Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 313 insertions, 0 deletions

diff --git a/devtools/client/inspector/node-picker.js b/devtools/client/inspector/node-picker.js
new file mode 100644
index 0000000000..24b53b51e0
--- /dev/null
+++ b/devtools/client/inspector/node-picker.js
@@ -0,0 +1,313 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+loader.lazyRequireGetter(
+  this,
+  "EventEmitter",
+  "resource://devtools/shared/event-emitter.js"
+);
+
+/**
+ * Client-side NodePicker module.
+ * To be used by inspector front when it needs to select DOM elements.
+ *
+ * NodePicker is a proxy for the node picker functionality from WalkerFront instances
+ * of all available InspectorFronts. It is a single point of entry for the client to:
+ * - invoke actions to start and stop picking nodes on all walkers
+ * - listen to node picker events from all walkers and relay them to subscribers
+ *
+ *
+ * @param {Commands} commands
+ *        The commands object with all interfaces defined from devtools/shared/commands/
+ * @param {Selection} selection
+ *        The global Selection object
+ */
+class NodePicker extends EventEmitter {
+  constructor(commands, selection) {
+    super();
+    this.commands = commands;
+    this.targetCommand = commands.targetCommand;
+
+    // Whether or not the node picker is active.
+    this.isPicking = false;
+    // Whether to focus the top-level frame before picking nodes.
+    this.doFocus = false;
+  }
+
+  // The set of inspector fronts corresponding to the targets where picking happens.
+  #currentInspectorFronts = new Set();
+
+  /**
+   * Start/stop the element picker on the debuggee target.
+   *
+   * @param {Boolean} doFocus
+   *        Optionally focus the content area once the picker is activated.
+   * @return Promise that resolves when done
+   */
+  togglePicker = doFocus => {
+    if (this.isPicking) {
+      return this.stop({ canceled: true });
+    }
+    return this.start(doFocus);
+  };
+
+  /**
+   * This DOCUMENT_EVENT resource callback is only used for webextension targets
+   * to workaround the fact that some navigations will not create/destroy any
+   * target (eg when jumping from a background document to a popup document).
+   **/
+  #onWebExtensionDocumentEventAvailable = async resources => {
+    const { DOCUMENT_EVENT } = this.commands.resourceCommand.TYPES;
+
+    for (const resource of resources) {
+      if (
+        resource.resourceType == DOCUMENT_EVENT &&
+        resource.name === "dom-complete" &&
+        resource.targetFront.isTopLevel &&
+        // When switching frames for a webextension target, a first dom-complete
+        // resource is emitted when we start watching the new docshell, in the
+        // WindowGlobalTargetActor progress listener.
+        //
+        // However here, we are expecting the "fake" dom-complete resource
+        // emitted specifically from the webextension target actor, when the
+        // new docshell is finally recognized to be linked to the target's
+        // webextension. This resource is emitted from `_changeTopLevelDocument`
+        // and is the only one which will have `isFrameSwitching` set to true.
+        //
+        // It also emitted after the one for the new docshell, so to avoid
+        // stopping and starting the node-picker twice, we filter out the first
+        // resource, which does not have `isFrameSwitching` set.
+        resource.isFrameSwitching
+      ) {
+        const inspectorFront = await resource.targetFront.getFront("inspector");
+        // When a webextension target navigates, it will typically be between
+        // documents which are not under the same root (fallback-document,
+        // devtools-panel, popup). Even though we are not switching targets, we
+        // need to restart the node picker.
+        await inspectorFront.walker.cancelPick();
+        await inspectorFront.walker.pick(this.doFocus);
+        this.emitForTests("node-picker-webextension-target-restarted");
+      }
+    }
+  };
+
+  /**
+   * Tell the walker front corresponding to the given inspector front to enter node
+   * picking mode (listen for mouse movements over its nodes) and set event listeners
+   * associated with node picking: hover node, pick node, preview, cancel. See WalkerSpec.
+   *
+   * @param {InspectorFront} inspectorFront
+   * @return {Promise}
+   */
+  #onInspectorFrontAvailable = async inspectorFront => {
+    this.#currentInspectorFronts.add(inspectorFront);
+    // watchFront may notify us about inspector fronts that aren't initialized yet,
+    // so ensure waiting for initialization in order to have a defined `walker` attribute.
+    await inspectorFront.initialize();
+    const { walker } = inspectorFront;
+    walker.on("picker-node-hovered", this.#onHovered);
+    walker.on("picker-node-picked", this.#onPicked);
+    walker.on("picker-node-previewed", this.#onPreviewed);
+    walker.on("picker-node-canceled", this.#onCanceled);
+    await walker.pick(this.doFocus);
+
+    this.emitForTests("inspector-front-ready-for-picker", walker);
+  };
+
+  /**
+   * Tell the walker front corresponding to the given inspector front to exit the node
+   * picking mode and remove all event listeners associated with node picking.
+   *
+   * @param {InspectorFront} inspectorFront
+   * @param {Boolean} isDestroyCodePath
+   *        Optional. If true, we assume that's when the toolbox closes
+   *        and we should avoid doing any RDP request.
+   * @return {Promise}
+   */
+  #onInspectorFrontDestroyed = async (
+    inspectorFront,
+    { isDestroyCodepath } = {}
+  ) => {
+    this.#currentInspectorFronts.delete(inspectorFront);
+
+    const { walker } = inspectorFront;
+    if (!walker) {
+      return;
+    }
+
+    walker.off("picker-node-hovered", this.#onHovered);
+    walker.off("picker-node-picked", this.#onPicked);
+    walker.off("picker-node-previewed", this.#onPreviewed);
+    walker.off("picker-node-canceled", this.#onCanceled);
+    // Only do a RDP request if we stop the node picker from a user action.
+    // Avoid doing one when we close the toolbox, in this scenario
+    // the walker actor on the server side will automatically cancel the node picking.
+    if (!isDestroyCodepath) {
+      await walker.cancelPick();
+    }
+  };
+
+  /**
+   * While node picking, we want each target's walker fronts to listen for mouse
+   * movements over their nodes and emit events. Walker fronts are obtained from
+   * inspector fronts so we watch for the creation and destruction of inspector fronts
+   * in order to add or remove the necessary event listeners.
+   *
+   * @param {TargetFront} targetFront
+   * @return {Promise}
+   */
+  #onTargetAvailable = async ({ targetFront }) => {
+    targetFront.watchFronts(
+      "inspector",
+      this.#onInspectorFrontAvailable,
+      this.#onInspectorFrontDestroyed
+    );
+  };
+
+  /**
+   * Start the element picker.
+   * This will instruct walker fronts of all available targets (and those of targets
+   * created while node picking is active) to listen for mouse movements over their nodes
+   * and trigger events when a node is hovered or picked.
+   *
+   * @param {Boolean} doFocus
+   *        Optionally focus the content area once the picker is activated.
+   */
+  start = async doFocus => {
+    if (this.isPicking) {
+      return;
+    }
+    this.isPicking = true;
+    this.doFocus = doFocus;
+
+    this.emit("picker-starting");
+
+    this.targetCommand.watchTargets({
+      types: this.targetCommand.ALL_TYPES,
+      onAvailable: this.#onTargetAvailable,
+    });
+
+    if (this.targetCommand.descriptorFront.isWebExtension) {
+      await this.commands.resourceCommand.watchResources(
+        [this.commands.resourceCommand.TYPES.DOCUMENT_EVENT],
+        {
+          onAvailable: this.#onWebExtensionDocumentEventAvailable,
+        }
+      );
+    }
+
+    this.emit("picker-started");
+  };
+
+  /**
+   * Stop the element picker. Note that the picker is automatically stopped when
+   * an element is picked.
+   *
+   * @param {Boolean} isDestroyCodePath
+   *        Optional. If true, we assume that's when the toolbox closes
+   *        and we should avoid doing any RDP request.
+   * @param {Boolean} canceled
+   *        Optional. If true, emit an additional event to notify that the
+   *        picker was canceled, ie stopped without selecting a node.
+   */
+  stop = async ({ isDestroyCodepath, canceled } = {}) => {
+    if (!this.isPicking) {
+      return;
+    }
+    this.isPicking = false;
+    this.doFocus = false;
+
+    this.targetCommand.unwatchTargets({
+      types: this.targetCommand.ALL_TYPES,
+      onAvailable: this.#onTargetAvailable,
+    });
+
+    if (this.targetCommand.descriptorFront.isWebExtension) {
+      this.commands.resourceCommand.unwatchResources(
+        [this.commands.resourceCommand.TYPES.DOCUMENT_EVENT],
+        {
+          onAvailable: this.#onWebExtensionDocumentEventAvailable,
+        }
+      );
+    }
+
+    const promises = [];
+    for (const inspectorFront of this.#currentInspectorFronts) {
+      promises.push(
+        this.#onInspectorFrontDestroyed(inspectorFront, {
+          isDestroyCodepath,
+        })
+      );
+    }
+    await Promise.all(promises);
+
+    this.#currentInspectorFronts.clear();
+
+    this.emit("picker-stopped");
+
+    if (canceled) {
+      this.emit("picker-node-canceled");
+    }
+  };
+
+  destroy() {
+    // Do not await for stop as the isDestroy argument will make this method synchronous
+    // and we want to avoid having an async destroy
+    this.stop({ isDestroyCodepath: true });
+    this.targetCommand = null;
+    this.commands = null;
+  }
+
+  /**
+   * When a node is hovered by the mouse when the highlighter is in picker mode
+   *
+   * @param {Object} data
+   *        Information about the node being hovered
+   */
+  #onHovered = data => {
+    this.emit("picker-node-hovered", data.node);
+
+    // We're going to cleanup references for all the other walkers, so that if we hover
+    // back the same node, we will receive a new `picker-node-hovered` event.
+    for (const inspectorFront of this.#currentInspectorFronts) {
+      if (inspectorFront.walker !== data.node.walkerFront) {
+        inspectorFront.walker.clearPicker();
+      }
+    }
+  };
+
+  /**
+   * When a node has been picked while the highlighter is in picker mode
+   *
+   * @param {Object} data
+   *        Information about the picked node
+   */
+  #onPicked = data => {
+    this.emit("picker-node-picked", data.node);
+    return this.stop();
+  };
+
+  /**
+   * When a node has been shift-clicked (previewed) while the highlighter is in
+   * picker mode
+   *
+   * @param {Object} data
+   *        Information about the picked node
+   */
+  #onPreviewed = data => {
+    this.emit("picker-node-previewed", data.node);
+  };
+
+  /**
+   * When the picker is canceled, stop the picker, and make sure the toolbox
+   * gets the focus.
+   */
+  #onCanceled = data => {
+    return this.stop({ canceled: true });
+  };
+}
+
+module.exports = NodePicker;