134 lines
4.8 KiB
C++
134 lines
4.8 KiB
C++
#include "tagitem.h"
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#include "tagscene.h"
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#include <QPainter>
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#include <QGuiApplication>
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#include <QGraphicsScene>
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#include <QGraphicsSceneMouseEvent>
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TagItem::TagItem(const Tag &tag)
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: valid(true)
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, m_margins(2, 2, 2, 2)
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{
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setFlags(QGraphicsItem::ItemIsSelectable
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| QGraphicsItem::ItemIsFocusable
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| QGraphicsItem::ItemIgnoresTransformations
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| QGraphicsItem::ItemSendsGeometryChanges);
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QFont font(QGuiApplication::font());
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font.setPointSize(12);
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setFont(font);
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tagUpdated(tag);
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}
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void TagItem::tagUpdated(const Tag &tag)
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{
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m_tag = tag;
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qDebug() << "TagItem updated" << tag.name << tag.anchor;
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setText(tag.name);
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setPos(tag.anchor);
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}
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QRectF TagItem::boundingRect() const
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{
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QRectF parentRect(QGraphicsSimpleTextItem::boundingRect());
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parentRect.translate(-(parentRect.bottomRight() - parentRect.topLeft()) * 0.5);
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return parentRect.marginsAdded(m_margins);
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}
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/* For some reason this is not exposed through the public API so we have to copy-paste it here m( */
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static void paintSelectionHighlightBorder(QPainter *painter, const QStyleOptionGraphicsItem *option, TagItem *item)
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{
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const QRectF mbrect = painter->transform().mapRect(item->boundingRect());
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if (qMin(mbrect.width(), mbrect.height()) < qreal(1.0))
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return;
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const qreal pad = item->pen().widthF() / 2;
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const qreal penWidth = 0; // cosmetic pen
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const QColor fgcolor = option->palette.windowText().color();
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const QColor bgcolor( // ensure good contrast against fgcolor
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fgcolor.red() > 127 ? 0 : 255,
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fgcolor.green() > 127 ? 0 : 255,
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fgcolor.blue() > 127 ? 0 : 255);
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painter->setPen(QPen(bgcolor, penWidth, Qt::SolidLine));
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painter->setBrush(Qt::NoBrush);
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painter->drawRect(item->boundingRect().adjusted(pad, pad, -pad, -pad));
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painter->setPen(QPen(option->palette.windowText(), 0, Qt::DashLine));
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painter->setBrush(Qt::NoBrush);
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painter->drawRect(item->boundingRect().adjusted(pad, pad, -pad, -pad));
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}
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void TagItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
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{
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bool selectionHighlight = option->state & (QStyle::State_Selected | QStyle::State_HasFocus);
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if (selectionHighlight)
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painter->setBrush(QColor("#80aaaaff"));
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else
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painter->setBrush(QColor("#80ffffff"));
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painter->drawRect(boundingRect());
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QRectF parentRect(QGraphicsSimpleTextItem::boundingRect());
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QPointF pos = (parentRect.bottomRight() - parentRect.topLeft()) * 0.5;
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painter->translate(-pos);
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QStyleOptionGraphicsItem newOption(*option);
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newOption.state = ~(QStyle::State_Selected |QStyle::State_HasFocus);
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QGraphicsSimpleTextItem::paint(painter, &newOption, widget);
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painter->translate(pos);
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if (selectionHighlight)
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paintSelectionHighlightBorder(painter, option, this);
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}
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QPainterPath TagItem::shape() const
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{
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QPainterPath path;
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return QGraphicsItem::shape();
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}
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QVariant TagItem::itemChange(QGraphicsItem::GraphicsItemChange change, const QVariant &value)
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{
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//qDebug() << "itemChange" << m_tag.name << this->boundingRect() << change;
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if (change == ItemSceneChange) {
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assert(qvariant_cast<TagScene *>(value)); /* TagItems must only be used in TagScene. */
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} else if (change == ItemPositionChange) {
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/* https://gist.github.com/csukuangfj/c2a06416062bec9ed99eddd705c21275#file-qgraphicsscenetest-cpp-L90
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*
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*/
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/* FIXME */
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} else if (change == ItemSelectedChange) {
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if (!value.toBool())
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setFlag(QGraphicsItem::ItemIsMovable, false);
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}
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return QGraphicsItem::itemChange(change, value);
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}
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void TagItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
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{
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if (event->buttons() & Qt::LeftButton) {
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QPoint delta = event->screenPos() - event->buttonDownScreenPos(Qt::LeftButton);
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int pixelThreshold = 10;
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if (QPoint::dotProduct(delta, delta) > pixelThreshold*pixelThreshold)
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dragAboveThreshold = true;
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if (!dragAboveThreshold) {
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// patch up event to prevent small movements
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event->setPos(event->buttonDownPos(Qt::LeftButton));
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event->setScenePos(event->buttonDownScenePos(Qt::LeftButton));
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event->setScreenPos(event->buttonDownScreenPos(Qt::LeftButton));
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}
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}
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QGraphicsItem::mouseMoveEvent(event);
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}
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void TagItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
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{
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Q_UNUSED(event);
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dragAboveThreshold = false;
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if (isSelected())
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setFlag(QGraphicsItem::ItemIsMovable, true);
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else
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setFlag(QGraphicsItem::ItemIsMovable, false);
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QGraphicsItem::mouseReleaseEvent(event);
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}
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