Copyright © 2008-2013 Kristian Høgsberg Copyright © 2013 Rafael Antognolli Copyright © 2013 Jasper St. Pierre Copyright © 2010-2013 Intel Corporation Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice (including the next paragraph) shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. xdg_shell allows clients to turn a wl_surface into a "real window" which can be dragged, resized, stacked, and moved around by the user. Everything about this interface is suited towards traditional desktop environments. Destroy this xdg_shell object. Destroying a bound xdg_shell object while there are surfaces still alive created by this xdg_shell object instance is illegal and will result in a protocol error. This creates an xdg_surface for the given surface. While xdg_surface itself is not a role, the corresponding surface may only be assigned a role extending xdg_surface, such as xdg_toplevel or xdg_popup. This creates an xdg_surface for the given surface. An xdg_surface is used as basis to define a role to a given surface, such as xdg_toplevel or xdg_popup. It also manages functionality shared between xdg_surface based surface roles. See the documentation of xdg_surface for more details about what an xdg_surface is and how it is used. A client must respond to a ping event with a pong request or the client may be deemed unresponsive. See xdg_shell.ping. The ping event asks the client if it's still alive. Pass the serial specified in the event back to the compositor by sending a "pong" request back with the specified serial. See xdg_shell.ping. Compositors can use this to determine if the client is still alive. It's unspecified what will happen if the client doesn't respond to the ping request, or in what timeframe. Clients should try to respond in a reasonable amount of time. A compositor is free to ping in any way it wants, but a client must always respond to any xdg_shell object it created. An interface that may be implemented by a wl_surface, for implementations that provide a desktop-style user interface. It provides a base set of functionality required to construct user interface elements requiring management by the compositor, such as toplevel windows, menus, etc. The types of functionality are split into xdg_surface roles. Creating an xdg_surface does not set the role for a wl_surface. In order to map an xdg_surface, the client must create a role-specific object using, e.g., get_toplevel, get_popup. The wl_surface for any given xdg_surface can have at most one role, and may not be assigned any role not based on xdg_surface. A role must be assigned before any other requests are made to the xdg_surface object. The client must call wl_surface.commit on the corresponding wl_surface for the xdg_surface state to take effect. Creating an xdg_surface from a wl_surface which has a buffer attached or committed is a client error, and any attempts by a client to attach or manipulate a buffer prior to the first xdg_surface.configure call must also be treated as errors. For a surface to be mapped by the compositor, the following conditions must be met: (1) the client has assigned a xdg_surface based role to the surface, (2) the client has set and committed the xdg_surface state and the role dependent state to the surface and (3) the client has committed a buffer to the surface. Destroy the xdg_surface object. An xdg_surface must only be destroyed after its role object has been destroyed. This creates an xdg_toplevel object for the given xdg_surface and gives the associated wl_surface the xdg_toplevel role. See the documentation of xdg_toplevel for more details about what an xdg_toplevel is and how it is used. This creates an xdg_popup object for the given xdg_surface and gives the associated wl_surface the xdg_popup role. This request must be used in response to some sort of user action like a button press, key press, or touch down event. See the documentation of xdg_popup for more details about what an xdg_popup is and how it is used. The window geometry of a surface is its "visible bounds" from the user's perspective. Client-side decorations often have invisible portions like drop-shadows which should be ignored for the purposes of aligning, placing and constraining windows. The window geometry is double buffered, and will be applied at the time wl_surface.commit of the corresponding wl_surface is called. Once the window geometry of the surface is set, it is not possible to unset it, and it will remain the same until set_window_geometry is called again, even if a new subsurface or buffer is attached. If never set, the value is the full bounds of the surface, including any subsurfaces. This updates dynamically on every commit. This unset is meant for extremely simple clients. The arguments are given in the surface-local coordinate space of the wl_surface associated with this xdg_surface. The width and height must be greater than zero. Setting an invalid size will raise an error. When applied, the effective window geometry will be the set window geometry clamped to the bounding rectangle of the combined geometry of the surface of the xdg_surface and the associated subsurfaces. When a configure event is received, if a client commits the surface in response to the configure event, then the client must make an ack_configure request sometime before the commit request, passing along the serial of the configure event. For instance, for toplevel surfaces the compositor might use this information to move a surface to the top left only when the client has drawn itself for the maximized or fullscreen state. If the client receives multiple configure events before it can respond to one, it only has to ack the last configure event. A client is not required to commit immediately after sending an ack_configure request - it may even ack_configure several times before its next surface commit. A client may send multiple ack_configure requests before committing, but only the last request sent before a commit indicates which configure event the client really is responding to. The configure event marks the end of a configure sequence. A configure sequence is a set of one or more events configuring the state of the xdg_surface, including the final xdg_surface.configure event. Where applicable, xdg_surface surface roles will during a configure sequence extend this event as a latched state sent as events before the xdg_surface.configure event. Such events should be considered to make up a set of atomically applied configuration states, where the xdg_surface.configure commits the accumulated state. Clients should arrange their surface for the new states, and then send an ack_configure request with the serial sent in this configure event at some point before committing the new surface. If the client receives multiple configure events before it can respond to one, it is free to discard all but the last event it received. This interface defines an xdg_surface role which allows a surface to, among other things, set window-like properties such as maximize, fullscreen, and minimize, set application-specific metadata like title and id, and well as trigger user interactive operations such as interactive resize and move. Unmap and destroy the window. The window will be effectively hidden from the user's point of view, and all state like maximization, fullscreen, and so on, will be lost. Set the "parent" of this surface. This window should be stacked above a parent. The parent surface must be mapped as long as this surface is mapped. Parent windows should be set on dialogs, toolboxes, or other "auxiliary" surfaces, so that the parent is raised when the dialog is raised. Set a short title for the surface. This string may be used to identify the surface in a task bar, window list, or other user interface elements provided by the compositor. The string must be encoded in UTF-8. Set an application identifier for the surface. The app ID identifies the general class of applications to which the surface belongs. The compositor can use this to group multiple surfaces together, or to determine how to launch a new application. For D-Bus activatable applications, the app ID is used as the D-Bus service name. The compositor shell will try to group application surfaces together by their app ID. As a best practice, it is suggested to select app ID's that match the basename of the application's .desktop file. For example, "org.freedesktop.FooViewer" where the .desktop file is "org.freedesktop.FooViewer.desktop". See the desktop-entry specification [0] for more details on application identifiers and how they relate to well-known D-Bus names and .desktop files. [0] http://standards.freedesktop.org/desktop-entry-spec/ Clients implementing client-side decorations might want to show a context menu when right-clicking on the decorations, giving the user a menu that they can use to maximize or minimize the window. This request asks the compositor to pop up such a window menu at the given position, relative to the local surface coordinates of the parent surface. There are no guarantees as to what menu items the window menu contains. This request must be used in response to some sort of user action like a button press, key press, or touch down event. Start an interactive, user-driven move of the surface. This request must be used in response to some sort of user action like a button press, key press, or touch down event. The passed serial is used to determine the type of interactive move (touch, pointer, etc). The server may ignore move requests depending on the state of the surface (e.g. fullscreen or maximized), or if the passed serial is no longer valid. If triggered, the surface will lose the focus of the device (wl_pointer, wl_touch, etc) used for the move. It is up to the compositor to visually indicate that the move is taking place, such as updating a pointer cursor, during the move. There is no guarantee that the device focus will return when the move is completed. These values are used to indicate which edge of a surface is being dragged in a resize operation. Start a user-driven, interactive resize of the surface. This request must be used in response to some sort of user action like a button press, key press, or touch down event. The passed serial is used to determine the type of interactive resize (touch, pointer, etc). The server may ignore resize requests depending on the state of the surface (e.g. fullscreen or maximized). If triggered, the client will receive configure events with the "resize" state enum value and the expected sizes. See the "resize" enum value for more details about what is required. The client must also acknowledge configure events using "ack_configure". After the resize is completed, the client will receive another "configure" event without the resize state. If triggered, the surface also will lose the focus of the device (wl_pointer, wl_touch, etc) used for the resize. It is up to the compositor to visually indicate that the resize is taking place, such as updating a pointer cursor, during the resize. There is no guarantee that the device focus will return when the resize is completed. The edges parameter specifies how the surface should be resized, and is one of the values of the resize_edge enum. The compositor may use this information to update the surface position for example when dragging the top left corner. The compositor may also use this information to adapt its behavior, e.g. choose an appropriate cursor image. The different state values used on the surface. This is designed for state values like maximized, fullscreen. It is paired with the configure event to ensure that both the client and the compositor setting the state can be synchronized. States set in this way are double-buffered. They will get applied on the next commit. Desktop environments may extend this enum by taking up a range of values and documenting the range they chose in this description. They are not required to document the values for the range that they chose. Ideally, any good extensions from a desktop environment should make its way into standardization into this enum. The current reserved ranges are: 0x0000 - 0x0FFF: xdg-shell core values, documented below. 0x1000 - 0x1FFF: GNOME 0x2000 - 0x2FFF: EFL The surface is maximized. The window geometry specified in the configure event must be obeyed by the client. The surface is fullscreen. The window geometry specified in the configure event must be obeyed by the client. The surface is being resized. The window geometry specified in the configure event is a maximum; the client cannot resize beyond it. Clients that have aspect ratio or cell sizing configuration can use a smaller size, however. Client window decorations should be painted as if the window is active. Do not assume this means that the window actually has keyboard or pointer focus. Set a maximum size for the window. The client can specify a maximum size so that the compositor does not try to configure the window beyond this size. The width and height arguments are in window geometry coordinates. See xdg_surface.set_window_geometry. Values set in this way are double-buffered. They will get applied on the next commit. The compositor can use this information to allow or disallow different states like maximize or fullscreen and draw accurate animations. Similarly, a tiling window manager may use this information to place and resize client windows in a more effective way. The client should not rely on the compositor to obey the maximum size. The compositor may decide to ignore the values set by the client and request a larger size. If never set, or a value of zero in the request, means that the client has no expected maximum size in the given dimension. As a result, a client wishing to reset the maximum size to an unspecified state can use zero for width and height in the request. Requesting a maximum size to be smaller than the minimum size of a surface is illegal and will result in a protocol error. The width and height must be greater than or equal to zero. Using strictly negative values for width and height will result in a protocol error. Set a minimum size for the window. The client can specify a minimum size so that the compositor does not try to configure the window below this size. The width and height arguments are in window geometry coordinates. See xdg_surface.set_window_geometry. Values set in this way are double-buffered. They will get applied on the next commit. The compositor can use this information to allow or disallow different states like maximize or fullscreen and draw accurate animations. Similarly, a tiling window manager may use this information to place and resize client windows in a more effective way. The client should not rely on the compositor to obey the minimum size. The compositor may decide to ignore the values set by the client and request a smaller size. If never set, or a value of zero in the request, means that the client has no expected minimum size in the given dimension. As a result, a client wishing to reset the minimum size to an unspecified state can use zero for width and height in the request. Requesting a minimum size to be larger than the maximum size of a surface is illegal and will result in a protocol error. The width and height must be greater than or equal to zero. Using strictly negative values for width and height will result in a protocol error. Maximize the surface. After requesting that the surface should be maximized, the compositor will respond by emitting a configure event with the "maximized" state and the required window geometry. The client should then update its content, drawing it in a maximized state, i.e. without shadow or other decoration outside of the window geometry. The client must also acknowledge the configure when committing the new content (see ack_configure). It is up to the compositor to decide how and where to maximize the surface, for example which output and what region of the screen should be used. If the surface was already maximized, the compositor will still emit a configure event with the "maximized" state. Unmaximize the surface. After requesting that the surface should be unmaximized, the compositor will respond by emitting a configure event without the "maximized" state. If available, the compositor will include the window geometry dimensions the window had prior to being maximized in the configure request. The client must then update its content, drawing it in a regular state, i.e. potentially with shadow, etc. The client must also acknowledge the configure when committing the new content (see ack_configure). It is up to the compositor to position the surface after it was unmaximized; usually the position the surface had before maximizing, if applicable. If the surface was already not maximized, the compositor will still emit a configure event without the "maximized" state. Make the surface fullscreen. You can specify an output that you would prefer to be fullscreen. If this value is NULL, it's up to the compositor to choose which display will be used to map this surface. If the surface doesn't cover the whole output, the compositor will position the surface in the center of the output and compensate with black borders filling the rest of the output. Request that the compositor minimize your surface. There is no way to know if the surface is currently minimized, nor is there any way to unset minimization on this surface. If you are looking to throttle redrawing when minimized, please instead use the wl_surface.frame event for this, as this will also work with live previews on windows in Alt-Tab, Expose or similar compositor features. This configure event asks the client to resize its toplevel surface or to change its state. The configured state should not be applied immediately. See xdg_surface.configure for details. The width and height arguments specify a hint to the window about how its surface should be resized in window geometry coordinates. See set_window_geometry. If the width or height arguments are zero, it means the client should decide its own window dimension. This may happen when the compositor need to configure the state of the surface but doesn't have any information about any previous or expected dimension. The states listed in the event specify how the width/height arguments should be interpreted, and possibly how it should be drawn. Clients must send an ack_configure in response to this event. See xdg_surface.configure and xdg_surface.ack_configure for details. The close event is sent by the compositor when the user wants the surface to be closed. This should be equivalent to the user clicking the close button in client-side decorations, if your application has any... This is only a request that the user intends to close your window. The client may choose to ignore this request, or show a dialog to ask the user to save their data... A popup surface is a short-lived, temporary surface that can be used to implement menus. It takes an explicit grab on the surface that will be dismissed when the user dismisses the popup. This can be done by the user clicking outside the surface, using the keyboard, or even locking the screen through closing the lid or a timeout. When the popup is dismissed, a popup_done event will be sent out, and at the same time the surface will be unmapped. The xdg_popup object is now inert and cannot be reactivated, so clients should destroy it. Explicitly destroying the xdg_popup object will also dismiss the popup and unmap the surface. Clients will receive events for all their surfaces during this grab (which is an "owner-events" grab in X11 parlance). This is done so that users can navigate through submenus and other "nested" popup windows without having to dismiss the topmost popup. Clients that want to dismiss the popup when another surface of their own is clicked should dismiss the popup using the destroy request. The parent surface must have either the xdg_toplevel or xdg_popup surface role. Specifying an xdg_popup for the parent means that the popups are nested, with this popup now being the topmost popup. Nested popups must be destroyed in the reverse order they were created in, e.g. the only popup you are allowed to destroy at all times is the topmost one. If there is an existing popup when creating a new popup, the parent must be the current topmost popup. A parent surface must be mapped before the new popup is mapped. When compositors choose to dismiss a popup, they will likely dismiss every nested popup as well. When a compositor dismisses popups, it will follow the same dismissing order as required from the client. The x and y arguments passed when creating the popup object specify where the top left of the popup should be placed, relative to the local surface coordinates of the parent surface. See xdg_surface.get_popup. The client must call wl_surface.commit on the corresponding wl_surface for the xdg_popup state to take effect. For a surface to be mapped by the compositor the client must have committed both the xdg_popup state and a buffer. This destroys the popup. Explicitly destroying the xdg_popup object will also dismiss the popup, and unmap the surface. If this xdg_popup is not the "topmost" popup, a protocol error will be sent. The popup_done event is sent out when a popup is dismissed by the compositor. The client should destroy the xdg_popup object at this point.