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Gtk2::ImageView::Tool(3pm) User Contributed Perl Documentation Gtk2::ImageView::Tool(3pm)
NAME
Gtk2::ImageView::Tool - Interface for objects capable of being used as tools by Gtk2::ImageView
DESCRIPTION
Gtk2::ImageView::Tool is an interface that defines how Gtk2::ImageView interacts with objects that acts as tools. Gtk2::ImageView delegates
many of its most important tasks (such as drawing) to its tool which carries out all the hard work. The Gtk2::ImageView package comes with
two tools; Gtk2::ImageView::Tool::Dragger and Gtk2::ImageView::Tool::Selector, but by implementing your own tool it is possible to extend
Gtk2::ImageView to do stuff its author didn't imagine.
Gtk2::ImageView uses Gtk2::ImageView::Tool::Dragger by default, as that tool is he most generally useful one. However, it is trivial to
make it use another tool.
my $view = Gtk2::ImageView->new;
my $tool = Gtk2::ImageView::Tool::Selector ($view);
$view->set_tool ($tool);
Using the above code makes the view use the selector tool instead of the default dragger tool.
HIERARCHY
Glib::Interface
+----Gtk2::ImageView::Tool
METHODS
boolean = $tool->button_press ($ev)
o $ev (Gtk2::Gdk::Event)
boolean = $tool->button_release ($ev)
o $ev (Gtk2::Gdk::Event)
cursor = $tool->cursor_at_point ($x, $y)
o $x (integer)
o $y (integer)
Returns the cursor to display at the given coordinates.
boolean = $tool->motion_notify ($ev)
o $ev (Gtk2::Gdk::Event)
$tool->paint_image ($opts, $drawable)
o $opts (Gtk2::Gdk::Pixbuf::Draw::Opts)
o $drawable (Gtk2::Gdk::Drawable)
Called whenever the image view decides that any part of the image it shows needs to be redrawn.
$tool->pixbuf_changed ($reset_fit, $rect)
o $reset_fit (boolean)
o $rect (Gtk2::Gdk::Rectangle)
Indicate to the tool that either a part of, or the whole pixbuf that the image view shows has changed. This method is called by the view
whenever its pixbuf or its tool changes. That is, when any of the following methods are used:
Gtk2::ImageView::set_pixbuf()
Gtk2::ImageView::set_tool()
Gtk2::ImageView::damage_pixels()
If the reset_fit parameter is TRUE, it means that a new pixbuf has been loaded into the view.
tool : the tool
reset_fit : whether the view is resetting its fit mode or not
rect : rectangle containing the changed area or NULL
SEE ALSO
Gtk2::ImageView, Glib::Interface
COPYRIGHT
Copyright (C) 2007 by Jeffrey Ratcliffe.
This software is licensed under the GPL-3; see Gtk2::ImageView for a full notice.
perl v5.14.2 2011-11-16 Gtk2::ImageView::Tool(3pm)
