#69 added button disabling take part, if cur user already taken part

src/main/java/ru/ulstu/conference/controller/ConferenceController.java

@@ -51,6 +51,7 @@ public class ConferenceController {
         if (id != null && id > 0) {
             ConferenceDto conferenceDto = conferenceService.findOneDto(id);
             conferenceDto.setNotSelectedPapers(getNotSelectPapers(conferenceDto.getPaperIds()));
+            conferenceDto.setDisabledTakePart(isCurrentUserParticipant(conferenceDto.getUsers()));
             modelMap.put("conferenceDto", conferenceDto);
         } else {
             ConferenceDto conferenceDto = new ConferenceDto();
@@ -119,6 +120,10 @@ public class ConferenceController {
         return conferenceService.getConferencePapers(paperIds);
     }
 
+    public boolean isCurrentUserParticipant(List<ConferenceUser> conferenceUsers) {
+        return conferenceService.isCurrentUserParticipant(conferenceUsers);
+    }
+
     @ModelAttribute("allParticipation")
     public List<ConferenceUser.Participation> getAllParticipation() {
         return conferenceService.getAllParticipations();

src/main/java/ru/ulstu/conference/model/ConferenceDto.java

@@ -40,7 +40,7 @@ public class ConferenceDto {
     private List<Paper> papers = new ArrayList<>();
     private List<Paper> notSelectedPapers = new ArrayList<>();
     private List<ConferenceUser> users = new ArrayList<>();
-    private Integer filterUserId;
+    private boolean disabledTakePart = false;
 
     public ConferenceDto() {
     }
@@ -58,7 +58,8 @@ public class ConferenceDto {
                          @JsonProperty("paperIds") List<Integer> paperIds,
                          @JsonProperty("users") List<ConferenceUser> users,
                          @JsonProperty("papers") List<Paper> papers,
-                         @JsonProperty("notSelectedPapers") List<Paper> notSelectedPapers) {
+                         @JsonProperty("notSelectedPapers") List<Paper> notSelectedPapers,
+                         @JsonProperty("notSelectedPapers") Boolean disabledTakePart) {
         this.id = id;
         this.title = title;
         this.description = description;
@@ -72,6 +73,7 @@ public class ConferenceDto {
         this.users = users;
         this.papers = papers;
         this.notSelectedPapers = notSelectedPapers;
+        this.disabledTakePart = disabledTakePart;
     }
 
     public ConferenceDto(Conference conference) {
@@ -87,7 +89,6 @@ public class ConferenceDto {
         this.paperIds = convert(conference.getPapers(), paper -> paper.getId());
         this.users = conference.getUsers();
         this.papers = conference.getPapers();
-
     }
 
     public Integer getId() {
@@ -186,12 +187,12 @@ public class ConferenceDto {
         this.users = users;
     }
 
-    public Integer getFilterUserId() {
-        return filterUserId;
+    public boolean isDisabledTakePart() {
+        return disabledTakePart;
     }
 
-    public void setFilterUserId(Integer filterUserId) {
-        this.filterUserId = filterUserId;
+    public void setDisabledTakePart(boolean disabledTakePart) {
+        this.disabledTakePart = disabledTakePart;
     }
 
     public List<Integer> getRemovedDeadlineIds() {

src/main/java/ru/ulstu/conference/service/ConferenceService.java

@@ -100,6 +100,7 @@ public class ConferenceService {
 
     public void takePart(ConferenceDto conferenceDto) throws IOException {
         conferenceDto.getUsers().add(new ConferenceUser(userService.getCurrentUser()));
+        conferenceDto.setDisabledTakePart(true);
     }
 
     public List<Paper> getConferencePapers(List<Integer> paperIds) {
@@ -132,4 +133,12 @@ public class ConferenceService {
     }
 
 
+    public boolean isCurrentUserParticipant(List<ConferenceUser> conferenceUsers) {
+        for (ConferenceUser participant : conferenceUsers) {
+            if (participant.getUser().getId() == userService.getCurrentUser().getId()) {
+                return true;
+            }
+        }
+        return false;
+    }
 }

src/main/resources/public/css/conference.css

@@ -71,6 +71,16 @@ body {
     border-right: 1px solid #ced4da;
 }
 
+#take-part[disabled=disabled] {
+    background-color: #ced4da;
+    border-color: #c2c5c7;
+}
+
+#take-part[disabled=disabled]:hover {
+    background-color: #737475 !important;
+    border-color: #5d5e5f !important;
+}
+
 
 .paper-list {
     height: 200px;

src/main/resources/templates/conferences/conference.html

@@ -122,8 +122,10 @@
                                 </div>
 
                                 <div class="form-group d-flex justify-content-end">
+                                    <input type="hidden" th:value="*{disabledTakePart}" th:name="disabledTakePart"/>
                                     <input id="take-part" class="btn btn-primary"
-                                           type="submit" name="takePart" value="Принять участие"/>
+                                           type="submit" name="takePart" value="Принять участие"
+                                           th:disabled="*{disabledTakePart}"/>
                                 </div>
 
                                 <div class="form-group">