学步园

win32简单的动态创建的图片按钮，加载两幅图片，单击的时候替换。

#pragma once

class ImageButton
{
public:
	ImageButton()
		: m_hwnd(0)
		, m_status(true)
	{
	}

	~ImageButton()
	{
		if (m_hwnd) {
			::DestroyWindow(m_hwnd);
		}
	}

	HWND Create(HWND parent, unsigned int id)
	{
		m_parent = parent;
		m_id = id;
		m_hwnd = ::CreateWindow(_T("BUTTON"), _T(""), WS_CHILD | WS_VISIBLE | BS_BITMAP, 0, 0, 0, 0, parent,
			(HMENU)id, (HINSTANCE)GetWindowLong(parent, GWL_HINSTANCE), NULL);
		return m_hwnd;
	}

	void LoadBitmapFromID(unsigned int id1, unsigned int id2)
	{
		HINSTANCE hInstance = (HINSTANCE)::GetWindowLong(m_parent, GWL_HINSTANCE);
		m_bmp1 = LoadBitmap(hInstance, MAKEINTRESOURCE(id1));
		m_bmp2 = LoadBitmap(hInstance, MAKEINTRESOURCE(id2));
	}

	void Show(RECT rc)
	{
		::ShowWindow(m_hwnd, SW_SHOW);
		::SendMessage(m_hwnd, BM_SETIMAGE, IMAGE_BITMAP, (LPARAM)m_bmp1);
		MoveWindow(m_hwnd, rc.left, rc.top, rc.right-rc.left, rc.bottom-rc.top, TRUE);
	}

	void OnClicked()
	{
		if (m_status) {
			::SendMessage(m_hwnd, BM_SETIMAGE, IMAGE_BITMAP, (LPARAM)m_bmp2);
			m_status = false;
		} else {
			::SendMessage(m_hwnd, BM_SETIMAGE, IMAGE_BITMAP, (LPARAM)m_bmp1);
			m_status = true;
		}
	}

private:
	HWND m_hwnd;
	HWND m_parent;
	unsigned int m_id;
	HBITMAP m_bmp1;
	HBITMAP m_bmp2;
	bool m_status;
};