Ichthyostega
14588dbc19
it occurred to me that effectively we abandoned the use of a business facade and proxy model in the UI. The connection becomes entirely message based now. To put that into context, the originally intended architecture never came to life. The UI development stalled before this could happen; possibly it was also hampered by the "impedance mismatch" between our intentions in the core and such a classical, model centric architecture. Joel several times complained that he felt blocked; but I did not really understand this issue. Only recently, when I came to adapting the timeline display to GTK-3, I realised the model centric approach can not possibly work with such an open model as intended in our case. It would lead to endless cascades of introspection.
99 lines
3.7 KiB
C++
99 lines
3.7 KiB
C++
/*
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TIMELINE-CONTROLLER.hpp - coordinate operation of timeline display
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Copyright (C) Lumiera.org
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2016, Hermann Vosseler <Ichthyostega@web.de>
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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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/** @file timeline-controller.hpp
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** Controller to supervise operation of timeline display in the UI.
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** While the TimelineWidget is the top level entry point to any facility dealing with
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** timeline display and editing operations, the widget in turn creates a TimelineController
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** right away, which then takes initiative to populate the display with the corresponding
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** session::Timeline contents. The controller thus serves as the model connection through
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** the UI-Bus and becomes the active part of running the timeline display, delegating
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** display activities to the widget, which in turn uses the timeline::LayoutManager to
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** work out the details of presentation in collaboration with the local UI model elements.
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** Incidentally, those UI model elements, which are actually Presenters, are managed as
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** children of the TimelineController; this makes sense from an architectural point of view:
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** In Lumiera, we separate between the core concerns and the questions of UI mechanics. For
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** the former, the global angle of view, the roles of _controller_ and _model_ are mediated
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** by the control::UiBus, while the [tangible elements](\ref model::Tangible), play the
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** role of the _view._ But at the same time, following the local UI centric angle, the latter
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** entities act more like presenters, forming a dedicated _view model,_ while controlling
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** mostly passive view components (widgets).
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**
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** To sum up
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** - TimelineController is a Tangible, connected to the UiBus, representing "the timeline"
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** - it directly manages a set of TrackPresenter entities, to correspond to the session::Fork
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** - these in turn manage a set of ClipPresenter entities
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** - and those presenters care for injecting suitable widgets into the TimelineWidget's parts.
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**
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** @todo as of 12/2016 a complete rework of the timeline display is underway
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**
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*/
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#ifndef GUI_TIMELINE_TIMELINE_CONTROLLER_H
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#define GUI_TIMELINE_TIMELINE_CONTROLLER_H
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#include "gui/gtk-base.hpp"
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#include "lib/time/timevalue.hpp"
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//#include <memory>
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//#include <vector>
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namespace gui {
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namespace timeline {
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/**
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* Core timeline display (custom widget).
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* @todo WIP-WIP-rewrite as of 12/2016
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* @remarks At top level, this widget is split into a header pane (left)
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* and a scrollable timeline body (right). The layout of both parts is aligned.
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*/
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class TimelineController
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{
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public:
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/**
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* @param source_state state to be used used as the
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* data source (model) for this timeline widget.
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*/
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TimelineController();
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~TimelineController();
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public: /* ===== Control interface ===== */
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public: /* ===== Signals ===== */
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private:/* ===== Events ===== */
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private:/* ===== Internals ===== */
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};
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}}// namespace gui::timeline
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#endif /*GUI_TIMELINE_TIMELINE_CONTROLLER_H*/
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