321 lines
9.9 KiB
Markdown
321 lines
9.9 KiB
Markdown
# app
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The `app` module is responsible for controlling the application's lifecycle.
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The following example shows how to quit the application when the last window is closed:
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```javascript
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var app = require('app');
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app.on('window-all-closed', function() {
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app.quit();
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});
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```
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## Event: will-finish-launching
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Emitted when the application has finished basic startup. On Windows and Linux,
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the `will-finish-launching` event is the same as the `ready` event; on OS X,
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this event represents the `applicationWillFinishLaunching` notification of `NSApplication`.
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You would usually set up listeners for the `open-file` and `open-url` events here,
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and start the crash reporter and auto updater.
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In most cases, you should just do everything in the `ready` event handler.
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## Event: ready
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Emitted when Electron has finished initialization.
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## Event: window-all-closed
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Emitted when all windows have been closed.
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This event is only emitted when the application is not going to quit. If the
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user pressed `Cmd + Q`, or the developer called `app.quit()`, Electron would
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first try to close all the windows and then emit the `will-quit` event, and in
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this case the `window-all-closed` event would not be emitted.
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## Event: before-quit
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* `event` Event
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Emitted before the application starts closing its windows.
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Calling `event.preventDefault()` will prevent the default behaviour, which is
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terminating the application.
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## Event: will-quit
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* `event` Event
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Emitted when all windows have been closed and the application will quit.
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Calling `event.preventDefault()` will prevent the default behaviour, which is
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terminating the application.
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See the description of the `window-all-closed` event for the differences between the `will-quit`
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and `window-all-closed` events.
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## Event: quit
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Emitted when the application is quitting.
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## Event: open-file
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* `event` Event
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* `path` String
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Emitted when the user wants to open a file with the application. The `open-file` event
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is usually emitted when the application is already open and the OS wants to reuse the
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application to open the file. `open-file` is also emitted when a file is dropped onto the
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dock and the application is not yet running. Make sure to listen for the `open-file`
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event very early in your application startup to handle this case (even before the
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`ready` event is emitted).
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You should call `event.preventDefault()` if you want to handle this event.
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## Event: open-url
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* `event` Event
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* `url` String
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Emitted when the user wants to open a URL with the application. The URL scheme
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must be registered to be opened by your application.
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You should call `event.preventDefault()` if you want to handle this event.
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## Event: activate-with-no-open-windows
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Emitted when the application is activated while there are no open windows, which
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usually happens when the user has closed all of the application's windows and then
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clicks on the application's dock icon.
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## Event: browser-window-blur
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* `event` Event
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* `window` BrowserWindow
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Emitted when a [browserWindow](browser-window.md) gets blurred.
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## Event: browser-window-focus
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* `event` Event
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* `window` BrowserWindow
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Emitted when a [browserWindow](browser-window.md) gets focused.
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### Event: 'select-certificate'
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Emitted when a client certificate is requested.
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* `event` Event
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* `webContents` [WebContents](browser-window.md#class-webcontents)
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* `url` String
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* `certificateList` [Objects]
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* `data` PEM encoded data
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* `issuerName` Issuer's Common Name
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* `callback` Function
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```
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app.on('select-certificate', function(event, host, url, list, callback) {
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event.preventDefault();
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callback(list[0]);
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})
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```
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`url` corresponds to the navigation entry requesting the client certificate.
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`callback` needs to be called with an entry filtered from the list.
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`event.preventDefault()` prevents the application from using the first certificate
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from the store.
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### Event: 'gpu-process-crashed'
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Emitted when the gpu process crashes.
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## app.quit()
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Try to close all windows. The `before-quit` event will first be emitted. If all
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windows are successfully closed, the `will-quit` event will be emitted and by
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default the application will terminate.
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This method guarantees that all `beforeunload` and `unload` event handlers are correctly
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executed. It is possible that a window cancels the quitting by returning
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`false` in the `beforeunload` event handler.
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## app.getAppPath()
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Returns the current application directory.
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## app.getPath(name)
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* `name` String
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Retrieves a path to a special directory or file associated with `name`. On
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failure an `Error` is thrown.
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You can request the following paths by the name:
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* `home`: User's home directory
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* `appData`: Per-user application data directory, which by default points to:
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* `%APPDATA%` on Windows
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* `$XDG_CONFIG_HOME` or `~/.config` on Linux
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* `~/Library/Application Support` on OS X
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* `userData`: The directory for storing your app's configuration files, which by
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default it is the `appData` directory appended with your app's name
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* `cache`: Per-user application cache directory, which by default points to:
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* `%APPDATA%` on Windows (which doesn't have a universal cache location)
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* `$XDG_CACHE_HOME` or `~/.cache` on Linux
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* `~/Library/Caches` on OS X
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* `userCache`: The directory for placing your app's caches, by default it is the
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`cache` directory appended with your app's name
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* `temp`: Temporary directory
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* `userDesktop`: The current user's Desktop directory
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* `exe`: The current executable file
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* `module`: The `libchromiumcontent` library
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## app.setPath(name, path)
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* `name` String
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* `path` String
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Overrides the `path` to a special directory or file associated with `name`. If
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the path specifies a directory that does not exist, the directory will be
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created by this method. On failure an `Error` is thrown.
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You can only override paths of `name`s defined in `app.getPath`.
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By default, web pages' cookies and caches will be stored under the `userData`
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directory. If you want to change this location, you have to override the
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`userData` path before the `ready` event of the `app` module is emitted.
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## app.getVersion()
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Returns the version of the loaded application. If no version is found in the
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application's `package.json` file, the version of the current bundle or executable is
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returned.
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## app.getName()
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Returns the current application's name, which is the name in the application's
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`package.json` file.
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Usually the `name` field of `package.json` is a short lowercased name, according
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to the npm modules spec. You should usually also specify a `productName`
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field, which is your application's full capitalized name, and which will be
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preferred over `name` by Electron.
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## app.resolveProxy(url, callback)
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* `url` URL
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* `callback` Function
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Resolves the proxy information for `url`. The `callback` will be called with
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`callback(proxy)` when the request is performed.
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## app.addRecentDocument(path)
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* `path` String
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Adds `path` to the recent documents list.
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This list is managed by the OS. On Windows you can visit the list from the task
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bar, and on OS X you can visit it from dock menu.
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## app.clearRecentDocuments()
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Clears the recent documents list.
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## app.setUserTasks(tasks)
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* `tasks` Array - Array of `Task` objects
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Adds `tasks` to the [Tasks][tasks] category of the JumpList on Windows.
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`tasks` is an array of `Task` objects in following format:
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* `Task` Object
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* `program` String - Path of the program to execute, usually you should
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specify `process.execPath` which opens the current program
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* `arguments` String - The command line arguments when `program` is
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executed
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* `title` String - The string to be displayed in a JumpList
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* `description` String - Description of this task
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* `iconPath` String - The absolute path to an icon to be displayed in a
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JumpList, which can be an arbitrary resource file that contains an icon. You can
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usually specify `process.execPath` to show the icon of the program
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* `iconIndex` Integer - The icon index in the icon file. If an icon file
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consists of two or more icons, set this value to identify the icon. If an
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icon file consists of one icon, this value is 0
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**Note:** This API is only available on Windows.
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## app.commandLine.appendSwitch(switch, [value])
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Append a switch [with optional value] to Chromium's command line.
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**Note:** This will not affect `process.argv`, and is mainly used by developers
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to control some low-level Chromium behaviors.
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## app.commandLine.appendArgument(value)
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Append an argument to Chromium's command line. The argument will be quoted correctly.
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**Note:** This will not affect `process.argv`.
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## app.dock.bounce([type])
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* `type` String - Can be `critical` or `informational`. The default is
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`informational`
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When `critical` is passed, the dock icon will bounce until either the
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application becomes active or the request is canceled.
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When `informational` is passed, the dock icon will bounce for one second. However,
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the request remains active until either the application becomes active or
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the request is canceled.
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An ID representing the request is returned.
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**Note:** This API is only available on OS X.
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## app.dock.cancelBounce(id)
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* `id` Integer
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Cancel the bounce of `id`.
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**Note:** This API is only available on OS X.
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## app.dock.setBadge(text)
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* `text` String
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Sets the string to be displayed in the dock’s badging area.
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**Note:** This API is only available on OS X.
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## app.dock.getBadge()
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Returns the badge string of the dock.
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**Note:** This API is only available on OS X.
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## app.dock.hide()
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Hides the dock icon.
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**Note:** This API is only available on OS X.
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## app.dock.show()
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Shows the dock icon.
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**Note:** This API is only available on OS X.
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## app.dock.setMenu(menu)
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* `menu` Menu
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Sets the application's [dock menu][dock-menu].
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**Note:** This API is only available on OS X.
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[dock-menu]:https://developer.apple.com/library/mac/documentation/Carbon/Conceptual/customizing_docktile/concepts/dockconcepts.html#//apple_ref/doc/uid/TP30000986-CH2-TPXREF103
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[tasks]:http://msdn.microsoft.com/en-us/library/windows/desktop/dd378460(v=vs.85).aspx#tasks
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