I have a QDialog for beginning of my game.in this class I have a QGraphicsTextItem. I want to it is clickable. When user clicked play game start. I do this but not work.
class Mydialog_start:public QDialog
{
Q_OBJECT
public:
explicit Mydialog_start(QWidget *parent = 0);
signals:
public slots:
void on_play_clicked();
void on_exit_clicked();
private:
QGraphicsScene* scene;
QGraphicsView* view;
QPixmap image;
QBrush brush;
QGraphicsTextItem* text;
QFont font;
const int x_size;
const int y_size;
};
Mydialog_start::Mydialog_start(QWidget *parent) :
QDialog(parent),x_size(400),y_size(400)
{
scene=new QGraphicsScene(this);
view=new QGraphicsView(this);
view->setScene(scene);
scene->setSceneRect(0,0,x_size,y_size);
image.load(":picture/image/background.jpg");
image=image.scaled(x_size,y_size);
brush.setTexture(image);
scene->setBackgroundBrush(brush);
font.setBold(true);
font.setPointSize(40);
font.setItalic(true);
text=scene->addText("play",font);
text->setDefaultTextColor(QColor("red"));
text->setPos(100,300);
this->setFixedSize(400,400);
connect(text,SIGNAL(linkActivated(QString("play"))),this,SLOT(on_play_clicked()));
}
void Mydialog_start::on_play_clicked()
{
accept();
}
void Mydialog_start::on_exit_clicked()
{
reject();
}
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
Mydialog_start dialog;
dialog.exec();
if( dialog.exec()==QDialog::Accepted)
{
w.show();
}
else
{
w.close();
}
}
Not quite sure whether you needed your text item to be "editable" - see Mitch's comment...
It seems that you need your item to be "clickable" - then all you need are some flags:
text->setFlags(QGraphicsItem::ItemIsSelectable | QGraphicsItem::ItemIsFocusable);
Related
I'm trying to create a program in which you can connect points together with lines. I instantiate QGraphicsEllipseItem into a QGraphicsScene and I use HoverEnterEvent and HoverLeaveEvent to change the color and the size of the ellipses when the mouse is over them. To draw a temporary line between the point clicked and the mouse cursor I have to use MouseMoveEvent into the scene. However, when I do that, the HoverEvents of the items don't work anymore ! How can I use both MouseMoveEvent of the scene and HoverEvents of the items ?
void GraphicsScene::mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent)
{
for (int i = 0; i < pointList.size(); ++i) {
if (pointList[i]->over == 1){
pointList[i]->press();
lineActivated=true;
tempLine.setLine(pointList[i]->x(),pointList[i]->y(),pointList[i]->x(),pointList[i]->y());
}
}
}
void GraphicsScene::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
if(lineActivated){
const QPointF pos = event->scenePos();
tempLine.setP2(pos);
}
}
void Point::hoverEnterEvent(QGraphicsSceneHoverEvent *event)
{
pen.setColor(Qt::green);
pen.setWidth(2);
this->setPen(pen);
over=true;
qDebug("enter");
update();
}
void Point::hoverLeaveEvent(QGraphicsSceneHoverEvent *event)
{
if(isClicked==false){
pen.setColor(Qt::lightGray);
pen.setWidth(1);
over=false;
this->setPen(pen);
qDebug("leave");
update();
}
}
By default QGraphicsScene::mouseMoveEvent sends the necessary information to handle the hover event of the items but override that method you eliminate that behavior. The solution is to call the parent method.
#include <QtWidgets>
class GraphicsScene: public QGraphicsScene{
public:
using QGraphicsScene::QGraphicsScene;
protected:
void mousePressEvent(QGraphicsSceneMouseEvent *event){
if(!m_lineitem){
m_lineitem = new QGraphicsLineItem;
addItem(m_lineitem);
}
QLineF l(event->scenePos(), event->scenePos());
m_lineitem->setLine(l);
QGraphicsScene::mousePressEvent(event);
}
void mouseMoveEvent(QGraphicsSceneMouseEvent *event){
if(m_lineitem){
QLineF l(m_lineitem->line().p1(), event->scenePos());
m_lineitem->setLine(l);
}
QGraphicsScene::mouseMoveEvent(event);
}
private:
QGraphicsLineItem *m_lineitem = nullptr;
};
class Point: public QGraphicsEllipseItem{
public:
Point(QGraphicsItem *parent=nullptr): QGraphicsEllipseItem(parent){
setRect(QRectF(-5, -5, 10, 10));
QPen pen;
pen.setColor(Qt::lightGray);
pen.setWidth(1);
setPen(pen);
setAcceptHoverEvents(true);
}
protected:
void hoverEnterEvent(QGraphicsSceneHoverEvent *event){
QPen pen;
pen.setColor(Qt::green);
pen.setWidth(2);
setPen(pen);
QGraphicsEllipseItem::hoverEnterEvent(event);
}
void hoverLeaveEvent(QGraphicsSceneHoverEvent *event){
QPen pen;
pen.setColor(Qt::lightGray);
pen.setWidth(1);
setPen(pen);
QGraphicsEllipseItem::hoverLeaveEvent(event);
}
};
int main(int argc, char *argv[]){
QApplication a(argc, argv);
GraphicsScene *scene = new GraphicsScene;
QGraphicsView w(scene);
w.setRenderHint(QPainter::Antialiasing, true);
w.fitInView(QRectF(0, 0, 100, 100), Qt::KeepAspectRatio);
for(const QPointF & p: {QPointF(10.0, 10.0), QPointF(90.0, 20.0), QPointF(30.0, 40.0)}){
Point *it = new Point();
scene->addItem(it);
it->setPos(p);
}
w.resize(640, 480);
w.show();
return a.exec();
}
I'm going to deploy the qtvirtualkeyboard in my widget-based application like so:
#include <QtWidgets>
int main(int argc, char *argv[]) {
qputenv("QT_IM_MODULE", QByteArray("qtvirtualkeyboard"));
QApplication app(argc, argv);
QMainWindow window;
QLineEdit input(&window);
input.move(250, 250);
window.show();
return app.exec();
}
But the only issue is that the virtual keyboard input panel hides the underlying widgets and cover them!
How should I achieve this?
Is there any document or solution for widgets-based applications?
you just need to add this line in main.cpp
qputenv("QT_IM_MODULE", QByteArray("qtvirtualkeyboard"));
and will work Virtual Keyboard in Qtwidgets))
Finally got the solution!
You just need to call QGuiApplication::inputMethod() to get the application-wide Qt input method and then call QInputMethod::keyboardRectangle() and QInputMethod::isVisible() to get input method properties then remain a calculation based on your widget position and keyboard coordinate, here is a full-working sample to share:
lineedit.h:
class LineEdit :public QLineEdit {
Q_OBJECT
public:
LineEdit(QWidget *parent = nullptr);
LineEdit(const QString&, QWidget *parent = nullptr);
protected:
bool event(QEvent*) override;
private:
bool _moved = false;
int _lastDiff = 0;
};
lineedit.cpp:
LineEdit::LineEdit(QWidget *parent) :QLineEdit(parent) {
setAttribute(Qt::WA_InputMethodEnabled, true);
setInputMethodHints(inputMethodHints() | Qt::InputMethodHint::ImhDigitsOnly);
}
LineEdit::LineEdit(const QString& txt, QWidget *parent) : QLineEdit(txt, parent) {
setAttribute(Qt::WA_InputMethodEnabled, true);
setInputMethodHints(inputMethodHints() | Qt::InputMethodHint::ImhDigitsOnly);
}
bool LineEdit::event(QEvent* e) {
const auto keyboard_rect = QGuiApplication::inputMethod()->keyboardRectangle();
const auto keyboard_visible = QGuiApplication::inputMethod()->isVisible();
const auto global_y = QWidget::mapToGlobal(rect().topLeft()).y() + height();
const auto k_global_y = keyboard_rect.topLeft().y();
const auto diff = k_global_y - global_y;
const auto need_to_move = diff < 0;
/* move main widget */
if (keyboard_visible && !_moved && need_to_move) {
_moved = true;
_lastDiff = diff;
const auto g = parentWidget()->frameGeometry();
parentWidget()->move(g.x(), g.y() - qAbs(_lastDiff));
}
/* roll back */
if (!keyboard_visible && _moved) {
_moved = false;
const auto g = parentWidget()->frameGeometry();
parentWidget()->move(g.x(), g.y() + qAbs(_lastDiff));
}
return QLineEdit::event(e);
}
main.cpp:
#include <QtWidgets>
#define W 1024
#define H 768
int main(int argc, char *argv[]) {
qputenv("QT_IM_MODULE", QByteArray("qtvirtualkeyboard"));
QApplication app(argc, argv);
QMainWindow window(nullptr, Qt::FramelessWindowHint);
LineEdit lineedit1(&window);
lineedit1.move(100, 450);
LineEdit lineedit2(&window);
lineedit2.move(100, 100);
window.resize(W, H);
window.show();
return app.exec();
}
results:
I'm trying to change the background color of a QMenu* object it does not work with setStyleSheet(), nor with setPalette().
I read this article but the guy says that I should add this line:
app.setStyle(QStyleFactory::create("fusion"));
I'm not sure what is app, I tried several combinations but it does not work.
Thanks!
You probably forgot to set QMenu's parent:
#include <QtGui>
class Window : public QWidget
{
public:
Window(QWidget *parent = 0) : QWidget(parent) {}
void contextMenuEvent(QContextMenuEvent *event)
{
QMenu menu(this);
menu.addAction(new QAction("Item 1", this));
menu.addAction(new QAction("Item 2", this));
menu.exec(event->pos());
}
};
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Window *window = new Window;
window->setStyleSheet("QMenu::item:selected { background-color: green; }");
window->show();
return app.exec();
}
in my project i use a EventFilter for widgets, that are in a QHBoxLayout.
If i clicked on an a widget, i want to draw a transparent overlay with blue color over the clicked widget.
Is there a way to implement this?
greetings
This answer is in a series of my overlay-related answers: first, second, third.
One way of doing it is:
Have a semi-transparent overlay widget that is also transparent to mouse events.
In the event filter, track the clicks and the resizing of the objects by adjusting the overlay's geometry to match that of the target widget.
The self-contained example below works under both Qt 4 and Qt 5 and does what you want.
// https://github.com/KubaO/stackoverflown/tree/master/questions/overlay-19199863
#include <QtGui>
#if QT_VERSION >= QT_VERSION_CHECK(5,0,0)
#include <QtWidgets>
#endif
class Overlay : public QWidget {
public:
explicit Overlay(QWidget *parent = nullptr) : QWidget(parent) {
setAttribute(Qt::WA_NoSystemBackground);
setAttribute(Qt::WA_TransparentForMouseEvents);
}
protected:
void paintEvent(QPaintEvent *) override {
QPainter(this).fillRect(rect(), {80, 80, 255, 128});
}
};
class OverlayFactoryFilter : public QObject {
QPointer<Overlay> m_overlay;
public:
explicit OverlayFactoryFilter(QObject *parent = nullptr) : QObject(parent) {}
protected:
bool eventFilter(QObject *obj, QEvent *ev) override {
if (!obj->isWidgetType()) return false;
auto w = static_cast<QWidget*>(obj);
if (ev->type() == QEvent::MouseButtonPress) {
if (!m_overlay) m_overlay = new Overlay;
m_overlay->setParent(w);
m_overlay->resize(w->size());
m_overlay->show();
}
else if (ev->type() == QEvent::Resize) {
if (m_overlay && m_overlay->parentWidget() == w)
m_overlay->resize(w->size());
}
return false;
}
};
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
OverlayFactoryFilter factory;
QWidget window;
QHBoxLayout layout(&window);
for (auto text : { "Foo", "Bar", "Baz "}) {
auto label = new QLabel{text};
layout.addWidget(label);
label->installEventFilter(&factory);
}
window.setMinimumSize(300, 250);
window.show();
return a.exec();
}
In the overlay widget constructor:
setWindowFlags(Qt::Widget | Qt::FramelessWindowHint | Qt::ToolTip | Qt::WindowStaysOnTopHint);
setAttribute(Qt::WA_NoSystemBackground, true);
setAttribute(Qt::WA_TranslucentBackground, true);
In the window that owns that widget:
overlay_ = new RtspOverlay(this);
overlay_->show();
I've created 2 classes, each:
has QWidget as a parent
has Q_OBJECT macros
inits some actions, creates menubar and toolbar, and connects actions to them
Then I created the main program file, created QMainWindow, and init my two classes by qmainwnd pointer.
And what I've got - menu works, the second toolbar works, but the first toolbar (created by class 1) doesn't respond to mouse clicks.
What happed with it? Why I can not even move this first toolbar or click its buttons?
Here a sample:
main.cpp
#include <QApplication>
#include <QMainWindow>
#include "CModDocument.h"
#include "CModEditor.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QMainWindow wnd;
// init CA
CModDocument a(&wnd);
// init CB
CModEditor b(&wnd);
wnd.show();
return app.exec();
}
CModDocument.h
#ifndef CMODDOCUMENT_H
#define CMODDOCUMENT_H
#include <QWidget>
QT_BEGIN_NAMESPACE
class QAction;
class QToolBar;
class QMainWindow;
QT_END_NAMESPACE
class CModDocument: public QWidget
{
Q_OBJECT
public:
CModDocument(QWidget *parent = 0);
QMainWindow *getMainWnd();
public slots:
void newFile();
void open();
bool save();
bool saveAs();
private:
void createActions();
void createToolBars();
void interCom();
QMainWindow *mainWnd;
QToolBar *fileToolBar;
QAction *newAct;
QAction *openAct;
QAction *saveAct;
QAction *saveAsAct;
};
#endif // CMODDOCUMENT_H
CModDocument.cpp
#include <QtGui>
#include <QDebug>
#include "CModDocument.h"
CModDocument::CModDocument( QWidget *parent )
: QWidget( parent )
, mainWnd( (QMainWindow*)parent )
{
createActions();
createToolBars();
interCom();
mainWnd->statusBar()->showMessage(tr("Ready"));
}
void CModDocument::newFile()
{
qDebug() << "newFile";
}
void CModDocument::open()
{
qDebug() << "open";
}
bool CModDocument::save()
{
qDebug() << "save";
bool retVal;
return retVal;
}
bool CModDocument::saveAs()
{
qDebug() << "saveAs";
bool retVal;
return retVal;
}
void CModDocument::createActions()
{
newAct = new QAction(tr("&New"), this);
newAct->setShortcuts(QKeySequence::New);
newAct->setStatusTip(tr("Create a new file"));
openAct = new QAction(tr("&Open..."), this);
openAct->setShortcuts(QKeySequence::Open);
openAct->setStatusTip(tr("Open an existing file"));
saveAct = new QAction(tr("&Save"), this);
saveAct->setShortcuts(QKeySequence::Save);
saveAct->setStatusTip(tr("Save the document to disk"));
saveAsAct = new QAction(tr("Save &As..."), this);
saveAsAct->setShortcuts(QKeySequence::SaveAs);
saveAsAct->setStatusTip(tr("Save the document under a new name"));
}
void CModDocument::createToolBars()
{
fileToolBar = mainWnd->addToolBar(tr("File"));
fileToolBar->addAction(newAct);
fileToolBar->addAction(openAct);
fileToolBar->addAction(saveAct);
}
void CModDocument::interCom()
{
connect(newAct, SIGNAL(triggered()), this, SLOT(newFile()));
connect(openAct, SIGNAL(triggered()), this, SLOT(open()));
connect(saveAct, SIGNAL(triggered()), this, SLOT(save()));
connect(saveAsAct, SIGNAL(triggered()), this, SLOT(saveAs()));
}
CModEditor.h
#ifndef CMODEDITOR_H
#define CMODEDITOR_H
#include <QWidget>
// #include "CModEdiWidget.h"
QT_BEGIN_NAMESPACE
class QMainWindow;
class QAction;
class QMenu;
class QMenuBar;
class QToolBar;
QT_END_NAMESPACE
class CModEditor : public QWidget
{
Q_OBJECT
public:
CModEditor(QWidget *parent = 0);
public slots:
void cut();
private:
void createActions();
void createToolBars();
void interCom();
QAction *cutAct;
QToolBar *editToolBar;
// parent
QMainWindow *mainWnd;
};
#endif
CModEditor.cpp
#include <QtGui>
#include <QDebug>
#include "CModEditor.h"
CModEditor::CModEditor(QWidget *parent)
: QWidget(parent)
, mainWnd( (QMainWindow*)parent )
{
createActions();
createToolBars();
interCom();
}
void CModEditor::cut()
{
qDebug() << "cut";
}
void CModEditor::createActions()
{
cutAct = new QAction(tr("Cu&t"), this);
cutAct->setShortcuts(QKeySequence::Cut);
cutAct->setStatusTip(tr("Cut the current selection's contents to the clipboard"));
}
void CModEditor::createToolBars()
{
editToolBar = mainWnd->addToolBar(tr("Edit"));
editToolBar->addAction(cutAct);
editToolBar->setIconSize(QSize(16, 16));
}
void CModEditor::interCom()
{
connect(cutAct, SIGNAL(triggered()), this, SLOT(cut()));
}
build.pro
CONFIG -= app_bundle
HEADERS = CModDocument.h CModEditor.h
SOURCES = CModDocument.cpp CModEditor.cpp main.cpp
The problem seems to be that you are trying to configure the QMainWindow as the parent to two QWidgets. I modified your main() function as follows and it worked:
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QMainWindow wnd;
QWidget w;
// init CA
CModDocument a(&wnd, &w);
// init CB
CModEditor b(&wnd, &w);
wnd.show();
return app.exec();
}
Notice the new QWidget w that parents a and b. I'm not even sure my approach is adequate (it probably isn't). I think it is better to add a QLayout to w and add a and b to that QLayout. Then you could set w as wnd's central widget.