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Listing 9-1. TechnoratiBlock.js componentManager.add("t", "TechnoratiClass", "/content/components/icons/logo.png", "/content/components/icons/logo.png");

Another very useful tag is the img tag, which is used to insert images from files or resources into the text. Figure 9-3 shows an example tooltip. The tag s syntax looks like <img src='nnn'>, where nnn is the file name. If the file name starts with :, it refers to a resource embedded into the executable file. Listing 9-4 presents the source code for creating the example tooltip found in Figure 9-3.

Note that some quite successful web applications are produced by combining two or more frameworks that are loosely coupled through a common database For example, you might combine a Django application serving HTML pages with a restish application that provides RESTful CRUD operations that can be invoked from JavaScript Choosing the best tool for the job sometimes involves combining several tools, instead of demanding everything from a single monolithic application Finally, understand that experience is often the best guide to choosing a web framework This means that, after all of the window shopping, you are going to have to sit down and try actually writing in some of the various frameworks available before you really know whether a given framework will prove a good fit for either yourself or your problem.

Listing 9-4. A tooltip including an image pushButton->setToolTip( tr("<img src=':/images/qt.png'>" "You can also insert images into your tool tips.") ); It is easy to provide tooltips for all your widgets and thus give your users the support they need. A tooltip is often used to answer questions such as What does this button do and Where did that hide ruler button go When you design a tooltip, try to keep the text at a minimum because the tips are often used to quickly obtain an understanding of the various interface widgets.

We all like to think that we know ourselves well enough to predict such things without doing any actual coding For example, we may feel we know intuitively which web framework is really our style and will let us be productive However, trying a range of approaches may reveal that your initial guess about how your mind works did not actually do justice to what you can accomplish with an ostensibly ugly framework, once you understand its benefits Remember that, whatever framework you choose, you are writing Python code This means that your application's quality is going to depend at least as much upon your ability to write good, clean, Pythonic code as it will upon any magical features of the framework itself.

There are times when you ll want to assign several tooltips to a single widget usually when you re dealing with views for models and other widgets showing a complex document. In these situations a single widget is used to show several different items, in which each item might need a tooltip of its own. For example, suppose you have a drawing application in which you want to use tooltips to show the diameter of circles and the width and height of rectangles. Because the entire drawing is shown using a single viewing widget, that widget needs to provide different tooltips depending on where the mouse pointer is located. To do this it helps to understand how the tooltip is shown. The actual appearance of a tooltip is triggered through a ToolTip event. By intercepting the event in the event(QEvent*) method, you can change the tooltip depending on where the mouse pointer is located. Figure 9-4 shows the desired effect: the four squares are all part of one widget, but each square shows a different tooltip text.

The framework might even feel rather awkward to you, or it might be selected by a senior team member with whom you disagree; but always remember that this is Python, and that its flexibility and elegance will generally let you write a good web application, whatever framework you ultimately end up using..

function TechnoratiClass() { }

avoiding the need to intercept the ToolTip event for the view widget or the scene. When working with item views, you can use the model-view architecture to set tooltips for each item by assigning data to Qt::ToolTipRole. If you want to provide custom tooltips for the view, reimplement the viewportEvent(QEvent*) method instead of event().

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