reading text from JInputField to support multilingual input

Former-commit-id: 4dc1228ba000f88d3af29569aa3954cb8acc4d90
Former-commit-id: 7fd7f8bd4f35e3be30cd9fa0da96684a48eedad3

src/net/torvald/terrarum/swingapp/IMStringReader.kt

@@ -0,0 +1,103 @@
+package net.torvald.terrarum.swingapp
+
+import net.torvald.terrarum.langpack.Lang
+import org.newdawn.slick.GameContainer
+import java.awt.BorderLayout
+import java.awt.FlowLayout
+import java.awt.event.*
+import javax.swing.*
+
+
+/**
+ * Multilingual string input
+ *
+ * This kind of hack was often used in retro games that does not support multilingual input per se,
+ * so it would give you a pop-up with text field to get the string input from user, using resources
+ * provided by the OS.
+ *
+ * This hack is still alive, for example: "Princess Maker 2 Refine" on Steam, when installed in
+ * Chinese/Japanese/Korean Language. Although the game was released in 2016 via Steam (hence the "Refine"),
+ * the original game were released on 1995.
+ *
+ * Although admittedly, Korean input does not require this hack, you can just write the Input Method
+ * out of Java/Kotlin as the language does not need conversion (jp. Henkan) exists in Chinese and Japanese.
+ *
+ * Created by SKYHi14 on 2017-02-05.
+ */
+class IMStringReader(gc: GameContainer, feedInput: (String) -> Unit, message: String? = null) : JFrame() {
+
+    private val inputArea = JTextField()
+    private val buttonOkay = JButton(Lang["MENU_LABEL_OK"])
+    private val buttonCancel = JButton(Lang["MENU_LABEL_CANCEL"])
+
+    private val labelTitle = message ?: "Enter some text"
+
+
+    var userInput: String = ""//null
+        private set
+
+
+    init {
+        this.title = labelTitle
+        defaultCloseOperation = JFrame.DISPOSE_ON_CLOSE
+
+        gc.pause()
+
+        buttonOkay.addMouseListener(object : MouseListener {
+            override fun mouseEntered(e: MouseEvent?) { }
+            override fun mouseClicked(e: MouseEvent?) { }
+            override fun mouseReleased(e: MouseEvent?) { }
+            override fun mouseExited(e: MouseEvent?) { }
+            override fun mousePressed(e: MouseEvent?) {
+                userInput = inputArea.text
+                isVisible = false
+                gc.isPaused = false
+
+                feedInput(userInput)
+
+                dispose()
+            }
+        })
+
+        buttonCancel.addMouseListener(object : MouseListener {
+            override fun mouseEntered(e: MouseEvent?) { }
+            override fun mouseClicked(e: MouseEvent?) { }
+            override fun mouseReleased(e: MouseEvent?) { }
+            override fun mouseExited(e: MouseEvent?) { }
+            override fun mousePressed(e: MouseEvent?) {
+                userInput = ""//null
+                isVisible = false
+                gc.isPaused = false
+
+                dispose()
+            }
+        })
+
+        this.addKeyListener(object : KeyListener {
+            override fun keyTyped(e: KeyEvent?) { }
+            override fun keyReleased(e: KeyEvent?) { }
+            override fun keyPressed(e: KeyEvent?) {
+                userInput = inputArea.text
+                isVisible = false
+                gc.isPaused = false
+
+                feedInput(userInput)
+
+                dispose()
+            }
+        })
+
+        val buttonsArea = JPanel()
+        buttonsArea.layout = FlowLayout()
+        buttonsArea.add(buttonOkay)
+        buttonsArea.add(buttonCancel)
+
+        this.layout = BorderLayout(2, 2)
+        this.add(JLabel(labelTitle), BorderLayout.PAGE_START)
+        this.add(inputArea, BorderLayout.CENTER)
+        this.add(buttonsArea, BorderLayout.PAGE_END)
+        this.isVisible = true
+        this.setSize(240, 118)
+    }
+
+}