I have a hidden control which contains a textbox control and I want to set the text property of the textbox but i get an NullReferenceException. However if I show the control, set the value and then hide it then i get no exception.
miStatus1.Show();
miStatus1.ioItem1.popIoItem(caseState);
miStatus1.Hide();
However this feels like a really unclean and not very elegant way to do it. And i'm seeing some flickering because i have to do this to 4 controls with up to 8 textboxes on each.
Is there any way to set the text propery of the textboxes while the control is hidden? Or is it perhaps a better idea to populate my textboxes when showing the control? And will this slow down my application as it needs to populate everytime the control is shown?
popIoItem - code
public void popIoItem(object obj){
if (ioType == 1)
{
tb.Text = (string)obj;
}
}
My interface
I'm trying to create the menu to the right and on each pressing of the categories the menus slide up/down and i hide/show the proper user control with the textboxes and other io-elements.
More code
When one of the boxes to the left is click'ed the following method is run:
public void openMenu(int caseNum)
{
caseDB.casesDataTable chosenCase;
chosenCase = _casesAdapter.GetDataByID(caseNum);
string caseName = "";
int caseOwner = -1;
DateTime caseDate = DateTime.Today;
string caseDesc = "";
int caseState = -1;
foreach (caseDB.casesRow casesRow in chosenCase)
{
if (!casesRow.IscaseNameNull())
caseName = casesRow.caseName;
if (!casesRow.IscaseCreatedByNull())
caseOwner = casesRow.caseCreatedBy;
if (!casesRow.IscaseCreatedNull())
caseDate = casesRow.caseCreated;
if (!casesRow.IscaseDescNull())
caseDesc = casesRow.caseDesc;
if (!casesRow.IscaseStateNull())
caseState = casesRow.caseState;
}
int caseJobs = (int)_jobsAdapter.JobCount(caseNum);
string caseStateStr = Enum.GetName(typeof(caseState), caseState);
caseInfoMenu1.popMenu(caseName, caseOwner, caseDate, caseDesc,caseJobs,caseStateStr);
}
The caseInfoMenu is the right menu. It consists of some drawing and mouse logic that draws the menu and handles hit-detection. Besides this it contains 4 user controls, one for each of the vertical tabs.
public void popMenu(string caseName, int caseOwner ,DateTime caseDate, string caseDesc, int caseJobs, string caseState)
{
marked = 0;
miGeneral1.Show();
miEconomy1.Hide();
miStatus1.Hide();
miHistory1.Hide();
miGeneral1.ioItem1.popIoItem(caseName);
miGeneral1.ioItem2.popIoItem(caseOwner.ToString());
miGeneral1.ioItem3.popIoItem(caseDate.ToShortDateString());
miGeneral1.ioItem4.popIoItem(caseJobs.ToString());
miGeneral1.ioItem5.popIoItem(caseDesc.ToString());
//miStatus1.ioItem1.popIoItem(caseState);
//This is commented out because it makes the application crash. However if I show miStatus1, set the value and hide it, it does not crash.
this.Invalidate();
}
Inside each of these user controls I have io-items user controls which essentially draws a blue box and puts a control in front of if ie. the textbox.
public partial class ioItem : UserControl
{
public int ioType { get; set; }
public int ioPadding { get; set; }
RichTextBox tb;
public ioItem()
{
InitializeComponent();
}
public void popIoItem(object obj){
if (ioType == 1)
{
tb.Text = (string)obj;
}
}
private void ioItem_Load(object sender, EventArgs e)
{
switch (ioType)
{
case 1:
tb = new RichTextBox();
tb.Location = new System.Drawing.Point(ioPadding, ioPadding);
tb.Name = "textbox";
tb.Size = new Size(this.Size.Width - (ioPadding * 2), this.Size.Height - (ioPadding * 2));
tb.BorderStyle = BorderStyle.None;
tb.Visible = true;
tb.BackColor = Color.FromArgb(255, 184, 198, 208);
tb.Font = new Font("Microsoft Sans Serif", 7);
this.Controls.Add(tb);
break;
case 2:
historyCtrl hiCtrl = new historyCtrl();
hiCtrl.Location = new Point(0,0);
hiCtrl.Size = new Size(this.Width, this.Height);
hiCtrl.Name = "history";
hiCtrl.Visible = true;
hiCtrl.BackColor = Color.FromArgb(255, 184, 198, 208);
this.Controls.Add(hiCtrl);
break;
default:
goto case 1;
}
}
}
