I want to know how to set window title in Qt in maximized mode.
window->setWindowtitle("window");
But this does not work in maximized mode.
playback_main *pbw = new playback_main;
pbw->setWindowTitle("PlayBack");
pbw->showMaximized();
This is not working.
Your code works for me on a QMainWindow in, admittedly, qt 4.7. Do you need to force an update with either of:
pbw->update();
qApp->processEvents();
is pbw a QMainWindow or just a widget?
I've tried the following code on linux which works too:
#include <QApplication>
#include <QMainWindow>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QMainWindow w;
w.setWindowTitle("testing");
w.showMaximized();
return a.exec();
}
Related
I am trying to hide the MainWindow of my Qt desktop app during startup, and to show a splashscreen. Both only happens after the loading phase, even though I call both splash.show() and window.hide() before the loading phase. I tried to split loading phase and constructor, but result is the same. How can I achieve both before the loading phase ?
Update 1
To display the splash screen, I had to add a call to QApplication::processEvents()
Update 2
The black window was actually not the MainWindow, but a ghost window that popped because scrollArea->setVisible(true) was called in the constructor.
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QPixmap pixmap(QStringLiteral(":/ressources/icons/icon.png"));
QSplashScreen splash(pixmap);
splash.show();
MainWindow window; // this loads for 5-6 seconds
a.processEvents();
window.showLoginPrompt();
splash.finish(&window);
return a.exec();
}
Based on your code and some example I could make it run like you are trying to do.
You only need to call your promptLogin function instead.
#include <QApplication>
#include <QTimer>
#include <QSplashScreen>
#include "mainwindow.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QSplashScreen *splash = new QSplashScreen;
splash->setPixmap(QPixmap("D:\\Projects\\SplashScreen\\TestSplashScreen\\splash.png"));
splash->show();
MainWindow mainWin;
QTimer::singleShot(2500, splash, SLOT(close()));
QTimer::singleShot(2500, &mainWin, SLOT(show()));
return app.exec();
}
I am trying to make the QtVirtualKeyboard example work with QQuickWidget instead of QQuickView. For QuickView, I use the following main.cpp code, which works fine for me:
#include <QQuickView>
#include <QGuiApplication>
#include <QQmlEngine>
int main(int argc, char *argv[])
{
qputenv("QT_IM_MODULE", QByteArray("qtvirtualkeyboard"));
QGuiApplication app(argc, argv);
QQuickView view(QString("qrc:/%2").arg(MAIN_QML));
view.setResizeMode(QQuickView::SizeRootObjectToView);
view.show();
return app.exec();
}
I run into problems, when changing to QQuickWidgets with the following implementation of main.cpp:
#include <QQuickWidget>
#include <QApplication>
#include <QQmlEngine>
int main(int argc, char *argv[])
{
qputenv("QT_IM_MODULE", QByteArray("qtvirtualkeyboard"));
QApplication app(argc, argv);
QQuickWidget w(QString("qrc:/%2").arg(MAIN_QML));
w.setResizeMode(QQuickWidget::SizeRootObjectToView);
w.show();
return app.exec();
}
When I hit the input fields, the virtual keyboard shows up, but when I start typing at the keyboard, I get the message "input method is not set", which seems to be related to the input method plugin. No chars appear in the input fields.
Any ideas? The QML-code didn't change between the above variants of main.cpp
BTW: I am using Linux, gcc, Qt 5.9.0, EGLFS plugin
Thanks for any suggestions!
Regards,
Patrick
Found the solution for QML looking through inputMethod documentation. Following workaround works for me:
TextArea {
...
onActiveFocusChanged: {
if(activeFocus) {
Qt.inputMethod.update(Qt.ImQueryInput)
}
}
}
Works with other controls as well.
Of course InputPanel should be defined in ApplicationWindow like this:
ApplicationWindow {
...
InputPanel {
id: inputPanel
...
}
}
I want to create custom Layout alike here: http://doc.qt.io/qt-5/qtwidgets-layouts-flowlayout-flowlayout-cpp.html
I want some methood to put checkbox on top of custom button. For now there are
setGeometry(QRect(QPoint(...
methods for either button and checkbox but whether I'm doing it for button or checkobox first still checkbox appears "under" the button and I can't see/click it.
How can I put checkbox on top of button there?
Simply make the checkbox a child of the button and call setGeometry relative to the button. Children are always drawn on top of their parents.
QPushButton button("Hello World!", &w);
button.setGeometry(0,0,100,100);
button.show();
QCheckBox checkBox(&button);
checkBox.setGeometry(button.rect());
checkBox.show();
No need to put the checkbox into a layout.
I have just made this snippet to check the checkbox on the top of the button and it works for me.
#include "mainwindow.h"
#include <QApplication>
#include <QPushButton>
#include <QCheckBox>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QWidget w;
QPushButton button("Hello World!", &w);
button.setGeometry(0,0,100,100);
button.show();
QCheckBox checkBox(&w);
checkBox.setGeometry(30,30,50,50);
checkBox.show();
w.show();
return a.exec();
}
and here is if you will change the order of "parenting" and want checkbox still be on the top:
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QWidget w;
QCheckBox checkBox(&w);
checkBox.setGeometry(30,30,50,50);
checkBox.show();
QPushButton button("Hello World!", &w);
button.setGeometry(0,0,100,100);
button.show();
checkBox.setParent(NULL);
checkBox.setParent(&w);
w.show();
return a.exec();
}
I watched VoidRealm tutorial, and he easily include QtGui and start using it! but i do the same thing and it doesnt work for me! for example my code doesnt know the QWidget until i include QLabel! or all other Gui element...
#include <QApplication>
#include <QtGui>
#include <QtCore>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QWidget *win = new QWidget;
win->setWindowTitle("MBS");
QGridLayout *gLay = new QGridLayout;
QLabel *label1 = new QLabel("Name: ");
win->show();
return a.exec();
}
In Qt5 most of the previously known as QtGui functionality now is being called QtWidgets.
So try to write #include <QtWidgets>.
Basically, I want a simple pushButton with a colorful text which when pressed exits the application.
Why cant I press PushButton in this simple program. I am using QT 4.6 on Arch x86_64.
#include <QtGui/QApplication>
#include <QLabel>
#include <QPushButton>
#include<QtGui>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QMainWindow *Main=new QMainWindow;
QPushButton *button = new QPushButton(Main);
QLabel *label = new QLabel(Main);
label->setText("<h2><i>Hello</i> ""<font color=red>Qt!</font></h2>");
label->setVisible(true);
QObject::connect(button, SIGNAL(clicked()),label, SLOT(close()));
label->setAlignment(Qt::AlignCenter|Qt::AlignVCenter);
label->setWindowTitle("HelloWorld Test Program");
Main->show();
return a.exec();
}
Beside the use of a button class that will allow you to display rich text, you also need to make sure your connections are correct.
In your example, you're connecting the clicked signal of the button to the clear() slot of the label, which is non-sense.
To exit your app when the button is clicked, you need to close the main window. Here is the code to get the right connection :
QObject::connect(button, SIGNAL(clicked()),Main, SLOT(close()));
Changing this single line of code in your example is not enough, because your label is drawn on top of your button, so it's not possible to graphically click on it. You need to hide your label and put some text into your button :
button->setText("Hello");
label->setVisible(false);
Regarding the rich text feature in a QPushButton, AFAIK it is not possible to do it with a QPushButton.
UPDATE :
Here is a way to put some richtext on a QPushButton. It uses the solution described by my comment : painting a QTextDocument onto a pixmap and setting this pixmap as the button's icon.
#include <QtGui/QApplication>
#include <QLabel>
#include <QPushButton>
#include <QtGui>
#include <QTextDocument>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QMainWindow *Main=new QMainWindow;
QPushButton *button = new QPushButton(Main);
QTextDocument Text;
Text.setHtml("<h2><i>Hello</i> ""<font color=red>Qt!</font></h2>");
QPixmap pixmap(Text.size().width(), Text.size().height());
pixmap.fill( Qt::transparent );
QPainter painter( &pixmap );
Text.drawContents(&painter, pixmap.rect());
QIcon ButtonIcon(pixmap);
button->setIcon(ButtonIcon);
button->setIconSize(pixmap.rect().size());
QObject::connect(button, SIGNAL(clicked()),Main, SLOT(close()));
Main->show();
return a.exec();
}
Take a look here. Widget called QwwRichTextButton.
The QwwRichTextButton widget provides a button that can display rich text.