lisn.js/dist/cjs/modules/x-resize-observer.cjs.map

Simply handle user gestures and actions. Includes widgets.

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Short-lived, so ok to use a Map.\n    const buffer = MH.newMap<Element, ResizeObserverEntry>();\n\n    // Since internally we have two observers, one for border box, one for\n    // content box, we will get called initially twice for a target. So we keep\n    // a counter of 1 or 2 for how many more calls to ignore.\n    const targetsToSkip = MH.newWeakMap<Element, 1 | 2>();\n\n    let observedTargets = MH.newWeakSet<Element>();\n\n    debounceWindow ??= 0;\n\n    let timer: ReturnType<typeof setTimeout> | null = null;\n    const resizeHandler = (entries: ResizeObserverEntry[]) => {\n      // Override entries for previous targets, but keep entries whose targets\n      // were not resized in this round\n      for (const entry of entries) {\n        const target = MH.targetOf(entry);\n        const skipNum = targetsToSkip.get(target);\n        if (skipNum !== undefined) {\n          if (skipNum === 2) {\n            // expect one more call\n            targetsToSkip.set(target, 1);\n          } else {\n            // done\n            /* istanbul ignore next */\n            if (skipNum !== 1) {\n              logError(MH.bugError(`# targetsToSkip is ${skipNum}`));\n            }\n            MH.deleteKey(targetsToSkip, target);\n          }\n\n          continue;\n        }\n\n        buffer.set(target, entry);\n      }\n\n      debug: logger?.debug9(\n        `Got ${entries.length} new entries. ` +\n          `Have ${buffer.size} unique-target entries`,\n        entries,\n      );\n\n      if (!timer && MH.sizeOf(buffer)) {\n        timer = MH.setTimer(() => {\n          if (MH.sizeOf(buffer)) {\n            callback(MH.arrayFrom(buffer.values()), this);\n            buffer.clear();\n          }\n\n          timer = null;\n        }, debounceWindow);\n      }\n    };\n\n    const borderObserver = MH.newResizeObserver(resizeHandler);\n    const contentObserver = MH.newResizeObserver(resizeHandler);\n    if (!borderObserver || !contentObserver) {\n      logWarn(\n        \"This browser does not support ResizeObserver. Some features won't work.\",\n      );\n    }\n\n    const observeTarget = (target: Element) => {\n      observedTargets.add(target);\n      borderObserver?.observe(target, { box: \"border-box\" });\n      contentObserver?.observe(target);\n    };\n\n    // --------------------\n\n    this.observe = (...targets) => {\n      debug: logger?.debug10(\"Observing targets\", targets);\n\n      for (const target of targets) {\n        observeTarget(target);\n      }\n    };\n\n    this.observeLater = (...targets) => {\n      debug: logger?.debug10(\"Observing targets (later)\", targets);\n      for (const target of targets) {\n        // Only skip them if not already observed, otherwise the initial\n        // (almost) immediate callback won't happen anyway.\n        if (observedTargets.has(target)) {\n          continue;\n        }\n\n        targetsToSkip.set(target, 2);\n        observeTarget(target);\n      }\n    };\n\n    this.unobserve = (...targets) => {\n      debug: logger?.debug10(\"Unobserving targets\", targets);\n\n      for (const target of targets) {\n        MH.deleteKey(observedTargets, target);\n        borderObserver?.unobserve(target);\n        contentObserver?.unobserve(target);\n      }\n    };\n\n    this.disconnect = () => {\n      debug: logger?.debug10(\"Disconnecting\");\n      observedTargets = MH.newWeakSet();\n      borderObserver?.disconnect();\n      contentObserver?.disconnect();\n    };\n  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