Vertical scroll bar code

Source: Internet
Author: User

Code
Using system;
Using system. Collections. Generic;
Using system. componentmodel;
Using system. drawing;
Using system. Data;
Using system. text;
Using system. Windows. forms;
Using system. Windows. Forms. design;
Using system. diagnostics;
Namespace customcontrols {

[Designer (typeof (scrollbarcontroldesigner)]
Public class customscrollbar: usercontrol {

Protected color mochannelcolor = color. empty;
Protected image mouparrowimage = NULL;
// Protected image mouparrowimage_over = NULL;
// Protected image mouparrowimage_down = NULL;
Protected image modownarrowimage = NULL;
// Protected image modownarrowimage_over = NULL;
// Protected image modownarrowimage_down = NULL;
Protected image mothumbarrowimage = NULL;

Protected image mothumbtopimage = NULL;
Protected image mothumbtopspanimage = NULL;
Protected image mothumbbottomimage = NULL;
Protected image mothumbbottomspanimage = NULL;
Protected image mothumbmiddleimage = NULL;

Protected int molargechange = 10;
Protected int mosmallchange = 1;
Protected int mominimum = 0;
Protected int momaximum = 100;
Protected int movalue = 0;
Private int nclickpoint;

Protected int mothumbtop = 0;

Protected bool moautosize = false;

Private bool mothumbdown = false;
Private bool mothumbdragging = false;

Public new event eventhandler scroll = NULL;
Public event eventhandler valuechanged = NULL;

Private int getthumbheight ()
{
Int ntrackheight = (this. Height-(uparrowimage. height + downarrowimage. Height ));
Float fthumbheight = (float) largechange/(float) Maximum) * ntrackheight;
Int nthumbheight = (INT) fthumbheight;

If (nthumbheight> ntrackheight)
{
Nthumbheight = ntrackheight;
Fthumbheight = ntrackheight;
}
If (nthumbheight <56)
{
Nthumbheight = 56;
Fthumbheight = 56;
}

Return nthumbheight;
}

Public customscrollbar (){

Initializecomponent ();
Setstyle (controlstyles. resizeredraw, true );
Setstyle (controlstyles. allpaintinginwmpaint, true );
Setstyle (controlstyles. doublebuffer, true );

Mochannelcolor = color. fromargb (51,166, 3 );
Uparrowimage = resource. uparrow;
Downarrowimage = resource. downarrow;


Thumbbottomimage = resource. thumbbottom;
Thumbbottomspanimage = resource. thumbspanbottom;
Thumbtopimage = resource. thumbtop;
Thumbtopspanimage = resource. thumbspantop;
Thumbmiddleimage = resource. thumbmiddle;

This. width = uparrowimage. width;
Base. minimumsize = new size (uparrowimage. Width, uparrowimage. height + downarrowimage. height + getthumbheight ());
}

[Editorbrowsable (editorbrowsablestate. Always), browsable (true), defaultvalue (false), category ("behavior"), description ("largechange")]
Public int largechange {
Get {return molargechange ;}
Set {molargechange = value;
Invalidate ();
}
}

[Editorbrowsable (editorbrowsablestate. Always), browsable (true), defaultvalue (false), category ("behavior"), description ("smallchange")]
Public int smallchange {
Get {return mosmallchange ;}
Set {mosmallchange = value;
Invalidate ();
}
}

[Editorbrowsable (editorbrowsablestate. Always), browsable (true), defaultvalue (false), category ("behavior"), description ("minimum")]
Public int minimum {
Get {return mominimum ;}
Set {mominimum = value;
Invalidate ();
}
}

[Editorbrowsable (editorbrowsablestate. Always), browsable (true), defaultvalue (false), category ("behavior"), description ("maximum")]
Public int maximum {
Get {return momaximum ;}
Set {momaximum = value;
Invalidate ();
}
}

[Editorbrowsable (editorbrowsablestate. Always), browsable (true), defaultvalue (false), category ("behavior"), description ("value")]
Public int value {
Get {return movalue ;}
Set {movalue = value;

Int ntrackheight = (this. Height-(uparrowimage. height + downarrowimage. Height ));
Float fthumbheight = (float) largechange/(float) Maximum) * ntrackheight;
Int nthumbheight = (INT) fthumbheight;

If (nthumbheight> ntrackheight)
{
Nthumbheight = ntrackheight;
Fthumbheight = ntrackheight;
}
If (nthumbheight <56)
{
Nthumbheight = 56;
Fthumbheight = 56;
}

// Figure out value
Int npixelrange = ntrackheight-nthumbheight;
Int nrealrange = (maximum-minimum)-largechange;
Float fperc = 0.0f;
If (nrealrange! = 0)
{
Fperc = (float) movalue/(float) nrealrange;

}

Float ftop = fperc * npixelrange;
Mothumbtop = (INT) ftop;


Invalidate ();
}
}

[Editorbrowsable (editorbrowsablestate. Always), browsable (true), defaultvalue (false), category ("skin"), description ("channel color")]
Public color channelcolor
{
Get {return mochannelcolor ;}
Set {mochannelcolor = value ;}
}

[Editorbrowsable (editorbrowsablestate. Always), browsable (true), defaultvalue (false), category ("skin"), description ("Up Arrow graphic")]
Public Image uparrowimage {
Get {return mouparrowimage ;}
Set {mouparrowimage = value ;}
}

[Editorbrowsable (editorbrowsablestate. Always), browsable (true), defaultvalue (false), category ("skin"), description ("Up Arrow graphic")]
Public Image downarrowimage {
Get {return modownarrowimage ;}
Set {modownarrowimage = value ;}
}

[Editorbrowsable (editorbrowsablestate. Always), browsable (true), defaultvalue (false), category ("skin"), description ("Up Arrow graphic")]
Public Image thumbtopimage {
Get {return mothumbtopimage ;}
Set {mothumbtopimage = value ;}
}

[Editorbrowsable (editorbrowsablestate. Always), browsable (true), defaultvalue (false), category ("skin"), description ("Up Arrow graphic")]
Public Image thumbtopspanimage {
Get {return mothumbtopspanimage ;}
Set {mothumbtopspanimage = value ;}
}

[Editorbrowsable (editorbrowsablestate. Always), browsable (true), defaultvalue (false), category ("skin"), description ("Up Arrow graphic")]
Public Image thumbbottomimage {
Get {return mothumbbottomimage ;}
Set {mothumbbottomimage = value ;}
}

[Editorbrowsable (editorbrowsablestate. Always), browsable (true), defaultvalue (false), category ("skin"), description ("Up Arrow graphic")]
Public Image thumbbottomspanimage {
Get {return mothumbbottomspanimage ;}
Set {mothumbbottomspanimage = value ;}
}

[Editorbrowsable (editorbrowsablestate. Always), browsable (true), defaultvalue (false), category ("skin"), description ("Up Arrow graphic")]
Public Image thumbmiddleimage {
Get {return mothumbmiddleimage ;}
Set {mothumbmiddleimage = value ;}
}

Protected override void onpaint (painteventargs e ){

E. Graphics. interpolationmode = system. Drawing. drawing2d. interpolationmode. nearestneighbor;

If (uparrowimage! = NULL ){
E. Graphics. drawimage (uparrowimage, new rectangle (new point (0, 0), new size (this. Width, uparrowimage. Height )));
}

Brush obrush = new solidbrush (mochannelcolor );
Brush owhitebrush = new solidbrush (color. fromargb (255,255,255 ));

// Draw channel left and right border colors
E. Graphics. fillrectangle (owhitebrush, new rectangle (0, uparrowimage. Height, 1, (this. Height-DownArrowImage.Height )));
E. Graphics. fillrectangle (owhitebrush, new rectangle (this. Width-1, uparrowimage. Height, 1, (this. Height-downarrowimage. Height )));

// Draw Channel
E. Graphics. fillrectangle (obrush, new rectangle (1, uparrowimage. Height, this. Width-2, (this. Height-DownArrowImage.Height )));

// Draw thumb
Int ntrackheight = (this. Height-(uparrowimage. height + downarrowimage. Height ));
Float fthumbheight = (float) largechange/(float) Maximum) * ntrackheight;
Int nthumbheight = (INT) fthumbheight;

If (nthumbheight> ntrackheight ){
Nthumbheight = ntrackheight;
Fthumbheight = ntrackheight;
}
If (nthumbheight <56 ){
Nthumbheight = 56;
Fthumbheight = 56;
}

// Debug. writeline (nthumbheight. tostring ());

Float fspanheight = (fthumbheight-(thumbmiddleimage. height + thumbtopimage. height + thumbbottomimage. Height)/2.0f;
Int nspanheight = (INT) fspanheight;

Int ntop = mothumbtop;
Ntop + = uparrowimage. height;

// Draw top
E. Graphics. drawimage (thumbtopimage, new rectangle (1, ntop, this. Width-2, thumbtopimage. Height ));

Ntop + = thumbtopimage. height;
// Draw top Span
Rectangle rect = new rectangle (1, ntop, this. Width-2, nspanheight );


E. Graphics. drawimage (thumbtopspanimage, 1.0f, (float) ntop, (float) This. Width-2.0f, (float) fspanheight * 2 );

Ntop + = nspanheight;
// Draw middle
E. Graphics. drawimage (thumbmiddleimage, new rectangle (1, ntop, this. Width-2, thumbmiddleimage. Height ));


Ntop + = thumbmiddleimage. height;
// Draw top Span
Rect = new rectangle (1, ntop, this. Width-2, nspanheight * 2 );
E. Graphics. drawimage (thumbbottomspanimage, rect );

Ntop + = nspanheight;
// Draw bottom
E. Graphics. drawimage (thumbbottomimage, new rectangle (1, ntop, this. Width-2, nspanheight ));

If (downarrowimage! = NULL ){
E. Graphics. drawimage (downarrowimage, new rectangle (new point (0, (this. Height-DownArrowImage.Height), new size (this. Width, downarrowimage. Height )));
}

}
Public override bool autosize {
Get {
Return base. autosize;
}
Set {
Base. autosize = value;
If (base. autosize ){
This. width = mouparrowimage. width;
}
}
}

Private void initializecomponent (){
This. suspendlayout ();
//
// Customscrollbar
//
This. Name = "customscrollbar ";
This. mousedown + = new system. Windows. Forms. mouseeventhandler (this. customscrollbar_mousedown );
This. mousemove + = new system. Windows. Forms. mouseeventhandler (this. customscrollbar_mousemove );
This. mouseup + = new system. Windows. Forms. mouseeventhandler (this. customscrollbar_mouseup );
This. resumelayout (false );

}

Private void customscrollbar_mousedown (Object sender, mouseeventargs e ){
Point ptpoint = This. pointtoclient (cursor. position );
Int ntrackheight = (this. Height-(uparrowimage. height + downarrowimage. Height ));
Float fthumbheight = (float) largechange/(float) Maximum) * ntrackheight;
Int nthumbheight = (INT) fthumbheight;

If (nthumbheight> ntrackheight ){
Nthumbheight = ntrackheight;
Fthumbheight = ntrackheight;
}
If (nthumbheight <56 ){
Nthumbheight = 56;
Fthumbheight = 56;
}

Int ntop = mothumbtop;
Ntop + = uparrowimage. height;


Rectangle thumbrect = new rectangle (new point (1, ntop), new size (thumbmiddleimage. Width, nthumbheight ));
If (thumbrect. Contains (ptpoint ))
{

// Hit the thumb
Nclickpoint = (ptpoint. Y-ntop );
// MessageBox. Show (convert. tostring (ptpoint. Y-ntop )));
This. mothumbdown = true;
}

Rectangle uparrowrect = new rectangle (new point (1, 0), new size (uparrowimage. Width, uparrowimage. Height ));
If (uparrowrect. Contains (ptpoint ))
{

Int nrealrange = (maximum-minimum)-largechange;
Int npixelrange = (ntrackheight-nthumbheight );
If (nrealrange> 0)
{
If (npixelrange> 0)
{
If (mothumbtop-smallchange) <0)
Mothumbtop = 0;
Else
Mothumbtop-= smallchange;

// Figure out value
Float fperc = (float) mothumbtop/(float) npixelrange;
Float fvalue = fperc * (maximum-largechange );

Movalue = (INT) fvalue;
Debug. writeline (movalue. tostring ());

If (valuechanged! = NULL)
Valuechanged (this, new eventargs ());

If (scroll! = NULL)
Scroll (this, new eventargs ());

Invalidate ();
}
}
}

Rectangle downarrowrect = new rectangle (new point (1, uparrowimage. height + ntrackheight), new size (uparrowimage. Width, uparrowimage. Height ));
If (downarrowrect. Contains (ptpoint ))
{
Int nrealrange = (maximum-minimum)-largechange;
Int npixelrange = (ntrackheight-nthumbheight );
If (nrealrange> 0)
{
If (npixelrange> 0)
{
If (mothumbtop + smallchange)> npixelrange)
Mothumbtop = npixelrange;
Else
Mothumbtop + = smallchange;

// Figure out value
Float fperc = (float) mothumbtop/(float) npixelrange;
Float fvalue = fperc * (maximum-largechange );

Movalue = (INT) fvalue;
Debug. writeline (movalue. tostring ());

If (valuechanged! = NULL)
Valuechanged (this, new eventargs ());

If (scroll! = NULL)
Scroll (this, new eventargs ());

Invalidate ();
}
}
}
}

Private void customscrollbar_mouseup (Object sender, mouseeventargs e ){
This. mothumbdown = false;
This. mothumbdragging = false;
}

Private void movethumb (INT y ){
Int nrealrange = maximum-minimum;
Int ntrackheight = (this. Height-(uparrowimage. height + downarrowimage. Height ));
Float fthumbheight = (float) largechange/(float) Maximum) * ntrackheight;
Int nthumbheight = (INT) fthumbheight;

If (nthumbheight> ntrackheight ){
Nthumbheight = ntrackheight;
Fthumbheight = ntrackheight;
}
If (nthumbheight <56 ){
Nthumbheight = 56;
Fthumbheight = 56;
}

Int nspot = nclickpoint;

Int npixelrange = (ntrackheight-nthumbheight );
If (mothumbdown & nrealrange> 0 ){
If (npixelrange> 0 ){
Int nnewthumbtop = Y-(uparrowimage. height + nspot );

If (nnewthumbtop <0)
{
Mothumbtop = nnewthumbtop = 0;
}
Else if (nnewthumbtop> npixelrange)
{
Mothumbtop = nnewthumbtop = npixelrange;
}
Else {
Mothumbtop = Y-(uparrowimage. height + nspot );
}

// Figure out value
Float fperc = (float) mothumbtop/(float) npixelrange;
Float fvalue = fperc * (maximum-largechange );
Movalue = (INT) fvalue;
Debug. writeline (movalue. tostring ());

Application. doevents ();

Invalidate ();
}
}
}

Private void customscrollbar_mousemove (Object sender, mouseeventargs e ){
If (mothumbdown = true)
{
This. mothumbdragging = true;
}

If (this. mothumbdragging ){

Movethumb (E. y );
}

If (valuechanged! = NULL)
Valuechanged (this, new eventargs ());

If (scroll! = NULL)
Scroll (this, new eventargs ());
}

}

Internal class scrollbarcontroldesigner: system. Windows. Forms. Design. controldesigner {

 

Public override selectionrules {
Get {
Selectionrules = base. selectionrules;
Propertydescriptor propdescriptor = typedescriptor. getproperties (this. Component) ["autosize"];
If (propdescriptor! = NULL ){
Bool autosize = (bool) propdescriptor. getvalue (this. component );
If (autosize ){
Selectionrules = selectionrules. Visible | selectionrules. moveable | selectionrules. bottomsizeable | selectionrules. topsizeable;
}
Else {
Selectionrules = selectionrules. Visible | selectionrules. allsizeable | selectionrules. moveable;
}
}
Return selectionrules;
}
}
}
}

Vertical scroll bar code

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.