// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

module ui.mojom;

import "gpu/ipc/common/surface_handle.mojom";
import "services/ui/public/interfaces/cursor/cursor.mojom";
import "services/ui/public/interfaces/event_matcher.mojom";
import "services/ui/public/interfaces/window_manager_constants.mojom";
import "services/ui/public/interfaces/window_tree_constants.mojom";
import "services/viz/public/interfaces/compositing/frame_sink_id.mojom";
import "services/viz/public/interfaces/compositing/local_surface_id.mojom";
import "skia/public/interfaces/bitmap.mojom";
import "ui/base/mojo/ui_base_types.mojom";
import "ui/display/mojo/display.mojom";
import "ui/events/mojo/event.mojom";
import "ui/events/mojo/event_constants.mojom";
import "ui/gfx/geometry/mojo/geometry.mojom";
import "ui/display/mojo/display.mojom";

// WindowManager is used when a WindowTreeClient attempts to modify
// a property of the embed root. When this happens WindowTree calls the
// appropriate function on WindowManager. For example, if a
// WindowTreeClient calls SetWindowBounds() on its embed root, WindowTree
// calls WmSetBounds(). WindowManager can then decide if it wants to
// change the bounds or not.
//
// This interface is only used as an associated interface and is associated
// with WindowTreeClient, further WindowTree requests this interface from
// WindowTreeClient supplied at the time the WindowTreeHost is created.
interface WindowManager {
  // WindowManager defines two sets of distinct properties.
  // . Properties that are used at creation time only and not persisted.
  // . Long lived properties. These properties may be changed at any time and
  //   are mapped to aura::Window properties. aura::PropertyConverter defines
  //   the mapping between the property defined here and the corresonding
  //   aura property. For properties defined in PropertyConverter any change to
  //   to the aura property is mapped to the property defined here and sent to
  //   all clients that know about the window (which is generally just the owner
  //   and the window-manager).

  // Properties used only during creation time. --------------------------------

  // Whether the window should be initially focusable or not. Type: bool.
  const string kFocusable_InitProperty = "init:focusable";

  // Whether the window should be opaque.
  const string kTranslucent_InitProperty = "init:translucent";

  // Initial bounds to create the window at. If empty the WindowManager decides
  // the initial bounds. Type: gfx::Rect.
  const string kBounds_InitProperty = "init:bounds";

  // The window manager will place the window in this container when the window
  // is created. If not set a container is selected based on the window type.
  // Type: int32_t.
  const string kContainerId_InitProperty = "init:container_id";

  // Disables the window manager from handling immersive fullscreen for the
  // window. This is typically done if the client wants to handle immersive
  // themselves. Type: bool.
  const string kDisableImmersive_InitProperty = "init:disable_immersive";

  // The id of the display (display::Display::id()) to create the window on.
  // Type: int64.
  const string kDisplayId_InitProperty = "init:display_id";

  // Specifies that the system default caption and icon should not be rendered,
  // and the client area should be equivalent to the window area. Type: bool
  const string kRemoveStandardFrame_InitProperty = "init:remove-standard-frame";

  // A flag controlling the window's presence on the mash shelf. Type: bool
  const string kWindowIgnoredByShelf_InitProperty =
      "init:window-ignored-by-shelf";

  // The window type. This maps to aura::client::kWindowTypeKey as well as
  // Window::type(). This mapping is only done for top-level windows that are
  // created by the window manager at the request of a client.
  // Type: mojom::WindowType (int32_t).
  const string kWindowType_InitProperty = "init:window-type";

  // End properties used only during creation time. ----------------------------

  // Long lived properties. ----------------------------------------------------

  // All primitive properties are transported as
  // aura::PropertyConverter::PrimitiveType.

  // Whether the window is always on top. Maps to aura::client::kAlwaysOnTopKey.
  // Type: bool.
  const string kAlwaysOnTop_Property = "prop:always_on_top";

  // The application icon; typically larger for shelf icons, etc. Type: SkBitmap
  const string kAppIcon_Property = "prop:app-icon";

  // Whether the window is trying to draw attention to itself (e.g. pulsing its
  // shelf icon). Type: bool.
  const string kDrawAttention_Property = "prop:draw-attention";

  // Used to explicitly control whether a window appears in the most recently
  // used list of windows. Maps to aura::client::kExcludeFromMruKey. Type: bool.
  const string kExcludeFromMru_Property = "prop:exclude_from_mru";

  // If true, when a window is in in fullscreen mode, the user cannot reveal
  // the top portion of the window through a touch / mouse gesture.
  // Type: bool.
  const string kImmersiveFullscreen_Property = "prop:immersive-fullscreen";

  // The window's minimum size as defined by its content. Maps to
  // aura::client::kMinimumSize_Property. Type: gfx::Size.
  const string kMinimumSize_Property = "prop:minimum-size";

  // Internal window name. Useful for debugging. Maps to aura::client::kNameKey.
  // Type: mojom::String
  const string kName_Property = "prop:name";

  // If true (and the window is a panel), it's attached to its shelf item.
  const string kPanelAttached_Property = "prop:panel-attached";

  // The window's preferred size as defined by its content. Maps to
  // aura::client::kPreferredSize_Property. Type: gfx::Size.
  const string kPreferredSize_Property = "prop:preferred-size";

  // If true the window manager renders the title area (including frame
  // decorations) of the parent window in this window. This is only checked
  // at the time the window is added to its parent, which must be a top level
  // window (created by way of WindowTree::NewTopLevelWindow()). This is not
  // mapped by default, it's up to the window manager (such as ash) to decide
  // how to handle this. Type: bool.
  const string kRenderParentTitleArea_Property =
      "render-parent-non-client-area";

  // The window's resize behavior. Maps to aura::client::kResizeBehaviorKey.
  // Type: ResizeBehavior.
  const string kResizeBehavior_Property = "prop:resize-behavior";

  // Bounds the window is restored to. Maps to client::kRestoreBoundsKey.
  // Type: gfx::Rect.
  const string kRestoreBounds_Property = "prop:restore-bounds";

  // See ShadowElevation for details. Type: wm::ShadowElevation.
  const string kShadowElevation_Property = "prop:shadow-elevation";

  // The serialized shelf id. Maps to ash::kShelfIDKey. Type: mojom::String.
  const string kShelfID_Property = "prop:shelf-id";

  // The type of item to be shown on the shelf for this window. Type: int
  // A few ash::ShelfItemType values are supported; TYPE_UNKNOWN means no item.
  const string kShelfItemType_Property = "prop:shelf-item-type";

  // The window's show state. Maps to aura::client::kShowStateKey.
  // Type: ShowState.
  const string kShowState_Property = "prop:show-state";

  // The window icon; typically 16x16 for titlebars. Type: SkBitmap
  const string kWindowIcon_Property = "prop:window-icon";

  // The window's title. Maps to aura::client::kTitleKey. Type: mojom::String
  const string kWindowTitle_Property = "prop:window-title";

  // End long lived properties. ------------------------------------------------

  // Called immediately when the WindowManager is obtained.
  OnConnect();

  // Called to notify about the real AcceleratedWidget associated with a
  // display. This is called only when mus is not hosting viz, and requires the
  // window manager to instead host viz.
  WmOnAcceleratedWidgetForDisplay(int64 display_id,
                                  gpu.mojom.SurfaceHandle surface_handle);

  // Called when a new display is added. |root| gives the root window specific
  // to this WindowManager for |display|. |local_surface_id| identifies the ID
  // to use to submit CompositorFrames.
  WmNewDisplayAdded(display.mojom.Display display,
                    WindowData root,
                    bool parent_drawn,
                    viz.mojom.LocalSurfaceId? local_surface_id);

  // Called when a display is removed. The root of the specified display is
  // still valid. It is expected the client calls DeleteWindow() shortly after
  // this with the root.
  WmDisplayRemoved(int64 display_id);

  // Called when a display is modified. The root of the specified display will
  // be resized by the WindowServer after this.
  WmDisplayModified(display.mojom.Display display);

  // When the WindowManager completes a request it must call back to
  // WindowManagerClient::WmResponse().
  WmSetBounds(uint32 change_id, uint32 window_id, gfx.mojom.Rect bounds);
  WmSetProperty(uint32 change_id,
                uint32 window_id,
                string name,
                array<uint8>? value);

  WmSetModalType(uint32 window_id, ModalType type);
  WmSetCanFocus(uint32 window_id, bool can_focus);

  // Asks the WindowManager to create a new window.
  // |frame_sink_id| is the FrameSinkId for the new window. Window manager
  // tracks top level windows by client with |frame_sink_id|.client_id().
  WmCreateTopLevelWindow(uint32 change_id,
                         viz.mojom.FrameSinkId frame_sink_id,
                         map<string, array<uint8>> properties);

  // A WindowTreeClient is considered "janky" by Mus when it stops ACK'ing input
  // events within a reasonable timeframe. When a client enters or exits this
  // state, Mus will tell the window manager about it so that the window manager
  // can update the UI for the janky windows.
  WmClientJankinessChanged(uint16 client_id, bool janky);

  // Asks the WindowManager to create a drag representation window: a window
  // which contains a single image representation.
  //
  // TODO(erg): SkBitmap is the wrong data type for the drag image; we should
  // be passing ImageSkias once http://crbug.com/655874 is implemented.
  WmBuildDragImage(gfx.mojom.Point screen_location,
                   skia.mojom.Bitmap? drag_image,
                   gfx.mojom.Vector2d drag_image_offset,
                   PointerKind source);

  // Moves the drag representation image to |screen_location|. The window server
  // queues further drags locally until they receive the callback.
  WmMoveDragImage(gfx.mojom.Point screen_location) => ();

  // Called when the drag image is no longer needed.
  WmDestroyDragImage();

  // Asks the WindowManager to interactively move the window. This will return
  // whether this completed successfully or not through the client's
  // OnWmMoveLoopCompleted().
  WmPerformMoveLoop(uint32 change_id, uint32 window_id,
                    MoveLoopSource source,
                    gfx.mojom.Point cursor_location);

  // Asks the WindowManager to cancel any outstanding move loop on |change_id|.
  WmCancelMoveLoop(uint32 change_id);

  // Asks the WindowManager to change the activation from the current window
  // to the next. The window manager may completely ignore this message.
  WmDeactivateWindow(uint32 window_id);

  // Asks the WindowMangaer to stack |above_id| in front of |below_id|.
  WmStackAbove(uint32 change_id, uint32 above_id, uint32 below_id);

  // Asks the WindowManager to stack |window_id| as the first child of its
  // window manager owned parent.
  WmStackAtTop(uint32 change_id, uint32 window_id);

  // Asks the WindowManager to perform |action| on |window_id|.
  WmPerformWmAction(uint32 window_id, string action);

  // An accelerator registered via AddAccelerator() has been triggered. If
  // |ack_id| is non-zero the accelerator matches a PRE_TARGET and must be
  // acknowledged by WindowManagerClient::OnAcceleratorAck().
  OnAccelerator(uint32 ack_id, uint32 accelerator_id, ui.mojom.Event event);

  // Whenever the visibility of the mouse cursor changes due to touch on the
  // server, the window manager gets notified of the change.
  OnCursorTouchVisibleChanged(bool enabled);

  // Called when a pointer down event occurs on a window and the event is
  // blocked by a modal window.
  OnEventBlockedByModalWindow(uint32 window_id);
};

struct WmAccelerator {
  uint32 id;
  EventMatcher event_matcher;
};

// This interface is only used as an associated interface and is associated
// with WindowTree.
interface WindowManagerClient {
  // Enables (or disables) child windows of |window_id| to be activated.
  AddActivationParent(uint32 window_id);
  RemoveActivationParent(uint32 window_id);

  // Extends the hit area for children of |window_id| by the specified amount.
  // |mouse_insets| is used for mouse events, and |touch_insets| for touch
  // events. NOTE: the insets are expected to be negative (or zero). If one
  // of the sizes of an inset is a positive value the call is ignored.
  SetExtendedHitRegionForChildren(uint32 window_id,
                                  gfx.mojom.Insets mouse_insets,
                                  gfx.mojom.Insets touch_insets);

  // Add and remove accelerators. When accelerators are registered the
  // WindowManager receives the event via OnAccelerator() rather than the
  // target window. The id is defined by the client and can be used to more
  // easily identify the accelerator's action.
  // Accelerator ids 1 << 31 and above are reserved for internal use.

  // See WindowTree for details on event dispatch.
  // This ignores any accelerators already defined with the same id or matcher.
  // Returns true if all accelerators were added successfully.
  AddAccelerators(array<WmAccelerator> accelerators) => (bool success);
  RemoveAccelerator(uint32 id);

  // Some platforms want to hide the cursor when the user presses a key, but
  // only on certain keys. When |dont_hide_cursor_list| is non-empty, the window
  // server will attempt to match all keys being dispatched to windows to this
  // list. If there is no match, the window server will hide the cursor. (The
  // list of keys to *not* hide on is much shorter than the list of all keys.)
  // The cursor will automatically be unhidden on the next mouse event.
  SetKeyEventsThatDontHideCursor(array<EventMatcher> dont_hide_cursor_list);

  // Sets the root window for a new |display|. This is only applicable if the
  // WindowTree does not |automatically_create_display_roots| (see
  // WindowManagerWindowTreeFactory::CreateWindowTree() for details).
  // This may also be called to move an existing root window to a new display.
  // |mirrors| contains a list of physical displays presenting contents mirrored
  // from another physical display, or from part of a virtual unified display.
  SetDisplayRoot(display.mojom.Display display,
                 WmViewportMetrics viewport_metrics,
                 bool is_primary_display,
                 uint32 window_id,
                 array<display.mojom.Display> mirrors) => (bool success);

  // Configures metrics for the displays and notifies observers. This is only
  // applicable if the WindowTree does not |automatically_create_display_roots|.
  // This *must* be called after any display related changes to inform
  // observers, for example, after calling SetDisplayRoot() this must be called
  // to inform observers of the display changes.
  // |mirrors| contains a list of physical displays presenting contents mirrored
  // from another physical display, or from part of a virtual unified display.
  SetDisplayConfiguration(
      array<display.mojom.Display> displays,
      array<WmViewportMetrics> viewport_metrics,
      int64 primary_display_id,
      int64 internal_display_id,
      array<display.mojom.Display> mirrors) => (bool success);

  // Swaps the display roots of the two displays.
  SwapDisplayRoots(int64 display_id1, int64 display_id2) => (bool success);

  // Sets the BlockingContainers; one per display. This should be called any
  // time displays are added or removed. See description of BlockingContainers
  // for details on what this does.
  SetBlockingContainers(array<BlockingContainers> blocking_containers) =>
      (bool success);

  // The window manager has completed a request with the specific change id.
  WmResponse(uint32 change_id, bool response);

  // The window manager has completed a SetBounds request with the specified
  // change id
  WmSetBoundsResponse(uint32 change_id);

  // Calls WindowTreeClient::RequestClose() on the embedded app at the
  // specified window.
  WmRequestClose(uint32 window_id);

  // Sets the frame decoration constants of the display the window manager is
  // associated with.
  WmSetFrameDecorationValues(FrameDecorationValues values);

  // Sets the cursor that the non-client areas of the window should use.
  WmSetNonClientCursor(uint32 window_id, CursorData cursor);

  // Locks and unlocks the cursor globally. Used during window management tasks
  // where the cursor shouldn't change.
  WmLockCursor();
  WmUnlockCursor();

  // Shows and hides the cursor globally. Used during window management tasks.
  WmSetCursorVisible(bool visible);

  // Sets whether we're using normal or large cursors.
  WmSetCursorSize(CursorSize cursor_size);

  // Sets a global cursor which overrides per-window cursors. Pass null to
  // clear.
  WmSetGlobalOverrideCursor(CursorData? cursor);

  // Moves the cursor to the given location on the given display.
  WmMoveCursorToDisplayLocation(gfx.mojom.Point display_pixels,
                                int64 display_id);

  // Confines the cursor to a rectangle in pixels on |display_id|.
  WmConfineCursorToBounds(gfx.mojom.Rect bounds_in_pixels,
                          int64 display_id);

  // The cursor is hidden and shown by touch events naturally, but the
  // window manager also can manually show/hide it for features.
  WmSetCursorTouchVisible(bool enabled);

  // Response from WmCreateTopLevelWindow() informing the client of the id for
  // the new window.
  OnWmCreatedTopLevelWindow(uint32 change_id, uint32 window_id);

  // See description in WindowManager::OnAccelerator(). |ack_id| is the value
  // that was passed to OnAccelerator(). If the accelerator is a pre-target
  // handler and |event_result| is UNHANDLED, then |properties| is added to
  // the KeyEvent that is dispatched to the client with the focused window.
  OnAcceleratorAck(uint32 ack_id,
                   EventResult event_result,
                   map<string, array<uint8>> properties);
};