问题描述：
想在.net下实现对一些非规则窗体，没有caption，formborderstyle = system.windows.forms.formborderstyle.none;窗体的拖拽，最小化，最大化，特殊操作的实现(如图1所示)。在黄色的区域即区域1里实现对窗体的拖拽操作，在橙色区域即区域2里实现对窗体的最小化操作，在蓝色区域即区域3里实现对窗体的关闭操作，在绿色区域即区域4里实现对窗体的特殊操作(如双倍窗体)。
(图1)
问题实现：
第一种方法：添加label为label添加click事件。(如图2所示) 如果要用这种方法实现，就要为每一个颜色区域进行切图，并要保证有正确的切图长和宽，然后设置label的背景为这个图片。
(图2)
处理他们的click事件，拖拽处理mousedown mouseup事件。
第二种方法：不添加label只处理鼠标事件，判断鼠标的位置然后决定执行什么操作，这种方法很耗费资源，每次鼠标点击就要判断，鼠标是否在某个区域然后决定是否要处理。不过这个处理用多态包装了。程序看起来比较整齐。
//定义常量
private point point;
private const int dragmove=172;
private const int dragmin=72;
private const int dragclose=72;
private const int dragdouble=78;
private const int dragheight=29;
private mousehandleenum dragenum;
//定义mousedown事件
private void dragmain_mousedown(object sender, system.windows.forms.mouseeventargs e)
{
point.x=e.x;
point.y=e.y;
if(e.y<dragheight)
{
if(e.x<dragmove)
{
dragenum = mousehandleenum.move;
return;
}
if(e.x<dragmove+dragmin)
{
dragenum = mousehandleenum.min;
return;
}
if(e.x<dragmove+dragmin+dragclose)
{
dragenum = mousehandleenum.close;
return;
}
if(e.x<dragmove+dragmin+dragclose+dragdouble)
{
dragenum = mousehandleenum.double;
return;
}
}
}
//定义mouseup事件
private void dragmain_mouseup(object sender, system.windows.forms.mouseeventargs e)
{
point.x=e.x-point.x;
point.y=e.y-point.y;
idragmouse idragmouse;
switch(dragenum)
{
case mousehandleenum.move :
idragmouse = new mousemove(point,this);
break;
case mousehandleenum.min :
idragmouse = new mousemin(point,this);
break;
case mousehandleenum.close :
idragmouse = new mouseclose(point,this);
break;
case mousehandleenum.double :
idragmouse = new mousedouble(point,this);
break;
default:
idragmouse = null;
break;
}
if(idragmouse!=null)
idragmouse.mousedo();
}
}
//定义基类
namespace dragmouse
{
public enum mousehandleenum
{
none=0,
move=1,
min=2,
close=3,
double=4,
}
public class dragmousebase
{
protected point point;
public form form;
public dragmousebase(point point, form form)
{
this.point = point;
this.form = form;
}
}
}
//定义接口
namespace dragmouse
{
/// <summary>
///
/// </summary>
public interface idragmouse
{
void mousedo();
}
}
//拖拽操作
namespace dragmouse
{
/// <summary>
///
/// </summary>
public class mouseclose : dragmousebase,idragmouse
{
public mouseclose(point point,form form):base(point,form)
{
//
// todo: add constructor logic here
//
}
#region idragmouse members
public void mousedo()
{
application.exit();
// todo: add mouseclose.mousedo implementation
}
#endregion
}
}
//其他操作类似。
第三种方法：是用责任链这个设计模式来包装鼠标的点击操作，把操作分配到各个责任链的节点上，是程序更加面向对象，有更好的扩展性。
//两个鼠标事件
private void dragmain_mousedown(object sender, system.windows.forms.mouseeventargs e)
{
request.getinformation(e.x,e.y);
}
private void dragmain_mouseup(object sender, system.windows.forms.mouseeventargs e)
{
request.setscreenpoint(e.x,e.y);
}
//封装的请求类
public class request
{
public int iscreenx;
public int iscreeny;
public int ex;
public int ey;
public readonly int yhigh;
public readonly int draglength;
public readonly int minlength;
public readonly int closelength;
public readonly int doublelength;
private draghandler draghandler;
private minhandler minhandler;
private closehandler closehandler;
private doublehandler doublehandler;
public form parentform;
public void setscreenpoint(int ix,int iy)
{
iscreenx = ix;
iscreeny = iy;
draghandler.handlerequest(this);
}
public void getinformation(int ex,int ey)
{
ex=ex;
ey=ey;
}
public request(int yhigh,int draglength,form form)
{
yhigh = yhigh;
draglength = draglength;
parentform = form;
draghandler = new draghandler();
minhandler =new minhandler();
closehandler = new closehandler();
doublehandler = new doublehandler();
draghandler.setsuccessor(minhandler);
minhandler.setsuccessor(closehandler);
closehandler.setsuccessor(doublehandler);
}
public request(int yhigh,int draglength,int minlength,form form):this(yhigh,draglength,form)
{
minlength = minlength;
}
public request(int yhigh,int draglength,int minlength,int closelength,form form):this(yhigh,draglength,minlength,form)
{
closelength = closelength;
}
public request(int yhigh,int draglength,int minlength,int closelength, int doublelength , form form):this(yhigh,draglength,minlength,closelength,form)
{
doublelength = doublelength;
}
}
//拖拽操作
public class draghandler : handler
{
override public void handlerequest(request request)
{
// determine if we can handle the request
if ((request.ey<request.yhigh)&&(request.ex<request.draglength)) // some complex decision making!
{
request.parentform.left += request.iscreenx-request.ex;
request.parentform.top += request.iscreeny-request.ey;
// request handling code goes here
}
else
{
// not handled here - pass on to next in the chain
if (successorhandler != null)
successorhandler.handlerequest(request);
}
}
}
//其他操作类似
第四种方法：（只是有想法还没有找到成功的实现办法）
在mfc中可以用postmessage或者sendmessag发消息，当鼠标单击，但不在窗体的captiontitle上时，发一个消息告诉系统鼠标在captiontitle（每个窗口自己titlebar）上，这样窗口的拖拽就可以由系统托管了。现在实现了在窗口中任意位置单击鼠标拖拽窗体。但是没有实现上面要求的那些多样化操作。
if(point.y<this->m_height)
{
//发消息给系统伪装鼠标在caption bar 上。
if(point.x<this->m_drag)
{
postmessage(wm_nclbuttondown,
htcaption,
makelparam(point.x,point.y));
return;
}
if(point.x<this->m_drag+this->m_min&&point.x>this->m_drag)
{
postmessage(wm_nclbuttondown,
htminbutton,
makelparam(point.x,point.y));
return;
}
if(point.x<this->m_drag+this->m_min+this->m_close&&point.x>this->m_drag+this->m_min)
{
postmessage(wm_nclbuttondown,
htclose,
makelparam(point.x,point.y));
return;
}
if(point.x<this->m_drag+this->m_min+this->m_close+this->m_double&&point.x>this->m_drag+this->m_min+this->m_close)
{
crgn *rgn = new crgn();
crect *rect =new crect();
this->getwindowrect(*rect);
this->setwindowrgn(*rgn,true);
return;
}
}
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