From b87bacf74a20ee0989c0405b80e2b8699b905064 Mon Sep 17 00:00:00 2001
From: teach <teachliang@can-dao.com>
Date: Sat, 12 Oct 2019 10:45:20 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=E7=82=B9=E5=87=BB=E6=A0=87?=
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---
 .../com/donkingliang/labels/LabelsView.java   | 45 +++++++++++++++++--
 1 file changed, 41 insertions(+), 4 deletions(-)

diff --git a/labels/src/main/java/com/donkingliang/labels/LabelsView.java b/labels/src/main/java/com/donkingliang/labels/LabelsView.java
index 166fdb1..1fe6686 100644
--- a/labels/src/main/java/com/donkingliang/labels/LabelsView.java
+++ b/labels/src/main/java/com/donkingliang/labels/LabelsView.java
@@ -56,6 +56,7 @@ public class LabelsView extends ViewGroup implements View.OnClickListener {
 
     private OnLabelClickListener mLabelClickListener;
     private OnLabelSelectChangeListener mLabelSelectChangeListener;
+    private OnSelectChangeIntercept mOnSelectChangeIntercept;
 
     /**
      * Label的选择类型
@@ -567,16 +568,20 @@ public void onClick(View v) {
                         boolean irrevocable = mSelectType == SelectType.MULTI && mCompulsorys.contains((Integer) label.getTag(KEY_POSITION));
                         irrevocable = irrevocable || (mSelectType == SelectType.MULTI && mSelectLabels.size() <= mMinSelect);
                         irrevocable = irrevocable || mSelectType == SelectType.SINGLE_IRREVOCABLY;
-                        if (!irrevocable) {
+                        if (!irrevocable&& !selectChangeIntercept(label)) {
                             setLabelSelect(label, false);
                         }
                     } else {
                         if (mSelectType == SelectType.SINGLE || mSelectType == SelectType.SINGLE_IRREVOCABLY) {
-                            innerClearAllSelect();
-                            setLabelSelect(label, true);
+                            if (!selectChangeIntercept(label)) {
+                                innerClearAllSelect();
+                                setLabelSelect(label, true);
+                            }
                         } else if (mSelectType == SelectType.MULTI
                                 && (mMaxSelect <= 0 || mMaxSelect > mSelectLabels.size())) {
-                            setLabelSelect(label, true);
+                            if (!selectChangeIntercept(label)) {
+                                setLabelSelect(label, true);
+                            }
                         }
                     }
                 }
@@ -603,6 +608,12 @@ private void setLabelSelect(TextView label, boolean isSelect) {
         }
     }
 
+    private boolean selectChangeIntercept(TextView label) {
+        return mOnSelectChangeIntercept != null && mOnSelectChangeIntercept.onIntercept(label,
+                label.getTag(KEY_DATA), label.isSelected(), !label.isSelected(),
+                (int) label.getTag(KEY_POSITION));
+    }
+
     /**
      * 取消所有选中的label
      */
@@ -1056,6 +1067,15 @@ public void setOnLabelSelectChangeListener(OnLabelSelectChangeListener l) {
         mLabelSelectChangeListener = l;
     }
 
+    /**
+     * 设置标签选中状态的点击改变拦截器
+     *
+     * @param intercept
+     */
+    public void setOnSelectChangeIntercept(OnSelectChangeIntercept intercept) {
+        mOnSelectChangeIntercept = intercept;
+    }
+
     /**
      * sp转px
      */
@@ -1093,6 +1113,23 @@ public interface OnLabelSelectChangeListener {
         void onLabelSelectChange(TextView label, Object data, boolean isSelect, int position);
     }
 
+    /**
+     * 点击选中/取消选中时，拦截事件，返回true时，表示事件被拦截，不会改变标签的选中状态。
+     * 当希望某个标签在特定条件下不被选中/取消选中时，可以使用事件拦截。
+     * 只有用户点击改变标签选中状态时才会回调拦截，用其他方法改变时不会回调这个方法，不会被拦截。
+     */
+    public interface OnSelectChangeIntercept {
+
+        /**
+         * @param label     标签
+         * @param data      标签对应的数据
+         * @param oldSelect 旧选中状态
+         * @param newSelect 新选中状态
+         * @param position  标签位置
+         */
+        boolean onIntercept(TextView label, Object data, boolean oldSelect, boolean newSelect, int position);
+    }
+
     /**
      * 给标签提供最终需要显示的数据。因为LabelsView的列表可以设置任何类型的数据，而LabelsView里的每个item的是一
      * 个TextView，只能显示CharSequence的数据，所以LabelTextProvider需要根据每个item的数据返回item最终要显示