I am implementing a WinForms form in a C# project.
My form is a child of a MDI form.
My form contains a user control.
My user control contains some buttons including a validation button and a cancel one.
I want to implement the following logic :
When my form is active and the user presses the enter key then I want the validation button clicked event to be fired automatically.
When my form is active and the user presses the escape key then I want the cancel button clicked event to be fired automatically.
If my validation and my cancel buttons were not included in a user control then I would probably set the AcceptButton and CancelButton properties of my form.
Here is the code I have written in the Load event handler of my user control according to a tip given by Arthur in a comment to my first post :
// Get the container form.
form = this.FindForm();
// Simulate a click on the validation button
// when the ENTER key is pressed from the container form.
form.AcceptButton = this.cmdValider;
// Simulate a click on the cancel button
// when the ESC key is pressed from the container form.
form.CancelButton = this.cmdAnnulerEffacer;
Set the KeyPreview Property of your from true from properties;
Add keyDownEvent to your Form
In keyDownEvent of your Form, include following lines of code
The code
if(e.KeyValue==13)// When Enter Key is Pressed
{
// Last line is performing click. Other lines are making sure
// that user is not writing in a Text box
Control ct = userControl1 as Control;
ContainerControl cc = ct as ContainerControl;
if (!(cc.ActiveControl is TextBox))
validationButton.PerformClick(); // Code line to performClick
}
if(e.KeyValue==27) // When Escape Key is Pressed
{
// Last line is performing click. Other lines are making sure
// that user is not writing in a Text box
Control ct = userControl1 as Control;
ContainerControl cc = ct as ContainerControl;
if (!(cc.ActiveControl is TextBox))
cancelButton.PerformClick(); // Code line to performClick
}
validationButton or cancelButton are the names of your buttons which I am just supposing. You may have different ones. Use Your names instead of these two if you have different.
Related
This is the mock-up of a child window that I have in a Windows Forms application.
This will be shown when a button is clicked on the parent window.
When the child form opens up, the focus is in Text box1.
The Leave event on the Text box1 fires when the user tabs out of it or clicks on any button.
This triggers a validation:
if(String.IsNullOrEmpty(textBox1.Text)
{
MessageBox.Show("Please enter a value of Id.");
}
else {
... other logic omitted for brevity
}
Now the user can also click on the Cancel button to exit the form without doing any action.
Here, on the first try, the Leave event fires because the focus is in Text box1 when the Form is loaded so when the user clicks on Cancel for the first time the form does not close, instead the message box with validation message is shown.
On the second click, since the focus is no longer on Text box1, the Leave event does not fire and the form closes.
I can put the focus on any other control to handle this but for the sake of user experience I had to put the focus on Textbox1 since it's value decides the further logic of what is shown in Textbox2(Textbox1 can be left empty in which case nothing is shown in Textbox2 but that is not related to this question).
Tried this to see if I can get the Cancel button inside the Leave event of Textbox1:
Button b = sender as Button
b is NULL when Cancel is clicked.
What can I do to make the Cancel click work, without triggering the Leave event initially?
Thanks in advance,
Regards.
If you only want to supress the error message when the cancel button recieves the focus, simply check for the cancelButton.Focused flag in the leave event, then block the message if the cancel button got the focus.
Nevertheless, it is usually considered good practice to avoid modal dialog boxes if they are not required. So depending on your particular situation, you may decide to replace the MessageBox with a ToolTip instead, which will not entirely block the UI thread.
I want to set focus on a button while caret is present in textbox and user can still enter data to textbox. But when user presses enter key, button press will be simulated.
I am currently using a work around to solve this problem by handling onKeyDown event and checking for enter key. But problem is there is no clue for user to understand this as there is not blue border around the button that indicates focus on button.
Here is a example of what I want to implement (user can enter text in textbox while focus is on :
I have tried to search on google and StackOverflow but could not find any relevant result.
This is a fundamental Windows principle. It's not possible to have 2 controls (windows) focused at the same time.
So the focus should be inside the text box. But you can get the visual indication needed by setting the ok button as AcceptButton of the form (you might also want to set cancel button as CancelButton).
In the form constructor, load event or using designer:
this.AcceptButton = okButton;
There is no need to handle KeyDown event - as soon as the text box is not multiline, pressing Enter while the focus is inside it will generate ok button click. The same applies for the button set as CancelButton when you press ESC.
I have 5 child forms in my c# application. one of the child forms named childFormopens another form subForm. What i want is, when subForm is open, user cannot click or do anything inside the application without closing subForm. But this should be contained in the application only. i.e When user wants to switch to another application without closing subForm he/she wont see subForm anymore, again if user switches to the c# application the subForm form must be on top and rest of the control must be disabled.
to create and show the subForm from within the childForm i wrote a button_click event
Imagine your form contains an editbox, a Button and a close Button (x).
This may help if we have the same SDK.
Button.click += delegate{
Subform();
}
Public void Subform(){
Button closebutton = Resource.Id...;
Button Enter = Resource.id...;
Edittext Edit = Resource.Id...;
Enter.enabled = false;
Edit.editable = false;
Closebutton.click += delegate{
Mainform();
}
}
I am new to C#, I am creating a application in which there is a need of using two forms
one is Mainform and other is DialogForm.
The DialogForm has two buttons btnYes and btnNo.
whenever the user clicks the close button, FormClosing Event invokes in which I am calling the DialogForm as shown below:
DialogForm ex = new DialogForm();
ex.ShowDialog(this);
Now I want to give e.cancel=false for btnYes and e.cancel=true for btnNo. (this explained by my sir, only basics)
I know how to give functions to a Button which is in same Form but I dont know how to if the Form is different.
I have gone through some links but as I am new to c#, I can't understand it.
If you atleast provide me some links that would be appreciable.
Thanks in advance.
Forms have a property DialogResult. You can set it in the button event handlers.
DialogResult = DialogResult.Yes;
// or
DialogResult = DialogResult.No;
Then you can call the form like this
if (ex.ShowDialog(this) == DialogResult.Yes) {
// Do something
} else {
// Do something else
}
You can also set the CancelButton property of the form in the properties window. Microsoft says:
Gets or sets the button control that is clicked when the user presses the ESC key.
The form has also an AcceptButton property. Microsoft says:
Gets or sets the button on the form that is clicked when the user presses the ENTER key.
I have a C# .NET WinForm. In the form, I allow a user to add an item to a ListView by double-clicking in the ListView. This adds a TextBox control to the ListView and places the key cursor in the TextBox so a user can type.
I detect that a user is done with an item in a couple of ways (e.g. pressing Enter, Esc, Tab...), but also when they Leave (TextBox.Leave) the TextBox.
The problem is this set of steps:
User triggers TextBox.Leave by mousing down outside of the TextBox.
I add the new item to the ListView.
I select the the new item in the ListView.
Mouse up occurs and the new item that I just selected, loses focus and is unselected.
What I would like is for TextBox.Leave to be triggered by MouseUp, not MouseDown. How can I accomplish this?
Edit: Cody suggests using the ListView.LabelEdit property. Here are my results trying that:
listView_DoubleClick(...) {
listView.LabelEdit = true;
if(double clicked on existing listViewItem) {
listViewItem.BeginEdit(); //this works as expected
} else {
var newItem = listView.Items.Add("");
newItem.BeginEdit(); //this doesn't work, see below
}
}
The call to newItem.BeginEdit() only works when the user double clicks where the new item will show up. If they double click on any other blank area in the listview the new item is added, but it does not enter edit mode. What's going on here?
Pressing the mouse down on another control is causing that other control to request the focus and so the focus moving causes the TextBox.Leave event to occur. Preventing ever other possible control from requesting the focus is not a very viable option. But luckly you only need to prevent the ListView from using the MouseDown to shift focus. So you need to override the WndProc of your ListView and when the MouseDown windows message occurs and you are currently showing a TextBox you eat the message. In order words you do not allow the base class to process it.