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== ECMA Script Interaction With The Plasma Desktop Shell (plasma-desktop) ==
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{{Moved To Userbase}}
 
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It is possible to control and interact with a plasma-desktop session using ECMA Script (aka JavaScript). This scripting mechanism exposes containments (Desktop Activities and Panels), widgets and various other aspects of plasma-desktop configuration using the widely known and used ECMA Script language. The QtScript engine is used for the runtime environment.
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This document describes the API that is provided along with how to
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run such scripts in plasma-desktop.
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== Running Scripts ==
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There are three ways that scripts can be executed in plasma-desktop:
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* '''on first run''': when plasma-desktop is started without any pre-existing configuration, any scripts in $APPDATA/plasma-desktop/init/ with a ".js" suffix are run. If there is more than one script, they are run sequentially in the alphabetical order of the file names.
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{{note|For security reasons, scripts located in the user's home directory will '''not''' be run during this phase.}}}
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* '''on update''': when plasma-desktop is started, it will check in
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  `kde4-config --path data`/plasma-desktop/updates/ with a ".js" suffix for scripts that have not yet been run. If there is more than one script which has not been run yet they will be executed serially in the alphabetical order of the file names.
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A record of which update scripts have been run is kept in the application's config file in the [Updates] group. This means that if the plasma-desktop configuraiton file is removed, all the update scripts will be run again.
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{{note|For security reasons, scripts located in the user's home directory will '''not''' be run during this phase.}}}
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* '''interactively''': an interactive scripting dialog can be requested either via the KRunner window (Alt+F2, by default, or via the "Run Command" entry in various desktop menus) by entering "desktop console" as the search term. It can also be triggered directly via dbus with <code bash>qdbus org.kde.plasma-desktop /MainApplication showInteractiveConsole</code>
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:ECMA Script may be entered directly into this window for execution and output appears in the lower half of the window. Ctrl+E is a shortcut to run scripts, and scripts can be saved to and loaded from disk.
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:Scripts from files can also be loaded using KRunner with "desktop console /path/to/file" or via dbus with
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<code bash>qdbus org.kde.plasma-desktop /MainApplication loadScriptInInteractiveConsole /path/to/file</code>
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== API ==
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In addition to the normal ECMA Script API and the Qt-specific extensions (such as signal/slot support) provided by QtScript, the following API is provided for use by scripts.
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All of the API below, unless otherwise noted with a version noticed, appear as below in the KDE Software Compilation v4.4.0 and later. API that is not noted as being part of a given class or object is part of the global namespace.
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{{note|API compatibility is guaranteed from version to version starting with KDE Software Compilation v4.4.0.}}
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=== Activities ===
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Activities are the desktop layer in a plasma-desktop session and may contain widgts. In sightly more technical terms, they are desktop containments. Activities can be created, enumerated, modified and destroyed.
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New Activities can be created using the Activity constructor, like this:
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    var activity = new Activity("folderview")
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The string passed into the constructor maps to the X-KDE-PluginInfo-Name= entry
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in the plugin's .desktop file). See the documentation on the Containment object class below.
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Read-only properties:
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* ''Array[number]'' '''activityIds''': returns a list of integer ids of all existing Plasma activities
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Functions:
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* ''Activity'' '''activityById(number id)''': return an object representing the activity with the given id
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* ''Activity'' '''activityForScreen(number screen[, number dekstop])''': returns an object representing the activity  currently associated with the given screen and, optionally, the given desktop.
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=== Panels ===
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Panels can be created, enumerated, modified and destroyed. A panel object combines both a containment as well as the container itself, allowing for full control of things such as where it appears on screen and the hiding features associated with them.
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New Panels can be created using the Panel constructor, like this:
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    var panel = new Panel("dock")
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The string passed into the constructor maps to the X-KDE-PluginInfo-Name= entry
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in the plugin's .desktop file).
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Read-only properties:
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* ''Array[number]'' '''panelIds''': returns a list of integer ids of all existing Plasma panels
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Functions:
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* ''Panel'' '''panelById(int id)''': returns an object representing the Panel that matches the given id
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=== Activities and Panels ===
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Activity and Panel objects, ones created by the script, or as returned by activityById, activityForScreen,
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or panelById) provide the following read-only properties:
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* ''number'' '''id: the integer id of this activity
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* ''String'' '''formFactor''': returns the form factor of the activity, e.g. "planar" for most desktop activities,"mediacenter" for media centers and either "horizontal" or "vertical" for panels.
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* ''Array[number]'' '''widgetIds''': a list of integer ids of all the widgets in this Activity
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as well as the following read/write properties:
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* ''number'' '''desktop''': the virtual desktop this activity is associated with, or -1 for none
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* ''number'' '''screen''': the screen this activity is associated with, or -1 for none
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* ''String'' '''name''': the name of this activity
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and the following methods:
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* '''remove()''': deletes this activity and all widgets inside of it
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* ''Widget'' '''widgetById(number id)''': returns an object representing the widget with the given id
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* ''Widget'' '''addWidget(String name)''': adds a new widget to the activity; the name maps to the X-KDE-PluginInfo-Name= entry
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  in the widget's .desktop file
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* ''Widget'' '''addWidget(Widget widget)''': adds an existing widget to this activity; useful for moving widgets between Activities and Panels
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* '''showConfigurationInteface()''': shows the configuration user interface for this Activity or Panel on the screen
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In addition to all of the above properties and functions, Panel objects also provide the folowing read/write properties:
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* ''number'' '''length''': the number of pixels along the screen edge used
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* ''number'' '''height''': the height (or for vertical panels, the width) of the panel
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* ''String'' '''hiding''': the hiding mode of the panel, one of "none" (for no hiding), "autohide", "windowscover" or "windowsbelow"
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* ''String'' '''alignment''': right, left or center alignment of the panel (for vertical panels, right corrsponds to top and left to bottom)
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* ''String'' '''location''': returns the location of the activity (only relevant for Panels); valid values include "top", "bottom", "left", "right" and "floating"
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=== Widgets ===
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Widgets may be enumerated by calling the widgetIds property on a Activity or Panel object. With a widget id in hand, a Widget object can be retrieved by calling widgetById(id) on an Activity or Panel object. New Widgets can be created with add addWidget(String) function provided by Activity and Panel objects.
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A Widget object provides the following read-only properties:
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* ''number'' '''id''': the id of the widget
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* ''String'' '''type''': the plugin type of this widget
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* ''Array[String]'' '''configKeys''': a list of all keys that are set in the current configuration
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* ''Array[String]'' '''configGroups''': a list of all the groups in the current configuration
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* ''number'' '''index''': the layout index of the widget; in a Panel this corresponds to the order in appears in
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as well as the following read-write properties:
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* ''QRectF'' '''geometry''': the geometry of the widget (settable)
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* ''String'' '''globalShortcut''': the shortcut sequence (in the format used by QKeySequence, e.g. "Alt+F1") associated with this widget
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* ''Array[String]'' '''currentConfigGroup''': the current configuration group path, with each entry in the array representing a sub-group. This allows one to access trees of groups with code such as: widget.currentConfigGroup = new Array('topGroup', 'subGroupOfTopGroup'). An empty Array means the default (top-level) configuration group for the widget
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and methods:
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* '''remove()''': deletes this widget
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* '''readConfig(String key, any default)''': reads the value of key in the config with default
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  for the default value
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* '''writeConfig(String key, any value)''': sets key to value in the config
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* '''showConfigurationInteface()''': shows the configuration user interface for this widget on the screen
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=== Screen Geometry ===
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Read-only properties:
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* ''number'' '''screenCount''': returns the number of screens connected to the computer
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Functions:
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* ''QRectF'' '''screenGeometry(number screen)''': returns a rect object representing the geometry of a screen
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=== Misc. Global Properties and Functions ===
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Read-write properties:
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* ''bool'' '''locked''': whether the desktop shell and widgets are locked or not (settable)
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Read-only property:
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* ''boolean'' '''hasBattery''': whether or not the system has the ability to run on battery power, e.g. a laptop or mobile device
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Functions:
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* '''sleep(number ms)''': sleeps the script for the specified number of millseconds
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=== QRectF ===
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A rectangle class is also provided for use with Widget, Panel and screen geometry properties and functions.
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Read-only properites:
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* ''boolean'' '''empty''': true if the rectangle's width or height is less than, or equal to, 0; an empty rectangle is also invalid
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* ''boolean'' '''null''': true if the rectangle has both the width and the height set to 0; a null rectangle is also empty and not valid
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* ''boolean'' '''valid''':  true if the rectangle has a width > 0 and height 0.
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Read-write properties:
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* ''number'' '''left'''
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* ''number'' '''top'''
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* ''number'' '''bottom'''
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* ''number'' '''right'''
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* ''number'' '''height'''
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* ''number'' '''width'''
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* ''number'' '''x'''
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* ''number'' '''y'''
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Constructors:
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* '''QRectF'''
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* '''QRectF(number x, number y, number width, number height)''': Sets the coordinates of the rectangle's top-left corner to (x, y), and its size to the given width and height.
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Functions:
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* '''adjust(number dx1, number dy1, number dx2, number dy2)''': adds dx1, dy1, dx2 and dy2 respectively to the existing coordinates of the rectangle
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* ''QRectF'' '''adjusted(number dx1, number dy1, number dx2, number dy2)''': returns a new QRectF with dx1, dy1, dx2 and dy2 added respectively to the existing coordinates of the rectangle
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* '''translate(number dx, number dy)''': translates the rect by dx, dy
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* '''setCoords(number x1, number y1, number x2, number y2)''': sets the coordinates of the rectangle's top-left corner to (x1, y1), and the coordinates of its bottom-right corner to (x2, y2).
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* '''setRect(number x, number y, number width, number height)''': sets the coordinates of the rectangle's top-left corner to (x, y), and its size to the given width and height.
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* ''boolean'' '''contains(number x, number y)''': returns true if the rect contains the point (x, y)
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* '''moveBottom(number delta)'': moves the bottom by delta pixels
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* '''moveLeft(number delta)''': moves the left by delta pixels
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* '''moveRight(number delta)''': moves the right by delta pixels
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* '''moveTo(number x, number y)''': moves the top left of the rect to point (x, y)
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* '''moveTop(number delta)''': moves the top by delta pixels
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Latest revision as of 13:24, 11 March 2016

This page is now on the Userbase wiki.


This page was last modified on 11 March 2016, at 13:24. Content is available under Creative Commons License SA 4.0 unless otherwise noted.