text: // 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/aura/window_tree_host_win.h"
  
  #include <windows.h>
  
  #include <algorithm>
  
  #include "base/message_loop/message_loop.h"
  #include "ui/aura/client/cursor_client.h"
  #include "ui/aura/window_event_dispatcher.h"
  #include "ui/base/cursor/cursor_loader_win.h"
  #include "ui/base/view_prop.h"
  #include "ui/compositor/compositor.h"
  #include "ui/events/event.h"
  #include "ui/gfx/display.h"
  #include "ui/gfx/insets.h"
  #include "ui/gfx/screen.h"
  
  using std::max;
  using std::min;
  
  namespace aura {
  namespace {
  
  bool use_popup_as_root_window_for_test = false;
  
  }  // namespace
  
  // static
  WindowTreeHost* WindowTreeHost::Create(const gfx::Rect& bounds) {
    return new WindowTreeHostWin(bounds);
  }
  
  // static
  gfx::Size WindowTreeHost::GetNativeScreenSize() {
    return gfx::Size(GetSystemMetrics(SM_CXSCREEN),
                     GetSystemMetrics(SM_CYSCREEN));
  }
  
  WindowTreeHostWin::WindowTreeHostWin(const gfx::Rect& bounds)
      : fullscreen_(false),
        has_capture_(false),
        saved_window_style_(0),
        saved_window_ex_style_(0) {
    if (use_popup_as_root_window_for_test)
      set_window_style(WS_POPUP);
    Init(NULL, bounds);
    SetWindowText(hwnd(), L"aura::RootWindow!");
    CreateCompositor(GetAcceleratedWidget());
  }
  
  WindowTreeHostWin::~WindowTreeHostWin() {
    DestroyCompositor();
    DestroyDispatcher();
    DestroyWindow(hwnd());
  }
  
  gfx::AcceleratedWidget WindowTreeHostWin::GetAcceleratedWidget() {
    return hwnd();
  }
  
  void WindowTreeHostWin::Show() {
    ShowWindow(hwnd(), SW_SHOWNORMAL);
  }
  
  void WindowTreeHostWin::Hide() {
    NOTIMPLEMENTED();
  }
  
  void WindowTreeHostWin::ToggleFullScreen() {
    gfx::Rect target_rect;
    if (!fullscreen_) {
      fullscreen_ = true;
      saved_window_style_ = GetWindowLong(hwnd(), GWL_STYLE);
      saved_window_ex_style_ = GetWindowLong(hwnd(), GWL_EXSTYLE);
      GetWindowRect(hwnd(), &saved_window_rect_);
      SetWindowLong(hwnd(), GWL_STYLE,
                    saved_window_style_ & ~(WS_CAPTION | WS_THICKFRAME));
      SetWindowLong(hwnd(), GWL_EXSTYLE,
                    saved_window_ex_style_ & ~(WS_EX_DLGMODALFRAME |
                        WS_EX_WINDOWEDGE | WS_EX_CLIENTEDGE | WS_EX_STATICEDGE));
  
      MONITORINFO mi;
      mi.cbSize = sizeof(mi);
      GetMonitorInfo(MonitorFromWindow(hwnd(), MONITOR_DEFAULTTONEAREST), &mi);
      target_rect = gfx::Rect(mi.rcMonitor);
    } else {
      fullscreen_ = false;
      SetWindowLong(hwnd(), GWL_STYLE, saved_window_style_);
      SetWindowLong(hwnd(), GWL_EXSTYLE, saved_window_ex_style_);
      target_rect = gfx::Rect(saved_window_rect_);
    }
    SetWindowPos(hwnd(),
                 NULL,
                 target_rect.x(),
                 target_rect.y(),
                 target_rect.width(),
                 target_rect.height(),
                 SWP_NOZORDER | SWP_NOACTIVATE | SWP_FRAMECHANGED);
  }
  
  gfx::Rect WindowTreeHostWin::GetBounds() const {
    RECT r;
    GetClientRect(hwnd(), &r);
    return gfx::Rect(r);
  }
  
  void WindowTreeHostWin::SetBounds(const gfx::Rect& bounds) {
    if (fullscreen_) {
      saved_window_rect_.right = saved_window_rect_.left + bounds.width();
      saved_window_rect_.bottom = saved_window_rect_.top + bounds.height();
      return;
    }
    RECT window_rect;
    window_rect.left = bounds.x();
    window_rect.top = bounds.y();
    window_rect.right = bounds.right() ;
    window_rect.bottom = bounds.bottom();
    AdjustWindowRectEx(&window_rect,
                       GetWindowLong(hwnd(), GWL_STYLE),
                       FALSE,
                       GetWindowLong(hwnd(), GWL_EXSTYLE));
    SetWindowPos(
        hwnd(),
        NULL,
        window_rect.left,
        window_rect.top,
        window_rect.right - window_rect.left,
        window_rect.bottom - window_rect.top,
        SWP_NOMOVE | SWP_NOOWNERZORDER | SWP_NOREDRAW | SWP_NOREPOSITION);
  
    // Explicity call OnHostResized when the scale has changed because
    // the window size may not have changed.
    float current_scale = compositor()->device_scale_factor();
    float new_scale = gfx::Screen::GetScreenFor(window())->
        GetDisplayNearestWindow(window()).device_scale_factor();
    if (current_scale != new_scale)
      OnHostResized(bounds.size());
  }
  
  gfx::Insets WindowTreeHostWin::GetInsets() const {
    return gfx::Insets();
  }
  
  void WindowTreeHostWin::SetInsets(const gfx::Insets& insets) {
  }
  
  gfx::Point WindowTreeHostWin::GetLocationOnNativeScreen() const {
    RECT r;
    GetClientRect(hwnd(), &r);
    return gfx::Point(r.left, r.top);
  }
  
  
  void WindowTreeHostWin::SetCapture() {
    if (!has_capture_) {
      has_capture_ = true;
      ::SetCapture(hwnd());
    }
  }
  
  void WindowTreeHostWin::ReleaseCapture() {
    if (has_capture_) {
      has_capture_ = false;
      ::ReleaseCapture();
    }
  }
  
  bool WindowTreeHostWin::QueryMouseLocation(gfx::Point* location_return) {
    client::CursorClient* cursor_client = client::GetCursorClient(window());
    if (cursor_client && !cursor_client->IsMouseEventsEnabled()) {
      *location_return = gfx::Point(0, 0);
      return false;
    }
  
    POINT pt;
    GetCursorPos(&pt);
    ScreenToClient(hwnd(), &pt);
    const gfx::Size size = GetBounds().size();
    *location_return =
        gfx::Point(max(0, min(size.width(), static_cast<int>(pt.x))),
                   max(0, min(size.height(), static_cast<int>(pt.y))));
    return (pt.x >= 0 && static_cast<int>(pt.x) < size.width() &&
            pt.y >= 0 && static_cast<int>(pt.y) < size.height());
  }
  
  bool WindowTreeHostWin::ConfineCursorToRootWindow() {
    RECT window_rect;
    GetWindowRect(hwnd(), &window_rect);
    return ClipCursor(&window_rect) != 0;
  }
  
  void WindowTreeHostWin::UnConfineCursor() {
    ClipCursor(NULL);
  }
  
  void WindowTreeHostWin::SetCursorNative(gfx::NativeCursor native_cursor) {
    // Custom web cursors are handled directly.
    if (native_cursor == ui::kCursorCustom)
      return;
  
    ui::CursorLoaderWin cursor_loader;
    cursor_loader.SetPlatformCursor(&native_cursor);
    ::SetCursor(native_cursor.platform());
  }
  
  void WindowTreeHostWin::MoveCursorToNative(const gfx::Point& location) {
    // Deliberately not implemented.
  }
  
  void WindowTreeHostWin::OnCursorVisibilityChangedNative(bool show) {
    NOTIMPLEMENTED();
  }
  
  void WindowTreeHostWin::PostNativeEvent(const base::NativeEvent& native_event) {
    ::PostMessage(
        hwnd(), native_event.message, native_event.wParam, native_event.lParam);
  }
  
  void WindowTreeHostWin::OnDeviceScaleFactorChanged(
      float device_scale_factor) {
    NOTIMPLEMENTED();
  }
  
  void WindowTreeHostWin::PrepareForShutdown() {
    NOTIMPLEMENTED();
  }
  
  ui::EventProcessor* WindowTreeHostWin::GetEventProcessor() {
    return dispatcher();
  }
  
  void WindowTreeHostWin::OnClose() {
    // TODO: this obviously shouldn't be here.
    base::MessageLoopForUI::current()->Quit();
  }
  
  LRESULT WindowTreeHostWin::OnKeyEvent(UINT message,
                                        WPARAM w_param,
                                        LPARAM l_param) {
    MSG msg = { hwnd(), message, w_param, l_param };
    ui::KeyEvent keyev(msg, message == WM_CHAR);
    ui::EventDispatchDetails details = SendEventToProcessor(&keyev);
    SetMsgHandled(keyev.handled() || details.dispatcher_destroyed);
    return 0;
  }
  
  LRESULT WindowTreeHostWin::OnMouseRange(UINT message,
                                          WPARAM w_param,
                                          LPARAM l_param) {
    MSG msg = { hwnd(), message, w_param, l_param, 0,
                { CR_GET_X_LPARAM(l_param), CR_GET_Y_LPARAM(l_param) } };
    ui::MouseEvent event(msg);
    bool handled = false;
    if (!(event.flags() & ui::EF_IS_NON_CLIENT)) {
      ui::EventDispatchDetails details = SendEventToProcessor(&event);
      handled = event.handled() || details.dispatcher_destroyed;
    }
    SetMsgHandled(handled);
    return 0;
  }
  
  LRESULT WindowTreeHostWin::OnCaptureChanged(UINT message,
                                              WPARAM w_param,
                                              LPARAM l_param) {
    if (has_capture_) {
      has_capture_ = false;
      OnHostLostWindowCapture();
    }
    return 0;
  }
  
  LRESULT WindowTreeHostWin::OnNCActivate(UINT message,
                                          WPARAM w_param,
                                          LPARAM l_param) {
    if (!!w_param)
      OnHostActivated();
    return DefWindowProc(hwnd(), message, w_param, l_param);
  }
  
  void WindowTreeHostWin::OnMove(const gfx::Point& point) {
    OnHostMoved(point);
  }
  
  void WindowTreeHostWin::OnPaint(HDC dc) {
    gfx::Rect damage_rect;
    RECT update_rect = {0};
    if (GetUpdateRect(hwnd(), &update_rect, FALSE))
      damage_rect = gfx::Rect(update_rect);
    compositor()->ScheduleRedrawRect(damage_rect);
    ValidateRect(hwnd(), NULL);
  }
  
  void WindowTreeHostWin::OnSize(UINT param, const gfx::Size& size) {
    // Minimizing resizes the window to 0x0 which causes our layout to go all
    // screwy, so we just ignore it.
    if (dispatcher() && param != SIZE_MINIMIZED)
      OnHostResized(size);
  }
  
  namespace test {
  
  // static
  void SetUsePopupAsRootWindowForTest(bool use) {
    use_popup_as_root_window_for_test = use;
  }
  
  }  // namespace test
  
  }  // namespace aura
  