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Listing 3-9 shows an example of how a dialog with list widgets is set up. First, a layout is created along with the widgets two list widgets and two buttons for moving items between the lists. After that, the buttons are connected to slots in the dialog class that perform the actual moving of the items before the list is populated. Figure 3-16 shows the dialog with the lists being used. Listing 3-9. Creating and populating the list widgets ListWidgetDialog::ListWidgetDialog() : QDialog() { QPushButton *left, *right; QGridLayout *layout = new QGridLayout( this ); layout->addWidget( left = new QPushButton( "<<" ), 0, 1 ); layout->addWidget( right = new QPushButton( ">>" ), 1, 1 ); layout->addWidget( leftList = new QListWidget, 0, 0, 3, 1 ); layout->addWidget( rightList = new QListWidget, 0, 2, 3, 1 ); connect( left, SIGNAL(clicked()), this, SLOT(moveLeft()) ); connect( right, SIGNAL(clicked()), this, SLOT(moveRight()) ); QStringList items; items << "Argentine" << "Brazilian" << "South African" << "USA West" << "Monaco" << "Belgian" << "Spanish" << "Swedish" << "French" << "British" << "German" << "Austrian" << "Dutch" << "Italian" << "USA East" << "Canadian"; leftList->addItems( items ); }

Attaches the class specified in className to the CheckBox. It must be a valid, defined CSS class available to the host page. Passes focus to the CheckBox. If the CheckBox is off the page, scrolls the page until it is in view. Unattaches the CSS class specified in className. If the CSS className is currently attached, unattaches it; otherwise, attaches it.

Figure 3-10. Last two IfElse activities in workflow Notice that the last IfElse activity (FutureExpectedDate) has a Code activity within both branches. When this activity is encountered, that means all previous activities have executed the left branch of the IfElse activities (they have all been True), and if the order quantity is greater than zero, then the purchase order can be added. Otherwise, the purchase order can t be added because the order quantity is less than zero.

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Figure 3-16. The list widget dialog in action Listing 3-10 shows how the items are moved between two list widgets. The code shows the slot for moving items from the left list to the right list. First, use the selectedItems().count() method to determine whether there actually is anything to move. The takeItem(int) method

is used to remove an item from one list widget without having to delete it. This method tells the list widget that you take responsibility for managing the item and removes it from the list widget. You can then add the item to the other list widget using the addItem(QListWidgetItem*) method. This approach enables you to move the items between the list widgets without deleting or creating anything. Listing 3-10. Slot for moving items from the right to the left void ListWidgetDialog::moveLeft() { if( rightList->selectedItems().count() != 1 ) return; QListWidgetItem *item = rightList->takeItem( rightList->currentRow() ); leftList->addItem( item ); }

focus() scrollIntoView() removeCSSClass(String className) toggleCSSClass(String className)

A combo box can be used like a list widget when only the current item is shown. An alternate use is to provide the users with a list of items, but also enable them to write their own texts. You control whether the user can type in custom text by using the editable property. When the user picks an item from the list, the activated(int) and activated(const QString&) signals are emitted.

This chapter covered the various ways to branch within a workflow, and how to handle decisions. This chapter covered the IfElse activity for handling decisions, and the While activity to show how you can use conditions to execute activities until a condition is met. The next chapter will cover activities that facilitate flow within the workflow.

When you need to iterate in a specialized way or just want to access a specific item, you can always use indexed access with the [] operator or the at method. For a QList, this process is very quick. For example, the following line calculates the sum of the sixth and eighth element of a list: int sum = list[5] + list.at(7);

The CheckBox control has the properties described in Table 4-23.

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