Unity編輯器搜尋風格輸入框

效果如下

沒輸入的時候


有輸入的時候

        private GUIStyle TextFieldRoundEdge;
        private GUIStyle TextFieldRoundEdgeCancelButton;
        private GUIStyle TextFieldRoundEdgeCancelButtonEmpty;
        private GUIStyle TransparentTextField;
        /// <summary>
        /// 繪製輸入框，放在OnGUI函式裡
 

        /// </summary>
        private void DrawInputTextField()
        {
            if (TextFieldRoundEdge == null)
            {
                TextFieldRoundEdge = new GUIStyle("SearchTextField");
                TextFieldRoundEdgeCancelButton = new GUIStyle("SearchCancelButton");
                TextFieldRoundEdgeCancelButtonEmpty = new
 
 GUIStyle("SearchCancelButtonEmpty");
                TransparentTextField = new GUIStyle(EditorStyles.whiteLabel);
                TransparentTextField.normal.textColor = EditorStyles.textField.normal.textColor;
            }

            //獲取當前輸入框的Rect(位置大小)
            Rect position = EditorGUILayout.GetControlRect();
            //設定圓角style的GUIStyle
 

            GUIStyle textFieldRoundEdge = TextFieldRoundEdge;
            //設定輸入框的GUIStyle為透明，所以看到的“輸入框”是TextFieldRoundEdge的風格
            GUIStyle transparentTextField = TransparentTextField;
            //選擇取消按鈕(x)的GUIStyle
            GUIStyle gUIStyle = (m_InputSearchText != "") ? TextFieldRoundEdgeCancelButton : TextFieldRoundEdgeCancelButtonEmpty;

            //輸入框的水平位置向左移動取消按鈕寬度的距離
            position.width -= gUIStyle.fixedWidth;
            //如果面板重繪
            if (Event.current.type == EventType.Repaint)
            {
                //根據是否是專業版來選取顏色
                GUI.contentColor = (EditorGUIUtility.isProSkin ? Color.black : new Color(0f, 0f, 0f, 0.5f));
                //當沒有輸入的時候提示“請輸入”
                if (string.IsNullOrEmpty(m_InputSearchText))
                {
                    textFieldRoundEdge.Draw(position, new GUIContent("請輸入"), 0);
                }
                else
                {
                    textFieldRoundEdge.Draw(position, new GUIContent(""), 0);
                }
                //因為是“全域性變數”，用完要重置回來
                GUI.contentColor = Color.white;
            }
            Rect rect = position;
            //為了空出左邊那個放大鏡的位置
            float num = textFieldRoundEdge.CalcSize(new GUIContent("")).x - 2f;
            rect.width -= num;
            rect.x += num;
            rect.y += 1f;//為了和後面的style對其

            m_InputSearchText = EditorGUI.TextField(rect, m_InputSearchText, transparentTextField);
            //繪製取消按鈕，位置要在輸入框右邊
            position.x += position.width;
            position.width = gUIStyle.fixedWidth;
            position.height = gUIStyle.fixedHeight;
            if (GUI.Button(position, GUIContent.none, gUIStyle) && m_InputSearchText != "")
            {
                m_InputSearchText = "";
                //使用者是否做了輸入
                GUI.changed = true;
                //把焦點移開輸入框
                GUIUtility.keyboardControl = 0;
            }           
        }