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Add ScrollType BOTTOM and TOGGLE for BufferView::scrollToCursor()
BOTTOM shows the paragraph containing the cursor at the bottom of the work area. TOGGLE does CENTER, then TOP, BOTTOM and finally cycles to CENTER. This is a feature copied from emacs's C-l binding. Add new argument "caret" to lfun "scroll" that can be used like scroll caret center Change the keys (either C-l, M-l or F5) bound to screen-recenter to "scroll caret toggle". As an experiment, change paragraph-goto to use this scrolling method. This can be tested when going to a heading in the outline pane.
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@ -120,7 +120,7 @@ Format 5
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\bind "C-F3" "search-string-set"
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\bind "C-F4" "buffer-close"
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\bind "M-F4" "lyx-quit"
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\bind "F5" "screen-recenter"
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\bind "F5" "scroll caret toggle"
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\bind "C-M-Up" "scroll line up"
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\bind "C-M-Down" "scroll line down"
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\bind "C-M-Prior" "scroll page up"
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@ -42,7 +42,7 @@ Format 5
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\bind "C-i" "space-insert hfill"
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\bind "C-j" "paragraph-break"
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\bind "C-k" "line-delete-forward"
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\bind "C-l" "screen-recenter"
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\bind "C-l" "scroll caret toggle"
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\bind "C-m" "mark-toggle"
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\bind "C-n" "down"
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\bind "C-o" "inset-toggle"
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@ -63,8 +63,8 @@ Format 5
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# -: "Control-K" # Delete from the character in front of the cursor to the end of the line/paragraph
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# used by menu.bind - keymap
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# +: "Control-L" # Center the cursor/selection in the visible area
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\bind "M-l" "screen-recenter"
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\bind "F5" "screen-recenter"
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\bind "M-l" "scroll caret toggle"
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\bind "F5" "scroll caret toggle"
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# +: "Control-N" # Move down one line
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\bind "M-n" "down"
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# +: "Control-O" # Insert a new line after the cursor
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@ -79,7 +79,7 @@ Format 5
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#\bind "C-j" "------"
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\bind "C-k" "line-delete-forward"
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\bind "C-j" "screen-recenter"
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\bind "C-j" "scroll caret toggle"
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\bind "C-S-I" "info-insert"
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# Toggle: in text mode, switch to math, and vice versa. Also C-t.
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@ -44,7 +44,7 @@ Format 5
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\bind "C-i" "space-insert hfill"
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#bind "C-j" "------"
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\bind "C-k" "line-delete-forward"
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\bind "C-l" "screen-recenter"
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\bind "C-l" "scroll caret toggle"
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\bind "C-m" "mark-toggle"
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\bind "C-n" "down"
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\bind "C-o" "inset-toggle"
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@ -1015,9 +1015,9 @@ void BufferView::recenter()
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}
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void BufferView::showCursor()
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void BufferView::showCursor(ScrollType how)
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{
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showCursor(d->cursor_, SCROLL_VISIBLE);
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showCursor(d->cursor_, how);
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}
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@ -1038,6 +1038,10 @@ bool BufferView::scrollToCursor(DocIterator const & dit, ScrollType how)
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LYXERR(Debug::SCROLLING, "Centering cursor in workarea");
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else if (how == SCROLL_TOP)
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LYXERR(Debug::SCROLLING, "Setting cursor to top of workarea");
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else if (how == SCROLL_BOTTOM)
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LYXERR(Debug::SCROLLING, "Setting cursor to bottom of workarea");
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else if (how == SCROLL_TOGGLE)
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LYXERR(Debug::SCROLLING, "Alternate cursor position between center, top and bottom");
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else
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LYXERR(Debug::SCROLLING, "Making sure cursor is visible in workarea");
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@ -1115,6 +1119,7 @@ bool BufferView::scrollToCursor(DocIterator const & dit, ScrollType how)
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int const ypos_center = height_/2 - row_dim.height() / 2 + row_dim.ascent() - offset;
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int const ypos_top = (offset > height_) ? height_ - offset - defaultRowHeight()
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: defaultRowHeight() * 2;
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int const ypos_bottom = height_ - offset - defaultRowHeight();
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// Select the right one.
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d->anchor_pit_ = bot_pit;
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@ -1125,7 +1130,24 @@ bool BufferView::scrollToCursor(DocIterator const & dit, ScrollType how)
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case SCROLL_TOP:
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case SCROLL_VISIBLE:
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d->anchor_ypos_ = ypos_top;
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// more to come: BOTTOM, TOGGLE
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break;
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case SCROLL_BOTTOM:
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d->anchor_ypos_ = ypos_bottom;
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break;
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case SCROLL_TOGGLE: {
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ParagraphMetrics const & bot_pm = tm.parMetrics(bot_pit);
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if (!bot_pm.hasPosition()) {
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d->anchor_ypos_ = ypos_center;
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break;
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}
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int const ypos = bot_pm.position();
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if (ypos == ypos_center)
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d->anchor_ypos_ = ypos_top;
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else if (ypos == ypos_top)
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d->anchor_ypos_ = ypos_bottom;
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else
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d->anchor_ypos_ = ypos_center;
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}
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}
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return d->anchor_ypos_ != old_ypos || d->anchor_pit_ != old_pit;
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@ -1657,7 +1679,7 @@ void BufferView::dispatch(FuncRequest const & cmd, DispatchResult & dr)
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success = setCursorFromEntries({id, pos},
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{id_end, pos_end});
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}
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if (success && scrollToCursor(d->cursor_, SCROLL_TOP))
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if (success && scrollToCursor(d->cursor_, SCROLL_TOGGLE))
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dr.screenUpdate(Update::Force);
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} else {
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// Switch to other buffer view and resend cmd
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@ -2164,6 +2186,27 @@ void BufferView::dispatch(FuncRequest const & cmd, DispatchResult & dr)
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case LFUN_SCROLL: {
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string const scroll_type = cmd.getArg(0);
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if (scroll_type == "caret") {
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string const where = cmd.getArg(1);
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ScrollType how;
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if (where == "top")
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how = SCROLL_TOP;
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else if (where == "center")
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how = SCROLL_CENTER;
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else if (where == "bottom")
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how = SCROLL_BOTTOM;
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else if (where == "toggle")
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how = SCROLL_TOGGLE;
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else if (where == "visible")
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how = SCROLL_VISIBLE;
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else {
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dispatched = false;
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break;
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}
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showCursor(how);
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break;
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}
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int scroll_step = 0;
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if (scroll_type == "line")
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scroll_step = d->scrollbarParameters_.single_step;
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@ -2171,7 +2214,7 @@ void BufferView::dispatch(FuncRequest const & cmd, DispatchResult & dr)
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scroll_step = d->scrollbarParameters_.page_step;
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else {
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dispatched = false;
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return;
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break;
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}
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string const scroll_quantity = cmd.getArg(1);
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@ -2184,7 +2227,7 @@ void BufferView::dispatch(FuncRequest const & cmd, DispatchResult & dr)
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scroll(scroll_step * convert<int>(scroll_quantity));
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else {
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dispatched = false;
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return;
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break;
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}
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dr.screenUpdate(Update::ForceDraw);
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@ -61,10 +61,14 @@ enum CursorStatus {
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enum ScrollType {
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// Make sure row if visible (do nothing if it is visible already)
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SCROLL_VISIBLE,
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// Force cursor to be on top of screen
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// Cursor on top of screen
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SCROLL_TOP,
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// Force cursor to be at center of screen
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SCROLL_CENTER
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// Cursor at center of screen
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SCROLL_CENTER,
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// Cursor at bottom of the screen
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SCROLL_BOTTOM,
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// Alternate between center, top, bottom, center, etc.
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SCROLL_TOGGLE
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};
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/// Scrollbar Parameters.
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@ -213,18 +217,18 @@ public:
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/// Ensure that the BufferView cursor is visible.
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/// This method will automatically scroll and update the BufferView
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/// (metrics+drawing) if needed.
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void showCursor();
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/// \param how: where the cursor should appear (visible, top, center...)
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void showCursor(ScrollType how = SCROLL_VISIBLE);
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/// Ensure the passed cursor \p dit is visible.
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/// This method will automatically scroll and update the BufferView
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/// (metrics+drawing) if needed.
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/// \param how: where the cursor should appear (visible/top/center)
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/// \param how: where the cursor should appear (visible, top, center...)
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void showCursor(DocIterator const & dit, ScrollType how);
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/// Scroll to the cursor.
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/// This only updates the anchor vertical position, but does not
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/// recompute metrics nor trigger a screen refresh.
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/// \param how: where the cursor should appear (visible/top/center)
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/// \return true if screen was scrolled
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/// \param how: where the cursor should appear (visible, top, center...)
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bool scrollToCursor(DocIterator const & dit, ScrollType how);
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/// scroll the view by the given number of pixels. This only
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/// updates the anchor vertical position, but does not recompute
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@ -3657,8 +3657,9 @@ void LyXAction::init()
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* \li Action: Scroll the buffer view.
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* \li Notion: Only scrolls the screen up or down; does not move the cursor.
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* \li Syntax: scroll <TYPE> <QUANTITY>
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* \li Params: <TYPE>: line|page\n
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<QUANTITY>: up|down|<number>
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* \li Params: <TYPE>: line|page|caret\n
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<QUANTITY>: top|center|bottom|toggle [if <TYPE> is caret]
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<QUANTITY>: up|down|<number> [otherwise]
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* \li Origin: Abdel, Dec 27 2007
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* \endvar
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*/
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