Vaadin (Java Framework) - Various Random Trivia

Front 1

What is the AcceptCriterion class used for?

Back 1

Drag/drop client-side validation.

Front 2

What kinds of AcceptCriterion are there? List what you can.

Back 2

AbstractSelect.AcceptItem,
AbstractSelect.TargetItemIs,
AbstractSelect.VerticalLocationIs,
AcceptAll,
And,
ClientSideCriterion,
ContainsDataFlavor,
Not,
Or,
ServerSideCriterion,
SourceIs,
SourceIsTarget,
Table.TableDropCriterion,
TargetDetailIs,
Tree.TargetInSubtree,
Tree.TargetItemAllowsChildren,
Tree.TreeDropCriterion

Front 3

(bug/workaround) How do you deal with disappearing components in a tree table?

Back 3

Set each component to setImmediate(true)

Front 4

Make a window modal

Back 4

w.setModal(true);

Front 5

Show a new window

Back 5

this.getWindow().addWindow(w);

Front 6

4 functions for getting vaadin tree table items as a *collection*?

Back 6

rootItemIds() - gets root items
getItemIds() - only gets visible items
getChildren(itemId) - gets children of an item

Front 7

List the types of layouts in vaadin, and their uses.

Back 7

HorizontalLayout
VerticalLayout
GridLayout
AbsoluteLayout
??? others not listed.

Front 8

How do you make a component expand to fit remaining space?

Back 8

parent.setExpandRatio(...)
parent.setVerticalExpandRatio(...)

Front 9

How do you find out if vaadin tree items can have sub-items?

Back 9

tree.areChildrenAllowed(itemId)

Front 10

How do you avoid having components disappear from a tree table when parent items are expanded and unexpanded?
?

Back 10

?

Front 11

How do you expand a tree item in a tree table?

Back 11

parent.setCollapsed(itemId, false)

Front 12

How do you know if a tree item is expanded?

Back 12

parentTable.isCollapsed(itemId)

Front 13

how do you change which column shows the expand buttons on a tree table?

Back 13

setHierarchyColumn(columnId)

Front 14

Is it possible to listen for opening/closing of tree items? Explain.

Back 14

Yes. Add a Tree.ExpandListener object.

Front 15

Ways to get vaadin tree table items

Back 15

getIdByIndex(int)
getParent
lastItemId()
nextItemId()
...

Front 16

http://lifehacker.com/5973887/the-janki-method-shortens-the-time-itll-take-you-to-learn-to-code

Back 16

Every time you learn something new create a question and answer flashcard and add this card to Anki.
You must use Anki every single day- including weekends and holidays – and commit to doing so indefinitely.
Learn in context. Pick a project, and learn only what you need to get it done.
Only add a card to your deck after having tried to use the item of knowledge therein.
Every time you make a mistake carry out a post-mortem and try to figure out the lessons in the experience. Think about what you would need to know to prevent that mistake from occurring again, and turn this insight into new flashcards.
At the end of every project ask yourself what lessons you learned and what you would do differently if you were to repeat the project with the benefit of hindsight.
Delete or modify any incorrect, outdated, difficult to remember, incomplete or unnecessary cards. Update existing cards as improved understanding dawns.
Read code regularly. If you come across something interesting – be that an algorithm, a hack, or an architectural decision – create a card detailing the technique and showing the code.

Front 17

Deal with disappearing components in tree

Back 17

Set all components to setImmediate(true)

Front 18

Accept Criterion for vaadin drag/drop: list as many as you can.

Back 18

AbstractSelect.AcceptItem,
AbstractSelect.TargetItemIs,
AbstractSelect.VerticalLocationIs,
AcceptAll,
And,
ClientSideCriterion,
ContainsDataFlavor,
Not,
Or,
ServerSideCriterion,
SourceIs,
SourceIsTarget,
Table.TableDropCriterion,
TargetDetailIs,
Tree.TargetInSubtree,
Tree.TargetItemAllowsChildren,
Tree.TreeDropCriterion