ui/platform_window: Introduce PlatformWindow for windowing primitives.

ui/platform_window/x11/x11_window.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 "ui/platform_window/x11/x11_window.h"
+
+#include <X11/extensions/XInput2.h>
+#include <X11/Xatom.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.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/events/platform/x11/x11_event_source.h"
+#include "ui/gfx/geometry/rect.h"
+#include "ui/gfx/x/x11_atom_cache.h"
+#include "ui/gfx/x/x11_types.h"
+#include "ui/platform_window/platform_window_delegate.h"
+
+namespace ui {
+
+namespace {
+
+const char* kAtomsToCache[] = {
+  "WM_DELETE_WINDOW",
+  "_NET_WM_PING",
+  "_NET_WM_PID",
+  NULL
+};
+
+XID FindXEventTarget(XEvent* xevent) {
+  XID target = xevent->xany.window;
+  if (xevent->type == GenericEvent)
+    target = static_cast<XIDeviceEvent*>(xevent->xcookie.data)->event;
+  return target;
+}
+
+}  // namespace
+
+X11Window::X11Window(PlatformWindowDelegate* delegate)
+    : delegate_(delegate),
+      xdisplay_(gfx::GetXDisplay()),
+      xwindow_(None),
+      xroot_window_(DefaultRootWindow(xdisplay_)),
+      atom_cache_(xdisplay_, kAtomsToCache),
+      window_mapped_(false) {
+  CHECK(delegate_);
+}
+
+X11Window::~X11Window() {
+  Destroy();
+}
+
+void X11Window::Destroy() {
+  if (xwindow_ == None)
+    return;
+
+  // Stop processing events.
+  PlatformEventSource::GetInstance()->RemovePlatformEventDispatcher(this);
+  XDestroyWindow(xdisplay_, xwindow_);
+  xwindow_ = None;
+}
+
+void X11Window::Show() {
+  if (window_mapped_)
+    return;
+
+  CHECK(PlatformEventSource::GetInstance());
+  PlatformEventSource::GetInstance()->AddPlatformEventDispatcher(this);
+
+  XSetWindowAttributes swa;
+  memset(&swa, 0, sizeof(swa));
+  swa.background_pixmap = None;
+  swa.override_redirect = False;
+  xwindow_ = XCreateWindow(xdisplay_,
+                           xroot_window_,
+                           requested_bounds_.x(),
+                           requested_bounds_.y(),
+                           requested_bounds_.width(),
+                           requested_bounds_.height(),
+                           0,               // border width
+                           CopyFromParent,  // depth
+                           InputOutput,
+                           CopyFromParent,  // visual
+                           CWBackPixmap | CWOverrideRedirect,
+                           &swa);
+
+  long event_mask = ButtonPressMask | ButtonReleaseMask | FocusChangeMask |
+                    KeyPressMask | KeyReleaseMask | EnterWindowMask |
+                    LeaveWindowMask | ExposureMask | VisibilityChangeMask |
+                    StructureNotifyMask | PropertyChangeMask |
+                    PointerMotionMask;
+  XSelectInput(xdisplay_, xwindow_, event_mask);
+
+  unsigned char mask[XIMaskLen(XI_LASTEVENT)];
+  memset(mask, 0, sizeof(mask));
+
+  XISetMask(mask, XI_TouchBegin);
+  XISetMask(mask, XI_TouchUpdate);
+  XISetMask(mask, XI_TouchEnd);
+  XISetMask(mask, XI_ButtonPress);
+  XISetMask(mask, XI_ButtonRelease);
+  XISetMask(mask, XI_Motion);
+
+  XIEventMask evmask;
+  evmask.deviceid = XIAllDevices;
+  evmask.mask_len = sizeof(mask);
+  evmask.mask = mask;
+  XISelectEvents(xdisplay_, xwindow_, &evmask, 1);
+  XFlush(xdisplay_);
+
+  ::Atom protocols[2];
+  protocols[0] = atom_cache_.GetAtom("WM_DELETE_WINDOW");
+  protocols[1] = atom_cache_.GetAtom("_NET_WM_PING");
+  XSetWMProtocols(xdisplay_, xwindow_, protocols, 2);
+
+  // We need a WM_CLIENT_MACHINE and WM_LOCALE_NAME value so we integrate with
+  // the desktop environment.
+  XSetWMProperties(
+      xdisplay_, xwindow_, NULL, NULL, NULL, 0, NULL, NULL, NULL);
+
+  // Likewise, the X server needs to know this window's pid so it knows which
+  // program to kill if the window hangs.
+  // XChangeProperty() expects "pid" to be long.
+  COMPILE_ASSERT(sizeof(long) >= sizeof(pid_t), pid_t_bigger_than_long);
+  long pid = getpid();
+  XChangeProperty(xdisplay_,
+                  xwindow_,
+                  atom_cache_.GetAtom("_NET_WM_PID"),
+                  XA_CARDINAL,
+                  32,
+                  PropModeReplace,
+                  reinterpret_cast<unsigned char*>(&pid),
+                  1);
+  // Before we map the window, set size hints. Otherwise, some window managers
+  // will ignore toplevel XMoveWindow commands.
+  XSizeHints size_hints;
+  size_hints.flags = PPosition | PWinGravity;
+  size_hints.x = requested_bounds_.x();
+  size_hints.y = requested_bounds_.y();
+  // Set StaticGravity so that the window position is not affected by the
+  // frame width when running with window manager.
+  size_hints.win_gravity = StaticGravity;
+  XSetWMNormalHints(xdisplay_, xwindow_, &size_hints);
+
+  delegate_->OnAcceleratedWidgetAvailable(xwindow_);
+
+  XMapWindow(xdisplay_, xwindow_);
+
+  // We now block until our window is mapped. Some X11 APIs will crash and
+  // burn if passed |xwindow_| before the window is mapped, and XMapWindow is
+  // asynchronous.
+  if (X11EventSource::GetInstance())
+    X11EventSource::GetInstance()->BlockUntilWindowMapped(xwindow_);
+  window_mapped_ = true;
+}
+
+void X11Window::Hide() {
+  if (!window_mapped_)
+    return;
+  XWithdrawWindow(xdisplay_, xwindow_, 0);
+  window_mapped_ = false;
+}
+
+void X11Window::Close() {
+  Destroy();
+}
+
+void X11Window::SetBounds(const gfx::Rect& bounds) {
+  requested_bounds_ = bounds;
+  if (!window_mapped_)
+    return;
+  XWindowChanges changes = {0};
+  unsigned value_mask = CWX | CWY | CWWidth | CWHeight;
+  changes.x = bounds.x();
+  changes.y = bounds.y();
+  changes.width = bounds.width();
+  changes.height = bounds.height();
+  XConfigureWindow(xdisplay_, xwindow_, value_mask, &changes);
+}
+
+void X11Window::SetCapture() {}
+
+void X11Window::ReleaseCapture() {}
+
+void X11Window::ToggleFullscreen() {}
+
+void X11Window::Maximize() {}
+
+void X11Window::Minimize() {}
+
+void X11Window::Restore() {}
+
+bool X11Window::CanDispatchEvent(const PlatformEvent& event) {
+  return FindXEventTarget(event) == xwindow_;
+}
+
+uint32_t X11Window::DispatchEvent(const PlatformEvent& event) {
+  XEvent* xev = event;
+  switch (xev->type) {
+    case EnterNotify: {
+      // EnterNotify creates ET_MOUSE_MOVED. Mark as synthesized as this is
+      // not real mouse move event.
+      MouseEvent mouse_event(xev);
+      CHECK_EQ(ET_MOUSE_MOVED, mouse_event.type());
+      mouse_event.set_flags(mouse_event.flags() | EF_IS_SYNTHESIZED);
+      delegate_->DispatchEvent(&mouse_event);
+      break;
+    }
+    case LeaveNotify: {
+      MouseEvent mouse_event(xev);
+      delegate_->DispatchEvent(&mouse_event);
+      break;
+    }
+
+    case Expose: {
+      gfx::Rect damage_rect(xev->xexpose.x,
+                            xev->xexpose.y,
+                            xev->xexpose.width,
+                            xev->xexpose.height);
+      delegate_->OnDamageRect(damage_rect);
+      break;
+    }
+
+    case KeyPress:
+    case KeyRelease: {
+      KeyEvent key_event(xev, false);
+      delegate_->DispatchEvent(&key_event);
+      break;
+    }
+
+    case ButtonPress:
+    case ButtonRelease: {
+      switch (EventTypeFromNative(xev)) {
+        case ET_MOUSEWHEEL: {
+          MouseWheelEvent mouseev(xev);
+          delegate_->DispatchEvent(&mouseev);
+          break;
+        }
+        case ET_MOUSE_PRESSED:
+        case ET_MOUSE_RELEASED: {
+          MouseEvent mouseev(xev);
+          delegate_->DispatchEvent(&mouseev);
+          break;
+        }
+        case ET_UNKNOWN:
+          // No event is created for X11-release events for mouse-wheel
+          // buttons.
+          break;
+        default:
+          NOTREACHED();
+      }
+      break;
+    }
+
+    case FocusOut:
+      if (xev->xfocus.mode != NotifyGrab)
+        delegate_->OnLostCapture();
+      break;
+
+    case ConfigureNotify: {
+      DCHECK_EQ(xwindow_, xev->xconfigure.event);
+      DCHECK_EQ(xwindow_, xev->xconfigure.window);
+      gfx::Rect bounds(xev->xconfigure.x,
+                       xev->xconfigure.y,
+                       xev->xconfigure.width,
+                       xev->xconfigure.height);
+      delegate_->OnBoundsChanged(bounds);
+      break;
+    }
+
+    case ClientMessage: {
+      Atom message = static_cast<Atom>(xev->xclient.data.l[0]);
+      if (message == atom_cache_.GetAtom("WM_DELETE_WINDOW")) {
+        delegate_->OnCloseRequest();
+      } else if (message == atom_cache_.GetAtom("_NET_WM_PING")) {
+        XEvent reply_event = *xev;
+        reply_event.xclient.window = xroot_window_;
+
+        XSendEvent(xdisplay_,
+                   reply_event.xclient.window,
+                   False,
+                   SubstructureRedirectMask | SubstructureNotifyMask,
+                   &reply_event);
+        XFlush(xdisplay_);
+      }
+      break;
+    }
+  }
+  return POST_DISPATCH_STOP_PROPAGATION;
+}
+
+}  // namespace ui