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//——————————————————————————
/// <copyright from=1997 to=2001 company=microsoft corporation>
/// copyright (c) microsoft corporation. all rights reserved.
///
/// this source code is intended only as a supplement to microsoft
/// development tools and/or on-line documentation. see these other
/// materials for detailed information regarding microsoft code samples.
///
/// </copyright>
//——————————————————————————
namespace microsoft.samples.windows.forms.cs.progressbarctl {
using system;
using system.collections;
using system.componentmodel;
using system.drawing;
using system.windows.forms;
using system.threading;
// <doc>
// <desc>
// this class demonstrates the progressbar control.
// the progressbar is updated periodically via another thread based on the
// settings in this control
// </desc>
// </doc>
//
public class progressbarctl : system.windows.forms.form {
private system.componentmodel.container components;
protected internal system.windows.forms.label label3;
protected internal system.windows.forms.label lblcompleted;
protected internal system.windows.forms.trackbar sldrspeed;
protected internal system.windows.forms.progressbar progbar;
protected internal system.windows.forms.label label5;
protected internal system.windows.forms.groupbox grpbehavior;
protected internal system.windows.forms.label label4;
protected internal system.windows.forms.label label6;
protected internal system.windows.forms.label lblvalue;
protected internal system.windows.forms.combobox cmbstep;
private int isleeptime ;
private thread timedprogress ;
public progressbarctl() : base() {
//
// required for win form designer support
//
initializecomponent();
//
// todo: add any constructor code after initializecomponent call
//
isleeptime = 100 ;
cmbstep.selectedindex = 0 ;
progbar.step = 1 ;
}
protected override void onload(eventargs e) {
// spin off a new thread to update the progressbar control
timedprogress = new thread(new threadstart(timedprogressproc));
timedprogress.isbackground = true;
timedprogress.start();
}
// <doc>
// <desc>
// this code executes on the windows.forms thread.
// </desc>
// </doc>
//
private void updateprogress() {
int min ;
double numerator, denominator, completed ;
//reset to start if required
if (progbar.value == progbar.maximum) {
progbar.value = progbar.minimum ;
}
else {
progbar.performstep();
}
lblvalue.text = progbar.value.tostring();
min = progbar.minimum ;
numerator = progbar.value – min ;
denominator = progbar.maximum – min ;
completed = (numerator / denominator) * 100.0 ;
lblcompleted.text = math.round(completed).tostring() + "%" ;
}
// <doc>
// <desc>
// this function runs in the timedprogress thread and updates the
// progressbar on the form.
// </desc>
// </doc>
//
private void timedprogressproc() {
try {
methodinvoker mi = new methodinvoker(updateprogress);
while (true) {
invoke(mi);
int isleeptime = this.sleeptime;
thread.sleep(isleeptime) ;
}
}
//thrown when the thread is interupted by the main thread – exiting the loop
catch (threadinterruptedexception e) {
if (e != null) {}
}
catch (exception we) {
if (we != null) {
messagebox.show(we.tostring());
}
}
}
// <doc>
// <desc>
// property controlling the progress of the progress bar – used by the background thread
// </desc>
// </doc>
//
private int sleeptime {
get {
lock(this) {
return isleeptime ;
}
}
set {
lock(this) {
isleeptime = value ;
}
}
}
/// <summary>
/// clean up any resources being used
/// </summary>
public override void dispose() {
/*
* we have to make sure that our thread doesnt attempt
* to access our controls after we dispose them.
*/
if (timedprogress != null) {
timedprogress.interrupt();
timedprogress = null;
}
base.dispose();
components.dispose();
}
protected void sldrspeed_scroll(object sender, eventargs e) {
trackbar tb = (trackbar) sender ;
int time = 110 – tb.value ;
this.sleeptime = time ;
}
protected void cmbstep_selectedindexchanged(object sender, eventargs e) {
try {
progbar.step = int32.parse((string)cmbstep.selecteditem);
}
catch (exception ex) {
// thrown if int32.parse cant convert
if (ex !=null) {}
}
}
/// <summary>
/// required method for designer support – do not modify
/// the contents of this method with the code editor
/// </summary>
private void initializecomponent() {
this.lblvalue = new system.windows.forms.label();
this.label4 = new system.windows.forms.label();
this.label5 = new system.windows.forms.label();
this.progbar = new system.windows.forms.progressbar();
this.grpbehavior = new system.windows.forms.groupbox();
this.cmbstep = new system.windows.forms.combobox();
this.label3 = new system.windows.forms.label();
this.sldrspeed = new system.windows.forms.trackbar();
this.label6 = new system.windows.forms.label();
this.lblcompleted = new system.windows.forms.label();
this.grpbehavior.suspendlayout();
((system.componentmodel.isupportinitialize)(this.sldrspeed)).begininit();
this.suspendlayout();
//
// lblvalue
//
this.lblvalue.location = new system.drawing.point(164, 93);
this.lblvalue.name = "lblvalue";
this.lblvalue.size = new system.drawing.size(72, 18);
this.lblvalue.tabindex = 4;
//
// label4
//
this.label4.location = new system.drawing.point(20, 93);
this.label4.name = "label4";
this.label4.size = new system.drawing.size(288, 18);
this.label4.tabindex = 0;
this.label4.text = "completion speed:";
//
// label5
//
this.label5.location = new system.drawing.point(31, 65);
this.label5.name = "label5";
this.label5.size = new system.drawing.size(143, 28);
this.label5.tabindex = 1;
this.label5.text = "percent completed:";
//
// progbar
//
this.progbar.backcolor = system.drawing.systemcolors.control;
this.progbar.location = new system.drawing.point(31, 28);
this.progbar.name = "progbar";
this.progbar.size = new system.drawing.size(245, 18);
this.progbar.step = 1;
this.progbar.tabindex = 0;
this.progbar.text = "progbar";
//
// grpbehavior
//
this.grpbehavior.controls.addrange(new system.windows.forms.control[] {
this.cmbstep,
this.label3,
this.sldrspeed,
this.label4});
this.grpbehavior.location = new system.drawing.point(317, 19);
this.grpbehavior.name = "grpbehavior";
this.grpbehavior.size = new system.drawing.size(318, 175);
this.grpbehavior.tabindex = 5;
this.grpbehavior.tabstop = false;
this.grpbehavior.text = "progressbar";
//
// cmbstep
//
this.cmbstep.dropdownstyle = system.windows.forms.comboboxstyle.dropdownlist;
this.cmbstep.dropdownwidth = 123;
this.cmbstep.items.addrange(new object[] {
"1",
"5",
"10",
"20"});
this.cmbstep.location = new system.drawing.point(174, 28);
this.cmbstep.name = "cmbstep";
this.cmbstep.size = new system.drawing.size(123, 20);
this.cmbstep.tabindex = 7;
this.cmbstep.selectedindexchanged += new system.eventhandler(this.cmbstep_selectedindexchanged);
//
// label3
//
this.label3.location = new system.drawing.point(20, 28);
this.label3.name = "label3";
this.label3.size = new system.drawing.size(62, 18);
this.label3.tabindex = 6;
this.label3.text = "step:";
//
// sldrspeed
//
this.sldrspeed.backcolor = system.drawing.systemcolors.control;
this.sldrspeed.location = new system.drawing.point(20, 111);
this.sldrspeed.maximum = 100;
this.sldrspeed.minimum = 10;
this.sldrspeed.name = "sldrspeed";
this.sldrspeed.size = new system.drawing.size(277, 42);
this.sldrspeed.tabindex = 1;
this.sldrspeed.tabstop = false;
this.sldrspeed.text = "trackbar1";
this.sldrspeed.tickfrequency = 10;
this.sldrspeed.value = 10;
this.sldrspeed.scroll += new system.eventhandler(this.sldrspeed_scroll);
//
// label6
//
this.label6.location = new system.drawing.point(31, 93);
this.label6.name = "label6";
this.label6.size = new system.drawing.size(128, 18);
this.label6.tabindex = 3;
this.label6.text = "value:";
//
// lblcompleted
//
this.lblcompleted.location = new system.drawing.point(164, 65);
this.lblcompleted.name = "lblcompleted";
this.lblcompleted.size = new system.drawing.size(72, 18);
this.lblcompleted.tabindex = 2;
//
// progressbarctl
//
this.autoscalebasesize = new system.drawing.size(6, 14);
this.clientsize = new system.drawing.size(647, 202);
this.controls.addrange(new system.windows.forms.control[] {
this.grpbehavior,
this.lblvalue,
this.label6,
this.lblcompleted,
this.label5,
this.progbar});
this.formborderstyle = system.windows.forms.formborderstyle.fixeddialog;
this.maximizebox = false;
this.minimizebox = false;
this.name = "progressbarctl";
this.text = "progressbar";
this.load += new system.eventhandler(this.progressbarctl_load);
this.grpbehavior.resumelayout(false);
((system.componentmodel.isupportinitialize)(this.sldrspeed)).endinit();
this.resumelayout(false);
}
// the main entry point for the application.
[stathread]
public static void main(string[] args) {
application.run(new progressbarctl());
}
private void progressbarctl_load(object sender, system.eventargs e)
{
}
}
}
