How to use KeyBindings in JFX 2? I need to reassign Enter key from carrige returning to my own function, and for carrige returning assign CTRL+ENTER
I've tried this way, but still it makes a new line.
messageArea.addEventFilter(KeyEvent.KEY_PRESSED, new EventHandler<KeyEvent>() {
#Override
public void handle(KeyEvent keyEvent) {
if (keyEvent.getCode() == KeyCode.ENTER) {
sendMessage();
}
}
});
As an addition to jewelsea's answer. To control key combinations use:
if (event.getCode().equals(KeyCode.ENTER) && event.isControlDown()) { // CTRL + ENTER
messageArea.setText(messageArea.getText() + "\n");
}
in your handler.
If want to prevent the default behavior of event you are filtering, you need to consume it.
There are numerous kinds of KeyEvents, you may want to filter on KeyEvent.ANY instead of just KeyEvent.KEY_PRESSED and consume them all.
Related
I'm trying to use text entry on maui to fire an event when completed. I have set the "Completed" event to a handler and it works correctly on windows. But on Android I have no joy, the event just isn't firing.
I realise there is a bug in Maui which is preventing this. But it looks like the problem was discovered in August? It's a fairly basic thing, well at least it appears to be on the face of things.
What is the best work around for this? The only thing I can think is by using the textchanged event instead of completed. This works correctly, but then i have to bodge it by doing this sort of thing:
if (entry1.Text.EndsWith("#"))
{
//Then string is complete, so need to fire correct event
System.Diagnostics.Debug.WriteLine("Complete String Detected");
}
This works and I can use it since I'm awaiting for input from a barcode scanner, so I can set the last terminating character to whatever I want. In this case I set it to a #. I can't figure out a way to detect the return key being pressed.
Thanks
Andrew
There is a similar issue on the github about the Entry.Completed and Entry.ReturnCommand not executed.
This comment shows the cause and the workaround about this problem.
detect the return key being pressed
In addition, I can't understand the problem. I have created a sample to test. The Entry.Completed event will call when I pressed the enter key. I don't kown the return key you mentioned is what. But you can use the IOnKeyListener for the android to detect any key being pressed.
Create a Listener class in the /Platform/Android:
public class MyKeyListener : Java.Lang.Object, IOnKeyListener
{
public bool OnKey(global::Android.Views.View v, [GeneratedEnum] Keycode keyCode, KeyEvent e)
{
var edittext = v as AppCompatEditText;
if (keyCode == Keycode.Enter && e.Action == KeyEventActions.Down )
//I used the Entry key as the example, you can use any other key you want to replace it.
{
edittext.ClearFocus();
edittext.SetBackgroundColor(Color.GreenYellow);
return true;
}
return false;
}
And in the page.xml:
<Entry Completed="Entry_Completed" x:Name="entry"/>
Set the listener to the entry by overriding the OnHandlerChanged() in the page.cs:
protected override void OnHandlerChanged()
{
base.OnHandlerChanged();
#if ANDROID
(entry.Handler.PlatformView as AndroidX.AppCompat.Widget.AppCompatEditText).SetOnKeyListener(new MauiAppTest.Platforms.Android.MyKeyListener());
#endif
}
You can also set the listener with the handler. Finally, you can try both the method above and the workaround in the issue on the github.
I am working on a Vala GTK application that starts minimized by default and I want to bind a specific keyword shortcut to bring the minimized window to the front.
I am able to handle Keyboard events using Accelerators when the app is focus ed, but I am unable to intercept any key press from the system when the app is minimized.
How can I make the app listen to system keyboard events so I can detect the key press accordingly?
Thank you.
I took a look at the source for Ideogram to see how it registers Super-e as a hot-key. It looks to be basically the following, including first checking that a custom hot-key has not already been registered for the application.
// These constants are set at class level.
public const string SHORTCUT = "<Super>e";
public const string ID = "com.github.cassidyjames.ideogram";
// Set shortcut within activate method.
CustomShortcutSettings.init ();
bool has_shortcut = false;
foreach (var shortcut in CustomShortcutSettings.list_custom_shortcuts ()) {
if (shortcut.command == ID) {
has_shortcut = true;
return;
}
}
if (!has_shortcut) {
var shortcut = CustomShortcutSettings.create_shortcut ();
if (shortcut != null) {
CustomShortcutSettings.edit_shortcut (shortcut, SHORTCUT);
CustomShortcutSettings.edit_command (shortcut, ID);
}
}
It uses a CustomShortcutSettings class included in its source to handle the reading and writing to the system settings. The class originated in another application called Clipped.
How do I clear the selection in my Eclipse RCP application?
Basically I would like to clear it on escape key down:
Display display = PlatformUI.createDisplay();
display.addFilter(SWT.KeyDown, new Listener() {
#Override
public void handleEvent(Event event) {
if (event.character == SWT.ESC) {
// if this is escape key, clear selection in the application
}
}
});
I thought I would be able to do something like PlatformUI.getWorkbench().getActiveWorkbenchWindow().getSelectionService().clearSelection()/setSelection(IStructuredSelection.EMPTY), but no go.
You need to look up the ISelectionProvider rather than the ISelectionService. That will provide you with a setSelection() method.
You can get the selction provider from the site:
PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().getActivePart().getSite().getSelectionProvider();
or
PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().getActiveEditor().getSite().getSelectionProvider();
Note that some of those return values could be null so add the appropriate checks.
You can't clear the selection provided by the selection service directly.
The selection the service returns is provided by a 'selection provider' (ISelectionProvider) for the current part.
You can get the selection provider from an IWorkbenchPart with IWorkbenchPart.getSite().getSelectionProvider().
ISelectionProvider has a setSelection method but it often does nothing or throws an exception so you may not be able to clear the selection.
I want handle events on a Label when user holds down some key (Ctrl) and then clicks the mouse button together (Ctrl + mouse click), like open some window etc...
How could i do that in GWT? Should i get add two handlers or can do it with one?
thank you.
al
In your click handler you can check if the Ctrl key is pressed when the event was fired, see example below. You also might want to check for the specific mouse button the user clicked on. I've also added that to the example:
yourLabel.addClickHandler(new ClickHandler() {
if(NativeEvent.BUTTON_LEFT == event.getNativeButton() &&
event.isControlKeyDown()) {
//do what you want
}
});
Or for older version of GWT instead of event.isControlKeyDown use event.getNativeEvent().getCtrlKey(), which returns a boolean value true if the control key is pressed when this event is fired.
Edit: this code is buggy, please look at Hilbrand's answer
To be honest, I don't think you can do it with 1 or 2 handlers. I think you would need 3 handler.
A KeyDownHandler that sets a boolean you can later read form the MouseDownHandler
A MouseDownHandler that does what you want
A KeyUpHandler that resets the value of the boolean in the KeyDownHandler
boolean ctrlPressed;
yourLabel.addDomHandler(new KeyDownHandler() {
public void onKeyDown(KeyDownEvent event) {
if(event.getAssociatedType().equals(KeyCodes.KEY_CTRL))
ctrlPressed=true;
}
}, KeyDownEvent.getType());
yourLabel.addDomHandler(new KeyUpHandler() {
public void onKeyUp(KeyUpEvent event) {
if(event.getAssociatedType().equals(KeyCodes.KEY_CTRL))
ctrlPressed=false;
}
}, KeyUpEvent.getType());
yourLabel.addClickHandler(new ClickHandler() {
if(ctrlPressed) {
//do what you want
}
});
I am using a TableViewer with a content provider, label provider, a ICellModifier and TextCellEditors for each column.
How can I add arrow key navigation and cell editing when the user selects the cell? I would like this to be as natural a behavior as possible.
After looking at some of the online examples, there seems to be an old way (with a TableCursor) and a new way (TableCursor does not mix with CellEditors??).
Currently, my TableViewer without a cursor will scroll in the first column only. The underlying SWT table is showing cursor as null.
Is there a good example of TableViewer using CellEditors and cell navigation via keyboard?
Thanks!
I don't know if there is a good example. I use a cluster of custom code to get what I would consider to be basic table behaviors for my application working on top of TableViewer. (Note that we are still targetting 3.2.2 at this point, so maybe things have gotten better or have otherwise changed.) Some highlights:
I do setCellEditors() on my TableViewer.
On each CellEditor's control, I establish what I consider to be an appropriate TraverseListener. For example, for text cells:
cellEditor = new TextCellEditor(table, SWT.SINGLE | getAlignment());
cellEditor.getControl().addTraverseListener(new TraverseListener() {
public void keyTraversed(TraverseEvent e) {
switch (e.detail) {
case SWT.TRAVERSE_TAB_NEXT:
// edit next column
e.doit = true;
e.detail = SWT.TRAVERSE_NONE;
break;
case SWT.TRAVERSE_TAB_PREVIOUS:
// edit previous column
e.doit = true;
e.detail = SWT.TRAVERSE_NONE;
break;
case SWT.TRAVERSE_ARROW_NEXT:
// Differentiate arrow right from down (they both produce the same traversal #*$&#%^)
if (e.keyCode == SWT.ARROW_DOWN) {
// edit same column next row
e.doit = true;
e.detail = SWT.TRAVERSE_NONE;
}
break;
case SWT.TRAVERSE_ARROW_PREVIOUS:
// Differentiate arrow left from up (they both produce the same traversal #*$&#%^)
if (e.keyCode == SWT.ARROW_UP) {
// edit same column previous row
e.doit = true;
e.detail = SWT.TRAVERSE_NONE;
}
break;
}
}
});
(For drop-down table cells, I catch left and right arrow instead of up and down.)
I also add a TraverseListener to the TableViewer's control whose job it is to begin cell editing if someone hits "return" while an entire row is selected.
// This really just gets the traverse events for the TABLE itself. If there is an active cell editor, this doesn't see anything.
tableViewer.getControl().addTraverseListener(new TraverseListener() {
public void keyTraversed(TraverseEvent e) {
if (e.detail == SWT.TRAVERSE_RETURN) {
// edit first column of selected row
}
}
});
Now, how exactly I control the editing is another story. In my case, my whole TableViewer (and a representation of each column therein) is loosely wrapped up in a custom object with methods to do what the comments above say. The implementations of those methods ultimately end up calling tableViewer.editElement() and then checking tableViewer.isCellEditorActive() to see if the cell was actually editable (so we can skip to the next editable one if not).
I also found it useful to be able to programmatically "relinquish editing" (e.g. when tabbing out of the last cell in a row). Unfortunately the only way I could come up with to do that is a terrible hack determined to work with my particular version by spelunking through the source for things that would produce the desired "side effects":
private void relinquishEditing() {
// OMG this is the only way I could find to relinquish editing without aborting.
tableViewer.refresh("some element you don't have", false);
}
Sorry I can't give a more complete chunk of code, but really, I'd have to release a whole mini-project of stuff, and I'm not prepared to do that now. Hopefully this is enough of a "jumpstart" to get you going.
Here is what has worked for me:
TableViewerFocusCellManager focusCellManager = new TableViewerFocusCellManager(tableViewer,new FocusCellOwnerDrawHighlighter(tableViewer));
ColumnViewerEditorActivationStrategy actSupport = new ColumnViewerEditorActivationStrategy(tableViewer) {
protected boolean isEditorActivationEvent(ColumnViewerEditorActivationEvent event) {
return event.eventType == ColumnViewerEditorActivationEvent.TRAVERSAL
|| event.eventType == ColumnViewerEditorActivationEvent.MOUSE_DOUBLE_CLICK_SELECTION
|| (event.eventType == ColumnViewerEditorActivationEvent.KEY_PRESSED && event.keyCode == SWT.CR)
|| event.eventType == ColumnViewerEditorActivationEvent.PROGRAMMATIC;
}
};
I can navigate in all directions with tab while editing, and arrow around when not in edit mode.
I got it working based on this JFace Snippet, but I had to copy a couple of related classes also:
org.eclipse.jface.snippets.viewers.TableCursor
org.eclipse.jface.snippets.viewers.CursorCellHighlighter
org.eclipse.jface.snippets.viewers.AbstractCellCursor
and I don't remember exactly where I found them. The is also a org.eclipse.swt.custom.TableCursor, but I couldn't get that to work.
Have a look at
Example of enabling Editor Activation on a Double Click.
The stuff between lines [ 110 - 128 ] add a ColumnViewerEditorActivationStrategy and TableViewerEditor. In my case the I wanted a single click to begin editing so i changed line 115 from:
ColumnViewerEditorActivationEvent.MOUSE_DOUBLE_CLICK_SELECTION
to ColumnViewerEditorActivationEvent.MOUSE_CLICK_SELECTION. After adding this to my TableViewer, the tab key would go from field to field with the editor enabled.