allow alerts to be cancelable

anko/library/robolectricTests/src/test/java/DialogsTest.kt

@@ -7,8 +7,7 @@ import android.view.View
 import android.widget.Button
 import org.jetbrains.anko.*
 import org.jetbrains.anko.sdk15.listeners.onClick
-import org.junit.Assert.assertEquals
-import org.junit.Assert.assertNotNull
+import org.junit.Assert.*
 import org.junit.Test
 import org.junit.runner.RunWith
 import org.robolectric.Robolectric
@@ -41,6 +40,15 @@ open class DialogsTestActivity : Activity() {
                     }.show()
                 }
             }
+            button {
+                id = 4
+                onClick {
+                    alert("Message", "NonCancelable") {
+                        isCancelable = false
+                        positiveButton("Ok") { dialog -> dialog.dismiss()  }
+                    }.show()
+                }
+            }
         }
     }
 }
@@ -53,6 +61,7 @@ open class DialogsTestActivity : Activity() {
         val button1 = activity.findViewById(1) as Button
         val button2 = activity.findViewById(2) as Button
         val button3 = activity.findViewById(3) as Button
+        val button4 = activity.findViewById(4) as Button
 
         button1.performClick()
         ShadowLooper.idleMainLooper()
@@ -77,7 +86,15 @@ open class DialogsTestActivity : Activity() {
         assertEquals(View.GONE, alert.getButton(DialogInterface.BUTTON_NEUTRAL).visibility)
         alert.dismiss()
 
+        ShadowLooper.idleMainLooper()
+
+        button4.performClick()
+        val nonCancelableAlert = ShadowAlertDialog.getLatestAlertDialog()
+        assertNotNull(nonCancelableAlert)
+        val nonCancelableAlertShadow = ShadowExtractor.extract(nonCancelableAlert) as ShadowAlertDialog
+        assertEquals("NonCancelable", nonCancelableAlertShadow.title.toString())
+        assertFalse(nonCancelableAlertShadow.isCancelable)
+
         println("[COMPLETE]")
     }
-
 }

anko/library/static/appcompatV7/src/SupportAlertBuilder.kt

@@ -16,13 +16,14 @@
 
 package org.jetbrains.anko.appcompat.v7
 
-import org.jetbrains.anko.*
 import android.content.Context
 import android.content.DialogInterface
 import android.graphics.drawable.Drawable
 import android.support.v7.app.AlertDialog
 import android.view.KeyEvent
 import android.view.View
+import org.jetbrains.anko.AlertBuilder
+import org.jetbrains.anko.AlertBuilderFactory
 import org.jetbrains.anko.internals.AnkoInternals
 import org.jetbrains.anko.internals.AnkoInternals.NO_GETTER
 import kotlin.DeprecationLevel.ERROR
@@ -64,6 +65,10 @@ internal class AppcompatAlertBuilder(override val ctx: Context) : AlertBuilder<A
         @Deprecated(NO_GETTER, level = ERROR) get() = AnkoInternals.noGetter()
         set(value) { builder.setView(value) }
 
+    override var isCancelable: Boolean
+        @Deprecated(NO_GETTER, level = ERROR) get() = AnkoInternals.noGetter()
+        set(value) { builder.setCancelable(value) }
+
     override fun onCancelled(handler: (DialogInterface) -> Unit) {
         builder.setOnCancelListener(handler)
     }

anko/library/static/commons/src/dialogs/AlertBuilder.kt

@@ -58,6 +58,9 @@ interface AlertBuilder<out D : DialogInterface> {
     var customView: View
         @Deprecated(NO_GETTER, level = ERROR) get
 
+    var isCancelable: Boolean
+        @Deprecated(NO_GETTER, level = ERROR) get
+
     fun onCancelled(handler: (dialog: DialogInterface) -> Unit)
 
     fun onKeyPressed(handler: (dialog: DialogInterface, keyCode: Int, e: KeyEvent) -> Boolean)

anko/library/static/commons/src/dialogs/AndroidAlertBuilder.kt

@@ -63,6 +63,10 @@ internal class AndroidAlertBuilder(override val ctx: Context) : AlertBuilder<Ale
         @Deprecated(NO_GETTER, level = ERROR) get() = AnkoInternals.noGetter()
         set(value) { builder.setView(value) }
 
+    override var isCancelable: Boolean
+        @Deprecated(NO_GETTER, level = ERROR) get() = AnkoInternals.noGetter()
+        set(value) { builder.setCancelable(value) }
+
     override fun onCancelled(handler: (DialogInterface) -> Unit) {
         builder.setOnCancelListener(handler)
     }