MapInfo Pro Developers User Group

Hi,

I am trying to write a Python addin that creates tabs and populates them with groups and controls based on the structure of a JSON file. Part of this is adding commands to the button which should be achieved by supplying the software with a command ID to an existing MapInfo function or a path to a .py or .MBX script for custom functionality. The relevant code is shown below, I've tried to do this by attaching a lambda function which just calls commonutil.do() on the "run application" mapbasic command for the supplied path. This adds the tab, group, and button and configures it mostly correctly, but nothing is called when I select the button. 

#Open json file
with open("C:/Users/romano/Documents/MapBasic/ModuleLoader/modules.json", 'r') as j:
     tabs = loads(j.read())
 
#Add tabs, groups, and buttons as outlined by JSON hierarchy
for tab in tabs["tabs"]:
     newTab = self.AddNewTabToRibbon(tab["progName"], tab["dispName"])
     for group in tab["groups"]:
          newGroup = self.AddNewGroupToTab(newTab, group["progName"], group["dispName"])
          for control in group["controls"]:
               #Translate control type from JSON spec to MapInfo internal enumeration
               controlType = buttSwitch.get(control["type"], ControlType.Button)
               #Add new control and get handle to it
               newControl = self.AddNewControlToGroup(newGroup, control["progName"], control["dispName"], controlType)
               #Set control large if specified
               newControl.IsLarge = control["large"]
               #if control["large"]:
               #     newControl.LargeIcon = control["img"]
               #else:
               #     newControl.SmallIcon = control["img"]
 
               #Assign anonymous function that calls a "run application" on the MBX specified in the command
               newControl.Command = AddinUtil.create_command(lambda self, sender: CommonUtil.do("run application \"{}\"".format(control["command"])))
               #newControl.Command = AddinUtil.create_command(self.test())

------------------------------
Romano Agostini
Knowledge Community Shared Account
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Attachment(s)

ModuleLoader.zip   28 KB 1 version

Hiya,

I've managed to figure out something that works, the issue seems to be that anonymous functions or their references are probably deleted at some point in the loading process. So the method needs to be stored in memory with a constant reference.

I therefore created a small holder class to hold the path and call run application on when needed.

#Small object, holds path to script and calls later on when assigned button is clicked
class custCommand():

    def __init__(self, path):
        self.path = path

    def call(self, sender):
        CommonUtil.do("run application \"{}\"".format(self.path))

When the JSON parser gets to the command keyword, it creates a new instance of the class and adds the script path to the object's path variable, places the object in a list held within the addin object and assigns that object's call function to the button's command.

    #Set up addin, called when MapInfo loads addin
    def __init__(self, imapinfopro, thisApplication):
        
        try:
            self._pro = imapinfopro
            self._thisApplication = thisApplication

            print("Loading modules...")

            #Create list to hold tab references
            self._newTab = []

            #Create list to hold custom command class references
            self._custCommands = []

            #Open json file
            with open("C:/Users/romano/Documents/MapBasic/ModuleLoader/modules.json", 'r') as j:
                 tabs = loads(j.read())

            #Add tabs, groups, and buttons as outlined by JSON hierarchy
            for tab in tabs["tabs"]:
                newTab = self.AddNewTabToRibbon(tab["progName"], tab["dispName"])
                for group in tab["groups"]:
                    newGroup = self.AddNewGroupToTab(newTab, group["progName"], group["dispName"])
                    for control in group["controls"]:
                        #Translate control type from JSON spec to MapInfo internal enumeration
                        controlType = buttSwitch.get(control["type"], ControlType.Button)
                        #Add new control and get handle to it
                        newControl = self.AddNewControlToGroup(newGroup, control["progName"], control["dispName"], controlType)
                        #Set control large if specified
                        newControl.IsLarge = control["large"]
                        #if control["large"]:
                        #    newControl.LargeIcon = control["img"]
                        #else:
                        #    newControl.SmallIcon = control["img"]

                        #Create new custom command object and append it to custCommands list for dereferencing later on
                        self._custCommands.append(custCommand(control["command"]))                        
                        newControl.Command = AddinUtil.create_command(self._custCommands[-1].call)

This works well for me, if anyone can find a better implementation or can see some issues with my code please let me know.

------------------------------
Romano Agostini
Knowledge Community Shared Account
------------------------------