测试界面：
到目前为止，还只是有边框，下面将实现拖拉功能。
首先来实现，当鼠标放在响应区域的时候，根据不同的位置显示不同的箭头样子。
为此先创建一个枚举，用来记录当前鼠标的位置，等拖拉的时候根据该枚举值做不同的计算。
/// <summary>
/// 鼠标在控件中位置
/// </summary>
enum MousePosOnCtrl
{
NONE = 0,
TOP = 1,
RIGHT = 2,
BOTTOM = 3,
LEFT = 4,
TOPLEFT = 5,
TOPRIGHT = 6,
BOTTOMLEFT = 7,
BOTTOMRIGHT = 8,
}
创建一个方法，用来改变光标的样子以及枚举值
/// <summary>
/// 设置光标状态
/// </summary>
public bool SetCursorShape(int x, int y)
{
Point point = new Point(x, y);
if (!ControlRect.Contains(point))
{
Cursor.Current = Cursors.Arrow;
return false;
}
else if (smallRects[0].Contains(point))
{
Cursor.Current = Cursors.SizeNWSE;
mpoc = MousePosOnCtrl.TOPLEFT;
}
else if (smallRects[1].Contains(point))
{
Cursor.Current = Cursors.SizeNESW;
mpoc = MousePosOnCtrl.TOPRIGHT;
}
else if (smallRects[2].Contains(point))
{
Cursor.Current = Cursors.SizeNESW;
mpoc = MousePosOnCtrl.BOTTOMLEFT;
}
else if (smallRects[3].Contains(point))
{
Cursor.Current = Cursors.SizeNWSE;
mpoc = MousePosOnCtrl.BOTTOMRIGHT;
}
else if (sideRects[0].Contains(point))
{
Cursor.Current = Cursors.SizeNS;
mpoc = MousePosOnCtrl.TOP;
}
else if (sideRects[1].Contains(point))
{
Cursor.Current = Cursors.SizeWE;
mpoc = MousePosOnCtrl.LEFT;
}
else if (sideRects[2].Contains(point))
{
Cursor.Current = Cursors.SizeNS;
mpoc = MousePosOnCtrl.BOTTOM;
}
else if (sideRects[3].Contains(point))
{
Cursor.Current = Cursors.SizeWE;
mpoc = MousePosOnCtrl.RIGHT;
}
else
{
Cursor.Current = Cursors.Arrow;
}
return true;
}
接着就是处理相关的三大事件MouseDown、MouseMove、MouseUp来实现拖拉。如同MoveControl都要增加以下两个字段。
private Point pPoint; //上个鼠标坐标
private Point cPoint; //当前鼠标坐标
/// <summary>
/// 鼠标按下事件：记录当前鼠标相对窗体的坐标
/// </summary>
void FrameControl_MouseDown(object sender, MouseEventArgs e)
{
pPoint = Cursor.Position;
}
/// <summary>
/// 鼠标移动事件：让控件跟着鼠标移动
/// </summary>
void FrameControl_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
this.Visible = false;
MoveControl.DrawDragBound(baseControl);
ControlMove();
}
else
{
this.Visible = true;
SetCursorShape(e.X, e.Y); //更新鼠标指针样式
}
}
/// <summary>
/// 鼠标弹起事件：让自定义的边框出现
/// </summary>
void FrameControl_MouseUp(object sender, MouseEventArgs e)
{
this.baseControl.Refresh(); //刷掉黑色边框
this.Visible = true;
CreateBounds();
Draw();
}
