Introdcue AshWindowTreeHost and move ash/chrome specific code in WTH to ash.

ash/host/ash_window_tree_host_x11.cc

+// Copyright 2014 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 "ash/host/ash_window_tree_host_x11.h"
+
+#include <X11/extensions/Xfixes.h>
+#include <X11/extensions/XInput2.h>
+#include <X11/Xatom.h>
+#include <X11/Xlib.h>
+
+#include <string>
+#include <vector>
+
+#include "ash/host/root_window_transformer.h"
+#include "base/basictypes.h"
+#include "base/command_line.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_util.h"
+#include "base/sys_info.h"
+#include "ui/aura/client/screen_position_client.h"
+#include "ui/aura/env.h"
+#include "ui/aura/window.h"
+#include "ui/base/x/x11_util.h"
+#include "ui/events/event.h"
+#include "ui/events/event_switches.h"
+#include "ui/events/event_utils.h"
+#include "ui/events/platform/platform_event_observer.h"
+#include "ui/events/platform/x11/x11_event_source.h"
+#include "ui/events/x/device_data_manager.h"
+#include "ui/events/x/device_list_cache_x.h"
+#include "ui/events/x/touch_factory_x11.h"
+
+#include "ui/gfx/rect.h"
+#include "ui/gfx/screen.h"
+
+namespace ash {
+
+// Accomplishes 2 tasks concerning touch event calibration:
+// 1. Being a message-pump observer,
+//    routes all the touch events to the X root window,
+//    where they can be calibrated later.
+// 2. Has the Calibrate method that does the actual bezel calibration,
+//    when invoked from X root window's event dispatcher.
+class AshWindowTreeHostX11::TouchEventCalibrate
+    : public ui::PlatformEventObserver {
+ public:
+  TouchEventCalibrate() : left_(0), right_(0), top_(0), bottom_(0) {
+    if (ui::PlatformEventSource::GetInstance())
+      ui::PlatformEventSource::GetInstance()->AddPlatformEventObserver(this);
+#if defined(USE_XI2_MT)
+    std::vector<std::string> parts;
+    if (Tokenize(CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
+                     switches::kTouchCalibration),
+                 ",",
+                 &parts) >= 4) {
+      if (!base::StringToInt(parts[0], &left_))
+        DLOG(ERROR) << "Incorrect left border calibration value passed.";
+      if (!base::StringToInt(parts[1], &right_))
+        DLOG(ERROR) << "Incorrect right border calibration value passed.";
+      if (!base::StringToInt(parts[2], &top_))
+        DLOG(ERROR) << "Incorrect top border calibration value passed.";
+      if (!base::StringToInt(parts[3], &bottom_))
+        DLOG(ERROR) << "Incorrect bottom border calibration value passed.";
+    }
+#endif  // defined(USE_XI2_MT)
+  }
+
+  virtual ~TouchEventCalibrate() {
+    if (ui::PlatformEventSource::GetInstance())
+      ui::PlatformEventSource::GetInstance()->RemovePlatformEventObserver(this);
+  }
+
+  // Modify the location of the |event|,
+  // expanding it from |bounds| to (|bounds| + bezels).
+  // Required when touchscreen is bigger than screen (i.e. has bezels),
+  // because we receive events in touchscreen coordinates,
+  // which need to be expanded when converting to screen coordinates,
+  // so that location on bezels will be outside of screen area.
+  void Calibrate(ui::TouchEvent* event, const gfx::Rect& bounds) {
+#if defined(USE_XI2_MT)
+    int x = event->x();
+    int y = event->y();
+
+    if (!left_ && !right_ && !top_ && !bottom_)
+      return;
+
+    const int resolution_x = bounds.width();
+    const int resolution_y = bounds.height();
+    // The "grace area" (10% in this case) is to make it easier for the user to
+    // navigate to the corner.
+    const double kGraceAreaFraction = 0.1;
+    if (left_ || right_) {
+      // Offset the x position to the real
+      x -= left_;
+      // Check if we are in the grace area of the left side.
+      // Note: We might not want to do this when the gesture is locked?
+      if (x < 0 && x > -left_ * kGraceAreaFraction)
+        x = 0;
+      // Check if we are in the grace area of the right side.
+      // Note: We might not want to do this when the gesture is locked?
+      if (x > resolution_x - left_ &&
+          x < resolution_x - left_ + right_ * kGraceAreaFraction)
+        x = resolution_x - left_;
+      // Scale the screen area back to the full resolution of the screen.
+      x = (x * resolution_x) / (resolution_x - (right_ + left_));
+    }
+    if (top_ || bottom_) {
+      // When there is a top bezel we add our border,
+      y -= top_;
+
+      // Check if we are in the grace area of the top side.
+      // Note: We might not want to do this when the gesture is locked?
+      if (y < 0 && y > -top_ * kGraceAreaFraction)
+        y = 0;
+
+      // Check if we are in the grace area of the bottom side.
+      // Note: We might not want to do this when the gesture is locked?
+      if (y > resolution_y - top_ &&
+          y < resolution_y - top_ + bottom_ * kGraceAreaFraction)
+        y = resolution_y - top_;
+      // Scale the screen area back to the full resolution of the screen.
+      y = (y * resolution_y) / (resolution_y - (bottom_ + top_));
+    }
+
+    // Set the modified coordinate back to the event.
+    if (event->root_location() == event->location()) {
+      // Usually those will be equal,
+      // if not, I am not sure what the correct value should be.
+      event->set_root_location(gfx::Point(x, y));
+    }
+    event->set_location(gfx::Point(x, y));
+#endif  // defined(USE_XI2_MT)
+  }
+
+ private:
+  // ui::PlatformEventObserver:
+  virtual void WillProcessEvent(const ui::PlatformEvent& event) OVERRIDE {
+#if defined(USE_XI2_MT)
+    if (event->type == GenericEvent &&
+        (event->xgeneric.evtype == XI_TouchBegin ||
+         event->xgeneric.evtype == XI_TouchUpdate ||
+         event->xgeneric.evtype == XI_TouchEnd)) {
+      XIDeviceEvent* xievent = static_cast<XIDeviceEvent*>(event->xcookie.data);
+      xievent->event = xievent->root;
+      xievent->event_x = xievent->root_x;
+      xievent->event_y = xievent->root_y;
+    }
+#endif  // defined(USE_XI2_MT)
+  }
+
+  virtual void DidProcessEvent(const ui::PlatformEvent& event) OVERRIDE {}
+
+  // The difference in screen's native resolution pixels between
+  // the border of the touchscreen and the border of the screen,
+  // aka bezel sizes.
+  int left_;
+  int right_;
+  int top_;
+  int bottom_;
+
+  DISALLOW_COPY_AND_ASSIGN(TouchEventCalibrate);
+};
+
+////////////////////////////////////////////////////////////////////////////////
+// AshWindowTreeHostX11
+
+AshWindowTreeHostX11::AshWindowTreeHostX11(const gfx::Rect& initial_bounds)
+    : WindowTreeHostX11(initial_bounds),
+      is_internal_display_(false),
+      touch_calibrate_(new TouchEventCalibrate),
+      transformer_helper_(this) {
+  aura::Env::GetInstance()->AddObserver(this);
+}
+
+AshWindowTreeHostX11::~AshWindowTreeHostX11() {
+  aura::Env::GetInstance()->RemoveObserver(this);
+  UnConfineCursor();
+}
+
+void AshWindowTreeHostX11::ToggleFullScreen() { NOTIMPLEMENTED(); }
+
+bool AshWindowTreeHostX11::ConfineCursorToRootWindow() {
+#if XFIXES_MAJOR >= 5
+  DCHECK(!pointer_barriers_.get());
+  if (pointer_barriers_)
+    return false;
+  pointer_barriers_.reset(new XID[4]);
+  gfx::Rect barrier(bounds());
+  barrier.Inset(transformer_helper_.GetHostInsets());
+  // Horizontal, top barriers.
+  pointer_barriers_[0] = XFixesCreatePointerBarrier(xdisplay(),
+                                                    x_root_window(),
+                                                    barrier.x(),
+                                                    barrier.y(),
+                                                    barrier.right(),
+                                                    barrier.y(),
+                                                    BarrierPositiveY,
+                                                    0,
+                                                    XIAllDevices);
+  // Horizontal, bottom barriers.
+  pointer_barriers_[1] = XFixesCreatePointerBarrier(xdisplay(),
+                                                    x_root_window(),
+                                                    barrier.x(),
+                                                    barrier.bottom(),
+                                                    barrier.right(),
+                                                    barrier.bottom(),
+                                                    BarrierNegativeY,
+                                                    0,
+                                                    XIAllDevices);
+  // Vertical, left  barriers.
+  pointer_barriers_[2] = XFixesCreatePointerBarrier(xdisplay(),
+                                                    x_root_window(),
+                                                    barrier.x(),
+                                                    barrier.y(),
+                                                    barrier.x(),
+                                                    barrier.bottom(),
+                                                    BarrierPositiveX,
+                                                    0,
+                                                    XIAllDevices);
+  // Vertical, right barriers.
+  pointer_barriers_[3] = XFixesCreatePointerBarrier(xdisplay(),
+                                                    x_root_window(),
+                                                    barrier.right(),
+                                                    barrier.y(),
+                                                    barrier.right(),
+                                                    barrier.bottom(),
+                                                    BarrierNegativeX,
+                                                    0,
+                                                    XIAllDevices);
+#endif
+  return true;
+}
+
+void AshWindowTreeHostX11::UnConfineCursor() {
+#if XFIXES_MAJOR >= 5
+  if (pointer_barriers_) {
+    XFixesDestroyPointerBarrier(xdisplay(), pointer_barriers_[0]);
+    XFixesDestroyPointerBarrier(xdisplay(), pointer_barriers_[1]);
+    XFixesDestroyPointerBarrier(xdisplay(), pointer_barriers_[2]);
+    XFixesDestroyPointerBarrier(xdisplay(), pointer_barriers_[3]);
+    pointer_barriers_.reset();
+  }
+#endif
+}
+
+void AshWindowTreeHostX11::SetRootWindowTransformer(
+    scoped_ptr<RootWindowTransformer> transformer) {
+  transformer_helper_.SetRootWindowTransformer(transformer.Pass());
+  UpdateIsInternalDisplay();
+  if (pointer_barriers_) {
+    UnConfineCursor();
+    ConfineCursorToRootWindow();
+  }
+}
+
+aura::WindowTreeHost* AshWindowTreeHostX11::AsWindowTreeHost() { return this; }
+
+void AshWindowTreeHostX11::SetBounds(const gfx::Rect& bounds) {
+  WindowTreeHostX11::SetBounds(bounds);
+  UpdateIsInternalDisplay();
+  if (pointer_barriers_) {
+    UnConfineCursor();
+    ConfineCursorToRootWindow();
+  }
+}
+
+gfx::Transform AshWindowTreeHostX11::GetRootTransform() const {
+  return transformer_helper_.GetTransform();
+}
+
+void AshWindowTreeHostX11::SetRootTransform(const gfx::Transform& transform) {
+  transformer_helper_.SetTransform(transform);
+}
+
+gfx::Transform AshWindowTreeHostX11::GetInverseRootTransform() const {
+  return transformer_helper_.GetInverseTransform();
+}
+
+void AshWindowTreeHostX11::UpdateRootWindowSize(const gfx::Size& host_size) {
+  transformer_helper_.UpdateWindowSize(host_size);
+}
+
+void AshWindowTreeHostX11::OnCursorVisibilityChangedNative(bool show) {
+  SetCrOSTapPaused(!show);
+}
+
+void AshWindowTreeHostX11::OnWindowInitialized(aura::Window* window) {}
+
+void AshWindowTreeHostX11::OnHostInitialized(aura::WindowTreeHost* host) {
+  // UpdateIsInternalDisplay relies on RootWindowSettings' display_id being set
+  // available by the time WED::Init is called. (set in
+  // DisplayManager::CreateRootWindowForDisplay)
+  // Ready when NotifyHostInitialized is called from WED::Init.
+  if (host != AsWindowTreeHost())
+    return;
+  UpdateIsInternalDisplay();
+
+  // We have to enable Tap-to-click by default because the cursor is set to
+  // visible in Shell::InitRootWindowController.
+  SetCrOSTapPaused(false);
+}
+
+void AshWindowTreeHostX11::OnConfigureNotify() {
+  UpdateIsInternalDisplay();
+
+  // Always update barrier and mouse location because |bounds_| might
+  // have already been updated in |SetBounds|.
+  if (pointer_barriers_) {
+    UnConfineCursor();
+    ConfineCursorToRootWindow();
+  }
+}
+
+void AshWindowTreeHostX11::TranslateAndDispatchLocatedEvent(
+    ui::LocatedEvent* event) {
+  switch (event->type()) {
+    case ui::ET_TOUCH_MOVED:
+    case ui::ET_TOUCH_PRESSED:
+    case ui::ET_TOUCH_CANCELLED:
+    case ui::ET_TOUCH_RELEASED: {
+      ui::TouchEvent* touchev = static_cast<ui::TouchEvent*>(event);
+      if (base::SysInfo::IsRunningOnChromeOS()) {
+        // X maps the touch-surface to the size of the X root-window.
+        // In multi-monitor setup, Coordinate Transformation Matrix
+        // repositions the touch-surface onto part of X root-window
+        // containing aura root-window corresponding to the touchscreen.
+        // However, if aura root-window has non-zero origin,
+        // we need to relocate the event into aura root-window coordinates.
+        touchev->Relocate(bounds().origin());
+#if defined(USE_XI2_MT)
+        if (is_internal_display_)
+          touch_calibrate_->Calibrate(touchev, bounds());
+#endif  // defined(USE_XI2_MT)
+      }
+      break;
+    }
+    default: {
+      aura::Window* root_window = window();
+      aura::client::ScreenPositionClient* screen_position_client =
+          aura::client::GetScreenPositionClient(root_window);
+      gfx::Rect local(bounds().size());
+
+      if (screen_position_client && !local.Contains(event->location())) {
+        gfx::Point location(event->location());
+        // In order to get the correct point in screen coordinates
+        // during passive grab, we first need to find on which host window
+        // the mouse is on, and find out the screen coordinates on that
+        // host window, then convert it back to this host window's coordinate.
+        screen_position_client->ConvertHostPointToScreen(root_window,
+                                                         &location);
+        screen_position_client->ConvertPointFromScreen(root_window, &location);
+        ConvertPointToHost(&location);
+        event->set_location(location);
+        event->set_root_location(location);
+      }
+      break;
+    }
+  }
+  SendEventToProcessor(event);
+}
+
+void AshWindowTreeHostX11::UpdateIsInternalDisplay() {
+  aura::Window* root_window = window();
+  gfx::Screen* screen = gfx::Screen::GetScreenFor(root_window);
+  gfx::Display display = screen->GetDisplayNearestWindow(root_window);
+  DCHECK(display.is_valid());
+  is_internal_display_ = display.IsInternal();
+}
+
+void AshWindowTreeHostX11::SetCrOSTapPaused(bool state) {
+  if (!ui::IsXInput2Available())
+    return;
+  // Temporarily pause tap-to-click when the cursor is hidden.
+  Atom prop = atom_cache()->GetAtom("Tap Paused");
+  unsigned char value = state;
+  XIDeviceList dev_list =
+      ui::DeviceListCacheX::GetInstance()->GetXI2DeviceList(xdisplay());
+
+  // Only slave pointer devices could possibly have tap-paused property.
+  for (int i = 0; i < dev_list.count; i++) {
+    if (dev_list[i].use == XISlavePointer) {
+      Atom old_type;
+      int old_format;
+      unsigned long old_nvalues, bytes;
+      unsigned char* data;
+      int result = XIGetProperty(xdisplay(),
+                                 dev_list[i].deviceid,
+                                 prop,
+                                 0,
+                                 0,
+                                 False,
+                                 AnyPropertyType,
+                                 &old_type,
+                                 &old_format,
+                                 &old_nvalues,
+                                 &bytes,
+                                 &data);
+      if (result != Success)
+        continue;
+      XFree(data);
+      XIChangeProperty(xdisplay(),
+                       dev_list[i].deviceid,
+                       prop,
+                       XA_INTEGER,
+                       8,
+                       PropModeReplace,
+                       &value,
+                       1);
+    }
+  }
+}
+
+AshWindowTreeHost* AshWindowTreeHost::Create(const gfx::Rect& initial_bounds) {
+  return new AshWindowTreeHostX11(initial_bounds);
+}
+
+}  // namespace ash