PAINTROID-672: Refactor MediaGalleryWebViewClient to kotlin

Paintroid/src/main/java/org/catrobat/paintroid/web/MediaGalleryWebViewClient.kt

@@ -0,0 +1,67 @@
+/*
+ * Catroid: An on-device visual programming system for Android devices
+ * Copyright (C) 2010-2018 The Catrobat Team
+ * (<http://developer.catrobat.org/credits>)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * An additional term exception under section 7 of the GNU Affero
+ * General Public License, version 3, is available at
+ * http://developer.catrobat.org/license_additional_term
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.catrobat.paintroid.web
+
+import android.app.ProgressDialog
+import android.graphics.Bitmap
+import android.webkit.WebView
+import android.webkit.WebViewClient
+import org.catrobat.paintroid.R
+
+class MediaGalleryWebViewClient(private val callback: WebClientCallback) : WebViewClient() {
+    private var webViewLoadingDialog: ProgressDialog? = null
+
+    interface WebClientCallback {
+        fun finish()
+    }
+
+    override fun onPageStarted(view: WebView, urlClient: String, favicon: Bitmap) {
+        if (webViewLoadingDialog == null && !urlClient.matches("https://share.catrob.at/pocketcode/".toRegex())) {
+            webViewLoadingDialog = ProgressDialog(view.context, R.style.WebViewLoadingCircle)
+            webViewLoadingDialog!!.setCancelable(true)
+            webViewLoadingDialog!!.setCanceledOnTouchOutside(false)
+            webViewLoadingDialog!!.setProgressStyle(android.R.style.Widget_ProgressBar_Small)
+            webViewLoadingDialog!!.show()
+        } else {
+            callback.finish()
+        }
+    }
+
+    override fun onPageFinished(view: WebView, url: String) {
+        if (webViewLoadingDialog != null) {
+            webViewLoadingDialog!!.dismiss()
+            webViewLoadingDialog = null
+        }
+    }
+
+    override fun shouldOverrideUrlLoading(view: WebView, url: String) = false
+
+    override fun onReceivedError(
+        view: WebView,
+        errorCode: Int,
+        description: String,
+        failingUrl: String
+    ) {
+        callback.finish()
+    }
+}