如何从自己的smalltalk中删除HandleMorph的attachMorph

Question

我需要你的帮助我正在使用此代码从特定位置到鼠标位置创建一条线。单击后我试图删除此行，但我不知道如何请帮我删除点击后的直播我应该更改什么？

stk:=  (LineMorph from: 100@100 to: 1300@1300 color: Color red width: 2) openInWorld.
handle := HandleMorph new forEachPointDo:  [:newPoint | stk setVertices: {whiteBallinHole position. (newPoint-(10@10)). }.
stk on: #mouseDown send: #value: to:[:evt|
    evt redButtonPressed ifTrue:[  self handlesMouseDown:  evt.

"DELETE THE STICK AFTER MOUSE CLICK THIS DOSNT WORK PLEASE HELP"

stk color: Color transparent.
stk delete.

""

 ].
    ].
    ]. 
    " (self  currentHand attachMorph: handle)."
    " self currentHand addMorph:handle. "
    self currentHand attachMorph:handle.

Answer 1

代码有点乱。不合适的一件事是

self handlesMouseDown: evt.

如果您想接收 mouseDown: 消息，那应该 return 为真。在工作区中，那个自我不存在。结果从未使用过。只需删除它。生成的代码类似于

whiteBallinHole := CircleMorph new openInWorld .
stk := (LineMorph 
    from: 100@100 to: 1300@1300 
    color: Color red 
    width: 4) openInWorld.
handle := HandleMorph new forEachPointDo: [ :newPoint | 
stk setVertices: {whiteBallinHole center. (newPoint-(10@10)). }.
stk on: #mouseDown send: #value: to: [:evt|
    evt redButtonPressed ifTrue:[
        stk color: Color transparent.
        stk delete]]].
self currentHand attachMorph: handle.

如何从自己的smalltalk中删除HandleMorph的attachMorph

How to remove an attachMorph of HandleMorph in smalltalk from self

smalltalk

squeak

gnu-smalltalk