNAL( valueChanged( QString, QString ) ), receiver, SLOT( updateValue( QString ) ) ).
All of the recommended casinos here are legitimate sites that keep players safe. They respect gambling rules and age Qt Slot Not Being Called restrictions, offering an excellent real money gaming experience in a secure environment dedicated to players’ welfare and security online. This method is also a Qt slot with the C signature void currentChanged(const QModelIndex&,const QModelIndex&). This slot is called when a new item becomes the current item. The previous current item is specified by the previous index, and the new item by the current index. If you want to know about changes to items see the dataChanged signal.
After several hours of trial and error, I was able to figure out a solution for using signals/slots in a Python RQT plugin, but I can’t seem to make the stretch to C++.
Here is the python example I created starting from the ROS Tutorial for creating a python RQT plugin ( https://github.com/lucasw/rqt_mypkg ) and then adding some of this code from ROS Answers where a user asked how to use signals/slots in python: http://answers.ros.org/question/22415...
my_module.py:(more)editretagflag offensiveclosemergedelete
*Status:Closed
*Resolution: Duplicate
*Fix Version/s: None
*Labels:
*Environment:
I’m experiencing an issue with Qt 5.11.0 on on MacOS 10.13 where widgets are not redrawing after setText() is called. This problem did not exist in Qt 5.10.0, so it seems to have been introduced in 5.11.0. The problem occurs only on MacOS, and does not occur on Windows 8.1 or Linux Mint Cinnamon.
Example Program To Illustrate Problem
Here is a short program to demonstrate the issue:
testdlg.h
main.cpp
Clicking the ’Abort’ button causes the abort() function to be called, which changes the text on the two QLables and the QPushButton. However, on MacOS only the label1 text changes, and the label2 text and button text remain unchanged. This can be seen on the attached screenshot.
If you cover the dialog box with another window, then uncover it, the window will redraw with both QLables and the QPushButton all updated to the text set in abort(). It therefore seems that the text is being set but the widgets are not being redrawn until a redraw is triggered by covering and uncovering the window.
Running the same program on Windows or Linux with Qt 5.11.0 the problem does not occur and all three widgets update immediately upon pressing the ’Abort’ button. Testing the program on MacOS with Qt 5.10.0 the three widgets again update immediately when the ’Abort’ button is pressed. The issue is therefore exclusive to Qt 5.11.0 on MacOS.
Other Redraw Issues
At the bottom of the screenshot I have shown another redraw issue. In that example I commented out the three lines involving label1, ran the program and clicked the ’Abort’ button. As you can see, label2 has updated but parts of the original text still remain. It therefore appears that there are other general redraw issues in Qt 5.11.0 on MacOS that weren’t present in Qt 5.10.0.AttachmentsQt Slot Not Being Called At Aduplicates
QTBUG-68067QPushButton’s state (disabled) is not updated correctlyQt Slot Not Called Thread
*Reported
QTBUG-68740QTextEdit missing repaint after clear signal
*ClosedGerrit Reviews No reviews matched the request. Check your Options in the drop-down menu of this sections header. Qt Slot Not Getting CalledAssignee: Qt Quick and Widgets Team Reporter: Richard Craig Votes:1Vote for this issueWatchers:4Start watching this issue
Register here: http://gg.gg/owtie
https://diarynote.indered.space
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