mirror of
https://git.lyx.org/repos/lyx.git
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Rewrite (again!) the code for caret drawing
The caret geometry is now computed in BufferView as a list of shapes (caret, horizontal l-shape if needed, completion triangle if needed) kept in a variable of type CaretGeometry. The code in WorkArea.cpp only has to draw these shapes. The CaretWidget (which never was a widget) in GuiWorkArea.cpp is gone now. As a consequence, the bounding box for the cursor is known precisely and therefore rows should be repainted correctly now. This avoids caret droppings. Fixes bug #12024.
This commit is contained in:
Jean-Marc Lasgouttes
parent
4487af367c
commit
1b3ffa6627
@ -53,6 +53,7 @@
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#include "mathed/MathData.h"
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#include "frontends/alert.h"
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#include "frontends/CaretGeometry.h"
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#include "frontends/Delegates.h"
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#include "frontends/FontMetrics.h"
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#include "frontends/NullPainter.h"
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@ -288,6 +289,8 @@ struct BufferView::Private
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CursorSlice current_row_slice_;
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/// are we hovering something that we can click
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bool clickable_inset_;
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/// shape of the caret
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frontend::CaretGeometry caret_geometry_;
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};
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@ -3067,10 +3070,91 @@ void BufferView::caretPosAndDim(Point & p, Dimension & dim) const
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p = getPos(cur);
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// center fat carets horizontally
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p.x_ -= dim.wid / 2;
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// p is top-left
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p.y_ -= dim.asc;
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}
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void BufferView::buildCaretGeometry(bool complet)
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{
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Point p;
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Dimension dim;
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caretPosAndDim(p, dim);
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Cursor const & cur = d->cursor_;
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Font const & realfont = cur.real_current_font;
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frontend::FontMetrics const & fm = theFontMetrics(realfont.fontInfo());
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bool const isrtl = realfont.isVisibleRightToLeft();
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int const dir = isrtl ? -1 : 1;
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frontend::CaretGeometry & cg = d->caret_geometry_;
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cg.shapes.clear();
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// The caret itself, slanted for italics in text edit mode except
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// for selections because the selection rect does not slant
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bool const slant = fm.italic() && cur.inTexted() && !cur.selection();
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double const slope = slant ? fm.italicSlope() : 0;
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cg.shapes.push_back(
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{{iround(p.x_ + dim.asc * slope), p.y_},
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{iround(p.x_ - dim.des * slope), p.y_ + dim.height()},
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{iround(p.x_ + dir * dim.wid - dim.des * slope), p.y_ + dim.height()},
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{iround(p.x_ + dir * dim.wid + dim.asc * slope), p.y_}}
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);
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// The language indicator _| (if needed)
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Language const * doclang = buffer().params().language;
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if (!((realfont.language() == doclang && isrtl == doclang->rightToLeft())
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|| realfont.language() == latex_language)) {
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int const lx = dim.height() / 3;
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int const xx = iround(p.x_ - dim.des * slope);
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int const yy = p.y_ + dim.height();
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cg.shapes.push_back(
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{{xx, yy - dim.wid},
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{xx + dir * (dim.wid + lx - 1), yy - dim.wid},
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{xx + dir * (dim.wid + lx - 1), yy},
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{xx, yy}}
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);
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}
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// The completion triangle |> (if needed)
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if (complet) {
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int const m = p.y_ + dim.height() / 2;
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int const d = dim.height() / 8;
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// offset for slanted carret
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int const sx = iround((dim.asc - (dim.height() / 2 - d)) * slope);
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// starting position x
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int const xx = p.x_ + dir * dim.wid + sx;
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cg.shapes.push_back(
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{{xx, m - d},
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{xx + dir * d, m},
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{xx, m + d},
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{xx, m + d - dim.wid},
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{xx + dir * d - dim.wid, m},
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{xx, m - d + dim.wid}}
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);
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}
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// compute extremal x values
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cg.left = 1000000;
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cg.right = -1000000;
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cg.top = 1000000;
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cg.bottom = -1000000;
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for (auto const & shape : cg.shapes)
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for (Point const & p : shape) {
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cg.left = min(cg.left, p.x_);
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cg.right = max(cg.right, p.x_);
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cg.top = min(cg.top, p.y_);
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cg.bottom = max(cg.bottom, p.y_);
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}
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}
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frontend::CaretGeometry const & BufferView::caretGeometry() const
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{
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return d->caret_geometry_;
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}
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bool BufferView::caretInView() const
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{
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if (!paragraphVisible(cursor()))
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@ -3296,19 +3380,13 @@ void BufferView::draw(frontend::Painter & pain, bool paint_caret)
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*/
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if (paint_caret) {
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Cursor cur(d->cursor_);
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Point p;
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Dimension dim;
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caretPosAndDim(p, dim);
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while (cur.depth() > 1) {
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if (cur.inTexted()) {
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TextMetrics const & tm = textMetrics(cur.text());
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if (p.x_ >= tm.origin().x_
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&& p.x_ + dim.width() <= tm.origin().x_ + tm.dim().width())
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break;
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} else {
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// in mathed
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if (!cur.inTexted())
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break;
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TextMetrics const & tm = textMetrics(cur.text());
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if (d->caret_geometry_.left >= tm.origin().x_
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&& d->caret_geometry_.right <= tm.origin().x_ + tm.dim().width())
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break;
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}
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cur.pop();
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}
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cur.textRow().changed(true);
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@ -26,6 +26,7 @@ namespace lyx {
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namespace support { class FileName; }
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namespace frontend { class CaretGeometry; }
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namespace frontend { class Painter; }
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namespace frontend { class GuiBufferViewDelegate; }
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@ -311,6 +312,10 @@ public:
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bool caretInView() const;
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/// get the position and height of the caret
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void caretPosAndDim(Point & p, Dimension & dim) const;
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/// compute the shape of the caret
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void buildCaretGeometry(bool complet);
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/// the shape of the caret
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frontend::CaretGeometry const & caretGeometry() const;
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///
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void draw(frontend::Painter & pain, bool paint_caret);
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@ -12,6 +12,7 @@ AM_CPPFLAGS += -I$(srcdir)/.. \
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liblyxfrontends_a_SOURCES = \
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alert.h \
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Application.h \
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CaretGeometry.h \
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FontLoader.h \
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FontMetrics.h \
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Delegates.h \
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@ -15,7 +15,6 @@
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#include "GuiWorkArea_Private.h"
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#include "ColorCache.h"
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#include "FontLoader.h"
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#include "GuiApplication.h"
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#include "GuiCompleter.h"
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#include "GuiKeySymbol.h"
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@ -33,7 +32,6 @@
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#include "Font.h"
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#include "FuncRequest.h"
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#include "KeySymbol.h"
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#include "Language.h"
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#include "LyX.h"
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#include "LyXRC.h"
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#include "LyXVC.h"
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@ -51,6 +49,8 @@
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#include "support/TempFile.h"
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#include "frontends/Application.h"
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#include "frontends/CaretGeometry.h"
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#include "frontends/FontMetrics.h"
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#include "frontends/WorkAreaManager.h"
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@ -125,100 +125,6 @@ mouse_button::state q_motion_state(Qt::MouseButtons state)
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namespace frontend {
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class CaretWidget {
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public:
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CaretWidget() : dir(1), l_shape(false), completable(false),
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x(0), y(0), slope(0)
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{}
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/* Draw the caret. Parameter \c horiz_offset is not 0 when there
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* has been horizontal scrolling in current row
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*/
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void draw(QPainter & painter, int horiz_offset)
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{
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if (dim.empty())
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return;
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// correction for horizontal scrolling
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int const xx = x - horiz_offset;
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int const lx = dim.height() / 3;
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// draw caret box
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painter.setPen(color);
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QPainterPath path;
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path.moveTo(xx + dim.asc * slope, y);
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path.lineTo(xx - dim.des * slope, y + dim.height());
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path.lineTo(xx + dir * dim.wid - dim.des * slope, y + dim.height());
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path.lineTo(xx + dir * dim.wid + dim.asc * slope, y);
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painter.setRenderHint(QPainter::Antialiasing, true);
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painter.fillPath(path, color);
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painter.setRenderHint(QPainter::Antialiasing, false);
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// draw RTL/LTR indication
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if (l_shape)
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painter.fillRect(xx - dim.des * slope,
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y + dim.height() - dim.wid + 1,
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dir * (dim.wid + lx - 1), dim.wid, color);
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// draw completion triangle
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if (completable) {
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int const m = y + dim.height() / 2;
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int const d = dim.height() / 8;
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// offset for slanted carret
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int const sx = (dim.asc - (dim.height() / 2 - d)) * slope;
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painter.setPen(QPen(color, dim.width()));
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painter.drawLine(xx + dir * dim.wid + sx, m - d,
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xx + dir * (dim.wid + d) + sx, m);
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painter.drawLine(xx + dir * dim.wid + sx, m + d,
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xx + dir * (dim.wid + d) + sx, m);
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}
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}
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void update(BufferView const * bv, bool complet) {
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// Cursor size and position
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Point point;
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bv->caretPosAndDim(point, dim);
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x = point.x_;
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y = point.y_;
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completable = complet;
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Cursor const & cur = bv->cursor();
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Font const & realfont = cur.real_current_font;
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FontMetrics const & fm = theFontMetrics(realfont.fontInfo());
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BufferParams const & bp = bv->buffer().params();
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bool const samelang = realfont.language() == bp.language;
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bool const isrtl = realfont.isVisibleRightToLeft();
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dir = isrtl ? -1 : 1;
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// special shape
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l_shape = (!samelang || isrtl != bp.language->rightToLeft())
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&& realfont.language() != latex_language;
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// use slanted caret for italics in text edit mode
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// except for selections because the selection rect does not slant
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bool const slant = fm.italic() && cur.inTexted() && !cur.selection();
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slope = slant ? fm.italicSlope() : 0;
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color = guiApp->colorCache().get(Color_cursor);
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}
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/// text direction (1 for LtR, -1 for RtL)
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int dir;
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/// indication for language change
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bool l_shape;
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/// triangle to show that a completion is available
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bool completable;
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///
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QColor color;
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/// dimension uf base caret
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Dimension dim;
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/// x position (were the vertical line is drawn)
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int x;
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/// y position (the top of the caret)
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int y;
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/// the slope for drawing slanted caret
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double slope;
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};
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// This is a 'heartbeat' generating synthetic mouse move events when the
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// cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
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SyntheticMouseEvent::SyntheticMouseEvent()
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@ -227,7 +133,7 @@ SyntheticMouseEvent::SyntheticMouseEvent()
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GuiWorkArea::Private::Private(GuiWorkArea * parent)
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: p(parent), buffer_view_(nullptr), lyx_view_(nullptr), caret_(nullptr),
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: p(parent), buffer_view_(nullptr), lyx_view_(nullptr),
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caret_visible_(false), need_resize_(false), preedit_lines_(1),
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last_pixel_ratio_(1.0), completer_(new GuiCompleter(p, p)),
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dialog_mode_(false), shell_escape_(false), read_only_(false),
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@ -266,7 +172,6 @@ GuiWorkArea::Private::~Private()
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buffer_view_->buffer().workAreaManager().remove(p);
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} catch(...) {}
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delete buffer_view_;
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delete caret_;
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// Completer has a QObject parent and is thus automatically destroyed.
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// See #4758.
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// delete completer_;
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@ -316,7 +221,6 @@ void GuiWorkArea::init()
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// With Qt4.5 a mouse event will happen before the first paint event
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// so make sure that the buffer view has an up to date metrics.
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d->buffer_view_->resize(viewport()->width(), viewport()->height());
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d->caret_ = new frontend::CaretWidget();
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setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
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setAcceptDrops(true);
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@ -606,7 +510,7 @@ void GuiWorkArea::Private::resetCaret()
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&& !completer_->popupVisible()
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&& !completer_->inlineVisible();
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caret_->update(buffer_view_, completable);
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buffer_view_->buildCaretGeometry(completable);
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needs_caret_geometry_update_ = true;
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caret_visible_ = true;
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@ -647,6 +551,33 @@ void GuiWorkArea::Private::hideCaret()
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}
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/* Draw the caret. Parameter \c horiz_offset is not 0 when there
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* has been horizontal scrolling in current row
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*/
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void GuiWorkArea::Private::drawCaret(QPainter & painter, int horiz_offset) const
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{
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if (buffer_view_->caretGeometry().shapes.empty())
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return;
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QColor const color = guiApp->colorCache().get(Color_cursor);
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painter.setPen(color);
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painter.setRenderHint(QPainter::Antialiasing, true);
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for (auto const & shape : buffer_view_->caretGeometry().shapes) {
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bool first = true;
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QPainterPath path;
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for (Point const & p : shape) {
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if (first) {
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path.moveTo(p.x_ - horiz_offset, p.y_);
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first = false;
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} else
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path.lineTo(p.x_ - horiz_offset, p.y_);
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}
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painter.fillPath(path, color);
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}
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painter.setRenderHint(QPainter::Antialiasing, false);
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}
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void GuiWorkArea::Private::updateScrollbar()
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{
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// Prevent setRange() and setSliderPosition from causing recursive calls via
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@ -1194,9 +1125,11 @@ void GuiWorkArea::Private::paintPreeditText(GuiPainter & pain)
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// FIXME: shall we use real_current_font here? (see #10478)
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FontInfo const font = buffer_view_->cursor().getFont().fontInfo();
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FontMetrics const & fm = theFontMetrics(font);
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int const height = fm.maxHeight();
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int cur_x = caret_->x;
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int cur_y = caret_->y + height;
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Point point;
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Dimension dim;
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buffer_view_->caretPosAndDim(point, dim);
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int cur_x = point.x_;
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int cur_y = point.y_ + dim.height();
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// get attributes of input method cursor.
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// cursor_pos : cursor position in preedit string.
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@ -1249,7 +1182,7 @@ void GuiWorkArea::Private::paintPreeditText(GuiPainter & pain)
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// if we reached the right extremity of the screen, go to next line.
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if (cur_x + fm.width(typed_char) > p->viewport()->width() - right_margin) {
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cur_x = right_margin;
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cur_y += height + 1;
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cur_y += dim.height() + 1;
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++preedit_lines_;
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}
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// preedit strings are displayed with dashed underline
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@ -1347,7 +1280,7 @@ void GuiWorkArea::paintEvent(QPaintEvent * ev)
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if (d->caret_visible_) {
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if (d->needs_caret_geometry_update_)
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d->updateCaretGeometry();
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d->caret_->draw(pain, d->buffer_view_->horizScrollOffset());
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d->drawCaret(pain, d->buffer_view_->horizScrollOffset());
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}
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d->updateScreen(ev->rect());
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@ -1390,10 +1323,11 @@ void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
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// redraw area of preedit string.
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int height = d->caret_->dim.height();
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int cur_y = d->caret_->y;
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viewport()->update(0, cur_y, viewport()->width(),
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(height + 1) * d->preedit_lines_);
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// int height = d->caret_->dim.height();
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// int cur_y = d->caret_->y;
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// viewport()->update(0, cur_y, viewport()->width(),
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// (height + 1) * d->preedit_lines_);
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viewport()->update();
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if (d->preedit_string_.empty()) {
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d->preedit_lines_ = 1;
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@ -1411,12 +1345,14 @@ QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
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switch (query) {
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// this is the CJK-specific composition window position and
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// the context menu position when the menu key is pressed.
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case Qt::ImMicroFocus:
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return QRect(d->caret_->x - 10 * (d->preedit_lines_ != 1),
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d->caret_->y + d->caret_->dim.height() * d->preedit_lines_,
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d->caret_->dim.width(), d->caret_->dim.height());
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default:
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return QWidget::inputMethodQuery(query);
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case Qt::ImMicroFocus: {
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CaretGeometry const & cg = bufferView().caretGeometry();
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return QRect(cg.left - 10 * (d->preedit_lines_ != 1),
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cg.top + cg.height() * d->preedit_lines_,
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cg.width(), cg.height());
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}
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default:
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return QWidget::inputMethodQuery(query);
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}
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}
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@ -68,7 +68,6 @@ public:
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/**
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* Implementation of the work area (buffer view GUI)
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*/
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class CaretWidget;
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struct GuiWorkArea::Private
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{
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@ -91,6 +90,10 @@ struct GuiWorkArea::Private
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void showCaret();
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/// hide the caret if it is visible
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void hideCaret();
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/* Draw the caret. Parameter \c horiz_offset is not 0 when there
|
||||
* has been horizontal scrolling in current row
|
||||
*/
|
||||
void drawCaret(QPainter & painter, int horiz_offset) const;
|
||||
/// Set the range and value of the scrollbar and connect to its valueChanged
|
||||
/// signal.
|
||||
void updateScrollbar();
|
||||
@ -118,8 +121,6 @@ struct GuiWorkArea::Private
|
||||
///
|
||||
QImage screen_;
|
||||
|
||||
///
|
||||
CaretWidget * caret_;
|
||||
/// is the caret currently displayed
|
||||
bool caret_visible_;
|
||||
///
|
||||
|
||||
Loading…
Reference in New Issue
Block a user