Viewing file:  print_editor.py (13.57 KB) -rw-r--r--
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"""Print Editor
A small demo editor with printing support"""
import sys
import gobject
import pango
import gtk
main_window = None
filename = None
page_setup = None
settings = None
file_changed = False
buffer = None
statusbar = None
active_prints = []
def update_title():
if filename is None:
basename = "Untitled"
else:
basename = os.path.basename(filename)
main_window.set_title("Simple Editor with printing - %s" % basename)
def update_statusbar():
statusbar.pop(0)
iter = buffer.get_iter_at_mark(buffer.get_insert())
row = iter.get_line()
col = iter.get_line_offset()
print_str = "";
if active_prints:
op = active_prints[0]
print_str = op.get_status_string()
msg = "%d, %d%s %s" % (row, col, (file_changed and " - Modified" or ""),
print_str)
statusbar.push(0, msg)
def update_ui():
update_title()
update_statusbar()
def get_text():
start, end = buffer.get_bounds()
return buffer.get_text(start, end, False)
def set_text(text):
buffer.set_text(text)
global file_changed
file_changed = False
update_ui()
def do_new(action):
global filename
filename = None
set_text("")
def load_file(open_filename):
error_dialog = None
try:
contents = file(open_filename).read()
except IOError, ex:
error_dialog = gtk.MessageDialog(main_window,
gtk.DIALOG_DESTROY_WITH_PARENT,
gtk.MESSAGE_ERROR,
gtk.BUTTONS_CLOSE,
"Error loading file %s:\n%s" %
(open_filename,
str(ex)))
else:
try:
contents = contents.decode("utf-8")
except UnicodeDecodeError:
error_dialog = gtk.MessageDialog(main_window,
gtk.DIALOG_DESTROY_WITH_PARENT,
gtk.MESSAGE_ERROR,
gtk.BUTTONS_CLOSE,
"Error loading file %s:\n%s" %
(open_filename,
"Not valid utf8"))
else:
set_text(contents)
if error_dialog is not None:
error_dialog.connect("response", gtk.Widget.destroy)
error_dialog.show()
def do_open(action):
dialog = gtk.FileChooserDialog("Select file",
main_window,
gtk.FILE_CHOOSER_ACTION_OPEN,
(gtk.STOCK_CANCEL, gtk.RESPONSE_CANCEL,
gtk.STOCK_OPEN, gtk.RESPONSE_OK))
dialog.set_default_response(gtk.RESPONSE_OK)
response = dialog.run()
if response == gtk.RESPONSE_OK:
open_filename = dialog.get_filename()
load_file(open_filename)
dialog.destroy()
def save_file(save_filename):
global filename
text = get_text()
error_dialog = None
try:
file(save_filename, "w").write(text)
except IOError, ex:
error_dialog = gtk.MessageDialog(main_window,
gtk.DIALOG_DESTROY_WITH_PARENT,
gtk.MESSAGE_ERROR,
gtk.BUTTONS_CLOSE,
"Error saving to file %s:\n%s" %
(open_filename,
str(ex)))
error_dialog.connect("response", gtk.Widget.destroy)
error_dialog.show()
else:
if save_filename != filename:
filename = save_filename
file_changed = False
update_ui()
def do_save_as(action):
dialog = gtk.FileChooserDialog("Select file",
main_window,
(gtk.FILE_CHOOSER_ACTION_SAVE,
gtk.STOCK_CANCEL, gtk.RESPONSE_CANCEL,
gtk.STOCK_SAVE, gtk.RESPONSE_OK))
dialog.set_default_response(gtk.RESPONSE_OK)
response = dialog.run()
if response == gtk.RESPONSE_OK:
save_filename = dialog.get_filename()
save_file(save_filename)
dialog.destroy()
def do_save(action):
if filename is None:
do_save_as(action)
else:
save_file(filename)
class PrintData:
text = None
layout = None
page_breaks = None
def begin_print(operation, context, print_data):
width = context.get_width()
height = context.get_height()
print_data.layout = context.create_pango_layout()
print_data.layout.set_font_description(pango.FontDescription("Sans 12"))
print_data.layout.set_width(int(width*pango.SCALE))
print_data.layout.set_text(print_data.text)
num_lines = print_data.layout.get_line_count()
page_breaks = []
page_height = 0
for line in xrange(num_lines):
layout_line = print_data.layout.get_line(line)
ink_rect, logical_rect = layout_line.get_extents()
lx, ly, lwidth, lheight = logical_rect
line_height = lheight / 1024.0
if page_height + line_height > height:
page_breaks.append(line)
page_height = 0
page_height += line_height
operation.set_n_pages(len(page_breaks) + 1)
print_data.page_breaks = page_breaks
def draw_page(operation, context, page_nr, print_data):
assert isinstance(print_data.page_breaks, list)
if page_nr == 0:
start = 0
else:
start = print_data.page_breaks[page_nr - 1]
try:
end = print_data.page_breaks[page_nr]
except IndexError:
end = print_data.layout.get_line_count()
cr = context.get_cairo_context()
cr.set_source_rgb(0, 0, 0)
i = 0
start_pos = 0
iter = print_data.layout.get_iter()
while 1:
if i >= start:
line = iter.get_line()
_, logical_rect = iter.get_line_extents()
lx, ly, lwidth, lheight = logical_rect
baseline = iter.get_baseline()
if i == start:
start_pos = ly / 1024.0;
cr.move_to(lx / 1024.0, baseline / 1024.0 - start_pos)
cr.show_layout_line(line)
i += 1
if not (i < end and iter.next_line()):
break
def do_page_setup(action):
global settings, page_setup
if settings is None:
settings = gtk.PrintSettings()
page_setup = gtk.print_run_page_setup_dialog(main_window,
page_setup, settings)
def status_changed_cb(op):
if op.is_finished():
active_prints.remove(op)
update_statusbar()
def do_print(action):
global settings, page_setup
print_data = PrintData()
print_data.text = get_text()
print_ = gtk.PrintOperation()
if settings is not None:
print_.set_print_settings(settings)
if page_setup is not None:
print_.set_default_page_setup(page_setup)
print_.connect("begin_print", begin_print, print_data)
print_.connect("draw_page", draw_page, print_data)
try:
res = print_.run(gtk.PRINT_OPERATION_ACTION_PRINT_DIALOG, main_window)
except gobject.GError, ex:
error_dialog = gtk.MessageDialog(main_window,
gtk.DIALOG_DESTROY_WITH_PARENT,
gtk._MESSAGE_ERROR,
gtk.BUTTONS_CLOSE,
("Error printing file:\n%s" % str(ex)))
error_dialog.connect("response", gtk.Widget.destroy)
error_dialog.show()
else:
if res == gtk.PRINT_OPERATION_RESULT_APPLY:
settings = print_.get_print_settings()
if not print_.is_finished():
active_prints.remove(print_)
update_statusbar()
print_.connect("status_changed", status_changed_cb)
def do_about(action):
authors = [
"Alexander Larsson (C version)",
"Gustavo Carneiro (Python translation)",
]
about = gobject.new(gtk.AboutDialog, name="print test editor",
version="0.1", copyright="(C) Red Hat, Inc",
comments="Program to demonstrate GTK+ printing.",
authors=authors)
about.set_transient_for(main_window)
about.show()
def do_quit(action):
if __name__ == '__main__':
gtk.main_quit()
entries = [
( "FileMenu", None, "_File" ), # name, stock id, label
( "HelpMenu", None, "_Help" ), # name, stock id, label
( "New", gtk.STOCK_NEW, # name, stock id
"_New", "<control>N", # label, accelerator
"Create a new file", # tooltip
do_new ),
( "Open", gtk.STOCK_OPEN, # name, stock id
"_Open","<control>O", # label, accelerator
"Open a file", # tooltip
do_open ),
( "Save", gtk.STOCK_SAVE, # name, stock id
"_Save","<control>S", # label, accelerator
"Save current file", # tooltip
do_save ),
( "SaveAs", gtk.STOCK_SAVE, # name, stock id
"Save _As...", None, # label, accelerator
"Save to a file", # tooltip
do_save_as ),
( "Quit", gtk.STOCK_QUIT, # name, stock id
"_Quit", "<control>Q", # label, accelerator
"Quit", # tooltip
do_quit ),
( "About", None, # name, stock id
"_About", "<control>A", # label, accelerator
"About", # tooltip
do_about ),
( "PageSetup", None, # name, stock id
"Page _Setup", None, # label, accelerator
"Set up the page", # tooltip
do_page_setup ),
( "Print", gtk.STOCK_PRINT, # name, stock id
None, None, # label, accelerator
"Print the document", # tooltip
do_print ),
]
ui_info ="""
<ui>
<menubar name='MenuBar'>
<menu action='FileMenu'>
<menuitem action='New'/>
<menuitem action='Open'/>
<menuitem action='Save'/>
<menuitem action='SaveAs'/>
<menuitem action='PageSetup'/>
<menuitem action='Print'/>
<separator/>
<menuitem action='Quit'/>
</menu>
<menu action='HelpMenu'>
<menuitem action='About'/>
</menu>
</menubar>
</ui>
"""
def buffer_changed_callback(buffer):
global file_changed
file_changed = True
update_statusbar()
def mark_set_callback(buffer, new_location, mark):
update_statusbar()
def update_resize_grip(widget, event, statusbar):
if event.changed_mask & (gtk.gdk.WINDOW_STATE_MAXIMIZED |
gtk.gdk.WINDOW_STATE_FULLSCREEN):
maximized = event.new_window_state & (gtk.gdk.WINDOW_STATE_MAXIMIZED |
gtk.gdk.WINDOW_STATE_FULLSCREEN)
statusbar.set_has_resize_grip(not maximized)
def create_window():
global main_window, statusbar, buffer
main_window = gtk.Window()
main_window.set_default_size(400, 600)
if __name__ == '__main__':
main_window.connect("delete-event", gtk.main_quit)
actions = gtk.ActionGroup("Actions")
actions.add_actions(entries)
ui = gtk.UIManager()
ui.insert_action_group(actions, 0)
main_window.add_accel_group(ui.get_accel_group())
main_window.set_border_width(0)
ui.add_ui_from_string(ui_info)
table = gtk.Table(1, 3, False)
main_window.add(table)
bar = ui.get_widget("/MenuBar")
bar.show()
table.attach(bar,
# /* X direction */ /* Y direction */
0, 1, 0, 1,
gtk.EXPAND | gtk.FILL, 0,
0, 0)
## Create document
sw = gtk.ScrolledWindow()
sw.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_AUTOMATIC)
sw.set_shadow_type(gtk.SHADOW_IN)
table.attach(sw,
# /* X direction */ /* Y direction */
0, 1, 1, 2,
gtk.EXPAND | gtk.FILL, gtk.EXPAND | gtk.FILL,
0, 0)
contents = gtk.TextView()
contents.grab_focus()
sw.add(contents)
## Create statusbar
statusbar = gtk.Statusbar()
table.attach(statusbar,
#/* X direction */ /* Y direction */
0, 1, 2, 3,
gtk.EXPAND | gtk.FILL, 0,
0, 0);
## Show text widget info in the statusbar */
buffer = contents.get_buffer()
buffer.connect_object("changed",
buffer_changed_callback,
None)
buffer.connect_object("mark_set", # cursor moved
mark_set_callback,
None)
main_window.connect_object("window_state_event",
update_resize_grip,
statusbar,
0)
update_ui()
main_window.show_all()
def main(argv):
create_window()
try:
fname = argv[1]
except IndexError:
pass
else:
load_file(fname)
gtk.main()
def PrintEditorDemo(win):
create_window()
main_window.set_transient_for(win)
return main_window
if __name__ == '__main__':
sys.exit(main(sys.argv))
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