为什么这段代码会失败?
我想更改动态构造的一系列多个面板中的一个面板的颜色(面板总数事先未知)。
由于某种原因,此代码在引用特定面板的名称(例如“panel2”)时有效,但在我动态引用它(“panelID”)时则无效。
import groovy.swing.SwingBuilder
import javax.swing.WindowConstants as WC
import javax.swing.JOptionPane
import javax.swing.BoxLayout as BXL
swing = new SwingBuilder()
frame = swing.frame(title:'test',
defaultCloseOperation:WC.DISPOSE_ON_CLOSE) {
panel(id:'mainPanel'){
def panelID
(1..6).each {
panelID = 'panel' + it
panel(alignmentX: 0f, id: panelID , opaque:true ,background : java.awt.Color.GREEN){
label('description')
textField(id: "description$it", text: panelID, columns: 70 )
button(id: "button$panelID", text: panelID, actionPerformed : {
panelID.background = java.awt.Color.RED
panelID.repaint()
})
}
}
boxLayout(axis: BXL.Y_AXIS)
panel(id:'secondPanel' , alignmentX: 0f){
button('Quit', actionPerformed:{
dispose()
})
}
}
}
frame.pack()
frame.show()
要根据元素的 ID 获取元素,您需要将 ID 作为 SwingBuilder 的参数进行访问,如下所示:
import groovy.swing.SwingBuilder
import javax.swing.WindowConstants as WC
import javax.swing.JOptionPane
import javax.swing.BoxLayout as BXL
swing = new SwingBuilder()
frame = swing.frame(title:'test', pack:true, visible:true, defaultCloseOperation:WC.DISPOSE_ON_CLOSE) {
panel(id:'mainPanel'){
(1..6).each { num ->
def panelID = "panel$num"
def pane = panel( alignmentX:0f, id:panelID, background:java.awt.Color.GREEN ) {
label('description')
textField(id: "description$num", text:panelID, columns: 70 )
button(id: "buttonpanel$num", text:panelID, actionPerformed : {
swing."$panelID".background = java.awt.Color.RED
})
}
}
boxLayout(axis: BXL.Y_AXIS)
panel(id:'secondPanel' , alignmentX: 0f){
button('Quit', actionPerformed:{
frame.visible = false
})
}
}
}
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