Develop Reference

How to navigate through Vaadin grid and select an item using keyboard?

I'd like to know if it's possible to navigate through Vaadin grid or treegrid and select an item using only keyboard arrow keys? From what i've seen while testing the components, the default behavior seems to be either to move only to one specific cell in grid or to a specific row in treegrid. Selection can be achieved if the user presses spacebar.
I've tried to add a shortcutListener to grid but it doesn't seem to work with arrow keys. And the grid scrollbar doesn't move with the selected item.
grid.addShortcutListener(new ShortcutListener("Down", KeyCode.ARROW_DOWN, null) {
#Override
public void handleAction(Object sender, Object target) {
//..//
selectedItem = dataSource.get(currentSelectedItemIndex);
grid.select(selectedItem);
grid.scrollTo(currentSelectedItemIndex); // this doesn't seem to do anything??
//..//
}
});
I guess my problem is that i don't know how to acquire event that moves selection to other cell/row.
Here's an image to represent the problem which i'm facing. The item that has only blue border was selected using arrow keys. I'd like to select an item automatically when user presses arrow keys (Down or Up) without the spacebar.
Image taken from here: https://demo.vaadin.com/sampler/#ui/grids-and-trees/grid/features
Edit1:
I'm using latest version of Vaadin - 8.1.6.
Edit2:
I tried to add couple of listeners to see if i could at least register the movement to the next/previous cell by using arrow up/down but without any luck.
Here's a list of listeners i've tried:
addSelectionListener - only registers selection after spacebar press
or mouse click. Not quite what i'm looking for.
addItemClickListener - only registers selection from mouse click.
addShortcutListener - registers pressed key but it doesn't work with arrows.
Is there any listener that could potentially help me with this issue?

The Grid component has basic keyboard navigation. If you need advanced options, like you have mentioned, for keyboard navigation, I would warmly recommend to test this add-on:
https://vaadin.com/directory/component/gridfastnavigation-add-on

Move user mouse to a certain point

I would like to know how can I create a mouse move after pressing a button?
I am a fish in coding starting with a simple project and would love to create a step by step clicking process where the mouse will be scrolling and pointing in a certain point, img, or maybe to a class of my project?

Currently, there is no way to force a mouse movement via Javascript mainly due to its security implications.
In your case, you can use focus to guide the user to the specific portion of the page that you want.

You cannot move the mouse in JavaScript for the moment. What you can do however is scrolling the page so that a elements goes under the mouse cursor.
My idea is to move the element you want with JavaScript under the mouse cursor. When the user clicks your button, you can, in the event handler capture the mouse coordinates and use those to place any element exactly under the mouse cursor.
The result of the mouse cursor is above this element can be achieved that way.

try to Create COM, then client will ask to accept some installation.
see here ; http://febru.soluvas.com/2015/02/javascript-move-mouse.html

How to distinguish between mouseDragged and mousePressed?

I want my program to behave diffrently when the user presses a component, and when a user drags the mouse over a component, the problem is that on mouse click both of these methods are being called (and it seems like mouseDragged is called after mousePressed), so how will i know if the user dragged his mouse or just pressed it?

The correct answer is to use mouseClicked instead of combination of mousePressed+mouseReleased in case you want to distinguish between a click and a drag.

Disable JButtons to read events from the keyboard

I have two JPanels. In the first one I have 3 JButtons and the second one is to draw images based on events read from the keyboard. If I set the JButtons with setEnabled(false); I can use the keyboard events as I expect (If I press up arrow the image moves up), but when the buttons are enabled nothing happens with the image. Even, if I press the space bar it behaves like if I clicked the button.

The problem is not with the JButtons, but is likely because your using a KeyListener. Don't use KeyListeners with Swing GUI's if you can avoid it and instead use Key Bindings. KeyListeners only work if the component being listened to has the focus, and when you have JButtons present, they will take the focus and prevent your KeyListener from working. Key Bindings, if done right, can avoid this problem.
For example, please see my code example here.

SWT: addFilter or addKeyListener on Composite

i want to have some composite-wide keyboard-shortcuts. The composites in question are in a tab-folder. I have a little function, which traverses all children of my composite and adds a KeyboardAdapter to every one of them.
The problem I have is that, when I open on of the tabs pressed keys aren't registered. I first have set the focus on some selectable widget in the tab, then it works. When i switch to another tab and then back, the focus is still kind of there (a grey selection instead of a blue one in a table for example), but it, again, doesn't work, until i click somewhere.
How can I do this? I thought about adding a filter to my display, but i only want events in a certain composite (and everything in there).
Thank you

Key events are delivered to the component that has keyboard focus. Composites do not get the keyboard focus, it is usually one of their child components that gets it and then they start receiving the key events (in case they are not used by children). Having the key listener on the parent Shell may possibly work.