The default behaviour when creating a new Eclipse ViewPart is to show the new tab regardless of what happens in the createPartControl function. For example, if didn't create anything, no widgets, nothing, a blank tab will be shown. I don't like this behaviour. I want to close that tab if initialization in createPartControl fails.
Now, I have a mouse-button-context-menu handler that can do this, e.g.
public class MyPartMB3Handler extends AbstractHandler {
#Override
public Object execute(final ExecutionEvent event)
throws ExecutionException {
// Create a view and show it.
IWorkbenchWindow window = HandlerUtil.getActiveWorkbenchWindow(event);
IWorkbenchPage page = window.getActivePage();
try {
MyPart viewPart = (MyPart)page.showView(MyPart.ID);
if(!viewPart.isCreated()) {
page.hideView(viewPart);
}
}
catch(PartInitException e) {
e.printStackTrace();
}
return null;
}
}
The isCreated function is a little hack that lets me know if my ViewPart initialization fails, e.g.
public class MyPart extends ViewPart {
public static final String ID = "com.myplugin.MyPart";
private Composite _parent = null;
#Override
public void createPartControl(Composite parent) {
if(!MyPlugin.createPartControl(parent) { // Some common part creation code I use.
//PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().hideView(this);
return;
}
_parent = parent;
}
#Override
public void setFocus() {
}
public boolean isCreated() {
return _parent != null;
}
}
The problem arises when I launch this ViewPart from the Eclipse "Quick Access" field. I don't own the handler now. From an exception I forced, the handler might be org.eclipse.ui.internal.e4.compatibility.CompatibilityPart.createPartControl or org.eclipse.ui.internal.e4.compatibility.CompatibilityView.createPartControl or org.eclipse.ui.internal.e4.compatibility.CompatibilityPart.create.
I tried hiding the view inside the createPartControl function (see the commented line above), but Eclipse did not like that and spewed a pile of exceptions.
I thought maybe I could throw a PartInitException in createPartControl, but Eclipse tells me I'm not allowed to do that.
So, how do I get my menu handler behaviour when launching from "Quick Access"?
An underlying question might be, is there a better/proper way to achieve this behaviour?
You can close the view by running the hideView asynchronously after the createPartControl has finished - like this:
#Override
public void createPartControl(Composite parent) {
parent.getDisplay().asyncExec(new Runnable() {
#Override
public void run()
{
getSite().getPage().hideView(MyPart.this);
}
});
Related
I'm currently working on a eclipse e4 RCP application and I have a part that serves as a job manager where the user can see all active jobs and their progresses, like one in eclipse. The problem is now that the user can open the progress part by double clicking in the toolbar and he should also be able to close the progress part whenever he wants, but instead of disposing the part I want to just make it invisible.
I thought at first this shouldn't be a problem because I can set the part to be not visible, but the problem is how to catch the closing event and process it by my way. Is there any event, interfaces or listeners I can implement to catch the closing event and prevent the part from getting disposed?
You can implement a CustomSaveHandler and replace the Default Eclipse Save Handler with a Processor. In that SaveHandler you can control if the Part shoud get closed or not. So you could do not close it and make it invisible.
ExampleCode:
public class ReplaceSaveHandlerProcessor {
#Named("your.id.to.window")
#Inject
MWindow window;
#Inject
IEventBroker eventBroker;
#Execute
void installIntoContext() {
eventBroker.subscribe(UIEvents.Context.TOPIC_CONTEXT, new EventHandler() {
#Override
public void handleEvent(final Event event) {
if (UIEvents.isSET(event)) {
if (window.equals(event.getProperty("ChangedElement")) && (window.getContext() != null)) {
window.getContext().runAndTrack(new RunAndTrack() {
private final ISaveHandler saveHandler = new CustomSaveHandler();
#Override
public boolean changed(final IEclipseContext context) {
Object getSaveHandlerValue = context.get(ISaveHandler.class);
if (!saveHandler.equals(getSaveHandlerValue)) { // prevents endless loop
ContextInjectionFactory.inject(saveHandler, window.getContext());
context.set(ISaveHandler.class, saveHandler);
}
return true; // ture keeps tracking and the saveHandler as the only opportunity
}
});
}
}
}
});
}
}
You have to define a Extention for ExtentionPoint org.eclipse.e4.workbench.model
With Your ReplaceSaveHandlerProcessor. (You have to declare the window id as "element" in this extention. (Added Screenshot: )
The CustomSaveHandler have to implement the ISaveHandler interface. In its Methods ypu can say if the Part should realy be closed.
public class CustomSaveHandler implements ISaveHandler {
#Override
public boolean save(MPart dirtyPart, boolean confirm) {
// TODO Auto-generated method stub
return false;
}
#Override
public boolean saveParts(Collection<MPart> dirtyParts, boolean confirm) {
// TODO Auto-generated method stub
return false;
}
#Override
public Save promptToSave(MPart dirtyPart) {
// TODO Auto-generated method stub
return null;
}
#Override
public Save[] promptToSave(Collection<MPart> dirtyParts) {
// TODO Auto-generated method stub
return null;
}
}
I want to call to context menu in my application.
The issue that I don't have any items in the tree.
I active my view and then I want to open context menu.
SWTBotView view = bot.viewByTitle("Project Explorer");
view.bot.tree().contextMenu("New").click();
then I got error message
Could you please advise me how I can open contextMeny without any item in the tree ?
As there is no direct way to do this. I assume you have a shortcut for opening your context menu.
bot.activeShell().pressShortcut(<your shortcut>);
bot.waitUntil(new ContextMenuAppears(tree,
"New"));
tree.contextMenu("New").click();
Where ContextMenuAppears is an ICondition which waits for the desired context menu to appear.
public class ContextMenuAppears implements ICondition {
private SWTBotTree swtBotTree;
private String mMenuText;
public TekstContextMenuAppears(SWTBotTree pSwtBotTree, String menuText) {
swtBotTree = pSwtBotTree;
mMenuText = menuText;
}
#Override
public boolean test() throws Exception {
try {
return swtBotTree.contextMenu(mMenuText).isVisible();
} catch (WidgetNotFoundException e) {
return false;
}
}
#Override
public void init(SWTBot bot) {
// TODO Auto-generated method stub
}
#Override
public String getFailureMessage() {
// TODO Auto-generated method stub
return null;
}
}
depending on what you're trying to achieve, you could try going via the file menu instead of the context menu. "new" should work that way.
My code is below: I am seeing that on running the app the loadWidget method gets invoked even when the adminLink is not clicked. This is not want I want, but I'm not sure what is causing the issue. Please advise
public class LoginModule implements EntryPoint {
LoginPopup loginPopup;
private class LoginPopup extends PopupPanel {
public LoginPopup() {
super(true);
}
public void loadWidget(){
System.out.println("I am called 1");
CommonUi cUi = new CommonUi();
//#342 moved code to common area
FormPanel loginForm = cUi.getLoginFormUi();
setWidget(loginForm);
}
}
#Override
public void onModuleLoad() {
//#251 improved login popup ui.
final Anchor adminLink = new Anchor("User Login");
// final Label adminLink = new Label("User Login");
adminLink.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
// Instantiate the popup and show it.
loginPopup = new LoginPopup();
loginPopup.loadWidget();
loginPopup.showRelativeTo(adminLink);
loginPopup.show();
}
});
if(RootPanel.get("admin") !=null)
RootPanel.get("admin").add(adminLink);
}
}
Running Dev Mode, set a breakpoint in that method in your Java IDE, and take a look at the current stack, what code is calling that method. If that is the only code in your app, then this only appears to be invokable from that onClick handlers, so it is a matter of figuring out why that is being invoked.
So, I have 2 commands, which are identified by PLAY_COMMAND_ID and STOP_COMMAND_ID. Each of command have each handler, respectively playHandler and stopHandler (these are extending AbstractHandler class).
These commands are contributed to my view's toolbar in Button style. Basically what I want is initially the PLAY_COMMAND is active but the STOP_COMMAND not. When the PLAY_COMMAND is clicked, then it will activate the STOP_COMMAND then deactivate itself(PLAY_COMMAND). And vice versa when the STOP_COMMAND clicked.
So what I do is like this. At first it works (I clicked play-button, then stop-button is activated and play-button disabled. I clicked stop-button, then play-button is active and stop-button is disabled. But when I clicked the play-button again, the play-button is still active when the stop-button is active too). So what's wrong with my code here:
private AbstractHandler playHandler, stopHandler, pauseHandler, stepHandler;
private IHandlerActivation playActivation, stopActivation, pauseActivation, stepActivation;
private void createHandlers(){
final IHandlerService handlerService = (IHandlerService)getSite().getService(IHandlerService.class);
playHandler = new AbstractHandler() {
#Override
public Object execute(ExecutionEvent event) throws ExecutionException {
handlerService.deactivateHandler(playActivation);
if(stopActivation == null){
stopActivation = handlerService.activateHandler(STOP_COMMAND_ID, stopHandler);
} else {
handlerService.activateHandler(stopActivation);
}
return null;
}
};
stopHandler = new AbstractHandler() {
#Override
public Object execute(ExecutionEvent event) throws ExecutionException {
handlerService.deactivateHandler(stopActivation);
handlerService.activateHandler(playActivation);
return null;
}
};
playActivation = handlerService.activateHandler(PLAY_COMMAND_ID, playHandler);
}
}
The createHandlers() method is called at the end of createPartControl(Composite parent) method in my View.
Okay, so here what I found. The IHandlerActivation, that is returned when calling activateHandler(IHandlerActivation) method, when it is deactivated, can't be used again in activating the same handler. So the solution is try calling handlerService.activateHandler(commandID, playHandler) instead of calling handlerService.activateHandler(playActivation).
I have been really struggling to get Drag and Drop working in GWT. Last 3 days, I was trying to create a basic drag and drop application and failed. Currently I can drag it around, but I am unable to drop to any location.
How can we solve it? Do we need to modify onDragEnd - I am under the impression that unless I specifically have to do something, I dont have to? I am quite confused.
Also, how do I limit the drop to any single area? I do understand that we can do it using DropController. But I have defined the panels using UiBinder, so how do I get that panel back to link in the DropController? i.e. RootPanel.get() gives me the basic root panel and not the actual panel I want. I tried RootPanel.get("field-id"), but that is showing null even if that id is available. What am I doing wrong?
The code I have written is as follows:
public class TestPanel extends Composite implements
DragHandler, HasMouseDownHandlers, HasMouseUpHandlers, HasMouseMoveHandlers, HasMouseOutHandlers {
interface Binder extends UiBinder<Widget, TestPanel> { }
private static final Binder binder = GWT.create(Binder.class);
#UiField AbsolutePanel absolutePanel;
private PickupDragController TestDragController;
private Image img = new Image("./testicon.png");
public TestPanel(){
initWidget(binder.createAndBindUi(this));
absolutePanel.add(img);
TestDragController = new PickupDragController(RootPanel.get(), false);
AbsolutePositionDropController dropController = new AbsolutePositionDropController(
RootPanel.get());
TestDragController.registerDropController(dropController);
TestDragController.addDragHandler(this);
TestDragController.makeDraggable(this, getDragHandle());
}
private Widget getDragHandle() {
return img;
}
#Override
public void onDragEnd(DragEndEvent event) { }
#Override
public void onDragStart(DragStartEvent event) { }
#Override
public void onPreviewDragEnd(DragEndEvent event) throws VetoDragException { }
#Override
public void onPreviewDragStart(DragStartEvent event) throws VetoDragException { }
#Override
public HandlerRegistration addMouseDownHandler(MouseDownHandler handler) {
return addDomHandler(handler, MouseDownEvent.getType());
}
#Override
public HandlerRegistration addMouseUpHandler(MouseUpHandler handler) {
return addDomHandler(handler, MouseUpEvent.getType());
}
#Override
public HandlerRegistration addMouseMoveHandler(MouseMoveHandler handler) {
return addDomHandler(handler, MouseMoveEvent.getType());
}
#Override
public HandlerRegistration addMouseOutHandler(MouseOutHandler handler) {
return addDomHandler(handler, MouseOutEvent.getType());
}
}
and the testpanel uibinder looks like the following:
<g:AbsolutePanel ui:field="absolutePanel" styleName="{style.panel}">
</g:AbsolutePanel>
If somebody can help me out, I will be very much obliged.
K
P.S: To explain more: I was able to solve the first question by updating onDragEnd as the following:
#Override
public void onDragEnd(DragEndEvent event) {
DragContext context = event.getContext();
RootPanel.get().add(context.draggable, context.desiredDraggableX, context.desiredDraggableY);
}
but, I am not sure whether this is the correct solution - since I think I should not be doing the positioning myself.
If you're new to GWT dnd, why don't you try the working demo ?
There is a lot of examples and all the source code is available.
(And no, you're not supposed to do the positionning yourself)
You have to add a DragOverHandler on the drop target(s): even if it does nothing, it defines the component as a drop target.
Of course, you still need to define the DropHandler too on this component (and optionally, DragEnterHandler and DragLeaveHandler for visual feedback, in general).
The DragEndHandler is called even if the target isn't reached (drag abandoned in a non-drop area), it is used to change the state of the dragged object, you might need to set a way for the DropHandler to communicate success on dropping to the DragEndHandler (shared variable, EventBus, etc.).