84 lines
1.7 KiB
TypeScript
84 lines
1.7 KiB
TypeScript
// (C) Copyright 2015 Moodle Pty Ltd.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
/**
|
|
* Wrapper class to control the interactivity of an element.
|
|
*/
|
|
export abstract class ElementController {
|
|
|
|
protected enabled: boolean;
|
|
protected destroyed = false;
|
|
|
|
constructor(enabled: boolean) {
|
|
this.enabled = enabled;
|
|
}
|
|
|
|
/**
|
|
* Enable element.
|
|
*/
|
|
enable(): void {
|
|
if (this.enabled) {
|
|
return;
|
|
}
|
|
|
|
this.enabled = true;
|
|
|
|
this.onEnabled();
|
|
}
|
|
|
|
/**
|
|
* Disable element.
|
|
*/
|
|
disable(): void {
|
|
if (!this.enabled) {
|
|
return;
|
|
}
|
|
|
|
this.enabled = false;
|
|
|
|
this.onDisabled();
|
|
}
|
|
|
|
/**
|
|
* Destroy the element.
|
|
*/
|
|
destroy(): void {
|
|
if (this.destroyed) {
|
|
return;
|
|
}
|
|
|
|
this.destroyed = true;
|
|
|
|
this.onDestroy();
|
|
}
|
|
|
|
/**
|
|
* Update underlying element to enable interactivity.
|
|
*/
|
|
abstract onEnabled(): void;
|
|
|
|
/**
|
|
* Update underlying element to disable interactivity.
|
|
*/
|
|
abstract onDisabled(): void;
|
|
|
|
/**
|
|
* Destroy/dispose pertinent data.
|
|
*/
|
|
onDestroy(): void {
|
|
// By default, nothing to destroy.
|
|
}
|
|
|
|
}
|