So I have 2 controls on my main form, a custom hexbox control and a richtextbox as in the picture below (It wouldnt let me post an image so will have to follow the link). What I would like to do is depending on where the user has clicked in the hexbox control, the rich textbox on the right will scroll to an associated line.
http://i.stack.imgur.com/8PfRt.jpg
The current issue I'm having is that the code to handle the hexbox click is contained in a separate class (hexbox.cs) and so I'm not able to then take the location of the click and scroll to the associated line in the richtextbox which is contained in the mainform class. I attempted to create a new instance of the mainform to access the richtextbox but obviously this results is the creation of a new richtexbox with none of the original content.
Heres the code in the hexbox class that deals with a mouse click if its any help:
void SetCaretPosition(Point p)
{
System.Diagnostics.Debug.WriteLine("SetCaretPosition()", "HexBox");
if (_byteProvider == null || _keyInterpreter == null)
return;
long pos = _bytePos;
int cp = _byteCharacterPos;
if(_recHex.Contains(p))
{
BytePositionInfo bpi = GetHexBytePositionInfo(p);
pos = bpi.Index;
cp = bpi.CharacterPosition;
SetPosition(pos, cp);
ActivateKeyInterpreter();
UpdateCaret();
Invalidate();
}
else if(_recStringView.Contains(p))
{
BytePositionInfo bpi = GetStringBytePositionInfo(p);
pos = bpi.Index;
cp = bpi.CharacterPosition;
SetPosition(pos, cp);
ActivateStringKeyInterpreter();
UpdateCaret();
Invalidate();
}
}
If I undersntand properly, this should help.
If you have access to hexbox class, you can expose event (MouseClick - or similar) - or even create your own with args prividig selected line - subscribe to this event in your Form.
Then when user click your form class'll be notified .
class HexBox : UserControl{
// ..
}
public class MyForm :Form{
public MyForm(){
HexBox hexBox = new HexBox();
Controls.Add(hexBox);
hexBox.MouseDown += (sender, args) =>{
// call your scroll to function
};
InitializeComponent();
}
}
Related
I have a Winforms Application with a TabStrip Control. During runtime, UserControls are to be loaded into different tabs dynamically.
I want to present a "User Control xyz is loading" message to the user (setting an existing label to visible and changing its text) before the UserControl is loaded and until the loading is completely finished.
My approaches so far:
Trying to load the User Control in a BackgroundWorker thread. This fails, because I have to access Gui-Controls during the load of the UserControl
Trying to show the message in a BackgroundWorker thread. This obviously fails because the BackgroundWorker thread is not the UI thread ;-)
Show the Message, call DoEvents(), load the UserControl. This leads to different behaviour (flickering, ...) everytime I load a UserControl, and I can not control when and how to set it to invisible again.
To sum it up, I have two questions:
How to ensure the message is visible directly, before loading the User control
How to ensure the message is set to invisible again, just in the moment the UserControl is completely loaded (including all DataBindings, grid formattings, etc.)
what we use is similar to this:
create a new form that has whatever you want to show the user,
implement a static method where you can call this form to be created inside itself, to prevent memory leaks
create a new thread within this form so that form is running in a seperated thread and stays responsive; we use an ajax control that shows a progress bar filling up.
within the method you use to start the thread set its properties to topmost true to ensure it stays on top.
for instance do this in your main form:
loadingForm.ShowLoadingScreen("usercontrollname");
//do something
loadingform.CloseLoadingScreen();
in the loading form class;
public LoadingScreen()
{
InitializeComponent();
}
public static void ShowLoadingScreen(string usercontrollname)
{
// do something with the usercontroll name if desired
if (_LoadingScreenThread == null)
{
_LoadingScreenThread = new Thread(new ThreadStart(DoShowLoadingScreen));
_LoadingScreenThread.IsBackground = true;
_LoadingScreenThread.Start();
}
}
public static void CloseLoadingScreen()
{
if (_ls.InvokeRequired)
{
_ls.Invoke(new MethodInvoker(CloseLoadingScreen));
}
else
{
Application.ExitThread();
_ls.Dispose();
_LoadingScreenThread = null;
}
}
private static void DoShowLoadingScreen()
{
_ls = new LoadingScreen();
_ls.FormBorderStyle = FormBorderStyle.None;
_ls.MinimizeBox = false;
_ls.ControlBox = false;
_ls.MaximizeBox = false;
_ls.TopMost = true;
_ls.StartPosition = FormStartPosition.CenterScreen;
Application.Run(_ls);
}
Try again your second approach:
Trying to show the message in a BackgroundWorker thread. This obviously fails because the BackgroundWorker thread is not the UI thread ;-)
But this time, use the following code in your background thread in order to update your label:
label.Invoke((MethodInvoker) delegate {
label.Text = "User Control xyz is loading";
label.Visible = true;
});
// Load your user control
// ...
label.Invoke((MethodInvoker) delegate {
label.Visible = false;
});
Invoke allows you to update your UI in another thread.
Working from #wterbeek's example, I modified the class for my own purposes:
center it over the loading form
modification of its opacity
sizing it to the parent size
show it as a dialog and block all user interaction
I was required to show a throbber
I received a null error on line:
if (_ls.InvokeRequired)
so I added a _shown condition (if the action completes so fast that the _LoadingScreenThread thread is not even run) to check if the form exists or not.
Also, if the _LoadingScreenThread is not started, Application.Exit will close the main thread.
I thought to post it for it may help someone else. Comments in the code will explain more.
public partial class LoadingScreen : Form {
private static Thread _LoadingScreenThread;
private static LoadingScreen _ls;
//condition required to check if the form has been loaded
private static bool _shown = false;
private static Form _parent;
public LoadingScreen() {
InitializeComponent();
}
//added the parent to the initializer
//CHECKS FOR NULL HAVE NOT BEEN IMPLEMENTED
public static void ShowLoadingScreen(string usercontrollname, Form parent) {
// do something with the usercontroll name if desired
_parent = parent;
if (_LoadingScreenThread == null) {
_LoadingScreenThread = new Thread(new ThreadStart(DoShowLoadingScreen));
_LoadingScreenThread.SetApartmentState(ApartmentState.STA);
_LoadingScreenThread.IsBackground = true;
_LoadingScreenThread.Start();
}
}
public static void CloseLoadingScreen() {
//if the operation is too short, the _ls is not correctly initialized and it throws
//a null error
if (_ls!=null && _ls.InvokeRequired) {
_ls.Invoke(new MethodInvoker(CloseLoadingScreen));
} else {
if (_shown)
{
//if the operation is too short and the thread is not started
//this would close the main thread
_shown = false;
Application.ExitThread();
}
if (_LoadingScreenThread != null)
_LoadingScreenThread.Interrupt();
//this check prevents the appearance of the loader
//or its closing/disposing if shown
//have not found the answer
//if (_ls !=null)
//{
_ls.Close();
_ls.Dispose();
//}
_LoadingScreenThread = null;
}
}
private static void DoShowLoadingScreen() {
_ls = new LoadingScreen();
_ls.FormBorderStyle = FormBorderStyle.None;
_ls.MinimizeBox = false;
_ls.ControlBox = false;
_ls.MaximizeBox = false;
_ls.TopMost = true;
//get the parent size
_ls.Size = _parent.Size;
//get the location of the parent in order to show the form over the
//target form
_ls.Location = _parent.Location;
//in order to use the size and the location specified above
//we need to set the start position to "Manual"
_ls.StartPosition =FormStartPosition.Manual;
//set the opacity
_ls.Opacity = 0.5;
_shown = true;
//Replaced Application.Run with ShowDialog to show as dialog
//Application.Run(_ls);
_ls.ShowDialog();
}
}
I have a strange problem with devexpress AlertControl. I create an alertu using this code
AlertInfo alertInfo = new AlertInfo(caption, text);
AlertControl control = new AlertControl();
control.FormLocation = AlertFormLocation.BottomRight;
control.Show(null,alertInfo);
this code is placed in backgroundWorker_DoWork function and it is supposed to display alerts from time to time. The problem is that alerts are not shown. I can see that show method is invoked however alerts are not shown.
Acording to documentation is I pass null as a parametr of Show function , notification should be shown on main monitor.
What can I do to make it work ?
Considering you're using a worker, I guess it's a thread problem. Try wrapping your code inside an Action object:
Action action = () =>
{
AlertControl control = new AlertControl();
control.FormLocation = AlertFormLocation.BottomRight;
control.Show(this, alertInfo); // "this" being a Form
};
this.Invoke(action);
I use a similar code inside a form with good results and once did a similar code using an AlertControl too.
Your AlertControl need a Parent Control.
AlertControl control = new AlertControl();
control.FormLocation = AlertFormLocation.BottomRight;
control.Show(MyForm,alertInfo); //replace null with a Form/Control instance
You call the Show method with a null paramater - where you should have use an instance of a Form/Control
Don't know anything about the devexpress controls, but maybe you have to show the alert from the main thread via invoke methode?
using DevExpress.XtraBars.Alerter;
// Create a regular custom button.
AlertButton btn1 = new AlertButton(Image.FromFile(#"c:\folder-16x16.png"));
btn1.Hint = "Open file";
btn1.Name = "buttonOpen";
// Create a check custom button.
AlertButton btn2 = new AlertButton(Image.FromFile(#"c:\clock-16x16.png"));
btn2.Style = AlertButtonStyle.CheckButton;
btn2.Down = true;
btn2.Hint = "Alert On";
btn2.Name = "buttonAlert";
// Add buttons to the AlertControl and subscribe to the events to process button clicks
alertControl1.Buttons.Add(btn1);
alertControl1.Buttons.Add(btn2);
alertControl1.ButtonClick += new AlertButtonClickEventHandler(alertControl1_ButtonClick);
alertControl1.ButtonDownChanged +=
new AlertButtonDownChangedEventHandler(alertControl1_ButtonDownChanged);
// Show a sample alert window.
AlertInfo info = new AlertInfo("New Window", "Text");
alertControl1.Show(this, info);
void alertControl1_ButtonDownChanged(object sender,
AlertButtonDownChangedEventArgs e) {
if (e.ButtonName == "buttonOpen") {
//...
}
}
void alertControl1_ButtonClick(object sender, AlertButtonClickEventArgs e) {
if (e.ButtonName == "buttonAlert") {
//...
}
}
ref:https://documentation.devexpress.com/#WindowsForms/clsDevExpressXtraBarsAlerterAlertControltopic
I have a windows form application. On the main form a user will enter a number of item, etc and then click a button which will open a new form (either a small form or a large form depending on a checkbox). Now on my main application I have a file menu - under which is settings - change background colour. This opens the colordialog. If a user does not pick anything the background colours will stay default. However if they change it on the main entry form i change the background of a few textboxes - code below.
private void warning1ToolStripMenuItem_Click(object sender, EventArgs e)
{
colorDialog1.ShowDialog();
Warn1Color = colorDialog1.Color.ToString();
if (Warn1Color != null)
{
tbWarn1Hrs.BackColor = colorDialog1.Color;
tbWarn1Mins.BackColor = colorDialog1.Color;
tbWarn1Secs.BackColor = colorDialog1.Color;
tbWarn1Msg.BackColor = colorDialog1.Color;
}
}
Now my problem is how to I get this to then change the background in the other form that opens. I was hoping I could pass the string across in the new form constructor as i do with a number of other values.
i.e - here is my code in the new form....(note - string Warn1Color was passed across in constructor and then made = to the string _Warn1Color. If it is null then background will be default yellow but it cant convert type string to system.drawing.color. Does anyone see an easy solution to this or what I could do to get this working easily.
if (_Warn1Color == null)
{
this.BackColor = System.Drawing.Color.Yellow;
}
else
this.BackColor = _Warn1Color;
Pass the Color on via the Constructor not a string. If this is not possibly for whatever reason, you could create a ColorConfigClass that holds the required Color and you can set it when used.
You should create a static class to store your configuration data such as this colour style. You can then set this value once you have prompted the user for the change and you can also call the Color value from any other form when you need to use it.
Your static class should look something like this...
public static class StyleSettings{
private static Color _warn1Color = Color.FromArgb(255, 0, 0);//default colour
public static Color Warn1Color {
get { return _warn1Color; }
set { _warn1Color = value; }
}
}
Then you can use this in your example method like...
private void warning1ToolStripMenuItem_Click(object sender, EventArgs e)
{
if (colorDialog1.ShowDialog() == DialogResult.OK)
{
StyleSettings.Warn1Color = colorDialog1.Color;
tbWarn1Hrs.BackColor = StyleSettings.Warn1Color;
tbWarn1Mins.BackColor = StyleSettings.Warn1Color;
tbWarn1Secs.BackColor = StyleSettings.Warn1Color;
tbWarn1Msg.BackColor = StyleSettings.Warn1Color;
}
}
I assume you used a string because you wanted to be able to pass null, and System.Drawing.Color being a struct can not be null.
In which case either use Nullable ( http://msdn.microsoft.com/en-us/library/b3h38hb0%28v=vs.80%29.aspx ) which can be null or you can consider some other value as "default", say alpha=0.
To pass a value in your constructor simply go to the code file for the form (the one where you code the stuff for the events) and find the constructor function (has the same name as the form) e.g.:
namespace MyApp
{
public partial class MyForm : Form
{
public MyForm()
{
InitializeComponent();
}
...
And add the parameters to it:
namespace MyApp
{
public partial class MyForm : Form
{
public MyForm(System.drawing.color background)
{
InitializeComponent();
...do whatever you want with background...
}
...
Of course you also need to edit the places you create this form, e.g. change
form = new MyForm();
form.Show();
to
form = new MyForm(backgroundColour);
form.Show();
I have a main form that has most of the functionality in it. I was just wondering how would I pass on a variable from say a pop up form, to that main form.
Like for instance:
I have a main form that needs some connection info. So when you click the button "Enter Connection Info", it opens up a new form that the user can type in the IP Address he wants to use for his connection.
On this new form, I have a textbox and a button and once you enter the information it should close and pass on the string that contains the ip back to the original form.
Any suggestions? Do you think there is a better method of accomplishing this than using a windows form, and just going ahead and using a windows form or something? I'm quite perplexed on this issue at the moment.
Expose the textbox text as a public read only property. Show the connection form as a dialog and when it closes, get the connection from the property and then dispose the form:
in open form handler (button click, menu, whatever)
string connectionString = null;
using (ConnectionForm form = new ConnectionForm())
{
DialogResult result = form.ShowDialog();
if (result == DialogResult.Ok)
connectionString = form.ConnectionString
}
In you connection form:
public class ConnectionForm: Form
{
....
public string ConnectionString { get { return textBox1.Text; } }
}
You can create a public property in your main form and pass main form instance in pop-up constructor. In this way you can change the main form property.
You can also create an event in your pop-up form and hook it in your main form.
I like to use a pattern sort of like this (bear with me, c# is not my first language):
public class ValueForm: Form
{
public static string GetFromUser(string originalValue)
{
using (ConnectionForm form = new ConnectionForm())
{
form.TheValue = originalValue;
var result = form.ShowDialog();
if (result == DialogResult.Ok)
return form.TheValue;
else
return originalValue;
}
}
public string TheValue {
get { return textBox1.Text; }
set { textBox1.Text = value; }
}
/* also some code behind your OK & cancel buttons to set
DialogResult appropriately,
and do any validation that you need to do
*/
}
and then you would use this like:
string newValue = ValueForm.GetFromUser(oldValue);
Reference Bind the controls on the dialog Form to properties of the Parent Form.
public dlgDbConnProps ( Form Owner )
{
// TODO: Complete member initialization
InitializeComponent ( );
owner = Owner;
}
private void cbo_ProviderLst_SelectedIndexChanged ( object sender, EventArgs e )
{
owner.Provider = cboLst.Text;
}
Here is another method that I have implemented:
... pass a Func to the child form constructor:
public dlgRequestLogin ( Func<string, string, bool> LoginMethod )
{
InitializeComponent ( );
p_loginMethod = LoginMethod;
}
... then handle on button click (or other appropriate event):
private void cmd_SendLoginCredentials_Click ( object sender, EventArgs e )
{
bool res = p_loginMethod.Invoke ( txt_UserID.Text, txt_UserPassword.Text );
}
I have a simple winforms application, on performing operations it shows a child window everytime. If I open a browser window (fully maximized) or some other window as usual
the application goes back with its childwindow, on clicking the exe which is in the taskbar
only the child window gets visible,but the application window doesn't come into view. I want to know how to show both the windows when I select it from taskbar.
childwindow is also a winform,whose toplevel property is set as true,apart from it nothing
is new(JUST BY CLICKING A BUTTON OR CELL IN GRID I CREATE AN OBJECT FOR THE FORM AND USES IT SHOW PROPERTY TO SHOW)
AlertMsgWindow _alertMsg;
void dataGridViewAlerts_MouseDoubleClick(object sender, MouseEventArgs e)
{
try
{
if (!string.IsNullOrEmpty(this.dataGridViewAlerts.getValue(0, this.dataGridViewAlerts.SelectedRow)))
{
this.dataGridViewAlerts.setCellImage(0, this.dataGridViewAlerts.SelectedRow, "NewsIconRead");
if (_alertMsg == null || _alertMsg.IsDisposed)
{
if (_alertMsg != null)
{
_alertMsg.onDeleteMessageRequest -= new DeleteMessage(_alertMsg_onDeleteMessageRequest);
_alertMsg.Dispose();
}
_alertMsg = new AlertMsgWindow();
_alertMsg.onDeleteMessageRequest += new DeleteMessage(_alertMsg_onDeleteMessageRequest);
}
_alertMsg.FillDetails(alertDetails[IDcollection[this.dataGridViewAlerts.SelectedRow]]);
if (!_alertMsg.Visible)
{
_alertMsg.Location = PointToScreen(new Point(this.Width / 4, -this.Height));
_alertMsg.Show(this);
}
if (onReadMessageReq != null)
onReadMessageReq(IDcollection[this.dataGridViewAlerts.SelectedRow]);
}
}
catch (Exception)
{ }
}
Note: THIS IS HAPPENING ONLY IN WINDOWS2000
I used a component named Dotnetmagic.dll,i dont know whether it causes the problem.can somebody helps me to solve this
I replaced these lines
_alertMsg.Location = PointToScreen(new Point(this.Width / 4, -this.Height));
With
_alertMsg.Left = x;
_alertMsg.Top = y;
and it solved my problem