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# You may distribute under the terms of either the GNU General Public License |
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# or the Artistic License (the same terms as Perl itself) |
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# |
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# (C) Paul Evans, 2012-2014 -- leonerd@leonerd.org.uk |
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package Tickit::Widget::Button; |
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use strict; |
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use warnings; |
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use feature qw( switch ); |
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no if $] >= 5.017011, warnings => 'experimental::smartmatch'; |
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use base qw( Tickit::Widget ); |
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use Tickit::Style; |
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use Tickit::RenderBuffer qw( LINE_SINGLE LINE_DOUBLE LINE_THICK ); |
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our $VERSION = '0.26'; |
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use Tickit::Utils qw( textwidth ); |
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use constant CAN_FOCUS => 1; |
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=head1 NAME |
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C - a widget displaying a clickable button |
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=head1 SYNOPSIS |
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use Tickit; |
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use Tickit::Widget::Button; |
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my $button = Tickit::Widget::Button->new( |
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label => "Click Me!", |
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on_click => sub { |
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my ( $self ) = @_; |
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# Do something! |
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}, |
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); |
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Tickit->new( root => $button )->run; |
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=head1 DESCRIPTION |
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This class provides a widget which displays a clickable area with a label. |
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When the area is clicked, a callback is invoked. |
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=head1 STYLE |
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The default style pen is used as the widget pen. The following style keys are |
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used: |
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=over 4 |
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=item linetype => STRING |
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What kind of border to draw around the button; one of |
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none single double thick |
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=item marker_left => STRING |
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A two-character string to place just before the button label |
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=item marker_right => STRING |
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A two-character string to place just after the button label |
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=back |
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The following style tags are used: |
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=over 4 |
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=item :active |
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Set when the mouse is being held over the button, before it is released |
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=back |
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The following style actions are used: |
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=over 4 |
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=item click |
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The main action to activate the C handler. |
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=back |
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=cut |
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style_definition base => |
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fg => "black", |
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bg => "blue", |
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linetype => "single", |
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marker_left => "> ", |
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marker_right => " <", |
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'' => "click"; |
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style_definition ':focus' => |
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marker_left => ">>", |
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marker_right => "<<"; |
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style_definition ':active' => |
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rv => 1; |
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style_reshape_keys qw( linetype ); |
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style_redraw_keys qw( marker_left marker_right ); |
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use constant WIDGET_PEN_FROM_STYLE => 1; |
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use constant KEYPRESSES_FROM_STYLE => 1; |
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=head1 CONSTRUCTOR |
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=cut |
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=head2 $entry = Tickit::Widget::Button->new( %args ) |
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Constructs a new C object. |
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Takes the following named arguments: |
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=over 8 |
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=item label => STR |
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Text to display in the button area |
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=item on_click => CODE |
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Optional. Callback function to invoke when the button is clicked. |
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=back |
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=cut |
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sub new |
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{ |
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my $class = shift; |
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my %params = @_; |
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my $self = $class->SUPER::new( %params ); |
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$self->set_label( $params{label} ) if defined $params{label}; |
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$self->set_on_click( $params{on_click} ) if $params{on_click}; |
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$self->set_align ( $params{align} // 0.5 ); |
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$self->set_valign( $params{valign} // 0.5 ); |
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return $self; |
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} |
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sub lines |
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{ |
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my $self = shift; |
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my $has_border = ( $self->get_style_values( "linetype" ) ) ne "none"; |
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return 1 + 2*$has_border; |
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} |
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sub cols |
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{ |
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my $self = shift; |
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my $has_border = ( $self->get_style_values( "linetype" ) ) ne "none"; |
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return 4 + textwidth( $self->label ) + 2*$has_border; |
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} |
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=head1 ACCESSORS |
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=cut |
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=head2 $label = $button->label |
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=cut |
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sub label |
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{ |
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return shift->{label} |
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} |
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=head2 $button->set_label( $label ) |
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Return or set the text to display in the button area. |
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=cut |
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sub set_label |
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{ |
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my $self = shift; |
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( $self->{label} ) = @_; |
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$self->redraw; |
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} |
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=head2 $on_click = $button->on_click |
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=cut |
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sub on_click |
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{ |
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my $self = shift; |
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return $self->{on_click}; |
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} |
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=head2 $button->set_on_click( $on_click ) |
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Return or set the CODE reference to be called when the button area is clicked. |
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$on_click->( $button ) |
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=cut |
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sub set_on_click |
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{ |
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my $self = shift; |
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( $self->{on_click} ) = @_; |
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} |
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=head2 $button->click |
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Behave as if the button has been clicked; running its C handler. |
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This is provided for convenience of activating its handler programatically via |
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other parts of code. |
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=cut |
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sub click |
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{ |
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my $self = shift; |
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$self->{on_click}->( $self ); |
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} |
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232
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# Activation by key should "flash" the button briefly on the screen as a |
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# visual feedback |
234
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sub key_click |
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{ |
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my $self = shift; |
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$self->click; |
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if( my $window = $self->window ) { |
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$self->set_style_tag( active => 1 ); |
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$window->tickit->timer( after => 0.1, sub { $self->set_style_tag( active => 0 ) } ); |
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} |
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return 1; |
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} |
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sub _activate |
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{ |
247
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my $self = shift; |
248
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my ( $active ) = @_; |
249
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$self->{active} = $active; |
250
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$self->set_style_tag( active => $active ); |
251
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} |
252
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253
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=head2 $align = $button->align |
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255
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=head2 $button->set_align( $align ) |
256
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257
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=head2 $valign = $button->valign |
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259
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=head2 $button->set_valign( $valign ) |
260
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261
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Accessors for the horizontal and vertical alignment of the label text within |
262
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the button area. See also L. |
263
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264
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=cut |
265
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266
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use Tickit::WidgetRole::Alignable name => "align", style => "h"; |
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use Tickit::WidgetRole::Alignable name => "valign", style => "v"; |
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269
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sub reshape |
270
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{ |
271
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my $self = shift; |
272
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273
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my $win = $self->window or return; |
274
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my $lines = $win->lines; |
275
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my $cols = $win->cols; |
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277
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my $width = textwidth $self->label; |
278
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279
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my $has_border = ( $self->get_style_values( "linetype" ) ) ne "none"; |
280
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281
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my ( $lines_before, undef, $lines_after ) = $self->_valign_allocation( 1, $lines - (2 * $has_border) ); |
282
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my ( $cols_before, undef, $cols_after ) = $self->_align_allocation( $width + 2, $cols - 2 ); |
283
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284
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$self->{label_line} = $lines_before + $has_border; |
285
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$self->{label_col} = $cols_before + 2; |
286
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$self->{label_end} = $cols_before + $width + 2; |
287
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288
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$win->cursor_at( $self->{label_line}, $self->{label_col} ); |
289
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} |
290
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291
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sub render_to_rb |
292
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{ |
293
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my $self = shift; |
294
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my ( $rb, $rect ) = @_; |
295
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296
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my $win = $self->window or return; |
297
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my $lines = $win->lines; |
298
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my $cols = $win->cols; |
299
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300
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my ( $linetype, $marker_left, $marker_right ) = |
301
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$self->get_style_values(qw( linetype marker_left marker_right )); |
302
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303
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my $linestyle = $linetype eq "single" ? LINE_SINGLE : |
304
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$linetype eq "double" ? LINE_DOUBLE : |
305
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$linetype eq "thick" ? LINE_THICK : |
306
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undef; |
307
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308
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if( defined $linestyle ) { |
309
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$rb->hline_at( 0, 0, $cols-1, $linestyle ); |
310
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$rb->hline_at( $lines-1, 0, $cols-1, $linestyle ); |
311
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$rb->vline_at( 0, $lines-1, 0, $linestyle ); |
312
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$rb->vline_at( 0, $lines-1, $cols-1, $linestyle ); |
313
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314
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foreach my $line ( $rect->linerange( 1, $lines-2 ) ) { |
315
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$rb->erase_at( $line, 1, $cols-2 ); |
316
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} |
317
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} |
318
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else { |
319
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foreach my $line ( $rect->linerange( 0, $lines-1 ) ) { |
320
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$rb->erase_at( $line, 0, $cols ); |
321
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} |
322
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} |
323
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324
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$rb->text_at( $self->{label_line}, $self->{label_col} - 2, $marker_left ); |
325
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$rb->text_at( $self->{label_line}, $self->{label_end}, $marker_right ); |
326
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327
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$rb->text_at( $self->{label_line}, $self->{label_col}, $self->label ); |
328
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} |
329
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330
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sub on_mouse |
331
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{ |
332
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my $self = shift; |
333
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my ( $args ) = @_; |
334
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335
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my $type = $args->type; |
336
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my $button = $args->button; |
337
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338
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return unless $button == 1; |
339
|
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340
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for( $type ) { |
341
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when( "press" ) { |
342
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$self->_activate( 1 ); |
343
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|
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} |
344
|
|
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|
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|
when( "drag_start" ) { |
345
|
|
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|
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|
|
$self->{dragging_on_self} = 1; |
346
|
|
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} |
347
|
|
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|
when( "drag_stop" ) { |
348
|
|
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|
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|
|
$self->{dragging_on_self} = 0; |
349
|
|
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|
} |
350
|
|
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|
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|
|
when( "drag" ) { |
351
|
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|
# TODO: This could be neater with an $arg->srcwin |
352
|
|
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|
$self->_activate( 1 ) if $self->{dragging_on_self} and !$self->{active}; |
353
|
|
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|
} |
354
|
|
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|
when( "drag_outside" ) { |
355
|
|
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|
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|
|
$self->_activate( 0 ) if $self->{active}; |
356
|
|
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|
} |
357
|
|
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|
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|
|
when( "release" ) { |
358
|
|
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|
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|
|
if( $self->{active} ) { |
359
|
|
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|
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|
|
$self->_activate( 0 ); |
360
|
|
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|
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|
|
$self->click; |
361
|
|
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|
|
} |
362
|
|
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|
|
} |
363
|
|
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|
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|
|
} |
364
|
|
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|
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|
|
365
|
|
|
|
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|
|
return 1; |
366
|
|
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|
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|
|
} |
367
|
|
|
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|
|
|
368
|
|
|
|
|
|
|
=head1 AUTHOR |
369
|
|
|
|
|
|
|
|
370
|
|
|
|
|
|
|
Paul Evans |
371
|
|
|
|
|
|
|
|
372
|
|
|
|
|
|
|
=cut |
373
|
|
|
|
|
|
|
|
374
|
|
|
|
|
|
|
0x55AA; |