Kivy Tutorial 4
In part 4 of my Kivy video tutorial we’ll make an interface for a student database and a toolbar. We’ll look at how ListViews, ListAdapters and much more work. By the end you’ll be able to take what we learned in part 26 of my learn to program series and have a working database app with Kivy.
All of the code and a cheat sheet follows the video below. Feel free to do what ever you’d like with it.
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# ---------- KIVY TUTORIAL PT 4 ---------- # In this part of my Kivy tutorial I'll show how to use # the ListView, ListAdapter and how to create a toolbar # ---------- studentdb.py ---------- from kivy.app import App from kivy.uix.boxlayout import BoxLayout from kivy.properties import ObjectProperty from kivy.uix.listview import ListItemButton class StudentListButton(ListItemButton): pass class StudentDB(BoxLayout): # Connects the value in the TextInput widget to these # fields first_name_text_input = ObjectProperty() last_name_text_input = ObjectProperty() student_list = ObjectProperty() def submit_student(self): # Get the student name from the TextInputs student_name = self.first_name_text_input.text + " " + self.last_name_text_input.text # Add the student to the ListView self.student_list.adapter.data.extend([student_name]) # Reset the ListView self.student_list._trigger_reset_populate() def delete_student(self, *args): # If a list item is selected if self.student_list.adapter.selection: # Get the text from the item selected selection = self.student_list.adapter.selection[0].text # Remove the matching item self.student_list.adapter.data.remove(selection) # Reset the ListView self.student_list._trigger_reset_populate() def replace_student(self, *args): # If a list item is selected if self.student_list.adapter.selection: # Get the text from the item selected selection = self.student_list.adapter.selection[0].text # Remove the matching item self.student_list.adapter.data.remove(selection) # Get the student name from the TextInputs student_name = self.first_name_text_input.text + " " + self.last_name_text_input.text # Add the updated data to the list self.student_list.adapter.data.extend([student_name]) # Reset the ListView self.student_list._trigger_reset_populate() class StudentDBApp(App): def build(self): return StudentDB() dbApp = StudentDBApp() dbApp.run() # ---------- studentdb.kv ---------- # Reference studentdb.py #: import main studentdb #: import ListAdapter kivy.adapters.listadapter.ListAdapter #: import ListItemButton kivy.uix.listview.ListItemButton StudentDB: <StudentDB>: orientation: "vertical" first_name_text_input: first_name last_name_text_input: last_name student_list: students_list_view padding: 10 spacing: 10 BoxLayout: size_hint_y: None height: "40dp" Label: text: "First Name" TextInput: id: first_name Label: text: "Last Name" TextInput: id: last_name BoxLayout: size_hint_y: None height: "40dp" Button: text: "Submit" size_hint_x: 15 on_press: root.submit_student() Button: text: "Delete" size_hint_x: 15 on_press: root.delete_student() Button: text: "Replace" size_hint_x: 15 on_press: root.replace_student() # Define starting data and point to the ListItemButton # in the Python code ListView: id: students_list_view adapter: ListAdapter(data=["Doug Smith"], cls=main.StudentListButton) # ---------- kivytut.py ---------- import kivy kivy.require("1.9.0") from kivy.app import App from kivy.uix.gridlayout import GridLayout class SampGridLayout(GridLayout): pass class SampleApp(App): def build(self): return SampGridLayout() sample_app = SampleApp() sample_app.run() # ---------- sample.kv ---------- <SampGridLayout>: rows: 2 BoxLayout: size_hint_y: None height: 30 spacing: 10 # Make the background for the toolbar white canvas: Color: rgba: 1, 1, 1, 1 Rectangle: pos: self.pos size: self.size Button: background_normal: 'open.png' background_down: 'open_dn.png' size_hint_x: None width: 30 Button: background_normal: 'disk.png' background_down: 'disk_dn.png' size_hint_x: None width: 30 Button: background_normal: 'exit.png' background_down: 'exit_dn.png' size_hint_x: None width: 30 |
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