lyx_mirror/src/BufferView.h
André Pönitz bdc6d56cc7 initialize scrollbar parameters to some sensible dummy values.
valgrind reported conditional jumps on uninitialized values
in BufferView.cpp:1920


git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@24298 a592a061-630c-0410-9148-cb99ea01b6c8
2008-04-16 18:18:12 +00:00

329 lines
9.1 KiB
C++

// -*- C++ -*-
/**
* \file BufferView.h
* This file is part of LyX, the document processor.
* Licence details can be found in the file COPYING.
*
* \author Alfredo Braustein
* \author Lars Gullik Bjønnes
* \author John Levon
* \author Jürgen Vigna
*
* Full author contact details are available in file CREDITS.
*/
#ifndef BUFFER_VIEW_H
#define BUFFER_VIEW_H
#include "update_flags.h"
#include "support/strfwd.h"
#include "support/types.h"
namespace lyx {
namespace support { class FileName; }
namespace frontend { class Painter; }
namespace frontend { class GuiBufferViewDelegate; }
class Buffer;
class Change;
class CoordCache;
class Cursor;
class DocIterator;
class FuncRequest;
class FuncStatus;
class Intl;
class Inset;
class ParIterator;
class ParagraphMetrics;
class Point;
class Text;
class TextMetrics;
enum CursorStatus {
CUR_INSIDE,
CUR_ABOVE,
CUR_BELOW
};
/// Scrollbar Parameters.
struct ScrollbarParameters
{
ScrollbarParameters()
: min(0), max(1), position(0), single_step(1), page_step(1)
{}
/// Minimum scrollbar position in pixels.
int min;
/// Maximum scrollbar position in pixels.
int max;
/// Current position in the document in pixels.
int position;
/// Line-scroll amount in pixels.
int single_step;
/// Page-scroll amount in pixels.
int page_step;
};
/// Screen view of a Buffer.
/**
* A BufferView encapsulates a view onto a particular
* buffer, and allows access to operate upon it. A view
* is a sliding window of the entire document rendering.
* It is the official interface between the LyX core and
* the frontend WorkArea.
*
* \sa WorkArea
* \sa Buffer
* \sa CoordCache
*/
class BufferView {
public:
///
explicit BufferView(Buffer & buffer);
///
~BufferView();
/// return the buffer being viewed.
Buffer & buffer();
Buffer const & buffer() const;
///
void setFullScreen(bool full_screen) { full_screen_ = full_screen; }
/// right margin
int rightMargin() const;
/// left margin
int leftMargin() const;
/// \return true if the BufferView is at the top of the document.
bool isTopScreen() const;
/// \return true if the BufferView is at the bottom of the document.
bool isBottomScreen() const;
/// perform pending metrics updates.
/** \c Update::FitCursor means first to do a FitCursor, and to
* force an update if screen position changes.
* \c Update::Force means to force an update in any case.
* \retval true if a screen redraw is needed
*/
void processUpdateFlags(Update::flags flags);
/// move the screen to fit the cursor.
/// Only to be called with good y coordinates (after a bv::metrics)
bool fitCursor();
/// reset the scrollbar to reflect current view position.
void updateScrollbar();
/// return the Scrollbar Parameters.
ScrollbarParameters const & scrollbarParameters() const;
/// \return Tool tip for the given position.
docstring toolTip(int x, int y) const;
/// \return the context menu for the given position.
docstring contextMenu(int x, int y) const;
/// Save the current position as bookmark.
/// if idx == 0, save to temp_bookmark
void saveBookmark(unsigned int idx);
/// goto a specified position, try top_id first, and then bottom_pit.
/// \return true if success
bool moveToPosition(
pit_type bottom_pit, ///< Paragraph pit, used when par_id is zero or invalid.
pos_type bottom_pos, ///< Paragraph pit, used when par_id is zero or invalid.
int top_id, ///< Paragraph ID, \sa Paragraph
pos_type top_pos ///< Position in the \c Paragraph
);
/// return the current change at the cursor.
Change const getCurrentChange() const;
/// move cursor to the named label.
void gotoLabel(docstring const & label);
/// set the cursor based on the given TeX source row.
void setCursorFromRow(int row);
/// Ensure that the BufferView cursor is visible.
/// This method will automatically scroll and update the BufferView
/// if needed.
void showCursor();
/// Ensure the passed cursor \p dit is visible.
/// This method will automatically scroll and update the BufferView
/// if needed.
void showCursor(DocIterator const & dit);
/// LFUN_SCROLL Helper.
void lfunScroll(FuncRequest const & cmd);
/// scroll down document by the given number of pixels.
void scrollDown(int pixels);
/// scroll up document by the given number of pixels.
void scrollUp(int pixels);
/// scroll document by the given number of pixels.
void scroll(int pixels);
/// Scroll the view by a number of pixels.
void scrollDocView(int pixels);
/// Set the cursor position based on the scrollbar one.
void setCursorFromScrollbar();
/// return the pixel width of the document view.
int workWidth() const;
/// return the pixel height of the document view.
int workHeight() const;
/// return the inline completion postfix.
docstring const & inlineCompletion() const;
/// return the number of unique characters in the inline completion.
size_t const & inlineCompletionUniqueChars() const;
/// return the position in the buffer of the inline completion postfix.
DocIterator const & inlineCompletionPos() const;
/// set the inline completion postfix and its position in the buffer.
/// Updates the updateFlags in \c cur.
void setInlineCompletion(Cursor & cur, DocIterator const & pos,
docstring const & completion, size_t uniqueChars = 0);
/// translate and insert a character, using the correct keymap.
void translateAndInsert(char_type c, Text * t, Cursor & cur);
/// return true for events that will handle.
FuncStatus getStatus(FuncRequest const & cmd);
/// execute the given function.
/// \return true if the function has been processed.
bool dispatch(FuncRequest const & argument);
/// request an X11 selection.
/// \return the selected string.
docstring const requestSelection();
/// clear the X11 selection.
void clearSelection();
/// resize the BufferView.
/// \sa WorkArea
void resize(int width, int height);
/// dispatch method helper for \c WorkArea
/// \sa WorkArea
void mouseEventDispatch(FuncRequest const & ev);
/// access to anchor.
pit_type anchor_ref() const;
///
CursorStatus cursorStatus(DocIterator const & dit) const;
/// access to full cursor.
Cursor & cursor();
/// access to full cursor.
Cursor const & cursor() const;
/// sets cursor.
/// This will also open all relevant collapsable insets.
void setCursor(DocIterator const &);
/// Check deleteEmptyParagraphMechanism and update metrics if needed.
/// \retval true if an update was needed.
bool checkDepm(Cursor & cur, Cursor & old);
/// sets cursor.
/// This is used when handling LFUN_MOUSE_PRESS.
bool mouseSetCursor(Cursor & cur, bool select = false);
/// sets the selection.
/* When \c backwards == false, set anchor
* to \c cur and cursor to \c cur + \c length. When \c
* backwards == true, set anchor to \c cur and cursor to \c
* cur + \c length.
*/
void putSelectionAt(DocIterator const & cur,
int length, bool backwards);
/// update the internal \c ViewMetricsInfo.
void updateMetrics();
///
TextMetrics const & textMetrics(Text const * t) const;
TextMetrics & textMetrics(Text const * t);
///
ParagraphMetrics const & parMetrics(Text const *, pit_type) const;
///
CoordCache & coordCache();
///
CoordCache const & coordCache() const;
///
Point getPos(DocIterator const & dit, bool boundary) const;
///
void draw(frontend::Painter & pain);
/// get this view's keyboard map handler.
Intl & getIntl();
///
Intl const & getIntl() const;
//
// Messages to the GUI
//
/// This signal is emitted when some message shows up.
void message(docstring const & msg);
/// This signal is emitted when some dialog needs to be shown.
void showDialog(std::string const & name);
/// This signal is emitted when some dialog needs to be shown with
/// some data.
void showDialog(std::string const & name, std::string const & data,
Inset * inset = 0);
/// This signal is emitted when some dialogs needs to be updated.
void updateDialog(std::string const & name, std::string const & data);
///
void setGuiDelegate(frontend::GuiBufferViewDelegate *);
///
docstring contentsOfPlaintextFile(support::FileName const & f);
// Insert plain text file (if filename is empty, prompt for one)
void insertPlaintextFile(support::FileName const & f, bool asParagraph);
///
void insertLyXFile(support::FileName const & f);
private:
/// noncopyable
BufferView(BufferView const &);
void operator=(BufferView const &);
// the position relative to (0, baseline) of outermost paragraph
Point coordOffset(DocIterator const & dit, bool boundary) const;
/// Update current paragraph metrics.
/// \return true if no further update is needed.
bool singleParUpdate();
/// Search recursively for the the innermost inset that covers (x, y) position.
/// \retval 0 if no inset is found.
Inset const * getCoveringInset(
Text const & text, //< The Text where we start searching.
int x, //< x-coordinate on screen
int y //< y-coordinate on screen
) const;
///
int width_;
///
int height_;
///
bool full_screen_;
///
Buffer & buffer_;
struct Private;
Private * const d;
};
/// some space for drawing the 'nested' markers (in pixel)
inline int nestMargin() { return 15; }
/// margin for changebar
inline int changebarMargin() { return 12; }
} // namespace lyx
#endif // BUFFERVIEW_H