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|
package Gtk3::ImageView::Tool::Selector;
use warnings;
use strict;
use base 'Gtk3::ImageView::Tool';
use Glib qw(TRUE FALSE); # To get TRUE and FALSE
use List::Util qw(min);
use Readonly;
Readonly my $RIGHT_BUTTON => 3;
Readonly my $EDGE_WIDTH => 5;
our $VERSION = '10';
sub button_pressed {
my ( $self, $event ) = @_;
if ( $event->button == $RIGHT_BUTTON ) {
return FALSE;
}
my $type = $self->cursor_type_at_point( $event->x, $event->y );
if ( $type eq 'grab' ) {
$type = 'grabbing';
$self->{drag_start_x} = int( $event->x + 0.5 );
$self->{drag_start_y} = int( $event->y + 0.5 );
}
$self->{dragging} = $type;
$self->_update_selection( $event->x, $event->y );
return FALSE;
}
sub button_released {
my ( $self, $event ) = @_;
if ( $event->button == $RIGHT_BUTTON ) {
return FALSE;
}
if ( $self->{dragging} ) {
$self->_update_selection( $event->x, $event->y );
}
$self->{dragging} = undef;
$self->view->update_cursor( $event->x, $event->y );
return FALSE;
}
sub motion {
my ( $self, $event ) = @_;
if ( $self->{dragging} ) {
$self->_update_selection( $event->x, $event->y );
}
return FALSE;
}
sub cursor_type_at_point { ## no critic (ProhibitExcessComplexity);
my ( $self, $x, $y ) = @_;
if ( $self->{dragging} ) {
return $self->{dragging};
}
my $selection = $self->view->get_selection;
if ( !defined $selection ) {
return 'crosshair';
}
my $edge_width = $EDGE_WIDTH * $self->view->get('scale-factor');
my ( $sx1, $sy1 ) =
$self->view->to_widget_coords( $selection->{x}, $selection->{y} );
my ( $sx2, $sy2 ) = $self->view->to_widget_coords(
$selection->{x} + $selection->{width},
$selection->{y} + $selection->{height}
);
if ( $x < $sx1 - $edge_width
|| $x > $sx2 + $edge_width
|| $y < $sy1 - $edge_width
|| $y > $sy2 + $edge_width )
{
return 'crosshair';
}
if ( $x > $sx1 + $edge_width
&& $x < $sx2 - $edge_width
&& $y > $sy1 + $edge_width
&& $y < $sy2 - $edge_width )
{
return 'grab';
}
# This makes it possible for the selection to be smaller than edge_width and still be resizeable in all directions
my $leftish = $x < ( $sx1 + $sx2 ) / 2;
my $topish = $y < ( $sy1 + $sy2 ) / 2;
if ( $y > $sy1 + $edge_width && $y < $sy2 - $edge_width ) {
if ($leftish) {
return 'w-resize';
}
else {
return 'e-resize';
}
}
if ( $x > $sx1 + $edge_width && $x < $sx2 - $edge_width ) {
if ($topish) {
return 'n-resize';
}
else {
return 's-resize';
}
}
if ($leftish) {
if ($topish) {
return 'nw-resize';
}
else {
return 'sw-resize';
}
}
else {
if ($topish) {
return 'ne-resize';
}
else {
return 'se-resize';
}
}
}
sub _update_selection {
my ( $self, $x, $y ) = @_;
my $selection = $self->view->get('selection-float') // {
x => 0,
y => 0,
width => 0,
height => 0,
};
my ( $sel_x1, $sel_y1 ) =
$self->view->to_widget_coords( $selection->{x}, $selection->{y} );
my ( $sel_x2, $sel_y2 ) = $self->view->to_widget_coords(
$selection->{x} + $selection->{width},
$selection->{y} + $selection->{height}
);
my $type = $self->{dragging};
if ( $type eq 'grabbing' ) {
my $off_x = $x - $self->{drag_start_x};
my $off_y = $y - $self->{drag_start_y};
$sel_x1 += $off_x;
$sel_x2 += $off_x;
$sel_y1 += $off_y;
$sel_y2 += $off_y;
$self->{drag_start_x} = $x;
$self->{drag_start_y} = $y;
}
if ( $type eq 'crosshair' ) {
$sel_x1 = $x;
$sel_x2 = $x;
$sel_y1 = $y;
$sel_y2 = $y;
$type = 'se-resize';
}
my $flip_we = 0;
my $flip_ns = 0;
if ( $type =~ /w-resize/smx ) {
$sel_x1 = $x;
if ( $x > $sel_x2 ) { $flip_we = 'e' }
}
if ( $type =~ /e-resize/smx ) {
$sel_x2 = $x;
if ( $x < $sel_x1 ) { $flip_we = 'w' }
}
if ( $type =~ /n.?-resize/smx ) {
$sel_y1 = $y;
if ( $y > $sel_y2 ) { $flip_ns = 's' }
}
if ( $type =~ /s.?-resize/smx ) {
$sel_y2 = $y;
if ( $y < $sel_y1 ) { $flip_ns = 'n' }
}
my ( $w, $h ) = $self->view->to_image_distance( abs( $sel_x2 - $sel_x1 ),
abs( $sel_y2 - $sel_y1 ) );
my ( $img_x, $img_y ) =
$self->view->to_image_coords( min( $sel_x1, $sel_x2 ),
min( $sel_y1, $sel_y2 ) );
$self->view->set_selection(
{
x => $img_x,
y => $img_y,
width => $w,
height => $h,
}
);
# Prepare for next mouse event
# If we are dragging, a corner cursor must stay as a corner cursor,
# a left/right cursor must stay as left/right,
# and a top/bottom cursor must stay as top/bottom
if ($flip_we) {
$type =~ s/[we]-/$flip_we-/smx;
}
if ($flip_ns) {
$type =~ s/^[ns]/$flip_ns/smx;
}
$self->{dragging} = $type;
$self->view->update_cursor( $x, $y );
return;
}
# compatibility layer
sub get_selection {
my $self = shift;
return $self->view->get_selection;
}
sub set_selection {
my ( $self, @args ) = @_;
$self->view->set_selection(@args);
return;
}
1;
|
