Start of display management for mus

ui/views/mus/screen_mus.cc

+// Copyright 2016 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/views/mus/screen_mus.h"
+
+#include "mojo/converters/geometry/geometry_type_converters.h"
+#include "mojo/shell/public/cpp/application_connection.h"
+#include "mojo/shell/public/cpp/application_impl.h"
+#include "ui/gfx/display_finder.h"
+#include "ui/gfx/display_observer.h"
+
+namespace mojo {
+
+template <>
+struct TypeConverter<gfx::Display, mus::mojom::DisplayPtr> {
+  static gfx::Display Convert(const mus::mojom::DisplayPtr& input) {
+    gfx::Display result(input->id, input->bounds.To<gfx::Rect>());
+    result.set_work_area(input->work_area.To<gfx::Rect>());
+    result.set_device_scale_factor(input->device_pixel_ratio);
+    switch (input->rotation) {
+      case mus::mojom::Rotation::VALUE_0:
+        result.set_rotation(gfx::Display::ROTATE_0);
+        break;
+      case mus::mojom::Rotation::VALUE_90:
+        result.set_rotation(gfx::Display::ROTATE_90);
+        break;
+      case mus::mojom::Rotation::VALUE_180:
+        result.set_rotation(gfx::Display::ROTATE_180);
+        break;
+      case mus::mojom::Rotation::VALUE_270:
+        result.set_rotation(gfx::Display::ROTATE_270);
+        break;
+    }
+    switch (input->touch_support) {
+      case mus::mojom::TouchSupport::UNKNOWN:
+        result.set_touch_support(gfx::Display::TOUCH_SUPPORT_UNKNOWN);
+        break;
+      case mus::mojom::TouchSupport::AVAILABLE:
+        result.set_touch_support(gfx::Display::TOUCH_SUPPORT_AVAILABLE);
+        break;
+      case mus::mojom::TouchSupport::UNAVAILABLE:
+        result.set_touch_support(gfx::Display::TOUCH_SUPPORT_UNAVAILABLE);
+        break;
+    }
+    return result;
+  }
+};
+
+}  // namespace mojo
+
+namespace views {
+
+ScreenMus::ScreenMus()
+    : primary_display_index_(0), display_manager_observer_binding_(this) {}
+
+ScreenMus::~ScreenMus() {}
+
+void ScreenMus::Init(mojo::ApplicationImpl* app) {
+  gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE, this);
+
+  app->ConnectToService("mojo:mus", &display_manager_);
+
+  display_manager_->AddObserver(
+      display_manager_observer_binding_.CreateInterfacePtrAndBind());
+  // We need the set of displays before we can continue. Wait for it.
+  display_manager_observer_binding_.WaitForIncomingMethodCall();
+
+  // The WaitForIncomingMethodCall() should have supplied the set of Displays.
+  DCHECK(displays_.size());
+}
+
+int ScreenMus::FindDisplayIndexById(int64_t id) const {
+  for (size_t i = 0; i < displays_.size(); ++i) {
+    if (displays_[i].id() == id)
+      return static_cast<int>(i);
+  }
+  return -1;
+}
+
+void ScreenMus::ProcessDisplayChanged(const gfx::Display& changed_display,
+                                      bool is_primary) {
+  const int display_index = FindDisplayIndexById(changed_display.id());
+  if (display_index == -1) {
+    displays_.push_back(changed_display);
+    if (is_primary)
+      primary_display_index_ = static_cast<int>(displays_.size()) - 1;
+    FOR_EACH_OBSERVER(gfx::DisplayObserver, observers_,
+                      OnDisplayAdded(changed_display));
+    return;
+  }
+
+  gfx::Display* local_display = &displays_[display_index];
+  uint32_t changed_values = 0;
+  if (is_primary && display_index != primary_display_index_) {
+    primary_display_index_ = display_index;
+    // ash::DisplayManager only notifies for the Display gaining primary, not
+    // the one losing it.
+    changed_values |= gfx::DisplayObserver::DISPLAY_METRIC_PRIMARY;
+  }
+  if (local_display->bounds() != changed_display.bounds()) {
+    local_display->set_bounds(changed_display.bounds());
+    changed_values |= gfx::DisplayObserver::DISPLAY_METRIC_BOUNDS;
+  }
+  if (local_display->work_area() != changed_display.work_area()) {
+    local_display->set_work_area(changed_display.work_area());
+    changed_values |= gfx::DisplayObserver::DISPLAY_METRIC_WORK_AREA;
+  }
+  if (local_display->rotation() != changed_display.rotation()) {
+    local_display->set_rotation(changed_display.rotation());
+    changed_values |= gfx::DisplayObserver::DISPLAY_METRIC_ROTATION;
+  }
+  if (local_display->device_scale_factor() !=
+      changed_display.device_scale_factor()) {
+    local_display->set_device_scale_factor(
+        changed_display.device_scale_factor());
+    changed_values |= gfx::DisplayObserver::DISPLAY_METRIC_DEVICE_SCALE_FACTOR;
+  }
+  FOR_EACH_OBSERVER(gfx::DisplayObserver, observers_,
+                    OnDisplayMetricsChanged(*local_display, changed_values));
+}
+
+gfx::Point ScreenMus::GetCursorScreenPoint() {
+  NOTIMPLEMENTED();
+  return gfx::Point();
+}
+
+gfx::NativeWindow ScreenMus::GetWindowUnderCursor() {
+  NOTIMPLEMENTED();
+  return nullptr;
+}
+
+gfx::NativeWindow ScreenMus::GetWindowAtScreenPoint(const gfx::Point& point) {
+  NOTIMPLEMENTED();
+  return nullptr;
+}
+
+gfx::Display ScreenMus::GetPrimaryDisplay() const {
+  return displays_[primary_display_index_];
+}
+
+gfx::Display ScreenMus::GetDisplayNearestWindow(gfx::NativeView view) const {
+  NOTIMPLEMENTED();
+  return GetPrimaryDisplay();
+}
+
+gfx::Display ScreenMus::GetDisplayNearestPoint(const gfx::Point& point) const {
+  return *gfx::FindDisplayNearestPoint(displays_, point);
+}
+
+int ScreenMus::GetNumDisplays() const {
+  return static_cast<int>(displays_.size());
+}
+
+std::vector<gfx::Display> ScreenMus::GetAllDisplays() const {
+  return displays_;
+}
+
+gfx::Display ScreenMus::GetDisplayMatching(const gfx::Rect& match_rect) const {
+  const gfx::Display* match =
+      gfx::FindDisplayWithBiggestIntersection(displays_, match_rect);
+  return match ? *match : GetPrimaryDisplay();
+}
+
+void ScreenMus::AddObserver(gfx::DisplayObserver* observer) {
+  observers_.AddObserver(observer);
+}
+
+void ScreenMus::RemoveObserver(gfx::DisplayObserver* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+void ScreenMus::OnDisplays(mojo::Array<mus::mojom::DisplayPtr> displays) {
+  // This should only be called once from Init() before any observers have been
+  // added.
+  DCHECK(displays_.empty());
+  displays_ = displays.To<std::vector<gfx::Display>>();
+  for (size_t i = 0; i < displays.size(); ++i) {
+    if (displays[i]->is_primary)
+      primary_display_index_ = static_cast<int>(i);
+  }
+}
+
+void ScreenMus::OnDisplaysChanged(
+    mojo::Array<mus::mojom::DisplayPtr> transport_displays) {
+  for (size_t i = 0; i < transport_displays.size(); ++i) {
+    const bool is_primary = transport_displays[i]->is_primary;
+    ProcessDisplayChanged(transport_displays[i].To<gfx::Display>(), is_primary);
+  }
+}
+
+void ScreenMus::OnDisplayRemoved(int64_t id) {
+  const int index = FindDisplayIndexById(id);
+  DCHECK_NE(-1, index);
+  // Another display must become primary before the existing primary is
+  // removed.
+  DCHECK_NE(index, primary_display_index_);
+  const gfx::Display display = displays_[index];
+  FOR_EACH_OBSERVER(gfx::DisplayObserver, observers_,
+                    OnDisplayRemoved(display));
+}
+
+}  // namespace views