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/* Copyright 2016 Software Freedom Conservancy Inc.
*
* This software is licensed under the GNU LGPL (version 2.1 or later).
* See the COPYING file in this distribution.
*/
class SlideshowPage : SinglePhotoPage {
private const int READAHEAD_COUNT = 5;
private const int CHECK_ADVANCE_MSEC = 250;
private SourceCollection sources;
private ViewCollection controller;
private Photo current;
private Gtk.ToolButton play_pause_button;
private Gtk.ToolButton settings_button;
private PixbufCache cache = null;
private Timer timer = new Timer();
private bool playing = true;
private bool exiting = false;
private string[] transitions;
private Screensaver screensaver;
public signal void hide_toolbar();
[GtkTemplate (ui = "/org/gnome/Shotwell/ui/slideshow_settings.ui")]
private class SettingsDialog : Gtk.Dialog {
[GtkChild]
Gtk.Adjustment delay_adjustment;
[GtkChild]
Gtk.SpinButton delay_entry;
[GtkChild]
Gtk.ComboBoxText transition_effect_selector;
[GtkChild]
Gtk.Scale transition_effect_hscale;
[GtkChild]
Gtk.SpinButton transition_effect_entry;
[GtkChild]
Gtk.Adjustment transition_effect_adjustment;
[GtkChild]
Gtk.CheckButton show_title_button;
public SettingsDialog() {
double delay = Config.Facade.get_instance().get_slideshow_delay();
set_transient_for(AppWindow.get_fullscreen());
delay_adjustment.value = delay;
// get last effect id
string effect_id = Config.Facade.get_instance().get_slideshow_transition_effect_id();
// null effect first, always, and set active in case no other one is found
string null_display_name = TransitionEffectsManager.get_instance().get_effect_name(
TransitionEffectsManager.NULL_EFFECT_ID);
transition_effect_selector.append_text(null_display_name);
transition_effect_selector.set_active(0);
int i = 1;
foreach (string display_name in
TransitionEffectsManager.get_instance().get_effect_names(utf8_ci_compare)) {
if (display_name == null_display_name)
continue;
transition_effect_selector.append_text(display_name);
if (effect_id == TransitionEffectsManager.get_instance().get_id_for_effect_name(display_name))
transition_effect_selector.set_active(i);
++i;
}
transition_effect_selector.changed.connect(on_transition_changed);
double transition_delay = Config.Facade.get_instance().get_slideshow_transition_delay();
transition_effect_adjustment.value = transition_delay;
bool show_title = Config.Facade.get_instance().get_slideshow_show_title();
show_title_button.active = show_title;
on_transition_changed();
}
private void on_transition_changed() {
string selected = transition_effect_selector.get_active_text();
bool sensitive = selected != null
&& selected != TransitionEffectsManager.NULL_EFFECT_ID;
transition_effect_hscale.sensitive = sensitive;
transition_effect_entry.sensitive = sensitive;
}
public double get_delay() {
return delay_entry.get_value();
}
public double get_transition_delay() {
return transition_effect_entry.get_value();
}
public string get_transition_effect_id() {
string? active = transition_effect_selector.get_active_text();
if (active == null)
return TransitionEffectsManager.NULL_EFFECT_ID;
string? id = TransitionEffectsManager.get_instance().get_id_for_effect_name(active);
return (id != null) ? id : TransitionEffectsManager.NULL_EFFECT_ID;
}
public bool get_show_title() {
return show_title_button.active;
}
}
public SlideshowPage(SourceCollection sources, ViewCollection controller, Photo start) {
base(_("Slideshow"), true);
this.sources = sources;
this.controller = controller;
Gee.Collection<string> pluggables = TransitionEffectsManager.get_instance().get_effect_ids();
Gee.ArrayList<string> a = new Gee.ArrayList<string>();
a.add_all(pluggables);
a.remove(NullTransitionDescriptor.EFFECT_ID);
a.remove(RandomEffectDescriptor.EFFECT_ID);
transitions = a.to_array();
current = start;
update_transition_effect();
// Set up toolbar
Gtk.Toolbar toolbar = get_toolbar();
// add toolbar buttons
Gtk.ToolButton previous_button = new Gtk.ToolButton(null, _("Back"));
previous_button.set_icon_name("go-previous");
previous_button.set_tooltip_text(_("Go to the previous photo"));
previous_button.clicked.connect(on_previous_photo);
toolbar.insert(previous_button, -1);
play_pause_button = new Gtk.ToolButton(null, _("Pause"));
play_pause_button.set_icon_name("media-playback-pause");
play_pause_button.set_tooltip_text(_("Pause the slideshow"));
play_pause_button.clicked.connect(on_play_pause);
toolbar.insert(play_pause_button, -1);
Gtk.ToolButton next_button = new Gtk.ToolButton(null, _("Next"));
next_button.set_icon_name("go-next");
next_button.set_tooltip_text(_("Go to the next photo"));
next_button.clicked.connect(on_next_photo);
toolbar.insert(next_button, -1);
settings_button = new Gtk.ToolButton(null, null);
settings_button.set_icon_name("preferences-system");
settings_button.set_label(_("Settings"));
settings_button.set_tooltip_text(_("Change slideshow settings"));
settings_button.clicked.connect(on_change_settings);
settings_button.is_important = true;
toolbar.insert(settings_button, -1);
screensaver = new Screensaver();
}
public override void switched_to() {
base.switched_to();
// create a cache for the size of this display
cache = new PixbufCache(sources, PixbufCache.PhotoType.BASELINE, get_canvas_scaling(),
READAHEAD_COUNT);
Gdk.Pixbuf pixbuf;
if (get_next_photo(current, Direction.FORWARD, out current, out pixbuf))
set_pixbuf(pixbuf, current.get_dimensions(), Direction.FORWARD);
// start the auto-advance timer
Timeout.add(CHECK_ADVANCE_MSEC, auto_advance);
timer.start();
screensaver.inhibit("Playing slideshow");
}
public override void switching_from() {
base.switching_from();
screensaver.uninhibit();
exiting = true;
}
private bool get_next_photo(Photo start, Direction direction, out Photo next,
out Gdk.Pixbuf next_pixbuf) {
next = start;
for (;;) {
try {
// Fails if a photo source file is missing.
next_pixbuf = cache.fetch(next);
} catch (Error err) {
warning("Unable to fetch pixbuf for %s: %s", next.to_string(), err.message);
// Look for the next good photo
DataView view = controller.get_view_for_source(next);
view = (direction == Direction.FORWARD)
? controller.get_next(view)
: controller.get_previous(view);
next = (Photo) view.get_source();
// An entire slideshow set might be missing, so check for a loop.
if ((next == start && next != current) || next == current) {
AppWindow.error_message(_("All photo source files are missing."), get_container());
AppWindow.get_instance().end_fullscreen();
next = null;
next_pixbuf = null;
return false;
}
continue;
}
// prefetch this photo's extended neighbors: the next photo highest priority, the prior
// one normal, and the extended neighbors lowest, to recognize immediate needs
DataSource forward, back;
controller.get_immediate_neighbors(next, out forward, out back, Photo.TYPENAME);
cache.prefetch((Photo) forward, BackgroundJob.JobPriority.HIGHEST);
cache.prefetch((Photo) back, BackgroundJob.JobPriority.NORMAL);
Gee.Set<DataSource> neighbors = controller.get_extended_neighbors(next, Photo.TYPENAME);
neighbors.remove(forward);
neighbors.remove(back);
cache.prefetch_many((Gee.Collection<Photo>) neighbors, BackgroundJob.JobPriority.LOWEST);
return true;
}
}
private void on_play_pause() {
if (playing) {
play_pause_button.set_icon_name("media-playback-start");
play_pause_button.set_label(_("Play"));
play_pause_button.set_tooltip_text(_("Continue the slideshow"));
} else {
play_pause_button.set_icon_name("media-playback-pause");
play_pause_button.set_label(_("Pause"));
play_pause_button.set_tooltip_text(_("Pause the slideshow"));
}
playing = !playing;
// reset the timer
timer.start();
}
protected override void on_previous_photo() {
DataView view = controller.get_view_for_source(current);
Photo? prev_photo = null;
DataView? start_view = controller.get_previous(view);
DataView? prev_view = start_view;
while (prev_view != null) {
if (prev_view.get_source() is Photo) {
prev_photo = (Photo) prev_view.get_source();
break;
}
prev_view = controller.get_previous(prev_view);
if (prev_view == start_view) {
warning("on_previous( ): can't advance to previous photo: collection has only videos");
return;
}
}
advance(prev_photo, Direction.BACKWARD);
}
protected override void on_next_photo() {
DataView view = controller.get_view_for_source(current);
Photo? next_photo = null;
DataView? start_view = controller.get_next(view);
DataView? next_view = start_view;
while (next_view != null) {
if (next_view.get_source() is Photo) {
next_photo = (Photo) next_view.get_source();
break;
}
next_view = controller.get_next(next_view);
if (next_view == start_view) {
warning("on_next( ): can't advance to next photo: collection has only videos");
return;
}
}
if (Config.Facade.get_instance().get_slideshow_transition_effect_id() ==
RandomEffectDescriptor.EFFECT_ID) {
random_transition_effect();
}
advance(next_photo, Direction.FORWARD);
}
private void advance(Photo photo, Direction direction) {
current = photo;
// set pixbuf
Gdk.Pixbuf next_pixbuf;
if (get_next_photo(current, direction, out current, out next_pixbuf))
set_pixbuf(next_pixbuf, current.get_dimensions(), direction);
// reset the advance timer
timer.start();
}
private bool auto_advance() {
if (exiting)
return false;
if (!playing)
return true;
if (timer.elapsed() < Config.Facade.get_instance().get_slideshow_delay())
return true;
on_next_photo();
return true;
}
public override bool key_press_event(Gdk.EventKey event) {
bool handled = true;
switch (Gdk.keyval_name(event.keyval)) {
case "space":
on_play_pause();
break;
default:
handled = false;
break;
}
if (handled)
return true;
return (base.key_press_event != null) ? base.key_press_event(event) : true;
}
private void on_change_settings() {
SettingsDialog settings_dialog = new SettingsDialog();
settings_dialog.show_all();
bool slideshow_playing = playing;
playing = false;
hide_toolbar();
if (settings_dialog.run() == Gtk.ResponseType.OK) {
// sync with the config setting so it will persist
Config.Facade.get_instance().set_slideshow_delay(settings_dialog.get_delay());
Config.Facade.get_instance().set_slideshow_transition_delay(settings_dialog.get_transition_delay());
Config.Facade.get_instance().set_slideshow_transition_effect_id(settings_dialog.get_transition_effect_id());
Config.Facade.get_instance().set_slideshow_show_title(settings_dialog.get_show_title());
update_transition_effect();
}
settings_dialog.destroy();
playing = slideshow_playing;
timer.start();
}
private void update_transition_effect() {
string effect_id = Config.Facade.get_instance().get_slideshow_transition_effect_id();
double effect_delay = Config.Facade.get_instance().get_slideshow_transition_delay();
set_transition(effect_id, (int) (effect_delay * 1000.0));
}
private void random_transition_effect() {
double effect_delay = Config.Facade.get_instance().get_slideshow_transition_delay();
string effect_id = TransitionEffectsManager.NULL_EFFECT_ID;
if (0 < transitions.length) {
int random = Random.int_range(0, transitions.length);
effect_id = transitions[random];
}
set_transition(effect_id, (int) (effect_delay * 1000.0));
}
// Paint the title of the photo
private void paint_title(Cairo.Context ctx, Dimensions ctx_dim) {
string? title = current.get_title();
// If the photo doesn't have a title, don't paint anything
if (title == null || title == "")
return;
Pango.Layout layout = create_pango_layout(title);
Pango.AttrList list = new Pango.AttrList();
Pango.Attribute size = Pango.attr_scale_new(3);
list.insert(size.copy());
layout.set_attributes(list);
layout.set_width((int) ((ctx_dim.width * 0.9) * Pango.SCALE));
// Find the right position
int title_width, title_height;
layout.get_pixel_size(out title_width, out title_height);
double x = ctx_dim.width * 0.2;
double y = ctx_dim.height * 0.90;
// Move the title up if it is too high
if (y + title_height >= ctx_dim.height * 0.95)
y = ctx_dim.height * 0.95 - title_height;
// Move to the left if the title is too long
if (x + title_width >= ctx_dim.width * 0.95)
x = ctx_dim.width / 2 - title_width / 2;
set_source_color_from_string(ctx, "#fff");
ctx.move_to(x, y);
Pango.cairo_show_layout(ctx, layout);
Pango.cairo_layout_path(ctx, layout);
ctx.set_line_width(1.5);
set_source_color_from_string(ctx, "#000");
ctx.stroke();
}
public override void paint(Cairo.Context ctx, Dimensions ctx_dim) {
base.paint(ctx, ctx_dim);
if (Config.Facade.get_instance().get_slideshow_show_title() && !is_transition_in_progress())
paint_title(ctx, ctx_dim);
}
}
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