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150b11e953
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@20301 a592a061-630c-0410-9148-cb99ea01b6c8
246 lines
6.8 KiB
C++
246 lines
6.8 KiB
C++
/**
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* \file frontend/Application.h
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author Abdelrazak Younes
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*
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* Full author contact details are available in file CREDITS.
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*/
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#ifndef LYX_APPLICATION_H
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#define LYX_APPLICATION_H
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#include <boost/function.hpp>
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#include <string>
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namespace lyx {
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class BufferView;
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class Color_color;
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struct RGBColor;
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namespace frontend {
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class Clipboard;
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class FontLoader;
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class Gui;
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class LyXView;
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class Selection;
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/// The main application class
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/**
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There should be only one instance of this class. No Qt object
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initialisation should be done before the instanciation of this class.
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Model/View/Controller separation at frontend level in LyX-qt4:
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BufferList (N Buffers)
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Buffer-a
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Buffer-b
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Buffer-c
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Buffer-d
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Application (this is the frontend really, should probably be renamed).
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LyXView-1 (M1 WorkAreas, M1 <= N)
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| <tab-widget>
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| | (many)
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| WorkArea-1
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| BufferView <-----------> Buffer-c
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| Cursor
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LyXView-2 (M2 WorkAreas, M2 <= N, M2 independent of M1)
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...
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1) The Model: \c Buffer
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The Buffer is the in-memory representation of a LyX file format. The
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Buffer does not (should not) have any information on what part of it
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is represented on screen. There is one unique Buffer per opened LyX
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file. A Buffer may or may not be represented on screen; typically, a
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child document does not have an associated BufferView unless the user
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choose to visualize it.
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2) The Controller: \c BufferView / \c Painter \c Cursor
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The BufferView is a tool used by the view (\sa WorkArea) that
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translates a part of the Buffer contents into drawing routines. The
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BufferView asks each inset of the Buffer to draw itself onto the
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screen using the Painter. There can be only one Buffer displayed in
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a BufferView and it is set on construction. Ideally, a BufferView
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should not be able to change the contents of its associated Buffer.
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A BufferView is instanciated and destroyed by a \c WorkArea; it is
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automatically destroyed by the parent WorkArea when its Buffer is
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closed.
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\todo Move all Buffer changing LFUN to LyXFunc or Cursor.
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\todo BufferView::buffer() should only offer const access.
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The \c Painter is just a virtual interface to formalize each kind of
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drawing routines (text, line, rectangle, etc).
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The \c BufferView also contains a Cursor which may or may not be
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visible on screen. The cursor is really just a bookmark to remember
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where the next Buffer insertion/deletion is going to take place.
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3) The View: \c WorkArea (and it's qt4 specialisation GuiWorkArea)
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This contains the real screen area where the drawing is done by the
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Painter. One WorkArea holds one unique \c BufferView. While it could
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be possible that multiple WorkArea share one BufferView, this is not
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something desirable because a BufferView is dependent of the WorkArea
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size.
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The WorkArea also provide a scrollbar which position is translated
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into scrolling command to the inner \c BufferView.
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The WorkArea use the BufferView to translate each keyboard or mouse
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events into terms that the Buffer can understand:
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- insert/delete char
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- select char
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- etc.
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4) The Window: \c LyXView (and its qt4 specialisation \c GuiView)
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This is a full window containing a menubar, toolbars and a central
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widget. A LyXView is in charge of creating and closing a View for a
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given Buffer.
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In the qt4 specialisation, \c GuiView, the central widget is a tab
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widget. Each tab is reverved to the visualisation of one Buffer and
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contains one WorkArea. In the qt4 frontend, one LyXView thus contains
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multiple WorkAreas but this number can limited to one for another
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frontend. The idea is that the kernel should not know how a Buffer
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is displayed on screen; it's the frontend business.
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In the future, we may also have multiple Workareas showing
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simultaneously in the same GuiView (ex: with split window).
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\todo Implement split-window
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In any case, there would be only one WorkArea that gets the focus
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at a time.
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With our current implementation using a QTabWidget, each Tab own its
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own \c WorkArea. Clicking on a tab switch a WorkArea and not really
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a Buffer. LFUN_BUFFER_SWITCH will tell the frontend to search the
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WorkArea associated to this Buffer. The WorkArea is automatically
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created if not already present.
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A WorkArea is connected to the Buffer::closing signal and is thus
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automatically destroyed when its Buffer is closed.
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*/
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class Application
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{
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public:
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///
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Application(int & argc, char ** argv);
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///
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virtual ~Application() {}
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///
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virtual Gui & gui() = 0;
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/// Start the main event loop.
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/// The batch command is programmed to be execute once
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/// the event loop is started.
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virtual int exec() = 0;
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/// Quit running LyX.
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/**
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* This may either quit directly or record the exit status
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* and only stop the event loop.
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*/
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virtual void exit(int status) = 0;
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/**
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* Synchronise all pending events.
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*/
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virtual void syncEvents() = 0;
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///
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virtual Clipboard & clipboard() = 0;
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///
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virtual Selection & selection() = 0;
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///
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virtual FontLoader & fontLoader() = 0;
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/// return a suitable serif font name.
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virtual std::string const romanFontName() = 0;
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/// return a suitable sans serif font name.
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virtual std::string const sansFontName() = 0;
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/// return a suitable monospaced font name.
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virtual std::string const typewriterFontName() = 0;
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/**
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* Given col, fills r, g, b in the range 0-255.
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* The function returns true if successful.
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* It returns false on failure and sets r, g, b to 0.
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*/
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virtual bool getRgbColor(Color_color col, RGBColor & rgbcol) = 0;
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/** Eg, passing Color::black returns "000000",
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* passing Color::white returns "ffffff".
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*/
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virtual std::string const hexName(Color_color col) = 0;
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/**
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* update an altered GUI color
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*/
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virtual void updateColor(Color_color col) = 0;
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/**
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* add a callback for socket read notification
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* @param fd socket descriptor (file/socket/etc)
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*/
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typedef boost::function<void()> SocketCallback;
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virtual void registerSocketCallback(int fd, SocketCallback func) = 0;
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/**
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* remove a I/O read callback
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* @param fd socket descriptor (file/socket/etc)
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*/
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virtual void unregisterSocketCallback(int fd) = 0;
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/// Create the main window with given geometry settings.
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LyXView & createView(unsigned int width, unsigned int height,
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int posx, int posy, int maximized,
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unsigned int iconSizeXY, const std::string & geometryArg);
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///
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LyXView const * currentView() const;
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///
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LyXView * currentView();
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///
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void setCurrentView(LyXView & current_view);
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private:
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/// This LyXView is the one receiving Clipboard and Selection
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/// Events
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LyXView * current_view_;
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}; // Application
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} // namespace frontend
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frontend::Application * theApp();
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frontend::Application * createApplication(int & argc, char * argv[]);
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} // namespace lyx
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#endif // LYX_APPLICATION_H
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