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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 "ui/aura/client/aura_constants.h"
#include "ui/aura/window.h"
#include "ui/aura/window_delegate.h"
#include "ui/aura/window_tree_host.h"
#include "ui/base/hit_test.h"
#include "ui/events/event.h"
#include "ui/events/event_utils.h"
#include "ui/gfx/display.h"
#include "ui/gfx/screen.h"
#include "ui/gfx/x/x11_types.h"
#include "ui/views/linux_ui/linux_ui.h"
#include "ui/views/widget/desktop_aura/desktop_window_tree_host.h"
#include "ui/views/widget/native_widget_aura.h"
#include "ui/views/widget/widget.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;
const char* kAtomsToCache[] = {
"_NET_WM_MOVERESIZE",
NULL
};
} // namespace
namespace views {
X11WindowEventFilter::X11WindowEventFilter(
DesktopWindowTreeHost* window_tree_host)
: xdisplay_(gfx::GetXDisplay()),
xwindow_(window_tree_host->AsWindowTreeHost()->GetAcceleratedWidget()),
x_root_window_(DefaultRootWindow(xdisplay_)),
atom_cache_(xdisplay_, kAtomsToCache),
window_tree_host_(window_tree_host),
click_component_(HTNOWHERE) {
}
X11WindowEventFilter::~X11WindowEventFilter() {
}
void X11WindowEventFilter::OnMouseEvent(ui::MouseEvent* event) {
if (event->type() != ui::ET_MOUSE_PRESSED)
return;
aura::Window* target = static_cast<aura::Window*>(event->target());
if (!target->delegate())
return;
int previous_click_component = HTNOWHERE;
int component =
target->delegate()->GetNonClientComponent(event->location());
if (event->IsLeftMouseButton()) {
previous_click_component = click_component_;
click_component_ = component;
}
if (component == HTCAPTION) {
OnClickedCaption(event, previous_click_component);
} else if (component == HTMAXBUTTON) {
OnClickedMaximizeButton(event);
} else {
// Get the |x_root_window_| location out of the native event.
if (event->IsLeftMouseButton() && event->native_event()) {
const gfx::Point x_root_location =
ui::EventSystemLocationFromNative(event->native_event());
if (target->GetProperty(aura::client::kCanResizeKey) &&
DispatchHostWindowDragMovement(component, x_root_location)) {
event->StopPropagation();
}
}
}
}
void X11WindowEventFilter::OnClickedCaption(ui::MouseEvent* event,
int previous_click_component) {
aura::Window* target = static_cast<aura::Window*>(event->target());
if (event->IsMiddleMouseButton()) {
LinuxUI::NonClientMiddleClickAction action =
LinuxUI::MIDDLE_CLICK_ACTION_LOWER;
LinuxUI* linux_ui = LinuxUI::instance();
if (linux_ui)
action = linux_ui->GetNonClientMiddleClickAction();
switch (action) {
case LinuxUI::MIDDLE_CLICK_ACTION_NONE:
break;
case LinuxUI::MIDDLE_CLICK_ACTION_LOWER:
XLowerWindow(xdisplay_, xwindow_);
break;
case LinuxUI::MIDDLE_CLICK_ACTION_MINIMIZE:
window_tree_host_->Minimize();
break;
case LinuxUI::MIDDLE_CLICK_ACTION_TOGGLE_MAXIMIZE:
if (target->GetProperty(aura::client::kCanMaximizeKey))
ToggleMaximizedState();
break;
}
event->SetHandled();
return;
}
if (event->IsLeftMouseButton() && event->flags() & ui::EF_IS_DOUBLE_CLICK) {
click_component_ = HTNOWHERE;
if (target->GetProperty(aura::client::kCanMaximizeKey) &&
previous_click_component == HTCAPTION) {
// Our event is a double click in the caption area in a window that can be
// maximized. We are responsible for dispatching this as a minimize/
// maximize on X11 (Windows converts this to min/max events for us).
ToggleMaximizedState();
event->SetHandled();
return;
}
}
// Get the |x_root_window_| location out of the native event.
if (event->IsLeftMouseButton() && event->native_event()) {
const gfx::Point x_root_location =
ui::EventSystemLocationFromNative(event->native_event());
if (DispatchHostWindowDragMovement(HTCAPTION, x_root_location))
event->StopPropagation();
}
}
void X11WindowEventFilter::OnClickedMaximizeButton(ui::MouseEvent* event) {
aura::Window* target = static_cast<aura::Window*>(event->target());
views::Widget* widget = views::Widget::GetWidgetForNativeView(target);
if (!widget)
return;
gfx::Rect display_work_area =
gfx::Screen::GetScreen()->GetDisplayNearestWindow(target).work_area();
gfx::Rect bounds = widget->GetWindowBoundsInScreen();
if (event->IsMiddleMouseButton()) {
bounds.set_y(display_work_area.y());
bounds.set_height(display_work_area.height());
widget->SetBounds(bounds);
event->StopPropagation();
} else if (event->IsRightMouseButton()) {
bounds.set_x(display_work_area.x());
bounds.set_width(display_work_area.width());
widget->SetBounds(bounds);
event->StopPropagation();
}
}
void X11WindowEventFilter::ToggleMaximizedState() {
if (window_tree_host_->IsMaximized())
window_tree_host_->Restore();
else
window_tree_host_->Maximize();
}
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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