# Qt-Examples

**Repository Path**: spark-framework-libs/Qt-Examples

## Basic Information

- **Project Name**: Qt-Examples
- **Description**: https://github.com/RealChuan/Qt-Examples
- **Primary Language**: Unknown
- **License**: GPL-3.0
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2024-04-19
- **Last Updated**: 2024-04-19

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# Some simple common examples of Qt

-   [Simplified Chinese](README.md)
-   [English](README.en.md)

## [QT Practical Tips (Update as soon as I think of it) | Free Will (realchuan.github.io)](https://realchuan.github.io/2021/10/12/QT%E5%AE%9E%E7%94%A8%E5%B0%8F%E6%8A%80%E5%B7%A7%EF%BC%88%E6%83%B3%E5%88%B0%E5%B0%B1%E6%9B%B4%E6%96%B0%EF%BC%89/)

## [Battery](/Battery/)——Battery control

<table>
    <tr>
        <td ><div align=center><img src="Battery/picture/AlarmBattery.png"></div></td >
        <td ><div align=center><img src="Battery/picture/HealthyBattery.png"></div></td>
    </tr>
</table>

## [BatteryQuick](/BatteryQuick/)--battery control(`QtQuick`）

## [Bootstrap](/Bootstarp/)--Auto-start settings and detection when the program is powered on

1.  Reading and writing the registry under Windows enables self-starting at boot, and there are two locations where you can write;

    ```powershell
    HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run //对于所有用户
    HKEY_CURRENT_USER\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run // 对于当前用户
    ```

2.  Copy the plist file to ~/Library/LaunchAgents/ under MacOS, and use the launchctl load/unload command to achieve automatic startup at boot;

3.  There are two ways under Ubuntu:
    1.  Use the systemctl --user enable/disable command to achieve automatic startup at boot;
        1.  Copy the .service and .timer files to ~/.config/systemd/user/, and use the systemctl --user enable/disable command to implement automatic startup at boot;
        2.  The systemctl command is used in the .timer file, which is used to execute the .service file regularly to prevent the qxcbconnection: could not connect to display error from occurring after the graphical interface is started;
    2.  Copy the .desktop file under /usr/share/Application/ to ~/.config/autostart/ to achieve automatic startup at boot (not verified);

## [BubbleWindow](/BubbleWindow/)——Bubble dialog box, which can also be used as a tool tip (ToolTip)

<div align=center><img src="BubbleWindow/picture/Bubble.png"></div>

## [Chart](Chart/)——Visual chart drawing, reference[Use QChart to display real-time dynamic curves](https://qtdebug.com/qtbook-paint-realtime-curve-qchart/ "qtdebug/公孙二狗")Examples related to QChart

<div align=center><img src="Chart/picture/Chart_1.png">图一二是动态曲线</div>  
<div align=center><img src="Chart/picture/Chart_2.png">图一二是动态曲线， 图二坐标轴也会动态变化</div>

## [CheckBoxStandardItem](/CheckBoxStandardItem/)——StandardItem that can be checked, and the parent node status or child node status is automatically updated according to the checked status

<div align=center><img src="CheckBoxStandardItem/picture/checkBoxStandardItem.png"></div>

## [Clock](/Clock/)--clock

<div align=center><img src="Clock/picture/Clock.png"></div>

## [DashBoard](/DashBoard/)--dash board

<div align=center><img src="DashBoard/picture/DashBoard.png"></div>

## [FlowLayout](/FlowLayout/)——Flow layout, from QT example Flow Layout Example

<div align=center><img src="FlowLayout/picture/FlowLayout.png"></div>

## [DragDrop](/DragDrop/)——Simple control drag and drop, refer to the QT example Drag and Drop Puzzle Example

## [HttpClient](/HttpClient/)——http client

## [IconButton](/IconButton/)——EventFilter and Button that support Icon following state switching

## [ImageCarousel](/ImageCarousel/)——Simple picture carousel

<div align=center><img src="ImageCarousel/picture/ImageCarousel.jpg"></div>

## [GridViewModel](/GridViewModel/)——Adaptive palace chart based on QListView

<div align=center><img src="GridViewModel/picture/GridView.png"></div>

## [LogAsynchronous](/LogAsynchronous/)——Asynchronous logging, create a thread to write logs to files, and separate the front and back ends

1.  Log file name: application name (appname). time (time, accurate to seconds). host name. process ID (Tid). log (. count). If a single log written in a day is close to 1G, a suffix will be added automatically. (.1,.2.3..., and so on) Create a new log file to write, and rollFile will still be rolled at 0 o'clock every day;
    1.  Normal file name: LogAsynchronous.2020-04-26-20-29-03.Youth.11828.log;
    2.  The log written on that day was close to 1G, and the new file name was: LogAsynchronous.2020-04-26-20-38-55.Youth.11828.log.1;
2.  Log format: time (time, accurate to milliseconds). Thread ID (Pid). Log level (debug). Print information (msg). File (File). Line number (Line).
    1.  For example: 2020-04-26 20:38:55.818 2052[Debug]123456789qwertyuioplkjhgfdsa 8412789-File:(..\\logAsynchronous\\main.cpp) Line:(19)；

## [MulClient](/MulClient/)——Multi-threaded client, one client per thread (how to bypass system limitations and simulate millions of clients)

## [MulServer](/MulServer/)——Multi-threaded server, one thread and one client processing (processing TCP communication with high real-time performance)

## [Navigation Progress Bar](/NavigationProgressBar/)——Navigation progress bar

<div align=center><img src="NavigationProgressBar/picture/NavigationProgressBar.png"></div>

## [PasswordLineEdit](/PasswordLineEdit/)——Password input box

<table>
    <tr>
        <td ><div align=center><img src="PasswordLineEdit/picture/HiddenPassword.png"></div></td >
        <td ><div align=center><img src="PasswordLineEdit/picture/ShowPassword.png"></div></td>
    </tr>
</table>

## [ProgressArc](/ProgressArc/)——Arc progress bar

<div align=center><img src="ProgressArc/picture/ProgressArc.png"></div>

## [ProgressBar](/ProgressBar/)——QProgressBar rounded corner alternative

<div align=center><img src="ProgressBar/picture/ProgressBar.png"></div>

## [ReactorServer](/ReactorServer/)——Multi-threaded server, Reactor mode (Echo)

## [SimpleUdp](/SimpleUdp/)——Simple UDP example, broadcast and receive

## [ShowInMyComputer](/ShowInMyComputer/)——Show current applications in My Computer

Firewall whitelist.

## [SlipButton](/SlipButton/)——Sliding button

Another: A simpler implementation:[Animated CheckBox](http://qtdebug.com/qtbook-animated-checkbox/)；

<table>
      <tr>
          <td ><div align=center><img src="SlipButton/picture/SlipButton_check.png"></div></td >
          <td ><div align=center><img src="SlipButton/picture/SlipButton_checked.png"></div></td>
      </tr>
  </table>

## [SqliteWAL](/SqliteWAL/)——Multi-threaded concurrent writing database program in Sqlite WAL mode

### Advantages of WAL mode

1.  Improved concurrency: WAL mode allows multiple readers and one writer to access the database at the same time, which can improve concurrency and performance;
2.  Crash recovery: WAL mode ensures that the database remains consistent in the event of a crash by flushing all changes to the log file before committing the transaction;
3.  Improved write performance: WAL mode allows concurrent writes, which can improve write performance better than the default rollback mode;

### Things to note about WAL mode

1.  WAL mode is only available in SQLite 3.35.5+ versions;
2.  Increased disk usage: WAL mode requires more disk space than rollback mode because it writes all changes to the log file before committing them;
3.  Slow read performance: In WAL mode, read operations are not blocked by write operations. If read and write operations are performed at the same time, data inconsistency may result.

## [TableViewModel](/TableViewModel/)——Table view

1.  Various custom agents
    1.  [ButtonDelegate](./TableViewModel/buttondelegate.h)；
    2.  [ComboBoxDelegate](./TableViewModel/comboboxdelegate.h)；
    3.  [ProgressBarDelegate](./TableViewModel/progressbardelegate.h)；
    4.  [RichTextItemDelegate](./TableViewModel/richtextitemdelegate.hpp)；
    5.  [StarDelegate](./TableViewModel/stardelegate.h)----From Qt example Star Delegate Example;
2.  One hundred thousand level data rendering;

<div align=center><img src="TableViewModel/picture/TabViewModelDelegate.jpg"></div>

## [Thread](/Thread/)——Multi-threading examples, 6 ways of writing

## [TreeViewModel](/TreeViewModel/)——Tree view (MVC), QtCreator source code

<div align=center><img src="TreeViewModel/picture/TreeView.png"></div>  
<div align=center><img src="TreeViewModel/picture/ListView.png"></div>

## [Validator](/Validator/)——Enhanced versions of IntValidator (QIntValidator) and DoubleValidator (QDoubleValidator)

## [packaging](/packaging/)——Packaging script

1.  [macos](/packaging/macos/)——macos qmake compiles and packages dmg package script (`python`/`appdmg`）；

2.  [ubuntu](/packaging/ubuntu/)——Ubuntu qmake compiles and packages AppImage/deb package script (`linuxdeployqt-continuous-x86_64.AppImage`/`dpkg-deb`）；

    1.  [A way to open an application with root privileges](/packaging/ubuntu/opt/MyApp/MyApp.sh)：

        ```shell
        #!/bin/sh
        pkexec env DISPLAY=$DISPLAY XAUTHORITY=$XAUTHORITY /opt/MyApp/MyApp
        ```

3.  [windows](/packaging/windows/)——windows qmake compilation, packaging and installation script (`Innosetup`）；

    1.  `Innosetup``signtool`

            sha256="C:\\Program Files (x86)\\Windows Kits\\10\\bin\\10.0.18362.0\\x86\\signtool.exe" sign /f C:\\certificate\\certificate.pfx /p password /fd SHA256 /tr http://timestamp.digicert.com/scripts/timestamp.dll /td SHA256 $f