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// Copyright (c) 2012 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/widget/desktop_aura/x11_window_event_filter.h"
#include <X11/extensions/XInput.h>
#include <X11/extensions/XInput2.h>
#include <X11/Xatom.h>
#include <X11/Xlib.h>
#include "base/message_loop/message_pump_aurax11.h"
#include "ui/aura/root_window.h"
#include "ui/aura/window_delegate.h"
#include "ui/base/events/event.h"
#include "ui/base/events/event_utils.h"
#include "ui/base/hit_test.h"
#include "ui/views/widget/desktop_aura/desktop_activation_client.h"
#include "ui/views/widget/native_widget_aura.h"
namespace {
// These constants are defined in the Extended Window Manager Hints
// standard...and aren't in any header that I can find.
const int k_NET_WM_MOVERESIZE_SIZE_TOPLEFT = 0;
const int k_NET_WM_MOVERESIZE_SIZE_TOP = 1;
const int k_NET_WM_MOVERESIZE_SIZE_TOPRIGHT = 2;
const int k_NET_WM_MOVERESIZE_SIZE_RIGHT = 3;
const int k_NET_WM_MOVERESIZE_SIZE_BOTTOMRIGHT = 4;
const int k_NET_WM_MOVERESIZE_SIZE_BOTTOM = 5;
const int k_NET_WM_MOVERESIZE_SIZE_BOTTOMLEFT = 6;
const int k_NET_WM_MOVERESIZE_SIZE_LEFT = 7;
const int k_NET_WM_MOVERESIZE_MOVE = 8;
// This data structure represents additional hints that we send to the window
// manager and has a direct lineage back to Motif, which defined this de facto
// standard. This struct doesn't seem 64-bit safe though, but it's what GDK
// does.
typedef struct {
unsigned long flags;
unsigned long functions;
unsigned long decorations;
long input_mode;
unsigned long status;
} MotifWmHints;
// The bitflag in |flags| in MotifWmHints that signals that the reader should
// pay attention to the value in |decorations|.
const unsigned long kHintsDecorations = (1L << 1);
const char* kAtomsToCache[] = {
"_MOTIF_WM_HINTS",
"_NET_WM_MOVERESIZE",
NULL
};
} // namespace
namespace views {
X11WindowEventFilter::X11WindowEventFilter(
aura::RootWindow* root_window,
DesktopActivationClient* activation_client)
: activation_client_(activation_client),
xdisplay_(base::MessagePumpAuraX11::GetDefaultXDisplay()),
xwindow_(root_window->GetAcceleratedWidget()),
x_root_window_(DefaultRootWindow(xdisplay_)),
atom_cache_(xdisplay_, kAtomsToCache),
is_active_(false) {
}
X11WindowEventFilter::~X11WindowEventFilter() {
}
void X11WindowEventFilter::SetUseHostWindowBorders(bool use_os_border) {
MotifWmHints motif_hints;
memset(&motif_hints, 0, sizeof(motif_hints));
motif_hints.flags = kHintsDecorations;
motif_hints.decorations = use_os_border ? 1 : 0;
::Atom hint_atom = atom_cache_.GetAtom("_MOTIF_WM_HINTS");
XChangeProperty(base::MessagePumpAuraX11::GetDefaultXDisplay(),
xwindow_,
hint_atom,
hint_atom,
32,
PropModeReplace,
reinterpret_cast<unsigned char*>(&motif_hints),
sizeof(MotifWmHints)/sizeof(long));
}
void X11WindowEventFilter::OnMouseEvent(ui::MouseEvent* event) {
if (event->type() != ui::ET_MOUSE_PRESSED)
return;
if (!event->IsLeftMouseButton())
return;
aura::Window* target = static_cast<aura::Window*>(event->target());
int component =
target->delegate()->GetNonClientComponent(event->location());
if (component == HTCLIENT)
return;
// Get the |x_root_window_| location out of the native event.
if (event->native_event()) {
const gfx::Point x_root_location =
ui::EventSystemLocationFromNative(event->native_event());
if (DispatchHostWindowDragMovement(component, x_root_location))
event->StopPropagation();
}
}
bool X11WindowEventFilter::DispatchHostWindowDragMovement(
int hittest,
const gfx::Point& screen_location) {
int direction = -1;
switch (hittest) {
case HTBOTTOM:
direction = k_NET_WM_MOVERESIZE_SIZE_BOTTOM;
break;
case HTBOTTOMLEFT:
direction = k_NET_WM_MOVERESIZE_SIZE_BOTTOMLEFT;
break;
case HTBOTTOMRIGHT:
direction = k_NET_WM_MOVERESIZE_SIZE_BOTTOMRIGHT;
break;
case HTCAPTION:
direction = k_NET_WM_MOVERESIZE_MOVE;
break;
case HTLEFT:
direction = k_NET_WM_MOVERESIZE_SIZE_LEFT;
break;
case HTRIGHT:
direction = k_NET_WM_MOVERESIZE_SIZE_RIGHT;
break;
case HTTOP:
direction = k_NET_WM_MOVERESIZE_SIZE_TOP;
break;
case HTTOPLEFT:
direction = k_NET_WM_MOVERESIZE_SIZE_TOPLEFT;
break;
case HTTOPRIGHT:
direction = k_NET_WM_MOVERESIZE_SIZE_TOPRIGHT;
break;
default:
return false;
}
// We most likely have an implicit grab right here. We need to dump it
// because what we're about to do is tell the window manager
// that it's now responsible for moving the window around; it immediately
// grabs when it receives the event below.
XUngrabPointer(xdisplay_, CurrentTime);
XEvent event;
memset(&event, 0, sizeof(event));
event.xclient.type = ClientMessage;
event.xclient.display = xdisplay_;
event.xclient.window = xwindow_;
event.xclient.message_type = atom_cache_.GetAtom("_NET_WM_MOVERESIZE");
event.xclient.format = 32;
event.xclient.data.l[0] = screen_location.x();
event.xclient.data.l[1] = screen_location.y();
event.xclient.data.l[2] = direction;
event.xclient.data.l[3] = 0;
event.xclient.data.l[4] = 0;
XSendEvent(xdisplay_, x_root_window_, False,
SubstructureRedirectMask | SubstructureNotifyMask,
&event);
return true;
}
} // namespace views
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