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});\n    win.addEventListener('keyboardDidHide', function () { return setKeyboardClose(win); });\n};\nvar setKeyboardOpen = function (win, ev) {\n    fireKeyboardOpenEvent(win, ev);\n    keyboardOpen = true;\n};\nvar setKeyboardClose = function (win) {\n    fireKeyboardCloseEvent(win);\n    keyboardOpen = false;\n};\n/**\n * Returns `true` if the `keyboardOpen` flag is not\n * set, the previous visual viewport width equal the current\n * visual viewport width, and if the scaled difference\n * of the previous visual viewport height minus the current\n * visual viewport height is greater than KEYBOARD_THRESHOLD\n *\n * We need to be able to accomodate users who have zooming\n * enabled in their browser (or have zoomed in manually) which\n * is why we take into account the current visual viewport's\n * scale value.\n */\nvar keyboardDidOpen = function () {\n    var scaledHeightDifference = (previousVisualViewport.height - currentVisualViewport.height) * currentVisualViewport.scale;\n    return (!keyboardOpen &&\n        previousVisualViewport.width === currentVisualViewport.width &&\n        scaledHeightDifference > KEYBOARD_THRESHOLD &&\n        !layoutViewportDidChange());\n};\n/**\n * Returns `true` if the keyboard is open,\n * but the keyboard did not close\n */\nvar keyboardDidResize = function (win) {\n    return keyboardOpen && !keyboardDidClose(win);\n};\n/**\n * Determine if the keyboard was closed\n * Returns `true` if the `keyboardOpen` flag is set and\n * the current visual viewport height equals the\n * layout viewport height.\n */\nvar keyboardDidClose = function (win) {\n    return keyboardOpen && currentVisualViewport.height === win.innerHeight;\n};\n/**\n * Determine if the layout viewport has\n * changed since the last visual viewport change.\n * It is rare that a layout viewport change is not\n * associated with a visual viewport change so we\n * want to make sure we don't get any false positives.\n */\nvar layoutViewportDidChange = function () {\n    return (currentLayoutViewport.width !== previousLayoutViewport.width ||\n        currentLayoutViewport.height !== previousLayoutViewport.height);\n};\n/**\n * Dispatch a keyboard open event\n */\nvar fireKeyboardOpenEvent = function (win, nativeEv) {\n    var keyboardHeight = nativeEv ? nativeEv.keyboardHeight : win.innerHeight - currentVisualViewport.height;\n    var ev = new CustomEvent(KEYBOARD_DID_OPEN, {\n        detail: { keyboardHeight: keyboardHeight }\n    });\n    win.dispatchEvent(ev);\n};\n/**\n * Dispatch a keyboard close event\n */\nvar fireKeyboardCloseEvent = function (win) {\n    var ev = new CustomEvent(KEYBOARD_DID_CLOSE);\n    win.dispatchEvent(ev);\n};\n/**\n * Given a window object, create a copy of\n * the current visual and layout viewport states\n * while also preserving the previous visual and\n * layout viewport states\n */\nvar trackViewportChanges = function (win) {\n    previousVisualViewport = Object.assign({}, currentVisualViewport);\n    currentVisualViewport = copyVisualViewport(win.visualViewport);\n    previousLayoutViewport = Object.assign({}, currentLayoutViewport);\n    currentLayoutViewport = copyLayoutViewport(win);\n};\n/**\n * Creates a deep copy of the visual viewport\n * at a given state\n */\nvar copyVisualViewport = function (visualViewport) {\n    return {\n        width: Math.round(visualViewport.width),\n        height: Math.round(visualViewport.height),\n        offsetTop: visualViewport.offsetTop,\n        offsetLeft: visualViewport.offsetLeft,\n        pageTop: visualViewport.pageTop,\n        pageLeft: visualViewport.pageLeft,\n        scale: visualViewport.scale\n    };\n};\n/**\n * Creates a deep copy of the layout viewport\n * at a given state\n */\nvar copyLayoutViewport = function (win) {\n    return {\n        width: win.innerWidth,\n        height: win.innerHeight\n    };\n};\nexport { KEYBOARD_DID_CLOSE, KEYBOARD_DID_OPEN, copyLayoutViewport, copyVisualViewport, keyboardDidClose, keyboardDidOpen, keyboardDidResize, resetKeyboardAssist, setKeyboardClose, setKeyboardOpen, startKeyboardAssist, trackViewportChanges };\n"],"sourceRoot":""}