[CRD iOS] Trackpad Input Mode

remoting/client/ui/desktop_viewport.h

 // Copyright 2017 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.
 
 #ifndef REMOTING_CLIENT_UI_DESKTOP_VIEWPORT_H_
 #define REMOTING_CLIENT_UI_DESKTOP_VIEWPORT_H_
 
 #include "base/callback.h"
 #include "remoting/client/ui/view_matrix.h"
 
@@ skipping 36 matching lines @@
   // Scales the desktop on the surface's reference frame at pivot point (px, py)
   // by |scale|.
   void ScaleDesktop(float px, float py, float scale);
 
   // Moves the viewport center by <x, y> on the desktop's coordinate.
   void MoveViewport(float dx, float dy);
 
   // Sets the viewport center to (x, y) on the desktop's coordinate.
   void SetViewportCenter(float x, float y);
 
+  // Returns the current center of the viewport on the desktop's coordinate.
+  ViewMatrix::Point GetViewportCenter() const;
+
+  // Constrains |point| within the bounds of the desktop. Do nothing if the
+  // desktop size is not set.
+  ViewMatrix::Point ConstrainPointToDesktop(
+      const ViewMatrix::Point& point) const;
+
   // Registers the callback to be called once the transformation has changed.
   // run_immediately: If true and the viewport is ready to be used, the callback
   //     will be called immedately with the transformation matrix.
   void RegisterOnTransformationChangedCallback(
       const TransformationCallback& callback,
       bool run_immediately);
 
   // Returns the reference to the desktop-to-surface transformation.
   const ViewMatrix& GetTransformation() const;
 
@@ skipping 14 matching lines @@
   bool IsViewportReady() const;
 
   // Adjusts the size and position of the viewport so that the constrains always
   // hold, then feed the matrix to |on_transformation_changed_|.
   void UpdateViewport();
 
   // Gets a rectangle of all possible positions where the viewport's center can
   // locate.
   Bounds GetViewportCenterBounds() const;
 
-  // Returns the current center of the viewport on the desktop's coordinate.
-  ViewMatrix::Point GetViewportCenter() const;
-
   // Translates the viewport on the desktop's reference frame by <dx, dy>,
   // without calling UpdateViewport().
   void MoveViewportWithoutUpdate(float dx, float dy);
 
   // Moves the point inside the bounds with minimum displacement if it is out of
   // the bounds.
   static ViewMatrix::Point ConstrainPointToBounds(
       const Bounds& bounds,
       const ViewMatrix::Point& point);
 
   ViewMatrix::Vector2D desktop_size_{0.f, 0.f};
   ViewMatrix::Vector2D surface_size_{0.f, 0.f};
 
   ViewMatrix desktop_to_surface_transform_;
 
   TransformationCallback on_transformation_changed_;
 
   // DesktopViewport is neither copyable nor movable.
   DesktopViewport(const DesktopViewport&) = delete;
   DesktopViewport& operator=(const DesktopViewport&) = delete;
 };
 
 }  // namespace remoting
 #endif  // REMOTING_CLIENT_UI_DESKTOP_VIEWPORT_H_