Auto resize Widget to maximum avail. space

[pospiech]

First of all make sure the layout is setup properly. The form should have a layout set and inside that layout there should be your widget. The code you posted in the first post is a mess, so I didn't analyze it, but at a first glance it seems incorrect.

Blame Trolltech not me. That code is auto generated.
It is simply a qwidget with a Gridlayout within the qwtwidget is placed.

[Michiel]

Perhaps you'd better post the .ui file, which is easier for humans to analyze. :-)

[wysota]

Blame Trolltech not me. That code is auto generated.

It doesn't mean the form was correct. Could you attach the ui file?

[pospiech]

I have now created an independent example: (Sorry it does not use an .ui file)

main.cpp

#include <qt/qapplication.h>
#include "MainWindow.h"
 
int main(int argc, char** argv)
{
	QApplication app( argc, argv );
	MainWindow mainWindow;	
	mainWindow.show();
	return app.exec();
}

#include <qt/qapplication.h>
#include "MainWindow.h"

int main(int argc, char** argv)
{
	QApplication app( argc, argv );
	MainWindow mainWindow;	
	mainWindow.show();
	return app.exec();
}

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MainWindow.h

#ifndef MAINWINDOW_H_
#define MAINWINDOW_H_
 
#include <QtGui/QApplication>
#include <QtGui/QGridLayout>
#include <QtGui/QMainWindow>
#include <QtGui/QTextEdit>
#include <QtGui/QWidget>
 
class MainWindow : public QMainWindow
{
	Q_OBJECT
public:
    QWidget *m_centralwidget;
    QWidget *gridLayout;
    QGridLayout *gridLayout1;
    QTextEdit *textEdit;
 
    void setupUi(QMainWindow *MainWindow)
    {
		MainWindow->resize(500, 500);
		m_centralwidget = new QWidget(MainWindow);
 
		QSizePolicy sizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
		sizePolicy.setHorizontalStretch(0);
		sizePolicy.setVerticalStretch(0);
		m_centralwidget->setSizePolicy(sizePolicy);
 
		gridLayout = new QWidget(m_centralwidget);
		gridLayout->setGeometry(QRect(50, 50, 300, 200));
		gridLayout->setSizePolicy(sizePolicy);
 
		textEdit = new QTextEdit(gridLayout);
 
		gridLayout1 = new QGridLayout(gridLayout);
		gridLayout1->setContentsMargins(0, 0, 0, 0);
		gridLayout1->addWidget(textEdit, 0, 0, 1, 1);
 
		MainWindow->setCentralWidget(m_centralwidget);
 
		QMetaObject::connectSlotsByName(MainWindow);
    } // setupUi
 
public:
	MainWindow(QWidget* parent = 0, Qt::WFlags flags = 0);
 
	virtual ~MainWindow(){};
	//void resizeEvent(QResizeEvent * /* event */);
 
};
#endif

#ifndef MAINWINDOW_H_
#define MAINWINDOW_H_

#include <QtGui/QApplication>
#include <QtGui/QGridLayout>
#include <QtGui/QMainWindow>
#include <QtGui/QTextEdit>
#include <QtGui/QWidget>

class MainWindow : public QMainWindow
{
	Q_OBJECT
public:
    QWidget *m_centralwidget;
    QWidget *gridLayout;
    QGridLayout *gridLayout1;
    QTextEdit *textEdit;

    void setupUi(QMainWindow *MainWindow)
    {
		MainWindow->resize(500, 500);
		m_centralwidget = new QWidget(MainWindow);
		
		QSizePolicy sizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
		sizePolicy.setHorizontalStretch(0);
		sizePolicy.setVerticalStretch(0);
		m_centralwidget->setSizePolicy(sizePolicy);

		gridLayout = new QWidget(m_centralwidget);
		gridLayout->setGeometry(QRect(50, 50, 300, 200));
		gridLayout->setSizePolicy(sizePolicy);

		textEdit = new QTextEdit(gridLayout);

		gridLayout1 = new QGridLayout(gridLayout);
		gridLayout1->setContentsMargins(0, 0, 0, 0);
		gridLayout1->addWidget(textEdit, 0, 0, 1, 1);

		MainWindow->setCentralWidget(m_centralwidget);

		QMetaObject::connectSlotsByName(MainWindow);
    } // setupUi

public:
	MainWindow(QWidget* parent = 0, Qt::WFlags flags = 0);

	virtual ~MainWindow(){};
	//void resizeEvent(QResizeEvent * /* event */);

};
#endif

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MainWindow.cpp

#include "MainWindow.h"
//
MainWindow::MainWindow(QWidget* parent /*= 0*/, Qt::WFlags flags /*= 0*/) : QMainWindow(parent, flags)
{
	setupUi(this);
}
 
//void MainWindow::resizeEvent(QResizeEvent * /* event */)
//{
//	gridLayout->setGeometry(QRect(0, 0, this->width(), this->height()));
//}

#include "MainWindow.h"
//
MainWindow::MainWindow(QWidget* parent /*= 0*/, Qt::WFlags flags /*= 0*/) : QMainWindow(parent, flags)
{
	setupUi(this);
}

//void MainWindow::resizeEvent(QResizeEvent * /* event */)
//{
//	gridLayout->setGeometry(QRect(0, 0, this->width(), this->height()));
//}

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In this example nothing is resized if I resize the dialog.

Matthias

[wysota]

Why don't you post the UI file as requested? From what I see you are not applying a layout to the central widget, but I'd like to verify that using your UI file.

[pospiech]

Why don't you post the UI file as requested? From what I see you are not applying a layout to the central widget, but I'd like to verify that using your UI file.

Here the UI file from which I took the resulting code for my example


In my example I removed the statusbar and the menubar.

[wysota]

Yes, I was right - you didn't apply a layout to the central widget itself. Instead you had a floating layout, hence the mess in code you provided. Didn't Designer warn you about a floating layout?

Here is a corrected file.

[pospiech]

Yes, I was right - you didn't apply a layout to the central widget itself. Instead you had a floating layout, hence the mess in code you provided. Didn't Designer warn you about a floating layout?

What is a floating layout, and what exactly did I wrong? And no the designer never warned me. And I created the dialog as I created every dialog.

Here is a corrected file.

If I download and compare with my own one they have not changed. So I cannot see your corrections.

[wysota]

What is a floating layout, and what exactly did I wrong?

A floating layout is a layout without "parent" widget. Take your ui, open it, grab the layout with your mouse and try to move it. If it moves, it's floating.

And I created the dialog as I created every dialog.

If so, then you created every dialog incorrectly.

If I download and compare with my own one they have not changed. So I cannot see your corrections.

Hmm... sorry, must have forgotten to save the file. Try it again.

[pospiech]

A floating layout is a layout without "parent" widget. Take your ui, open it, grab the layout with your mouse and try to move it. If it moves, it's floating.

Well, yes I can move every layout I have ever seen.

So the question is how to have non floating layouts. What do I have to do in QtDesigner to do it correct?

[wysota]

Click on the form itself and then on one of the layout buttons, like I did in my ui file.