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One of the most common ways to add some additional guidance to the user is to provide tooltips, which are little signs containing information (see Figure 9-1). They appear when you hover the mouse pointer over a control for a short period of time.

There seem to be two major differences of opinion among the designers and users of the various template languages about what constitutes the best way to use templates: Should templates be valid HTML with iteration and expressions hidden in element attributes Or should the template language use its own style of markup that festoons and wraps the literal HTML of the web page, as in Listing 11 3 While the former can let the developer run HTML validation against template files before they are ever rendered and be assured that rendering will not change the validator's verdict, most developers seem to find the latter approach much easier to read and maintain. Should templates allow arbitrary Python expressions in template code, or lock down the available options to primitive operations like dictionary get-item and object get-attribute Many popular frameworks choose the latter option, requiring even lazy programmers to push complex operations into their Python code where it belongs. But several template languages reason that, if Python programmers do so well without type checking, then maybe they should also be trusted with the choice of which expressions belong in the view and which in the template.

All widgets can be assigned a tooltip using the setTooltip(const QString&) method, which accepts a string that can either be plain text or formatted using HTML. To demonstrate tooltips, I have put together a QDialog class with a number of widgets. Listing 9-1 presents the constructor used to set up the widgets and layouts (refer to Figure 9-1 to see the result). Listing 9-1. The dialog constructor ToolTipDialog::ToolTipDialog() : QDialog() { QGroupBox *groupBox = new QGroupBox( tr("Group") ); QGridLayout *gbLayout = new QGridLayout( groupBox ); QCheckBox *checkBox = new QCheckBox( tr("Check!") ); QLabel *label = new QLabel( tr("label") ); QPushButton *pushButton = new QPushButton( tr("Push me!") ); gbLayout->addWidget( checkBox, 0, 0 ); gbLayout->addWidget( label, 0, 1 ); gbLayout->addWidget( pushButton, 1, 0, 1, 2 ); QGridLayout *dlgLayout = new QGridLayout( this ); dlgLayout->addWidget( groupBox, 0, 0 ); ... } In Listing 9-2 the tooltips for the checkbox and group box are set. The checkbox gets a single line, while the group box text is divided into three lines using the standard line break \n. The group box tooltip shows when you hover the mouse pointer around and between the widgets contained in the group box. If you hover over the label, checkbox, or push button, their respective tooltips are shown. Listing 9-2. Setting simple tooltip texts checkBox->setToolTip( tr("This is a simple tool tip for the check box.") ); groupBox->setToolTip( tr("This is a group box tool tip.\n" "Notice that it appears between " "and around the contained widgets.\n" "It is also spanning several lines.") );

Since many Python frameworks let you plug in your template language of choice, and only a few of them lock you down to one option, you might find that you can pair your favorite approaches. As always, look for a community with a consistent practice, try to understand the reasons for the community's choice of template language, and join that community if you think its approach holds water.

Breaking a string over multiple lines does not affect the result. From the C++ compiler s viewpoint, Tip the string "foo" line break "bar" is identical to the string "foobar". Sometimes it is handy to be able to break down a line because it can be used to increase the readability or simply to fit the code onto the paper when printing it.

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