src/ui/views/widget/desktop_aura/x11_desktop_window_move_client.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/views/widget/desktop_aura/x11_desktop_window_move_client.h"
   6
   7 #include <X11/Xlib.h>
   8
   9 #include "base/debug/stack_trace.h"
  10 #include "base/message_loop/message_loop.h"
  11 #include "base/message_loop/message_pump_x11.h"
  12 #include "base/run_loop.h"
  13 #include "ui/aura/env.h"
  14 #include "ui/aura/window.h"
  15 #include "ui/aura/window_tree_host.h"
  16 #include "ui/base/x/x11_util.h"
  17 #include "ui/events/event.h"
  18 #include "ui/gfx/screen.h"
  19
  20 namespace {
  21
  22 // Delay moving the window.
  23 //
  24 // When we receive a mouse move event, we have to have it processed in a
  25 // different run through the message pump because moving the window will
  26 // otherwise prevent tasks from running.
  27 //
  28 // This constant was derived with playing with builds of chrome; it has no
  29 // theoretical justification.
  30 //
  31 // TODO(erg): This helps with the performance of dragging windows, but it
  32 // doesn't really solve the hard problems, which is that various calls to X11,
  33 // such as XQueryPointer, ui::IsWindowVisible() and ui::WindowContainsPoint()
  34 // take a while to get replies and block in the process. I've seen all of the
  35 // above take as long as 20ms to respond.
  36 const int kMoveDelay = 3;
  37
  38 }  // namespace
  39
  40 namespace views {
  41
  42 X11DesktopWindowMoveClient::X11DesktopWindowMoveClient()
  43     : move_loop_(this),
  44       host_(NULL) {
  45 }
  46
  47 X11DesktopWindowMoveClient::~X11DesktopWindowMoveClient() {}
  48
  49 void X11DesktopWindowMoveClient::OnMouseMovement(XMotionEvent* event) {
  50   gfx::Point cursor_point(event->x_root, event->y_root);
  51   gfx::Point system_loc = cursor_point - window_offset_;
  52
  53   gfx::Rect target_rect(system_loc, host_->GetBounds().size());
  54
  55   window_move_timer_.Start(
  56       FROM_HERE,
  57       base::TimeDelta::FromMilliseconds(kMoveDelay),
  58       base::Bind(&X11DesktopWindowMoveClient::SetHostBounds,
  59                  base::Unretained(this),
  60                  target_rect));
  61 }
  62
  63 void X11DesktopWindowMoveClient::OnMouseReleased() {
  64   EndMoveLoop();
  65 }
  66
  67 void X11DesktopWindowMoveClient::OnMoveLoopEnded() {
  68   host_ = NULL;
  69 }
  70
  71 ////////////////////////////////////////////////////////////////////////////////
  72 // DesktopWindowTreeHostLinux, aura::client::WindowMoveClient implementation:
  73
  74 aura::client::WindowMoveResult X11DesktopWindowMoveClient::RunMoveLoop(
  75     aura::Window* source,
  76     const gfx::Vector2d& drag_offset,
  77     aura::client::WindowMoveSource move_source) {
  78   window_offset_ = drag_offset;
  79   host_ = source->GetHost();
  80
  81   bool success = move_loop_.RunMoveLoop(source, host_->last_cursor());
  82   return success ? aura::client::MOVE_SUCCESSFUL : aura::client::MOVE_CANCELED;
  83 }
  84
  85 void X11DesktopWindowMoveClient::EndMoveLoop() {
  86   window_move_timer_.Stop();
  87   move_loop_.EndMoveLoop();
  88 }
  89
  90 ////////////////////////////////////////////////////////////////////////////////
  91 // DesktopWindowTreeHostLinux, private:
  92
  93 void X11DesktopWindowMoveClient::SetHostBounds(const gfx::Rect& rect) {
  94   host_->SetBounds(rect);
  95 }
  96
  97 }  // namespace views