Gtk2::Ex::WidgetBits - miscellaneous Gtk widget helpers


 use Gtk2::Ex::WidgetBits;


Widget Position

($x,$y) = Gtk2::Ex::WidgetBits::get_root_position ($widget)

Return the position of the top left corner of $widget in root window coordinates. If $widget is unrealized the return is an empty list ().

This uses Gtk2::Ex::GdkBits::window_get_root_position so takes the most recently recorded window positions rather than making an X server round-trip.

Gtk2::Ex::WidgetBits::warp_pointer ($widget, $x, $y)

Warp, ie. forcibly move, the mouse pointer to $x,$y in $widget coordinates (ie. relative to the widget's top-left corner). $widget must be realized, since otherwise it doesn't have a screen position.

See Gtk2::Gdk::Display for the basic warp_pointer in root window coordinates. The code here converts using get_root_position above, so there's no server round-trip. Warping is available in Gtk 2.2 up.

The underlying XWarpPointer operates relative to any window, not just the root, but Gdk doesn't make that feature available.

($x,$y) = Gtk2::Ex::WidgetBits::xy_root_to_widget ($widget, $root_x,$root_y)

Convert a root window X,Y position to widget coordinates. If $widget is not realized then it doesn't have a screen position and the return is an empty list.

    if (my ($x,$y) = Gtk2::Ex::WidgetBits::xy_root_to_widget
                        ($widget, $x_root, $y_root)) {
       # widget $x,$y
    } else {
       # $widget is not realized, no values

Widget Distances

In the following functions, sizes in millimetres come from the screen (Gtk2::Gdk::Screen). A widget has a screen when it's been added as a child somewhere under a toplevel Gtk2::Window etc. Or in Gtk 2.0.x there's only ever one screen and its size is always used (Gtk2->init required).

($width_mm, $height_mm) = Gtk2::Ex::WidgetBits::pixel_size_mm ($widget)

Return the width and height in millimetres of a pixel in $widget. If $widget doesn't have a screen then return no values.

   my ($xmm, $ymm) = Gtk2::Ex::WidgetBits::pixel_size_mm ($widget)
     or print "no screen yet";
$ratio = Gtk2::Ex::WidgetBits::pixel_aspect_ratio ($widget)

Return the ratio width/height of pixel size in millimetres in $widget. For example if a pixel is 3mm wide by 2mm high then the ratio would be 1.5. If $widget doesn't have a screen then return undef.

This ratio is the same way around as Gtk2::AspectFrame. Setting the ratio property to this pixel ratio makes the child square on the monitor.

$mm = Gtk2::Ex::WidgetBits::xy_distance_mm ($widget, $x1,$y1, $x2,$y2)

Return the distance in millimetres between pixel points $x1,$y1 and $x2,$y2 in $widget. If $widget doesn't have a screen then return undef.


Gtk2::Ex::AdjustmentBits, Gtk2::Ex::EntryBits, Gtk2::Ex::GdkBits, Gtk2::Ex::MenuBits, Gtk2::Ex::TextBufferBits, Gtk2::Ex::TreeModelBits, Gtk2::Ex::TreeModel::ImplBits, Gtk2::Ex::TreeViewBits, Gtk2::Ex::Units

Gtk2::Ex::ActionTooltips, Gtk2::Ex::KeySnooper, Gtk2::Ex::SyncCall, Gtk2::Ex::Statusbar::MessageUntilKey, Gtk2::Ex::TreeModelFilter::Change, Test::Weaken::Gtk2

Gtk2::Widget, Gtk2::Ex::WidgetCursor.



Copyright 2008, 2009, 2010, 2011, 2012 Kevin Ryde

Gtk2-Ex-WidgetBits is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version.

Gtk2-Ex-WidgetBits is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with Gtk2-Ex-WidgetBits. If not, see