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Listing 3-7. Labels and line edits as buddies QDialog dlg; QLabel *fooLabel = QLabel *barLabel = QLineEdit *fooEdit QLineEdit *barEdit new QLabel( "&Foo:" ); new QLabel( "&Bar:" ); = new QLineEdit; = new QLineEdit;

bindings dataContext id accessKey associatedElement behaviors cssClass enabled style tabIndex visible visibilityMode text navigateURL

fooLabel->setBuddy( fooEdit ); barLabel->setBuddy( barEdit ); QGridLayout *layout = new QGridLayout( &dlg ); layout->addWidget( fooLabel, 0, 0 ); layout->addWidget( fooEdit, 0, 1 ); layout->addWidget( barLabel, 1, 0 ); layout->addWidget( barEdit, 1, 1 );

Result = Not IsDate(DtePurchaseDate) End Sub Public Sub ExpectedDatePresentCondition(ByVal sender As Object, ByVal e As ConditionalEventArgs) eResult = IsDate(DteExpectedDate) End Sub Public Sub ExpectedDateMissingCondition(ByVal sender As Object, ByVal e As ConditionalEventArgs) eResult = Not IsDate(DteExpectedDate) End Sub.

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The line edit is used to enable the user to edit a single line of text. (For multiline texts, use the QTextEdit widget.) The most common use is for the user to enter text, but you can also use it for passwords. Just set the echoMode property to Password, and the entered text shows up as asterisks. You can set the text of the line edit using setText(const QString&), and you get it with text(). Whenever the text is changed, you can connect to the textChanged(const QString&) signal. If you want to make sure that the user does not enter an entire essay into the field, you can limit the length of the text using the maxLength property. To try out the line edit widget, you can test it in Designer. First create a dialog with six line edits and four labels, as shown in Figure 3-12. The figure shows the connections in which the textChanged signal of each line edit in the left column is connected to the setText slot of the corresponding widget in the right column. The label for each row then tells you what property was changed for each line edit in the left column.

Returns an array of strings indicating the data bindings for this control. Gets the data context for the binding associated with the control. Returns the ID for the control. Allows the access key for quick access to this control to be set or read. Returns an object reference to the associated element. Returns an array of strings indicating the behaviors associated with this control. Gets or sets the cssClass for this control. You can also use the various CSS methods of the control to manipulate its CSS class. Gets or sets whether the control is enabled. When true, the control is enabled; when false, the control is grayed out. Returns an object containing the element s style settings. Gets or sets the value of the control in the tab index. Gets or sets the visibility of the control. If true, the control is visible; if false, it is invisible. Returns a string containing the CSS definition for the object s visibility. The text associated with this anchor. This is the text that will appear on the web page. In the previous example, the text property will be HyperLink. The location of the destination for this link. This is the text that appears within the href attribute on the HTML tag.

If you want to get to know a widget, try playing with its properties and do a preview (Ctrl+R) to see Tip

Figure 3-12. The line edit widget demonstration dialog with its connections Figure 3-13 shows how the dialog looks in preview mode. The password in the middle row is hidden, and the length of the bottom row is limited.

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