Gtk2::ImageView::Tool::Selector man page on Mandriva

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Gtk2::ImageView::Tool:UsereContributed Perl Gtk2::ImageView::Tool::Selector(3)

NAME
       Gtk2::ImageView::Tool::Selector -  Image tool for selecting rectangular
       regions

HIERARCHY
	 Glib::Object
	 +----Gtk2::ImageView::Tool::Selector

INTERFACES
	 Gtk2::ImageView::Tool

DESCRIPTION
       Gtk2::ImageView::Tool::Selector is a tool for selecting areas of an
       image. It is useful for cropping an image, for example. The tool is an
       implementor of the Gtk2::ImageView::Tool inteface which means that it
       can be plugged into a Gtk2::ImageView by using the
       Gtk2::ImageView::Tool::set_tool() method.

       Gtk2::ImageView::Tool::Selector changes the default display of the
       Gtk2::ImageView. It darkens down the unselected region of the image
       which provides a nice effect and makes it clearer what part of the
       image that is currently selected. Unfortunately, this effect is
       somewhat incompatible with how Gtk2::ImageView::Nav behaves because
       that widget will show the image without darkening it.

       The tool also changes the default behaviour of the mouse. When a
       Gtk2::ImageView::Tool::Selector is set on a Gtk2::ImageView, mouse
       presses do not "grab" the image and you cannot scroll by dragging.
       Instead mouse presses and dragging is used to resize and move the
       selection rectangle. When the mouse drags the selection rectangle to
       the border of the widget, the view autoscrolls which is a convenient
       way for a user to position the selection.

       Please note that Gtk2::ImageView::Tool::Selector draws the image in two
       layers.	One darkened and the selection rectangle in normal luminosity.
       Because it uses two draw operations instead one one like
       Gtk2::ImageView::Tool::Dragger does, it is significantly slower than
       that tool. Therefore, it makes sense for a user of this library to set
       the interpolation to GDK_INTERP_NEAREST when using this tool to ensure
       that performance is acceptable to the users of the program.

       Zoom bug

       There is a small bug in Gtk2::ImageView::Tool::Selector that becomes
       apparent when the zoom factor is greater than about 30. The edge of the
       selection rectangle may in that case intersect a pixel.

       The bug is caused by bug 389832 in gdk-pixbuf. There is no way to solve
       this bug on Gtk2::ImageView's level (but if someone knows how, I'd
       really like to know).

METHODS
       tool = Gtk2::ImageView::Tool::Selector->new ($view)

       ·   $view (Gtk2::ImageView)

       Returns a new selector tool for the specified view with the following
       default values:

       selection : (0, 0) - [0, 0]

       rectangle = $selector->get_selection

       Returns a Gtk2::Gdk::Rectangle with the current selection. If either
       the width or the height of the selection is zero, then nothing is
       selected and undef is returned. See "selection-changed" for an example.

       $selector->set_selection ($rect)

       ·   $rect (Gtk2::Gdk::Rectangle)

       Sets the selection rectangle for the tool. Setting this attribute will
       cause the widget to immidiately repaint itself if its view is realized.

       This method does nothing under the following circumstances:

       If the views pixbuf is undef.
       If rect is wider or taller than the size of the pixbuf
       If rect equals the current selection rectangle.

       If the selection falls outside the pixbufs area, its position is moved
       so that it is within the pixbuf.

       Calling this method causes the ::selection-changed signal to be
       emitted.

       The default selection is (0,0) - [0,0].

       selector : a Gtk2::ImageView::Tool::Selector
       rect : Selection rectangle in image space coordinates.

PROPERTIES
       'view' (Gtk2::ImageView : writable / construct-only)
	   Image View to navigate

SIGNALS
       selection-changed (Gtk2::ImageView::Tool::Selector)

SEE ALSO
       Gtk2::ImageView, Glib::Object

COPYRIGHT
       Copyright (C) 2007 by Jeffrey Ratcliffe.

       This software is licensed under the GPL-3; see Gtk2::ImageView for a
       full notice.

perl v5.10.0			  2009-07-29Gtk2::ImageView::Tool::Selector(3)
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