posmenu show condition

XdCxRhDW.App/ExtensionsDev/MapControlEx.cs

@@ -379,7 +379,7 @@ public static class MapControlEx
     /// <param name="img"></param>
     /// <param name="action">一个回调,参数为选中的定位点</param>
     /// <returns></returns>
-    public static MapControl AddPosMenu<T>(this MapControl ctrl, string caption, SvgImage img, Action<T> action) where T : PosData, new()
+    public static MapControl AddPosMenu<T>(this MapControl ctrl, string caption, SvgImage img, Action<T> action, Func<T, bool> showCondition = null) where T : PosData, new()
     {
         var btnCustom = new BarButtonItem() { Caption = caption };
         btnCustom.ImageOptions.SvgImage = img;
@@ -394,6 +394,20 @@ public static class MapControlEx
 
         innerData.posMenu.LinksPersistInfo.Add(new LinkPersistInfo(btnCustom));
         innerData.barM.EndInit();
+        innerData.posMenu.BeforePopup += (sender, e) =>
+        {
+            if (showCondition == null)
+                btnCustom.Visibility = BarItemVisibility.Always;
+            else
+            {
+                bool showBtn = showCondition((T)innerData.preSelectedItem.Tag);
+                if (showBtn)
+                    btnCustom.Visibility = BarItemVisibility.Always;
+                else
+                    btnCustom.Visibility = BarItemVisibility.Never;
+            }
+                
+        };
         return ctrl;
     }
 
@@ -796,7 +810,7 @@ public static class MapControlEx
         var btnHJ = new BarButtonItem() { Caption = "航迹" };
         btnHJ.ImageOptions.SvgImage = SvgHelper.CreateMarkDot();
         btnHJ.Tag = ctrl;
-       
+
         var innerData = ctrl.Tag as InnerData;
         innerData.onClickChanged = onClickChanged;
         btnHJ.ItemClick += (sender, e) =>
@@ -836,7 +850,7 @@ public static class MapControlEx
             Size = _dotSize,
             Tag = item,
             Location = new GeoPoint(item.PosLat, item.PosLon),
-            ToolTipPattern="dd"
+            ToolTipPattern = "dd"
         };
         innerData.mMapStorage.Items.Add(mapItem);
 
@@ -1356,7 +1370,7 @@ public static class MapControlEx
             Visible = true,
             IsHitTestVisible = true,
             Tag = $"{identify}{title}",
-            ToolTipPattern= title,
+            ToolTipPattern = title,
 
         };
         foreach (var item in lines)
@@ -1561,15 +1575,15 @@ public static class MapControlEx
 
         return (c_lng, c_lat);  //方向上的另一点坐标
     }
-    
-/**
-* 求B点经纬度
-* @param A 已知点的经纬度，
-* @param distance   AB两地的距离  单位km
-* @param angle  AB连线与正北方向的夹角（0~360）
-* @return  B点的经纬度
+
+    /**
+    * 求B点经纬度
+    * @param A 已知点的经纬度，
+    * @param distance   AB两地的距离  单位km
+    * @param angle  AB连线与正北方向的夹角（0~360）
+    * @return  B点的经纬度
 */
-private static MyLatLng getMyLatLng(MyLatLng A, double distance, double angle)
+    private static MyLatLng getMyLatLng(MyLatLng A, double distance, double angle)
     {
         double dx = distance * 1000 * Math.Sin(DegreesToRadians(angle));
         double dy = distance * 1000 * Math.Cos(DegreesToRadians(angle));