@angular/core
Version:
Angular - the core framework
133 lines • 19.9 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 { assertDefined, assertEqual } from '../../util/assert';
import { assertLContainerOrUndefined } from '../assert';
import { ACTIVE_INDEX, CONTAINER_HEADER_OFFSET } from '../interfaces/container';
import { FLAGS, PARENT, QUERIES, TVIEW, T_HOST } from '../interfaces/view';
import { assertNodeType } from '../node_assert';
import { insertView, removeView } from '../node_manipulation';
import { enterView, getIsParent, getLView, getPreviousOrParentTNode, isCreationMode, leaveView, setIsParent, setPreviousOrParentTNode } from '../state';
import { resetPreOrderHookFlags } from '../util/view_utils';
import { assignTViewNodeToLView, createLView, createTView, refreshDescendantViews } from './shared';
/**
* Marks the start of an embedded view.
*
* @param viewBlockId The ID of this view
* @return boolean Whether or not this view is in creation mode
*
* @codeGenApi
*/
export function ɵɵembeddedViewStart(viewBlockId, consts, vars) {
var lView = getLView();
var previousOrParentTNode = getPreviousOrParentTNode();
// The previous node can be a view node if we are processing an inline for loop
var containerTNode = previousOrParentTNode.type === 2 /* View */ ?
previousOrParentTNode.parent :
previousOrParentTNode;
var lContainer = lView[containerTNode.index];
ngDevMode && assertNodeType(containerTNode, 0 /* Container */);
var viewToRender = scanForView(lContainer, lContainer[ACTIVE_INDEX], viewBlockId);
if (viewToRender) {
setIsParent();
enterView(viewToRender, viewToRender[TVIEW].node);
}
else {
// When we create a new LView, we always reset the state of the instructions.
viewToRender = createLView(lView, getOrCreateEmbeddedTView(viewBlockId, consts, vars, containerTNode), null, 16 /* CheckAlways */, null, null);
if (lContainer[QUERIES]) {
viewToRender[QUERIES] = lContainer[QUERIES].createView();
}
var tParentNode = getIsParent() ? previousOrParentTNode :
previousOrParentTNode && previousOrParentTNode.parent;
assignTViewNodeToLView(viewToRender[TVIEW], tParentNode, viewBlockId, viewToRender);
enterView(viewToRender, viewToRender[TVIEW].node);
}
if (lContainer) {
if (isCreationMode(viewToRender)) {
// it is a new view, insert it into collection of views for a given container
insertView(viewToRender, lContainer, lContainer[ACTIVE_INDEX]);
}
lContainer[ACTIVE_INDEX]++;
}
return isCreationMode(viewToRender) ? 1 /* Create */ | 2 /* Update */ :
2 /* Update */;
}
/**
* Initialize the TView (e.g. static data) for the active embedded view.
*
* Each embedded view block must create or retrieve its own TView. Otherwise, the embedded view's
* static data for a particular node would overwrite the static data for a node in the view above
* it with the same index (since it's in the same template).
*
* @param viewIndex The index of the TView in TNode.tViews
* @param consts The number of nodes, local refs, and pipes in this template
* @param vars The number of bindings and pure function bindings in this template
* @param container The parent container in which to look for the view's static data
* @returns TView
*/
function getOrCreateEmbeddedTView(viewIndex, consts, vars, parent) {
var tView = getLView()[TVIEW];
ngDevMode && assertNodeType(parent, 0 /* Container */);
var containerTViews = parent.tViews;
ngDevMode && assertDefined(containerTViews, 'TView expected');
ngDevMode && assertEqual(Array.isArray(containerTViews), true, 'TViews should be in an array');
if (viewIndex >= containerTViews.length || containerTViews[viewIndex] == null) {
containerTViews[viewIndex] = createTView(viewIndex, null, consts, vars, tView.directiveRegistry, tView.pipeRegistry, null, null);
}
return containerTViews[viewIndex];
}
/**
* Looks for a view with a given view block id inside a provided LContainer.
* Removes views that need to be deleted in the process.
*
* @param lContainer to search for views
* @param startIdx starting index in the views array to search from
* @param viewBlockId exact view block id to look for
*/
function scanForView(lContainer, startIdx, viewBlockId) {
for (var i = startIdx + CONTAINER_HEADER_OFFSET; i < lContainer.length; i++) {
var viewAtPositionId = lContainer[i][TVIEW].id;
if (viewAtPositionId === viewBlockId) {
return lContainer[i];
}
else if (viewAtPositionId < viewBlockId) {
// found a view that should not be at this position - remove
removeView(lContainer, i - CONTAINER_HEADER_OFFSET);
}
else {
// found a view with id greater than the one we are searching for
// which means that required view doesn't exist and can't be found at
// later positions in the views array - stop the searchdef.cont here
break;
}
}
return null;
}
/**
* Marks the end of an embedded view.
*
* @codeGenApi
*/
export function ɵɵembeddedViewEnd() {
var lView = getLView();
var viewHost = lView[T_HOST];
if (isCreationMode(lView)) {
refreshDescendantViews(lView); // creation mode pass
lView[FLAGS] &= ~4 /* CreationMode */;
}
resetPreOrderHookFlags(lView);
refreshDescendantViews(lView); // update mode pass
var lContainer = lView[PARENT];
ngDevMode && assertLContainerOrUndefined(lContainer);
// It's always safe to run hooks here, as `leaveView` is not called during the 'finally' block
// of a try-catch-finally statement, so it can never be reached while unwinding the stack due to
// an error being thrown.
leaveView(lContainer[PARENT], /* safeToRunHooks */ true);
setPreviousOrParentTNode(viewHost, false);
}
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All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {assertDefined, assertEqual} from '../../util/assert';\nimport {assertLContainerOrUndefined} from '../assert';\nimport {ACTIVE_INDEX, CONTAINER_HEADER_OFFSET, LContainer} from '../interfaces/container';\nimport {RenderFlags} from '../interfaces/definition';\nimport {TContainerNode, TNodeType} from '../interfaces/node';\nimport {FLAGS, LView, LViewFlags, PARENT, QUERIES, TVIEW, TView, T_HOST} from '../interfaces/view';\nimport {assertNodeType} from '../node_assert';\nimport {insertView, removeView} from '../node_manipulation';\nimport {enterView, getIsParent, getLView, getPreviousOrParentTNode, isCreationMode, leaveView, setIsParent, setPreviousOrParentTNode} from '../state';\nimport {resetPreOrderHookFlags} from '../util/view_utils';\nimport {assignTViewNodeToLView, createLView, createTView, refreshDescendantViews} from './shared';\n\n/**\n * Marks the start of an embedded view.\n *\n * @param viewBlockId The ID of this view\n * @return boolean Whether or not this view is in creation mode\n *\n * @codeGenApi\n */\nexport function ɵɵembeddedViewStart(\n    viewBlockId: number, consts: number, vars: number): RenderFlags {\n  const lView = getLView();\n  const previousOrParentTNode = getPreviousOrParentTNode();\n  // The previous node can be a view node if we are processing an inline for loop\n  const containerTNode = previousOrParentTNode.type === TNodeType.View ?\n      previousOrParentTNode.parent ! :\n      previousOrParentTNode;\n  const lContainer = lView[containerTNode.index] as LContainer;\n\n  ngDevMode && assertNodeType(containerTNode, TNodeType.Container);\n  let viewToRender = scanForView(lContainer, lContainer[ACTIVE_INDEX] !, viewBlockId);\n\n  if (viewToRender) {\n    setIsParent();\n    enterView(viewToRender, viewToRender[TVIEW].node);\n  } else {\n    // When we create a new LView, we always reset the state of the instructions.\n    viewToRender = createLView(\n        lView,\n        getOrCreateEmbeddedTView(viewBlockId, consts, vars, containerTNode as TContainerNode), null,\n        LViewFlags.CheckAlways, null, null);\n\n    if (lContainer[QUERIES]) {\n      viewToRender[QUERIES] = lContainer[QUERIES] !.createView();\n    }\n\n    const tParentNode = getIsParent() ? previousOrParentTNode :\n                                        previousOrParentTNode && previousOrParentTNode.parent;\n    assignTViewNodeToLView(viewToRender[TVIEW], tParentNode, viewBlockId, viewToRender);\n    enterView(viewToRender, viewToRender[TVIEW].node);\n  }\n  if (lContainer) {\n    if (isCreationMode(viewToRender)) {\n      // it is a new view, insert it into collection of views for a given container\n      insertView(viewToRender, lContainer, lContainer[ACTIVE_INDEX] !);\n    }\n    lContainer[ACTIVE_INDEX] !++;\n  }\n  return isCreationMode(viewToRender) ? RenderFlags.Create | RenderFlags.Update :\n                                        RenderFlags.Update;\n}\n\n/**\n * Initialize the TView (e.g. static data) for the active embedded view.\n *\n * Each embedded view block must create or retrieve its own TView. Otherwise, the embedded view's\n * static data for a particular node would overwrite the static data for a node in the view above\n * it with the same index (since it's in the same template).\n *\n * @param viewIndex The index of the TView in TNode.tViews\n * @param consts The number of nodes, local refs, and pipes in this template\n * @param vars The number of bindings and pure function bindings in this template\n * @param container The parent container in which to look for the view's static data\n * @returns TView\n */\nfunction getOrCreateEmbeddedTView(\n    viewIndex: number, consts: number, vars: number, parent: TContainerNode): TView {\n  const tView = getLView()[TVIEW];\n  ngDevMode && assertNodeType(parent, TNodeType.Container);\n  const containerTViews = parent.tViews as TView[];\n  ngDevMode && assertDefined(containerTViews, 'TView expected');\n  ngDevMode && assertEqual(Array.isArray(containerTViews), true, 'TViews should be in an array');\n  if (viewIndex >= containerTViews.length || containerTViews[viewIndex] == null) {\n    containerTViews[viewIndex] = createTView(\n        viewIndex, null, consts, vars, tView.directiveRegistry, tView.pipeRegistry, null, null);\n  }\n  return containerTViews[viewIndex];\n}\n\n\n/**\n * Looks for a view with a given view block id inside a provided LContainer.\n * Removes views that need to be deleted in the process.\n *\n * @param lContainer to search for views\n * @param startIdx starting index in the views array to search from\n * @param viewBlockId exact view block id to look for\n */\nfunction scanForView(lContainer: LContainer, startIdx: number, viewBlockId: number): LView|null {\n  for (let i = startIdx + CONTAINER_HEADER_OFFSET; i < lContainer.length; i++) {\n    const viewAtPositionId = lContainer[i][TVIEW].id;\n    if (viewAtPositionId === viewBlockId) {\n      return lContainer[i];\n    } else if (viewAtPositionId < viewBlockId) {\n      // found a view that should not be at this position - remove\n      removeView(lContainer, i - CONTAINER_HEADER_OFFSET);\n    } else {\n      // found a view with id greater than the one we are searching for\n      // which means that required view doesn't exist and can't be found at\n      // later positions in the views array - stop the searchdef.cont here\n      break;\n    }\n  }\n  return null;\n}\n\n/**\n * Marks the end of an embedded view.\n *\n * @codeGenApi\n */\nexport function ɵɵembeddedViewEnd(): void {\n  const lView = getLView();\n  const viewHost = lView[T_HOST];\n\n  if (isCreationMode(lView)) {\n    refreshDescendantViews(lView);  // creation mode pass\n    lView[FLAGS] &= ~LViewFlags.CreationMode;\n  }\n  resetPreOrderHookFlags(lView);\n  refreshDescendantViews(lView);  // update mode pass\n  const lContainer = lView[PARENT] as LContainer;\n  ngDevMode && assertLContainerOrUndefined(lContainer);\n  // It's always safe to run hooks here, as `leaveView` is not called during the 'finally' block\n  // of a try-catch-finally statement, so it can never be reached while unwinding the stack due to\n  // an error being thrown.\n  leaveView(lContainer[PARENT] !, /* safeToRunHooks */ true);\n  setPreviousOrParentTNode(viewHost !, false);\n}\n"]}