103 lines
3.2 KiB
C#
103 lines
3.2 KiB
C#
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// Copyright 2017 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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using UnityEngine;
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using UnityEngine.UI;
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using UnityEngine.EventSystems;
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using System.Collections;
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/// Dropdown UI component that works with the GvrRaycasters.
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/// This is a workaround for the fact that the Dropdown component doesn't work with custom raycasters
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/// because it internally adds two GraphicRaycasters.
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[HelpURL("https://developers.google.com/vr/unity/reference/class/GvrDropdown")]
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public class GvrDropdown : Dropdown {
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private GameObject currentBlocker;
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public override void OnPointerClick(PointerEventData eventData) {
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base.OnPointerClick(eventData);
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FixTemplateAndBlockerRaycasters();
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}
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public override void OnSubmit(BaseEventData eventData) {
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base.OnSubmit(eventData);
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FixTemplateAndBlockerRaycasters();
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}
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private void FixTemplateAndBlockerRaycasters() {
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if (template != null) {
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FixRaycaster(template.gameObject, false);
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}
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FixRaycaster(currentBlocker, true);
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}
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protected override GameObject CreateBlocker(Canvas rootCanvas) {
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currentBlocker = base.CreateBlocker(rootCanvas);
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return currentBlocker;
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}
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protected override GameObject CreateDropdownList(GameObject template) {
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GameObject dropdown = base.CreateDropdownList(template);
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FixRaycaster(dropdown, false);
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return dropdown;
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}
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private void FixRaycaster(GameObject go, bool shouldCopyProperties) {
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if (go == null) {
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return;
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}
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GraphicRaycaster oldRaycaster = go.GetComponent<GraphicRaycaster>();
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Destroy(oldRaycaster);
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bool addedRaycaster;
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GvrPointerGraphicRaycaster raycaster;
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raycaster = GetOrAddComponent<GvrPointerGraphicRaycaster>(go, out addedRaycaster);
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if (shouldCopyProperties) {
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GvrPointerGraphicRaycaster templateRaycaster = GetTemplateRaycaster();
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if (addedRaycaster && templateRaycaster != null) {
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CopyRaycasterProperties(templateRaycaster, raycaster);
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}
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}
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}
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private GvrPointerGraphicRaycaster GetTemplateRaycaster() {
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if (template == null) {
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return null;
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}
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return template.GetComponent<GvrPointerGraphicRaycaster>();
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}
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private void CopyRaycasterProperties(GvrPointerGraphicRaycaster source, GvrPointerGraphicRaycaster dest) {
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if (source == null || dest == null) {
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return;
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}
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dest.blockingMask = source.blockingMask;
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dest.blockingObjects = source.blockingObjects;
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dest.ignoreReversedGraphics = source.ignoreReversedGraphics;
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}
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private static T GetOrAddComponent<T>(GameObject go, out bool addedComponent) where T : Component {
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T comp = go.GetComponent<T>();
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addedComponent = false;
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if (!comp) {
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comp = go.AddComponent<T>();
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addedComponent = true;
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}
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return comp;
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}
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}
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