MFC windows程序设计（第三版）课后习题第七章

7-1 鼠标消息分哪两类,它们之间有什么区别?

答:根据产生鼠标消息时鼠标光标所处的位置,鼠标消息分为:客户区鼠标消息和非客户区鼠标消息两类。
在应用程序窗口中,用户可以绘图的部分叫做客户区或者用户区,而除此之外的区域叫非客户区。
鼠标在客户区产生的消息叫客户区鼠标消息,在非客户区产生的消息叫非客户区鼠标消息。

7-3 在程序设计中,如何使用非客户区鼠标消息?

答:首先,在主框架窗口类的声明中手工添加非客户消息响应函数的声明,然后在主框架窗口类实现文件的消息映射表中添加消息映射,最后在主框架窗口类的实现文件中,添加鼠标响应函数并实现它。

7-9 编写一个

(1)

//添加数据成员
class CM7_9Doc : public CDocument
{

// Attributes
public:
	CPoint p1,p2;
	int flag;
	};

void CM7_9View::OnDraw(CDC* pDC)
{
	CM7_9Doc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	
	CClientDC dc(this);
	p1.x = 300;
	p1.y = 300;
	
	if(flag == 0){
		pDC->Ellipse(pDoc->p2.x+50,pDoc->p2.y+50,pDoc->p2.x-50,pDoc->p2.y-50);
	}
	else{
		pDC->Ellipse(p1.x+50,p1.y+50,p1.x-50,p1.y-50);
	}
}
//单击鼠标左键 圆放大
void CM7_9View::OnLButtonDown(UINT nFlags, CPoint point) 
{
	CClientDC dc(this);
	p1.x = 350;
	p1.y = 350;
	dc.Ellipse(p1.x+100,p1.y+100,p1.x-100,p1.y-100);
	
	CView::OnLButtonDown(nFlags, point);
}
//单击鼠标右键 圆变小
void CM7_9View::OnRButtonDown(UINT nFlags, CPoint point) 
{
	
	InvalidateRect(NULL,TRUE);
	CClientDC dc(this);
	p1.x = 350;
	p1.y = 350;
	dc.Ellipse(p1.x+50,p1.y+50,p1.x-50,p1.y-50);

	CView::OnRButtonDown(nFlags, point);
}

void CM7_9View::OnMouseMove(UINT nFlags, CPoint point) 
{

	CM7_9Doc* pDoc = GetDocument();
	//按下crtl 同时移动鼠标 圆跟着鼠标移动	
	if(nFlags&MK_CONTROL){
		flag = 0;
		pDoc->p2 = point;
		InvalidateRect(NULL,true);
	}

	CView::OnMouseMove(nFlags, point);
}

7-12

class CM7_12Doc : public CDocument
{
public:
	CRect rect;
	};
CM7_12Doc::CM7_12Doc()
{
	rect.left = 200;
	rect.right = 400;
	rect.top = 200;
	rect.bottom =300;
}

void CM7_12View::OnDraw(CDC* pDC)
{
	CM7_12Doc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	CClientDC dc(this);

	dc.Rectangle(pDoc->rect);
	// TODO: add draw code for native data here
}

void CM7_12View::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags) 
{
	// TODO: Add your message handler code here and/or call default
	CM7_12Doc* pDoc = GetDocument();
	CRect client;
	GetClientRect(&client);
	switch(nChar){
	case VK_LEFT:
		pDoc->rect.left -=10;
		pDoc->rect.right -=10;
		break;
	case VK_RIGHT:
		pDoc->rect.left +=10;
		pDoc->rect.right +=10;
		break;
	case VK_UP:
		pDoc->rect.top -=10;
		pDoc->rect.bottom -=10;
		break;
	case VK_DOWN:
		pDoc->rect.top +=10;
		pDoc->rect.bottom +=10;
		break;
	case VK_HOME:
		pDoc->rect.left -=10;
		pDoc->rect.top -=10;
		break;
	case VK_END:
		pDoc->rect.bottom +=10;
		pDoc->rect.right +=10;
		break;

	}
	InvalidateRect(NULL,true);
	CView::OnKeyDown(nChar, nRepCnt, nFlags);
}

void CM7_12View::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	CM7_12Doc *pDoc = GetDocument();
	pDoc->rect.left = 200;
	pDoc->rect.right = 400;
	pDoc->rect.top = 200;
	pDoc->rect.bottom = 300;
	InvalidateRect(NULL,true);

	CView::OnLButtonDown(nFlags, point);
}