ClickEvent Error in AppInventor-Sources

[Horizon]

Hello everybody,
I was working on app inventor sources and i have triggered this error,
actually i was adding option to rename source structure item using a button added to a box, i had made my own code, but while compiling i got silly error which is Cannot find symbol : ClickEvent in this code

deleteButton.addClickHandler(new ClickHandler() {
      @Override
         public void onClick(ClickEvent event){
        sourceStructureExplorer.deleteItemFromTree();
      }
    });

This is the full log

$ ant noplay
Buildfile: D:\appinventor-sources\appinventor\build.xml

noplay:

init:

MakeWarLibsDir:

common_CommonUtils:

init:

CommonUtils:

common_CommonVersion:

init:

CommonVersion:

components_CommonConstants:

init:

CommonConstants:

WarLibs:

AiSharedLib:

AiServerLib:

components_AndroidRuntime:

common_CommonVersion:

init:

CommonVersion:

init:

HtmlEntities:

Barcode:

CopyComponentLibraries:

common_CommonUtils:

init:

CommonUtils:

CommonConstants:

AnnotationProcessors:

AndroidRuntime.uptodate:

AndroidRuntime:

AiClientLib:
   [depend] Deleted 105 out of date files in 1 seconds
    [javac] Compiling 203 source files to D:\appinventor-sources\appinventor\appengine\build\war\WEB-INF\classes
    [javac] D:\appinventor-sources\appinventor\appengine\src\com\google\appinventor\client\boxes\SourceStructureBox.java:69: error: cannot find symbol
    [javac]          public void onClick(ClickEvent event) {
    [javac]                              ^
    [javac]   symbol: class ClickEvent
    [javac] D:\appinventor-sources\appinventor\appengine\src\com\google\appinventor\client\boxes\SourceStructureBox.java:87: error: cannot find symbol
    [javac]          public void onClick(ClickEvent event){
    [javac]                              ^
    [javac]   symbol: class ClickEvent
    [javac] Note: Some input files use or override a deprecated API.
    [javac] Note: Recompile with -Xlint:deprecation for details.
    [javac] Note: Some input files use unchecked or unsafe operations.
    [javac] Note: Recompile with -Xlint:unchecked for details.
    [javac] 2 errors

BUILD FAILED
D:\appinventor-sources\appinventor\build.xml:50: The following error occurred while executing this line:
D:\appinventor-sources\appinventor\appengine\build.xml:545: The following error occurred while executing this line:
D:\appinventor-sources\appinventor\build-common.xml:125: Compile failed; see the compiler error output for details.

Total time: 19 seconds

I don't know the reason,
Help will be appreciated
Thank You

[vknow360]

@Horizon

ClickEvent

You haven't imported this class.

[Kevinkun]

Where are you writing your code?
Recommend to use IDE like Eclipse, which can import the necessary package automatically, and have code prompt function.

[Horizon]

I am using VS code and i do also have Intellij, and i know that this can be the case of importing, but i have seen this file too where this event is there and there's no import for this,

P.S. I found it just now,
Actually there is one more java file which has Click Handler and i have viewed it's all the imports and slipped this one to see specially and i thought that there will be no need for import

Anyways Thanks to both of you

[ewpatton]

In Java, each file is its own compilation unit. Classes can see other classes within their package without imports, but otherwise you need to import a class in every file you plan to use it.