// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

module remote_cocoa.mojom;

import "mojo/public/mojom/base/process_id.mojom";
import "mojo/public/mojom/base/string16.mojom";
import "ui/base/accelerators/mojom/accelerator.mojom";
import "ui/base/mojom/dialog_button.mojom";
import "ui/base/mojom/window_open_disposition.mojom";
import "ui/display/mojom/display.mojom";
import "ui/events/mojom/event.mojom";
import "ui/gfx/geometry/mojom/geometry.mojom";
import "ui/gfx/mojom/ca_layer_params.mojom";

struct ValidateUserInterfaceItemResult {
  // Whether or not the specified sender should be enabled.
  bool enable;

  // If true, then the item should be disabled if there exists no key equivalent
  // for the item.
  bool disable_if_has_no_key_equivalent;

  // The new title to set for the item (unset if the title is not to be
  // changed).
  mojo_base.mojom.String16? new_title;

  // Whether or not to change the hidden state for the item, and the new hidden
  // state to set.
  bool set_hidden_state;
  bool new_hidden_state;

  // Whether or not to change the toggled state for the item, and the new toggle
  // state to set.
  bool set_toggle_state;
  bool new_toggle_state;
};

// The resulf of hit testing. Used for routing mouse event to the appropriate
// target.
enum HitTestResult {
  // Hits the draggable background area. The NSWindow handles the dragging.
  kDraggableBackground,
  // Hits the NSView that hosts views::RootView. The event is sent to this root
  // NSView, then the toolkit-views handles the event.
  kRootView,
  // Hits a subview of the root NSView. The event is sent to the subview.
  // Usually, this is a RenderWidgetHostViewCocoa which presents a content
  // area.
  kSubView,
  // Hits other area. This includes resize handles, traffic lights, etc. The
  // NSWindow handles the event.
  kOther,
};

// The interface through which an NSWindow (possibly in a process separate from
// the browser process) may interact with a NativeWidgetMac.
interface NativeWidgetNSWindowHost {
  // Update the views::Widget, ui::Compositor and ui::Layer's visibility.
  OnVisibilityChanged(bool visible);

  // Called when -[NSWindow isOnActiveSpace] changes.
  OnSpaceActivationChanged(bool is_space_active);

  // Called when the window's native theme changes.
  OnWindowNativeThemeChanged();

  // Resize the underlying views::View to |new_size| in response to the
  // NSView's frame changing size. Note that this will not necessarily match
  // the content bounds from OnWindowGeometryChanged.
  OnViewSizeChanged(gfx.mojom.Size new_size);

  // The vertical position from which sheets should be anchored, from the top
  // of the content view.
  [Sync]
  GetSheetOffsetY() => (int32 offset_y);

  // Indicate if full keyboard accessibility is needed and update focus if
  // needed.
  SetKeyboardAccessible(bool enabled);

  // Indicate if the NSView for this widget is the first responder for the
  // NSWindow for this widget.
  OnIsFirstResponderChanged(bool is_first_responder);

  // Indicate if mouse capture is active.
  OnMouseCaptureActiveChanged(bool capture_is_active);

  // Handle events. Note that whether or not the event is actually handled is
  // not returned.
  OnScrollEvent(ui.mojom.Event event);
  OnMouseEvent(ui.mojom.Event event);
  OnGestureEvent(ui.mojom.Event event);

  // Synchronously dispatch a key event and return in |event_handled| whether
  // or not the event was handled. This method is to be used only via the
  // NativeWidgetNSWindowHostHelper interface.
  [Sync]
  DispatchKeyEventRemote(ui.mojom.Event event) => (bool event_handled);

  // Synchronously dispatch a key event to the current menu controller (if one
  // exists and is owned by the widget for this). Return in |event_swallowed|
  // whether or not the event was swallowed (that is, if the menu's dispatch
  // returned POST_DISPATCH_NONE). Return in |event_handled| whether or not the
  // event was handled (that is, if the event in the caller's scope should be
  // marked as handled). This method is to be used only via the
  // NativeWidgetNSWindowHostHelper interface.
  [Sync]
  DispatchKeyEventToMenuControllerRemote(ui.mojom.Event event) =>
      (bool event_swallowed, bool event_handled);

  // Called when the NSEvent monitor observes an event. If `event_handled` is
  // true, then do not continue dispatching the event.
  [Sync]
  DispatchMonitorEvent(ui.mojom.Event event) => (bool event_handled);

  // Synchronously return in  |has_menu_controller| whether or not a menu
  // controller exists for this widget.
  [Sync]
  GetHasMenuController() => (bool has_menu_controller);

  // Synchronously hit tests point `location_in_content` in the toolkit-views
  // tree.
  [Sync]
  GetHitTestResult(gfx.mojom.Point location_in_content) =>
      (HitTestResult hit_test_result);

  // Asynchronously query the tooltip text for |location_in_content|.
  GetTooltipTextAt(gfx.mojom.Point location_in_content) =>
      (mojo_base.mojom.String16 new_tooltip_text);

  // Synchronously query the value of IsModal for this widget and store it in
  // |widget_is_modal|.
  [Sync]
  GetWidgetIsModal() => (bool widget_is_modal);

  // Synchronously return in |is_textual| whether or not the focused view
  // contains text that can be selected and copied.
  [Sync]
  GetIsFocusedViewTextual() => (bool is_textual);

  // Called whenever the NSWindow's size or position changes.
  OnWindowGeometryChanged(
      gfx.mojom.Rect window_bounds_in_screen_dips,
      gfx.mojom.Rect content_bounds_in_screen_dips);

  // Called when the window is about to be live resized.
  OnWindowWillStartLiveResize();

  // Called when a live resize operation on the window has ended.
  OnWindowDidEndLiveResize();

  // Called when the window begins transitioning to or from being fullscreen.
  OnWindowFullscreenTransitionStart(
      bool target_fullscreen_state);

  // Called when the window has completed its transition to or from being
  // fullscreen. Note that if there are multiple consecutive transitions
  // (because a new transition was initiated before the previous one completed)
  // then this will only be called when all transitions have competed.
  OnWindowFullscreenTransitionComplete(bool is_fullscreen);

  // Called when the window is miniaturized or deminiaturized.
  OnWindowMiniaturizedChanged(bool miniaturized);

  // Called when the window's zoomed state changes.
  OnWindowZoomedChanged(bool zoomed);

  // Called when the current display or the properties of the current display
  // change.
  OnWindowDisplayChanged(display.mojom.Display display);

  // Called before the NSWindow is closed and destroyed.
  OnWindowWillClose();

  // Called after the NSWindow has been closed and destroyed.
  OnWindowHasClosed();

  // Called when the NSWindow becomes key or resigns from being key. Additional
  // state required for the transition include whether or not the content NSView
  // is the first responder for the NSWindow in |is_content_first_responder| and
  // whether or not the NSApp's full keyboard access is enabled in
  // |full_keyboard_access_enabled|.
  OnWindowKeyStatusChanged(bool is_key,
                           bool is_content_first_responder,
                           bool full_keyboard_access_enabled);

  // Called when the blob of data that represents the NSWindow's restorable
  // state has changed.
  OnWindowStateRestorationDataChanged(array<uint8> data);

  // Called when the toolbar reveal status changes. The toolbar is visible
  // either because there are outstanding reveal locks or the mouse is
  // hovering over the upper border of the screen.
  OnImmersiveFullscreenToolbarRevealChanged(bool is_revealed);

  // Called when the menubar reveal status changes.
  // `reveal_amount` ranges in [0, 1]. This is the opacity of the menubar
  // and the browser window traffic lights.
  OnImmersiveFullscreenMenuBarRevealChanged(double reveal_amount);

  // Returns height of the menubar if the menubar autohides, otherwise 0.
  OnAutohidingMenuBarHeightChanged(int32 menu_bar_height);

  // Accept or cancel the current dialog window (depending on the value of
  // |button|), if a current dialog exists.
  DoDialogButtonAction(ui.mojom.DialogButton button);

  // Synchronously determine if the specified button exists in the current
  // dialog (if any), along with its label, whether or not it is enabled, and
  // whether or not it is the default button..
  [Sync]
  GetDialogButtonInfo(ui.mojom.DialogButton button) => (bool button_exists,
                      mojo_base.mojom.String16 title,
                      bool is_button_enabled,
                      bool is_button_default);

  // Synchronously return in |buttons_exist| whether or not any buttons exist
  // for the current dialog.
  [Sync]
  GetDoDialogButtonsExist() => (bool buttons_exist);

  // Synchronously query if the NSWindow should display its title.
  [Sync]
  GetShouldShowWindowTitle() => (bool should_show_window_title);

  // Synchronously query if the NSWindow can become key (activate, in views
  // terminology).
  [Sync]
  GetCanWindowBecomeKey() => (bool can_window_become_key);

  // Synchronously query if the NSWindow should always render as if it is
  // the key window (is active, in views terminology).
  [Sync]
  GetAlwaysRenderWindowAsKey() => (bool always_render_as_key);

  // Synchronously query if the NSWindow should always render as if it is
  // the key window (is active, in views terminology).
  [Sync]
  OnWindowCloseRequested() => (bool can_window_close);

  // Synchronously query if the NSWindow's theme frame overrides the titlebar
  // height, and, if so, what the overridden height is.
  [Sync]
  GetWindowFrameTitlebarHeight() => (bool override_titlebar_height,
                                     float titlebar_height);

  // Handle "Move focus to the window toolbar" shortcut.
  OnFocusWindowToolbar();

  // Send the token for the NSWindow and NSView for this widget.
  SetRemoteAccessibilityTokens(
      array<uint8> window_token, array<uint8> view_token);

  // Return in |element_token| the token for the root views AX node for this
  // view and in |host_pid| the pid for the host process.
  [Sync]
  GetRootViewAccessibilityToken() =>
      (mojo_base.mojom.ProcessId host_pid, array<uint8> element_token);

  // Return the result for -[NSUserInterfaceValidations
  // validateUserInterfaceItem] for a given command, along with any state for
  // that item that should be updated.
  [Sync]
  ValidateUserInterfaceItem(int32 command) =>
      (ValidateUserInterfaceItemResult result);

  // Returns in |will_execute| whether or not ExecuteCommand() will execute
  // the chrome command |command| with |window_open_disposition| and
  // |is_before_first_responder|.
  [Sync]
  WillExecuteCommand(int32 command,
                     ui.mojom.WindowOpenDisposition window_open_disposition,
                     bool is_before_first_responder) => (bool will_execute);

  // Execute the chrome command |command| with |window_open_disposition|. If
  // |is_before_first_responder| then only call ExecuteCommand if the command
  // is reserved and extension shortcut handling is not suspended. Returns in
  // |was_executed| whether or not ExecuteCommand was called (regardless of what
  // the return value for ExecuteCommand was).
  [Sync]
  ExecuteCommand(int32 command,
                 ui.mojom.WindowOpenDisposition window_open_disposition,
                 bool is_before_first_responder) => (bool was_executed);

  // Give the widget's FocusManager a chance to to handle the specified
  // accelerator. If |require_priority_handler| is true, the only send the
  // accelerator to the FocusManager if the FocusManager has a priority handler
  // for the specified accelerator.
  [Sync]
  HandleAccelerator(ui.mojom.Accelerator accelerator,
                    bool require_priority_handler) =>
      (bool was_handled);
};