Stackedit/doc/developer-guide.md

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Developer guide
===============
Getting started
---------------
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### Pre-requisites
- [Git][1]
- [node.js/npm][2]
- [Grunt][3]
- [Bower][4]
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### Before debugging
- Download development tools:
npm install
- Download dependencies:
bower install
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- Serve **StackEdit** at `http://localhost/`:
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(export PORT=80 && node server.js)
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- Run Chrome without application cache:
chrome --disable-application-cache
- Run **StackEdit** in debug mode (serve original files instead of minified):
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http://localhost/?debug
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### Add new dependencies
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> **NOTE:** StackEdit uses [RequireJS][5] for asynchronous module definition ([AMD][6]).
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- Install new dependencies using [Bower][7]:
bower install <library> --save
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- Add the new dependency to [RequireJS][8] configuration file (`main.js`):
grunt bower
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### Build/minify
grunt
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### Deploy
- on Heroku:
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heroku create my-stackedit-instance
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git push heroku master
- in a Docker container:
docker build -t my-stackedit-image .
docker run -p 3000 my-stackedit-image
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> **NOTE:** OAuth authorizations work out of the box for address `http://localhost/` except for WordPress. To allow another address, you have to add specific keys at the end of `constants.js` and eventually to set up specific proxies with the corresponding key/secret pairs ([WordPress Proxy][9], [Tumblr Proxy][10] and [Gatekeeper][11]).
Architecture
------------
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![Architecture diagram][12]
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The modules are loaded by RequireJS in the following order:
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1. The 3rd party libraries (jQuery, underscore.js...)
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2. The `Extension` modules
3. The `eventMgr` module
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4. The `core` module
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5. The `fileMgr` module and the helpers modules
6. The `Provider` modules
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7. The `publisher` and `synchronizer` modules
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This is important to notice in order to avoid circular dependencies. For instance, if an `Extension` is declared with the `core` module as a dependency, RequireJS will inject `undefined` instead of the actual module.
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Any module though can access any dependencies by implementing the proper [injection listener][13] provided by the `eventMgr`.
----------
### core
The `core` module is responsible for:
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- creating the [UI Layout][14], the [ACE][15] editor and the [PageDown][16] editor,
- loading/saving the settings,
- running periodic tasks,
- detecting the user activity,
- checking the offline status.
**Attributes:**
- `isOffline`: indicates the offline status of the application.
**Methods:**
- `onReady(callback)`: sets a callback to be called when all modules have been loaded and the DOM is ready.
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> **NOTE:** This is preferred over [jQuery's `.ready()`][17] because it ensures that all AMD modules are loaded by [RequireJS][18].
- `runPeriodically(callback)`: sets a callback to be called every second.
> **NOTE:** The callback will not run if the user is inactive or in StackEdit Viewer. User is considered inactive after 5 minutes of inactivity (mouse or keyboard).
- `setOffline()`: can be called by any other modules when a network timeout occurs for instance.
> **NOTE:** the offline status is also set by detecting the window `offline` event. `core.isOffline` is automatically set to `false` when the network is recovered.
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- `initEditor(fileDesc)`: creates or refreshes the [PageDown][19] editor with a given [`FileDescriptor`][20] object.
----------
### fileMgr
The `fileMgr` module is responsible for:
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- creating and deleting local files,
- switching from one file to another.
**Attributes:**
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- `currentFile`: the [`FileDescriptor`][21] object that is currently edited.
**Methods:**
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- `createFile(title, content)`: creates a [`FileDescriptor`][22] object, add it in the [`fileSystem`][23] map and returns it.
- `deleteFile(fileDesc)`: deletes a [`FileDescriptor`][24] object from the [`fileSystem`][25] map.
- `selectFile(fileDesc)`: selects a [`FileDescriptor`][26] object for editing.
#### FileDescriptor
The `FileDescriptor` class represents a local file. A `FileDescriptor` object has the following properties:
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- `fileIndex`: the unique string index of the file in the file system.
- `title`: the title of the document.
- `content`: the content of the document.
- `syncLocations`: a map containing all the associated [`syncAttributes`][27] objects with their `syncIndex` as a key.
- `publishLocations`: a map containing all the associated [`publishAttributes`][28] objects with their `publishIndex` as a key.
And the following methods:
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- `addSyncLocation(syncAttributes)`: associates a [`syncAttributes`][29] object with the file.
- `removeSyncLocation(syncAttributes)`: unassociates a [`syncAttributes`][30] object with the file.
- `addPublishLocation(publishAttributes)`: associates a [`publishAttributes`][31] object with the file.
- `removePublishLocation(publishAttributes)`: unassociates a [`publishAttributes`][32] object with the file.
#### fileSystem
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The `fileSystem` module is a map containing all the [`FileDescriptor`][33] objects with their `fileIndex` as a key.
----------
### synchronizer
The `synchronizer` module is responsible for:
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- creating a new local file from a sync location (import).
- creating a new sync location from a local file (export).
- running 2 ways synchronization (upload and download) for all sync locations.
#### synchronizer's providers
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A [`provider`][34] module can be associated with the `synchronizer` module if it implements the following functions:
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- `importFiles()`: downloads one or multiple files and create local files associated with the sync locations.
- `exportFile()`: uploads a local file to a new sync location.
- `syncDown()`: performs a download of all the changes operated on all sync locations.
- `syncUp()`: performs an upload of a change to a sync location.
#### syncAttributes
A `syncAttributes` object is an object that describes a sync location. Attributes differ from one provider to another except for the following:
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- `syncIndex`: the unique string index of the publish location.
- `provider`: the [`provider`][35] module that handles the sync location.
----------
### publisher
The `publisher` module is responsible for:
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- creating new publish locations,
- updating existing publish locations.
#### publisher's providers
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A [`provider`][36] module can be associated with the `publisher` module if it implements the following functions:
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- `newPublishAttributes()`: returns a new [`publishAttributes`][37] object in order to create a new publish location.
- `publish()`: performs publishing of one publish location.
#### publishAttributes
A `publishAttributes` object is an object that describes a publish location. Attributes differ from one provider to another except for the following:
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- `publishIndex`: the unique string index of the publish location.
- `provider`: the [`provider`][38] module that handles the publish location.
- `format`: the publishing format for the publish location. It can be:
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- `markdown` for Markdown format.
- `html` for HTML format.
- `template` for template format.
----------
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### eventMgr
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The `eventMgr` module is responsible for receiving and dispatching events. Below is the list of all events signatures.
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Most events (those that are not triggered by the `eventMgr` module) can be triggered by calling methods of the same name in the `eventMgr` module. For example:
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```js
eventMgr.onMessage('StackEdit is awesome!');
```
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The method `addListener(eventName, callback)` of the `eventMgr` module can be used to listen to these events (except those that can only be handled by `Extension` modules). For example:
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```js
eventMgr.addListener('onMessage', function(message) {
alert(message);
});
```
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`Extension` modules have the possibility to listen to those events by implementing methods of the same name. For example:
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```js
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myExtension.onMessage = function(message) {
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alert(message);
};
```
----------
#### Core events
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- **`onReady()`**
All the modules are loaded and the DOM is ready.
> Triggered by the `core` module.
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> This is preferred over [jQuery's `.ready()`][39] because it ensures that all modules have been loaded by RequireJS.
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- **`onMessage(message)`**
A message destined to the user has been produced.
- `message`: the text string of the message.
- **`onError(error)`**
An error has been thrown.
- `error`: an error object or a string.
- **`onOfflineChanged(isOffline)`**
The off-line status has changed.
- `isOffline`: the off-line status.
> Triggered by the `core` module.
- **`onUserActive()`**
The user has just moved the mouse or pressed the keyboard.
> Triggered by the `core` module.
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- **`onAsyncRunning(isRunning)`**
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Some asynchronous tasks have just started or stopped.
- `isRunning`: true if started, false if stopped.
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> Triggered by the `AsyncTask` module.
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- **`onPeriodicRun()`**
A hook that is called periodically (every 1 second if user is active).
> Triggered by the `core` module.
- **`onLoadSettings()`**
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A hook that is called when the settings dialog has to be refreshed. Every `Extension` module that has configuration inputs in the settings dialog has to implement a listener for this event.
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> Triggered by the `core` module. Only `Extension` modules can handle this event.
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- **`onSaveSettings(newConfig, event)`**
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A hook that is called when the settings dialog has to be validated. Every `Extension` module that has configuration inputs in the settings dialog has to implement a listener for this event.
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- `newConfig`: the new configuration object, deduced from the settings dialog inputs.
- `event`: the submit event object. `stopPropagation` has to be called in case of an error when parsing settings dialog inputs.
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> Triggered by the `core` module. Only `Extension` modules can handle this event.
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- **`onInit()`**
A hook allowing enabled extensions to initialize.
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> Triggered by the `eventMgr` module. Only `Extension` modules can handle this event.
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> This event is triggered before `onReady` event and just after the `config` and `enabled` extensions properties have been set by the `eventMgr`.
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----------
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#### Module injection events
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- **`onFileMgrCreated(fileMgr)`**
The `fileMgr` module has been created.
- `fileMgr`: the `fileMgr` module.
> Triggered by the `fileMgr` module.
- **`onSynchronizerCreated(synchronizer)`**
The `synchronizer` module has been created.
- `synchronizer`: the `synchronizer` module.
> Triggered by the `synchronizer` module.
- **`onPublisherCreated(publisher)`**
The `publisher` module has been created.
- `publisher`: the `publisher` module.
> Triggered by the `publisher` module.
- **`onEventMgrCreated()`**
The `eventMgr` module has been created.
- `eventMgr`: the `eventMgr` module.
> Triggered by the `eventMgr` module.
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----------
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#### file operation events
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- **`onFileCreated(fileDesc)`**
A [`FileDescriptor`][41] object has been created.
- `fileDesc`: the [`FileDescriptor`][42] object.
> Triggered by the `fileMgr` module.
- **`onFileDeleted(fileDesc)`**
A [`FileDescriptor`][43] object has been removed from the `fileSystem` module.
- `fileDesc`: the [`FileDescriptor`][44] object.
> Triggered by the `fileMgr` module.
- **`onFileSelected(fileDesc)`**
A [`FileDescriptor`][45] object has been selected.
- `fileDesc`: the [`FileDescriptor`][46] object.
> Triggered by the `fileMgr` module. This event is triggered before `onFileClosed` (if another document is open) and `onFileOpen` events.
- **`onFileClosed(fileDesc)`**
The current [`FileDescriptor`][47] object is about to be detached from the editor.
- `fileDesc`: the [`FileDescriptor`][48] object.
> Triggered by the `fileMgr` module. This event is triggered after `onFileSelected` event and before `onFileClosed` event.
- **`onFileOpen(fileDesc)`**
The selected [`FileDescriptor`][49] object has been attached to the editor.
- `fileDesc`: the [`FileDescriptor`][50] object.
> Triggered by the `fileMgr` module. This event is triggered after `onFileSelected` and `onFileClosed` (if another document is open) events.
- **`onContentChanged(fileDesc)`**
The content of a [`FileDescriptor`][51] object has been modified.
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- `fileDesc`: the [`FileDescriptor`][52] object.
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- **`onTitleChanged(fileDesc)`**
The content of a [`FileDescriptor`][53] object has been modified.
- `fileDesc`: the [`FileDescriptor`][54] object.
- **`onFoldersChanged()`**
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The folders structure has changed.
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----------
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#### Sync events
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- **`onSyncRunning(isRunning)`**
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A synchronization job has just started or stopped.
- `isRunning`: true if started, false if stopped.
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> Triggered by the `synchronizer` module.
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> A synchronization job is the action to download and upload all detected changes for all sync locations of all documents.
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- **`onSyncSuccess()`**
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A synchronization job has successfully finished.
> Triggered by the `synchronizer` module.
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> A synchronization job is the action to download and upload all detected changes for all sync locations of all documents.
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- **`onSyncImportSuccess(fileDescList, provider)`**
The import of documents has successfully finished.
- `fileDescList`: the list of [`FileDescriptor`][55] objects that have been created.
- `provider`: the [`provider`][56] module that handled the import.
> Triggered by the [`provider`][57] module that handled the import.
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> An import is the action to download multiple files and to create, for each, one [`FileDescriptor`][55] objects with one sync location.
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- **`onSyncExportSuccess(fileDesc, syncAttributes)`**
The export of one document has successfully finished.
- `fileDesc`: the [`FileDescriptor`][58] object that has been exported.
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- `syncAttributes`: the descriptor object of the new sync location.
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> Triggered by the `synchronizer` module.
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> An export is the action to upload one file and to create one new sync location associated with one existing `FileDescriptor`][55] object.
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- **`onSyncRemoved(fileDesc, syncAttributes)`**
A sync location has been removed from a [`FileDescriptor`][59] object.
- `fileDesc`: the [`FileDescriptor`][60] object.
- `syncAttributes`: the descriptor object of the removed sync location.
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----------
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#### Publish events
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- **`onPublishRunning(isRunning)`**
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A document publication job has just started or stopped.
- `isRunning`: true if started, false if stopped.
> Triggered by the `publisher` module.
> A publication job is the action to upload changes on multiple publish locations associated with one `FileDescriptor`][55] object.
- **`onPublishSuccess(fileDesc)`**
A document publication job has successfully finished.
- `fileDesc`: the [`FileDescriptor`][60] object that has been published.
> Triggered by the `publisher` module.
> A publication job is the action to upload changes on multiple publish locations associated with one `FileDescriptor`][55] object.
- **`onNewPublishSuccess(fileDesc, publishAttributes)`**
A new publish location has been successfully created.
- `fileDesc`: the [`FileDescriptor`][60] object that has been published.
- `publishAttributes`: the descriptor object of the new publish location.
> Triggered by the `publisher` module.
- **`onPublishRemoved(fileDesc, publishAttributes)`**
A publish location has been removed from a [`FileDescriptor`][59] object.
- `fileDesc`: the [`FileDescriptor`][60] object.
- `publishAttributes`: the descriptor object of the removed publish location.
> Triggered by the `publisher` module.
----------
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#### UI Layout events
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- **`onLayoutConfigure(layoutConfig)`**
The layout is about to be configured.
- `layoutConfig`: the configuration object of the UI Layout library.
> Triggered by the `core` module.
- **`onLayoutCreated(layout)`**
The layout has just been created.
- `layout`: the layout object of the UI Layout library.
> Triggered by the `core` module.
- **`onLayoutResize(paneName)`**
One pane of the layout has been resized.
- `paneName`: the name of the resized layout pane.
> Triggered by the `core` module.
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- **`onCreateButton()`**
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Allows extensions to add their own buttons in the navigation bar. Implemented listeners have to return an HTML button element. For example:
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myExtension.onCreateButton = function() {
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var button = $('<button class="btn btn-success"><i class="icon-rocket"></i></button>');
button.click(function() {
eventMgr.onMessage('Booom!');
});
return button[0];
};
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> Triggered by the `eventMgr` module. Only `Extension` modules can handle this event.
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- **`onCreateEditorButton()`**
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Allows extensions to add their own buttons in the side bar. Implemented listeners have to return an HTML button element. See `onCreateButton` for a concrete example.
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> Triggered by the `eventMgr` module. Only `Extension` modules can handle this event.
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- **`onCreatePreviewButton()`**
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Allows extensions to add their own buttons over the preview. Implemented listeners have to return an HTML button element. See `onCreateButton` for a concrete example.
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> Triggered by the `eventMgr` module. Only `Extension` modules can handle this event.
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----------
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#### PageDown events
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- **`onPagedownConfigure(editor)`**
The Pagedown editor is about to be created.
- `editor`: the Pagedown editor object before `run` has been called.
> Triggered by the `core` module.
- **`onAsyncPreview(callback)`**
Called after Pagedown's synchronous rendering to trigger extra asynchronous rendering (such as MathJax). Implemented listeners have to call the callback parameter after processing in order other `onAsyncPreview` listeners to run.
- `callback`: the callback to call at the end of the asynchronous processing.
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> Triggered by the `eventMgr` module. Only `Extension` modules can handle this event.
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- **`onPreviewFinished(html)`**
Called after every `onAsyncPreview` listeners have been called.
- `html`: the finally rendered HTML.
- **`onSectionsCreated(sectionList)`**
The Markdown has been split into sections before rendering.
- `sectionList`: the list of section objects. Each section object contains:
- `text`: the markdown substring contained in the section.
- `textWithDelimiter`: the text with an added delimiter.
> Triggered by the `markdownSectionParser` extension.
- **`onMarkdownTrim(offset)`**
The Markdown has been left trimmed by a certain number of character.
- `offset`: the number of characters that have been removed.
> Triggered by the `yamlFrontMatterParser` extension.
----------
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#### ACE events
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- **`onAceCreated(aceEditor)`**
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The ACE editor has just been created.
- `aceEditor`: the ACE editor object.
> Triggered by the `core` module.
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> Written with [StackEdit](https://stackedit.io/).
[1]: http://git-scm.com/
[2]: http://nodejs.org/
[3]: http://gruntjs.com/
[4]: http://bower.io/
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[5]: http://requirejs.org/ "RequireJS"
[6]: http://en.wikipedia.org/wiki/Asynchronous_module_definition "Asynchronous module definition"
[7]: http://bower.io/
[8]: http://requirejs.org/ "RequireJS"
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[9]: https://github.com/benweet/stackedit-wordpress-proxy
[10]: https://github.com/benweet/stackedit-tumblr-proxy
[11]: https://github.com/prose/gatekeeper
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[12]: https://lh6.googleusercontent.com/-sr6zRtyaoUk/Un5qSakOzPI/AAAAAAAAFC0/oI5If5fI9Gw/s0/StackEdit%252520architecture%252520-%252520New%252520Page%252520%2525283%252529.png "StackEdit architecture"
[13]: #module-injection
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[14]: http://layout.jquery-dev.net/ "UI Layout"
[15]: http://ace.c9.io
[16]: https://code.google.com/p/pagedown/ "PageDown"
[17]: http://api.jquery.com/ready/
[18]: http://requirejs.org/ "RequireJS"
[19]: https://code.google.com/p/pagedown/ "PageDown"
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[20]: #filedescriptor
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[21]: #filedescriptor
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[22]: #filedescriptor
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[23]: #filesystem
[24]: #filedescriptor
[25]: #filesystem
[26]: #filedescriptor
[27]: #syncattributes
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[28]: #publishattributes
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[29]: #syncattributes
[30]: #syncattributes
[31]: #publishattributes
[32]: #publishattributes
[33]: #filedescriptor
[34]: #provider
[35]: #provider
[36]: #provider
[37]: #publishattributes
[38]: #provider
[39]: http://api.jquery.com/ready/
[40]: http://requirejs.org/ "RequireJS"
[41]: #filedescriptor
[42]: #filedescriptor
[43]: #filedescriptor
[44]: #filedescriptor
[45]: #filedescriptor
[46]: #filedescriptor
[47]: #filedescriptor
[48]: #filedescriptor
[49]: #filedescriptor
[50]: #filedescriptor
[51]: #filedescriptor
2013-11-23 18:59:55 +00:00
[52]: #filedescriptor
[53]: #filedescriptor
[54]: #filedescriptor
[55]: #filedescriptor
[56]: #provider
[57]: #provider
[58]: #filedescriptor
[59]: #filedescriptor
[60]: #filedescriptor