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74 lines
2.7 KiB
Clojure
74 lines
2.7 KiB
Clojure
;; This Source Code Form is subject to the terms of the Mozilla Public
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;; License, v. 2.0. If a copy of the MPL was not distributed with this
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;; file, You can obtain one at http://mozilla.org/MPL/2.0/.
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;;
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;; Copyright (c) 2015-2017 Andrey Antukh <niwi@niwi.nz>
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;; Copyright (c) 2015-2017 Juan de la Cruz <delacruzgarciajuan@gmail.com>
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(ns app.main.ui.workspace.scroll
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"Workspace scroll events handling."
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(:require [beicon.core :as rx]
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[potok.core :as ptk]
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[app.main.refs :as refs]
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[app.util.dom :as dom]
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[app.common.geom.point :as gpt]))
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;; FIXME: revisit this ns in order to find a better location for its functions
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;; TODO: this need a good refactor (probably move to events with access to the state)
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(defn set-scroll-position
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[dom position]
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(set! (.-scrollLeft dom) (:x position))
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(set! (.-scrollTop dom) (:y position)))
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(defn set-scroll-center
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[dom center]
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(let [viewport-width (.-offsetWidth dom)
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viewport-height (.-offsetHeight dom)
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position-x (- (* (:x center) 1 #_@refs/selected-zoom) (/ viewport-width 2))
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position-y (- (* (:y center) 1 #_@refs/selected-zoom) (/ viewport-height 2))
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position (gpt/point position-x position-y)]
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(set-scroll-position dom position)))
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(defn scroll-to-page-center
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[dom page]
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(let [page-width (get-in page [:metadata :width])
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page-height (get-in page [:metadata :height])
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center (gpt/point (+ 1200 (/ page-width 2)) (+ 1200 (/ page-height 2)))]
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(set-scroll-center dom center)))
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(defn get-current-center
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[dom]
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(let [viewport-width (.-offsetWidth dom)
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viewport-height (.-offsetHeight dom)
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scroll-left (.-scrollLeft dom)
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scroll-top (.-scrollTop dom)]
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(gpt/point
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(+ (/ viewport-width 2) scroll-left)
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(+ (/ viewport-height 2) scroll-top))))
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(defn get-current-center-absolute
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[dom]
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(gpt/divide (get-current-center dom) (gpt/point @refs/selected-zoom)))
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(defn get-current-position
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"Get the coordinates of the currently visible point at top left of viewport"
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[dom]
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(let [scroll-left (.-scrollLeft dom)
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scroll-top (.-scrollTop dom)]
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(gpt/point scroll-left scroll-top)))
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(defn get-current-position-absolute
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[dom]
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(let [current-position (get-current-position dom)]
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(gpt/divide (get-current-position dom) (gpt/point @refs/selected-zoom))))
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(defn scroll-to-point
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[dom point position]
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(let [viewport-offset (gpt/subtract point position)
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selected-zoom (gpt/point @refs/selected-zoom)
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new-scroll-position (gpt/subtract
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(gpt/multiply point selected-zoom)
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(gpt/multiply viewport-offset selected-zoom))]
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(set-scroll-position dom new-scroll-position)))
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