I Have the version of Qt that is built into ubuntu 11.10. And am trying to use a QDockWidget that cannot actually dock (basically, I just want a window that floats. I don't want to just make the view be a top level view because then I would have the OS window bar up there, which I don't want, and if I were to hide it, then the window won't be movable).
So, I basically make a new Qt Gui project, and don't change any of the files, except for the mainwindow.cpp file, which I change to:
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDockWidget>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
QDockWidget *dockWidget = new QDockWidget(this);
// Without window management and attached to mainwindow (central widget)
dockWidget->setFloating( true );
// resize by frame only - not positional moveable
dockWidget->setFeatures( QDockWidget::DockWidgetMovable );
// never dock in mainwindow
dockWidget->setAllowedAreas( Qt::NoDockWidgetArea );
// title
dockWidget->setWindowTitle( "Dock Widget" );
// add contents. etc etc....
dockWidget->show();
}
MainWindow::~MainWindow()
{
delete ui;
}
The problem is that when I go to move the widget, the whole program crashes. I want to know if I am doing something very wrong, or if there is just a bug in qt.
You made the widget floating but not floatable.
dockWidget->setFeatures( QDockWidget::DockWidgetMovable |
QDockWidget::DockWidgetFloatable );
And you can also have a movable frameless window, by handling the mouse dragging yourself through mousePressEvent, mouseReleaseEvent and mouseMoveEvent.
How to hide the now useless float button
Based on QDockWidget source code, the "float button" is not shown if there is a title bar widget:
dockWidget->setTitleBarWidget(new QLabel("Dock Widget", dockWidget));
Or since it has a name (which isn't documented), you can hide it explicitly:
QAbstractButton * floatButton =
dockWidget->findChild<QAbstractButton*>("qt_dockwidget_floatbutton");
if(floatButton)
floatButton->hide();
Related
I have added a QTabWidget which is checkable. I want to hide all tabs (panes only) when the TabBar is unchecked and vice versa. Is there any way to make only pane invisible and tab bar will not disappear?
I add the image reference related to what I want in output:
Initially both tab pane is minimize and when i click on the tab it will maximize:
after clicking pane is maximize and again i click it will minimize and vice versa:
Instead of using QTabWidget. You can use a QTabBar and implement the functionality you desire hiding the corresponding widget.
here is some sample code of a new widget application example within qt creator
#include "MainWindow.h"
#include "ui_MainWindow.h"
#include <QTabBar>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
m_tabbar = new QTabBar(this->centralWidget());
m_tabbar->addTab("Hello");
m_tabbar->addTab("World");
m_tabbar->setShape(QTabBar::RoundedWest);
m_tabbar->setGeometry(0,0,this->height(), 200);
connect(m_tabbar, SIGNAL(tabBarClicked(int)), this, SLOT(changedTab(int)));
}
MainWindow::~MainWindow()
{
delete ui;
}
void
MainWindow::changedTab(int idx)
{
m_tabbar->setCurrentIndex(idx);
ui->stackedWidget->setCurrentIndex(idx);
}
I am new to Qt. I took an example from here http://doc.qt.io/qt-5/qtmultimediawidgets-player-example.html.
Now I want to integrate the player in the main window. I created a Qt Widgets application project, I thought, that I would just have to edit the main window code:
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
Player* player;
MainWindow::setCentralWidget(player);
}
But it doesn't work and I get the following error:
Starting /home/***/Documents/build-player-Desktop-Debug/player...
The program has unexpectedly finished.
/home/***/Documents/build-player-Desktop-Debug/player crashed
How can I integrate a custom widget which is written in code, without ui in a main window? Thank you in advance.
In your own MainWindow class you can add a widget to the layout of that MainWindow:
MyMainWindow::MyMainWindow(QWidget *parent) :
...
{
this->ui->setupUi(this);
QLabel *myLabel = new QLabel();
this->layout()->addWidget(myLabel);
}
Well, player can't be placed on the window if it is not initialized.
Write something like that :
Player *player = new Player();
I usually add a QWidget (or whatever widget type I'm extending) to my .ui-file in the designer and then promote it to the actual derived type. See the Qt docs for more info on promoting widgets. This means that I can set the base widget's properties and design the window as usual but still get an instance of my special class when the UI is instantiated.
MainWindow:MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
SomeStupidWidget *ssw = new SomeStupidWidget(this); /* important! don't forget about passing "this" as argument, otherwise this could cause a memory leak(Qt handles object's lifetime by means of it's "owner" mechanism)*/
layout()->addWidget(ssw);
}
Here is my code, it's super simple:
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QGroupBox>
#include <QRadioButton>
#include <QVBoxLayout>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
QGroupBox* genderGroupBox = new QGroupBox("Gender", ui->centralWidget);
QVBoxLayout* genderGroupBoxLayout = new QVBoxLayout(genderGroupBox);
QRadioButton* maleRadioButton = new QRadioButton("Male", genderGroupBox);
QRadioButton* femaleRadioButton = new QRadioButton("Female", genderGroupBox);
genderGroupBoxLayout->addStretch();
}
but for some reason my program looks like this:
I've programmed in Qt quite a bit and I am totally baffled as to why the radio buttons aren't showing up inside the group box. I've tried explicitly adding them with
genderGroupBoxLayout->addWidget(maleRadioButton);
and manually adding the layout via
genderGroupBox->setLayout(genderGroupBoxLayout);
even though neither should be necessary because of how they were constructed. It looks like the radio buttons don't have any parent at all.
Anyone have any ideas?
I'm coding using Qt Creator 3.1.2 on a mac. Also the .ui file is empty of everything except centralWidget, which has a grid layout.
Please refer to the documentation :
When you use a layout, you do not need to pass a parent when
constructing the child widgets. The layout will automatically reparent
the widgets (using QWidget::setParent()) so that they are children of
the widget on which the layout is installed.
Your code should look like the following :
QGroupBox* genderGroupBox = new QGroupBox("Gender");
QVBoxLayout* genderGroupBoxLayout = new QVBoxLayout;
QRadioButton* maleRadioButton = new QRadioButton("Male");
QRadioButton* femaleRadioButton = new QRadioButton("Female");
genderGroupBoxLayout->addWidget(maleRadioButton);
genderGroupBoxLayout->addWidget(femaleRadioButton);
genderGroupBoxLayout->addStretch();
genderGroupBox->setLayout(genderGroupBoxLayout);
ui->centralWidget->layout()->addWidget(genderGroupBox);
So I'm making a web browser as my first Qt project (surprise!) and I'm wondering why calling setWindowState(Qt::WindowMaximized) is not changing window geometry. I have this code:
From mainwindow.h:
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
private:
Ui::MainWindow *ui;
};
From mainwindow.cpp:
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent), ui(new Ui::MainWindow)
{
ui->setupUi(this);
// this->geometry() is the same here...
setWindowState(Qt::WindowMaximized);
ui->webView->setGeometry(0, 60, geometry().width(), geometry().height()-60);
// ...as it is here.
}
As you may be able to tell, I'm trying to start the application with the window maximized and the QWebView also maximized. Basically, whenever the main window is resized, I also want to call ui->webView->setGeometry with the update height and width. But MainWindow::geometry doesn't seem to be updating. What am I doing wrong?
I would have to double check, but your geometry might not get updated properly until your main window gets a show event.
However, I would suggest you put your QWebView inside of a layout instead of trying to size it manually every time your main window changes size.
I am trying to make a form with data table appear when the button is clicked on thr main form. However, in practice second form 'blinks' - appears less than on second - and then vanished. What could be the reason and how that should be fixed?
Here is the derived form header and source files' content:
#ifndef GOODTABLE_H
#define GOODTABLE_H
#include <QDialog>
#include <QSqlTableModel>
namespace Ui {
class GoodTable;
}
class GoodTable : public QDialog
{
Q_OBJECT
public:
explicit GoodTable(QDialog *parent = 0);
GoodTable(QDialog *parent,QSqlTableModel* model);
~GoodTable();
private:
Ui::GoodTable *ui;
};
#endif // GOODTABLE_H
#include "goodtable.h"
#include "ui_goodtable.h"
GoodTable::GoodTable(QDialog *parent) :
QDialog(parent),
ui(new Ui::GoodTable)
{
ui->setupUi(this);
}
GoodTable::GoodTable(QDialog *parent,QSqlTableModel* model) :
QDialog(parent),
ui(new Ui::GoodTable)
{
ui->setupUi(this);
ui->tableView->setModel(model);
}
GoodTable::~GoodTable()
{
delete ui;
}
The code creating second window:
void MainWindow::on_goodTable_clicked()
{
QSqlTableModel model;
initializeGoodModel(&model);
//! [4]
GoodTable view(NULL,&model);
view.setWindowFlags(Qt::Window);
view.setWindowModality(Qt::ApplicationModal);
view.show();
}
The problem is, that you have a local dialog object on the stack in your on_goodTable_clicked method. So you create the view, call show, which shows the dialog and immediately returns, then your view get's destroyed as you leave the function. If you make the dialog modal anyway, why not use QDialog's exec method intead of show. It shows the dialog and blocks the main window until you clicked the dialog's Ok or cancel button and then exec finally returns. When you want a non-modal dialog (meaning your main window works, while the dialog is open), you need to create your dialog dynamically (or make it a member of your main window, or both).