@angular/core
Version:
Angular - the core framework
61 lines • 10.1 kB
JavaScript
/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { devModeEqual } from '../change_detection/change_detection_util';
import { assertDataInRange, assertLessThan, assertNotSame } from '../util/assert';
import { throwErrorIfNoChangesMode } from './errors';
import { getCheckNoChangesMode } from './state';
import { NO_CHANGE } from './tokens';
import { isDifferent } from './util/misc_utils';
// TODO(misko): consider inlining
/** Updates binding and returns the value. */
export function updateBinding(lView, bindingIndex, value) {
return lView[bindingIndex] = value;
}
/** Gets the current binding value. */
export function getBinding(lView, bindingIndex) {
ngDevMode && assertDataInRange(lView, bindingIndex);
ngDevMode &&
assertNotSame(lView[bindingIndex], NO_CHANGE, 'Stored value should never be NO_CHANGE.');
return lView[bindingIndex];
}
/** Updates binding if changed, then returns whether it was updated. */
export function bindingUpdated(lView, bindingIndex, value) {
ngDevMode && assertNotSame(value, NO_CHANGE, 'Incoming value should never be NO_CHANGE.');
ngDevMode &&
assertLessThan(bindingIndex, lView.length, "Slot should have been initialized to NO_CHANGE");
var oldValue = lView[bindingIndex];
if (isDifferent(oldValue, value)) {
if (ngDevMode && getCheckNoChangesMode()) {
// View engine didn't report undefined values as changed on the first checkNoChanges pass
// (before the change detection was run).
var oldValueToCompare = oldValue !== NO_CHANGE ? oldValue : undefined;
if (!devModeEqual(oldValueToCompare, value)) {
throwErrorIfNoChangesMode(oldValue === NO_CHANGE, oldValueToCompare, value);
}
}
lView[bindingIndex] = value;
return true;
}
return false;
}
/** Updates 2 bindings if changed, then returns whether either was updated. */
export function bindingUpdated2(lView, bindingIndex, exp1, exp2) {
var different = bindingUpdated(lView, bindingIndex, exp1);
return bindingUpdated(lView, bindingIndex + 1, exp2) || different;
}
/** Updates 3 bindings if changed, then returns whether any was updated. */
export function bindingUpdated3(lView, bindingIndex, exp1, exp2, exp3) {
var different = bindingUpdated2(lView, bindingIndex, exp1, exp2);
return bindingUpdated(lView, bindingIndex + 2, exp3) || different;
}
/** Updates 4 bindings if changed, then returns whether any was updated. */
export function bindingUpdated4(lView, bindingIndex, exp1, exp2, exp3, exp4) {
var different = bindingUpdated2(lView, bindingIndex, exp1, exp2);
return bindingUpdated2(lView, bindingIndex + 2, exp3, exp4) || different;
}
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