feat(gui): 为GUI提供更多方法 (#10)

* feat(gui): 为GUI提供更多方法

* feat(gui): 修复翻页按钮消失的bug

base/gui/src/main/java/cc/carm/lib/easyplugin/gui/GUI.java

@@ -81,6 +81,19 @@ public class GUI {
         }
     }
 
+    /**
+     * 设置GUI上方(箱子部分)
+     * @param row 行数，1为第1行
+     * @param column 列数，1为第1列
+     * @param item GUIItem
+     */
+    public void setItem(int row, int column, @NotNull GUIItem item){
+        if(row <= 0 || column <= 0) throw new IllegalArgumentException("行数和列数都不能小于等于零");
+        if(row > type.getLines()) throw new IllegalArgumentException("行数("+row+")大于GUI大小限制("+type.getLines()+")");
+        if(column > 9) throw new IllegalArgumentException("列数("+column+")不能大于9");
+        setItem(9*(row-1)+column-1, item);
+    }
+
     public GUIItem getItem(int index) {
         return this.items.get(index);
     }

base/gui/src/main/java/cc/carm/lib/easyplugin/gui/paged/AutoPagedGUI.java

@@ -77,7 +77,14 @@ public class AutoPagedGUI extends CommonPagedGUI {
     public void openGUI(Player user) {
         if (previousPageSlot >= 0) {
             if (hasPreviousPage()) {
-                setItem(previousPageSlot, new GUIItem(Optional.ofNullable(defaultPreviousPage).map(d -> d.apply(user)).orElse(previousPageUI)) {
+                ItemStack finalPreviousPageUI;
+                if(previousPageUI != null)
+                    finalPreviousPageUI = previousPageUI;
+                else if (defaultPreviousPage != null)
+                    finalPreviousPageUI = defaultPreviousPage.apply(user);
+                else
+                    finalPreviousPageUI = null;
+                setItem(previousPageSlot, new GUIItem(finalPreviousPageUI) {
                     @Override
                     public void onClick(Player clicker, ClickType type) {
                         if (type == ClickType.RIGHT) {
@@ -95,7 +102,14 @@ public class AutoPagedGUI extends CommonPagedGUI {
 
         if (nextPageSlot >= 0) {
             if (hasNextPage()) {
-                setItem(nextPageSlot, new GUIItem(Optional.ofNullable(defaultNextPage).map(d -> d.apply(user)).orElse(nextPageUI)) {
+                ItemStack finalNextPageUI;
+                if(previousPageUI != null)
+                    finalNextPageUI = nextPageUI;
+                else if (defaultNextPage != null)
+                    finalNextPageUI = defaultNextPage.apply(user);
+                else
+                    finalNextPageUI = null;
+                setItem(nextPageSlot, new GUIItem(finalNextPageUI) {
                     @Override
                     public void onClick(Player clicker, ClickType type) {
                         if (type == ClickType.RIGHT) {

base/gui/src/main/java/cc/carm/lib/easyplugin/gui/paged/CommonPagedGUI.java

@@ -101,6 +101,8 @@ public class CommonPagedGUI extends PagedGUI {
             super.openGUI(player);
             return;
         }
+        if(page > getLastPageNumber())
+            page = getLastPageNumber();
         List<GUIItem> list = new ArrayList<>();
         int start = (page - 1) * range.length;
         for (int i = start; i < start + range.length; i++) {

base/gui/src/main/java/cc/carm/lib/easyplugin/gui/paged/PagedGUI.java

@@ -20,7 +20,7 @@ public abstract class PagedGUI extends GUI {
     }
 
     public int setCurrentPage(int page) {
-        this.page = Math.max(1, Math.min(page, getLastPageNumber()));
+        this.page = Math.max(1, page);
         return this.page;
     }