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Create a plugin#

Plugin module#

Plugins are the main components of the application. All elements that you see on the graphical interface are plugins that come with the cutevariant application.
Plugins are python modules located in the plugins folder. If you want to create your own plugin, you must create a module with the following structure. The plugin module contains following files.

├─ plot_graph/  
   └─  // 1
   └─    // 2
   └─  // 3
   └─    // 4
   └─      // 4
  1. Module description with plugin name, author, version and text description
  2. A widget plugin for the main view. Contain a class inherited from PluginWidget
  3. A settings widget in settings dialog. Contain a class inherited from PluginSettingDialog
  4. A dialog widget available from tool menu. Contain a class inherited from PluginDialog
  5. Testing your plugin is strongly advice

Plugin Dialog#

Plugin dialog are available from the main window tool menu. There are intended to perform action independently of the main window.
To create a plugin dialog, create file with a class inherited from PluginDialog. You can interact with the sqlite database using self.conn.


the class name must be the same as the module name. Here, the module name is plot_graph in snake case. Then the class must be PlotGraphDialog in camel calse.

Here is a short example showing a dialog with a button triggered a print action.

from cutevariant.gui.plugin import PluginDialog

class PlotGraphDialog(PluginDialog):
    """Model class for all tool menu plugins

    These plugins are based on DialogBox; this means that they could be opened
    from the tools menu.

    def __init__(self, parent: MainWindow =None):
            parent (QMainWindow): cutevariant Mainwindow

        self.button = QPushButton("hello", self)

    def on_click(self):
        print(" I m using this sqlite connection", self.conn)

Plugin Widget#

To create a plugin is displayed in the main window, you have to create a class inherited from PluginWidget in the


the class name must be the same as the module name. Here, the module name is plot_graph in snake case. Then the class must be PlotGraphPlugin in camel calse.

Three methods can be overloaded to react from the mainwindow.

from cutevariant.gui.plugin import PluginWidget

class PlotGraphPlugin(PluginWidget):

    # Location of the plugin in the mainwindow
    # Make the plugin enable. Otherwise, it will be not loaded

    # Refresh the plugin only if the following state variable changed.
    # Can be : fields, filters, source 
    REFRESH_STATE_DATA = set("fields","filters")

    def on_register(self, mainwindow: MainWindow):
        """This method is called when the plugin is registered from the mainwindow. 

        This is called one time at the application startup.

            mainwindow (MainWindow): cutevariant Mainwindow

    def on_open_project(self, conn: sqlite3.Connection):
        """This method is called when a project is opened

        Do your initialization here.
        You may want to store the conn variable to use it later. 

            conn (sqlite3.connection): A connection to the sqlite project

    def on_refresh(self):
        """This method is called from mainwindow.refresh_plugins()

        You may want to overload this method to update the plugin state 
        when query changed

Plugin Settings#

Settings widget makes possible to configure your plugin with a user interface. They are available from mainwindow > settings menu. To create a settings widget, create a file with a class inherited from settings.SectionWidget. This class contains a list of AbstractSettingsWidget displayed as page in settings dialog.

from cutevariant.gui.plugin import PluginSettingsWidget
from cutevariant.gui.settings import AbstractSettingsWidget
from PySide2.QtWidgets import QSpinBox

class SampleMemorySettings(AbstractSettingsWidget):

    def __init__(self, parent = None):

        self.input = QSpinBox(self)

    def save(self):
        config = self.create_config()
        config["memory"] = self.input.value() 

    def load(self):
        config = self.create_config()
        self.input.setValue(config.get("memory", 32))

class SamplePluginSettingsWidget(PluginSettingsWidget):
    """Model class for settings plugins"""

    def __init__(self, parent = None):