Use a piece of code to detail the relevant signals emitted when QTableWidget’s cells are clicked (including single-click and double-click) and the content is edited. (1) Mainly include cellChanged, cellActivated, cellClicked, cellDoubleClicked, cellEntered, cellPressed and corresponding item class signals (2) Timing of sending each signal (3) The order in which signals are sent Through the […]
Tag: signals
The linux-5.4.18 kernel forces the output of graphics display signals and specifies the resolution through the firmware file.
Table of Contents 1 Introduction 2 Set the connector status to “connector_status_connected” 2.1 Connector status 2.2 Forcibly set the connector status to “connector_status_connected” 2.2.1 Introduction 2.2.2 Get the name of the connector 2.2.3 Add: video=DP-1:D to the startup parameters 3 Set the resolution through firmware 3.1 Create firmware file (take 1920×1200 resolution as an example) […]
QML(26)–Multi-layer qml interface transmits signals
Directory scenes to be used traditional way Efficient way code Show results Usage scenarios The interface nesting relationship is as follows #mermaid-svg-Pt8AQGPjE5lV7nJh {font-family:”trebuchet ms”,verdana,arial,sans-serif;font-size:16px;fill:#333;}#mermaid-svg-Pt8AQGPjE5lV7nJh .error- icon{fill:#552222;}#mermaid-svg-Pt8AQGPjE5lV7nJh .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-Pt8AQGPjE5lV7nJh .edge-thickness-normal{stroke-width:2px;} #mermaid-svg-Pt8AQGPjE5lV7nJh .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-Pt8AQGPjE5lV7nJh .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-Pt8AQGPjE5lV7nJh .edge- pattern-dashed{stroke-dasharray:3;}#mermaid-svg-Pt8AQGPjE5lV7nJh .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-Pt8AQGPjE5lV7nJh .marker{fill:#333333;stroke:#333333; }#mermaid-svg-Pt8AQGPjE5lV7nJh .marker.cross{stroke:#333333;}#mermaid-svg-Pt8AQGPjE5lV7nJh svg{font-family:”trebuchet ms”,verdana,arial,sans-serif;font-size:16px ;}#mermaid-svg-Pt8AQGPjE5lV7nJh .label{font-family:”trebuchet ms”,verdana,arial,sans-serif;color:#333;}#mermaid-svg-Pt8AQGPjE5lV7nJh .cluster-label text{fill: #333;}#mermaid-svg-Pt8AQGPjE5lV7nJh .cluster-label span{color:#333;}#mermaid-svg-Pt8AQGPjE5lV7nJh .label text,#mermaid-svg-Pt8AQGPjE5lV7nJh span{fill:#333;color:#333; }#mermaid-svg-Pt8AQGPjE5lV7nJh .node rect,#mermaid-svg-Pt8AQGPjE5lV7nJh .node circle,#mermaid-svg-Pt8AQGPjE5lV7nJh […]
[QT] Signals and slots can automatically pass parameters
1. Pre-sample code main.cpp #include “widget.h” #include <QApplication> // argc, argv receive mouse and keyboard commands and pass them to the QApplication object. int main(int argc, char *argv[]) {<!– –> QApplication a(argc, argv); // Application object a, in Qt, there is only one application object. Widget w; // Window object w, Widget parent class -> […]
[Signal] Signal saving {Data structure for managing signals: pending, block, handler; signal set; sigset_t type; signal set operation function; related system calls: sigpending, sigprocmask}
1. Related concepts Signal delivery: The actual processing action of executing the signal is called signal delivery (Delivery), including default, ignore and custom capture. Signal pending: The state between signal generation and delivery is called signal pending (Pending). Therefore, the signal bitmap mentioned above is also called Pending bitmap. Signal blocking (shielding): A process can […]
Qt Signals & Slots VS QEvents – Qt cross-thread asynchronous operation performance test and selection suggestions
Related code reference: https://gitcode.net/coloreaglestdio/qtcpp_demo/-/tree/master/qt_event_signal 1. Origin of the problem When implementing low-latency transformation of taskBus, avoiding the abuse of signals and slots played a better role. In the previous article, the author described how to improve the throughput of the software radio (SDR) platform by avoiding broadcast signals and frequent new and delete. Recently, considering […]
C++ – Implementing events and delegates, signals and slots mechanisms using the standard library
Use the C++ standard library to simply implement event triggering mechanism Event.h /* Author:StubbornHuang Data:2023.1.31 Email:[email protected] */ #ifndef _EVENT_H_ #define _EVENT_H_ #include <functional> #include <map> #include <type_traits> #ifndef EVENT_NO_THREAD_SAFETY #define EVENT_THREAD_SAFETY #endif // !EVENT_NO_THREAD_SAFETY #ifdef EVENT_THREAD_SAFETY #include <atomic> #include <mutex> #endif // EVENT_THREAD_SAFETY #ifdef EVENT_THREAD_SAFETY #define DELEGATE_ID_TYPE std::atomic_uint64_t #else #define DELEGATE_ID_TYPE std::uint64_t #endif // EVENT_THREAD_SAFETY […]
Assignment “Digital Signal Processing” gives a certain set of digital signals. In addition to the target signal, the signal is also mixed with strong noise, but the frequency of the noise and the target signal does not overlap. It is required to use the knowledge learned this semester to analyze the signal. at
“Digital Signal Processing” Big Assignment Table of contents 1. Question analysis… 2 1.1 HWDATA.MAT file… 2 1.2 Programming ideas… 2 1.3 Principle of FFT algorithm… 2 1.4 Butterworth filter design… 3 2. System block diagram:… 4 3. Code implementation and running results… 4 3.1 Import data… 4 3.2 Draw the original signal time domain waveform… […]
Implementing pulse pressure of 16 pulse signals and moving target display moving target detection MTIMTD based on Matlab
?About the author: A Matlab simulation developer who loves scientific research. He cultivates his mind and improves his technology simultaneously. For cooperation on MATLAB projects, please send a private message. Personal homepage: Matlab Research Studio Personal credo: Investigate things to gain knowledge. For more Matlab complete code and simulation customization content, click Intelligent optimization algorithm […]
[Radar signal analysis] Time domain analysis of linear frequency modulation signals based on LFM with Matlab code
?About the author: A Matlab simulation developer who loves scientific research. He cultivates his mind and improves his technology simultaneously. For cooperation on MATLAB projects, please send a private message. Personal homepage: Matlab Research Studio Personal credo: Investigate things to gain knowledge. For more complete Matlab code and simulation customization content, click Intelligent optimization algorithm […]