winapi - Win32 : full-screen and hiding taskbar

Question

我有一个窗口，我 SetWindowPos(window, HWND_TOP, 0, 0, GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN), SWP_FRAMECHANGED);

它覆盖了整个屏幕，好的，但是也需要一段时间(0.5 秒)才能覆盖任务栏。

有没有办法立即跳出任务栏？我发现设置 HWND_TOPMOST 会立即执行此操作，但即使我切换应用程序，它仍然位于所有其他窗口之上 - 这是我不想要的。另外，如果我先隐藏窗口然后显示它，它会以某种方式强制窗口重新绘制并立即覆盖任务栏，但它会闪烁(因为隐藏)。还有别的办法吗？

Answer 1

编辑 2。甚至还有一种更好的全屏方式，即 chromium 方式，来源自此处:

http://src.chromium.org/viewvc/chrome/trunk/src/ui/views/win/fullscreen_handler.cc?revision=HEAD&view=markup

void FullscreenHandler::SetFullscreenImpl(bool fullscreen, bool for_metro) {
  ScopedFullscreenVisibility visibility(hwnd_);

  // Save current window state if not already fullscreen.
  if (!fullscreen_) {
    // Save current window information.  We force the window into restored mode
    // before going fullscreen because Windows doesn't seem to hide the
    // taskbar if the window is in the maximized state.
    saved_window_info_.maximized = !!::IsZoomed(hwnd_);
    if (saved_window_info_.maximized)
      ::SendMessage(hwnd_, WM_SYSCOMMAND, SC_RESTORE, 0);
    saved_window_info_.style = GetWindowLong(hwnd_, GWL_STYLE);
    saved_window_info_.ex_style = GetWindowLong(hwnd_, GWL_EXSTYLE);
    GetWindowRect(hwnd_, &saved_window_info_.window_rect);
  }

  fullscreen_ = fullscreen;

  if (fullscreen_) {
    // Set new window style and size.
    SetWindowLong(hwnd_, GWL_STYLE,
                  saved_window_info_.style & ~(WS_CAPTION | WS_THICKFRAME));
    SetWindowLong(hwnd_, GWL_EXSTYLE,
                  saved_window_info_.ex_style & ~(WS_EX_DLGMODALFRAME |
                  WS_EX_WINDOWEDGE | WS_EX_CLIENTEDGE | WS_EX_STATICEDGE));

    // On expand, if we're given a window_rect, grow to it, otherwise do
    // not resize.
    if (!for_metro) {
      MONITORINFO monitor_info;
      monitor_info.cbSize = sizeof(monitor_info);
      GetMonitorInfo(MonitorFromWindow(hwnd_, MONITOR_DEFAULTTONEAREST),
                     &monitor_info);
      gfx::Rect window_rect(monitor_info.rcMonitor);
      SetWindowPos(hwnd_, NULL, window_rect.x(), window_rect.y(),
                   window_rect.width(), window_rect.height(),
                   SWP_NOZORDER | SWP_NOACTIVATE | SWP_FRAMECHANGED);
    }
  } else {
    // Reset original window style and size.  The multiple window size/moves
    // here are ugly, but if SetWindowPos() doesn't redraw, the taskbar won't be
    // repainted.  Better-looking methods welcome.
    SetWindowLong(hwnd_, GWL_STYLE, saved_window_info_.style);
    SetWindowLong(hwnd_, GWL_EXSTYLE, saved_window_info_.ex_style);

    if (!for_metro) {
      // On restore, resize to the previous saved rect size.
      gfx::Rect new_rect(saved_window_info_.window_rect);
      SetWindowPos(hwnd_, NULL, new_rect.x(), new_rect.y(),
                   new_rect.width(), new_rect.height(),
                   SWP_NOZORDER | SWP_NOACTIVATE | SWP_FRAMECHANGED);
    }
    if (saved_window_info_.maximized)
      ::SendMessage(hwnd_, WM_SYSCOMMAND, SC_MAXIMIZE, 0);
  }
}

编辑。正如 BrendanMcK 在对此答案的评论中指出的那样，创建一个全屏窗口可能会更好，请参阅此链接:http://blogs.msdn.com/b/oldnewthing/archive/2005/05/05/414910.aspx (“如何用全屏窗口覆盖任务栏？”)

使用上面链接的新代码将是:

HWND CreateFullscreenWindow(HWND hwnd)
{
 HMONITOR hmon = MonitorFromWindow(hwnd,
                                   MONITOR_DEFAULTTONEAREST);
 MONITORINFO mi = { sizeof(mi) };
 if (!GetMonitorInfo(hmon, &mi)) return NULL;
 return CreateWindow(TEXT("static"),
       TEXT("something interesting might go here"),
       WS_POPUP | WS_VISIBLE,
       mi.rcMonitor.left,
       mi.rcMonitor.top,
       mi.rcMonitor.right - mi.rcMonitor.left,
       mi.rcMonitor.bottom - mi.rcMonitor.top,
       hwnd, NULL, g_hinst, 0);
}

<小时/>

下面的旧答案 - 不要使用它，仅保留用于记录如何不这样做。

您必须隐藏任务栏和菜单栏才能立即全屏显示。

代码如下(使用WTL)，调用SetFullScreen(true)进入全屏模式:

template <class T, bool t_bHasSip = true>
class CFullScreenFrame
{
public:
    bool m_fullscreen;
    LONG m_windowstyles;
    WINDOWPLACEMENT m_windowplacement;

    CFullScreenFrame() 
        :
        m_fullscreen(false),
        m_windowstyles(0)
    { }

    void SetFullScreen(bool fullscreen)
    {
        ShowTaskBar(!fullscreen);

        T* pT = static_cast<T*>(this);

        if (fullscreen) {
            if (!m_fullscreen) {
                m_windowstyles = pT->GetWindowLongW(GWL_STYLE);
                pT->GetWindowPlacement(&m_windowplacement);
            }

        }

        // SM_CXSCREEN gives primary monitor, for multiple monitors use SM_CXVIRTUALSCREEN.
        RECT fullrect = { 0 };              
        SetRect(&fullrect, 0, 0, GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN));

        WINDOWPLACEMENT newplacement = m_windowplacement;
        newplacement.showCmd = SW_SHOWNORMAL;
        newplacement.rcNormalPosition = fullrect;

        if (fullscreen) {
            pT->SetWindowPlacement(&newplacement);
            pT->SetWindowLongW(GWL_STYLE,  WS_VISIBLE);
            pT->UpdateWindow();
        } else {
            if (m_fullscreen) {
                pT->SetWindowPlacement(&m_windowplacement);
                pT->SetWindowLongW(GWL_STYLE, m_windowstyles);
                pT->UpdateWindow();
            }
        }

        m_fullscreen = fullscreen;
    }

    void ShowTaskBar(bool show)
    {
        HWND taskbar = FindWindow(_T("Shell_TrayWnd"), NULL);
        HWND start = FindWindow(_T("Button"), NULL);

        if (taskbar != NULL) {
            ShowWindow(taskbar, show ? SW_SHOW : SW_HIDE);
            UpdateWindow(taskbar);
        }
        if (start != NULL) { 
            // Vista
            ShowWindow(start, show ? SW_SHOW : SW_HIDE);
            UpdateWindow(start);
        }       
    }
};

您还必须向 WM_CLOSE 消息添加一些代码:

case WM_CLOSE:
    ShowTaskBar(true);

此解决方案有一个警告，如果您的应用程序崩溃或通过任务管理器终止，则用户将永久丢失系统上的任务栏! (除非他再次运行您的应用程序，进入全屏并退出，然后他将再次看到任务栏)。

之前我在回答中提到了“atlwince.h”，但该函数仅适用于 Windows CE，我上面粘贴的函数适用于 XP、Vista 和 7。