BOOL CMainFrame::OnQueryNewPalette() { // always realize the palette for the active view CMDIChildWnd* pMDIChildWnd = MDIGetActive(); if (pMDIChildWnd == NULL) return (FALSE); // no active MDI child frame (no new palette) CView* pView = pMDIChildWnd->GetActiveView(); ASSERT(pView != NULL); // just notify the target view pView->SendMessage(WM_QUERYNEWPALETTE); return (TRUE); }

这段代码是在应用程序的主窗口类 `CMainFrame` 中的 `OnQueryNewPalette` 函数中执行的。让我逐行解释：

- `CMDIChildWnd* pMDIChildWnd = MDIGetActive();`：获取当前活动的 MDI 子窗口。

- `if (pMDIChildWnd == NULL) return (FALSE);`：如果没有活动的 MDI 子窗口，则返回 `FALSE`，表示没有新的调色板。

- `CView* pView = pMDIChildWnd->GetActiveView();`：获取当前活动的子窗口的视图对象。

- `ASSERT(pView != NULL);`：确保获取到有效的视图对象。

- `pView->SendMessage(WM_QUERYNEWPALETTE);`：向目标视图发送 `WM_QUERYNEWPALETTE` 消息，以便通知它有新的调色板。

- `return (TRUE);`：返回 `TRUE`，表示有新的调色板。

这段代码的作用是在查询是否有新的调色板时，始终实现当前活动视图的调色板。它通过向当前活动视图发送 `WM_QUERYNEWPALETTE` 消息来通知它有新的调色板。这样做可以确保在调色板发生改变时，当前活动视图能够适应并进行相应的调色板处理。

相关问题

CompileCommand: exclude com/intellij/openapi/vfs/impl/FilePartNodeRoot.trieDescend bool exclude = true

I'm sorry, but as an AI language model, I am not able to compile code or provide specific programming solutions. However, I can provide some general guidance on the topic.

The "CompileCommand" you mentioned seems to be related to excluding a specific class or method from compilation in the IntelliJ IDEA IDE.

In this case, "com/intellij/openapi/vfs/impl/FilePartNodeRoot.trieDescend" is the fully qualified name of the class and "exclude = true" indicates that this class should be excluded from the compilation.

To exclude a class or method from compilation in IntelliJ IDEA, you can use the "Excluded" option in the module settings. Here are the steps to follow:

1. Open the module settings by clicking on "File" > "Project Structure".
2. Select the module for which you want to exclude the class or method.
3. Click on the "Sources" tab.
4. Under the "Excluded" section, click on the "+" button to add a new exclusion.
5. Enter the fully qualified name of the class or method you want to exclude.
6. Click "OK" to save the exclusion.

Note that excluding a class or method from compilation may cause errors in other parts of your code, so use this option carefully and only when necessary.

using click = std::function<void(void*，bool)>;的作用

这是一个C++11中的类型别名，它将一个函数类型`std::function<void(void*, bool)>`定义为一个新的名称click。

这个函数类型的定义表示它是一个可以接受一个`void*`类型和一个`bool`类型的参数，返回值为空的函数。这个类型别名可以方便地用于定义函数指针或函数对象。

例如，我们可以这样定义一个函数对象myClick，它符合click的函数类型：

struct myClick
{
    void operator()(void* arg, bool flag) const
    {
        // do something with arg and flag
    }
};

然后我们可以使用myClick对象作为click类型的参数传递给另一个函数：

void doSomething(click func)
{
    void* arg = ...;
    bool flag = ...;
    func(arg, flag);
}

int main()
{
    myClick c;
    doSomething(c); // call c.operator()(arg, flag)
    return 0;
}

这样就可以方便地实现带有额外标志位的回调函数等功能。