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statistics: turn infobox into a QSGNode

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A small step in converting from QGraphicsScene to QQuickItem.
This is the second item to be converted (after the legend)
and for now items are drawn in order of creation, which means
that the infobox is on top of the legend. This will have
to be made deterministic in follow-up commits.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2021-01-13 15:17:54 +01:00 • committed by bstoeger
parent d7878dad36
commit 785d5189f6
8 changed files with 53 additions and 58 deletions
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65
stats/informationbox.cpp
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@ -1,9 +1,9 @@
#include "informationbox.h"
#include "statscolors.h"
#include "statsview.h"
#include "zvalues.h"
#include <QFontMetrics>
#include <QGraphicsScene>
static const QColor informationBorderColor(Qt::black);
static const QColor informationColor(0xff, 0xff, 0x00, 192); // Note: fourth argument is opacity
@ -11,74 +11,65 @@ static const int informationBorder = 2;
static const double informationBorderRadius = 4.0; // Radius of rounded corners
static const int distanceFromPointer = 10; // Distance to place box from mouse pointer or scatter item
InformationBox::InformationBox() : RoundRectItem(informationBorderRadius, nullptr)
InformationBox::InformationBox(StatsView &v) :
ChartRectItem(v, QPen(informationBorderColor, informationBorder),
QBrush(informationColor), informationBorderRadius)
{
setPen(QPen(informationBorderColor, informationBorder));
setBrush(informationColor);
setZValue(ZValues::informationBox);
}
void InformationBox::setText(const std::vector<QString> &text, QPointF pos)
{
width = height = 0.0;
textItems.clear();
QFontMetrics fm(font);
double fontHeight = fm.height();
std::vector<double> widths;
widths.reserve(text.size());
width = 0.0;
for (const QString &s: text) {
if (!s.isEmpty())
addLine(s);
widths.push_back(static_cast<double>(fm.size(Qt::TextSingleLine, s).width()));
width = std::max(width, widths.back());
}
width += 4.0 * informationBorder;
height += 4.0 * informationBorder;
height = widths.size() * fontHeight + 4.0 * informationBorder;
// Setting the position will also set the proper size
setPos(pos);
ChartRectItem::resize(QSizeF(width, height));
painter->setPen(QPen(darkLabelColor)); // QPainter uses QPen to set text color!
double y = 2.0 * informationBorder;
for (size_t i = 0; i < widths.size(); ++i) {
QRectF rect(2.0 * informationBorder, y, widths[i], fontHeight);
painter->drawText(rect, text[i]);
y += fontHeight;
}
}
void InformationBox::setPos(QPointF pos)
{
QRectF plotArea = scene()->sceneRect();
QSizeF size = sceneSize();
double x = pos.x() + distanceFromPointer;
if (x + width >= plotArea.right()) {
if (pos.x() - width >= plotArea.x())
if (x + width >= size.width()) {
if (pos.x() - width >= 0.0)
x = pos.x() - width;
else
x = pos.x() - width / 2.0;
}
double y = pos.y() + distanceFromPointer;
if (y + height >= plotArea.bottom()) {
if (pos.y() - height >= plotArea.y())
if (y + height >= size.height()) {
if (pos.y() - height >= 0.0)
y = pos.y() - height;
else
y = pos.y() - height / 2.0;
}
setRect(x, y, width, height);
double actY = y + 2.0 * informationBorder;
for (auto &item: textItems) {
item->setPos(QPointF(x + 2.0 * informationBorder, actY));
actY += item->boundingRect().height();
}
}
void InformationBox::addLine(const QString &s)
{
textItems.emplace_back(new QGraphicsSimpleTextItem(s, this));
QGraphicsSimpleTextItem &item = *textItems.back();
item.setBrush(QBrush(darkLabelColor));
item.setPos(QPointF(0.0, height));
item.setFont(font);
item.setZValue(ZValues::informationBox);
QRectF rect = item.boundingRect();
width = std::max(width, rect.width());
height += rect.height();
ChartRectItem::setPos(QPointF(x, y));
}
// Try to stay within three-thirds of the chart height
int InformationBox::recommendedMaxLines() const
{
QFontMetrics fm(font);
int maxHeight = static_cast<int>(scene()->sceneRect().height());
int maxHeight = static_cast<int>(sceneSize().height());
return maxHeight * 2 / fm.height() / 3;
}