Qt drag & drop button; drop not detecting - c++

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

In your mouseReleaseEvent, you pass to QGraphicsItem::mousePressEvent instead of QGraphicsItem::mouseReleaseEvent
Edit: I don't know if this matters, but initialize the QGraphicsItem in your constructor
MySquare::MySquare(int _x,int _y, int _w, int _h) : QGraphicsItem()

Related

Qt QGraphicsView Scrolling causes items to randomly disappear

I am having issues with a weird bug which occurs after you adjust the size of a QGraphicsItem.
Here is a YouTube video showing the issue: https://youtu.be/gp1lQTkPf54
In my application, a slider is used to adjust the horizontal zoom of all the regions on the QGraphicsScene. I have made sure to call prepareGeometryChange(); when I am changing the geometry of a region and call update(); but that has not helped. It seems to affect regions that are being rendered out of view from the user.
Code:
mainwindow.cpp
#include "mainwindow.h"
#include "./ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
QGraphicsScene *scene = new QGraphicsScene(this);
ui->graphicsView->setScene(scene);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_pushButton_clicked()
{
RegionGraphicsItem *rgi = new RegionGraphicsItem(ui->graphicsView->scene());
itemList.append(rgi);
ui->graphicsView->scene()->addItem(rgi);
rgi->setHScaleFactor(ui->horizontalSlider->value());
}
void MainWindow::test() {
QWidget test;
test.show();
}
void MainWindow::on_horizontalSlider_valueChanged(int value)
{
for (int i = 0; i < itemList.size(); i++) {
itemList[i]->setHScaleFactor(value);
}
}
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include "regiongraphicsitem.h"
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = nullptr);
~MainWindow();
QList<RegionGraphicsItem*> itemList;
private slots:
void on_pushButton_clicked();
void on_horizontalSlider_valueChanged(int value);
private:
void test();
Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H
regiongraphicsitem.cpp
#include "regiongraphicsitem.h"
RegionGraphicsItem::RegionGraphicsItem(QGraphicsScene *_scene) : QGraphicsItem()
{
regionColor = QColor::fromRgb(255,255,255);
setFlags(ItemIsMovable);
waveFormColor = regionColor.darker(80);
outlineColor = QColor("#0f0f0f");
selectedColor = selectedColor.lighter(30);
hScaleFactor = 100;
mainBrush = QBrush(regionColor);
mainPen = QPen(outlineColor, 1);
gridLength = 5;
height = 56;
oldPos = pos();
scene = _scene;
this->prepareGeometryChange();
gridLocation = 5;
setY((0 * 60) + 1);
}
QRectF RegionGraphicsItem::boundingRect() const
{
return QRectF(0, 0, float(gridLength * hScaleFactor), float(height));
}
void RegionGraphicsItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
Q_UNUSED(widget);
QRectF rect = boundingRect();
painter->setBrush(mainBrush);
painter->setPen(mainPen);
painter->drawRoundedRect(rect, 5, 5);
painter->setPen(mainPen);
if (selected) {
painter->setBrush(QBrush(mainPen.color()));
painter->drawRoundedRect(QRect(rect.x(), rect.y(), rect.width(), 20), 5, 5);
painter->drawRect(QRect(rect.x(), rect.y() + 5, rect.width(), 15));
}
QFont font = scene->font();
font.setPixelSize(10);
font.setBold(true);
QFontMetricsF fontMetrics(font);
QString text = "TEST";
int heightFont = fontMetrics.boundingRect(text).height();
if (selected) {
painter->setPen(QPen(mainBrush.color(), 1));
}
painter->drawText(5, heightFont + 3, text);
if (pressed == false ) {
setX((gridLocation - 1) * hScaleFactor);
}
}
void RegionGraphicsItem::setHScaleFactor(int value) {
prepareGeometryChange();
hScaleFactor = value;
update();
}
regiongraphicsitem.h
#ifndef RegionGraphicsItem_H
#define RegionGraphicsItem_H
#include <QGraphicsItem>
#include <QColor>
#include <QBrush>
#include <QPen>
#include <QtGui/QPainter>
#include <QGraphicsScene>
#include <QGraphicsSceneMouseEvent>
#include <QDebug>
#include <stdint.h>
class RegionGraphicsItem : public QGraphicsItem
{
public:
RegionGraphicsItem(QGraphicsScene *_scene);
float getGridLocation();
void setHScaleFactor(int value);
protected:
QColor outlineColor;
QColor selectedColor;
QColor regionColor;
QColor waveFormColor;
bool selected;
int penWidth;
int rounded;
QBrush mainBrush;
QBrush waveformBrush;
QPen mainPen;
int height;
float gridLength;
bool pressed = false;
QPointF oldPos, oldMousePos;
int oldTrackIndex;
float gridLocation;
QGraphicsScene *scene;
int oldHScaleFactor;
virtual QRectF boundingRect() const override;
virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override;
private:
int hScaleFactor;
};
#endif // RegionGraphicsItem_H
Steps to reproduce:
Add a RegionGraphicItem to the QGraphicsScene
Increase the slider until the region is off screen
Decrease the slider and the region will not be visible. <-- This is the issue.

Draggable pixmaps inside a QGraphicsScene of graphic items

I have a scene with a 12*4 grid with blocks of QGraphicsItems ,when i right click on the blocks I have a contexmenu that
can add icons inside the blocks my proplem is that
I can't fingure out how can I make those icons draggable to the other blocks inside the graphic scene ,I know there is the "Draggable Icons Example" but how can I implement that code to a graphic scene.
this is the mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QGraphicsPathItem>
class QGraphicsSceneMouseEvent;
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
bool eventFilter(QObject *, QEvent *);
~MainWindow();
private slots:
void showContextMenu(const QPoint&);
void addPixBlock();
private:
Ui::MainWindow *ui;
QGraphicsScene *scene;
QGraphicsItem *itemAt(const QPointF&);
int x;
int y;
QMenu *Menu;
QMenu *Submenu;
QAction *Picture;
QGraphicsPixmapItem* pix;
};
#endif // MAINWINDOW_H
the mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "block.h"
#include <QGraphicsScene>
#include <QGraphicsSceneMouseEvent>
#include <QDebug>
#include <QPainter>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
scene = new QGraphicsScene(this) ;
for(int row=-4;row<8;++row)
for(int column=0;column<4;++column)
{
Block *b = new Block;
scene->addItem(b);
b->setPos(row* 95,column*85);
}
ui->graphicsView->setScene(scene);
scene->installEventFilter(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
QGraphicsItem* MainWindow::itemAt(const QPointF &pos)
{
QList<QGraphicsItem*> items = scene->items(QRectF(pos - QPointF(1,1),
QSize(3,3)));
foreach(QGraphicsItem *item, items)
if (item->type() > QGraphicsItem::UserType)
return item;
return 0;
}
bool MainWindow::eventFilter(QObject *o, QEvent *e)
{
QGraphicsSceneMouseEvent *me = (QGraphicsSceneMouseEvent*) e;
switch ((int) e->type()){
case QEvent::GraphicsSceneMousePress:{
switch ((int) me->button()){
case Qt::RightButton:{
QGraphicsItem *item = itemAt(me->scenePos());
if (item && item->type() == Block::Type){
x=item->scenePos().x();
y=item->scenePos().y();
showContextMenu(item->scenePos().toPoint());
}
break;
}
}
break;
}
}
return QObject::eventFilter(o, e);
}
void MainWindow::showContextMenu(const QPoint &pos)
{
Menu= new QMenu("Menu");
Submenu=Menu->addMenu(QIcon(":/img/pix.png"),"Pix");
Picture =Submenu->addAction(QIcon(":/img/pix.png"),"Pix");
connect(Picture, SIGNAL(triggered()), this, SLOT(addPixBlock()));
Menu->exec(QCursor::pos());
}
void MainWindow::addPixBlock()
{
QPixmap pixmap(":/img/pix.png");
pix = scene->addPixmap(pixmap.scaled(70,50));
pix->setPos(x,y);
}
the block.h
#ifndef BLOCK_H
#define BLOCK_H
#include <QGraphicsPathItem>
class QGraphicsSceneMouseEvent;
class Block : public QGraphicsPathItem
{
public:
enum { Type = QGraphicsItem::UserType + 3 };
int type() const { return Type; }
Block(QGraphicsItem *parent = 0);
void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget
*widget);
bool eventFilter(QObject *, QEvent *);
};
#endif // BLOCK_H
the Block.cpp
#include "block.h"
#include <QPainter>
#include <QtWidgets>
class QGraphicsSceneMouseEvent;
Block::Block(QGraphicsItem *parent)
: QGraphicsPathItem(parent)
{
QPainterPath p;
//<->,|,<->,|,roundness
p.addRoundedRect(0,0,80,50, 5, 5);
setPath(p);
setAcceptDrops(true);
setAcceptedMouseButtons(Qt::LeftButton);
}
void Block::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
QWidget *widget)
{
Q_UNUSED(option)
Q_UNUSED(widget)
painter->setPen(QPen(QColor(67, 141, 220)));
painter->setBrush(QColor(67, 141, 220,100));
painter->drawPath(path());
}
First of all if you want to place a QGraphicsPixmapItem on top of another item, a better option is to set it as your parentItem.
On the other hand we can use an event filter but a better option in this case is to implement a custom QGraphicsScene, and when pressing with the left key it allows to drag the item, for that we use QDrag and we pass the data of the item, then we overwrite the event dropEvent where we will obtain the item and establish a new parent.
graphicsscene.h
#ifndef GRAPHICSSCENE_H
#define GRAPHICSSCENE_H
#include <QGraphicsScene>
class QMenu;
class QAction;
class GraphicsScene : public QGraphicsScene
{
public:
using QGraphicsScene::QGraphicsScene;
protected:
void mousePressEvent(QGraphicsSceneMouseEvent *event) override;
void dropEvent(QGraphicsSceneDragDropEvent *event) override;
private:
QGraphicsPixmapItem *findPixmapItem(QGraphicsItem *item);
void createDrag(const QPointF &pos, QWidget *widget, QGraphicsItem *item);
void showContextMenu(const QPointF &pos);
void addPixBlock(QGraphicsItem *item);
QMenu *menu;
QMenu *submenu;
QAction *picture;
QGraphicsPixmapItem *pix;
};
#endif // GRAPHICSSCENE_H
graphicsscene.cpp
#include "graphicsscene.h"
#include <QDrag>
#include <QGraphicsItem>
#include <QGraphicsSceneMouseEvent>
#include <QMenu>
#include <QMimeData>
#include <QWidget>
void GraphicsScene::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
auto its = items(QRectF(event->scenePos() - QPointF(1,1), QSize(3,3)));
auto val = std::find_if(its.constBegin(), its.constEnd(), [](auto const& it){
return it->type() > QGraphicsItem::UserType;
});
if(val == its.constEnd())
return;
if(event->button() == Qt::RightButton){
showContextMenu(event->scenePos());
}
else{
createDrag(event->scenePos(), event->widget(), *val);
}
}
void GraphicsScene::dropEvent(QGraphicsSceneDragDropEvent *event)
{
QByteArray byteArray = event->mimeData()->data("Item");
QGraphicsPixmapItem * item = *reinterpret_cast<QGraphicsPixmapItem**>(byteArray.data());
QGraphicsItem *item_parent = itemAt(event->scenePos(), QTransform());
item->setParentItem(item_parent);
}
QGraphicsPixmapItem *GraphicsScene::findPixmapItem(QGraphicsItem *item){
auto chs = item->childItems();
auto val = std::find_if(chs.constBegin(), chs.constEnd(), [](auto const& it){
return static_cast<QGraphicsPixmapItem *>(it) != Q_NULLPTR;
});
return val == chs.constEnd() ? Q_NULLPTR : static_cast<QGraphicsPixmapItem *>(*val);
}
void GraphicsScene::createDrag(const QPointF &pos, QWidget *widget, QGraphicsItem *item){
QGraphicsPixmapItem *pix = findPixmapItem(item);
if(pix == Q_NULLPTR)
return;
QByteArray byteArray(reinterpret_cast<char*>(&pix),sizeof(QGraphicsPixmapItem*));
QDrag *drag = new QDrag(widget);
QMimeData * mimeData = new QMimeData;
mimeData->setData("Item",byteArray);
drag->setMimeData(mimeData);
drag->setHotSpot(pos.toPoint()-pix->scenePos().toPoint());
drag->setPixmap(pix->pixmap());
drag->start();
}
void GraphicsScene::showContextMenu(const QPointF &pos)
{
QGraphicsItem *item = itemAt(pos, QTransform());
menu= new QMenu("Menu");
submenu = menu->addMenu(QIcon(":/img/pix.png"),"Pix");
picture = submenu->addAction(QIcon(":/img/pix.png"),"Pix");
connect(picture, &QAction::triggered, [item, this](){
addPixBlock(item);
});
menu->exec(QCursor::pos());
}
void GraphicsScene::addPixBlock(QGraphicsItem *item)
{
if(findPixmapItem(item))
return;
QPixmap pixmap(":/img/pix.png");
pix = addPixmap(pixmap.scaled(70,50));
if(pix->parentItem() != item)
pix->setParentItem(item);
}
Then we establish that new scene and add the Blocks.
The complete example can be found in the following link

Qt QPropertyAnimation for widgets in layout - widgets shaking

I want to make widgets increase in height with QPropertyAnimation, when widgets are arranged with QVboxLayout.
The problem is that when I open more than one widget, they start to move/shake during animation.
I have prepared minimum working example, here tar gz project
The problem appears when you press "open" button for first, second, then third widget, you can see then that they are shaking, moving slightly up and down during "open" animation.
Has someone idea what to do to avoid this ?
I can set setSizeConstraint(QLayout::SetFixedSize) on main layout and they dont shake, but then resizing and other doesn't work.
Best Regards
Marek
Some time ago I've wrote a layout which animates widget position it contains.
You should build your layout in such way that each widget which should be animated should be inside this layout (one AnimLayout per widget which should be animated):
#include <QLayout>
QT_FORWARD_DECLARE_CLASS(QPropertyAnimation)
class AnimLayout : public QLayout
{
Q_OBJECT
Q_PROPERTY(QPoint delta
READ delta
WRITE setDelta
NOTIFY deltaChanged)
Q_PROPERTY(QRect widgetRect
READ widgetRect
WRITE setWidgetRect
NOTIFY widgetRectChanged)
Q_PROPERTY(bool active
READ isDeltaActive
WRITE setDeltaActive
NOTIFY deltaActiveChanged)
public:
explicit AnimLayout(QWidget *parent = 0);
~AnimLayout();
QPoint delta() const;
void setDelta(const QPoint &value);
QSize sizeHint() const;
void setGeometry(const QRect &);
QSize minimumSize() const;
int count() const;
QSize deltaSize() const;
QRect widgetRect() const;
void setWidgetRect(const QRect &value);
bool isDeltaActive() const;
void setDeltaActive(bool active = true);
void updateItemPosition();
private:
void addItem(QLayoutItem *item);
QLayoutItem *itemAt(int index) const;
QLayoutItem *takeAt(int index);
signals:
void deltaChanged(const QPoint &value);
void widgetRectChanged(const QRect &value);
void deltaActiveChanged(bool active);
public slots:
void testIt();
private:
QLayoutItem *item;
QPropertyAnimation *animation;
QPoint mDelta;
bool mDeltaActive;
};
///////////////////////////////////////////////////////////
#include "animlayout.h"
#include <QPropertyAnimation>
AnimLayout::AnimLayout(QWidget *parent) :
QLayout(parent) ,
item(0)
{
animation = new QPropertyAnimation(this);
animation->setPropertyName("widgetRect");
animation->setDuration(400);
animation->setTargetObject(this);
mDeltaActive = false;
}
AnimLayout::~AnimLayout()
{
delete item;
}
QPoint AnimLayout::delta() const
{
return mDelta;
}
void AnimLayout::setDelta(const QPoint &value)
{
if (mDelta != value) {
mDelta = value;
emit deltaChanged(mDelta);
invalidate();
}
}
void AnimLayout::addItem(QLayoutItem *newItem)
{
Q_ASSERT(!item);
animation->stop();
item =newItem;
emit widgetRectChanged(item->geometry());
invalidate();
}
QSize AnimLayout::sizeHint() const
{
if (!item)
return QSize();
QSize result(item->sizeHint());
result += deltaSize();
int m = 2*margin();
result += QSize(m,m);
return result;
}
void AnimLayout::updateItemPosition()
{
QRect dest = contentsRect();
QPoint d = delta();
if (isDeltaActive()) {
d = -d;
}
if (d.x()!=0) {
if (d.x()>0) {
dest.setLeft(dest.left()+d.x());
} else {
dest.setRight(dest.right()+d.x());
}
}
if (d.y()) {
if (d.y()>0) {
dest.setTop(dest.top()+d.y());
} else {
dest.setBottom(dest.bottom()+d.y());
}
}
animation->setEndValue(dest);
if (widgetRect()!=dest) {
animation->start();
}
}
void AnimLayout::setGeometry(const QRect &rect)
{
QLayout::setGeometry(rect);
updateItemPosition();
}
QLayoutItem *AnimLayout::itemAt(int i) const
{
return i==0?item:0;
}
QLayoutItem *AnimLayout::takeAt(int i)
{
Q_ASSERT(i==0);
QLayoutItem *r = item;
item = 0;
return r;
}
void AnimLayout::testIt()
{
setDeltaActive(!isDeltaActive());
}
QRect AnimLayout::widgetRect() const
{
if (item)
return item->geometry();
return QRect();
}
void AnimLayout::setWidgetRect(const QRect &value)
{
if (item && item->geometry()!=value) {
item->setGeometry(value);
emit widgetRectChanged(item->geometry());
}
}
bool AnimLayout::isDeltaActive() const
{
return mDeltaActive;
}
void AnimLayout::setDeltaActive(bool active)
{
if (active!=mDeltaActive) {
mDeltaActive = active;
animation->stop();
updateItemPosition();
emit deltaActiveChanged(active);
}
}
QSize AnimLayout::minimumSize() const
{
QSize result(deltaSize());
if (item) {
result += item->minimumSize();
}
int m = 2*margin();
result += QSize(m,m);
return result;
}
int AnimLayout::count() const
{
return item?1:0;
}
QSize AnimLayout::deltaSize() const
{
return QSize(qAbs(mDelta.x()), qAbs(mDelta.y()));
}
It has some extra functionality you don't need (mDelta).
Sorry it took me so long ;)
I have tested it and it works great.
However, when I was working with my previous code I have made it work without shaking. The change I made was to add QWidget into QScrollArea and then set QVBoxLayout on that widget.
Anyway many thanks for help.
Below there is example in one main.cpp and there is variable "animatedLayout" which turns on or off your AnimLayout.
#include
#include
class AnimLayout : public QLayout
{
Q_OBJECT
Q_PROPERTY(QRect widgetRect
READ widgetRect
WRITE setWidgetRect
NOTIFY widgetRectChanged)
public:
explicit AnimLayout(QWidget *parent = 0);
~AnimLayout();
QSize sizeHint() const;
void setGeometry(const QRect &);
QSize minimumSize() const;
int count() const;
QRect widgetRect() const;
void setWidgetRect(const QRect &value);
void updateItemPosition();
private:
void addItem(QLayoutItem *item);
QLayoutItem *itemAt(int index) const;
QLayoutItem *takeAt(int index);
signals:
void widgetRectChanged(const QRect &value);
public slots:
private:
QLayoutItem *item;
QPropertyAnimation *animation;
};
struct FrameDataStruct {
QFrame *mainFrame;
QFrame *upFrame;
QFrame *downFrame;
QPushButton *button;
QVBoxLayout *upFrameLayout;
QLabel *text;
QVBoxLayout *downFrameLayout;
QVBoxLayout *frameLayout;
QPropertyAnimation *animation;
int frame_id;
int basic_height;
bool expanded;
AnimLayout *animLayout;
};
class Proptest : public QMainWindow
{
Q_OBJECT
public:
explicit Proptest();
~Proptest();
private slots:
void setDataStruct();
void startAnimation(int frame_id);
void animFinished(int frame_id);
private:
QMap frameMap;
QSignalMapper *animStartMapper;
QSignalMapper *animFinishedMapper;
bool initialized;
QWidget *scrollWidget;
QVBoxLayout *main_layout;
QWidget *widget;
QScrollArea *scrollArea;
QVBoxLayout *central_layout;
bool layoutAnimated;
};
Proptest::Proptest()
: widget(new QWidget)
{
setCentralWidget(widget);
this->setGeometry(200,200,300,600);
central_layout=new QVBoxLayout(widget);
scrollArea=new QScrollArea(widget);
central_layout->addWidget(scrollArea);
animStartMapper=new QSignalMapper(this);
connect(animStartMapper,SIGNAL(mapped(int)),this,SLOT(startAnimation(int)));
animFinishedMapper=new QSignalMapper(this);
connect(animFinishedMapper,SIGNAL(mapped(int)),this,SLOT(animFinished(int)));
scrollWidget=new QWidget(widget);
scrollArea->setWidget(scrollWidget);
main_layout=new QVBoxLayout(scrollWidget);
main_layout->setSizeConstraint(QLayout::SetMinAndMaxSize);
scrollArea->setWidgetResizable(true);
scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
layoutAnimated=true;
this->setDataStruct();
}
void Proptest::setDataStruct() {
for(int i=0;iexpanded=false;
r->frame_id=i;
r->mainFrame=new QFrame(scrollWidget);
r->upFrame=new QFrame(r->mainFrame);
r->upFrame->setMinimumHeight(40);
r->button=new QPushButton(QString("open"),r->upFrame);
r->upFrameLayout=new QVBoxLayout(r->upFrame);
r->upFrameLayout->addWidget(r->button);
r->downFrame=new QFrame(r->mainFrame);
r->text=new QLabel(QString("some text SOME TEXT some text"),r->downFrame);
r->downFrameLayout=new QVBoxLayout(r->downFrame);
r->downFrameLayout->addWidget(r->text);
r->frameLayout=new QVBoxLayout(r->mainFrame);
r->frameLayout->addWidget(r->upFrame);
r->frameLayout->addItem(new QSpacerItem(10,10));
r->frameLayout->addWidget(r->downFrame);
r->frameLayout->setStretch(0,0);
r->frameLayout->setStretch(1,1);
r->frameLayout->setStretch(2,0);
r->downFrame->setVisible(false);
r->animation=new QPropertyAnimation(r->mainFrame,"minimumHeight");
r->animation->setDuration(500);
connect(r->button,SIGNAL(clicked(bool)),animStartMapper,SLOT(map()));
animStartMapper->setMapping(r->button,r->frame_id);
connect(r->animation,SIGNAL(finished()),animFinishedMapper,SLOT(map()));
animFinishedMapper->setMapping(r->animation,r->frame_id);
if(layoutAnimated) {
r->animLayout=new AnimLayout();
r->animLayout->addWidget(r->mainFrame);
main_layout->addItem(r->animLayout);
}
else {
main_layout->addWidget(r->mainFrame);
}
frameMap.insert(r->frame_id,r);
}
main_layout->addItem(new QSpacerItem(10,10,QSizePolicy::Minimum,QSizePolicy::Expanding));
main_layout->setStretch(main_layout->count()-1,1);
}
void Proptest::startAnimation(int frame_id) {
FrameDataStruct *r=frameMap[frame_id];
if(r->expanded) {
r->expanded=false;
if(layoutAnimated) {
r->downFrame->hide();
}
else {
r->downFrame->setVisible(false);
r->animation->setStartValue(r->mainFrame->geometry().height());
r->animation->setEndValue(r->basic_height);
}
} else {
r->expanded=true;
if(layoutAnimated) {
r->downFrame->show();
}
else {
r->basic_height=r->mainFrame->geometry().height();
r->animation->setStartValue(r->basic_height);
r->animation->setEndValue(r->basic_height*2);
r->upFrame->setMinimumHeight(r->upFrame->height());
}
}
if(!layoutAnimated)
r->animation->start();
}
void Proptest::animFinished(int frame_id) {
FrameDataStruct *r=frameMap[frame_id];
if(r->expanded)
r->downFrame->setVisible(true);
}
Proptest::~Proptest() {
}
AnimLayout::AnimLayout(QWidget *parent) :
QLayout(parent) ,
item(0)
{
animation = new QPropertyAnimation(this);
animation->setPropertyName("widgetRect");
animation->setDuration(400);
animation->setTargetObject(this);
}
AnimLayout::~AnimLayout()
{
delete item;
}
void AnimLayout::addItem(QLayoutItem *newItem)
{
Q_ASSERT(!item);
animation->stop();
item =newItem;
emit widgetRectChanged(item->geometry());
invalidate();
}
QSize AnimLayout::sizeHint() const
{
if (!item)
return QSize();
QSize result(item->sizeHint());
int m = 2*margin();
result += QSize(m,m);
return result;
}
void AnimLayout::updateItemPosition()
{
QRect dest = contentsRect();
animation->setEndValue(dest);
if (widgetRect()!=dest) {
animation->start();
}
}
void AnimLayout::setGeometry(const QRect &rect)
{
QLayout::setGeometry(rect);
updateItemPosition();
}
QLayoutItem *AnimLayout::itemAt(int i) const
{
return i==0?item:0;
}
QLayoutItem *AnimLayout::takeAt(int i)
{
Q_ASSERT(i==0);
QLayoutItem *r = item;
item = 0;
return r;
}
QRect AnimLayout::widgetRect() const
{
if (item)
return item->geometry();
return QRect();
}
void AnimLayout::setWidgetRect(const QRect &value)
{
if (item && item->geometry()!=value) {
item->setGeometry(value);
emit widgetRectChanged(item->geometry());
}
}
QSize AnimLayout::minimumSize() const
{
QSize result(item->minimumSize());
int m = 2*margin();
result += QSize(m,m);
return result;
}
int AnimLayout::count() const
{
return item?1:0;
}
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Proptest w;
w.show();
return a.exec();
}
#include "main.moc"
Best Regards
Marek
My answer again, dont know why but previosu was deleted.
I have used Your AnimLayout and it works great.
Below there is example in main.cpp with "layoutAnimated" variable to switch on and off AnimLayout.
#include <QApplication>
#include <QtWidgets>
class AnimLayout : public QLayout
{
Q_OBJECT
Q_PROPERTY(QRect widgetRect
READ widgetRect
WRITE setWidgetRect
NOTIFY widgetRectChanged)
public:
explicit AnimLayout(QWidget *parent = 0);
~AnimLayout();
QSize sizeHint() const;
void setGeometry(const QRect &);
QSize minimumSize() const;
int count() const;
QRect widgetRect() const;
void setWidgetRect(const QRect &value);
void updateItemPosition();
private:
void addItem(QLayoutItem *item);
QLayoutItem *itemAt(int index) const;
QLayoutItem *takeAt(int index);
signals:
void widgetRectChanged(const QRect &value);
public slots:
private:
QLayoutItem *item;
QPropertyAnimation *animation;
};
struct FrameDataStruct {
QFrame *mainFrame;
QFrame *upFrame;
QFrame *downFrame;
QPushButton *button;
QVBoxLayout *upFrameLayout;
QLabel *text;
QVBoxLayout *downFrameLayout;
QVBoxLayout *frameLayout;
QPropertyAnimation *animation;
int frame_id;
int basic_height;
bool expanded;
AnimLayout *animLayout;
};
class Proptest : public QMainWindow
{
Q_OBJECT
public:
explicit Proptest();
~Proptest();
private slots:
void setDataStruct();
void startAnimation(int frame_id);
void animFinished(int frame_id);
private:
QMap<int,FrameDataStruct*> frameMap;
QSignalMapper *animStartMapper;
QSignalMapper *animFinishedMapper;
bool initialized;
QWidget *scrollWidget;
QVBoxLayout *main_layout;
QWidget *widget;
QScrollArea *scrollArea;
QVBoxLayout *central_layout;
bool layoutAnimated;
};
Proptest::Proptest()
: widget(new QWidget)
{
setCentralWidget(widget);
this->setGeometry(200,200,300,600);
central_layout=new QVBoxLayout(widget);
scrollArea=new QScrollArea(widget);
central_layout->addWidget(scrollArea);
animStartMapper=new QSignalMapper(this);
connect(animStartMapper,SIGNAL(mapped(int)),this,SLOT(startAnimation(int)));
animFinishedMapper=new QSignalMapper(this);
connect(animFinishedMapper,SIGNAL(mapped(int)),this,SLOT(animFinished(int)));
scrollWidget=new QWidget(widget);
scrollArea->setWidget(scrollWidget);
main_layout=new QVBoxLayout(scrollWidget);
main_layout->setSizeConstraint(QLayout::SetMinAndMaxSize);
scrollArea->setWidgetResizable(true);
scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
layoutAnimated=true;
this->setDataStruct();
}
void Proptest::setDataStruct() {
for(int i=0;i<5;i++) {
FrameDataStruct *r=new FrameDataStruct;
r->expanded=false;
r->frame_id=i;
r->mainFrame=new QFrame(scrollWidget);
r->upFrame=new QFrame(r->mainFrame);
r->upFrame->setMinimumHeight(40);
r->button=new QPushButton(QString("open"),r->upFrame);
r->upFrameLayout=new QVBoxLayout(r->upFrame);
r->upFrameLayout->addWidget(r->button);
r->downFrame=new QFrame(r->mainFrame);
r->text=new QLabel(QString("some text SOME TEXT some text"),r->downFrame);
r->downFrameLayout=new QVBoxLayout(r->downFrame);
r->downFrameLayout->addWidget(r->text);
r->frameLayout=new QVBoxLayout(r->mainFrame);
r->frameLayout->addWidget(r->upFrame);
r->frameLayout->addItem(new QSpacerItem(10,10));
r->frameLayout->addWidget(r->downFrame);
r->frameLayout->setStretch(0,0);
r->frameLayout->setStretch(1,1);
r->frameLayout->setStretch(2,0);
r->downFrame->setVisible(false);
r->animation=new QPropertyAnimation(r->mainFrame,"minimumHeight");
r->animation->setDuration(500);
connect(r->button,SIGNAL(clicked(bool)),animStartMapper,SLOT(map()));
animStartMapper->setMapping(r->button,r->frame_id);
connect(r->animation,SIGNAL(finished()),animFinishedMapper,SLOT(map()));
animFinishedMapper->setMapping(r->animation,r->frame_id);
if(layoutAnimated) {
r->animLayout=new AnimLayout();
r->animLayout->addWidget(r->mainFrame);
main_layout->addItem(r->animLayout);
}
else {
main_layout->addWidget(r->mainFrame);
}
frameMap.insert(r->frame_id,r);
}
main_layout->addItem(new QSpacerItem(10,10,QSizePolicy::Minimum,QSizePolicy::Expanding));
main_layout->setStretch(main_layout->count()-1,1);
}
void Proptest::startAnimation(int frame_id) {
FrameDataStruct *r=frameMap[frame_id];
if(r->expanded) {
r->expanded=false;
if(layoutAnimated) {
r->downFrame->hide();
}
else {
r->downFrame->setVisible(false);
r->animation->setStartValue(r->mainFrame->geometry().height());
r->animation->setEndValue(r->basic_height);
}
} else {
r->expanded=true;
if(layoutAnimated) {
r->downFrame->show();
}
else {
r->basic_height=r->mainFrame->geometry().height();
r->animation->setStartValue(r->basic_height);
r->animation->setEndValue(r->basic_height*2);
r->upFrame->setMinimumHeight(r->upFrame->height());
}
}
if(!layoutAnimated)
r->animation->start();
}
void Proptest::animFinished(int frame_id) {
FrameDataStruct *r=frameMap[frame_id];
if(r->expanded)
r->downFrame->setVisible(true);
}
Proptest::~Proptest() {
}
AnimLayout::AnimLayout(QWidget *parent) :
QLayout(parent) ,
item(0)
{
animation = new QPropertyAnimation(this);
animation->setPropertyName("widgetRect");
animation->setDuration(400);
animation->setTargetObject(this);
}
AnimLayout::~AnimLayout()
{
delete item;
}
void AnimLayout::addItem(QLayoutItem *newItem)
{
Q_ASSERT(!item);
animation->stop();
item =newItem;
emit widgetRectChanged(item->geometry());
invalidate();
}
QSize AnimLayout::sizeHint() const
{
if (!item)
return QSize();
QSize result(item->sizeHint());
int m = 2*margin();
result += QSize(m,m);
return result;
}
void AnimLayout::updateItemPosition()
{
QRect dest = contentsRect();
animation->setEndValue(dest);
if (widgetRect()!=dest) {
animation->start();
}
}
void AnimLayout::setGeometry(const QRect &rect)
{
QLayout::setGeometry(rect);
updateItemPosition();
}
QLayoutItem *AnimLayout::itemAt(int i) const
{
return i==0?item:0;
}
QLayoutItem *AnimLayout::takeAt(int i)
{
Q_ASSERT(i==0);
QLayoutItem *r = item;
item = 0;
return r;
}
QRect AnimLayout::widgetRect() const
{
if (item)
return item->geometry();
return QRect();
}
void AnimLayout::setWidgetRect(const QRect &value)
{
if (item && item->geometry()!=value) {
item->setGeometry(value);
emit widgetRectChanged(item->geometry());
}
}
QSize AnimLayout::minimumSize() const
{
QSize result(item->minimumSize());
int m = 2*margin();
result += QSize(m,m);
return result;
}
int AnimLayout::count() const
{
return item?1:0;
}
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Proptest w;
w.show();
return a.exec();
}
#include "main.moc"
Best Regards
Marek

Adding Text in GraphicsView in Qt

I am implementing a code to add different entities on a button click.I am getting a problem to add Text in graphics view. Following is the code snippet that I am implementing. What needs to be done?
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QPaintEvent>
#include <QGraphicsScene>
#include <QGraphicsView>
#include <QPainter>
#include "line.h"
#include "circle.h"
#include "ellipse.h"
#include "point.h"
#include "arc.h"
#include "text.h"
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
protected:
void wheelEvent(QWheelEvent* event);
private:
Ui::MainWindow *ui;
bool mFirstClick;
bool mPaintFlag;
int mStartX;
int mStartY;
int mEndX;
int mEndY;
QGraphicsScene *scene;
QPainter *painter;
point *item;
line *item1;
circle *item2;
ellipse *item3;
arc *item4;
private slots:
void drawPoint();
void drawLine();
void drawCircle();
void drawEllipse();
void drawArc();
void drawText();
void on_actionSave_triggered();
void on_actionOpen_triggered();
void on_actionQuit_2_triggered();
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QMouseEvent>
#include<QFileDialog>
#include<QMessageBox>
#include<QTextEdit>
#include<QString>
#include <QDebug>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent), ui(new Ui::MainWindow)
{
ui->setupUi(this);
setWindowTitle(tr("GD CAD"));
scene = new QGraphicsScene;
for(int x = 0; x <= ui->graphicsView->width(); x += 10){
scene->addLine(x,0,x,ui->graphicsView->height(),QPen(Qt::green));
}
for(int y = 0; y <= ui->graphicsView->height(); y += 10){
scene->addLine(0,y,ui->graphicsView->width(),y,QPen(Qt::green));
}
for(int x = 10; x <= ui->graphicsView->width(); x += 100){
scene->addLine(x,0,x,ui->graphicsView->height(),QPen(Qt::darkGreen));
}
for(int y = 10; y <= ui->graphicsView->height(); y += 100){
scene->addLine(0,y,ui->graphicsView->width(),y,QPen(Qt::darkGreen));
}
ui->graphicsView->setScene(scene);
connect(ui->pointButton, SIGNAL(clicked()), this, SLOT(drawPoint()));
connect(ui->lineButton, SIGNAL(clicked()), this, SLOT(drawLine()));
connect(ui->circleButton, SIGNAL(clicked()), this, SLOT(drawCircle()));
connect(ui->ellipseButton, SIGNAL(clicked()), this, SLOT(drawEllipse()));
connect(ui->arcButton, SIGNAL(clicked()),this, SLOT(drawArc()));
connect(ui->text,SIGNAL(clicked()),this,SLOT(drawText()));
connect(ui->actionPoints, SIGNAL(triggered()), this, SLOT(drawPoint()));
connect(ui->actionLine, SIGNAL(triggered()), this, SLOT(drawLine()));
connect(ui->actionCircle, SIGNAL(triggered()), this, SLOT(drawCircle()));
connect(ui->actionEllipse, SIGNAL(triggered()), this, SLOT(drawEllipse()));
}
void MainWindow::drawPoint(){
ui->graphicsView->setScene(scene);
item = new point;
scene->addItem(item);
qDebug() << "Point Created";
connect(item, SIGNAL(DrawFinished()), this, SLOT(drawPoint()));
}
void MainWindow::drawLine(){
ui->graphicsView->setScene(scene);
item1 = new line;
scene->addItem(item1);
qDebug() << "Line Created";
connect(item1, SIGNAL(DrawFinished()), this, SLOT(drawLine()));
}
void MainWindow::drawCircle(){
ui->graphicsView->setScene(scene);
item2 = new circle;
scene->addItem(item2);
qDebug() << "Circle Created";
connect(item2, SIGNAL(DrawFinished()), this, SLOT(drawCircle()));
}
void MainWindow::drawArc(){
ui->graphicsView->setScene(scene);
item4 = new arc;
scene->addItem(item4);
qDebug() << "Circle Created";
connect(item4, SIGNAL(DrawFinished()), this, SLOT(drawArc()));
}
void MainWindow::drawEllipse(){
ui->graphicsView->setScene(scene);
item3 = new ellipse;
scene->addItem(item3);
qDebug() << "Ellipse Created";
connect(item3, SIGNAL(DrawFinished()), this, SLOT(drawEllipse()));
}
void MainWindow::wheelEvent(QWheelEvent* event) {
ui->graphicsView->setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
// Scale the view / do the zoom
double scaleFactor = 1.15;
if(event->delta() > 0) {
// Zoom in
ui->graphicsView->scale(scaleFactor, scaleFactor);
} else {
// Zooming out
ui->graphicsView->scale(1.0 / scaleFactor, 1.0 / scaleFactor);
}
}
void MainWindow::on_actionOpen_triggered()
{
QString filename=QFileDialog::getOpenFileName(
this,
tr("Open File"),
QString(),
tr("file Name(*.dwg|*.DWG|*.dxf)")
);
if (!filename.isEmpty()) {
QFile file(filename);
if (!file.open(QIODevice::ReadOnly)) {
QMessageBox::critical(this,
tr("Error"), tr("Could not open file"));
return;
}
}
}
void MainWindow::on_actionSave_triggered()
{
QString filename=QFileDialog::getSaveFileName(
this,
tr("Save File"),
QString(),
tr("file Name(*.txt)")
);
if(!filename.isEmpty()) {
QFile file(filename);
if (!file.open(QIODevice::WriteOnly)) {
QMessageBox::critical(this, tr("Error"), tr("Could not open file"));
return;
} else {
QTextStream stream(&file);
QTextEdit *textEdit;
stream << textEdit->toPlainText();
stream.flush();
file.close();
}
}
}
void MainWindow::on_actionQuit_2_triggered(){
MainWindow *window;
window->close();
}
void MainWindow::drawText(){
ui->graphicsView->setScene(scene);
text *item5 = new text;
scene->addItem(item5);
qDebug() << "text created";
connect(item5, SIGNAL(DrawFinished()), this, SLOT(drawText()));
}
MainWindow::~MainWindow()
{
delete ui;
}
text.h
#ifndef TEXT_H
#define TEXT_H
#include <QGraphicsTextItem>
#include <QPen>
#include<QFocusEvent>
#include<QGraphicsItem>
#include<QGraphicsScene>
#include<QGraphicsSceneMouseEvent>
#include<QGraphicsTextItem>
#include<QFont>
#include"mainwindow.h"
#include"ui_mainwindow.h"
class text:public QGraphicsTextItem
{
Q_OBJECT
public:
enum { Type = UserType + 3 };
enum Mode { InsertText };
void setFont(const QFont &font);
text(QGraphicsItem *parent = 0);
int type() const { return Type; }
public slots:
void setMode(Mode mode);
signals:
void lostFocus(text *item);
void selectedChange(QGraphicsItem *item);
void textInserted(QGraphicsTextItem *item);
void itemSelected(QGraphicsItem *item);
protected:
QVariant itemChange(GraphicsItemChange change, const QVariant &value);
void focusOutEvent(QFocusEvent *event);
void mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event);
void mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent);
private:
Mode myMode;
QFont myFont;};
#endif // TEXT_H
text.cpp
#include "text.h"
#include"mainwindow.h"
#include"ui_mainwindow.h"
text::text(QGraphicsItem *parent):QGraphicsTextItem(parent)
{
setFlag(QGraphicsItem::ItemIsMovable);
setFlag(QGraphicsItem::ItemIsSelectable);
}
QVariant text::itemChange(GraphicsItemChange change,
const QVariant &value)
{
if (change == QGraphicsItem::ItemSelectedHasChanged)
emit selectedChange(this);
return value;
}
void text::focusOutEvent(QFocusEvent *event)
{
setTextInteractionFlags(Qt::NoTextInteraction);
emit lostFocus(this);
QGraphicsTextItem::focusOutEvent(event);
}
void text::setMode(Mode mode)
{
myMode = mode;
}
void text::mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event)
{
if (textInteractionFlags() == Qt::NoTextInteraction)
setTextInteractionFlags(Qt::TextEditorInteraction);
QGraphicsTextItem::mouseDoubleClickEvent(event);
}
void text::mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent)
{
if (mouseEvent->button() != Qt::LeftButton)
return;
switch(myMode){
case InsertText:
text *textItem;
textItem = new text();
// textItem->setFont(myFont);
textItem->setPlainText("hello");
textItem->setTextInteractionFlags(Qt::TextEditorInteraction);
textItem->setZValue(1000.0);
connect(textItem, SIGNAL(lostFocus(DiagramTextItem*)),
this, SLOT(editorLostFocus(DiagramTextItem*)));
connect(textItem, SIGNAL(selectedChange(QGraphicsItem*)),
this, SIGNAL(itemSelected(QGraphicsItem*)));
//addItem(textItem);
// textItem->setDefaultTextColor(myTextColor);
textItem->setPos(mouseEvent->scenePos());
emit textInserted(textItem);
//! [8] //! [9]
default:
;
}
// QGraphicsScene::mousePressEvent(mouseEvent);
}
Hm, if i am not mistaken, it does look like you are setting all kinds of properties of the text item, like Interaction-flags, z-value, color and so on -- everything but not the actual text. The text would be empty and therefore your QGraphicsTextItem will be invisible.
Use setPlainText(), setHtml() or setDocument() on your text item.
There are two places where text-items are created; one is in the mainwindow.cpp:
void MainWindow::drawText(){
ui->graphicsView->setScene(scene);
text *item5 = new text;
scene->addItem(item5);
qDebug() << "text created";
connect(item5, SIGNAL(DrawFinished()), this, SLOT(drawText()));
}
The text is created and added to the scene (with addItem()), but it does not have an actual content; set its content:
item5->setPlainText ("Mickey");
The second text-item is created from inside the text (which is a subclass of a QGraphicsTextItem) class itself:
void text::mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent)
{
...
switch(myMode){
case InsertText:
text *textItem;
textItem = new text();
// textItem->setFont(myFont);
textItem->setPlainText("hello");
It is created correctly, and given a text, but not added to the scene. Add it to the scene, for instance by making it a child of the current text item:
textItem->setParentItem (this);

Qt Display tooltip after mouse hover on QGraphicsPixmapItem

I'm using QGraphicView to show game map that consist QGraphicsPixmapItems. I need to show tooltip on mouse hover at QGraphicsPixmapItem.
For saving QGraphicsPixmapItem position I using MazeItem:
#ifndef MAZEITEM_H
#define MAZEITEM_H
#include <QPoint>
#include <QGraphicsItem>
class MazeItem
{
private:
QPoint myPosition;
QString myToolTip;
public:
MazeItem();
QPoint position() const;
QString toolTip() const;
void setToolTip(const QString &toolTip);
void setPosition(const QPoint &position);
QPoint getPosition();
QGraphicsPixmapItem * pixmap;
};
#endif // MAZEITEM_H
I have widget class to display game map:
#include <QWidget>
#include <QtGui>
#include <QGraphicsView>
#include <QToolTip>
#include "mazeitem.h"
class MazeGUI : public QWidget
{
Q_OBJECT
private:
QGraphicsView * graphicsView;
QGraphicsScene * graphicsScene;
QString sceneString;
int imageSize;
QList<MazeItem> mazeItems;
void addItem(int x, int y, QPixmap picture);
bool event(QEvent *event);
int itemAt(const QPoint &pos);
public:
explicit MazeGUI(QWidget *parent = 0);
void setScene(QString sceneString);
signals:
public slots:
void redraw();
};
#endif // MAZEGUI_H
In constructor I set mouse tracking.
MazeGUI::MazeGUI(QWidget *parent) :
QWidget(parent)
{
setMouseTracking(true);
...
}
This is how I add new maze item.
void MazeGUI::addItem(int x, int y, QPixmap picture)
{
MazeItem mazeItem;
mazeItem.setPosition(QPoint(x, y));
mazeItem.setToolTip("text");
mazeItem.pixmap = this->graphicsScene->addPixmap(picture);
mazeItem.pixmap->setPos(y, x);
mazeItems.append(mazeItem);
}
And this I have from Qt tutorials,
bool MazeGUI::event(QEvent *event)
{
if (event->type() == QEvent::ToolTip) {
// HERE - it never goes here!!
QHelpEvent *helpEvent = static_cast<QHelpEvent *>(event);
int index = itemAt(helpEvent->pos());
if (index != -1) {
QToolTip::showText(helpEvent->globalPos(), mazeItems[index].toolTip());
} else {
QToolTip::hideText();
event->ignore();
}
return true;
}
return QWidget::event(event);
}
int MazeGUI::itemAt(const QPoint &pos)
{
for (int i=0; i < mazeItems.size(); ++i)
{
if (mazeItems[i].getPosition() == pos)
return i;
}
return -1;
}
Was adding the tooltip on wrong object:
Instead of:
mazeItem.setToolTip("text");
It should be:
mazeItem.pixmap->setToolTip("text");