add IPC touch support and fix some issue

Assets/Prefab/DropdownText.prefab

@@ -11,7 +11,8 @@ GameObject:
   - component: {fileID: 4545477537435998766}
   - component: {fileID: 4914134492775180718}
   - component: {fileID: 840120427923841567}
-  m_Layer: 5
+  - component: {fileID: 997211777649122344}
+  m_Layer: 7
   m_Name: DropdownText
   m_TagString: Untagged
   m_Icon: {fileID: 0}
@@ -131,12 +132,24 @@ MonoBehaviour:
   m_VertexBufferAutoSizeReduction: 0
   m_useMaxVisibleDescender: 1
   m_pageToDisplay: 1
-  m_margin: {x: 0, y: 0, z: 0, w: 18.424858}
+  m_margin: {x: 0, y: 0, z: 0, w: 0}
   m_isUsingLegacyAnimationComponent: 0
   m_isVolumetricText: 0
   m_hasFontAssetChanged: 0
   m_baseMaterial: {fileID: 0}
   m_maskOffset: {x: 0, y: 0, z: 0, w: 0}
+--- !u!225 &997211777649122344
+CanvasGroup:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 5644598695143456032}
+  m_Enabled: 1
+  m_Alpha: 1
+  m_Interactable: 0
+  m_BlocksRaycasts: 0
+  m_IgnoreParentGroups: 0
 --- !u!1 &6563380805594740093
 GameObject:
   m_ObjectHideFlags: 0
@@ -1063,6 +1076,7 @@ GameObject:
   - component: {fileID: 6563380807134184745}
   - component: {fileID: 6563380807134184742}
   - component: {fileID: 6563380807134184743}
+  - component: {fileID: 6673326241402848025}
   m_Layer: 5
   m_Name: Dropdown
   m_TagString: Untagged
@@ -1195,6 +1209,18 @@ MonoBehaviour:
     m_PersistentCalls:
       m_Calls: []
   m_AlphaFadeSpeed: 0.15
+--- !u!225 &6673326241402848025
+CanvasGroup:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 6563380807134184741}
+  m_Enabled: 1
+  m_Alpha: 1
+  m_Interactable: 1
+  m_BlocksRaycasts: 1
+  m_IgnoreParentGroups: 1
 --- !u!1 &6563380807346052300
 GameObject:
   m_ObjectHideFlags: 0