[wip] ozonex: X11 backend for ozone.

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 <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.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;
+}
+
+class X11Window : public PlatformWindow,
+                  public PlatformEventDispatcher {
+ public:
+  explicit X11Window(PlatformWindowDelegate* delegate)
+      : delegate_(delegate),
+        xdisplay_(gfx::GetXDisplay()),
+        xwindow_(None),
+        xroot_window_(DefaultRootWindow(xdisplay_)),
+        atom_cache_(xdisplay_, kAtomsToCache),
+        window_mapped_(false) {
+    CHECK(delegate_);
+  }
+
+  virtual ~X11Window() {
+    Destroy();
+  }
+
+ private:
+  void Destroy() {
+    if (xwindow_ == None)
+      return;
+
+    // Stop processing events.
+    PlatformEventSource::GetInstance()->RemovePlatformEventDispatcher(this);
+    XDestroyWindow(xdisplay_, xwindow_);
+    xwindow_ = None;
+  }
+
+  // PlatformWindow:
+  virtual void Show() OVERRIDE {
+    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);
+
+#if 0
+    unsigned char mask[XIMaskLen(XI_LASTEVENT)];
+    memset(mask, 0, sizeof(mask));
+
+#if defined(USE_XI2_MT)
+    XISetMask(mask, XI_TouchBegin);
+    XISetMask(mask, XI_TouchUpdate);
+    XISetMask(mask, XI_TouchEnd);
+#endif
+    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);
+#endif
+    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);
+
+    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;
+  }
+
+  virtual void Hide() OVERRIDE {
+    if (!window_mapped_)
+      return;
+    XWithdrawWindow(xdisplay_, xwindow_, 0);
+    window_mapped_ = false;
+  }
+
+  virtual void Close() OVERRIDE {
+    Destroy();
+  }
+
+  virtual void SetBounds(const gfx::Rect& bounds) OVERRIDE {
+    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);
+  }
+
+  virtual void SetCapture() OVERRIDE {}
+
+  virtual void ReleaseCapture() OVERRIDE {}
+
+  virtual void ToggleFullscreen() OVERRIDE {}
+
+  virtual void Maximize() OVERRIDE {}
+
+  virtual void Minimize() OVERRIDE {}
+
+  virtual void Restore() OVERRIDE {}
+
+  // PlatformEventDispatcher:
+  virtual bool CanDispatchEvent(const PlatformEvent& event) OVERRIDE {
+    return FindXEventTarget(event) == xwindow_;
+  }
+
+  virtual uint32_t DispatchEvent(const PlatformEvent& event) OVERRIDE {
+    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: {
+        ui::KeyEvent key_event(xev, false);
+        delegate_->DispatchEvent(&key_event);
+        break;
+      }
+
+      case ButtonPress:
+      case ButtonRelease: {
+        switch (ui::EventTypeFromNative(xev)) {
+          case ui::ET_MOUSEWHEEL: {
+            ui::MouseWheelEvent mouseev(xev);
+            delegate_->DispatchEvent(&mouseev);
+            break;
+          }
+          case ui::ET_MOUSE_PRESSED:
+          case ui::ET_MOUSE_RELEASED: {
+            ui::MouseEvent mouseev(xev);
+            delegate_->DispatchEvent(&mouseev);
+            break;
+          }
+          case ui::ET_UNKNOWN:
+            // No event is created for X11-release events for mouse-wheel
+            // buttons.
+            break;
+          default:
+            NOTREACHED();
+        }
+        break;
+      }
+
+      case MotionNotify: {
+        ui::MouseEvent mouseev(xev);
+        delegate_->DispatchEvent(&mouseev);
+        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;
+      }
+    }
+    return POST_DISPATCH_STOP_PROPAGATION;
+  }
+
+  PlatformWindowDelegate* delegate_;
+
+  XDisplay* xdisplay_;
+  XID xwindow_;
+  XID xroot_window_;
+  X11AtomCache atom_cache_;
+
+  gfx::Rect requested_bounds_;
+  bool window_mapped_;
+
+  DISALLOW_COPY_AND_ASSIGN(X11Window);
+};
+
+}  // namespace
+
+scoped_ptr<PlatformWindow>
+CreatePlatformWindow(PlatformWindowDelegate* delegate) {
+  return scoped_ptr<PlatformWindow>(new X11Window(delegate));
+}
+
+}  // namespace ui