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/*
* Copyright (C) 2009-2015 Canonical Ltd.
* Author: Robert Ancell <robert.ancell@canonical.com>
*
* 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 3 of the License, or (at your option) any later
* version. See http://www.gnu.org/copyleft/gpl.html the full text of the
* license.
*/
// FIXME: When scrolling, copy existing render sideways?
// FIXME: Only render pages that change and only the part that changed
public class BookView : Gtk.Box
{
/* Book being rendered */
public Book book { get; private set; }
private HashTable<Page, PageView> page_data;
/* True if the view needs to be laid out again */
private bool need_layout;
private bool laying_out;
private bool show_selected_page;
/* Currently selected page */
private PageView? selected_page_view = null;
public Page? selected_page
{
get
{
if (selected_page_view != null)
return selected_page_view.page;
else
return null;
}
set
{
if (selected_page == value)
return;
if (value != null)
select_page_view (page_data.lookup (value));
else
select_page_view (null);
}
}
/* Widget being rendered to */
private Gtk.Widget drawing_area;
/* Horizontal scrollbar */
private Gtk.Scrollbar scroll;
private Gtk.Adjustment adjustment;
private Gdk.CursorType cursor;
public signal void page_selected (Page? page);
public signal void show_page (Page page);
public signal void show_menu (Gdk.Event event);
public int x_offset
{
get
{
return (int) adjustment.get_value ();
}
set
{
adjustment.value = value;
}
}
public BookView (Book book)
{
GLib.Object (orientation: Gtk.Orientation.VERTICAL);
this.book = book;
/* Load existing pages */
for (var i = 0; i < book.n_pages; i++)
{
Page page = book.get_page (i);
add_cb (book, page);
}
selected_page = book.get_page (0);
/* Watch for new pages */
book.page_added.connect (add_cb);
book.page_removed.connect (remove_cb);
book.reordered.connect (reorder_cb);
book.cleared.connect (clear_cb);
need_layout = true;
page_data = new HashTable<Page, PageView> (direct_hash, direct_equal);
cursor = Gdk.CursorType.ARROW;
drawing_area = new Gtk.DrawingArea ();
drawing_area.set_size_request (200, 100);
drawing_area.can_focus = true;
drawing_area.events = Gdk.EventMask.POINTER_MOTION_MASK | Gdk.EventMask.BUTTON_PRESS_MASK | Gdk.EventMask.BUTTON_RELEASE_MASK | Gdk.EventMask.FOCUS_CHANGE_MASK | Gdk.EventMask.STRUCTURE_MASK | Gdk.EventMask.SCROLL_MASK;
pack_start (drawing_area, true, true, 0);
scroll = new Gtk.Scrollbar (Gtk.Orientation.HORIZONTAL, null);
adjustment = scroll.adjustment;
pack_start (scroll, false, true, 0);
drawing_area.configure_event.connect (configure_cb);
drawing_area.draw.connect (draw_cb);
drawing_area.motion_notify_event.connect (motion_cb);
drawing_area.key_press_event.connect (key_cb);
drawing_area.button_press_event.connect (button_cb);
drawing_area.button_release_event.connect (button_cb);
drawing_area.focus_in_event.connect_after (focus_cb);
drawing_area.focus_out_event.connect_after (focus_cb);
adjustment.value_changed.connect (scroll_cb);
drawing_area.visible = true;
}
~BookView ()
{
book.page_added.disconnect (add_cb);
book.page_removed.disconnect (remove_cb);
book.reordered.disconnect (reorder_cb);
book.cleared.disconnect (clear_cb);
drawing_area.configure_event.disconnect (configure_cb);
drawing_area.draw.disconnect (draw_cb);
drawing_area.motion_notify_event.disconnect (motion_cb);
drawing_area.key_press_event.disconnect (key_cb);
drawing_area.button_press_event.disconnect (button_cb);
drawing_area.button_release_event.disconnect (button_cb);
drawing_area.focus_in_event.disconnect (focus_cb);
drawing_area.focus_out_event.disconnect (focus_cb);
adjustment.value_changed.disconnect (scroll_cb);
}
private PageView get_nth_page (int n)
{
Page page = book.get_page (n);
return page_data.lookup (page);
}
private PageView get_next_page (PageView page)
{
for (var i = 0; ; i++)
{
var p = book.get_page (i);
if (p == null)
break;
if (p == page.page)
{
p = book.get_page (i + 1);
if (p != null)
return page_data.lookup (p);
}
}
return page;
}
private PageView get_prev_page (PageView page)
{
var prev_page = page;
for (var i = 0; ; i++)
{
var p = book.get_page (i);
if (p == null)
break;
if (p == page.page)
return prev_page;
prev_page = page_data.lookup (p);
}
return page;
}
private void page_view_changed_cb (PageView page)
{
redraw ();
}
private void page_view_size_changed_cb (PageView page)
{
need_layout = true;
redraw ();
}
private void add_cb (Book book, Page page)
{
var page_view = new PageView (page);
page_view.changed.connect (page_view_changed_cb);
page_view.size_changed.connect (page_view_size_changed_cb);
page_data.insert (page, page_view);
need_layout = true;
redraw ();
}
private void set_selected_page_view (PageView? page)
{
/* Deselect existing page if changed */
if (selected_page_view != null && page != selected_page_view)
selected_page_view.selected = true;
selected_page_view = page;
if (selected_page_view == null)
return;
/* Select new page if widget has focus */
if (!drawing_area.has_focus)
selected_page_view.selected = false;
else
selected_page_view.selected = true;
}
private void show_page_view (PageView? page)
{
if (page == null || !scroll.get_visible ())
return;
Gtk.Allocation allocation;
drawing_area.get_allocation (out allocation);
var left_edge = page.x_offset;
var right_edge = page.x_offset + page.width;
if (left_edge - x_offset < 0)
x_offset = left_edge;
else if (right_edge - x_offset > allocation.width)
x_offset = right_edge - allocation.width;
}
private void select_page_view (PageView? page)
{
Page? p = null;
if (selected_page_view == page)
return;
set_selected_page_view (page);
if (need_layout)
show_selected_page = true;
else
show_page_view (page);
if (page != null)
p = page.page;
page_selected (p);
}
private void remove_cb (Book book, Page page)
{
PageView new_selection = selected_page_view;
/* Select previous page or next if removing the selected page */
if (page == selected_page)
{
new_selection = get_prev_page (selected_page_view);
if (new_selection == selected_page_view)
new_selection = get_next_page (selected_page_view);
selected_page_view = null;
}
var page_view = page_data.lookup (page);
page_view.changed.disconnect (page_view_changed_cb);
page_view.size_changed.disconnect (page_view_size_changed_cb);
page_data.remove (page);
select_page_view (new_selection);
need_layout = true;
redraw ();
}
private void reorder_cb (Book book)
{
need_layout = true;
redraw ();
}
private void clear_cb (Book book)
{
page_data.remove_all ();
selected_page_view = null;
page_selected (null);
need_layout = true;
redraw ();
}
private bool configure_cb (Gtk.Widget widget, Gdk.EventConfigure event)
{
need_layout = true;
return false;
}
private void layout_into (int width, int height, out int book_width, out int book_height)
{
var pages = new List<PageView> ();
for (var i = 0; i < book.n_pages; i++)
pages.append (get_nth_page (i));
/* Get maximum page resolution */
int max_dpi = 0;
foreach (var page in pages)
{
var p = page.page;
if (p.dpi > max_dpi)
max_dpi = p.dpi;
}
/* Get area required to fit all pages */
int max_width = 0, max_height = 0;
foreach (var page in pages)
{
var p = page.page;
var w = p.width;
var h = p.height;
/* Scale to the same DPI */
w = (int) ((double)w * max_dpi / p.dpi + 0.5);
h = (int) ((double)h * max_dpi / p.dpi + 0.5);
if (w > max_width)
max_width = w;
if (h > max_height)
max_height = h;
}
var aspect = (double)width / height;
var max_aspect = (double)max_width / max_height;
/* Get total dimensions of all pages */
int spacing = 12;
book_width = 0;
book_height = 0;
foreach (var page in pages)
{
var p = page.page;
/* NOTE: Using double to avoid overflow for large images */
if (max_aspect > aspect)
{
/* Set width scaled on DPI and maximum width */
int w = (int) ((double)p.width * max_dpi * width / (p.dpi * max_width));
page.width = w;
}
else
{
/* Set height scaled on DPI and maximum height */
int h = (int) ((double)p.height * max_dpi * height / (p.dpi * max_height));
page.height = h;
}
var h = page.height;
if (h > book_height)
book_height = h;
book_width += page.width + spacing;
}
if (pages != null)
book_width -= spacing;
int x_offset = 0;
foreach (var page in pages)
{
/* Layout pages left to right */
page.x_offset = x_offset;
x_offset += page.width + spacing;
/* Centre page vertically */
page.y_offset = (height - page.height) / 2;
}
}
private void layout ()
{
if (!need_layout)
return;
laying_out = true;
Gtk.Allocation allocation;
drawing_area.get_allocation(out allocation);
Gtk.Allocation box_allocation;
get_allocation(out box_allocation);
/* If scroll is right aligned then keep that after layout */
bool right_aligned = true;
if (adjustment.get_value () < adjustment.get_upper () - adjustment.get_page_size ())
right_aligned = false;
/* Try and fit without scrollbar */
var width = (int) allocation.width;
var height = (int) (box_allocation.height - get_border_width () * 2);
int book_width, book_height;
layout_into (width, height, out book_width, out book_height);
/* Relayout with scrollbar */
if (book_width > allocation.width)
{
/* Re-layout leaving space for scrollbar */
height = allocation.height;
layout_into (width, height, out book_width, out book_height);
/* Set scrollbar limits */
adjustment.lower = 0;
adjustment.upper = book_width;
adjustment.page_size = allocation.width;
/* Keep right-aligned */
var max_offset = book_width - allocation.width;
if (right_aligned || x_offset > max_offset)
x_offset = max_offset;
scroll.visible = true;
}
else
{
scroll.visible = false;
var offset = (book_width - allocation.width) / 2;
adjustment.lower = offset;
adjustment.upper = offset;
adjustment.page_size = 0;
x_offset = offset;
}
if (show_selected_page)
show_page_view (selected_page_view);
need_layout = false;
show_selected_page = false;
laying_out = false;
}
private bool draw_cb (Gtk.Widget widget, Cairo.Context context)
{
layout ();
double left, top, right, bottom;
context.clip_extents (out left, out top, out right, out bottom);
var pages = new List<PageView> ();
for (var i = 0; i < book.n_pages; i++)
pages.append (get_nth_page (i));
/* Render each page */
foreach (var page in pages)
{
var left_edge = page.x_offset - x_offset;
var right_edge = page.x_offset + page.width - x_offset;
/* Page not visible, don't render */
if (right_edge < left || left_edge > right)
continue;
context.save ();
context.translate (-x_offset, 0);
page.render (context);
context.restore ();
if (page.selected)
drawing_area.get_style_context ().render_focus (context,
page.x_offset - x_offset,
page.y_offset,
page.width,
page.height);
}
return false;
}
private PageView? get_page_at (int x, int y, out int x_, out int y_)
{
x_ = y_ = 0;
for (var i = 0; i < book.n_pages; i++)
{
var page = get_nth_page (i);
var left = page.x_offset;
var right = left + page.width;
var top = page.y_offset;
var bottom = top + page.height;
if (x >= left && x <= right && y >= top && y <= bottom)
{
x_ = x - left;
y_ = y - top;
return page;
}
}
return null;
}
private bool button_cb (Gtk.Widget widget, Gdk.EventButton event)
{
layout ();
drawing_area.grab_focus ();
int x = 0, y = 0;
if (event.type == Gdk.EventType.BUTTON_PRESS)
select_page_view (get_page_at ((int) (event.x + x_offset), (int) event.y, out x, out y));
if (selected_page_view == null)
return false;
/* Modify page */
if (event.button == 1)
{
if (event.type == Gdk.EventType.BUTTON_PRESS)
selected_page_view.button_press (x, y);
else if (event.type == Gdk.EventType.BUTTON_RELEASE)
selected_page_view.button_release (x, y);
else if (event.type == Gdk.EventType.2BUTTON_PRESS)
show_page (selected_page);
}
/* Show pop-up menu on right click */
if (event.button == 3)
show_menu (event);
return false;
}
private void set_cursor (Gdk.CursorType cursor)
{
Gdk.Cursor c;
if (this.cursor == cursor)
return;
this.cursor = cursor;
c = new Gdk.Cursor.for_display (get_display (), cursor);
drawing_area.get_window ().set_cursor (c);
}
private bool motion_cb (Gtk.Widget widget, Gdk.EventMotion event)
{
Gdk.CursorType cursor = Gdk.CursorType.ARROW;
/* Dragging */
if (selected_page_view != null && (event.state & Gdk.ModifierType.BUTTON1_MASK) != 0)
{
var x = (int) (event.x + x_offset - selected_page_view.x_offset);
var y = (int) (event.y - selected_page_view.y_offset);
selected_page_view.motion (x, y);
cursor = selected_page_view.cursor;
}
else
{
int x, y;
var over_page = get_page_at ((int) (event.x + x_offset), (int) event.y, out x, out y);
if (over_page != null)
{
over_page.motion (x, y);
cursor = over_page.cursor;
}
}
set_cursor (cursor);
return false;
}
private bool key_cb (Gtk.Widget widget, Gdk.EventKey event)
{
switch (event.keyval)
{
case 0xff50: /* FIXME: GDK_Home */
selected_page = book.get_page (0);
return true;
case 0xff51: /* FIXME: GDK_Left */
select_page_view (get_prev_page (selected_page_view));
return true;
case 0xff53: /* FIXME: GDK_Right */
select_page_view (get_next_page (selected_page_view));
return true;
case 0xFF57: /* FIXME: GDK_End */
selected_page = book.get_page ((int) book.n_pages - 1);
return true;
default:
return false;
}
}
private bool focus_cb (Gtk.Widget widget, Gdk.EventFocus event)
{
set_selected_page_view (selected_page_view);
return false;
}
private void scroll_cb (Gtk.Adjustment adjustment)
{
if (!laying_out)
redraw ();
}
public void redraw ()
{
drawing_area.queue_draw ();
}
public void select_next_page ()
{
select_page_view (get_next_page (selected_page_view));
}
public void select_prev_page ()
{
select_page_view (get_prev_page (selected_page_view));
}
}
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