From f3ae913aa05fedd33c5b706f75cf6c37310a3f84 Mon Sep 17 00:00:00 2001
From: Artur Signell <artur@vaadin.com>
Date: Tue, 4 Aug 2015 00:16:04 +0300
Subject: [PATCH] Fix NPE when clicking and move handler is not set (#8718)

Change-Id: I13dfe9344d7ca516d41145e4c35fc45c620cac56
---
 .../ui/calendar/schedule/DateCellDayEvent.java    |  9 +++++++--
 .../ui/calendar/schedule/SimpleDayCell.java       |  7 +++++--
 .../components/calendar/NullEventMoveHandler.java | 14 ++++++++++++--
 .../calendar/NullEventMoveHandlerTest.java        | 15 +++++++++++++++
 4 files changed, 39 insertions(+), 6 deletions(-)

diff --git a/client/src/com/vaadin/client/ui/calendar/schedule/DateCellDayEvent.java b/client/src/com/vaadin/client/ui/calendar/schedule/DateCellDayEvent.java
index 1a54fe0454..55834397d3 100644
--- a/client/src/com/vaadin/client/ui/calendar/schedule/DateCellDayEvent.java
+++ b/client/src/com/vaadin/client/ui/calendar/schedule/DateCellDayEvent.java
@@ -268,8 +268,13 @@ public class DateCellDayEvent extends FocusableHTML implements
         }
         int endX = event.getClientX();
         int endY = event.getClientY();
-        int xDiff = startX - endX;
-        int yDiff = startY - endY;
+        int xDiff = 0, yDiff = 0;
+        if (startX != -1 && startY != -1) {
+            // Drag started
+            xDiff = startX - endX;
+            yDiff = startY - endY;
+        }
+
         startX = -1;
         startY = -1;
         mouseMoveStarted = false;
diff --git a/client/src/com/vaadin/client/ui/calendar/schedule/SimpleDayCell.java b/client/src/com/vaadin/client/ui/calendar/schedule/SimpleDayCell.java
index 3bf6930933..158241337b 100644
--- a/client/src/com/vaadin/client/ui/calendar/schedule/SimpleDayCell.java
+++ b/client/src/com/vaadin/client/ui/calendar/schedule/SimpleDayCell.java
@@ -392,8 +392,11 @@ public class SimpleDayCell extends FocusableFlowPanel implements
 
             int endX = event.getClientX();
             int endY = event.getClientY();
-            int xDiff = startX - endX;
-            int yDiff = startY - endY;
+            int xDiff = 0, yDiff = 0;
+            if (startX != -1 && startY != -1) {
+                xDiff = startX - endX;
+                yDiff = startY - endY;
+            }
             startX = -1;
             startY = -1;
             prevDayDiff = 0;
diff --git a/uitest/src/com/vaadin/tests/components/calendar/NullEventMoveHandler.java b/uitest/src/com/vaadin/tests/components/calendar/NullEventMoveHandler.java
index c2dfdb26c1..40dd43abb2 100644
--- a/uitest/src/com/vaadin/tests/components/calendar/NullEventMoveHandler.java
+++ b/uitest/src/com/vaadin/tests/components/calendar/NullEventMoveHandler.java
@@ -5,17 +5,27 @@ import java.text.SimpleDateFormat;
 import java.util.Locale;
 
 import com.vaadin.server.VaadinRequest;
-import com.vaadin.tests.components.AbstractTestUI;
+import com.vaadin.tests.components.AbstractTestUIWithLog;
 import com.vaadin.ui.Calendar;
 import com.vaadin.ui.components.calendar.CalendarComponentEvents;
+import com.vaadin.ui.components.calendar.CalendarComponentEvents.EventClick;
+import com.vaadin.ui.components.calendar.CalendarComponentEvents.EventClickHandler;
 import com.vaadin.ui.components.calendar.event.BasicEvent;
 
-public class NullEventMoveHandler extends AbstractTestUI {
+public class NullEventMoveHandler extends AbstractTestUIWithLog {
     @Override
     protected void setup(VaadinRequest request) {
         Calendar calendar = getCalendar();
 
         calendar.setHandler((CalendarComponentEvents.EventMoveHandler) null);
+        calendar.setHandler(new EventClickHandler() {
+
+            @Override
+            public void eventClick(EventClick event) {
+                log("Clicked on " + event.getCalendarEvent().getCaption());
+
+            }
+        });
 
         addComponent(calendar);
     }
diff --git a/uitest/src/com/vaadin/tests/components/calendar/NullEventMoveHandlerTest.java b/uitest/src/com/vaadin/tests/components/calendar/NullEventMoveHandlerTest.java
index c40cd9ce97..156100310c 100644
--- a/uitest/src/com/vaadin/tests/components/calendar/NullEventMoveHandlerTest.java
+++ b/uitest/src/com/vaadin/tests/components/calendar/NullEventMoveHandlerTest.java
@@ -3,6 +3,7 @@ package com.vaadin.tests.components.calendar;
 import static org.hamcrest.core.Is.is;
 import static org.junit.Assert.assertThat;
 
+import org.junit.Assert;
 import org.junit.Test;
 import org.openqa.selenium.By;
 import org.openqa.selenium.WebElement;
@@ -22,12 +23,26 @@ public class NullEventMoveHandlerTest extends DndActionsTest {
         assertEventCannotBeMoved();
     }
 
+    @Test
+    public void eventIsClickableWhenNotMovableInMonthView() {
+        getEvent().click();
+        Assert.assertEquals("1. Clicked on foo", getLogRow(0));
+    }
+
     @Test
     public void eventIsNotMovableInWeekView() {
         openWeekView();
         assertEventCannotBeMoved();
     }
 
+    @Test
+    public void eventIsClickableWhenNotMovableInWeekView() {
+        openWeekView();
+        getEvent().findElement(By.className("v-calendar-event-caption"))
+                .click();
+        Assert.assertEquals("1. Clicked on foo", getLogRow(0));
+    }
+
     private void assertEventCannotBeMoved() {
         int originalPosition = getEventXPosition();
 
-- 
2.39.5