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Cleanup the caret geometry code

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Intended changes:

* code is shorter and cleaner

* caret scales better with zoom when cursor_width=0: completion
  indicator, l-shaped cursor...

Details:

* Rename BufferView::getPosAndHeight to getPosAndDim because ascent is
  needed too and width could in the future be set depending on font.

* Get rid of rect_ in CaretWidget and record a Dimension (and y value) instead.
  Remove also caret_width_ and slant_, replace rtl_ with dir.

* Make CaretWidget members public and lose the trailing _.

* change CaretWidget::update to read its parameters from current bufferview.
This commit is contained in:
Jean-Marc Lasgouttes 2020-10-01 13:17:01 +02:00
parent 7d96531909
commit 7f1b1729b4
4 changed files with 96 additions and 149 deletions
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25
src/BufferView.cpp
View File

@ -3062,23 +3062,26 @@ bool BufferView::paragraphVisible(DocIterator const & dit) const
}
void BufferView::caretPosAndHeight(Point & p, int & h) const
void BufferView::caretPosAndDim(Point & p, Dimension & dim) const
{
int asc, des;
Cursor const & cur = cursor();
if (cur.inMathed()) {
MathRow const & mrow = mathRow(&cur.cell());
asc = mrow.caret_ascent;
des = mrow.caret_descent;
dim.asc = mrow.caret_ascent;
dim.des = mrow.caret_descent;
} else {
Font const font = cur.real_current_font;
frontend::FontMetrics const & fm = theFontMetrics(font);
asc = fm.maxAscent();
des = fm.maxDescent();
dim.asc = fm.maxAscent();
dim.des = fm.maxDescent();
}
h = asc + des;
if (lyxrc.cursor_width > 0)
dim.wid = lyxrc.cursor_width;
else
dim.wid = 1 + int((lyxrc.currentZoom + 50) / 200.0);
p = getPos(cur);
p.y_ -= asc;
p.y_ -= dim.asc;
}
@ -3087,11 +3090,11 @@ bool BufferView::caretInView() const
if (!paragraphVisible(cursor()))
return false;
Point p;
int h;
caretPosAndHeight(p, h);
Dimension dim;
caretPosAndDim(p, dim);
// does the cursor touch the screen ?
if (p.y_ + h < 0 || p.y_ >= workHeight())
if (p.y_ + dim.height() < 0 || p.y_ >= workHeight())
return false;
return true;
}

3
src/BufferView.h
View File

@ -34,6 +34,7 @@ class Change;
class CoordCache;
class Cursor;
class CursorSlice;
class Dimension;
class DispatchResult;
class DocIterator;
class DocumentClass;
@ -313,7 +314,7 @@ public:
/// is the caret currently visible in the view
bool caretInView() const;
/// get the position and height of the caret
void caretPosAndHeight(Point & p, int & h) const;
void caretPosAndDim(Point & p, Dimension & dim) const;
///
void draw(frontend::Painter & pain, bool paint_caret);

1
src/LyXRC.h
View File

@ -558,6 +558,7 @@ public:
};
///
ScrollWheelZoom scroll_wheel_zoom = SCROLL_WHEEL_ZOOM_CTRL;
// FIXME: should be caret_width
///
int cursor_width = 1;
/// One of: yes, no, ask

216
src/frontends/qt/GuiWorkArea.cpp
View File

@ -129,8 +129,8 @@ namespace frontend {
class CaretWidget {
public:
CaretWidget() : rtl_(false), l_shape_(false), completable_(false),
x_(0), caret_width_(0), slant_(false), ascent_(0), slope_(0)
CaretWidget() : dir(1), l_shape(false), completable(false),
x(0), y(0), slope(0)
{}
/* Draw the caret. Parameter \c horiz_offset is not 0 when there
@ -138,116 +138,86 @@ public:
*/
void draw(QPainter & painter, int horiz_offset)
{
if (!rect_.isValid())
if (dim.empty())
return;
int const x = x_ - horiz_offset;
int const y = rect_.top();
int const lx = rtl_ ? x_ - rect_.left() : rect_.right() - x_;
int const bot = rect_.bottom();
int const dir = rtl_ ? -1 : 1;
// correction is (1) for horizontal scrolling and (2) for
// better positionning of large cursors.
int const xx = x - horiz_offset - dim.wid / 2;
int const lx = dim.height() / 3;
// draw caret box
if (slant_ && !rtl_) {
// slanted
QPainterPath path;
path.moveTo(x + ascent_ * slope_, y);
path.lineTo(x - (rect_.height() - ascent_) * slope_,
y + rect_.height());
path.lineTo(x + dir * caret_width_ - (rect_.height() - ascent_) * slope_,
y + rect_.height());
path.lineTo(x + dir * caret_width_ + ascent_ * slope_, y);
painter.setRenderHint(QPainter::Antialiasing, true);
painter.fillPath(path, color_);
painter.setRenderHint(QPainter::Antialiasing, false);
} else
// regular
painter.fillRect(x, y, dir * caret_width_, rect_.height(), color_);
painter.setPen(color);
QPainterPath path;
path.moveTo(xx + dim.asc * slope, y);
path.lineTo(xx - dim.des * slope, y + dim.height());
path.lineTo(xx + dir * dim.wid - dim.des * slope, y + dim.height());
path.lineTo(xx + dir * dim.wid + dim.asc * slope, y);
painter.setRenderHint(QPainter::Antialiasing, true);
painter.fillPath(path, color);
painter.setRenderHint(QPainter::Antialiasing, false);
// draw RTL/LTR indication
painter.setPen(color_);
if (l_shape_) {
painter.drawLine(x, bot, x + dir * (caret_width_ + lx - 1), bot);
}
if (l_shape)
painter.fillRect(xx - dim.des * slope,
y + dim.height() - dim.wid + 1,
dir * (dim.wid + lx - 1), dim.wid, color);
// draw completion triangle
if (completable_) {
int const m = y + rect_.height() / 2;
int const d = TabIndicatorWidth - 1;
if (completable) {
int const m = y + dim.height() / 2;
int const d = TabIndicatorWidth * dim.wid - 1;
// offset for slanted carret
int const sx = (slant_ && !rtl_) ? (ascent_ - (rect_.height() / 2 - d)) * slope_ : 0;
painter.drawLine(x + dir * (caret_width_ + 1) + sx, m - d,
x + dir * (caret_width_ + d + 1) + sx, m);
painter.drawLine(x + dir * (caret_width_ + 1) + sx, m + d,
x + dir * (caret_width_ + d + 1) + sx, m);
int const sx = (dim.asc - (dim.height() / 2 - d)) * slope;
painter.drawLine(xx + dir * (dim.wid + 1) + sx, m - d,
xx + dir * (dim.wid + d + 1) + sx, m);
painter.drawLine(xx + dir * (dim.wid + 1) + sx, m + d,
xx + dir * (dim.wid + d + 1) + sx, m);
}
}
void update(int x, int y, int h, bool l_shape,
bool rtl, bool completable, bool slant, int ascent, double slope)
{
color_ = guiApp->colorCache().get(Color_cursor);
l_shape_ = l_shape;
rtl_ = rtl;
completable_ = completable;
x_ = x;
slant_ = slant;
ascent_ = ascent;
slope_ = slope;
void update(BufferView const * bv, bool complet) {
// Cursor size and position
Point point;
bv->caretPosAndDim(point, dim);
x = point.x_;
y = point.y_;
completable = complet;
// extension to left and right
int l = 0;
int r = 0;
Cursor const & cur = bv->cursor();
Font const & realfont = cur.real_current_font;
FontMetrics const & fm = theFontMetrics(realfont.fontInfo());
BufferParams const & bp = bv->buffer().params();
bool const samelang = realfont.language() == bp.language;
bool const isrtl = realfont.isVisibleRightToLeft();
dir = isrtl ? -1 : 1;
// special shape
l_shape = (!samelang || isrtl != bp.language->rightToLeft())
&& realfont.language() != latex_language;
// RTL/LTR indication
if (l_shape_) {
if (rtl)
l += h / 3;
else
r += h / 3;
}
// use slanted caret for italics in text edit mode
// except for selections because the selection rect does not slant
bool const slant = fm.italic() && cur.inTexted() && !cur.selection();
slope = slant ? fm.italicSlope() : 0;
// completion triangle
if (completable_) {
if (rtl)
l = max(l, TabIndicatorWidth);
else
r = max(r, TabIndicatorWidth);
}
//FIXME: LyXRC::cursor_width should be caret_width
caret_width_ = lyxrc.cursor_width
? lyxrc.cursor_width
: 1 + int((lyxrc.currentZoom + 50) / 200.0);
// compute overall rectangle
rect_ = QRect(x - l, y, caret_width_ + r + l, h);
color = guiApp->colorCache().get(Color_cursor);
}
QRect const & rect() { return rect_; }
private:
/// caret is in RTL or LTR text
bool rtl_;
/// indication for RTL or LTR
bool l_shape_;
/// text direction (1 for LtR, -1 for RtL)
int dir;
/// indication for language change
bool l_shape;
/// triangle to show that a completion is available
bool completable_;
bool completable;
///
QColor color_;
/// rectangle, possibly with l_shape and completion triangle
QRect rect_;
QColor color;
/// dimension uf base caret
Dimension dim;
/// x position (were the vertical line is drawn)
int x_;
/// the width of the vertical blinking bar
int caret_width_;
/// caret is in slanted text
bool slant_;
/// the fontmetrics ascent for drawing slanted caret
int ascent_;
int x;
/// y position (the top of the caret)
int y;
/// the slope for drawing slanted caret
double slope_;
double slope;
};
@ -631,6 +601,15 @@ void GuiWorkArea::Private::resetCaret()
if (!buffer_view_->caretInView())
return;
// completion indicator
Cursor const & cur = buffer_view_->cursor();
bool const completable = cur.inset().showCompletionCursor()
&& completer_->completionAvailable()
&& !completer_->popupVisible()
&& !completer_->inlineVisible();
caret_->update(buffer_view_, completable);
needs_caret_geometry_update_ = true;
caret_visible_ = true;
}
@ -644,40 +623,7 @@ void GuiWorkArea::Private::updateCaretGeometry()
|| !buffer_view_->caretInView())
return;
Point point;
int h = 0;
buffer_view_->caretPosAndHeight(point, h);
Cursor & cur = buffer_view_->cursor();
// RTL or not RTL
bool l_shape = false;
Font const & realfont = cur.real_current_font;
FontMetrics const & fm = theFontMetrics(realfont.fontInfo());
BufferParams const & bp = buffer_view_->buffer().params();
bool const samelang = realfont.language() == bp.language;
bool const isrtl = realfont.isVisibleRightToLeft();
if (!samelang || isrtl != bp.language->rightToLeft())
l_shape = true;
// The ERT language hack needs fixing up
if (realfont.language() == latex_language)
l_shape = false;
// show caret on screen
bool completable = cur.inset().showCompletionCursor()
&& completer_->completionAvailable()
&& !completer_->popupVisible()
&& !completer_->inlineVisible();
// use slanted caret for italics in text edit mode
// except for selections because the selection rect does not slant
int slant = fm.italic() && buffer_view_->cursor().inTexted()
&& !buffer_view_->cursor().selection();
double slope = fm.italicSlope();
caret_->update(point.x_, point.y_, h, l_shape, isrtl, completable, slant,
fm.maxAscent(), slope);
needs_caret_geometry_update_ = false;
}
@ -1252,8 +1198,8 @@ void GuiWorkArea::Private::paintPreeditText(GuiPainter & pain)
FontInfo const font = buffer_view_->cursor().getFont().fontInfo();
FontMetrics const & fm = theFontMetrics(font);
int const height = fm.maxHeight();
int cur_x = caret_->rect().left();
int cur_y = caret_->rect().bottom();
int cur_x = caret_->x;
int cur_y = caret_->y + height;
// get attributes of input method cursor.
// cursor_pos : cursor position in preedit string.
@ -1447,9 +1393,9 @@ void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
// redraw area of preedit string.
int height = d->caret_->rect().height();
int cur_y = d->caret_->rect().bottom();
viewport()->update(0, cur_y - height, viewport()->width(),
int height = d->caret_->dim.height();
int cur_y = d->caret_->y;
viewport()->update(0, cur_y, viewport()->width(),
(height + 1) * d->preedit_lines_);
if (d->preedit_string_.empty()) {
@ -1470,13 +1416,9 @@ QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
// this is the CJK-specific composition window position and
// the context menu position when the menu key is pressed.
case Qt::ImMicroFocus:
cur_r = d->caret_->rect();
if (d->preedit_lines_ != 1)
cur_r.moveLeft(10);
cur_r.moveBottom(cur_r.bottom()
+ cur_r.height() * (d->preedit_lines_ - 1));
// return lower right of caret in LyX.
return cur_r;
return QRect(d->caret_->x - 10 * (d->preedit_lines_ != 1),
d->caret_->y + d->caret_->dim.height() * d->preedit_lines_,
d->caret_->dim.width(), d->caret_->dim.height());
default:
return QWidget::inputMethodQuery(query);
}