Allow Many QWidgets to be Shown into One QWidget ?

[Fatla]

That's Wonderful .
1/2 of my problem 's been solved .

I've just noticed that when I drag & drop QStackedWidget using QT Design , Pages (instance of Widgets ) are created & added to the stacked widget .
I can add any number of pages I want & add the controls into it . I can control which widget to be displayed .
It works so great .

The second half of my problem :
- Whenever I try to declare instace of my .UI & add it to the QStackedWidget , Exception is appeared .
I've tried :
addWidget(WidgetObj);
widget(index );
insertWidget (index , WidgetObj);

CustomSlot's code that implements slots of the .UI & also has the QStackedWidget :

#include"CustomSlot2.h"
#include "ui_Form2.h" 
#include "CustomSlot.h"
 
 
 
CustomSlot2::CustomSlot2(QWidget *parent): QWidget(parent)
{
	formTwo.setupUi(this);
 
        //CustomSlot is the class that implement the slots of the .UI that I want to add at QStackedWidget
	CustomSlot *CustomSlotObj  ;
	//formTwo.stackedWidget->addWidget(CustomSlotObj);
 
      // I've already just 2 pages at QStackedWidget , The third on is going to be in index 2 
	formTwo.stackedWidget->insertWidget(2,CustomSlotObj);
 
        QWidget *WidgetObj;
	WidgetObj= formTwo.stackedWidget->widget (2) ;
 
 
      WidgetObj->show();
 
 
}

#include"CustomSlot2.h"
#include "ui_Form2.h" 
#include "CustomSlot.h"



CustomSlot2::CustomSlot2(QWidget *parent): QWidget(parent)
{
	formTwo.setupUi(this);
        
        //CustomSlot is the class that implement the slots of the .UI that I want to add at QStackedWidget
	CustomSlot *CustomSlotObj  ;
	//formTwo.stackedWidget->addWidget(CustomSlotObj);

      // I've already just 2 pages at QStackedWidget , The third on is going to be in index 2 
	formTwo.stackedWidget->insertWidget(2,CustomSlotObj);

        QWidget *WidgetObj;
	WidgetObj= formTwo.stackedWidget->widget (2) ;


      WidgetObj->show();


}

To copy to clipboard, switch view to plain text mode 

Thanks .

[jpn]

"CustomSlot *CustomSlotObj;" produces nothing but a dangling pointer which points to some random memory garbage. You forgot to actually instantiate something with C++ operator new.

[Fatla]

Perfect , it works now .
However I still have simple issues :

1- When I add my .UI at the QStacked Widget , it successfully appears & I can just control it using Keyboard (i.e. the UI that I've added at QStacked Widget contains QLineEdit + Button I can't press the button using the mouse I should use my "Tab" in order to go to that control then press "Space" ) ?!!

2- According to what I've have understood that only one widget at QStackedWidget can be displayed at once to the user .
I just have one QWidget that is put by default at QStackedWidget , when I drag & drop the stack using QT Design . Then at this page I've added a button . Then using the code I 've added my .UI at the stack then show it .
What 's weird : that both QWidgets that have the button + the other Widget that I 've add by code are displayed ?

Thanks .

[jpn]

Sounds like you created the form as a child of the stacked widget but you didn't actually add the widget to the stack widget. That's at least one reason why it wouldn't be managed by the stacked widget.

[Fatla]

How is that ?!!

Part of Header files 's code generated to the form that contains the QStackedWidget :

#include <QtGui/QStackedWidget>
#include <QtGui/QWidget>
 
 
class Ui_FormTwo
{
public:
    QStackedWidget *stackedWidget;
    QWidget *page;
 
    void setupUi(QWidget *FormTwo)
    {
    stackedWidget = new QStackedWidget(FormTwo);
    stackedWidget->setObjectName(QString::fromUtf8("stackedWidget"));
    stackedWidget->setGeometry(QRect(460, 130, 551, 371));
    page = new QWidget();
    page->setObjectName(QString::fromUtf8("page"));
    page->setGeometry(QRect(0, 0, 551, 371));
    stackedWidget->addWidget(page);
 
    retranslateUi(FormTwo);
 
    stackedWidget->setCurrentIndex(0);
 
 // ......................etc
 
    } // setupUi

#include <QtGui/QStackedWidget>
#include <QtGui/QWidget>


class Ui_FormTwo
{
public:
    QStackedWidget *stackedWidget;
    QWidget *page;

    void setupUi(QWidget *FormTwo)
    {
    stackedWidget = new QStackedWidget(FormTwo);
    stackedWidget->setObjectName(QString::fromUtf8("stackedWidget"));
    stackedWidget->setGeometry(QRect(460, 130, 551, 371));
    page = new QWidget();
    page->setObjectName(QString::fromUtf8("page"));
    page->setGeometry(QRect(0, 0, 551, 371));
    stackedWidget->addWidget(page);

    retranslateUi(FormTwo);
    
    stackedWidget->setCurrentIndex(0);

 // ......................etc
    
    } // setupUi

To copy to clipboard, switch view to plain text mode 

---------------------------------------------------------------
Temporarily , I've added the code that add my .UI to the stack at the constructor of the form that has the stack object :

CustomSlot2::CustomSlot2(QWidget *parent): QWidget(parent)
{
	formTwo.setupUi(this);
 
	CustomSlot *CustomSlotObj=new CustomSlot()  ;
 
	formTwo.stackedWidget->insertWidget(1,CustomSlotObj);
 
        QWidget *WidgetObj;
	WidgetObj= formTwo.stackedWidget->widget (1) ;
 
        WidgetObj->show();
 
 
}

CustomSlot2::CustomSlot2(QWidget *parent): QWidget(parent)
{
	formTwo.setupUi(this);

	CustomSlot *CustomSlotObj=new CustomSlot()  ;

	formTwo.stackedWidget->insertWidget(1,CustomSlotObj);

        QWidget *WidgetObj;
	WidgetObj= formTwo.stackedWidget->widget (1) ;

        WidgetObj->show();


}

To copy to clipboard, switch view to plain text mode 

Thanks .

[jpn]

Aha, now I realized what's wrong.

QWidget *WidgetObj;
WidgetObj= formTwo.stackedWidget->widget (1) ;
 
WidgetObj->show();

QWidget *WidgetObj;
WidgetObj= formTwo.stackedWidget->widget (1) ;

WidgetObj->show();

To copy to clipboard, switch view to plain text mode 

This is not the way you use QStackedWidget. You are supposed to use QStackedWidget::setCurrentIndex() or setCurrentWidget().

[Fatla]

Thanks , it works successfully .
I 've one more question :

- I've added many QWidgets into stack . Now I need when the turn comes to a particular widget to be shown , I can access its variables .

#include "Container.h"
 
 
 
Container::Container(QWidget *parent): QWidget(parent)
 {
    ContainerUi.setupUi(this);
 
	PageIndex=1;
 
 
	CustomSlot1 *CustomSlot1Obj =new CustomSlot1();
	CustomSlot2 *CustomSlot2Obj=new CustomSlot12();
	CustomSlot3 *CustomSlot3Obj=new CustomSlot3();
//........................ to CustomSlot9
 
 
    // Push objects into the QStackedWidget
	ContainerUi.StackedWidget->addWidget(CustomSlot1);
	ContainerUi.StackedWidget->addWidget(CustomSlot2);
	ContainerUi.StackedWidget->addWidget(CustomSlot3);
//.................. pust the other Widgets into the Stack
 
 
	ContainerUi.StackedWidget->setCurrentIndex(PageIndex);
	PageIndex++;
 
}
 
void Container :: NextPage()
{
 
 
 
	int CurrentIndex=ContainerUi.StackedWidget->currentIndex ();
	if(PageIndex <10)
	{
 
		if(CurrentIndex==3 )
		{
		CustomSLot3 *widget ;
		widget=ContainerUi.StackedWidget->widget  (3);
                                  // GrainSizeFlag is a public variable at CustomSlot3
				if(widget->GrainSizeFlag==true)
				::PageIndex=7;
 
 
 
		}
		ContainerUi.StackedWidget->setCurrentIndex(PageIndex);
		PageIndex++;
 
	}
 
 
}

#include "Container.h"



Container::Container(QWidget *parent): QWidget(parent)
 {
    ContainerUi.setupUi(this);

	PageIndex=1;
    
	
	CustomSlot1 *CustomSlot1Obj =new CustomSlot1();
	CustomSlot2 *CustomSlot2Obj=new CustomSlot12();
	CustomSlot3 *CustomSlot3Obj=new CustomSlot3();
//........................ to CustomSlot9


    // Push objects into the QStackedWidget
	ContainerUi.StackedWidget->addWidget(CustomSlot1);
	ContainerUi.StackedWidget->addWidget(CustomSlot2);
	ContainerUi.StackedWidget->addWidget(CustomSlot3);
//.................. pust the other Widgets into the Stack


	ContainerUi.StackedWidget->setCurrentIndex(PageIndex);
	PageIndex++;

}

void Container :: NextPage()
{
	


	int CurrentIndex=ContainerUi.StackedWidget->currentIndex ();
	if(PageIndex <10)
	{
		
		if(CurrentIndex==3 )
		{
		CustomSLot3 *widget ;
		widget=ContainerUi.StackedWidget->widget  (3);
                                  // GrainSizeFlag is a public variable at CustomSlot3
				if(widget->GrainSizeFlag==true)
				::PageIndex=7;
			
			
			
		}
		ContainerUi.StackedWidget->setCurrentIndex(PageIndex);
		PageIndex++;

	}


}

To copy to clipboard, switch view to plain text mode 

By default the Stack contains one widget . So my "CustomSlot" 'll go to the index [1].
As a result of that , CustomSlot3 'll go to index [3].

I've an error that tells ms : Invalid Conversion QWidget* to CustomSlot3*

Thanks .

[wysota]

I suggest you keep all pointers as member variables of the containing class and access them directly instead of fetching the pointer through current widget of the stack (it is possible of course - you'd have to cast the pointer received to a proper type).

[Fatla]

It has been a long time since my last reply .
Things were going so fine & the resources over web were extremely helpful .

Currently , I was looking for property/function that DeActivate child widget
(e.g. If I've a Widget that has a QPushButton . When the user press that button another widget 'll be shown & TOTALLY DeActivate the previouse widget .
So the user won't be able even to close / maximize/minimize the old widget )

I've tried :
isActiveWindow():Just make the widget on top .
setEnabledisable all the controls into widget but not the toolbar (i.e. the user will be able to close / maximize/minimize widget)

Thanks .

[Fatla]

I've found a solution to the problem :

this->setEnabled(false);
 
   HMENU menu = ::GetSystemMenu(this->winId(), FALSE);
 
   ::DeleteMenu(menu, SC_CLOSE, MF_BYCOMMAND);
 
   ::EnableMenuItem(menu, SC_CLOSE, MF_BYCOMMAND | MF_GRAYED);

this->setEnabled(false);

   HMENU menu = ::GetSystemMenu(this->winId(), FALSE);

   ::DeleteMenu(menu, SC_CLOSE, MF_BYCOMMAND);

   ::EnableMenuItem(menu, SC_CLOSE, MF_BYCOMMAND | MF_GRAYED);

To copy to clipboard, switch view to plain text mode 

That of course after including : #include <qt_windows.h>

[Fatla]

I've solved the 2nd issue by :

void MainWindow::EnableToolBar()
 {
	 MainWindowMenu = ::GetSystemMenu(this->winId(), TRUE);
 
 }

void MainWindow::EnableToolBar()
 {
	 MainWindowMenu = ::GetSystemMenu(this->winId(), TRUE);

 }

To copy to clipboard, switch view to plain text mode 

[wysota]

Why would you want to disable maximizing/minimizing a window? Don't you think it is an extreme interference in the user's desktop? As for closing, you don't need any windows related functions, simply reimplement closeEvent() for your widget and ignore the event if you want to prevent the window from being closed. You can disable the maximize/minimize buttons if you really want to, by either hiding them using window flags or by removing the window from the window manager's control (by using window flags again). To disable the contents of a window simply disable() it (or setEnabled(false)).