MFC中利用CDockablePane实现悬浮窗

Camera.h

#pragma once
#include "afxdialogex.h"
// Camera 对话框
class Camera : public CDialogEx
{
	DECLARE_DYNAMIC(Camera)
public:
	Camera(CWnd* pParent = nullptr);   // 标准构造函数
	virtual ~Camera();
// 对话框数据
#ifdef AFX_DESIGN_TIME
	enum { IDD = IDD_CAMERA };
#endif
protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV 支持
	DECLARE_MESSAGE_MAP()
public:
	afx_msg void OnBnClickedButton1();
};
class CCameraPane : public CDockablePane
{
public:
	CCameraPane();
	virtual ~CCameraPane();
private:
	Camera m_Camera;
protected:
	afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);
	afx_msg void OnSize(UINT nType, int cx, int cy);
	afx_msg void OnDestroy();

	DECLARE_MESSAGE_MAP()
};
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Camera.cpp

// Camera.cpp: 实现文件
//
#include "pch.h"
#include "afxdialogex.h"
#include "Camera.h"
// Camera 对话框
IMPLEMENT_DYNAMIC(Camera, CDialogEx)
// 对话框数据
#ifdef AFX_DESIGN_TIME
enum { IDD = IDD_CAMERA };
#endif
Camera::Camera(CWnd* pParent /*=nullptr*/)
	: CDialogEx(IDD_CAMERA, pParent)
{
}
Camera::~Camera()
{
}
void Camera::DoDataExchange(CDataExchange* pDX)
{
	CDialogEx::DoDataExchange(pDX);
}
BEGIN_MESSAGE_MAP(Camera, CDialogEx)
	ON_BN_CLICKED(IDC_BUTTON1, &Camera::OnBnClickedButton1)
END_MESSAGE_MAP()
// Camera 消息处理程序
void Camera::OnBnClickedButton1()
{
	// TODO: 在此添加控件通知处理程序代码
}
CCameraPane::CCameraPane()
{
}
CCameraPane::~CCameraPane()
{
}
void CCameraPane::OnDestroy()
{
	CDockablePane::OnDestroy();
	m_Camera.DestroyWindow();
}
/// <summary>
/// 子窗体悬浮
/// </summary>
/// <param name="lpCreateStruct"></param>
/// <returns></returns>
int CCameraPane::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
	if (CDockablePane::OnCreate(lpCreateStruct) == -1)
		return -1;

	// TODO:  Add your specialized creation code here 
	if (!m_Camera.Create(IDD_CAMERA, this))
	{
		TRACE0("未能创建窗口/n");
		return -1;
	}
	m_Camera.ShowWindow(SW_SHOW);
	return 0;
}
/// <summary>
/// 消除窗体残影
/// </summary>
/// <param name="nType"></param>
/// <param name="cx"></param>
/// <param name="cy"></param>
void CCameraPane::OnSize(UINT nType, int cx, int cy)
{
	CDockablePane::OnSize(nType, cx, cy);
	if (m_Camera.GetSafeHwnd())
	{
		CRect rect;
		GetClientRect(rect);
		m_Camera.MoveWindow(rect);
	}
}
BEGIN_MESSAGE_MAP(CCameraPane, CDockablePane)
	ON_WM_CREATE()
	ON_WM_SIZE()
END_MESSAGE_MAP()
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MainFrm.h

    CCameraPane		  m_wndCameraPane;
1

MainFrm.cpp

	// 创建测试对话框
	if (!m_wndCameraPane.Create(_T("测试"), this, CRect(0, 0, 200, 200), TRUE, IDD_CAMERA, WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN | CBRS_LEFT | CBRS_FLOAT_MULTI))
	{
		TRACE0("未能创建窗口\n");
		return FALSE; // 未能创建
	}
	m_wndCameraPane.EnableDocking(CBRS_ALIGN_ANY);
	DockPane(&m_wndCameraPane);
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