非模态对话框使用ON_UPDATE_COMMAND_UI_后台非模态框ui-优快云博客

本文链接：https://blog.youkuaiyun.com/pandy1110/article/details/5935239

本文探讨了如何使MFC中的模式对话框能够进行闲置处理。由于模式对话框使用自身的消息循环，不能自动接收WM_KICKIDLE消息启动闲置处理。文章提供了一种解决方案，通过父窗口发送WM_IDLEUPDATECMDUI消息来触发模式对话框的闲置更新。

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ON_UPDATE_COMMAND_UI for Modeless Dialogs

Modeless dialogs can't automatically use the WM_KICKIDLE message to start idle processing. This is because MFC uses it's own model dialog message loop that sends WM_KICKIDLE messages. But modeless dialogs use the standard dialog message loop in Windows. This one doesn't send WM_KICKIDLE messages.

So by taking a look at how MFC allows dialog bars to do idle processing, this is the best I can come up with.

1. Keep a pointer to the modeless dialog in the parent window that created the dialog. Frame or view.
2. In the parent window add a message map for WM_IDLEUPDATECMDUI. This message is pumped out by the app's OnIdle loop.
3. Send WM_IDLEUPDATECMDUI to the modeless dialog from the parent's OnIdleUpdateCmdUI function.
4. Add a message map for WM_IDLEUPDATECMDUI in the dialog and call UpdateDialogControls
5. Use ON_UPDATE_COMMAND_UI message maps as needed.

Notes:
WM_IDLEUPDATECMDUI is defined in afxpriv.h.
You could send the dialog WM_KICKIDLE messages. I just used WM_IDLEUPDATECMDUI to fit in with the way MFC does things.

Legacy CodeGuru | 10/07/1998 12:00am