WPF HwndHost键盘焦点 [英] WPF HwndHost keyboard focus

问题描述

截图中的图表区域是一个HwndHost控件，该控件承载了一个在C ++ / CLI中实现并使用Direct2D绘制的原生Win32窗口（具有自己的注册WNDCLASS）。 HwndHost被托管在一个WPF边框控件中。

我遇到的问题是我无法将键盘焦点设置到托管的Win32窗口。当用户点击图表区域时，我希望焦点转移到托管的Win32窗口。我试着在WM_LBUTTONDOWN上调用SetFocus，但是在应用程序的其余部分中，这会把焦点放在一边。

目前，即使我点击Win32窗口，焦点仍然在在左边的树视图，如果我按上/下光标键，树视图将得到他们，而不是图表窗口。

我如何使托管的Win32窗口接收从用户点击图表区域的键盘输入，直到它点击另一个控件（如树视图或工具栏）？

alt text http://dl.dropbox.com/u/190212/public /wpf_hwndhost.png

编辑：这是窗口主机的C ++ / CLI代码：

 模板< typename T> 
 inline T intPtrToPtr（IntPtr value）
 {
 return reinterpret_cast< T>（static_cast< void *>（value））; 
} 
 
 public ref class ChartWindowHost：public HwndHost，IKeyboardInputSink 
 {
 private：
 ChartWindow * chartWindow; //这是一个C ++类，做实际的工作
 
 protected：
 virtual HandleRef BuildWindowCore（HandleRef parent）覆盖
 {
 chartWindow = new ChartWindow; 
 const HINSTANCE hInstance = intPtrToPtr< HINSTANCE>（Marshal :: GetHINSTANCE（Assembly :: GetExecutingAssembly（） - > GetModules（）[0]））; 
 const HWND parentWindow = intPtrToPtr< HWND>（parent.Handle）; 
 chartWindow-> Create（hInstance，parentWindow）; 
 return HandleRef（this，IntPtr（chartWindow-> GetHandle（）））; 
 
 $ b $ virtual void DestroyWindowCore（HandleRef / * window * /）覆盖
 {
 chartWindow-> Destroy（）; 
删除chartWindow; 
 chartWindow = NULL; 
} 
}; 
  

解决方案

msdn 指出必须覆盖 WndProc（）在HwndHost子类上...

The chart area in the screenshot is a HwndHost control which hosts a native Win32 window (with it's own registered WNDCLASS) implemented in C++/CLI and drawn with Direct2D. The HwndHost is hosted in a WPF Border control.

The problem I have is that I can't set the keyboard focus to the hosted Win32 window. I want the focus to move to the hosted Win32 window when the used clicks on the chart area. I tried calling SetFocus on WM_LBUTTONDOWN, but that screws up the focus in the rest of the application.

Currently, even if I click on the Win32 window, the focus remains on the tree-view on the left, and if I press the up/down cursor keys, the tree-view will get them, not the chart window.

How do I make the hosted Win32 window receive keyboard input from when the user clicks on the chart area, until it clicks on another control (like the tree-view, or the toolbar)?

alt text http://dl.dropbox.com/u/190212/public/wpf_hwndhost.png

EDIT: Here's the C++/CLI code for the window host:

template <typename T>
inline T intPtrToPtr(IntPtr value)
{
    return reinterpret_cast<T>(static_cast<void*>(value));
}

public ref class ChartWindowHost : public HwndHost, IKeyboardInputSink
{
private:
    ChartWindow* chartWindow;  // this is a C++ class doing the actual work

protected: 
    virtual HandleRef BuildWindowCore(HandleRef parent) override
    {
        chartWindow = new ChartWindow;
        const HINSTANCE hInstance = intPtrToPtr<HINSTANCE>(Marshal::GetHINSTANCE(Assembly::GetExecutingAssembly()->GetModules()[0]));
        const HWND parentWindow = intPtrToPtr<HWND>(parent.Handle);
        chartWindow->Create(hInstance, parentWindow);
        return HandleRef(this, IntPtr(chartWindow->GetHandle()));
    }

    virtual void DestroyWindowCore(HandleRef /*window*/) override
    {
        chartWindow->Destroy();
        delete chartWindow;
        chartWindow = NULL;
    }
};

解决方案

Well, msdn says something about having to override WndProc() on the HwndHost subclass...

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