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Freely refactor your code until testing each module is not just possible, but downright convenient! When a module is difficult to test, that is an excellent signal that the module has too many hard-coded entanglements with other parts of the code, and that it will be difficult to predict how the system as a whole will behave The ease with which code can be tested, in other words, is often directly related to how easy it is to draw a boundary around which other parts of the system the code can directly affect..

Listing 7-4. The RSSItem Object XML Definition <objects> <object name="RSSItem"> <field name="title" type="title" isArray="false"/> <field name="link" type="url" isArray="false"/> <field name="description" type="description" isArray="false"/> <field name="source" type="string" isArray="false"/>

Try picking one item at a time in any one of the views and study where the selection is shown in the other views. Notice that the list shows only the first column, and the child items only affect the tree view. Try picking items with the Ctrl or Shift keys pressed (and then try it with both). Try picking a row from each view. When you select a row in the list, only the first column is selected. Try picking columns in the table (click the header) and see what happens in the other views. Make sure to pick the second column and watch the list view. Double-click any item and alter the text. QStandardItem objects are by default editable. Don t forget to experiment with the spacer bars.

Second, write as little code as possible Rely on well-written and thoroughly tested third-party code whenever you can, with a special emphasis on using tools that seem to be well tested and actively maintained One reason for using common technologies over obscure tools that you think might be better is that the code with the larger community is more likely to have its weaknesses and vulnerabilities discovered and resolved Keep everything upgraded and up-to-date when possible, from the operating system and your Python install to the particular distributions you are using off of PyPI And, of course, isolate your projects from each other by giving each of them its own virtual environment using the virtualenv command discussed in 1.

The views and the standard model are flexible. You might not like some details in the application, so let s start looking at these details. You can start by setting some descriptive text in the headers: insert QStandardItems into the model by using setHorizontalHeaderItem(int, QStandardItem*) and setVerticalHeaderItem(int, QStandardItem*). Listing 5-5 shows the lines added to the main function to add horizontal headers. Listing 5-5. Adding headers to the standard item model model.setHorizontalHeaderItem( 0, new QStandardItem( "Name" ) ); model.setHorizontalHeaderItem( 1, new QStandardItem( "Phone number" ) );

Third, the fact that you are reading this book indicates that you have probably already adopted one of my most important recommendations: to use a high-level language like Python for application development Whole classes of security problems disappear when your code can talk directly about dictionaries, Unicode strings, and iteration over complex data structures, instead of having to manipulate raw integers every time it wants to visit every item in a list Repetition and verbosity not only waste your time and cut your productivity, but also directly increase your chance of making a mistake Fourth, as you strive for elegant and simple solutions, try to learn as much as possible about the problem domain if many people have tackled it before you.

Then there is the issue of the items being editable by the user. The editable property is controlled at the item level. By using the setEditable(bool) method on each child item shown in the tree view, you make them read-only (see the inner loop for it in Listing 5-6). Listing 5-6. Creating read-only items in a standard item model if( c == 0 ) for( int i=0; i<3; i++ ) { QStandardItem *child = new QStandardItem( QString("Item %1").arg(i) ); child->setEditable( false ); item->appendRow( child ); }

<field name="sourceLink" type="url" isArray="false"/> <field name="author" type="name" isArray="false"/> <field name="tags" type="string" isArray="false"/> <field name="comments" type="string" isArray="false"/> <field name="commentRss" type="string" isArray="false"/> <field name="publishedDate" type="date" isArray="false"/> <field name="mediaLink" type="url" isArray="false"/> <field name="mediaType" type="string" isArray="false"/> <field name="latitude" type="latitude" isArray="false"/> <field name="longtitude" type="longitude" isArray="false"/> </object> <object name="RSSFeed"> <field name="title" type="title" isArray="false"/> <field name="url" type="feedUrl" isArray="false"/> <field name="link" type="url" isArray="false"/> <field name="description" type="description" isArray="false"/> <field name="imageURL" type="imageUrl" isArray="false"/> </object> </objects>

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