How can I read in Qt listWidget functionality as Qgis the raster calculator?

Question

I want to create a module in Qgis, my raster calculator, I'm stuck in the moment as it is possible to read raster files, just like in Qgis. If we open the raster calculator Qgis, we see in the raster channel our raster files with which we can perform mathematical operations

In my code it reads the raster channel as plain text

def run(self):
    """Run method that performs all the real work"""
    layer_list = []
    layers = self.iface.legendInterface().layers()
    for layer in layers:
         layer_list.append(layer.name())
         self.dlg.listWidget.addItems(layer_list)

    # show the dialog
    self.dlg.show()
    # Run the dialog event loop
    result = self.dlg.exec_()
    # See if OK was pressed
    if result:
        # Do something useful here - delete the line containing pass and
        # substitute with your code.
        pass

How now to specify what he would perceive in the listWidget, how exactly the raster (this is necessary so that later I could add the functions Gdal and read the channels of the raster)

Answer 1

QTextEdit is probably not the good Widget for you. Maybe you can try with something like QListWidget. You can use it as in this example:https://wiki.python.org/moin/PyQt/Adding%20items%20to%20a%20list%20widget

   1 import sys
   2 from PyQt4.QtGui import *
   3 
   4 layers = self.iface.legendInterface().layers()
   5 listWidget =  self.dlg.yourQListWidget()
   6 
   7 for layer in layers:
   8     item = QListWidgetItem(layer.name())
   9     listWidget.addItem(item)

And you can get documentation :http://pyqt.sourceforge.net/Docs/PyQt4/qlistwidget.html