138 lines
3.9 KiB
C++
138 lines
3.9 KiB
C++
/*
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timeline-widget.cpp - Implementation of the timeline widget
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Copyright (C) Lumiera.org
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2008, Joel Holdsworth <joel@airwebreathe.org.uk>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* *****************************************************/
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#include "timeline-widget.hpp"
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using namespace Gtk;
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using namespace std;
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using namespace lumiera::gui::widgets::timeline;
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namespace lumiera {
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namespace gui {
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namespace widgets {
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const int TimelineWidget::TrackPadding = 1;
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const int TimelineWidget::HeaderWidth = 100;
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TimelineWidget::TimelineWidget() :
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Table(2, 2),
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totalHeight(0),
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horizontalAdjustment(0, 0, 0),
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verticalAdjustment(0, 0, 0),
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horizontalScroll(horizontalAdjustment),
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verticalScroll(verticalAdjustment),
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ruler("ruler")
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{
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body = new TimelineBody(this);
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g_assert(body != NULL);
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headerContainer = new HeaderContainer(this);
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g_assert(headerContainer != NULL);
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verticalAdjustment.signal_value_changed().connect(
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sigc::mem_fun(this, &TimelineWidget::on_scroll) );
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attach(*body, 1, 2, 1, 2, FILL|EXPAND, FILL|EXPAND);
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attach(ruler, 1, 2, 0, 1, FILL|EXPAND, SHRINK);
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attach(*headerContainer, 0, 1, 1, 2, SHRINK, FILL|EXPAND);
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attach(horizontalScroll, 1, 2, 2, 3, FILL|EXPAND, SHRINK);
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attach(verticalScroll, 2, 3, 1, 2, SHRINK, FILL|EXPAND);
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tracks.push_back(&video1);
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tracks.push_back(&video2);
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update_tracks();
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}
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TimelineWidget::~TimelineWidget()
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{
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g_assert(body != NULL);
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body->unreference();
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g_assert(headerContainer != NULL);
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headerContainer->unreference();
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}
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void
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TimelineWidget::on_scroll()
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{
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}
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void
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TimelineWidget::on_size_allocate(Allocation& allocation)
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{
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Widget::on_size_allocate(allocation);
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update_scroll();
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}
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void
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TimelineWidget::update_tracks()
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{
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g_assert(headerContainer != NULL);
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headerContainer->update_headers();
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// Recalculate the total height of the timeline scrolled area
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totalHeight = 0;
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vector<timeline::Track*>::iterator i;
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for(i = tracks.begin(); i != tracks.end(); i++)
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{
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timeline::Track *track = *i;
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g_assert(track != NULL);
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totalHeight += track->get_height() + TrackPadding;
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}
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}
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void
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TimelineWidget::update_scroll()
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{
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g_assert(body != NULL);
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const Allocation body_allocation = body->get_allocation();
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// Calculate the length that can be scrolled:
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// the total height of all the tracks minus one screenful
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int y_scroll_length = totalHeight - body_allocation.get_height();
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if(y_scroll_length < 0) y_scroll_length = 0;
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// If by resizing we're now over-scrolled, scroll back to
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// maximum distance
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if((int)verticalAdjustment.get_value() > y_scroll_length)
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verticalAdjustment.set_value(y_scroll_length);
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verticalAdjustment.set_upper(y_scroll_length);
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// Hide the scrollbar if no scrolling is possible
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if(y_scroll_length == 0 && verticalScroll.is_visible())
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verticalScroll.hide();
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else if(y_scroll_length != 0 && !verticalScroll.is_visible())
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verticalScroll.show();
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}
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int
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TimelineWidget::get_y_scroll_offset() const
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{
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return (int)verticalAdjustment.get_value();
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}
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} // namespace widgets
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} // namespace gui
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} // namespace lumiera
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