unreal3窗口锁定鼠标开关

GameViewportClient中有个变量控制是否显示硬件鼠标：

var transient bool bDisplayHardwareMouseCursor

也就是系统的光标，一般通过该类中的函数来操纵：

simulated event SetHardwareMouseCursorVisibility(bool bIsVisible)

{

    local Vector2D ViewportSize;

    //If we are going to be turning on the hardware cursor when it was not already on, we will move the cursor to the middle of the screen

    if (bIsVisible && !bDisplayHardwareMouseCursor)

    {

        GetViewportSize(ViewportSize);

        SetMouse(ViewportSize.X/,ViewportSize.Y/);

    }

    bDisplayHardwareMouseCursor = bIsVisible;

    ForceUpdateMouseCursor(TRUE);

}

其中ForceUpdateMouseCursor是native函数，调用到UGameViewportClient::ForceUpdateMouseCursor，

在Windows上的实现类为FWindowsViewport，其成员函数

void FWindowsViewport::UpdateMouseLock( UBOOL bEnforceMouseLockRequestedFlag )

在每个tick中被调用，会对该控制变量进行检测：

    RECT ClipRect;

    UBOOL bIsHardwareCursorVisible = (GEngine && GEngine->GameViewport && GEngine->GameViewport->bDisplayHardwareMouseCursor);

    UBOOL bIsAnyCursorVisible = bIsSystemCursorVisible || bIsHardwareCursorVisible;

    UBOOL bClipRectValid = (::GetClipCursor( &ClipRect ) != );

    UBOOL bHasFocus = HasFocus();

    UBOOL bShouldMouseLock = bEnforceMouseLockRequestedFlag ? bMouseLockRequested : bHasFocus && (IsFullscreen() || !bIsAnyCursorVisible || bMouseLockRequested);

最后在bShouldMouseLock为TRUE时，调用::ClipCursor锁定鼠标。

巴特西

unreal3窗口锁定鼠标开关

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