# Toolbar (Python)

Marta Maria Casetti
mmcasetti@gmail.com 2012
Unha barra de botóns e outros widgets
Fran Dieguez
frandieguez@gnome.org 2012-2013.

# Barra de ferramentas

An example of toolbar with buttons (from stock icons).

# Código usado para xerar este exemplo

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

class MyWindow(Gtk.ApplicationWindow):

def __init__(self, app): Gtk.Window.__init__(self, title="Toolbar Example", application=app) self.set_default_size(400, 200)

# a grid to attach the toolbar grid = Gtk.Grid()

# a toolbar created in the method create_toolbar (see below) toolbar = self.create_toolbar() # with extra horizontal space toolbar.set_hexpand(True) # show the toolbar toolbar.show()

# attach the toolbar to the grid grid.attach(toolbar, 0, 0, 1, 1)

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

# create the actions that control the window and connect their signal to a # callback method (see below):

# undo undo_action = Gio.SimpleAction.new("undo", None) undo_action.connect("activate", self.undo_callback) self.add_action(undo_action)

# fullscreen fullscreen_action = Gio.SimpleAction.new("fullscreen", None) fullscreen_action.connect("activate", self.fullscreen_callback) self.add_action(fullscreen_action)

# a method to create the toolbar def create_toolbar(self): # a toolbar toolbar = Gtk.Toolbar()

# which is the primary toolbar of the application toolbar.get_style_context().add_class(Gtk.STYLE_CLASS_PRIMARY_TOOLBAR)

# create a button for the "new" action, with a stock image new_button = Gtk.ToolButton.new_from_stock(Gtk.STOCK_NEW) # label is shown new_button.set_is_important(True) # insert the button at position in the toolbar toolbar.insert(new_button, 0) # show the button new_button.show() # set the name of the action associated with the button. # The action controls the application (app) new_button.set_action_name("app.new")

# button for the "open" action open_button = Gtk.ToolButton.new_from_stock(Gtk.STOCK_OPEN) open_button.set_is_important(True) toolbar.insert(open_button, 1) open_button.show() open_button.set_action_name("app.open")

# button for the "undo" action undo_button = Gtk.ToolButton.new_from_stock(Gtk.STOCK_UNDO) undo_button.set_is_important(True) toolbar.insert(undo_button, 2) undo_button.show() undo_button.set_action_name("win.undo")

# button for the "fullscreen/leave fullscreen" action self.fullscreen_button = Gtk.ToolButton.new_from_stock( Gtk.STOCK_FULLSCREEN) self.fullscreen_button.set_is_important(True) toolbar.insert(self.fullscreen_button, 3) self.fullscreen_button.set_action_name("win.fullscreen")

# return the complete toolbar return toolbar

# callback method for undo def undo_callback(self, action, parameter): print("You clicked \"Undo\".")

# callback method for fullscreen / leave fullscreen def fullscreen_callback(self, action, parameter): # check if the state is the same as Gdk.WindowState.FULLSCREEN, which # is a bit flag is_fullscreen = self.get_window().get_state( ) & Gdk.WindowState.FULLSCREEN != 0 if not is_fullscreen: self.fullscreen_button.set_stock_id(Gtk.STOCK_LEAVE_FULLSCREEN) self.fullscreen() else: self.fullscreen_button.set_stock_id(Gtk.STOCK_FULLSCREEN) self.unfullscreen()

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)

# create the actions that control the window and connect their signal to a # callback method (see below):

# new new_action = Gio.SimpleAction.new("new", None) new_action.connect("activate", self.new_callback) app.add_action(new_action)

# open open_action = Gio.SimpleAction.new("open", None) open_action.connect("activate", self.open_callback) app.add_action(open_action)

# callback method for new def new_callback(self, action, parameter): print("You clicked \"New\".")

# callback method for open def open_callback(self, action, parameter): print("You clicked \"Open\".")

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

# Useful methods for a Toolbar widget

In line 32 the signal `"activate"` from the action `undo_action` is connected to the callback function `undo_callback()` using `action.connect(signal, callback function)`. See for a more detailed explanation.

Use `insert(tool_item, position)` to insert the `tool_item` at `position`. If `position` is negative, the item is appended at the end of the toolbar.

`get_item_index(tool_item)` retrieves the position of `tool_item` on the toolbar.

`get_n_items()` returns the number of items on the toolbar; `get_nth_item(position)` returns the item in position `position`.

If the toolbar does not have room for all the menu items, and `set_show_arrow(True)`, the items that do not have room are shown through an overflow menu.

`set_icon_size(icon_size)` sets the size of icons in the toolbar; `icon_size` can be one of `Gtk.IconSize.INVALID, Gtk.IconSize.MENU, Gtk.IconSize.SMALL_TOOLBAR, Gtk.IconSize.LARGE_TOOLBAR, Gtk.IconSize.BUTTON, Gtk.IconSize.DND, Gtk.IconSize.DIALOG`. This should be used only for special-purpose toolbars, normal application toolbars should respect user preferences for the size of icons. `unset_icon_size()` unsets the preferences set with `set_icon_size(icon_size)`, so that user preferences are used to determine the icon size.

`set_style(style)`, where `style` is one of `Gtk.ToolbarStyle.ICONS, Gtk.ToolbarStyle.TEXT, Gtk.ToolbarStyle.BOTH, Gtk.ToolbarStyle.BOTH_HORIZ`, sets if the toolbar shows only icons, only text, or both (vertically stacked or alongside each other). To let user preferences determine the toolbar style, and unset a toolbar style so set, use `unset_style()`.

# API References

Neste exemplo empregaremos o seguinte:

GtkToolbar

GtkToolButton

GtkToolItem

Stock Items

GtkActionable

GtkWidget

Event Structures