android: Introduce a ui::PlatformWindow implementation for android.

components/view_manager/native_viewport/platform_viewport_win.cc

-// Copyright 2013 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.
-
-#include "components/view_manager/native_viewport/platform_viewport.h"
-
-#include "base/memory/scoped_ptr.h"
-#include "components/view_manager/native_viewport/platform_viewport_headless.h"
-#include "components/view_manager/public/interfaces/view_manager.mojom.h"
-#include "mojo/converters/geometry/geometry_type_converters.h"
-#include "mojo/converters/input_events/input_events_type_converters.h"
-#include "ui/events/event.h"
-#include "ui/gfx/geometry/rect.h"
-#include "ui/platform_window/platform_window_delegate.h"
-#include "ui/platform_window/win/win_window.h"
-
-namespace native_viewport {
-namespace {
-float ConvertUIWheelValueToMojoValue(int offset) {
-  // Mojo's event type takes a value between -1 and 1. Normalize by allowing
-  // up to 20 of ui's offset. This is a bit arbitrary.
-  return std::max(
-      -1.0f, std::min(1.0f, static_cast<float>(offset) /
-                                (20 * static_cast<float>(
-                                          ui::MouseWheelEvent::kWheelDelta))));
-}
-}  // namespace
-
-class PlatformViewportWin : public PlatformViewport,
-                            public ui::PlatformWindowDelegate {
- public:
-  explicit PlatformViewportWin(Delegate* delegate)
-      : delegate_(delegate) {
-  }
-
-  ~PlatformViewportWin() override {
-    // Destroy the platform-window while |this| is still alive.
-    platform_window_.reset();
-  }
-
- private:
-  // Overridden from PlatformViewport:
-  void Init(const gfx::Rect& bounds) override {
-    metrics_ = mojo::ViewportMetrics::New();
-    // TODO(sky): make density real.
-    metrics_->device_pixel_ratio = 1.f;
-    metrics_->size_in_pixels = mojo::Size::From(bounds.size());
-    platform_window_.reset(new ui::WinWindow(this, bounds));
-  }
-
-  void Show() override {
-    platform_window_->Show();
-  }
-
-  void Hide() override {
-    platform_window_->Hide();
-  }
-
-  void Close() override {
-    platform_window_->Close();
-  }
-
-  gfx::Size GetSize() override {
-    return metrics_->size_in_pixels.To<gfx::Size>();
-  }
-
-  void SetBounds(const gfx::Rect& bounds) override {
-    platform_window_->SetBounds(bounds);
-  }
-
-  // ui::PlatformWindowDelegate:
-  void OnBoundsChanged(const gfx::Rect& new_bounds) override {
-    // TODO(fsamuel): Use the real device_scale_factor.
-    delegate_->OnMetricsChanged(new_bounds.size(),
-                                1.f /* device_scale_factor */);
-  }
-
-  void OnDamageRect(const gfx::Rect& damaged_region) override {
-  }
-
-  void DispatchEvent(ui::Event* event) override {
-    // TODO(jam): this code is copied from the X11 version.
-    mojo::EventPtr mojo_event(mojo::Event::From(*event));
-    if (event->IsMouseWheelEvent()) {
-      // Mojo's event type has a different meaning for wheel events. Convert
-      // between the two.
-      ui::MouseWheelEvent* wheel_event =
-          static_cast<ui::MouseWheelEvent*>(event);
-      DCHECK(mojo_event->pointer_data);
-      mojo_event->pointer_data->horizontal_wheel =
-          ConvertUIWheelValueToMojoValue(wheel_event->x_offset());
-      mojo_event->pointer_data->horizontal_wheel =
-          ConvertUIWheelValueToMojoValue(wheel_event->y_offset());
-    }
-    delegate_->OnEvent(mojo_event.Pass());
-
-    switch (event->type()) {
-      case ui::ET_MOUSE_PRESSED:
-      case ui::ET_TOUCH_PRESSED:
-        platform_window_->SetCapture();
-        break;
-      case ui::ET_MOUSE_RELEASED:
-      case ui::ET_TOUCH_RELEASED:
-        platform_window_->ReleaseCapture();
-        break;
-      default:
-        break;
-    }
-  }
-
-  void OnCloseRequest() override {
-    platform_window_->Close();
-  }
-
-  void OnClosed() override {
-    delegate_->OnDestroyed();
-  }
-
-  void OnWindowStateChanged(ui::PlatformWindowState state) override {
-  }
-
-  void OnLostCapture() override {
-  }
-
-  void OnAcceleratedWidgetAvailable(
-      gfx::AcceleratedWidget widget) override {
-    delegate_->OnAcceleratedWidgetAvailable(widget,
-                                            metrics_->device_pixel_ratio);
-  }
-
-  void OnActivationChanged(bool active) override {}
-
-  scoped_ptr<ui::PlatformWindow> platform_window_;
-  Delegate* delegate_;
-  mojo::ViewportMetricsPtr metrics_;
-
-  DISALLOW_COPY_AND_ASSIGN(PlatformViewportWin);
-};
-
-// static
-scoped_ptr<PlatformViewport> PlatformViewport::Create(Delegate* delegate,
-                                                      bool headless) {
-  if (headless)
-    return PlatformViewportHeadless::Create(delegate);
-  return make_scoped_ptr(new PlatformViewportWin(delegate));
-}
-
-}  // namespace native_viewport