]> git.lyx.org Git - lyx.git/blobdiff - src/BufferView.cpp
initial basic context menu support.
[lyx.git] / src / BufferView.cpp
index 1257d3da3ca427eaf6d2d8a156db782257a077d0..3fdb769ed792b49a9beb6d1cf710b61a1ac33c5f 100644 (file)
@@ -39,6 +39,7 @@
 #include "LyXFunc.h"
 #include "Layout.h"
 #include "LyXRC.h"
+#include "MenuBackend.h"
 #include "MetricsInfo.h"
 #include "Paragraph.h"
 #include "paragraph_funcs.h"
@@ -58,8 +59,8 @@
 #include "insets/InsetText.h"
 
 #include "frontends/alert.h"
+#include "frontends/Application.h"
 #include "frontends/Delegates.h"
-#include "frontends/FileDialog.h"
 #include "frontends/FontMetrics.h"
 #include "frontends/Painter.h"
 #include "frontends/Selection.h"
 #include <iterator>
 #include <vector>
 
-using std::distance;
-using std::endl;
-using std::ifstream;
-using std::istringstream;
-using std::istream_iterator;
-using std::make_pair;
-using std::min;
-using std::max;
-using std::mem_fun_ref;
-using std::string;
-using std::vector;
+using namespace std;
+using namespace lyx::support;
 
 namespace lyx {
 
-using support::addPath;
-using support::bformat;
-using support::FileFilterList;
-using support::FileName;
-using support::fileSearch;
-using support::makeDisplayPath;
-using support::makeAbsPath;
-using support::package;
-
 namespace Alert = frontend::Alert;
 
 namespace {
@@ -195,6 +178,7 @@ void gotoInset(BufferView * bv, vector<InsetCode> const & codes,
 
        tmpcur.clearSelection();
        bv->setCursor(tmpcur);
+       bv->showCursor();
 }
 
 
@@ -206,7 +190,7 @@ void gotoInset(BufferView * bv, InsetCode code, bool same_content)
 
 
 /// A map from a Text to the associated text metrics
-typedef std::map<Text const *, TextMetrics> TextMetricsCache;
+typedef map<Text const *, TextMetrics> TextMetricsCache;
 
 enum ScreenUpdateStrategy {
        NoScreenUpdate,
@@ -227,7 +211,7 @@ enum ScreenUpdateStrategy {
 struct BufferView::Private
 {
        Private(BufferView & bv): wh_(0), cursor_(bv),
-               anchor_ref_(0), offset_ref_(0), need_centering_(false),
+               anchor_pit_(0), anchor_ypos_(0),
                last_inset_(0), gui_(0)
        {}
 
@@ -249,11 +233,11 @@ struct BufferView::Private
        ///
        Cursor cursor_;
        ///
-       pit_type anchor_ref_;
+       pit_type anchor_pit_;
        ///
-       int offset_ref_;
+       int anchor_ypos_;
        ///
-       bool need_centering_;
+       vector<int> par_height_;
 
        /// keyboard mapping object.
        Intl intl_;
@@ -351,7 +335,6 @@ bool BufferView::fitCursor()
                if (p.y_ - asc >= 0 && p.y_ + des < height_)
                        return false;
        }
-       center();
        return true;
 }
 
@@ -369,9 +352,7 @@ void BufferView::processUpdateFlags(Update::flags flags)
                << ", singlepar = " << (flags & Update::SinglePar)
                << "]  buffer: " << &buffer_);
 
-       // Update macro store
-       if (!(cursor().inMathed() && cursor().inMacroMode()))
-               buffer_.updateMacros();
+       buffer_.updateMacros();
 
        // Now do the first drawing step if needed. This consists on updating
        // the CoordCache in updateMetrics().
@@ -392,11 +373,9 @@ void BufferView::processUpdateFlags(Update::flags flags)
 
        if (flags == Update::FitCursor
                || flags == (Update::Decoration | Update::FitCursor)) {
-               bool const fit_cursor = fitCursor();
                // tell the frontend to update the screen if needed.
-               if (fit_cursor) {
-                       updateMetrics();
-                       buffer_.changed();
+               if (fitCursor()) {
+                       showCursor();
                        return;
                }
                if (flags & Update::Decoration) {
@@ -409,85 +388,90 @@ void BufferView::processUpdateFlags(Update::flags flags)
                return;
        }
 
-       bool const full_metrics = flags & Update::Force;
+       bool const full_metrics = flags & Update::Force || !singleParUpdate();
 
-       if (full_metrics || !singleParUpdate())
+       if (full_metrics)
                // We have to update the full screen metrics.
                updateMetrics();
 
        if (!(flags & Update::FitCursor)) {
+               // Nothing to do anymore. Trigger a redraw and return
                buffer_.changed();
                return;
        }
 
-       //FIXME: updateMetrics() does not update paragraph position
+       // updateMetrics() does not update paragraph position
        // This is done at draw() time. So we need a redraw!
        buffer_.changed();
-       if (!fitCursor())
-               // The screen has already been updated thanks to the
-               // 'buffer_.changed()' call three line above. So no need
-               // to redraw again.
-               return;
 
-       // The screen has been recentered around the cursor position so
-       // refresh it:
-       updateMetrics();
-       buffer_.changed();
+       if (fitCursor()) {
+               // The cursor is off screen so ensure it is visible.
+               // refresh it:
+               showCursor();
+       }
 }
 
 
 void BufferView::updateScrollbar()
 {
-       Text & t = buffer_.text();
-       TextMetrics & tm = d->text_metrics_[&t];
+       if (height_ == 0)
+               return;
 
-       int const parsize = int(t.paragraphs().size() - 1);
-       if (d->anchor_ref_ >  parsize)  {
-               d->anchor_ref_ = parsize;
-               d->offset_ref_ = 0;
-       }
+       Text & t = buffer_.text();
+       TextMetrics & tm = d->text_metrics_[&t];                
 
        LYXERR(Debug::GUI, " Updating scrollbar: height: "
                << t.paragraphs().size()
                << " curr par: " << d->cursor_.bottom().pit()
                << " default height " << defaultRowHeight());
 
+       int const parsize = int(t.paragraphs().size());
+       if (d->par_height_.size() != parsize) {
+               d->par_height_.clear();
+               // FIXME: We assume a default paragraph height of 2 rows. This
+               // should probably be pondered with the screen width.
+               d->par_height_.resize(parsize, defaultRowHeight() * 2);
+       }
+
        // It would be better to fix the scrollbar to understand
        // values in [0..1] and divide everything by wh
 
-       // estimated average paragraph height:
-       if (d->wh_ == 0)
-               d->wh_ = height_ / 4;
-
-       int h = tm.parMetrics(d->anchor_ref_).height();
-
-       // Normalize anchor/offset (MV):
-       while (d->offset_ref_ > h && d->anchor_ref_ < parsize) {
-               d->anchor_ref_++;
-               d->offset_ref_ -= h;
-               h = tm.parMetrics(d->anchor_ref_).height();
-       }
        // Look at paragraph heights on-screen
-       int sumh = 0;
-       int nh = 0;
-       for (pit_type pit = d->anchor_ref_; pit <= parsize; ++pit) {
-               if (sumh > height_)
-                       break;
-               int const h2 = tm.parMetrics(pit).height();
-               sumh += h2;
-               nh++;
+       pit_type first_visible_pit = -1;
+       pair<pit_type, ParagraphMetrics const *> first = tm.first();
+       pair<pit_type, ParagraphMetrics const *> last = tm.last();
+       for (pit_type pit = first.first; pit <= last.first; ++pit) {
+               ParagraphMetrics const & pm = tm.parMetrics(pit);
+               d->par_height_[pit] = pm.height();
+               if (first_visible_pit >= 0 || pm.position() + pm.descent() <= 0)
+                       continue;
+               first_visible_pit = pit;
+               LYXERR(Debug::SCROLLING, "first visible pit " << first_visible_pit);
+               // FIXME: we should look for the first visible row within
+               // the deepest inset!
+               int row_pos = pm.position();
+               size_t const nrows = pm.rows().size();
+               for (size_t i = 0; i != nrows; ++i) {
+                       Row const & row = pm.rows()[i];
+                       if (row_pos >= 0) {
+                               LYXERR(Debug::SCROLLING, "first visible row " << i
+                                       << "(row pos = " << row_pos << ");");
+                               break;
+                       }
+                       row_pos += row.height();
+               }
+               d->scrollbarParameters_.position = row_pos;
        }
 
-       BOOST_ASSERT(nh);
-       int const hav = sumh / nh;
-       // More realistic average paragraph height
-       if (hav > d->wh_)
-               d->wh_ = hav;
+       d->scrollbarParameters_.height = 0;
+       for (size_t i = 0; i != d->par_height_.size(); ++i) {
+               if (i == first_visible_pit)
+                       d->scrollbarParameters_.position += d->scrollbarParameters_.height;
+               d->scrollbarParameters_.height += d->par_height_[i];
+       }
 
-       BOOST_ASSERT(h);
-       d->scrollbarParameters_.height = (parsize + 1) * d->wh_;
-       d->scrollbarParameters_.position = d->anchor_ref_ * d->wh_ + int(d->offset_ref_ * d->wh_ / float(h));
-       d->scrollbarParameters_.lineScrollHeight = int(d->wh_ * defaultRowHeight() / float(h));
+       // We prefer fixed size line scrolling.
+       d->scrollbarParameters_.lineScrollHeight = defaultRowHeight();
 }
 
 
@@ -497,27 +481,58 @@ ScrollbarParameters const & BufferView::scrollbarParameters() const
 }
 
 
-void BufferView::scrollDocView(int value)
+docstring BufferView::toolTip(int x, int y) const
 {
-       LYXERR(Debug::GUI, "[ value = " << value << "]");
+       // Get inset under mouse, if there is one.
+       Inset const * covering_inset = getCoveringInset(buffer_.text(), x, y);
+       if (!covering_inset)
+               // No inset, no tooltip...
+               return docstring();
+       return covering_inset->toolTip(*this, x, y);
+}
 
-       Text & t = buffer_.text();
-       TextMetrics & tm = d->text_metrics_[&t];
 
-       float const bar = value / float(d->wh_ * t.paragraphs().size());
+docstring BufferView::contextMenu(int x, int y) const
+{
+       // Get inset under mouse, if there is one.
+       Inset const * covering_inset = getCoveringInset(buffer_.text(), x, y);
+       if (covering_inset)
+               return covering_inset->contextMenu(*this, x, y);
+
+       // FIXME: Do something more elaborate here.
+       return from_ascii("edit");
+}
+
 
-       d->anchor_ref_ = int(bar * t.paragraphs().size());
-       if (d->anchor_ref_ >  int(t.paragraphs().size()) - 1)
-               d->anchor_ref_ = int(t.paragraphs().size()) - 1;
+void BufferView::scrollDocView(int value)
+{
+       int const offset = value - d->scrollbarParameters_.position;
+       // If the offset is less than 2 screen height, prefer to scroll instead.
+       if (abs(offset) <= 2 * height_) {
+               scroll(offset);
+               return;
+       }
+
+       int par_pos = 0;
+       for (size_t i = 0; i != d->par_height_.size(); ++i) {
+               par_pos += d->par_height_[i];
+               if (par_pos >= value) {
+                       d->anchor_pit_ = pit_type(i);
+                       break;
+               }
+       }
 
-       tm.redoParagraph(d->anchor_ref_);
-       int const h = tm.parMetrics(d->anchor_ref_).height();
-       d->offset_ref_ = int((bar * t.paragraphs().size() - d->anchor_ref_) * h);
+       LYXERR(Debug::SCROLLING, "value = " << value
+               << "\tanchor_ref_ = " << d->anchor_pit_
+               << "\tpar_pos = " << par_pos);
+
+       d->anchor_ypos_ = par_pos - value;
        updateMetrics();
        buffer_.changed();
 }
 
 
+// FIXME: this method is not working well.
 void BufferView::setCursorFromScrollbar()
 {
        TextMetrics & tm = d->text_metrics_[&buffer_.text()];
@@ -650,8 +665,7 @@ bool BufferView::moveToPosition(pit_type bottom_pit, pos_type bottom_pos,
                // So we need a redraw!
                buffer_.changed();
                if (fitCursor())
-                       // We need another redraw because of the screen recentering.
-                       buffer_.changed();
+                       showCursor();
        }
 
        return success;
@@ -680,31 +694,61 @@ int BufferView::workWidth() const
 }
 
 
-void BufferView::updateOffsetRef()
+void BufferView::showCursor()
 {
-       // No need to update d->offset_ref_ in this case.
-       if (!d->need_centering_)
-               return;
-
        // We are not properly started yet, delay until resizing is
        // done.
        if (height_ == 0)
                return;
 
+       LYXERR(Debug::SCROLLING, "recentering!");
+
        CursorSlice & bot = d->cursor_.bottom();
        TextMetrics & tm = d->text_metrics_[bot.text()];
-       ParagraphMetrics const & pm = tm.parMetrics(bot.pit());
-       int y = coordOffset(d->cursor_, d->cursor_.boundary()).y_;
-       d->offset_ref_ = y + pm.ascent() - height_ / 2;
 
-       d->need_centering_ = false;
-}
+       pos_type const max_pit = pos_type(bot.text()->paragraphs().size() - 1);
+       int bot_pit = d->cursor_.bottom().pit();
+       if (bot_pit > max_pit) {
+               // FIXME: Why does this happen?
+               LYXERR0("bottom pit is greater that max pit: "
+                       << bot_pit << " > " << max_pit);
+               bot_pit = max_pit;
+       }
 
+       if (bot_pit == tm.first().first - 1)
+               tm.newParMetricsUp();
+       else if (bot_pit == tm.last().first + 1)
+               tm.newParMetricsDown();
 
-void BufferView::center()
-{
-       d->anchor_ref_ = d->cursor_.bottom().pit();
-       d->need_centering_ = true;
+       if (tm.has(bot_pit)) {
+               ParagraphMetrics const & pm = tm.parMetrics(bot_pit);
+               int offset = coordOffset(d->cursor_, d->cursor_.boundary()).y_;
+               int ypos = pm.position() + offset;
+               Dimension const & row_dim = d->cursor_.textRow().dimension();
+               if (ypos - row_dim.ascent() < 0)
+                       scrollUp(- ypos + row_dim.ascent());
+               else if (ypos + row_dim.descent() > height_)
+                       scrollDown(ypos - height_ + row_dim.descent());
+               // else, nothing to do, the cursor is already visible so we just return.
+               return;
+       }
+
+       tm.redoParagraph(bot_pit);
+       ParagraphMetrics const & pm = tm.parMetrics(bot_pit);
+       int offset = coordOffset(d->cursor_, d->cursor_.boundary()).y_;
+
+       d->anchor_pit_ = bot_pit;
+       Dimension const & row_dim = d->cursor_.textRow().dimension();
+
+       if (d->anchor_pit_ == 0)
+               d->anchor_ypos_ = offset + pm.ascent();
+       else if (d->anchor_pit_ == max_pit)
+               d->anchor_ypos_ = height_ - offset - row_dim.descent();
+       else
+               d->anchor_ypos_ = offset + pm.ascent() - height_ / 2;
+
+       updateMetrics();
+       buffer_.changed();
 }
 
 
@@ -859,56 +903,33 @@ FuncStatus BufferView::getStatus(FuncRequest const & cmd)
 }
 
 
-Update::flags BufferView::dispatch(FuncRequest const & cmd)
+bool BufferView::dispatch(FuncRequest const & cmd)
 {
-       //lyxerr << BOOST_CURRENT_FUNCTION
-       //       << [ cmd = " << cmd << "]" << endl;
+       //lyxerr << [ cmd = " << cmd << "]" << endl;
 
        // Make sure that the cached BufferView is correct.
-       LYXERR(Debug::ACTION, BOOST_CURRENT_FUNCTION
-               << " action[" << cmd.action << ']'
+       LYXERR(Debug::ACTION, " action[" << cmd.action << ']'
                << " arg[" << to_utf8(cmd.argument()) << ']'
                << " x[" << cmd.x << ']'
                << " y[" << cmd.y << ']'
                << " button[" << cmd.button() << ']');
 
        Cursor & cur = d->cursor_;
-       // Default Update flags.
-       Update::flags updateFlags = Update::Force | Update::FitCursor;
 
        switch (cmd.action) {
 
        case LFUN_UNDO:
                cur.message(_("Undo"));
                cur.clearSelection();
-               if (!cur.textUndo()) {
+               if (!cur.textUndo())
                        cur.message(_("No further undo information"));
-                       updateFlags = Update::None;
-               }
                break;
 
        case LFUN_REDO:
                cur.message(_("Redo"));
                cur.clearSelection();
-               if (!cur.textRedo()) {
+               if (!cur.textRedo())
                        cur.message(_("No further redo information"));
-                       updateFlags = Update::None;
-               }
-               break;
-
-       case LFUN_FILE_INSERT:
-               // FIXME UNICODE
-               menuInsertLyXFile(to_utf8(cmd.argument()));
-               break;
-
-       case LFUN_FILE_INSERT_PLAINTEXT_PARA:
-               // FIXME UNICODE
-               insertPlaintextFile(to_utf8(cmd.argument()), true);
-               break;
-
-       case LFUN_FILE_INSERT_PLAINTEXT:
-               // FIXME UNICODE
-               insertPlaintextFile(to_utf8(cmd.argument()), false);
                break;
 
        case LFUN_FONT_STATE:
@@ -954,12 +975,12 @@ Update::flags BufferView::dispatch(FuncRequest const & cmd)
                                if (b == &buffer_) {
                                        // Set the cursor
                                        setCursor(makeDocIterator(par, 0));
+                                       showCursor();
                                } else {
                                        // Switch to other buffer view and resend cmd
                                        theLyXFunc().dispatch(FuncRequest(
                                                LFUN_BUFFER_SWITCH, b->absFileName()));
                                        theLyXFunc().dispatch(cmd);
-                                       updateFlags = Update::None;
                                }
                                break;
                        }
@@ -1081,7 +1102,7 @@ Update::flags BufferView::dispatch(FuncRequest const & cmd)
                break;
 
        case LFUN_SCREEN_RECENTER:
-               center();
+               showCursor();
                break;
 
        case LFUN_BIBTEX_DATABASE_ADD: {
@@ -1181,13 +1202,7 @@ Update::flags BufferView::dispatch(FuncRequest const & cmd)
                Point p = getPos(cur, cur.boundary());
                if (p.y_ < 0 || p.y_ > height_) {
                        // The cursor is off-screen so recenter before proceeding.
-                       center();
-                       updateMetrics();
-                       //FIXME: updateMetrics() does not update paragraph position
-                       // This is done at draw() time. So we need a redraw!
-                       // But no screen update is needed.
-                       d->update_strategy_ = NoScreenUpdate;
-                       buffer_.changed();
+                       showCursor();
                        p = getPos(cur, cur.boundary());
                }
                scroll(cmd.action == LFUN_SCREEN_UP? - height_ : height_);
@@ -1195,13 +1210,14 @@ Update::flags BufferView::dispatch(FuncRequest const & cmd)
                d->text_metrics_[&buffer_.text()].editXY(cur, p.x_, p.y_);
                //FIXME: what to do with cur.x_target()?
                cur.finishUndo();
-               // The metrics are already up to date. see scroll()
-               updateFlags = Update::None;
                break;
        }
 
        case LFUN_SCREEN_UP_SELECT:
        case LFUN_SCREEN_DOWN_SELECT: {
+               // Those two are not ready yet for consumption.
+               return false;
+
                cur.selHandle(true);
                size_t initial_depth = cur.depth();
                Point const p = getPos(cur, cur.boundary());
@@ -1217,15 +1233,14 @@ Update::flags BufferView::dispatch(FuncRequest const & cmd)
                // But no screen update is needed.
                d->update_strategy_ = NoScreenUpdate;
                buffer_.changed();
-               updateFlags = Update::Force | Update::FitCursor;
                break;
        }
 
        default:
-               updateFlags = Update::None;
+               return false;
        }
 
-       return updateFlags;
+       return true;
 }
 
 
@@ -1271,11 +1286,15 @@ void BufferView::resize(int width, int height)
        width_ = width;
        height_ = height;
 
+       // Clear the paragraph height cache.
+       d->par_height_.clear();
+
        updateMetrics();
 }
 
 
-Inset const * BufferView::getCoveringInset(Text const & text, int x, int y)
+Inset const * BufferView::getCoveringInset(Text const & text,
+               int x, int y) const
 {
        TextMetrics & tm = d->text_metrics_[&text];
        Inset * inset = tm.checkInsetHit(x, y);
@@ -1306,7 +1325,7 @@ Inset const * BufferView::getCoveringInset(Text const & text, int x, int y)
 
 void BufferView::mouseEventDispatch(FuncRequest const & cmd0)
 {
-       //lyxerr << BOOST_CURRENT_FUNCTION << "[ cmd0 " << cmd0 << "]" << endl;
+       //lyxerr << "[ cmd0 " << cmd0 << "]" << endl;
 
        // This is only called for mouse related events including
        // LFUN_FILE_OPEN generated by drag-and-drop.
@@ -1399,7 +1418,7 @@ void BufferView::scrollDown(int offset)
        TextMetrics & tm = d->text_metrics_[text];
        int ymax = height_ + offset;
        while (true) {
-               std::pair<pit_type, ParagraphMetrics const *> last = tm.last();
+               pair<pit_type, ParagraphMetrics const *> last = tm.last();
                int bottom_pos = last.second->position() + last.second->descent();
                if (last.first + 1 == int(text->paragraphs().size())) {
                        if (bottom_pos <= height_)
@@ -1411,7 +1430,7 @@ void BufferView::scrollDown(int offset)
                        break;
                tm.newParMetricsDown();
        }
-       d->offset_ref_ += offset;
+       d->anchor_ypos_ -= offset;
        updateMetrics();
        buffer_.changed();
 }
@@ -1423,7 +1442,7 @@ void BufferView::scrollUp(int offset)
        TextMetrics & tm = d->text_metrics_[text];
        int ymin = - offset;
        while (true) {
-               std::pair<pit_type, ParagraphMetrics const *> first = tm.first();
+               pair<pit_type, ParagraphMetrics const *> first = tm.first();
                int top_pos = first.second->position() - first.second->ascent();
                if (first.first == 0) {
                        if (top_pos >= 0)
@@ -1435,7 +1454,7 @@ void BufferView::scrollUp(int offset)
                        break;
                tm.newParMetricsUp();
        }
-       d->offset_ref_ -= offset;
+       d->anchor_ypos_ += offset;
        updateMetrics();
        buffer_.changed();
 }
@@ -1461,9 +1480,9 @@ void BufferView::gotoLabel(docstring const & label)
        for (InsetIterator it = inset_iterator_begin(buffer_.inset()); it; ++it) {
                vector<docstring> labels;
                it->getLabelList(buffer_, labels);
-               if (std::find(labels.begin(), labels.end(), label) != labels.end()) {
+               if (find(labels.begin(), labels.end(), label) != labels.end()) {
                        setCursor(it);
-                       processUpdateFlags(Update::FitCursor);
+                       showCursor();
                        return;
                }
        }
@@ -1568,7 +1587,7 @@ bool BufferView::mouseSetCursor(Cursor & cur, bool select)
        // For an example, see bug 2933:
        // http://bugzilla.lyx.org/show_bug.cgi?id=2933
        // The code below could maybe be moved to a DocIterator method.
-       //lyxerr << "cur before " << cur <<std::endl;
+       //lyxerr << "cur before " << cur <<endl;
        DocIterator dit(cur.inset());
        dit.push_back(cur.bottom());
        size_t i = 1;
@@ -1576,7 +1595,7 @@ bool BufferView::mouseSetCursor(Cursor & cur, bool select)
                dit.push_back(cur[i]);
                ++i;
        }
-       //lyxerr << "5 cur after" << dit <<std::endl;
+       //lyxerr << "5 cur after" << dit <<endl;
 
        d->cursor_.setCursor(dit);
        d->cursor_.boundary(cur.boundary());
@@ -1622,7 +1641,7 @@ Cursor const & BufferView::cursor() const
 
 pit_type BufferView::anchor_ref() const
 {
-       return d->anchor_ref_;
+       return d->anchor_pit_;
 }
 
 
@@ -1646,8 +1665,7 @@ bool BufferView::singleParUpdate()
 
        d->update_strategy_ = SingleParUpdate;
 
-       LYXERR(Debug::PAINTING, BOOST_CURRENT_FUNCTION
-               << "\ny1: " << pm.position() - pm.ascent()
+       LYXERR(Debug::PAINTING, "\ny1: " << pm.position() - pm.ascent()
                << " y2: " << pm.position() + pm.descent()
                << " pit: " << bottom_pit
                << " singlepar: 1");
@@ -1660,11 +1678,6 @@ void BufferView::updateMetrics()
        Text & buftext = buffer_.text();
        pit_type const npit = int(buftext.paragraphs().size());
 
-       if (d->anchor_ref_ > int(npit - 1)) {
-               d->anchor_ref_ = int(npit - 1);
-               d->offset_ref_ = 0;
-       }
-
        // Clear out the position cache in case of full screen redraw,
        d->coord_cache_.clear();
 
@@ -1675,60 +1688,48 @@ void BufferView::updateMetrics()
 
        TextMetrics & tm = textMetrics(&buftext);
 
-       pit_type const pit = d->anchor_ref_;
-       int pit1 = pit;
-       int pit2 = pit;
-
        // Rebreak anchor paragraph.
-       tm.redoParagraph(pit);
-
-       // Take care of anchor offset if case a recentering is needed.
-       updateOffsetRef();
+       tm.redoParagraph(d->anchor_pit_);
+       ParagraphMetrics & anchor_pm = tm.par_metrics_[d->anchor_pit_];
+       anchor_pm.setPosition(d->anchor_ypos_);
 
-       int y0 = tm.parMetrics(pit).ascent() - d->offset_ref_;
+       LYXERR(Debug::PAINTING, "metrics: "
+               << " anchor pit = " << d->anchor_pit_
+               << " anchor ypos = " << d->anchor_ypos_);
 
        // Redo paragraphs above anchor if necessary.
-       int y1 = y0;
-       while (y1 > 0 && pit1 > 0) {
-               y1 -= tm.parMetrics(pit1).ascent();
-               --pit1;
+       int y1 = d->anchor_ypos_ - anchor_pm.ascent();
+       // We are now just above the anchor paragraph.
+       pit_type pit1 = d->anchor_pit_ - 1;
+       for (; pit1 >= 0 && y1 >= 0; --pit1) {
                tm.redoParagraph(pit1);
-               y1 -= tm.parMetrics(pit1).descent();
-       }
-
-       // Take care of ascent of first line
-       y1 -= tm.parMetrics(pit1).ascent();
-
-       // Normalize anchor for next time
-       d->anchor_ref_ = pit1;
-       d->offset_ref_ = -y1;
-
-       // Grey at the beginning is ugly
-       if (pit1 == 0 && y1 > 0) {
-               y0 -= y1;
-               y1 = 0;
-               d->anchor_ref_ = 0;
+               ParagraphMetrics & pm = tm.par_metrics_[pit1];
+               y1 -= pm.descent();
+               // Save the paragraph position in the cache.
+               pm.setPosition(y1);
+               y1 -= pm.ascent();
        }
 
        // Redo paragraphs below the anchor if necessary.
-       int y2 = y0;
-       while (y2 < height_ && pit2 < int(npit) - 1) {
-               y2 += tm.parMetrics(pit2).descent();
-               ++pit2;
+       int y2 = d->anchor_ypos_ + anchor_pm.descent();
+       // We are now just below the anchor paragraph.
+       pit_type pit2 = d->anchor_pit_ + 1;
+       for (; pit2 < npit && y2 <= height_; ++pit2) {
                tm.redoParagraph(pit2);
-               y2 += tm.parMetrics(pit2).ascent();
+               ParagraphMetrics & pm = tm.par_metrics_[pit2];
+               y2 += pm.ascent();
+               // Save the paragraph position in the cache.
+               pm.setPosition(y2);
+               y2 += pm.descent();
        }
 
-       // Take care of descent of last line
-       y2 += tm.parMetrics(pit2).descent();
-
-       LYXERR(Debug::PAINTING, BOOST_CURRENT_FUNCTION
-               << "\n y1: " << y1
-               << " y2: " << y2
-               << " pit1: " << pit1
-               << " pit2: " << pit2
-               << " npit: " << npit
-               << " singlepar: 0");
+       LYXERR(Debug::PAINTING, "Metrics: "
+               << " anchor pit = " << d->anchor_pit_
+               << " anchor ypos = " << d->anchor_ypos_
+               << " y1 = " << y1
+               << " y2 = " << y2
+               << " pit1 = " << pit1
+               << " pit2 = " << pit2);
 
        d->update_strategy_ = FullScreenUpdate;
 
@@ -1739,57 +1740,21 @@ void BufferView::updateMetrics()
 }
 
 
-void BufferView::menuInsertLyXFile(string const & filenm)
+void BufferView::insertLyXFile(FileName const & fname)
 {
        BOOST_ASSERT(d->cursor_.inTexted());
-       string filename = filenm;
-
-       if (filename.empty()) {
-               // Launch a file browser
-               // FIXME UNICODE
-               string initpath = lyxrc.document_path;
-               string const trypath = buffer_.filePath();
-               // If directory is writeable, use this as default.
-               if (FileName(trypath).isDirWritable())
-                       initpath = trypath;
-
-               // FIXME UNICODE
-               FileDialog dlg(_("Select LyX document to insert"), LFUN_FILE_INSERT);
-               dlg.setButton1(_("Documents|#o#O"), from_utf8(lyxrc.document_path));
-               dlg.setButton2(_("Examples|#E#e"),
-                       from_utf8(addPath(package().system_support().absFilename(),
-                       "examples")));
-
-               FileDialog::Result result =
-                       dlg.open(from_utf8(initpath),
-                                    FileFilterList(_("LyX Documents (*.lyx)")),
-                                    docstring());
-
-               if (result.first == FileDialog::Later)
-                       return;
-
-               // FIXME UNICODE
-               filename = to_utf8(result.second);
-
-               // check selected filename
-               if (filename.empty()) {
-                       // emit message signal.
-                       message(_("Canceled."));
-                       return;
-               }
-       }
 
        // Get absolute path of file and add ".lyx"
        // to the filename if necessary
-       filename = fileSearch(string(), filename, "lyx").absFilename();
+       FileName filename = fileSearch(string(), fname.absFilename(), "lyx");
 
-       docstring const disp_fn = makeDisplayPath(filename);
+       docstring const disp_fn = makeDisplayPath(filename.absFilename());
        // emit message signal.
        message(bformat(_("Inserting document %1$s..."), disp_fn));
 
        docstring res;
        Buffer buf("", false);
-       if (buf.loadLyXFile(FileName(filename))) {
+       if (buf.loadLyXFile(filename)) {
                ErrorList & el = buffer_.errorList("Parse");
                // Copy the inserted document error list into the current buffer one.
                el = buf.errorList("Parse");
@@ -1801,10 +1766,11 @@ void BufferView::menuInsertLyXFile(string const & filenm)
                res = _("Could not insert document %1$s");
        }
 
+       updateMetrics();
+       buffer_.changed();
        // emit message signal.
        message(bformat(res, disp_fn));
        buffer_.errors("Parse");
-       updateMetrics();
 }
 
 
@@ -1870,7 +1836,7 @@ Point BufferView::coordOffset(DocIterator const & dit, bool boundary) const
                int pos = sl.pos();
                if (pos && boundary)
                        --pos;
-//             lyxerr << "coordOffset: boundary:" << boundary << " depth:" << dit.depth() << " pos:" << pos << " sl.pos:" << sl.pos() << std::endl;
+//             lyxerr << "coordOffset: boundary:" << boundary << " depth:" << dit.depth() << " pos:" << pos << " sl.pos:" << sl.pos() << endl;
                rend = pm.pos2row(pos);
        } else
                rend = pm.pos2row(sl.pos());
@@ -1916,7 +1882,7 @@ void BufferView::draw(frontend::Painter & pain)
        LYXERR(Debug::PAINTING, "\t\t*** START DRAWING ***");
        Text & text = buffer_.text();
        TextMetrics const & tm = d->text_metrics_[&text];
-       int const y = - d->offset_ref_ + tm.parMetrics(d->anchor_ref_).ascent();
+       int const y = tm.first().second->position();
        PainterInfo pi(this, pain);
 
        switch (d->update_strategy_) {
@@ -1949,17 +1915,35 @@ void BufferView::draw(frontend::Painter & pain)
                // Clear background.
                pain.fillRectangle(0, 0, width_, height_,
                        buffer_.inset().backgroundColor());
+
+               // Draw everything.
                tm.draw(pi, 0, y);
 
                // and possibly grey out below
-               std::pair<pit_type, ParagraphMetrics const *> lastpm = tm.last();
+               pair<pit_type, ParagraphMetrics const *> lastpm = tm.last();
                int const y2 = lastpm.second->position() + lastpm.second->descent();
                if (y2 < height_)
                        pain.fillRectangle(0, y2, width_, height_ - y2, Color_bottomarea);
                break;
        }
-
        LYXERR(Debug::PAINTING, "\n\t\t*** END DRAWING  ***");
+
+       // The scrollbar needs an update.
+       updateScrollbar();
+
+       // Normalize anchor for next time
+       pair<pit_type, ParagraphMetrics const *> firstpm = tm.first();
+       pair<pit_type, ParagraphMetrics const *> lastpm = tm.last();
+       for (pit_type pit = firstpm.first; pit <= lastpm.first; ++pit) {
+               ParagraphMetrics const & pm = tm.parMetrics(pit);
+               if (pm.position() + pm.descent() > 0) {
+                       d->anchor_pit_ = pit;
+                       d->anchor_ypos_ = pm.position();
+                       break;
+               }
+       }
+       LYXERR(Debug::PAINTING, "Found new anchor pit = " << d->anchor_pit_
+               << "  anchor ypos = " << d->anchor_ypos_);
 }
 
 
@@ -1970,22 +1954,22 @@ void BufferView::message(docstring const & msg)
 }
 
 
-void BufferView::showDialog(std::string const & name)
+void BufferView::showDialog(string const & name)
 {
        if (d->gui_)
                d->gui_->showDialog(name, string());
 }
 
 
-void BufferView::showDialog(std::string const & name,
-       std::string const & data, Inset * inset)
+void BufferView::showDialog(string const & name,
+       string const & data, Inset * inset)
 {
        if (d->gui_)
                d->gui_->showDialog(name, data, inset);
 }
 
 
-void BufferView::updateDialog(std::string const & name, std::string const & data)
+void BufferView::updateDialog(string const & name, string const & data)
 {
        if (d->gui_)
                d->gui_->updateDialog(name, data);
@@ -1999,30 +1983,8 @@ void BufferView::setGuiDelegate(frontend::GuiBufferViewDelegate * gui)
 
 
 // FIXME: Move this out of BufferView again
-docstring BufferView::contentsOfPlaintextFile(string const & f,
-       bool asParagraph)
+docstring BufferView::contentsOfPlaintextFile(FileName const & fname)
 {
-       FileName fname(f);
-
-       if (fname.empty()) {
-               FileDialog dlg(_("Select file to insert"),
-                                  ( asParagraph
-                                    ? LFUN_FILE_INSERT_PLAINTEXT_PARA 
-                                    : LFUN_FILE_INSERT_PLAINTEXT) );
-
-               FileDialog::Result result =
-                       dlg.open(from_utf8(buffer().filePath()),
-                                    FileFilterList(), docstring());
-
-               if (result.first == FileDialog::Later)
-                       return docstring();
-
-               if (result.second.empty())
-                       return docstring();
-
-               fname = makeAbsPath(to_utf8(result.second));
-       }
-
        if (!fname.isReadableFile()) {
                docstring const error = from_ascii(strerror(errno));
                docstring const file = makeDisplayPath(fname.absFilename(), 50);
@@ -2033,36 +1995,16 @@ docstring BufferView::contentsOfPlaintextFile(string const & f,
                return docstring();
        }
 
-       ifstream ifs(fname.toFilesystemEncoding().c_str());
-       if (!ifs) {
-               docstring const error = from_ascii(strerror(errno));
+       if (!fname.isReadableFile()) {
                docstring const file = makeDisplayPath(fname.absFilename(), 50);
                docstring const text =
-                 bformat(_("Could not open the specified document\n"
-                           "%1$s\ndue to the error: %2$s"), file, error);
+                 bformat(_("%1$s\n is not readable."), file);
                Alert::error(_("Could not open file"), text);
                return docstring();
        }
 
-       ifs.unsetf(std::ios::skipws);
-       istream_iterator<char> ii(ifs);
-       istream_iterator<char> end;
-#if !defined(USE_INCLUDED_STRING) && !defined(STD_STRING_IS_GOOD)
-       // We use this until the compilers get better...
-       std::vector<char> tmp;
-       copy(ii, end, back_inserter(tmp));
-       string const tmpstr(tmp.begin(), tmp.end());
-#else
-       // This is what we want to use and what we will use once the
-       // compilers get good enough.
-       //string tmpstr(ii, end); // yet a reason for using std::string
-       // alternate approach to get the file into a string:
-       string tmpstr;
-       copy(ii, end, back_inserter(tmpstr));
-#endif
-
        // FIXME UNICODE: We don't know the encoding of the file
-       docstring file_content = from_utf8(tmpstr);
+       docstring file_content = fname.fileContents("UTF-8");
        if (file_content.empty()) {
                Alert::error(_("Reading not UTF-8 encoded file"),
                             _("The file is not UTF-8 encoded.\n"
@@ -2070,16 +2012,16 @@ docstring BufferView::contentsOfPlaintextFile(string const & f,
                               "If this does not give the correct result\n"
                               "then please change the encoding of the file\n"
                               "to UTF-8 with a program other than LyX.\n"));
-               file_content = from_local8bit(tmpstr);
+               file_content = fname.fileContents("local8bit");
        }
 
        return normalize_c(file_content);
 }
 
 
-void BufferView::insertPlaintextFile(string const & f, bool asParagraph)
+void BufferView::insertPlaintextFile(FileName const & f, bool asParagraph)
 {
-       docstring const tmpstr = contentsOfPlaintextFile(f, asParagraph);
+       docstring const tmpstr = contentsOfPlaintextFile(f);
 
        if (tmpstr.empty())
                return;
@@ -2091,6 +2033,9 @@ void BufferView::insertPlaintextFile(string const & f, bool asParagraph)
                cur.innerText()->insertStringAsParagraphs(cur, tmpstr);
        else
                cur.innerText()->insertStringAsLines(cur, tmpstr);
+
+       updateMetrics();
+       buffer_.changed();
 }
 
 } // namespace lyx