Hello,
I have a program that uses the Qt Graphics Framework to draw different graphic items. For that I'm using the QGraphicsItem, QGraphicsScene and the QGraphicsView subclasses.
I put the QGraphicsView subclass in a QMainWindow (a subclass too).
When I'm starting my program I have 2 scroll bars one horizontal and one vertical. When I'm resizing the QMainWindow these scroll bars are remaining always with the same size ,or may be position, I don't know how to call it but they don't have the normal behavior...
When I put an item on the scene but in the border between the visible and the not visible part of the scene i.e. the item appears not entirely or when I put the item entirely in the not visible, by the view, zone the scroll bars are remaining too at the same state ...
The thing I want to have is that these scroll bars to be adaptable when I resize the main window or when I put some item outside the visible zone.
I hope that my explanation is clearly enough 
Here is some source code of how I create the main windows with the view and the scene:
Viewer.h
#ifndef VIEWER_H_
#define VIEWER_H_
#include <QtGui>
class Scheme;
public:
Viewer(Scheme *scheme);
~Viewer();
protected:
};
#endif /* VIEWER_H_ */
#ifndef VIEWER_H_
#define VIEWER_H_
#include <QtGui>
class Scheme;
class Viewer : public QGraphicsView {
public:
Viewer(Scheme *scheme);
~Viewer();
protected:
virtual void mouseMoveEvent(QMouseEvent *event);
virtual void dragEnterEvent(QDragEnterEvent *event);
virtual void dropEvent(QDropEvent *event);
virtual void resizeEvent ( QResizeEvent * );
};
#endif /* VIEWER_H_ */
To copy to clipboard, switch view to plain text mode
Viewer.cpp
#include "Viewer.h"
#include "Scheme.h"
setAcceptDrops(true);
}
Viewer::~Viewer(){ }
}
}
}
scene()->setSceneRect(0,0,width(), height());
}
#include "Viewer.h"
#include "Scheme.h"
Viewer::Viewer(Scheme *scheme) : QGraphicsView(scheme){
setRenderHint(QPainter::Antialiasing);
setAcceptDrops(true);
setDragMode(QGraphicsView::RubberBandDrag);
}
Viewer::~Viewer(){ }
void Viewer::mouseMoveEvent(QMouseEvent *event){
QGraphicsView::mouseMoveEvent(event);
}
void Viewer::dragEnterEvent(QDragEnterEvent *event){
QGraphicsView::dragEnterEvent(event);
}
void Viewer::dropEvent(QDropEvent *event){
QGraphicsView::dropEvent(event);
}
void Viewer::resizeEvent ( QResizeEvent * ){
scene()->setSceneRect(0,0,width(), height());
}
To copy to clipboard, switch view to plain text mode
Scheme.h
#ifndef SCHEME_H_
#define SCHEME_H_
#include <QGraphicsScene>
#include "Component.h"
Q_OBJECT
public:
~Scheme();
protected:
virtual void dragEnterEvent(QGraphicsSceneDragDropEvent * event );
virtual void dragMoveEvent(QGraphicsSceneDragDropEvent *event);
virtual void dropEvent (QGraphicsSceneDragDropEvent * event );
};
#ifndef SCHEME_H_
#define SCHEME_H_
#include <QGraphicsScene>
#include "Component.h"
class Scheme : public QGraphicsScene {
Q_OBJECT
public:
Scheme(QMenu *compMenu, QObject *parent = 0);
~Scheme();
protected:
void mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent);
void mouseMoveEvent(QGraphicsSceneMouseEvent *mouseEvent);
void mouseReleaseEvent(QGraphicsSceneMouseEvent *mouseEvent);
virtual void dragEnterEvent(QGraphicsSceneDragDropEvent * event );
virtual void dragMoveEvent(QGraphicsSceneDragDropEvent *event);
virtual void dropEvent (QGraphicsSceneDragDropEvent * event );
};
To copy to clipboard, switch view to plain text mode
Scheme.cpp
#include <QtGui>
#include <QLabel>
#include "Scheme.h"
line = 0;
mode = MoveComponent;
componentType = Component::EventIO;
this->compMenu = compMenu;
compColor = Qt::black;
}
Scheme::~Scheme(){
}
}
}
void Scheme::dragEnterEvent(QGraphicsSceneDragDropEvent * event ){
}
void Scheme::dropEvent (QGraphicsSceneDragDropEvent * event ){
}
void Scheme::dragMoveEvent(QGraphicsSceneDragDropEvent *event){
qDebug("Drag move event");
}
#include <QtGui>
#include <QLabel>
#include "Scheme.h"
Scheme::Scheme(QMenu *compMenu, QObject *parent) : QGraphicsScene(parent) {
line = 0;
mode = MoveComponent;
componentType = Component::EventIO;
this->compMenu = compMenu;
compColor = Qt::black;
}
Scheme::~Scheme(){
void Scheme::mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent){
QGraphicsScene::mousePressEvent(mouseEvent);
}
void Scheme::mouseMoveEvent(QGraphicsSceneMouseEvent *mouseEvent){
QGraphicsScene::mouseMoveEvent(mouseEvent);
}
void Scheme::mouseReleaseEvent(QGraphicsSceneMouseEvent *mouseEvent){
QGraphicsScene::mouseReleaseEvent(mouseEvent);
}
void Scheme::dragEnterEvent(QGraphicsSceneDragDropEvent * event ){
QGraphicsScene::dragEnterEvent(event);
}
void Scheme::dropEvent (QGraphicsSceneDragDropEvent * event ){
QGraphicsScene::dropEvent(event);
}
void Scheme::dragMoveEvent(QGraphicsSceneDragDropEvent *event){
qDebug("Drag move event");
}
To copy to clipboard, switch view to plain text mode
MainWindow.h
#ifndef MAINWINDOW_H_
#define MAINWINDOW_H_
#include <QtGui>
class Scheme;
class Viewer;
class DragWidget;
Q_OBJECT
public:
MainWindow();
~MainWindow();
private:
Scheme *scheme; //list of all drawings that are participation in the scheme
Viewer *view; //view port
};
#endif /* MAINWINDOW_H_ */
#ifndef MAINWINDOW_H_
#define MAINWINDOW_H_
#include <QtGui>
class Scheme;
class Viewer;
class DragWidget;
class MainWindow : public QMainWindow {
Q_OBJECT
public:
MainWindow();
~MainWindow();
private:
QWidget *viewWidget;
QHBoxLayout *viewLayout;
Scheme *scheme; //list of all drawings that are participation in the scheme
Viewer *view; //view port
};
#endif /* MAINWINDOW_H_ */
To copy to clipboard, switch view to plain text mode
MainWindow.cpp
#include <QtGui>
#include <QLabel>
#include <QPainterPath>
#include <QGraphicsRectItem>
#include <QHBoxLayout>
#include <QRect>
#include "MainWindow.h"
#include "Scheme.h"
#include "Viewer.h"
scheme = new Scheme(itemMenu);
scheme->setMode(Scheme::MoveComponent);
scheme
->setSceneRect
(QRectF(0,
0,
1000,
1000));
view = new Viewer(scheme);
view
->setRenderHint
(QPainter::Antialiasing);
view->centerOn(0,0);
viewLayout->addWidget(view);
viewWidget->setLayout(viewLayout);
setCentralWidget(viewWidget);
}
MainWindow::~MainWindow(){
}
#include <QtGui>
#include <QLabel>
#include <QPainterPath>
#include <QGraphicsRectItem>
#include <QHBoxLayout>
#include <QRect>
#include "MainWindow.h"
#include "Scheme.h"
#include "Viewer.h"
MainWindow::MainWindow() : QMainWindow() {
scheme = new Scheme(itemMenu);
scheme->setMode(Scheme::MoveComponent);
scheme->setSceneRect(QRectF(0, 0, 1000, 1000));
view = new Viewer(scheme);
view->setRenderHint(QPainter::Antialiasing);
view->centerOn(0,0);
viewLayout = new QHBoxLayout();
viewLayout->addWidget(view);
viewWidget = new QWidget;
viewWidget->setLayout(viewLayout);
setCentralWidget(viewWidget);
}
MainWindow::~MainWindow(){
}
To copy to clipboard, switch view to plain text mode
I removed some part of the code and I left just the constructors because I think this is the most important and I suppose that I should add something to the Viewer constructor in way that its scroll bars to become "adjustable"
If you have any ideas ....
Best regards,
Anton
PS:
this is the main():
#include <QtGui>
#include <QCoreApplication>
#include "MainWindow.h"
int main(int argc, char *argv[])
{
MainWindow mainWindow;
mainWindow.setGeometry(0, 0, 1000, 1000);
mainWindow.show();
return a.exec();
}
#include <QtGui>
#include <QCoreApplication>
#include "MainWindow.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow mainWindow;
mainWindow.setGeometry(0, 0, 1000, 1000);
mainWindow.show();
return a.exec();
}
To copy to clipboard, switch view to plain text mode
scroll bars, qgraphicsview, qgraphicsscene, ...
Reply With Quote
Bookmarks