Shulou(Shulou.com)06/02 Report--

This article mainly explains "how to create a control with a mouse frame in C#". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Next let the editor to take you to learn "C# how to use the mouse frame to create controls" it!

First of all, Control _ Owner is defined, and the Control type is used because we not only need to add controls to Winform, but also add containers to other containers, such as Panel,GroupBox, Panel,GroupBox, etc.

Then restart the mouse event Control_MouseDown,Control_MouseMove,Control_MouseUp,Control_MouseEnter on the Control.

Directly on the source code

Using System

Using System.Drawing

Using System.Drawing.Drawing2D

Using System.Windows.Forms

Namespace SumBLL.DrawControl

{

# region mouse drag to create a control

/ / /

/ / Mouse drag to create event

/ / /

Public class MouseHook

{

Control _ Owner

/ / Child controls to be drawn

Private Control _ childCtrl

Private bool _ autosize

Private int _ CLickAtX

Private int _ ClickAtY

Private int _ MoveAtX

Private int _ MoveAtY

Private bool _ BeginDrag

Private bool _ BeginDrawControl

/ / /

/ / external public class

/ / /

Public Control DrawCtrl

{

Get

{

Return _ childCtrl

}

Set

{

_ childCtrl = value

}

}

/ / /

/ / Owner uses the Control type here because we not only need to add controls to the Winform

/ you also need to add containers to other containers, such as Panel,GroupBox.

/ / /

/ / /

Public MouseHook (Control Owner, bool autosize = true)

{

This._Owner = Owner

This._Owner.MouseDown + = new MouseEventHandler (this.Control_MouseDown)

This._Owner.MouseMove + = new MouseEventHandler (this.Control_MouseMove)

This._Owner.MouseUp + = new MouseEventHandler (this.Control_MouseUp)

This._Owner.MouseEnter + = new EventHandler (this.Control_MouseEnter)

This._BeginDrawControl = false

This._autosize = autosize

}

# Mouse events on region Control

Void Control_MouseDown (object sender, MouseEventArgs e)

{

/ / decide whether to select a control or a brush

If (_ childCtrl! = null)

{

This._CLickAtX = e.x

This._ClickAtY = e.Y

This._MoveAtX = e.x

This._MoveAtY = e.Y

This._BeginDrag = true

If (_ childCtrl! = null)

{

This._BeginDrawControl = true

}

Else

{

This._BeginDrawControl = false

}

}

}

Void Control_MouseMove (object sender, MouseEventArgs e)

{

If (_ childCtrl! = null)

{

If (this._BeginDrag)

{

/ / cancel the selection box drawn last time

Int iLeft, iTop, iWidth, iHeight

Pen pen

Rectangle rect

Pen = new Pen (this._Owner.BackColor)

If (this._BeginDrawControl = = true)

{

Pen.DashStyle = DashStyle.Solid

Pen.Width = 2

}

Else

{

Pen.DashStyle = DashStyle.Dot

}

ILeft = this._CLickAtX < this._MoveAtX? This._CLickAtX: this._MoveAtX

ITop = this._ClickAtY < this._MoveAtY? This._ClickAtY: this._MoveAtY

IWidth = Math.Abs (this._MoveAtX-this._CLickAtX)

IHeight = Math.Abs (this._MoveAtY-this._ClickAtY)

Rect = new Rectangle (iLeft, iTop, iWidth, iHeight)

This._Owner.CreateGraphics () .DrawRectangle (pen rect)

/ / redraw the selection box

This._MoveAtX = e.x

This._MoveAtY = e.Y

Pen = new Pen (Color.Black)

If (this._BeginDrawControl = = true)

{

Pen.DashStyle = DashStyle.Solid

Pen.Width = 2

}

Else

{

Pen.DashStyle = DashStyle.Dot

}

ILeft = this._CLickAtX < this._MoveAtX? This._CLickAtX: this._MoveAtX

ITop = this._ClickAtY < this._MoveAtY? This._ClickAtY: this._MoveAtY

IWidth = Math.Abs (this._MoveAtX-this._CLickAtX)

IHeight = Math.Abs (this._MoveAtY-this._ClickAtY)

Rect = new Rectangle (iLeft, iTop, iWidth, iHeight)

This._Owner.CreateGraphics () .DrawRectangle (pen rect)

}

}

}

Void Control_MouseUp (object sender, MouseEventArgs e)

{

This._BeginDrag = false

This._Owner.SuspendLayout ()

If (_ childCtrl! = null)

{

/ / cancel the selection box drawn last time

Int iLeft, iTop, iWidth, iHeight

Pen pen

Rectangle rect

Pen = new Pen (this._Owner.BackColor)

Pen.DashStyle = DashStyle.Dot

ILeft = this._CLickAtX < this._MoveAtX? This._CLickAtX: this._MoveAtX

ITop = this._ClickAtY < this._MoveAtY? This._ClickAtY: this._MoveAtY

IWidth = Math.Abs (this._MoveAtX-this._CLickAtX)

IHeight = Math.Abs (this._MoveAtY-this._ClickAtY)

Rect = new Rectangle (iLeft, iTop, iWidth, iHeight)

This._Owner.CreateGraphics () .DrawRectangle (pen rect)

If (_ childCtrl! = null)

{

AddControl (_ childCtrl, rect)

}

Else

{

/ / here is to drag the mouse and select the control, which will be given in the following introduction

}

}

This._Owner.Refresh ()

This._Owner.ResumeLayout ()

}

Void Control_MouseEnter (object sender, EventArgs e)

{

If (_ childCtrl! = null)

{

This._Owner.Cursor = Cursors.Cross

}

Else

{

This._Owner.Cursor = Cursors.Default

}

}

Private void AddControl (Control control, Rectangle rect)

{

Try

{

Control.Location = rect.Location

If (! _ autosize)

Control.Size = rect.Size

/ / control.Name = GetControlName (control)

/ / because .text cannot be set to a non-date type for the DataTimePiker control, the error is ignored

Try

{

Control.Text = GetControlType (control)

}

Catch {}

This._Owner.Controls.Add (control)

Control.Visible = true

This._Owner.Cursor = Cursors.Default

_ childCtrl = null

}

Catch (Exception e)

{

This._Owner.Cursor = Cursors.Default

_ childCtrl = null

}

}

Private string GetControlType (Control ctrl)

{

String strType = ctrl.GetType () .ToString ()

String strControlType

String [] strArr = strType.Split ("." .ToCharArray ())

StrControlType = strArr [strArr.Length-1] .trim ()

Return strControlType

}

Private string GetControlName (Control control)

{

/ / the control name is simply returned here. If necessary, you can do special processing by modifying this function.

Return control.GetType () Name

}

# endregion

}

# endregion

}

External calling method

/ / function class for dragging controls, which is directly instantiated when the form is initialized

Private MouseHook _ MouseHook

/ / initialize Panel display dynamic patrol points

This._MouseHook = new MouseHook (pnlRouteDetail)

/ / create a user control instance

UCPatRouteDetail ucrd = new UCPatRouteDetail (_ nowPatRouteDetail)

Ucrd.Name = _ nowPatRouteDetail.RouteID + _ nowPatRouteDetail.DetailID

Ucrd.MouseDown + = MouseDown

Ucrd.MouseMove + = MouseMove

Ucrd.MouseUp + = MouseUp

Ucrd.Delevent + = DelUserControl

/ / assign a new instance to the drawing place

_ MouseHook.DrawCtrl = ucrd

At this point, I believe you have a deeper understanding of "how to create a control with a mouse frame in C#". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.