@angular/cdk
Version:
Angular Material Component Development Kit
153 lines • 19.7 kB
JavaScript
/**
* @license
* Copyright Google LLC 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 { ConnectionPositionPair, } from './connected-position';
import { FlexibleConnectedPositionStrategy } from './flexible-connected-position-strategy';
/**
* A strategy for positioning overlays. Using this strategy, an overlay is given an
* implicit position relative to some origin element. The relative position is defined in terms of
* a point on the origin element that is connected to a point on the overlay element. For example,
* a basic dropdown is connecting the bottom-left corner of the origin to the top-left corner
* of the overlay.
* @deprecated Use `FlexibleConnectedPositionStrategy` instead.
* @breaking-change 8.0.0
*/
export class ConnectedPositionStrategy {
constructor(originPos, overlayPos, connectedTo, viewportRuler, document, platform, overlayContainer) {
/** Ordered list of preferred positions, from most to least desirable. */
this._preferredPositions = [];
// Since the `ConnectedPositionStrategy` is deprecated and we don't want to maintain
// the extra logic, we create an instance of the positioning strategy that has some
// defaults that make it behave as the old position strategy and to which we'll
// proxy all of the API calls.
this._positionStrategy = new FlexibleConnectedPositionStrategy(connectedTo, viewportRuler, document, platform, overlayContainer)
.withFlexibleDimensions(false)
.withPush(false)
.withViewportMargin(0);
this.withFallbackPosition(originPos, overlayPos);
}
/** Emits an event when the connection point changes. */
get onPositionChange() {
return this._positionStrategy.positionChanges;
}
/** Ordered list of preferred positions, from most to least desirable. */
get positions() {
return this._preferredPositions;
}
/** Attach this position strategy to an overlay. */
attach(overlayRef) {
this._overlayRef = overlayRef;
this._positionStrategy.attach(overlayRef);
if (this._direction) {
overlayRef.setDirection(this._direction);
this._direction = null;
}
}
/** Disposes all resources used by the position strategy. */
dispose() {
this._positionStrategy.dispose();
}
/** @docs-private */
detach() {
this._positionStrategy.detach();
}
/**
* Updates the position of the overlay element, using whichever preferred position relative
* to the origin fits on-screen.
* @docs-private
*/
apply() {
this._positionStrategy.apply();
}
/**
* Re-positions the overlay element with the trigger in its last calculated position,
* even if a position higher in the "preferred positions" list would now fit. This
* allows one to re-align the panel without changing the orientation of the panel.
*/
recalculateLastPosition() {
this._positionStrategy.reapplyLastPosition();
}
/**
* Sets the list of Scrollable containers that host the origin element so that
* on reposition we can evaluate if it or the overlay has been clipped or outside view. Every
* Scrollable must be an ancestor element of the strategy's origin element.
*/
withScrollableContainers(scrollables) {
this._positionStrategy.withScrollableContainers(scrollables);
}
/**
* Adds a new preferred fallback position.
* @param originPos
* @param overlayPos
*/
withFallbackPosition(originPos, overlayPos, offsetX, offsetY) {
const position = new ConnectionPositionPair(originPos, overlayPos, offsetX, offsetY);
this._preferredPositions.push(position);
this._positionStrategy.withPositions(this._preferredPositions);
return this;
}
/**
* Sets the layout direction so the overlay's position can be adjusted to match.
* @param dir New layout direction.
*/
withDirection(dir) {
// Since the direction might be declared before the strategy is attached,
// we save the value in a temporary property and we'll transfer it to the
// overlay ref on attachment.
if (this._overlayRef) {
this._overlayRef.setDirection(dir);
}
else {
this._direction = dir;
}
return this;
}
/**
* Sets an offset for the overlay's connection point on the x-axis
* @param offset New offset in the X axis.
*/
withOffsetX(offset) {
this._positionStrategy.withDefaultOffsetX(offset);
return this;
}
/**
* Sets an offset for the overlay's connection point on the y-axis
* @param offset New offset in the Y axis.
*/
withOffsetY(offset) {
this._positionStrategy.withDefaultOffsetY(offset);
return this;
}
/**
* Sets whether the overlay's position should be locked in after it is positioned
* initially. When an overlay is locked in, it won't attempt to reposition itself
* when the position is re-applied (e.g. when the user scrolls away).
* @param isLocked Whether the overlay should locked in.
*/
withLockedPosition(isLocked) {
this._positionStrategy.withLockedPosition(isLocked);
return this;
}
/**
* Overwrites the current set of positions with an array of new ones.
* @param positions Position pairs to be set on the strategy.
*/
withPositions(positions) {
this._preferredPositions = positions.slice();
this._positionStrategy.withPositions(this._preferredPositions);
return this;
}
/**
* Sets the origin element, relative to which to position the overlay.
* @param origin Reference to the new origin element.
*/
setOrigin(origin) {
this._positionStrategy.setOrigin(origin);
return this;
}
}
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Using this strategy, an overlay is given an\n * implicit position relative to some origin element. The relative position is defined in terms of\n * a point on the origin element that is connected to a point on the overlay element. For example,\n * a basic dropdown is connecting the bottom-left corner of the origin to the top-left corner\n * of the overlay.\n * @deprecated Use `FlexibleConnectedPositionStrategy` instead.\n * @breaking-change 8.0.0\n */\nexport class ConnectedPositionStrategy implements PositionStrategy {\n  /**\n   * Reference to the underlying position strategy to which all the API calls are proxied.\n   * @docs-private\n   */\n  _positionStrategy: FlexibleConnectedPositionStrategy;\n\n  /** The overlay to which this strategy is attached. */\n  private _overlayRef: OverlayReference;\n\n  private _direction: Direction | null;\n\n  /** Ordered list of preferred positions, from most to least desirable. */\n  _preferredPositions: ConnectionPositionPair[] = [];\n\n  /** Emits an event when the connection point changes. */\n  get onPositionChange(): Observable<ConnectedOverlayPositionChange> {\n    return this._positionStrategy.positionChanges;\n  }\n\n  constructor(\n      originPos: OriginConnectionPosition, overlayPos: OverlayConnectionPosition,\n      connectedTo: ElementRef<HTMLElement>, viewportRuler: ViewportRuler, document: Document,\n      platform: Platform, overlayContainer: OverlayContainer) {\n    // Since the `ConnectedPositionStrategy` is deprecated and we don't want to maintain\n    // the extra logic, we create an instance of the positioning strategy that has some\n    // defaults that make it behave as the old position strategy and to which we'll\n    // proxy all of the API calls.\n    this._positionStrategy = new FlexibleConnectedPositionStrategy(\n                                 connectedTo, viewportRuler, document, platform, overlayContainer)\n                                 .withFlexibleDimensions(false)\n                                 .withPush(false)\n                                 .withViewportMargin(0);\n\n    this.withFallbackPosition(originPos, overlayPos);\n  }\n\n  /** Ordered list of preferred positions, from most to least desirable. */\n  get positions(): ConnectionPositionPair[] {\n    return this._preferredPositions;\n  }\n\n  /** Attach this position strategy to an overlay. */\n  attach(overlayRef: OverlayReference): void {\n    this._overlayRef = overlayRef;\n    this._positionStrategy.attach(overlayRef);\n\n    if (this._direction) {\n      overlayRef.setDirection(this._direction);\n      this._direction = null;\n    }\n  }\n\n  /** Disposes all resources used by the position strategy. */\n  dispose() {\n    this._positionStrategy.dispose();\n  }\n\n  /** @docs-private */\n  detach() {\n    this._positionStrategy.detach();\n  }\n\n  /**\n   * Updates the position of the overlay element, using whichever preferred position relative\n   * to the origin fits on-screen.\n   * @docs-private\n   */\n  apply(): void {\n    this._positionStrategy.apply();\n  }\n\n  /**\n   * Re-positions the overlay element with the trigger in its last calculated position,\n   * even if a position higher in the \"preferred positions\" list would now fit. This\n   * allows one to re-align the panel without changing the orientation of the panel.\n   */\n  recalculateLastPosition(): void {\n    this._positionStrategy.reapplyLastPosition();\n  }\n\n  /**\n   * Sets the list of Scrollable containers that host the origin element so that\n   * on reposition we can evaluate if it or the overlay has been clipped or outside view. Every\n   * Scrollable must be an ancestor element of the strategy's origin element.\n   */\n  withScrollableContainers(scrollables: CdkScrollable[]) {\n    this._positionStrategy.withScrollableContainers(scrollables);\n  }\n\n  /**\n   * Adds a new preferred fallback position.\n   * @param originPos\n   * @param overlayPos\n   */\n  withFallbackPosition(\n      originPos: OriginConnectionPosition,\n      overlayPos: OverlayConnectionPosition,\n      offsetX?: number,\n      offsetY?: number): this {\n\n    const position = new ConnectionPositionPair(originPos, overlayPos, offsetX, offsetY);\n    this._preferredPositions.push(position);\n    this._positionStrategy.withPositions(this._preferredPositions);\n    return this;\n  }\n\n  /**\n   * Sets the layout direction so the overlay's position can be adjusted to match.\n   * @param dir New layout direction.\n   */\n  withDirection(dir: 'ltr' | 'rtl'): this {\n    // Since the direction might be declared before the strategy is attached,\n    // we save the value in a temporary property and we'll transfer it to the\n    // overlay ref on attachment.\n    if (this._overlayRef) {\n      this._overlayRef.setDirection(dir);\n    } else {\n      this._direction = dir;\n    }\n\n    return this;\n  }\n\n  /**\n   * Sets an offset for the overlay's connection point on the x-axis\n   * @param offset New offset in the X axis.\n   */\n  withOffsetX(offset: number): this {\n    this._positionStrategy.withDefaultOffsetX(offset);\n    return this;\n  }\n\n  /**\n   * Sets an offset for the overlay's connection point on the y-axis\n   * @param  offset New offset in the Y axis.\n   */\n  withOffsetY(offset: number): this {\n    this._positionStrategy.withDefaultOffsetY(offset);\n    return this;\n  }\n\n  /**\n   * Sets whether the overlay's position should be locked in after it is positioned\n   * initially. When an overlay is locked in, it won't attempt to reposition itself\n   * when the position is re-applied (e.g. when the user scrolls away).\n   * @param isLocked Whether the overlay should locked in.\n   */\n  withLockedPosition(isLocked: boolean): this {\n    this._positionStrategy.withLockedPosition(isLocked);\n    return this;\n  }\n\n  /**\n   * Overwrites the current set of positions with an array of new ones.\n   * @param positions Position pairs to be set on the strategy.\n   */\n  withPositions(positions: ConnectionPositionPair[]): this {\n    this._preferredPositions = positions.slice();\n    this._positionStrategy.withPositions(this._preferredPositions);\n    return this;\n  }\n\n  /**\n   * Sets the origin element, relative to which to position the overlay.\n   * @param origin Reference to the new origin element.\n   */\n  setOrigin(origin: ElementRef): this {\n    this._positionStrategy.setOrigin(origin);\n    return this;\n  }\n}\n"]}