79 lines
2.2 KiB
CoffeeScript
79 lines
2.2 KiB
CoffeeScript
# JavaScript implementation of Chromium's NavigationController.
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# Instead of relying on Chromium for history control, we compeletely do history
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# control on user land, and only rely on WebContents.loadUrl for navigation.
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# This helps us avoid Chromium's various optimizations so we can ensure renderer
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# process is restarted everytime.
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class NavigationController
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constructor: (@webContents) ->
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@history = []
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@currentIndex = -1
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@pendingIndex = -1
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@webContents.on 'navigation-entry-commited', (event, url) =>
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if @pendingIndex is -1 # Normal navigation.
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@history = @history.slice 0, @currentIndex + 1 # Clear history.
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if @history[@currentIndex] isnt url
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@currentIndex++
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@history.push url
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else # Go to index.
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@currentIndex = @pendingIndex
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@pendingIndex = -1
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@history[@currentIndex] = url
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loadUrl: (url, options={}) ->
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@pendingIndex = -1
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@webContents._loadUrl url, options
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getUrl: ->
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if @currentIndex is -1
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''
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else
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@history[@currentIndex]
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stop: ->
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@pendingIndex = -1
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@webContents._stop()
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reload: ->
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@pendingIndex = @currentIndex
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@webContents._loadUrl @getUrl(), {}
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reloadIgnoringCache: ->
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@webContents._reloadIgnoringCache() # Rely on WebContents to clear cache.
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@reload()
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canGoBack: ->
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@getActiveIndex() > 0
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canGoForward: ->
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@getActiveIndex() < @history.length - 1
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canGoToIndex: (index) ->
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index >=0 and index < @history.length
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canGoToOffset: (offset) ->
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@canGoToIndex @currentIndex + offset
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goBack: ->
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return unless @canGoBack()
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@pendingIndex = @getActiveIndex() - 1
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@webContents._loadUrl @history[@pendingIndex], {}
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goForward: ->
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return unless @canGoForward()
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@pendingIndex = @getActiveIndex() + 1
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@webContents._loadUrl @history[@pendingIndex], {}
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goToIndex: (index) ->
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return unless @canGoToIndex index
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@pendingIndex = index
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@webContents._loadUrl @history[@pendingIndex], {}
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goToOffset: (offset) ->
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return unless @canGoToOffset offset
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@goToIndex @currentIndex + offset
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getActiveIndex: ->
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if @pendingIndex is -1 then @currentIndex else @pendingIndex
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module.exports = NavigationController
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