Qt drag & drop button; drop not detecting
- by Thomas Verbeke
I'm creating a 2D game in QT and i'm trying to implement a drag & drop into my program.
For some reason the drop is not registered: qDebug should print a message on dropping but this doesn't happen.
#include "dialog.h"
#include "ui_dialog.h"
#include "world.h"
#include <vector>
Dialog::Dialog(QWidget *parent) : QDialog(parent), ui(new Ui::Dialog)
{
ui->setupUi(this);
scene = new QGraphicsScene(this);
ui->graphicsView->setScene(scene);
MySquare *item;
QGraphicsRectItem *enemyItem;
World *myWorld = new World();
std::vector<Tile*> tiles = myWorld->createWorld(":/texture.jpg");
int count = 0;
foreach (Tile *tile, tiles){
count++;
item = new MySquare(tile->getXPos()*4,tile->getYPos()*4,4,4);
item->setBrush(QColor(tile->getValue()*255,tile->getValue()*255,tile->getValue()*255));
item->setAcceptDrops(true);
scene->addItem(item);
}
player = new MySquare(10,20,10,10);
player->setAcceptDrops(true);
scene->addItem(player);
//drag & drop part
QPushButton *pushButton = new QPushButton("Click Me",this);
connect(pushButton,SIGNAL(pressed()),this,SLOT(makeDrag()));
setAcceptDrops(true);
}
void Dialog::makeDrag()
{
QDrag *dr = new QDrag(this);
// The data to be transferred by the drag and drop operation is contained in a QMimeData object
QMimeData *data = new QMimeData;
data->setText("This is a test");
// Assign ownership of the QMimeData object to the QDrag object.
dr->setMimeData(data);
// Start the drag and drop operation
dr->start();
}
mysquare.cpp
#include "mysquare.h"
MySquare::MySquare(int _x,int _y, int _w, int _h)
{
isPlayer=false;
Pressed=false;
setFlag(ItemIsMovable);
setFlag(ItemIsFocusable);
setAcceptDrops(true);
color=Qt::red;
color_pressed = Qt::green;
x = _x;
y = _y;
w = _w;
h = _h;
}
QRectF MySquare::boundingRect() const
{
return QRectF(x,y,w,h);
}
void MySquare::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
QRectF rec = boundingRect();
QBrush brush(color);
if (Pressed){
brush.setColor(color);
} else {
brush.setColor(color_pressed);
}
painter->fillRect(rec,brush);
painter->drawRect(rec);
}
void MySquare::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
Pressed=true;
update();
QGraphicsItem::mousePressEvent(event);
qDebug() << "mouse Pressed";
}
void MySquare::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
{
Pressed=false;
update();
QGraphicsItem::mousePressEvent(event);
qDebug() << "mouse Released";
}
void MySquare::keyPressEvent(QKeyEvent *event){
int x = pos().x();
int y = pos().y();
//key handling
QGraphicsItem::keyPressEvent(event);
}
void MySquare::dropEvent(QDropEvent *event)
{
qDebug("dropEvent - square");
// Unpack dropped data and handle it the way you want
qDebug("Contents: %s", event->mimeData()->text().toLatin1().data());
}
void MySquare::dragMoveEvent(QDragMoveEvent *event){
qDebug("dragMoveEvent - square ");
event->accept();
}
void MySquare::dragEnterEvent(QDragEnterEvent *event){
event->setAccepted(true);
qDebug("dragEnterEvent - square");
event->acceptProposedAction();
}
void MySquare::setBrush(QColor _color){
color = _color;
color_pressed = _color;
update(); //repaint
}
edit; there is no problem with qDebug() i'm just using it to test them i'm inside the drag events..which i'm not
