From 23ca665d190bcda11f1db12de0e110916f66422f Mon Sep 17 00:00:00 2001
From: hongweipeng <hongweichen8888@sina.com>
Date: Thu, 10 Dec 2020 00:14:30 +0800
Subject: [PATCH] =?UTF-8?q?anchor=E9=94=9A=E7=82=B9=E9=93=BE=E6=8E=A5?=
 =?UTF-8?q?=E6=94=AF=E6=8C=81=E8=AE=BE=E7=BD=AE=E5=81=8F=E7=A7=BB=E9=87=8F?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 Plugin.php | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/Plugin.php b/Plugin.php
index 53e49f2..97ded40 100644
--- a/Plugin.php
+++ b/Plugin.php
@@ -66,6 +66,9 @@ class MenuTree_Plugin implements Typecho_Plugin_Interface {
         ), 0, _t('文章无标题时隐藏'), _t('文章中无h1、h2、h3...时隐藏'));
         $form->addInput($hidden_set->addRule('enum', _t('必须选择一个模式'), array(0, 1)));
 
+        $anchor_offset = new Typecho_Widget_Helper_Form_Element_Text('anchor_offset', NULL, '0', _t('标题链接偏移量(单位 em)'), _t('填入数字，支持负数'));
+        $form->addInput($anchor_offset);
+
     }
 
     /**
@@ -138,7 +141,7 @@ class MenuTree_Plugin implements Typecho_Plugin_Interface {
             }
         }
         self::$id++;
-        return "<span id=\"{$menu['id']}\" name=\"{$menu['id']}\"></span>" . $html;
+        return "<span id=\"{$menu['id']}\" class=\"anchor\" name=\"{$menu['id']}\"></span>" . $html;
     }
     
     /**
@@ -203,7 +206,19 @@ class MenuTree_Plugin implements Typecho_Plugin_Interface {
             return;
         }
         $cssUrl = Helper::options()->pluginUrl . '/MenuTree/menutree.css?v=' . self::$v;
-        echo '<link rel="stylesheet" type="text/css" href="' . $cssUrl . '" />';
+        $anchor_offset = Helper::options()->plugin('MenuTree')->anchor_offset;
+
+        echo <<<EOF
+<link rel="stylesheet" type="text/css" href="{$cssUrl}" />
+<style>
+span.anchor {
+    display: block;
+    position: relative;
+    top: {$anchor_offset}em;
+    visibility: hidden;
+}
+</style>
+EOF;
     }
 
     /**