1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 import "mojo/public/interfaces/application/service_provider.mojom"
6 import "mojo/services/public/interfaces/geometry/geometry.mojom"
7 import "mojo/services/public/interfaces/input_events/input_events.mojom"
8 import "mojo/services/public/interfaces/view_manager/view_manager_constants.mojom"
16 // TODO(sky): add visible.
25 // ViewManagerInitService is used to grant an application a connection to the
26 // ViewManager by embedding it at an approriate View.
27 interface ViewManagerInitService {
28 // Embed the application @ |url| at an appropriate View.
29 // The first time this method is called in the lifetime of a View Manager
30 // application instance, the "appropriate View" is defined as being the
32 // Subsequent times, implementation of this method is delegated to the
33 // application embedded at the service root View. This application is
34 // typically referred to as the "window manager", and will have a specific
35 // definition of where within its View hierarchy to embed an unparented URL.
36 // See ViewManagerService below for more details about |service_provider|.
37 Embed(string url, ServiceProvider service_provider) => (bool success);
40 // Views are identified by a uint32. The upper 16 bits are the connection id,
41 // and the lower 16 the id assigned by the client.
43 // The root view is identified with a connection id of 0, and value of 1.
44 [Client=ViewManagerClient]
45 interface ViewManagerService {
46 // Creates a new view with the specified id. It is up to the client to ensure
47 // the id is unique to the connection (the id need not be globally unique).
48 // Additionally the connection id (embedded in |view_id|) must match that of
51 // ERROR_CODE_VALUE_IN_USE: a view already exists with the specified id.
52 // ERROR_CODE_ILLEGAL_ARGUMENT: The connection part of |view_id| does not
53 // match the connection id of the client.
54 CreateView(uint32 view_id) => (ErrorCode error_code);
56 // Deletes a view. This does not recurse. No hierarchy change notifications
57 // are sent as a result of this. Only the connection that created the view can
59 DeleteView(uint32 view_id) => (bool success);
61 // Sets the specified bounds of the specified view.
62 SetViewBounds(uint32 view_id, mojo.Rect bounds) => (bool success);
64 // Sets the visibility of the specified view to |visible|. Connections are
65 // allowed to change the visibility of any view they have created, as well as
66 // any of their roots.
67 SetViewVisibility(uint32 view_id, bool visible) => (bool success);
70 // This fails for any of the following reasons:
71 // . |parent| or |child| does not identify a valid view.
72 // . |child| is an ancestor of |parent|.
73 // . |child| is already a child of |parent|.
75 // This may result in a connection getting OnViewDeleted(). See
76 // RemoveViewFromParent for details.
77 AddView(uint32 parent, uint32 child) => (bool success);
79 // Removes a view from its current parent. This fails if the view is not
80 // valid or the view already has no parent.
82 // Removing a view from a parent may result in OnViewDeleted() being sent to
83 // other connections. For example, connection A has views 1 and 2, with 2 a
84 // child of 1. Connection B has a root 1. If 2 is removed from 1 then B gets
85 // OnViewDeleted(). This is done as view 2 is effectively no longer visible to
87 RemoveViewFromParent(uint32 view_id) => (bool success);
89 // Reorders a view in its parent, relative to |relative_view_id| according to
91 // Only the connection that created the view's parent can reorder its
93 ReorderView(uint32 view_id,
94 uint32 relative_view_id,
95 OrderDirection direction) => (bool success);
97 // Returns the views comprising the tree starting at |view_id|. |view_id| is
98 // the first result in the return value, unless |view_id| is invalid, in which
99 // case an empty vector is returned. The views are visited using a depth first
100 // search (pre-order).
101 GetViewTree(uint32 view_id) => (ViewData[] views);
103 // Shows the specified image (png encoded) in the specified view.
104 SetViewContents(uint32 view_id,
105 handle<shared_buffer> buffer,
106 uint32 buffer_size) => (bool success);
108 // Embeds the app for |url| in the specified view. More specifically this
109 // creates a new connection to the specified url, expecting to get a
110 // ViewManagerClient and configures it with the root view |view|. Fails
111 // if |view| was not created by this connection.
113 // If a particular client invokes Embed() multiple times with the same url,
114 // the connection is reused. When this happens the ViewManagerClient is
115 // notified of the additional roots by way of OnEmbed().
117 // A view may only be a root of one connection at a time. Subsequent calls to
118 // Embed() for the same view result in the view being removed from the
119 // current connection. The current connection is told this by way of
122 // When a connection embeds an app the connection no longer has priviledges
123 // to access or see any of the children of the view. If the view had existing
124 // children the children are removed. The one exception is the root
127 // If |view_id| is 0, the View Manager delegates determination of what view to
128 // embed |url| at to the app embedded at the service root view (i.e. the
131 // |service_provider| encapsulates services offered by the embedder to the
132 // embedded app alongside this Embed() call. It also provides a means for
133 // the embedder to connect to services symmetrically exposed by the embedded
134 // app. Note that if a different app is subsequently embedded at |view_id|
135 // the |service_provider|'s connection to its client in the embedded app and
136 // any services it provided are not broken and continue to be valid.
139 ServiceProvider service_provider) => (bool success);
141 // TODO(sky): move these to a separate interface when FIFO works.
143 // Sends OnViewInputEvent() to the owner of the specified view.
144 DispatchOnViewInputEvent(uint32 view_id, mojo.Event event);
147 // Changes to views are not sent to the connection that originated the
148 // change. For example, if connection 1 changes the bounds of a view by calling
149 // SetBounds(), connection 1 does not receive OnViewBoundsChanged().
150 [Client=ViewManagerService]
151 interface ViewManagerClient {
152 // Invoked when the client application has been embedded at |root|.
153 // See Embed() on ViewManagerService for more details.
154 OnEmbed(uint16 connection_id,
157 ServiceProvider& service_provider);
159 // Invoked when a view's bounds have changed.
160 OnViewBoundsChanged(uint32 view, mojo.Rect old_bounds, mojo.Rect new_bounds);
162 // Invoked when a change is done to the hierarchy. A value of 0 is used to
163 // identify a null view. For example, if the old_parent is NULL, 0 is
165 // |views| contains any views that are that the client has not been told
166 // about. This is not sent for hierarchy changes of views not known to this
167 // client or not attached to the tree.
168 OnViewHierarchyChanged(uint32 view,
173 // Invoked when the order of views within a parent changes.
174 OnViewReordered(uint32 view_id,
175 uint32 relative_view_id,
176 OrderDirection direction);
178 // Invoked when a view is deleted.
179 OnViewDeleted(uint32 view);
181 // Invoked when an event is targeted at the specified view.
182 OnViewInputEvent(uint32 view, mojo.Event event) => ();
184 // TODO(sky): The following methods represent an interface between the view
185 // manager and the application embedded at the service root view
186 // (i.e. the window manager). These methods are not called on
187 // any other clients. They should be moved to a separate interface
188 // once support for derived FIFOs is landed.
190 // Requests the window manager create a "top level" view embedding |url|.
191 Embed(string url, ServiceProvider& service_provider);
193 // Requests the view manager dispatch the event.
194 DispatchOnViewInputEvent(mojo.Event event);