added a bunch more swing helper methods; such as an easy function for doing the dreaded grid bag layout and helper properties so its easy to set a width or height for size/preferredSize/minimumSize/maximumSize on components

libraries/kotlin-swing/src/main/kotlin/kotlin/swing/Components.kt

@@ -1,11 +1,59 @@
 package kotlin.swing
 
+import java.awt.Dimension
+import java.awt.Component
 import javax.swing.JComponent
 
 var JComponent.description: String?
-get() {
-    return getAccessibleContext()?.getAccessibleDescription()
-}
-set(value) {
-    getAccessibleContext()?.setAccessibleDescription(value)
-}
+    get() {
+        return getAccessibleContext()?.getAccessibleDescription()
+    }
+    set(value) {
+        getAccessibleContext()?.setAccessibleDescription(value)
+    }
+
+var JComponent.preferredWidth: Int
+    get() = getPreferredSize().width()
+    set(value) {
+        setPreferredSize(getPreferredSize().width(value))
+    }
+var JComponent.preferredHeight: Int
+    get() = getPreferredSize().height()
+    set(value) {
+        setPreferredSize(getPreferredSize().height(value))
+    }
+
+var Component.minimumWidth: Int
+    get() = getMinimumSize().width()
+    set(value) {
+        setMinimumSize(getMinimumSize().width(value))
+    }
+var Component.minimumHeight: Int
+    get() = getMinimumSize().height()
+    set(value) {
+        setMinimumSize(getMinimumSize().height(value))
+    }
+
+var Component.maximumWidth: Int
+    get() = getMaximumSize().width()
+    set(value) {
+        setMaximumSize(getMaximumSize().width(value))
+    }
+var Component.maximumHeight: Int
+    get() = getMaximumSize().height()
+    set(value) {
+        setMaximumSize(getMaximumSize().height(value))
+    }
+
+var Component.width: Int
+    get() = getSize().width()
+    set(value) {
+        setSize(getSize().width(value))
+    }
+var Component.height: Int
+    get() = getSize().height()
+    set(value) {
+        setSize(getSize().height(value))
+    }
+
+

libraries/kotlin-swing/src/main/kotlin/kotlin/swing/Dimensions.kt

@@ -0,0 +1,32 @@
+package kotlin.swing
+
+import java.awt.Dimension
+import java.awt.Component
+import javax.swing.JComponent
+
+/**
+ * Returns the width of the dimension or zero if its null
+ */
+fun Dimension?.width(): Int {
+    return if (this == null) 0 else this.width
+}
+
+/**
+ * Returns the height of the dimension or zero if its null
+ */
+fun Dimension?.height(): Int {
+    return if (this == null) 0 else this.height
+}
+
+/**
+ * Returns a new dimension with the same height and the given width
+ */
+fun Dimension?.width(newValue: Int): Dimension {
+    return Dimension(newValue, height())
+}
+/**
+ * Returns a new dimension with the same width and the given height
+ */
+fun Dimension?.height(newValue: Int): Dimension {
+    return Dimension(width(), newValue)
+}

libraries/kotlin-swing/src/main/kotlin/kotlin/swing/Layouts.kt

@@ -0,0 +1,37 @@
+package kotlin.swing
+
+import java.awt.GridBagConstraints
+
+/**
+ * Helper function to create a [GridBagConstraints]
+ */
+fun gridBagContraints(gridx: Int? = null, gridy: Int? = null, fill: Int? = null, anchor: Int? = null,
+                      gridwidth: Int? = null, gridheight: Int? = null,
+                      weightx: Double? = null, weighty: Double? = null): GridBagConstraints {
+    val answer = GridBagConstraints()
+    if (gridx != null) {
+        answer.gridx = gridx
+    }
+    if (gridy != null) {
+        answer.gridy = gridy
+    }
+    if (fill != null) {
+        answer.fill = fill
+    }
+    if (anchor != null) {
+        answer.anchor = anchor
+    }
+    if (gridwidth != null) {
+        answer.gridwidth = gridwidth
+    }
+    if (gridheight != null) {
+        answer.gridheight = gridheight
+    }
+    if (weightx != null) {
+        answer.weightx = weightx
+    }
+    if (weighty != null) {
+        answer.weighty = weighty
+    }
+    return answer
+}