CODEWITHSUNDEEP
c++qt
Calaf
Calaf

Reputation: 10847

Toggling among QWidgets

I would like to toggle among QWidgets. In the code below, I'd like sceneWidget to show either view1 or view2, depending on which button has been pressed.

scene1

scene2

But the code hardly does that. What is wrong? (Aside from the very ugly global variables, which I leave for a next step.)

#include <QWidget>
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QPushButton>

#include <QApplication>
#include <QGraphicsView>
#include <QGraphicsScene>
#include <QGraphicsEllipseItem>

QGraphicsView* getView(int x, int y, int w, int h)
{
    QGraphicsScene* scene = new QGraphicsScene;
    scene->addItem(new QGraphicsEllipseItem(x,y,w,h));
    QGraphicsView* view = new QGraphicsView(scene);
    return view;
}

QVBoxLayout* rightVbox;
QGraphicsView* view1;
QGraphicsView* view2;

void c1() {
    rightVbox->insertWidget(0, view1);
}

void c2() {
    rightVbox->insertWidget(0, view2);
}

int main(int argc, char* argv[])
{
    QApplication app(argc, argv);

    view1 = getView(0,0,100,50);
    view2 = getView(0,0,50,100);

    QWidget* mainWidget = new QWidget;
    QHBoxLayout* hbox = new QHBoxLayout(mainWidget);

    QWidget* buttonsWidget = new QWidget;
    hbox->addWidget(buttonsWidget);
    QVBoxLayout* leftVbox = new QVBoxLayout(buttonsWidget);
    QPushButton* button1 = new QPushButton("Scene 1", buttonsWidget);
    QPushButton* button2 = new QPushButton("Scene 2", buttonsWidget);
    leftVbox->addWidget(button1);
    leftVbox->addWidget(button2);

    QWidget* sceneWidget = new QWidget;
    hbox->addWidget(sceneWidget);

    rightVbox = new QVBoxLayout(sceneWidget);
    rightVbox->insertWidget(0, view1);

    QObject::connect(button1, &QPushButton::clicked, c1);
    QObject::connect(button2, &QPushButton::clicked, c2);

    mainWidget->show();
    return app.exec();
}

Upvotes: 0

Views: 81

Answers (2)

milianw
milianw

Reputation: 5336

Use a QStackedWidget for that purpose.

http://doc.qt.io/qt-4.8/qstackedwidget.html

Upvotes: 2

Erik
Erik

Reputation: 2208

To do what you want, you should be able to simply use show and hide on the two items. Quoting from the QBoxLayout page:

Calling QWidget::hide() on a widget also effectively removes the widget from the layout until QWidget::show() is called.

I was able to switch between the two widgets with the buttons by doing this in main():

[...]
rightVbox = new QVBoxLayout(sceneWidget);
rightVbox->insertWidget(0, view1);
rightVbox->insertWidget(0, view2);
view2->hide();
[...]

and then change your two functions c1 and c2 to: 

void c1() {
  view1->show();
  view2->hide();
}

void c2() {
  view2->show();
  view1->hide();

}

Does this do what you had in mind?

Upvotes: 0

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