4 * This file is part of LyX, the document processor.
5 * Licence details can be found in the file COPYING.
7 * \author Alfredo Braustein
8 * \author Lars Gullik Bjønnes
10 * \author Jürgen Vigna
12 * Full author contact details are available in file CREDITS.
18 #include "DocumentClassPtr.h"
20 #include "update_flags.h"
22 #include "support/strfwd.h"
23 #include "support/types.h"
27 namespace support { class FileName; }
29 namespace frontend { class Painter; }
30 namespace frontend { class GuiBufferViewDelegate; }
48 class ParagraphMetrics;
61 /// Scrollbar Parameters.
62 struct ScrollbarParameters
64 // These parameters are normalized against the screen geometry and pixel
65 // coordinates. Position 0 corresponds to the top the the screen.
67 : min(0), max(0), single_step(1), page_step(1)
69 /// Minimum scrollbar position in pixels.
71 /// Maximum scrollbar position in pixels.
73 /// Line-scroll amount in pixels.
75 /// Page-scroll amount in pixels.
79 /// Screen view of a Buffer.
81 * A BufferView encapsulates a view onto a particular
82 * buffer, and allows access to operate upon it. A view
83 * is a sliding window of the entire document rendering.
84 * It is the official interface between the LyX core and
85 * the frontend WorkArea.
94 explicit BufferView(Buffer & buffer);
98 /// return the buffer being viewed.
100 Buffer const & buffer() const;
103 void setFullScreen(bool full_screen) { full_screen_ = full_screen; }
106 int rightMargin() const;
109 int leftMargin() const;
111 /// return the on-screen size of this length
113 * This is a wrapper around Length::inPixels that uses the
114 * bufferview width as width and the EM value of the default
117 int inPixels(Length const & len) const;
119 /** Return the number of pixels equivalent to \c pix pixels at
120 * 100dpi and 100% zoom.
122 int zoomedPixels(int pix) const;
124 /// \return true if the BufferView is at the top of the document.
125 bool isTopScreen() const;
127 /// \return true if the BufferView is at the bottom of the document.
128 bool isBottomScreen() const;
130 /// Add \p flags to current update flags and trigger an update.
131 /* If this method is invoked several times before the update
132 * actually takes place, the effect is cumulative.
133 * \c Update::FitCursor means first to do a FitCursor, and to
134 * force an update if screen position changes.
135 * \c Update::Force means to force an update in any case.
137 void processUpdateFlags(Update::flags flags);
139 /// return true if one shall move the screen to fit the cursor.
140 /// Only to be called with good y coordinates (after a bv::metrics)
141 bool needsFitCursor() const;
143 // Returns the amount of horizontal scrolling applied to the
144 // top-level row where the cursor lies
145 int horizScrollOffset() const;
146 // Returns the amount of horizontal scrolling applied to the
147 // row of text starting at (pit, pos)
148 int horizScrollOffset(Text const * text,
149 pit_type pit, pos_type pos) const;
151 /// reset the scrollbar to reflect current view position.
152 void updateScrollbar();
153 /// return the Scrollbar Parameters.
154 ScrollbarParameters const & scrollbarParameters() const;
155 /// \return Tool tip for the given position.
156 docstring toolTip(int x, int y) const;
157 /// \return the context menu for the given position.
158 std::string contextMenu(int x, int y) const;
160 /// Save the current position as bookmark.
161 /// if idx == 0, save to temp_bookmark
162 void saveBookmark(unsigned int idx);
163 /// goto a specified position, try top_id first, and then bottom_pit.
164 /// \return true if success
166 pit_type bottom_pit, ///< Paragraph pit, used when par_id is zero or invalid.
167 pos_type bottom_pos, ///< Paragraph pit, used when par_id is zero or invalid.
168 int top_id, ///< Paragraph ID, \sa Paragraph
169 pos_type top_pos ///< Position in the \c Paragraph
171 /// return the current change at the cursor.
172 Change const getCurrentChange() const;
174 /// move cursor to the named label.
175 void gotoLabel(docstring const & label);
177 /// set the cursor based on the given TeX source row.
178 bool setCursorFromRow(int row);
179 /// set the cursor based on the given start and end TextEntries.
180 bool setCursorFromEntries(TexRow::TextEntry start, TexRow::TextEntry end);
182 /// set cursor to the given inset. Return true if found.
183 bool setCursorFromInset(Inset const *);
184 /// Recenters the BufferView such that the passed cursor
185 /// is in the center.
187 /// Ensure that the BufferView cursor is visible.
188 /// This method will automatically scroll and update the BufferView
189 /// (metrics+drawing) if needed.
191 /// Ensure the passed cursor \p dit is visible.
192 /// This method will automatically scroll and update the BufferView
193 /// (metrics+drawing) if needed.
194 /// \param recenter Whether the cursor should be centered on screen
195 void showCursor(DocIterator const & dit, bool recenter,
197 /// Scroll to the cursor.
198 void scrollToCursor();
199 /// Scroll to the cursor.
200 /// \param recenter Whether the cursor should be centered on screen
201 bool scrollToCursor(DocIterator const & dit, bool recenter);
202 /// scroll down document by the given number of pixels.
203 int scrollDown(int pixels);
204 /// scroll up document by the given number of pixels.
205 int scrollUp(int pixels);
206 /// scroll document by the given number of pixels.
207 int scroll(int pixels);
208 /// Scroll the view by a number of pixels.
209 void scrollDocView(int pixels, bool update);
210 /// Set the cursor position based on the scrollbar one.
211 void setCursorFromScrollbar();
213 /// return the pixel width of the document view.
214 int workWidth() const;
215 /// return the pixel height of the document view.
216 int workHeight() const;
218 /// return the inline completion postfix.
219 docstring const & inlineCompletion() const;
220 /// return the number of unique characters in the inline completion.
221 size_t const & inlineCompletionUniqueChars() const;
222 /// return the position in the buffer of the inline completion postfix.
223 DocIterator const & inlineCompletionPos() const;
224 /// make sure inline completion position is OK
225 void resetInlineCompletionPos();
226 /// set the inline completion postfix and its position in the buffer.
227 /// Updates the updateFlags in \c cur.
228 void setInlineCompletion(Cursor const & cur, DocIterator const & pos,
229 docstring const & completion, size_t uniqueChars = 0);
231 /// translate and insert a character, using the correct keymap.
232 void translateAndInsert(char_type c, Text * t, Cursor & cur);
234 /// \return true if we've made a decision
235 bool getStatus(FuncRequest const & cmd, FuncStatus & flag);
236 /// execute the given function.
237 void dispatch(FuncRequest const & cmd, DispatchResult & dr);
239 /// request an X11 selection.
240 /// \return the selected string.
241 docstring const requestSelection();
242 /// clear the X11 selection.
243 void clearSelection();
245 /// resize the BufferView.
247 void resize(int width, int height);
249 /// dispatch method helper for \c WorkArea
251 void mouseEventDispatch(FuncRequest const & ev);
254 CursorStatus cursorStatus(DocIterator const & dit) const;
255 /// access to full cursor.
257 /// access to full cursor.
258 Cursor const & cursor() const;
260 /// This will also open all relevant collapsible insets.
261 void setCursor(DocIterator const &);
262 /// set the selection up to dit.
263 void setCursorSelectionTo(DocIterator const & dit);
264 /// Check deleteEmptyParagraphMechanism and update metrics if needed.
265 /// \retval true if an update was needed.
266 bool checkDepm(Cursor & cur, Cursor & old);
268 /// This is used when handling LFUN_MOUSE_PRESS.
269 bool mouseSetCursor(Cursor & cur, bool select = false);
271 /// sets the selection.
272 /* When \c backwards == false, set anchor
273 * to \c cur and cursor to \c cur + \c length. When \c
274 * backwards == true, set anchor to \c cur and cursor to \c
277 void putSelectionAt(DocIterator const & cur,
278 int length, bool backwards);
280 /// selects the item at cursor if its paragraph is empty.
281 bool selectIfEmpty(DocIterator & cur);
283 /// update the internal \c ViewMetricsInfo.
284 void updateMetrics();
286 // this is the "nodraw" drawing stage: only set the positions of the
287 // insets in metrics cache.
288 void updatePosCache();
291 TextMetrics const & textMetrics(Text const * t) const;
292 TextMetrics & textMetrics(Text const * t);
294 ParagraphMetrics const & parMetrics(Text const *, pit_type) const;
297 CoordCache & coordCache();
299 CoordCache const & coordCache() const;
302 MathRow const & mathRow(MathData const * cell) const;
304 void setMathRow(MathData const * cell, MathRow const & mrow);
307 Point getPos(DocIterator const & dit) const;
308 /// is the paragraph of the cursor visible ?
309 bool paragraphVisible(DocIterator const & dit) const;
310 /// is the caret currently visible in the view
311 bool caretInView() const;
312 /// get the position and height of the caret
313 void caretPosAndHeight(Point & p, int & h) const;
316 void draw(frontend::Painter & pain, bool paint_caret);
318 /// get this view's keyboard map handler.
321 Intl const & getIntl() const;
324 // Messages to the GUI
326 /// This signal is emitted when some message shows up.
327 void message(docstring const & msg);
329 /// This signal is emitted when some dialog needs to be shown.
330 void showDialog(std::string const & name);
332 /// This signal is emitted when some dialog needs to be shown with
334 void showDialog(std::string const & name, std::string const & data,
337 /// This signal is emitted when some dialogs needs to be updated.
338 void updateDialog(std::string const & name, std::string const & data);
341 void setGuiDelegate(frontend::GuiBufferViewDelegate *);
344 docstring contentsOfPlaintextFile(support::FileName const & f);
345 // Insert plain text file (if filename is empty, prompt for one)
346 void insertPlaintextFile(support::FileName const & f, bool asParagraph);
348 void insertLyXFile(support::FileName const & f, bool const ignorelang = false);
349 /// save temporary bookmark for jump back navigation
350 void bookmarkEditPosition();
351 /// Find and return the inset associated with given dialog name.
352 Inset * editedInset(std::string const & name) const;
353 /// Associate an inset associated with given dialog name.
354 void editInset(std::string const & name, Inset * inset);
356 void clearLastInset(Inset * inset) const;
357 /// Is the mouse hovering a clickable inset or element?
358 bool clickableInset() const;
360 void makeDocumentClass();
364 BufferView(BufferView const &);
365 void operator=(BufferView const &);
367 /// the position relative to (0, baseline) of outermost paragraph
368 Point coordOffset(DocIterator const & dit) const;
369 /// Update current paragraph metrics.
370 /// \return true if no further update is needed.
371 bool singleParUpdate();
372 /// do the work for the public updateMetrics()
373 void updateMetrics(Update::flags & update_flags);
375 // Set the row on which the cursor lives.
376 void setCurrentRowSlice(CursorSlice const & rowSlice);
378 // Check whether the row where the cursor lives needs to be scrolled.
379 // Update the drawing strategy if needed.
380 void checkCursorScrollOffset();
382 /// The minimal size of the document that is visible. Used
383 /// when it is allowed to scroll below the document.
384 int minVisiblePart();
386 /// Search recursively for the innermost inset that covers (x, y) position.
387 /// \retval 0 if no inset is found.
388 Inset const * getCoveringInset(
389 Text const & text, //< The Text where we start searching.
390 int x, //< x-coordinate on screen
391 int y //< y-coordinate on screen
394 /// Update the hovering status of the insets. This is called when
395 /// either the screen is updated or when the buffer has scolled.
396 void updateHoveredInset() const;
399 void updateDocumentClass(DocumentClassConstPtr olddc);
413 /// some space for drawing the 'nested' markers (in pixel)
414 inline int nestMargin() { return 15; }
416 /// margin for changebar
417 inline int changebarMargin() { return 12; }
421 #endif // BUFFERVIEW_H