@kephas/angular
Version:
Provides integration capabilities with Angular.
203 lines • 19.6 kB
JavaScript
import { Input, ElementRef, ViewContainerRef, Component } from '@angular/core';
import { WidgetBase } from '../../public-api';
/**
* Provides a base implementation for value editors.
*
* @export
* @abstract
* @class ValueEditorBase
* @implements {OnInit}
* @implements {AfterViewInit}
* @implements {ControlValueAccessor}
* @template TValue The value type.
*/
export class ValueEditorBase extends WidgetBase {
/**
* Creates an instance of ValueEditorBase.
*
* @param {ElementRef} elementRef The element reference.
* @param {ViewContainerRef} viewContainerRef The view container reference.
* @memberof ValueEditorBase
*/
constructor(elementRef, viewContainerRef) {
super(elementRef, viewContainerRef);
/**
* Gets or sets a value indicating whether the value is changed from the change event.
*
* @protected
* @memberof ValueEditorBase
*/
this.valueChangeFromEvent = false;
/**
* Gets or sets a value indicating whether the value is changed from the value property.
*
* @protected
* @memberof ValueEditorBase
*/
this.valueChangeFromValue = false;
this._onChange = (_) => {
// The implementation will get overwritten by Angular in RegisterOnChange.
};
this._onTouched = () => {
// The implementation will get overwritten by Angular in RegisterOnTouched.
};
}
/**
* Gets or sets the value to edit.
*
* @type {TValue}
* @memberOf ValueEditorBase
*/
get value() {
return this.getEditorValue();
}
set value(value) {
if (this._valueBeforeChange === value) {
return;
}
this.updateEditor(value);
}
/**
* Updates the underlying editor with the provided value.
*
* @protected
* @param {TValue} value
* @returns {boolean}
* @memberof ValueEditorBase
*/
updateEditor(value) {
if (this.valueChangeFromValue) {
return false;
}
const prevValueChangeFromValue = this.valueChangeFromValue;
this.valueChangeFromValue = true;
try {
const oldValue = this._valueBeforeChange;
this.onValueChanging(oldValue, value);
this._valueBeforeChange = value;
if (!this.valueChangeFromEvent) {
this.setEditorValue(value);
value = this.getEditorValue();
}
this.onValueChanged(oldValue, value);
}
catch (error) {
this.logger.error(error, 'Error while updating the editor.');
throw error;
}
finally {
this.valueChangeFromValue = prevValueChangeFromValue;
}
return true;
}
/**
* Overridable method invoked when the value is about to be changed.
*
* @protected
* @param {(TValue | undefined)} oldValue The old value.
* @param {(TValue | undefined)} newValue The new value.
* @memberof ValueEditorBase
*/
onValueChanging(oldValue, newValue) {
}
/**
* Overridable method invoked after the value was changed.
*
* @protected
* @param {(TValue | undefined)} oldValue The old value.
* @param {(TValue | undefined)} newValue The new value.
* @memberof ValueEditorBase
*/
onValueChanged(oldValue, newValue) {
this._onChange(newValue);
}
/**
* Callback invoked from the change event of the underlying editor.
*
* @protected
* @param {*} e
* @returns
* @memberof PropertyEditorComponent
*/
onEditorChange(e) {
if (this.valueChangeFromValue) {
return;
}
const prevValueChangeFromEvent = this.valueChangeFromEvent;
this.valueChangeFromEvent = true;
try {
const newValue = this.getEditorValueOnChange(e);
this.value = newValue;
}
catch (error) {
this.notification.notifyError(error);
}
finally {
this.valueChangeFromEvent = prevValueChangeFromEvent;
}
}
/**
* Gets the underlying editor's value upon change.
*
* @protected
* @param {*} e The change event arguments.
* @returns {TValue} The widget value.
* @memberof ValueEditorBase
*/
getEditorValueOnChange(e) {
return this.getEditorValue();
}
/**
* Write a new value to the element.
*
* @param {*} obj The new value.
*
* @memberOf PropertyEditorComponent
*/
writeValue(obj) {
this.value = obj;
}
/**
* Set the function to be called when the control receives a change event.
*
* @param {*} fn The callback function.
*
* @memberOf PropertyEditorComponent
*/
registerOnChange(fn) {
this._onChange = fn;
}
/**
* Set the function to be called when the control receives a touch event.
*
* @param {*} fn The callback function.
*
* @memberOf PropertyEditorComponent
*/
registerOnTouched(fn) {
this._onTouched = fn;
}
/**
* This function is called when the control status changes to or from "DISABLED".
* Depending on the value, it will enable or disable the appropriate DOM element.
*
* @param {boolean} isDisabled True if the state is disabled.
*
* @memberOf PropertyEditorComponent
*/
setDisabledState(isDisabled) {
}
}
ValueEditorBase.decorators = [
{ type: Component, args: [{
template: ''
},] }
];
ValueEditorBase.ctorParameters = () => [
{ type: ElementRef },
{ type: ViewContainerRef }
];
ValueEditorBase.propDecorators = {
value: [{ type: Input }]
};
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{\r\n    Input, ElementRef, ViewContainerRef, Component\r\n} from '@angular/core';\r\nimport { ControlValueAccessor } from '@angular/forms';\r\nimport { WidgetBase } from '../../public-api';\r\n\r\n/**\r\n * Provides a base implementation for value editors.\r\n *\r\n * @export\r\n * @abstract\r\n * @class ValueEditorBase\r\n * @implements {OnInit}\r\n * @implements {AfterViewInit}\r\n * @implements {ControlValueAccessor}\r\n * @template TValue The value type.\r\n */\r\n@Component({\r\n  template: ''\r\n})\r\nexport abstract class ValueEditorBase<TValue>\r\n    extends WidgetBase\r\n    implements ControlValueAccessor {\r\n\r\n    /**\r\n     * Gets or sets the value description.\r\n     *\r\n     * @type {string}\r\n     * @memberof ValueEditorBase\r\n     */\r\n    public description?: string;\r\n\r\n    /**\r\n     * Gets or sets the value prompt.\r\n     *\r\n     * @type {string}\r\n     * @memberof ValueEditorBase\r\n     */\r\n    public prompt?: string;\r\n\r\n    /**\r\n     * Gets or sets a value indicating whether the value is changed from the change event.\r\n     *\r\n     * @protected\r\n     * @memberof ValueEditorBase\r\n     */\r\n    protected valueChangeFromEvent = false;\r\n\r\n    /**\r\n     * Gets or sets a value indicating whether the value is changed from the value property.\r\n     *\r\n     * @protected\r\n     * @memberof ValueEditorBase\r\n     */\r\n    protected valueChangeFromValue = false;\r\n\r\n    private _valueBeforeChange?: TValue;\r\n\r\n    /**\r\n     * Creates an instance of ValueEditorBase.\r\n     *\r\n     * @param {ElementRef} elementRef The element reference.\r\n     * @param {ViewContainerRef} viewContainerRef The view container reference.\r\n     * @memberof ValueEditorBase\r\n     */\r\n    constructor(\r\n        elementRef: ElementRef,\r\n        viewContainerRef: ViewContainerRef,\r\n    ) {\r\n        super(elementRef, viewContainerRef);\r\n    }\r\n\r\n    /**\r\n     * Gets or sets the value to edit.\r\n     *\r\n     * @type {TValue}\r\n     * @memberOf ValueEditorBase\r\n     */\r\n    @Input()\r\n    get value(): TValue {\r\n        return this.getEditorValue();\r\n    }\r\n    set value(value: TValue) {\r\n        if (this._valueBeforeChange === value) {\r\n            return;\r\n        }\r\n\r\n        this.updateEditor(value);\r\n    }\r\n\r\n    /**\r\n     * Updates the underlying editor with the provided value.\r\n     *\r\n     * @protected\r\n     * @param {TValue} value\r\n     * @returns {boolean}\r\n     * @memberof ValueEditorBase\r\n     */\r\n    protected updateEditor(value: TValue): boolean {\r\n        if (this.valueChangeFromValue) {\r\n            return false;\r\n        }\r\n\r\n        const prevValueChangeFromValue = this.valueChangeFromValue;\r\n        this.valueChangeFromValue = true;\r\n\r\n        try {\r\n            const oldValue = this._valueBeforeChange;\r\n            this.onValueChanging(oldValue, value);\r\n            this._valueBeforeChange = value;\r\n\r\n            if (!this.valueChangeFromEvent) {\r\n                this.setEditorValue(value);\r\n                value = this.getEditorValue();\r\n            }\r\n\r\n            this.onValueChanged(oldValue, value);\r\n        } catch (error) {\r\n            this.logger.error(error, 'Error while updating the editor.');\r\n            throw error;\r\n        } finally {\r\n            this.valueChangeFromValue = prevValueChangeFromValue;\r\n        }\r\n\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * Overridable method invoked when the value is about to be changed.\r\n     *\r\n     * @protected\r\n     * @param {(TValue | undefined)} oldValue The old value.\r\n     * @param {(TValue | undefined)} newValue The new value.\r\n     * @memberof ValueEditorBase\r\n     */\r\n    protected onValueChanging(oldValue: TValue | undefined, newValue: TValue | undefined): void {\r\n    }\r\n\r\n    /**\r\n     * Overridable method invoked after the value was changed.\r\n     *\r\n     * @protected\r\n     * @param {(TValue | undefined)} oldValue The old value.\r\n     * @param {(TValue | undefined)} newValue The new value.\r\n     * @memberof ValueEditorBase\r\n     */\r\n    protected onValueChanged(oldValue: TValue | undefined, newValue: TValue | undefined): void {\r\n        this._onChange(newValue);\r\n    }\r\n\r\n    /**\r\n     * Callback invoked from the change event of the underlying editor.\r\n     *\r\n     * @protected\r\n     * @param {*} e\r\n     * @returns\r\n     * @memberof PropertyEditorComponent\r\n     */\r\n    protected onEditorChange(e: any) {\r\n        if (this.valueChangeFromValue) {\r\n            return;\r\n        }\r\n\r\n        const prevValueChangeFromEvent = this.valueChangeFromEvent;\r\n        this.valueChangeFromEvent = true;\r\n        try {\r\n            const newValue = this.getEditorValueOnChange(e);\r\n            this.value = newValue;\r\n        } catch (error) {\r\n            this.notification.notifyError(error);\r\n        } finally {\r\n            this.valueChangeFromEvent = prevValueChangeFromEvent;\r\n        }\r\n    }\r\n\r\n    /**\r\n     * Sets the value of the underlying editor.\r\n     *\r\n     * @protected\r\n     * @param {TValue} value The value to be set.\r\n     * @memberof ValueEditorBase\r\n     */\r\n    protected abstract setEditorValue(value: TValue): void;\r\n\r\n    /**\r\n     * Gets the underlying editor's value.\r\n     *\r\n     * @protected\r\n     * @returns {TValue} The widget value.\r\n     * @memberof ValueEditorBase\r\n     */\r\n    protected abstract getEditorValue(): TValue;\r\n\r\n    /**\r\n     * Gets the underlying editor's value upon change.\r\n     *\r\n     * @protected\r\n     * @param {*} e The change event arguments.\r\n     * @returns {TValue} The widget value.\r\n     * @memberof ValueEditorBase\r\n     */\r\n    protected getEditorValueOnChange(e: any): TValue {\r\n        return this.getEditorValue();\r\n    }\r\n\r\n\r\n    /**\r\n     * Write a new value to the element.\r\n     *\r\n     * @param {*} obj The new value.\r\n     *\r\n     * @memberOf PropertyEditorComponent\r\n     */\r\n    writeValue(obj: any): void {\r\n        this.value = obj;\r\n    }\r\n\r\n    /**\r\n     * Set the function to be called when the control receives a change event.\r\n     *\r\n     * @param {*} fn The callback function.\r\n     *\r\n     * @memberOf PropertyEditorComponent\r\n     */\r\n    registerOnChange(fn: any): void {\r\n        this._onChange = fn;\r\n    }\r\n\r\n    /**\r\n     * Set the function to be called when the control receives a touch event.\r\n     *\r\n     * @param {*} fn The callback function.\r\n     *\r\n     * @memberOf PropertyEditorComponent\r\n     */\r\n    registerOnTouched(fn: any): void {\r\n        this._onTouched = fn;\r\n    }\r\n\r\n    /**\r\n     * This function is called when the control status changes to or from \"DISABLED\".\r\n     * Depending on the value, it will enable or disable the appropriate DOM element.\r\n     *\r\n     * @param {boolean} isDisabled True if the state is disabled.\r\n     *\r\n     * @memberOf PropertyEditorComponent\r\n     */\r\n    setDisabledState(isDisabled: boolean): void {\r\n    }\r\n\r\n    private _onChange = (_: any) => {\r\n        // The implementation will get overwritten by Angular in RegisterOnChange.\r\n    };\r\n\r\n    private _onTouched = () => {\r\n        // The implementation will get overwritten by Angular in RegisterOnTouched.\r\n    };\r\n}\r\n"]}