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I am in the process of developing a plugin for QGIS using Python. Note that this is my first plugin, so the query could be quite basic...

I have used this Digital Geography link to create the basic plugin, and (quite surprisingly found it easy) created the plugin files.

I am stuck at a very basic concept. Previously, while using Python IDLE, using 

QtCore.QObject.connect(self.Input, QtCore.SIGNAL("clicked()"), self.OpenBrowse)

to signal a click and writing a function OpenBrowse

    def OpenBrowse(self):
        self.Input_TB.setText(filename1)

I was able to open the Windows File Browse window on click and set the File location to an adjoining text box.

How do I do this while developing the plugin in the Python file that is created by Plugin Builder.? I am very confused about where should the code be written? Because if I place the 'clicked()' actions, etc. in the Python file generated from the UI file, it is not recognizing the variables as they are not global (obviously).

I am using QGIS 2.4, on a Windows 32-bit system.

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2 Answers 2

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Let us imagine your UI file name is MyDialogFile.py. Then,

from PyQt4.QtGui import QFileDialog
from MyDialogFile import MyDialog 

def InitGui(self):
    #other stuff....
    self.dialog = MyDialog()    

def OpenBrowse(self):        
    filename1 = QFileDialog.getOpenFileName()
    self.dialog.Input_TB.setText(filename1)
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  • This works in a normal IDLE program. The difference with that and PyQGIS is that the UI commands are in a different file and the actual tool execution program is in a different file. This does not work in this setup of PyQGIS. No errors, but just doesn't do what's needed..
    – Akhil
    Commented Sep 29, 2014 at 9:02
  • @Akhil - mmm...i think you should import the UI file into the tool execution .py file..something like, from MyDialogFile import MyDialog
    – vinayan
    Commented Sep 29, 2014 at 9:18
  • @Akhil - Updated my answer. you could look at some of the existing qgis plugins, like QuickWkt Plugin for example to see how it connects to UI, github.com/elpaso/quickwkt
    – vinayan
    Commented Sep 29, 2014 at 9:20
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Modifications need to be made in 3 different files in the folder generated by Plugin Builder... 

QtCore.QObject.connect(self.Input, QtCore.SIGNAL("clicked()"), self.OpenBrowse)

To be added in the UI File under the main Class... 

def OpenBrowse(self):        
    filename1 = QFileDialog.getOpenFileName()
    self.dialog.Input_TB.setText(filename1)

Function to be defined in the 'plugin_class_name'dialog.py file

and 

self.dialog = Ui_'Class_Name'()

in the main plugin python script under the initGui() function...

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