WS_EX_COMPOSITED的无闪烁选项卡控件 [英] flicker free tab control with WS_EX_COMPOSITED

问题描述

我有一个使用WTL 8.1开发的Windows XP SP3的VS2008 C ++应用程序.我的应用程序包含一个选项卡控件，当调整应用程序边框的大小时，该控件会闪烁.

I have a VS2008 C++ application for Windows XP SP3 developed using WTL 8.1. My application contains a tab control that flickers when the application border is resized.

我的窗口层次结构如下:

My window hierarchy looks like this:

CFrameWindowImpl   CMainFrm
|-CSplitterWindow  Splitter
  |-CTabView       Configuration Tabs
  | |-CDialogImpl  Configuration View 1
  | |-CDialogImpl  Configuration View 2
  | |-CDialogImpl  Configuration View 3
  |-CDialogImpl    Control View

我正在尝试的解决方案是使CFrameWindowImpl派生类使用WS_EX_COMPOSITED样式，并且其下面的所有窗口都使用WS_EX_TRANSPARENT样式.不幸的是，这使得选项卡控件按钮显示为空白的黑条，而所有配置视图"的控件都根本不显示.

The solution I'm trying is to make the CFrameWindowImpl derived class use the WS_EX_COMPOSITED style and all windows beneath it use the WS_EX_TRANSPARENT style. Unfortunately, this makes the tab control buttons show as an empty black bar and the controls of any Configuration View to not show at all.

如果我删除了WS_EX_COMPOSITED和WS_EX_TRANSPARENT样式，则窗体会正确显示，但是CTabView及其下面的所有内容在调整大小时都会闪烁.

If I remove the WS_EX_COMPOSITED and WS_EX_TRANSPARENT styles, the form displays properly, but the CTabView and everything beneath it flickers horribly when resized.

我需要更改什么以消除闪烁并正确绘制控件?

What do I need to change to eliminate the flicker and draw the controls properly?

谢谢， PaulH

得到它的工作.我按照Mark Ransom的建议删除了所有WS_EX_TRANSPARENT样式.我将WS_EX_COMPOSITED样式仅放在CTabCtrl(包含在CTabView中)上.其他控件根据需要通过WTL::CDoubleBufferImpl<>获得双缓冲.

Got it working. I removed all the WS_EX_TRANSPARENT styles per Mark Ransom's suggestion. I put the WS_EX_COMPOSITED style on only the CTabCtrl (contained within the CTabView). Other controls get double-buffering as needed through WTL::CDoubleBufferImpl<>.

推荐答案

一个窗口闪烁，因为它在绘制之前已被擦除.为了消除这种情况，您需要完全禁用对窗口的擦除，并使用双重缓冲-将窗口内容绘制到位图中，然后将位图复制到窗口中.因为位图包含了包括背景在内的全部内容，所以不再需要擦除.

A window flickers because it gets erased before it's drawn. To eliminate this you need to disable erasing of the window entirely and use double buffering - draw the window contents into a bitmap, then copy the bitmap to the window. Because the bitmap contains the entire contents including the background, there's no need to erase anymore.

看起来WS_EX_COMPOSITED将自动处理双缓冲，但是您可能仍需要使用NULL背景画笔和/或处理WM_ERASEBKGND消息.

It looks like WS_EX_COMPOSITED will handle the double buffering automatically, but you still probably need to use a NULL background brush and/or handle the WM_ERASEBKGND message.

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