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QTextCursor: Use RasterOp_NotDestination composition mode for drawing the cursor

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This has several advantages over the current “fill the rectangle with the
default text color” approach:

- When the background color for some block of text is black, the cursor will be
  white and visible.

- It is possible to set the cursor width to width of a character (for example
  for monospace edits), and the characters will be visible when the cursor is
  displayed.

Change-Id: I2e6303166d5d63c8dd11ec4fcf3d734cdf440e7e
Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@theqtcompany.com>
This commit is contained in:
Dmitry Shachnev 2016-02-08 10:43:21 +03:00 committed by Konstantin Ritt
parent d64f078173
commit 9692534de6
1 changed files with 4 additions and 0 deletions
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4
src/gui/text/qtextlayout.cpp
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@ -1326,7 +1326,11 @@ void QTextLayout::drawCursor(QPainter *p, const QPointF &pos, int cursorPosition
&& (p->transform().type() > QTransform::TxTranslate);
if (toggleAntialiasing)
p->setRenderHint(QPainter::Antialiasing);
QPainter::CompositionMode origCompositionMode = p->compositionMode();
if (p->paintEngine()->hasFeature(QPaintEngine::RasterOpModes))
p->setCompositionMode(QPainter::RasterOp_NotDestination);
p->fillRect(QRectF(x, y, qreal(width), (base + descent).toReal()), p->pen().brush());
p->setCompositionMode(origCompositionMode);
if (toggleAntialiasing)
p->setRenderHint(QPainter::Antialiasing, false);
if (d->layoutData->hasBidi) {