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= Gerrit Code Review - PolyGerrit Plugin Development
CAUTION: Work in progress. Hard hat area. Please
link:https://bugs.chromium.org/p/gerrit/issues/entry?template=PolyGerrit%20plugins[send
feedback,role=external,window=_blank] if something's not right.
For migrating existing GWT UI plugins, please check out the
link:pg-plugin-migration.html#migration[migration guide].
[[loading]]
== Plugin loading and initialization
link:js-api.html#_entry_point[Entry point] for the plugin and the loading method
is based on link:http://w3c.github.io/webcomponents/spec/imports/[HTML Imports,role=external,window=_blank]
spec.
* The plugin provides pluginname.html, and can be a standalone file or a static
asset in a jar as a link:dev-plugins.html#deployment[Web UI plugin].
* pluginname.html contains a `dom-module` tag with a script that uses
`Gerrit.install()`. There should only be single `Gerrit.install()` per file.
* PolyGerrit imports pluginname.html along with all required resources defined in it
(fonts, styles, etc).
* For standalone plugins, the entry point file is a `pluginname.html` file
located in `gerrit-site/plugins` folder, where `pluginname` is an alphanumeric
plugin name.
Note: Code examples target modern browsers (Chrome, Firefox, Safari, Edge).
Here's a recommended starter `myplugin.html`:
``` html
<dom-module id="my-plugin">
<script>
Gerrit.install(plugin => {
'use strict';
// Your code here.
});
</script>
</dom-module>
```
[[low-level-api-concepts]]
== Low-level DOM API concepts
Basically, the DOM is the API surface. Low-level API provides methods for
decorating, replacing, and styling DOM elements exposed through a set of
link:pg-plugin-endpoints.html[endpoints].
PolyGerrit provides a simple way for accessing the DOM via DOM hooks API. A DOM
hook is a custom element that is instantiated for the plugin endpoint. In the
decoration case, a hook is set with a `content` attribute that points to the DOM
element.
1. Get the DOM hook API instance via `plugin.hook(endpointName)`
2. Set up an `onAttached` callback
3. Callback is called when the hook element is created and inserted into DOM
4. Use element.content to get UI element
``` js
Gerrit.install(plugin => {
const domHook = plugin.hook('reply-text');
domHook.onAttached(element => {
if (!element.content) { return; }
// element.content is a reply dialog text area.
});
});
```
[[low-level-decorating]]
=== Decorating DOM Elements
For each endpoint, PolyGerrit provides a list of DOM properties (such as
attributes and events) that are supported in the long-term.
``` js
Gerrit.install(plugin => {
const domHook = plugin.hook('reply-text');
domHook.onAttached(element => {
if (!element.content) { return; }
element.content.style.border = '1px red dashed';
});
});
```
[[low-level-replacing]]
=== Replacing DOM Elements
An endpoint's contents can be replaced by passing the replace attribute as an
option.
``` js
Gerrit.install(plugin => {
const domHook = plugin.hook('header-title', {replace: true});
domHook.onAttached(element => {
element.appendChild(document.createElement('my-site-header'));
});
});
```
[[low-level-style]]
=== Styling DOM Elements
A plugin may provide Polymer's
https://www.polymer-project.org/2.0/docs/devguide/style-shadow-dom#style-modules[style
modules,role=external,window=_blank] to style individual endpoints using
`plugin.registerStyleModule(endpointName, moduleName)`. A style must be defined
as a standalone `<dom-module>` defined in the same .html file.
Note: TODO: Insert link to the full styling API.
``` html
<dom-module id="my-plugin">
<script>
Gerrit.install(plugin => {
plugin.registerStyleModule('change-metadata', 'some-style-module');
});
</script>
</dom-module>
<dom-module id="some-style-module">
<style>
html {
--change-metadata-label-status: {
display: none;
}
--change-metadata-strategy: {
display: none;
}
}
</style>
</dom-module>
```
[[high-level-api-concepts]]
== High-level DOM API concepts
High level API is based on low-level DOM API and is essentially a standardized
way for doing common tasks. It's less flexible, but will be a bit more stable.
The common way to access high-level API is through `plugin` instance passed
into setup callback parameter of `Gerrit.install()`, also sometimes referred to
as `self`.
[[low-level-api]]
== Low-level DOM API
The low-level DOM API methods are the base of all UI customization.
=== attributeHelper
`plugin.attributeHelper(element)`
Alternative for
link:https://www.polymer-project.org/1.0/docs/devguide/data-binding[Polymer data
binding,role=external,window=_blank] for plugins that don't use Polymer. Can be used to bind element
attribute changes to callbacks.
See `samples/bind-parameters.html` for examples on both Polymer data bindings
and `attibuteHelper` usage.
=== eventHelper
`plugin.eventHelper(element)`
Note: TODO
=== hook
`plugin.hook(endpointName, opt_options)`
See list of supported link:pg-plugin-endpoints.html[endpoints].
Note: TODO
=== registerCustomComponent
`plugin.registerCustomComponent(endpointName, opt_moduleName, opt_options)`
See list of supported link:pg-plugin-endpoints.html[endpoints].
Note: TODO
=== registerDynamicCustomComponent
`plugin.registerDynamicCustomComponent(dynamicEndpointName, opt_moduleName,
opt_options)`
See list of supported link:pg-plugin-endpoints.html[endpoints].
Note: TODO
=== registerStyleModule
`plugin.registerStyleModule(endpointName, moduleName)`
Note: TODO
[[high-level-api]]
== High-level API
Plugin instance provides access to number of more specific APIs and methods
to be used by plugin authors.
=== admin
`plugin.admin()`
.Params:
- none
.Returns:
- Instance of link:pg-plugin-admin-api.html[GrAdminApi].
=== changeReply
`plugin.changeReply()`
Note: TODO
=== delete
`plugin.delete(url, opt_callback)`
Note: TODO
=== get
`plugin.get(url, opt_callback)`
Note: TODO
=== getPluginName
`plugin.getPluginName()`
Note: TODO
=== getServerInfo
`plugin.getServerInfo()`
Note: TODO
=== on
`plugin.on(eventName, callback)`
Note: TODO
=== panel
`plugin.panel(extensionpoint, callback)`
Deprecated. Use `plugin.registerCustomComponent()` instead.
``` js
Gerrit.install(function(self) {
self.panel('CHANGE_SCREEN_BELOW_COMMIT_INFO_BLOCK', function(context) {
context.body.innerHTML =
'Sample link: <a href="http://some.com/foo">Foo</a>';
context.show();
});
});
```
Here's the recommended approach that uses Polymer for generating custom elements:
``` html
<dom-module id="some-plugin">
<script>
Gerrit.install(plugin => {
plugin.registerCustomComponent(
'change-view-integration', 'some-ci-module');
});
</script>
</dom-module>
<dom-module id="some-ci-module">
<template>
Sample link: <a href="http://some.com/foo">Foo</a>
</template>
<script>
Polymer({is: 'some-ci-module'});
</script>
</dom-module>
```
Here's a minimal example that uses low-level DOM Hooks API for the same purpose:
``` js
Gerrit.install(plugin => {
plugin.hook('change-view-integration', el => {
el.innerHTML = 'Sample link: <a href="http://some.com/foo">Foo</a>';
});
});
```
=== popup
`plugin.popup(moduleName)`
Note: TODO
=== post
`plugin.post(url, payload, opt_callback)`
Note: TODO
[[plugin-rest-api]]
=== restApi
`plugin.restApi(opt_prefix)`
.Params:
- (optional) URL prefix, for easy switching into plugin URL space,
e.g. `changes/1/revisions/1/cookbook~say-hello`
.Returns:
- Instance of link:pg-plugin-rest-api.html[GrPluginRestApi].
[[plugin-repo]]
=== repo
`plugin.repo()`
.Params:
- none
.Returns:
- Instance of link:pg-plugin-repo-api.html[GrRepoApi].
=== put
`plugin.put(url, payload, opt_callback)`
Note: TODO
=== screen
`plugin.screen(screenName, opt_moduleName)`
.Params:
- `*string* screenName` URL path fragment of the screen, e.g.
`/x/pluginname/*screenname*`
- `*string* opt_moduleName` (Optional) Web component to be instantiated for this
screen.
.Returns:
- Instance of GrDomHook.
=== screenUrl
`plugin.url(opt_screenName)`
.Params:
- `*string* screenName` (optional) URL path fragment of the screen, e.g.
`/x/pluginname/*screenname*`
.Returns:
- Absolute URL for the screen, e.g. `http://localhost/base/x/pluginname/screenname`
[[plugin-settings]]
=== settings
`plugin.settings()`
.Params:
- none
.Returns:
- Instance of link:pg-plugin-settings-api.html[GrSettingsApi].
=== settingsScreen
`plugin.settingsScreen(path, menu, callback)`
Deprecated. Use link:#plugin-settings[`plugin.settings()`] instead.
[[plugin-styles]]
=== styles
`plugin.styles()`
.Params:
- none
.Returns:
- Instance of link:pg-plugin-styles-api.html[GrStylesApi]
=== changeMetadata
`plugin.changeMetadata()`
.Params:
- none
.Returns:
- Instance of link:pg-plugin-change-metadata-api.html[GrChangeMetadataApi].
=== theme
`plugin.theme()`
Note: TODO
=== url
`plugin.url(opt_path)`
Note: TODO
[[deprecated-api]]
== Deprecated APIs
Some of the deprecated APIs have limited implementation in PolyGerrit to serve
as a "stepping stone" to allow gradual migration.
=== install
`plugin.deprecated.install()`
.Params:
- none
Replaces plugin APIs with a deprecated version. This allows use of deprecated
APIs without changing JS code. For example, `onAction` is not available by
default, and after `plugin.deprecated.install()` it's accessible via
`self.onAction()`.
=== onAction
`plugin.deprecated.onAction(type, view_name, callback)`
.Params:
- `*string* type` Action type.
- `*string* view_name` REST API action.
- `*function(actionContext)* callback` Callback invoked on action button click.
Adds a button to the UI with a click callback. Exact button location depends on
parameters. Callback is triggered with an instance of
link:#deprecated-action-context[action context].
Support is limited:
- type is either `change` or `revision`.
See link:js-api.html#self_onAction[self.onAction] for more info.
=== panel
`plugin.deprecated.panel(extensionpoint, callback)`
.Params:
- `*string* extensionpoint`
- `*function(screenContext)* callback`
Adds a UI DOM element and triggers a callback with context to allow direct DOM
access.
Support is limited:
- extensionpoint is one of the following:
* CHANGE_SCREEN_BELOW_COMMIT_INFO_BLOCK
* CHANGE_SCREEN_BELOW_CHANGE_INFO_BLOCK
See link:js-api.html#self_panel[self.panel] for more info.
=== settingsScreen
`plugin.deprecated.settingsScreent(path, menu, callback)`
.Params:
- `*string* path` URL path fragment of the screen for direct link.
- `*string* menu` Menu item title.
- `*function(settingsScreenContext)* callback`
Adds a settings menu item and a section in the settings screen that is provided
to plugin for setup.
See link:js-api.html#self_settingsScreen[self.settingsScreen] for more info.
[[deprecated-action-context]]
=== Action Context (deprecated)
Instance of Action Context is passed to `onAction()` callback.
Support is limited:
- `popup()`
- `hide()`
- `refresh()`
- `textfield()`
- `br()`
- `msg()`
- `div()`
- `button()`
- `checkbox()`
- `label()`
- `prependLabel()`
- `call()`
See link:js-api.html#ActionContext[Action Context] for more info.