# Statusbar (Python)

Marta Maria Casetti
mmcasetti@gmail.com 2012
Report messages of minor importance to the user
Mario Blättermann
mario.blaettermann@gmail.com 2011, 2013, 2016, 2018

# Statusbar

This statusbar tells you if you click the button or if you press any key (and which key).

# Code used to generate this example

from gi.repository import Gtk from gi.repository import Gdk import sys

class MyWindow(Gtk.ApplicationWindow): # a window

def __init__(self, app): Gtk.Window.__init__(self, title="StatusBar Example", application=app) self.set_default_size(200, 100)

# a label label = Gtk.Label(label="Press any key or ")

# a button button = Gtk.Button(label="click me.") # connected to a callback button.connect("clicked", self.button_clicked_cb)

# the statusbar self.statusbar = Gtk.Statusbar() # its context_id - not shown in the UI but needed to uniquely identify # the source of a message self.context_id = self.statusbar.get_context_id("example") # we push a message onto the statusbar's stack self.statusbar.push( self.context_id, "Waiting for you to do something...")

# a grid to attach the widgets grid = Gtk.Grid() grid.set_column_spacing(5) grid.set_column_homogeneous(True) grid.set_row_homogeneous(True) grid.attach(label, 0, 0, 1, 1) grid.attach_next_to(button, label, Gtk.PositionType.RIGHT, 1, 1) grid.attach(self.statusbar, 0, 1, 2, 1)

# add the grid to the window self.add(grid)

# callback function for the button clicked # if the button is clicked the event is signaled to the statusbar # onto which we push a new status def button_clicked_cb(self, button): self.statusbar.push(self.context_id, "You clicked the button.")

# event handler def do_key_press_event(self, event): # any signal from the keyboard is signaled to the statusbar # onto which we push a new status with the symbolic name # of the key pressed self.statusbar.push(self.context_id, Gdk.keyval_name(event.keyval) + " key was pressed.") # stop the signal emission return True

class MyApplication(Gtk.Application):

def __init__(self): Gtk.Application.__init__(self)

def do_activate(self): win = MyWindow(self) win.show_all()

def do_startup(self): Gtk.Application.do_startup(self)

app = MyApplication() exit_status = app.run(sys.argv) sys.exit(exit_status)

`Gdk.keyval_name(event.keyval)` converts the key value `event.keyval` into a symbolic name. The names and corresponding key values can be found here, but for instance `GDK_KEY_BackSpace` becomes the string `"BackSpace"`.

# Useful methods for a Statusbar widget

In line 17 the signal `"clicked"` is connected to the callback function `button_clicked_cb()` using `widget.connect(signal, callback function)`. See for a more detailed explanation.

`pop(context_id)` removes the first message in the statusbar stack with the given `context_id`.

`remove_all(context_id)` removes all the messages in the statusbar stack with the given `context_id`.

`remove(context_id, message_id)` removes the message with the given `message_id` in the statusbar stack with the given `context_id`. The `message_id` is returned by `push(context_id, "the message")` when pushing the message on the statusbar.

# API-Referenzen

In this sample we used the following:

GtkStatusbar

Gdk - Key Values