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

ui/platform_window/android/platform_window_android.cc

+// 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.
+
+#include "ui/platform_window/android/platform_window_android.h"
+
+#include <android/input.h>
+#include <android/native_window_jni.h>
+
+#include "base/android/jni_android.h"
+#include "jni/PlatformWindowAndroid_jni.h"
+#include "ui/events/event.h"
+#include "ui/events/keycodes/keyboard_code_conversion_android.h"
+#include "ui/gfx/geometry/point.h"
+#include "ui/platform_window/platform_window_delegate.h"
+
+namespace ui {
+
+namespace {
+
+ui::EventType MotionEventActionToEventType(jint action) {
+  switch (action) {
+    case AMOTION_EVENT_ACTION_DOWN:
+    case AMOTION_EVENT_ACTION_POINTER_DOWN:
+      return ui::ET_TOUCH_PRESSED;
+    case AMOTION_EVENT_ACTION_UP:
+    case AMOTION_EVENT_ACTION_POINTER_UP:
+      return ui::ET_TOUCH_RELEASED;
+    case AMOTION_EVENT_ACTION_MOVE:
+      return ui::ET_TOUCH_MOVED;
+    case AMOTION_EVENT_ACTION_CANCEL:
+      return ui::ET_TOUCH_CANCELLED;
+    case AMOTION_EVENT_ACTION_OUTSIDE:
+    case AMOTION_EVENT_ACTION_HOVER_MOVE:
+    case AMOTION_EVENT_ACTION_SCROLL:
+    case AMOTION_EVENT_ACTION_HOVER_ENTER:
+    case AMOTION_EVENT_ACTION_HOVER_EXIT:
+    default:
+      NOTIMPLEMENTED() << "Unimplemented motion action: " << action;
+  }
+  return ui::ET_UNKNOWN;
+}
+
+}  // namespace
+
+////////////////////////////////////////////////////////////////////////////////
+// PlatformWindowAndroid, public:
+
+// static
+bool PlatformWindowAndroid::Register(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+PlatformWindowAndroid::PlatformWindowAndroid(PlatformWindowDelegate* delegate)
+    : delegate_(delegate),
+      window_(NULL),
+      id_generator_(0),
+      weak_factory_(this) {
+}
+
+PlatformWindowAndroid::~PlatformWindowAndroid() {
+  if (window_)
+    ReleaseWindow();
+  if (!java_platform_window_android_.is_empty()) {
+    JNIEnv* env = base::android::AttachCurrentThread();
+    Java_PlatformWindowAndroid_detach(
+        env, java_platform_window_android_.get(env).obj());
+  }
+}
+
+void PlatformWindowAndroid::Destroy(JNIEnv* env, jobject obj) {
+  delegate_->OnClosed();
+}
+
+void PlatformWindowAndroid::SurfaceCreated(JNIEnv* env,
+                                           jobject obj,
+                                           jobject jsurface,
+                                           float device_pixel_ratio) {
+  base::android::ScopedJavaLocalRef<jobject> protector(env, jsurface);
+  // Note: This ensures that any local references used by
+  // ANativeWindow_fromSurface are released immediately. This is needed as a
+  // workaround for https://code.google.com/p/android/issues/detail?id=68174
+  {
+    base::android::ScopedJavaLocalFrame scoped_local_reference_frame(env);
+    window_ = ANativeWindow_fromSurface(env, jsurface);
+  }
+  delegate_->OnAcceleratedWidgetAvailable(window_);
+}
+
+void PlatformWindowAndroid::SurfaceDestroyed(JNIEnv* env, jobject obj) {
+  DCHECK(window_);
+  ReleaseWindow();
+  // TODO(sad): Call OnClosed() here?
+}
+
+void PlatformWindowAndroid::SurfaceSetSize(JNIEnv* env,
+                                           jobject obj,
+                                           jint width,
+                                           jint height,
+                                           jfloat density) {
+  size_ = gfx::Size(static_cast<int>(width), static_cast<int>(height));
+  delegate_->OnBoundsChanged(gfx::Rect(size_));
+}
+
+bool PlatformWindowAndroid::TouchEvent(JNIEnv* env,
+                                       jobject obj,
+                                       jlong time_ms,
+                                       jint masked_action,
+                                       jint pointer_id,
+                                       jfloat x,
+                                       jfloat y,
+                                       jfloat pressure,
+                                       jfloat touch_major,
+                                       jfloat touch_minor,
+                                       jfloat orientation,
+                                       jfloat h_wheel,
+                                       jfloat v_wheel) {
+  ui::EventType event_type = MotionEventActionToEventType(masked_action);
+  if (event_type == ui::ET_UNKNOWN)
+    return false;
+  ui::TouchEvent touch(event_type, gfx::PointF(x, y), ui::EF_NONE, pointer_id,
+      base::TimeDelta::FromMilliseconds(time_ms),
+      touch_major, touch_minor, orientation, pressure);
+  delegate_->DispatchEvent(&touch);
+  return true;
+}
+
+bool PlatformWindowAndroid::KeyEvent(JNIEnv* env,
+                                     jobject obj,
+                                     bool pressed,
+                                     jint key_code,
+                                     jint unicode_character) {
+  ui::KeyEvent key_event(pressed ? ui::ET_KEY_PRESSED : ui::ET_KEY_RELEASED,
+                         ui::KeyboardCodeFromAndroidKeyCode(key_code), 0);
+  key_event.set_platform_keycode(key_code);
+  delegate_->DispatchEvent(&key_event);
+  if (pressed && unicode_character) {
+    ui::KeyEvent char_event(unicode_character,
+                            ui::KeyboardCodeFromAndroidKeyCode(key_code), 0);
+    char_event.set_platform_keycode(key_code);
+    delegate_->DispatchEvent(&char_event);
+  }
+  return true;
+}
+
+void PlatformWindowAndroid::ReleaseWindow() {
+  ANativeWindow_release(window_);
+  window_ = NULL;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// PlatformWindowAndroid, PlatformWindow implementation:
+
+void PlatformWindowAndroid::Show() {
+  if (!java_platform_window_android_.is_empty())
+    return;
+  JNIEnv* env = base::android::AttachCurrentThread();
+  java_platform_window_android_ = JavaObjectWeakGlobalRef(
+      env, Java_PlatformWindowAndroid_createForActivity(
+               env, base::android::GetApplicationContext(),
+               reinterpret_cast<jlong>(this)).obj());
+}
+
+void PlatformWindowAndroid::Hide() {
+  // Nothing to do. View is always visible.
+}
+
+void PlatformWindowAndroid::Close() {
+  delegate_->OnCloseRequest();
+}
+
+void PlatformWindowAndroid::SetBounds(const gfx::Rect& bounds) {
+  NOTIMPLEMENTED();
+}
+
+gfx::Rect PlatformWindowAndroid::GetBounds() {
+  return gfx::Rect(size_);
+}
+
+void PlatformWindowAndroid::SetCapture() {
+  NOTIMPLEMENTED();
+}
+
+void PlatformWindowAndroid::ReleaseCapture() {
+  NOTIMPLEMENTED();
+}
+
+void PlatformWindowAndroid::ToggleFullscreen() {
+  NOTIMPLEMENTED();
+}
+
+void PlatformWindowAndroid::Maximize() {
+  NOTIMPLEMENTED();
+}
+
+void PlatformWindowAndroid::Minimize() {
+  NOTIMPLEMENTED();
+}
+
+void PlatformWindowAndroid::Restore() {
+  NOTIMPLEMENTED();
+}
+
+void PlatformWindowAndroid::SetCursor(PlatformCursor cursor) {
+  NOTIMPLEMENTED();
+}
+
+void PlatformWindowAndroid::MoveCursorTo(const gfx::Point& location) {
+  NOTIMPLEMENTED();
+}
+
+void PlatformWindowAndroid::ConfineCursorToBounds(const gfx::Rect& bounds) {
+  NOTIMPLEMENTED();
+}
+
+}  // namespace ui