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mojo/services/native_viewport/platform_viewport_x11.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 "mojo/services/native_viewport/platform_viewport.h"
+
+#include "base/command_line.h"
+#include "base/message_loop/message_loop.h"
+#include "mojo/converters/geometry/geometry_type_converters.h"
+#include "mojo/converters/input_events/input_events_type_converters.h"
+#include "mojo/converters/input_events/mojo_extended_key_event_data.h"
+#include "ui/events/event.h"
+#include "ui/events/event_utils.h"
+#include "ui/events/platform/platform_event_dispatcher.h"
+#include "ui/events/platform/platform_event_source.h"
+#include "ui/gfx/geometry/rect.h"
+#include "ui/platform_window/platform_window.h"
+#include "ui/platform_window/platform_window_delegate.h"
+#include "ui/platform_window/x11/x11_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 PlatformViewportX11 : public PlatformViewport,
+                            public ui::PlatformWindowDelegate {
+ public:
+  explicit PlatformViewportX11(Delegate* delegate) : delegate_(delegate) {
+  }
+
+  ~PlatformViewportX11() override {
+    // Destroy the platform-window while |this| is still alive.
+    platform_window_.reset();
+  }
+
+ private:
+  // Overridden from PlatformViewport:
+  void Init(const gfx::Rect& bounds) override {
+    CHECK(!event_source_);
+    CHECK(!platform_window_);
+
+    event_source_ = ui::PlatformEventSource::CreateDefault();
+
+    metrics_ = mojo::ViewportMetrics::New();
+    metrics_->size = mojo::Size::From(bounds.size());
+
+    platform_window_.reset(new ui::X11Window(this));
+    platform_window_->SetBounds(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.To<gfx::Size>(); }
+
+  void SetBounds(const gfx::Rect& bounds) override {
+    platform_window_->SetBounds(bounds);
+  }
+
+  // ui::PlatformWindowDelegate:
+  void OnBoundsChanged(const gfx::Rect& new_bounds) override {
+    metrics_->size = mojo::Size::From(new_bounds.size());
+    delegate_->OnMetricsChanged(metrics_.Clone());
+  }
+
+  void OnDamageRect(const gfx::Rect& damaged_region) override {}
+
+  void DispatchEvent(ui::Event* event) override {
+    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;
+    }
+
+    // We want to emulate the WM_CHAR generation behaviour of Windows.
+    //
+    // On Linux, we've previously inserted characters by having
+    // InputMethodAuraLinux take all key down events and send a character event
+    // to the TextInputClient. This causes a mismatch in code that has to be
+    // shared between Windows and Linux, including blink code. Now that we're
+    // trying to have one way of doing things, we need to standardize on and
+    // emulate Windows character events.
+    //
+    // This is equivalent to what we're doing in the current Linux port, but
+    // done once instead of done multiple times in different places.
+    if (event->type() == ui::ET_KEY_PRESSED) {
+      ui::KeyEvent* key_press_event = static_cast<ui::KeyEvent*>(event);
+      ui::KeyEvent char_event(key_press_event->GetCharacter(),
+                              key_press_event->key_code(),
+                              key_press_event->flags());
+
+      DCHECK_EQ(key_press_event->GetCharacter(), char_event.GetCharacter());
+      DCHECK_EQ(key_press_event->key_code(), char_event.key_code());
+      DCHECK_EQ(key_press_event->flags(), char_event.flags());
+
+      char_event.SetExtendedKeyEventData(
+          make_scoped_ptr(new mojo::MojoExtendedKeyEventData(
+              key_press_event->GetLocatedWindowsKeyboardCode(),
+              key_press_event->GetText(),
+              key_press_event->GetUnmodifiedText())));
+      char_event.set_platform_keycode(key_press_event->platform_keycode());
+
+      delegate_->OnEvent(mojo::Event::From(char_event));
+    }
+  }
+
+  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);
+  }
+
+  void OnActivationChanged(bool active) override {}
+
+  scoped_ptr<ui::PlatformEventSource> event_source_;
+  scoped_ptr<ui::PlatformWindow> platform_window_;
+  Delegate* delegate_;
+  mojo::ViewportMetricsPtr metrics_;
+
+  DISALLOW_COPY_AND_ASSIGN(PlatformViewportX11);
+};
+
+// static
+scoped_ptr<PlatformViewport> PlatformViewport::Create(Delegate* delegate) {
+  return make_scoped_ptr(new PlatformViewportX11(delegate));
+}
+
+}  // namespace native_viewport