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presenter.vala
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/**
* Presentater window
*
* This file is part of pdf-presenter-console.
*
* Copyright (C) 2010-2011 Jakob Westhoff <jakob@westhoffswelt.de>
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
using Gtk;
using Gdk;
using org.westhoffswelt.pdfpresenter;
namespace org.westhoffswelt.pdfpresenter.Window {
/**
* Window showing the currently active and next slide.
*
* Other useful information like time slide count, ... can be displayed here as
* well.
*/
public class Presenter: Fullscreen, Controllable {
/**
* Controller handling all the events which might happen. Furthermore it is
* responsible to update all the needed visual stuff if needed
*/
protected PresentationController presentation_controller = null;
/**
* View showing the current slide
*/
protected View.Base current_view;
/**
* View showing a preview of the next slide
*/
protected View.Base next_view;
/**
* Small views for (non-user) next slides
*/
protected View.Base strict_next_view;
protected View.Base strict_prev_view;
/**
* Timer for the presenation
*/
protected TimerLabel? timer;
/**
* Slide progress label ( eg. "23/42" )
*/
protected Entry slide_progress;
protected ProgressBar prerender_progress;
/**
* Indication that the slide is blanked (faded to black)
*/
protected Gtk.Image blank_icon;
/**
* Indication that the presentation display is frozen
*/
protected Gtk.Image frozen_icon;
/**
* Indication that the timer is paused
*/
protected Gtk.Image pause_icon;
/**
* Text box for displaying notes for the slides
*/
protected TextView notes_view;
/**
* Layout to position all the elements inside the window
*/
protected VBox fullLayout = null;
protected HBox slideViews = null;
protected Overview overview = null;
protected Alignment centered_overview = null;
protected bool overview_added = false;
/**
* Number of slides inside the presentation
*
* This value is needed a lot of times therefore it is retrieved once
* and stored here for performance and readability reasons.
*/
protected uint slide_count;
/**
* Metadata of the slides
*/
protected Metadata.Pdf metadata;
/**
* Useful colors
*/
protected Color black;
protected Color white;
/**
* Base constructor instantiating a new presenter window
*/
public Presenter( Metadata.Pdf metadata, int screen_num, PresentationController presentation_controller ) {
base( screen_num );
this.destroy.connect( (source) => {
Gtk.main_quit();
} );
this.presentation_controller = presentation_controller;
this.presentation_controller.register_controllable( this );
this.metadata = metadata;
Color.parse( "black", out this.black );
Color.parse( "white", out this.white );
this.modify_bg( StateType.NORMAL, this.black );
// We need the value of 90% height a lot of times. Therefore store it
// in advance
var bottom_position = (int)Math.floor( this.screen_geometry.height * 0.9 );
var bottom_height = this.screen_geometry.height - bottom_position;
// In most scenarios the current slide is displayed bigger than the
// next one. The option current_size represents the width this view
// should use as a percentage value. The maximal height is 90% of
// the screen, as we need a place to display the timer and slide
// count.
Rectangle current_scale_rect;
int current_allocated_width = (int)Math.floor(
this.screen_geometry.width * Options.current_size / (double)100
);
this.current_view = View.Pdf.from_metadata(
metadata,
current_allocated_width,
(int)Math.floor(0.8*bottom_position),
Options.black_on_end,
this.presentation_controller,
out current_scale_rect
);
// The next slide is right to the current one and takes up the
// remaining width
//Requisition cv_requisition;
//this.current_view.size_request(out cv_requisition);
//current_allocated_width = cv_requisition.width;
Rectangle next_scale_rect;
var next_allocated_width = this.screen_geometry.width - current_allocated_width-4; // We leave a bit of margin between the two views
this.next_view = View.Pdf.from_metadata(
metadata,
next_allocated_width,
(int)Math.floor(0.7*bottom_position),
true,
this.presentation_controller,
out next_scale_rect
);
this.strict_next_view = View.Pdf.from_metadata(
metadata,
(int)Math.floor(0.5*current_allocated_width),
(int)Math.floor(0.19*bottom_position) - 2,
true,
this.presentation_controller,
out next_scale_rect
);
this.strict_prev_view = View.Pdf.from_metadata(
metadata,
(int)Math.floor(0.5*current_allocated_width),
(int)Math.floor(0.19*bottom_position) - 2,
true,
this.presentation_controller,
out next_scale_rect
);
// TextView for notes in the slides
var notes_font = Pango.FontDescription.from_string( "Verdana" );
notes_font.set_size(
(int)Math.floor( 20 * 0.75 ) * Pango.SCALE
);
this.notes_view = new TextView();
this.notes_view.editable = false;
this.notes_view.cursor_visible = false;
this.notes_view.wrap_mode = WrapMode.WORD;
this.notes_view.modify_font(notes_font);
this.notes_view.modify_base(StateType.NORMAL, black);
this.notes_view.modify_text(StateType.NORMAL, white);
this.notes_view.buffer.text = "";
this.notes_view.key_press_event.connect( this.on_key_press_notes_view );
// Initial font needed for the labels
// We approximate the point size using pt = px * .75
var font = Pango.FontDescription.from_string( "Verdana" );
font.set_size(
(int)Math.floor( bottom_height * 0.8 * 0.75 ) * Pango.SCALE
);
// The countdown timer is centered in the 90% bottom part of the screen
// It takes 3/4 of the available width
this.timer = this.presentation_controller.getTimer();
this.timer.set_justify( Justification.CENTER );
this.timer.modify_font( font );
// The slide counter is centered in the 90% bottom part of the screen
// It takes 1/4 of the available width on the right
this.slide_progress = new Entry();
this.slide_progress.set_alignment(1f);
this.slide_progress.modify_base(StateType.NORMAL, this.black);
this.slide_progress.modify_text(StateType.NORMAL, this.white);
this.slide_progress.modify_font( font );
this.slide_progress.editable = false;
this.slide_progress.has_frame = false;
this.slide_progress.key_press_event.connect( this.on_key_press_slide_progress );
this.slide_progress.inner_border = new Border();
this.prerender_progress = new ProgressBar();
this.prerender_progress.text = "Prerendering...";
this.prerender_progress.modify_font( notes_font );
this.prerender_progress.modify_bg( StateType.NORMAL, this.black );
this.prerender_progress.modify_bg( StateType.PRELIGHT, this.white );
this.prerender_progress.modify_fg( StateType.NORMAL, this.white );
this.prerender_progress.modify_fg( StateType.PRELIGHT, this.black );
this.prerender_progress.no_show_all = true;
try {
int icon_height = bottom_height - 10;
var blank_pixbuf = Rsvg.pixbuf_from_file_at_size(icon_path + "blank.svg", (int)Math.floor(1.06*icon_height), icon_height);
this.blank_icon = new Gtk.Image.from_pixbuf(blank_pixbuf);
this.blank_icon.no_show_all = true;
var frozen_pixbuf = Rsvg.pixbuf_from_file_at_size(icon_path + "snow.svg", icon_height, icon_height);
this.frozen_icon = new Gtk.Image.from_pixbuf(frozen_pixbuf);
this.frozen_icon.no_show_all = true;
var pause_pixbuf = Rsvg.pixbuf_from_file_at_size(icon_path + "pause.svg", icon_height, icon_height);
this.pause_icon = new Gtk.Image.from_pixbuf(pause_pixbuf);
this.pause_icon.no_show_all = true;
} catch (Error e) {
error("%s", e.message);
}
this.add_events(EventMask.KEY_PRESS_MASK);
this.add_events(EventMask.BUTTON_PRESS_MASK);
this.add_events(EventMask.SCROLL_MASK);
this.key_press_event.connect( this.on_key_pressed );
this.button_press_event.connect( this.on_button_press );
this.scroll_event.connect( this.on_scroll );
// Store the slide count once
this.slide_count = metadata.get_slide_count();
// Enable the render caching if it hasn't been forcefully disabled.
if ( !Options.disable_caching ) {
((Renderer.Caching)this.current_view.get_renderer()).set_cache(
Renderer.Cache.OptionFactory.create(
metadata
)
);
((Renderer.Caching)this.next_view.get_renderer()).set_cache(
Renderer.Cache.OptionFactory.create(
metadata
)
);
((Renderer.Caching)this.strict_next_view.get_renderer()).set_cache(
Renderer.Cache.OptionFactory.create(
metadata
)
);
((Renderer.Caching)this.strict_prev_view.get_renderer()).set_cache(
Renderer.Cache.OptionFactory.create(
metadata
)
);
}
this.build_layout();
}
public override void show() {
base.show();
this.overview.set_available_space(this.allocation.width,
(int)Math.floor(this.allocation.height * 0.9));
}
protected void build_layout() {
this.slideViews = new HBox(false, 4);
var strict_views = new HBox(false, 0);
strict_views.pack_start(this.strict_prev_view, false, false, 0);
strict_views.pack_end(this.strict_next_view, false, false, 0);
var center_current_view = new Alignment(0.5f, 0.5f, 0, 0);
center_current_view.add(this.current_view);
var current_view_and_stricts = new VBox(false, 2);
current_view_and_stricts.pack_start(center_current_view, false, false, 2);
current_view_and_stricts.pack_start(strict_views, false, false, 2);
this.slideViews.add( current_view_and_stricts );
var nextViewWithNotes = new VBox(false, 0);
var center_next_view = new Alignment(0.5f, 0.5f, 0, 0);
center_next_view.add(this.next_view);
nextViewWithNotes.pack_start( center_next_view, false, false, 0 );
var notes_sw = new ScrolledWindow(null, null);
Scrollbar notes_scrollbar = (Gtk.Scrollbar) notes_sw.get_vscrollbar();
notes_scrollbar.modify_bg(StateType.NORMAL, white);
notes_scrollbar.modify_bg(StateType.ACTIVE, black);
notes_scrollbar.modify_bg(StateType.PRELIGHT, white);
notes_sw.add( this.notes_view );
notes_sw.set_policy( PolicyType.AUTOMATIC, PolicyType.AUTOMATIC );
nextViewWithNotes.pack_start( notes_sw, true, true, 5 );
this.slideViews.add(nextViewWithNotes);
var bottomRow = new HBox(true, 0);
var status = new HBox(false, 2);
//blank_label_alignment.add( this.blank_label );
status.pack_start( this.blank_icon, false, false, 0 );
status.pack_start( this.frozen_icon, false, false, 0 );
status.pack_start( this.pause_icon, false, false, 0 );
var timer_alignment = new Alignment(0.5f, 0.5f, 0, 0);
timer_alignment.add( this.timer );
var progress_alignment = new HBox(false, 0);
progress_alignment.pack_end(this.slide_progress);
var prerender_alignment = new Alignment(0, 0.5f, 1, 0);
prerender_alignment.add(this.prerender_progress);
progress_alignment.pack_start(prerender_alignment);
bottomRow.pack_start( status, true, true, 0);
bottomRow.pack_start( timer_alignment, true, true, 0 );
bottomRow.pack_end( progress_alignment, true, true, 0);
//var fullLayout = new VBox(false, 0);
this.fullLayout = new VBox(false, 0);
fullLayout.pack_start( this.slideViews, true, true, 0 );
fullLayout.pack_end( bottomRow, false, false, 0 );
this.add( fullLayout );
this.overview = new Overview( this.metadata, this.presentation_controller, this );
this.centered_overview = new Alignment(0.5f, 0.5f, 0, 0);
this.centered_overview.add(this.overview);
//this.centered_overview.no_show_all = true;
this.overview.set_n_slides( this.presentation_controller.get_user_n_slides() );
//this.fullLayout.pack_start( this.overview, true, true, 0 );
this.presentation_controller.set_overview(this.overview);
}
/**
* Handle keypress events on the window and, if neccessary send them to the
* presentation controller
*/
protected bool on_key_pressed( Gtk.Widget source, EventKey key ) {
if ( this.presentation_controller != null ) {
return this.presentation_controller.key_press( key );
} else {
// Can this happen?
return false;
}
}
/**
* Handle mouse button events on the window and, if neccessary send
* them to the presentation controller
*/
protected bool on_button_press( Gtk.Widget source, EventButton button ) {
if ( this.presentation_controller != null ) {
this.presentation_controller.button_press( button );
}
return false;
}
/**
* Handle mouse scrolling events on the window and, if neccessary send
* them to the presentation controller
*/
protected bool on_scroll( Gtk.Widget source, EventScroll scroll ) {
if ( this.presentation_controller != null ) {
this.presentation_controller.scroll( scroll );
}
return false;
}
/**
* Update the slide count view
*/
protected void update_slide_count() {
this.custom_slide_count(
this.presentation_controller.get_current_user_slide_number() + 1
);
}
public void custom_slide_count(int current) {
int total = this.presentation_controller.get_end_user_slide();
this.slide_progress.set_text( "%d/%u".printf(current, total) );
}
/**
* Return the registered PresentationController
*/
public PresentationController? get_controller() {
return this.presentation_controller;
}
public void update() {
if (this.overview != null) {
this.centered_overview.hide();
this.slideViews.show();
}
int current_slide_number = this.presentation_controller.get_current_slide_number();
int current_user_slide_number = this.presentation_controller.get_current_user_slide_number();
try {
this.current_view.display(current_slide_number);
this.next_view.display(this.metadata.user_slide_to_real_slide(current_user_slide_number + 1));
if (this.presentation_controller.skip_next()) {
this.strict_next_view.display(current_slide_number + 1, true);
} else {
this.strict_next_view.fade_to_black();
}
if (this.presentation_controller.skip_previous()) {
this.strict_prev_view.display(current_slide_number - 1, true);
} else {
this.strict_prev_view.fade_to_black();
}
}
catch( Renderer.RenderError e ) {
GLib.error( "The pdf page %d could not be rendered: %s", current_slide_number, e.message );
}
this.update_slide_count();
this.update_note();
if (this.timer.is_paused())
this.pause_icon.show();
else
this.pause_icon.hide();
if (this.presentation_controller.is_faded_to_black())
this.blank_icon.show();
else
this.blank_icon.hide();
if (this.presentation_controller.is_frozen())
this.frozen_icon.show();
else
this.frozen_icon.hide();
this.faded_to_black = false;
}
/**
* Display a specific page
*/
public void goto_page( int page_number ) {
try {
this.current_view.display( page_number );
this.next_view.display(
page_number + 1
);
}
catch( Renderer.RenderError e ) {
GLib.error( "The pdf page %d could not be rendered: %s", page_number, e.message );
}
this.update_slide_count();
this.update_note();
this.blank_icon.hide();
}
/**
* Ask for the page to jump to
*/
public void ask_goto_page() {
this.slide_progress.set_text("/%u".printf(this.presentation_controller.get_user_n_slides()));
this.slide_progress.modify_cursor(white, null);
this.slide_progress.editable = true;
this.slide_progress.grab_focus();
this.slide_progress.set_position(0);
this.presentation_controller.set_ignore_input_events( true );
}
/**
* Handle key events for the slide_progress entry field
*/
protected bool on_key_press_slide_progress( Gtk.Widget source, EventKey key ) {
if ( key.keyval == 0xff0d ) {
// Try to parse the input
string input_text = this.slide_progress.text;
int destination = int.parse(input_text.substring(0, input_text.index_of("/")));
this.slide_progress.modify_cursor(black, null);
this.slide_progress.editable = false;
this.presentation_controller.set_ignore_input_events( false );
if ( destination != 0 )
this.presentation_controller.goto_user_page(destination);
else
this.update_slide_count(); // Reset the display we had before
return true;
} else {
return false;
}
}
/**
* Edit a note. Basically give focus to notes_view
*/
public void edit_note() {
this.notes_view.editable = true;
this.notes_view.cursor_visible = true;
this.notes_view.grab_focus();
this.presentation_controller.set_ignore_input_events( true );
}
/**
* Handle key presses when editing a note
*/
protected bool on_key_press_notes_view( Gtk.Widget source, EventKey key ) {
if ( key.keyval == 0xff1b) { /* Escape */
this.notes_view.editable = false;
this.notes_view.cursor_visible = false;
this.metadata.get_notes().set_note( this.notes_view.buffer.text, this.presentation_controller.get_current_user_slide_number() );
this.presentation_controller.set_ignore_input_events( false );
return true;
} else {
return false;
}
}
/**
* Update the text of the current note
*/
protected void update_note() {
string this_note = this.metadata.get_notes().get_note_for_slide(this.presentation_controller.get_current_user_slide_number());
this.notes_view.buffer.text = this_note;
}
public void show_overview() {
this.slideViews.hide();
if (!overview_added) {
this.fullLayout.pack_start( this.centered_overview, true, true, 0 );
overview_added = true;
}
this.centered_overview.show();
this.overview.current_slide = this.presentation_controller.get_current_user_slide_number();
}
public void hide_overview() {
this.centered_overview.hide();
this.slideViews.show();
}
/**
* Take a cache observer and register it with all prerendering Views
* shown on the window.
*
* Furthermore it is taken care of to add the cache observer to this window
* for display, as it is a Image widget after all.
*/
public void set_cache_observer( CacheStatus observer ) {
var current_prerendering_view = this.current_view as View.Prerendering;
if( current_prerendering_view != null ) {
observer.monitor_view( current_prerendering_view );
}
var next_prerendering_view = this.next_view as View.Prerendering;
if( next_prerendering_view != null ) {
observer.monitor_view( next_prerendering_view );
}
//observer.register_entry( this.slide_progress );
//observer.register_update( this.prerender_progress.set_fraction, () => this.prerender_progress.hide() );
observer.register_update( this.prerender_progress.set_fraction, this.prerender_finished );
this.prerender_progress.show();
}
public void prerender_finished() {
this.prerender_progress.hide();
this.overview.set_cache(((Renderer.Caching)this.next_view.get_renderer()).get_cache());
}
}
}