From 71a58ed337988931ae4332bad24f10e8243367b8 Mon Sep 17 00:00:00 2001
From: Pierre <pierre@hubert.fr>
Date: Sat, 28 Apr 2018 11:08:42 +0200
Subject: [PATCH] Created ScrollListView

---
 .idea/misc.xml                                |   2 +-
 .../OnScrollChangeDetectListener.java         |  19 ++++
 .../client/ui/views/ScrollListView.java       | 102 ++++++++++++++++++
 .../main/res/layout/fragment_conversation.xml |   2 +-
 4 files changed, 123 insertions(+), 2 deletions(-)
 create mode 100644 app/src/main/java/org/communiquons/android/comunic/client/ui/listeners/OnScrollChangeDetectListener.java
 create mode 100644 app/src/main/java/org/communiquons/android/comunic/client/ui/views/ScrollListView.java

diff --git a/.idea/misc.xml b/.idea/misc.xml
index 503aca7..33952c6 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -55,7 +55,7 @@
     <ConfirmationsSetting value="0" id="Add" />
     <ConfirmationsSetting value="0" id="Remove" />
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" assert-keyword="true" jdk-15="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_7" default="true" assert-keyword="true" jdk-15="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">
diff --git a/app/src/main/java/org/communiquons/android/comunic/client/ui/listeners/OnScrollChangeDetectListener.java b/app/src/main/java/org/communiquons/android/comunic/client/ui/listeners/OnScrollChangeDetectListener.java
new file mode 100644
index 0000000..2a3aa46
--- /dev/null
+++ b/app/src/main/java/org/communiquons/android/comunic/client/ui/listeners/OnScrollChangeDetectListener.java
@@ -0,0 +1,19 @@
+package org.communiquons.android.comunic.client.ui.listeners;
+
+/**
+ * On Scroll change listener
+ *
+ * This listener works with {@link org.communiquons.android.comunic.client.ui.views.ScrollListView}
+ *
+ * @author Pierre HUBERT
+ * Created by pierre on 4/28/18.
+ */
+
+public interface OnScrollChangeDetectListener {
+
+    /**
+     * This method is triggered when the user reach the top (first item) of the list view
+     */
+    void onReachTop();
+
+}
diff --git a/app/src/main/java/org/communiquons/android/comunic/client/ui/views/ScrollListView.java b/app/src/main/java/org/communiquons/android/comunic/client/ui/views/ScrollListView.java
new file mode 100644
index 0000000..87d5abc
--- /dev/null
+++ b/app/src/main/java/org/communiquons/android/comunic/client/ui/views/ScrollListView.java
@@ -0,0 +1,102 @@
+package org.communiquons.android.comunic.client.ui.views;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.widget.AbsListView;
+
+import org.communiquons.android.comunic.client.ui.listeners.OnScrollChangeDetectListener;
+
+/**
+ * Custom ListView with extended functions
+ *
+ * This class use some concepts from maXp StackOverFlow answer
+ * on question "Detect Scroll Up & Scroll down in ListView"
+ *
+ * @author Pierre HUBERT
+ * Created by pierre on 4/28/18.
+ */
+
+public class ScrollListView extends android.widget.ListView {
+
+    /**
+     * Debug tag
+     */
+    private static final String TAG = "ScrollListView";
+
+    /**
+     * Optional additional scroll listener
+     */
+    private OnScrollListener onScrollListener;
+
+    /**
+     * Scroll change detection listener
+     */
+    private OnScrollChangeDetectListener onScrollChangeDetectListener;
+
+    public ScrollListView(Context context) {
+        super(context);
+        init();
+    }
+
+    public ScrollListView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init();
+    }
+
+    public ScrollListView(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+        init();
+    }
+
+    public ScrollListView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+        init();
+    }
+
+    /**
+     * Initialize this view
+     */
+    private void init(){
+
+        super.setOnScrollListener(new OnScrollListener() {
+            @Override
+            public void onScrollStateChanged(AbsListView view, int scrollState) {
+
+                //Call additional listener (if any)
+                if(onScrollListener != null)
+                    onScrollListener.onScrollStateChanged(view, scrollState);
+
+            }
+
+            @Override
+            public void onScroll(AbsListView view, int firstVisibleItem,
+                                 int visibleItemCount, int totalItemCount) {
+
+                //Call additional listener (if any)
+                if(onScrollListener != null)
+                    onScrollListener.onScroll(view, firstVisibleItem,
+                            visibleItemCount, totalItemCount);
+
+
+                if(onScrollChangeDetectListener != null && firstVisibleItem == 0
+                        && visibleItemCount > 0)
+                    onScrollChangeDetectListener.onReachTop();
+            }
+        });
+
+    }
+
+    @Override
+    public void setOnScrollListener(OnScrollListener onScrollListener) {
+        this.onScrollListener = onScrollListener;
+    }
+
+    public void setOnScrollChangeDetectListener(OnScrollChangeDetectListener onScrollChangeDetectListener) {
+        this.onScrollChangeDetectListener = onScrollChangeDetectListener;
+    }
+
+    public OnScrollListener getOnScrollListener() {
+        return onScrollListener;
+    }
+}
diff --git a/app/src/main/res/layout/fragment_conversation.xml b/app/src/main/res/layout/fragment_conversation.xml
index e1e323f..1dc0435 100644
--- a/app/src/main/res/layout/fragment_conversation.xml
+++ b/app/src/main/res/layout/fragment_conversation.xml
@@ -21,7 +21,7 @@
         android:layout_marginTop="10dp"/>
 
     <!-- Messages -->
-    <ListView
+    <org.communiquons.android.comunic.client.ui.views.ScrollListView
         android:id="@+id/fragment_conversation_messageslist"
         android:layout_width="match_parent"
         android:layout_height="0dp"