164 lines
4.7 KiB
C++
164 lines
4.7 KiB
C++
/*
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timeline-zoom-scale.cpp - Implementation of the zoom scale widget
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Copyright (C) Lumiera.org
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2011, Michael R. Fisher <mfisher31@gmail.com>
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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
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the 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 "gui/widgets/timeline/timeline-zoom-scale.hpp"
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#include "gui/widgets/timeline-widget.hpp"
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using namespace Gtk;
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namespace gui {
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namespace widgets {
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class TimelineWidget;
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namespace timeline {
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/**
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* @todo The initial adjustment value needs to
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* match what the TimelineViewWindow's actual timeScale
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* Value is. TimelineViewWindow::get_time_scale() is
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* currently a public method, but will soon be private.
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* Maybe TimelineViewWindow can have a zoom_adjustment
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* that gets passed to this widget's Constructor?
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*
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* @todo actually there is a more involved problem.
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* The TimelineWidget maintains a TimelineState, which in turn
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* owns the TimelineViewWindow. Now, the problem is: when we
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* switch to another Sequence (View), then this TimelineState
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* gets switched too, causing also a entirely different TimelineViewWindow
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* to become effective. Thus
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* - how can we managed to be notified from that switch?
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* - problem is: TimelineZoomScale widget is owned by the TimelinePannel.
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* Likewise, TimelineWidget is owned by the TimelinePannel. But the
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* state handling/switching logic is embedded within TimelineWidget
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* - and finally: how can we translate the actual scale (in time units),
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* as maintained within TimelineViewWindow, back into the adjustment
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* used here (which uses a relative scale 0...1.0 )
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*
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*/
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TimelineZoomScale::TimelineZoomScale()
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: HBox()
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, adjustment(0.5, 0.0, 1.0, 0.000001)
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, slider()
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, zoomIn(Stock::ZOOM_IN)
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, zoomOut(Stock::ZOOM_OUT)
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, smoothing_factor(9.0)
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, button_step_size(0.03)
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{
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/* Setup the Slider Control */
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slider.set_adjustment(adjustment);
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slider.set_size_request(123,10);
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slider.set_digits(6);
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slider.set_inverted(true);
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slider.set_draw_value(false);
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/* Make our connections */
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zoomIn.signal_clicked().
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connect(sigc::mem_fun(this, &TimelineZoomScale::on_zoom_in_clicked));
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zoomOut.signal_clicked().
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connect(sigc::mem_fun(this, &TimelineZoomScale::on_zoom_out_clicked));
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adjustment.signal_value_changed().
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connect(sigc::mem_fun(this, &TimelineZoomScale::on_zoom));
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/* Add Our Widgets and show them */
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pack_start(zoomOut,PACK_SHRINK);
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pack_start(slider,PACK_SHRINK);
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pack_start(zoomIn,PACK_SHRINK);
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show_all();
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}
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void
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TimelineZoomScale::wireTimelineState (boost::shared_ptr<TimelineState> currentState,
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TimelineWidget::TimelineStateChangeSignal stateChangeSignal)
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{
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on_timeline_state_changed (currentState);
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stateChangeSignal.connect (sigc::mem_fun(this, &TimelineZoomScale::on_timeline_state_changed));
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}
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void
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TimelineZoomScale::on_timeline_state_changed (boost::shared_ptr<TimelineState> newState)
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{
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REQUIRE (newState);
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timelineState = newState;
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UNIMPLEMENTED ("react on the timeline state change"); ///////////////////////////TODO
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}
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void
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TimelineZoomScale::on_zoom_in_clicked()
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{
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double newValue = adjustment.get_value() - button_step_size;
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adjustment.set_value(newValue);
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}
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void
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TimelineZoomScale::on_zoom_out_clicked()
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{
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double newValue = adjustment.get_value() + button_step_size;
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adjustment.set_value(newValue);
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}
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void
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TimelineZoomScale::on_zoom()
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{
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zoomSignal.emit(calculate_zoom_scale()) ;
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}
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sigc::signal<void, int64_t>
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TimelineZoomScale::signal_zoom()
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{
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return zoomSignal;
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}
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TimelineViewWindow&
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TimelineZoomScale::getViewWindow()
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{
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REQUIRE (timelineState, "lifecycle error");
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return timelineState->get_view_window();
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}
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int64_t
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TimelineZoomScale::calculate_zoom_scale()
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{
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int64_t zoom_scale = 0;
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double smoothed = pow(adjustment.get_value(), smoothing_factor);
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zoom_scale = (int64_t)( smoothed * (double)TimelineWidget::MaxScale);
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/* Prevent Zooming in To Close and Far */
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if(zoom_scale < 1)
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zoom_scale = 1;
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if(zoom_scale > TimelineWidget::MaxScale)
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zoom_scale = TimelineWidget::MaxScale;
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return zoom_scale;
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}
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} // namespace gui
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} // namespace widgets
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} // namespace timeline
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