I made a fully functional touch-keyboard within my WPF application using both XAML and C# (ofc). Currently, every key pressed on the keyboard registers the respective key in the text box; however, if the user touches the TextBox (which is welcomed...I do not want to prevent it) to position the cursor earlier in the TextBox to fix an error they might have typed AND THEN interact with the keys (as expected), the position they requested does not register and the keys continue to be entered on the end.
For example, user types(note the | acting as the cursor)::
Justin is awesome, bt that is because it is his birthday.|
User sees error in the word "but" spelled as "bt" so decides to touch the screen to position the cursor between b and t like so:
Justin is awesome, b|t that is because it is his birthday.
User expects then to touch U on the keyboard and it to be entered where the cursor appears to be...unfortunately (currently) it ends up like this:
Justin is awesome, bt that is because it is his birthday.U|
If I enable the mouse, the same thing happens (so it may not be exclusive to touch). If I plug in a keyboard after touching a position, I can type with said plugged-in keyboard no problem.
The implemented touch keyboard just wont read the position correctly. Looking at this, the action seems to go no where because the Cursor Position goes from the TextBox to a Button (keyboard keys).
Here's a snippet of code for anyone to test (obviously can't provide the full keyboard):
XAML
<Grid>
<TextBox x:Name="txtBox" />
<Button x:Name="btnQ" Content="q" Click="btnQ_Click"/>
<Button x:Name="btnW" Content="w" Click="btnW_Click"/>
</Grid>
C#
private bool numberHitSinceLastOperator = false;
private void HandleKeyboard(string key)
{
//Ternary operator
string valueSoFar = numberHitSinceLastOperator ? txtBox.Text : "";
string newValue = valueSoFar + key.ToString();
txtBox.Text = newValue;
numberHitSinceLastOperator = true;
}
private void btnQ_Click(object sender, RoutedEventArgs e)
{
HandleKeyboard("Q");
}
private void btnW_Click(object sender, RoutedEventArgs e)
{
HandleKeyboard("W");
}
Your problem is this line:
string newValue = valueSoFar + key.ToString();
You are always appending at the end. To append at the right position, you can do something like this:
int oldCaretIndex = txtBox.CaretIndex;
txtBox.Text = txtBox.Text.Insert(text.CaretIndex, "a");
//changing Text resets the caret position to 0
txtBox.CaretIndex = oldCaretIndex + 1;
You could also try simulating key presses, see for example here: How can I programmatically generate keypress events in C#?
Or, like the commenter suggested, try the SurfaceSDK (though I haven't used it myself).
Related
When i try to type something in the input field, the text shows up in the input field while typing. The moment I press the back button, it clears itself. If I enter the done button or press the OK button in input space at the top of the keyboard, then only it saves the text. Unlike android studio, input doesn't saves the text dynamically. I know that clearing the field on escape is made by design in unity. I followed a thread - pushing-back-button-escape-reverts-text-in-input-field, but there I couldn't find a proper answer. I also saw Esc Key Issue with Input Field in unity forum. But couldn't find a solution.
I have tried putting this to my code
InputField textToSend;
string stringEdit = "";
public void OnEditting()
{
if (!Input.GetKeyDown(KeyCode.Escape))
{
stringEdit = textToSend.text;
}
}
public void OnEndEdit()
{
if (Input.GetKeyDown(KeyCode.Escape))
{
textToSend.text = stringEdit;
}
}
Please help me finding a solution for keeping the text after hitting the back button.
Try this:
textToSend.onValueChanged.AddListener(delegate { OnValueChangesInputField(); })
public void OnValueChangesInputField()
{
//Dynamic Text, get the string as it is being types
string dynamicText = textToSend.text;
}
I have not dealt with WinForms for a long time.
Now I'm stuck with something trivial but cannot figure it out.
I have a Winform and when a Timer Tick happens I want to show a message in a new form message box:
frmMessage frmM = new frmMessage();
frmM.txtMessage.Text = ConfigurationSettings.AppSettings["Message"];
frmM.Show();
It works but the text in the textbox shows as selected(with a blue background).
I tried
txtMessage.SelectionLength = 0;
Did not help.
Also tried to set focus to a different control, did not help either.
for now, as a workaround, I will use a Label.
This is a consequence of the way TextBox Class is implemented. If a selection is not specifically set, all text will be selected when the control gets focus.
From TextBox.OnGotFocus:
Protected override void OnGotFocus(EventArgs e) {
base.OnGotFocus(e);
If (!selectionSet) {
// We get one shot at selecting when we first get focus. If we don't
// do it, we still want to act Like the selection was set.
selectionSet = true;
// If the user didn't provide a selection, force one in.
If (SelectionLength == 0 && Control.MouseButtons == MouseButtons.None) {
SelectAll();
}
}
Additionally due to the way the SelectionLength Property is implemented, setting that property to zero does not set the selectionSet` flag as it is already zero.
Instead, set the TextBox.SelectionStart Property immediately after setting the text as this will set that flag.
txtMessage.SelectionStart = 0;
However, your work-a-round of using a Label to display a message is much more appropriate than using an input control.
This is not the best answer but it works. You can try this
frmMessage frmM = new frmMessage();
frmM.txtMessage.Text = "";
frmM.txtMessage.AppendText(ConfigurationSettings.AppSettings["Message"]);
frmM.Show();
I would like to have three textboxes for user input, but for each textbox I would like a different keyboard layout to be used while entering text (without the need to manually change the kayboard layout).
In textxbox 1 I would like my normal (swedish) keyboard layout to be used while I write. In the second I would like to have Japanese Hiragana layout. And in the third I would like too have Japanese Katakana layout.
Is it possible to do?
As it is now I must manually change the keyboard layout with Windowskey+Space (this cycles through all keyboard layouts).
Hope this works for you:
private void textBox1_Enter(object sender, EventArgs e)
{
// Get index of current Input Language
int currentLang = InputLanguage.InstalledInputLanguages.IndexOf(InputLanguage.CurrentInputLanguage);
// Calculate next Input Language
InputLanguage nextLang = ++currentLang == InputLanguage.InstalledInputLanguages.Count ? InputLanguage.InstalledInputLanguages[0] : InputLanguage.InstalledInputLanguages[currentLang];
// Change current Language to the calculated:
ChangeInputLanguage(nextLang);
}
public void ChangeInputLanguage(InputLanguage InputLang)
{
// Check is this Language really installed. Raise exception to warn if it is not:
if (InputLanguage.InstalledInputLanguages.IndexOf(InputLang) == -1)
throw new ArgumentOutOfRangeException();
// InputLAnguage changes here:
InputLanguage.CurrentInputLanguage = InputLang;
}
Here is the reference link - Change Input Language programmatically?
I'm working on a text editor which includes a RichTextBox. One of the features that I want to implement is to show in a TextBox the current Line and Column of the caret of the forementioned RichTextBox at any moment.
Here's part of the code that I use (the rest of my code has nothing to do with my issue):
int selectionStart = richTextBox.SelectionStart;
int lineFromCharIndex = richTextBox.GetLineFromCharIndex(selectionStart);
int charIndexFromLine = richTextBox.GetFirstCharIndexFromLine(lineFromCharIndex);
currentLine = richTextBox.GetLineFromCharIndex(selectionStart) + 1;
currentCol = richTextBox.SelectionStart - charIndexFromLine + 1;
At this point, I should mention that when someone is using a RichTextBox, there are three ways that the caret can change location:
By changing the Text of the RichTextBox
By using the arrow keys on the keyboard
By clicking anywhere on the RichTextBox
The code that I posted above works with no issues in the first two cases. However, it doesn't really work in the third case.
I tried using the Click event and I noticed that the selectionStart variable would always get the value of 0, which means that I always get the same and wrong results. Moreover, using the same code on other events like MouseClick and MouseUp did not solve my problem since selectionStart is 0 even in the duration of these events.
So, how can I get the current Line and column everytime the user clicks on the RichTextBox?
You want something like:
private void richTextBox1_MouseUp(object sender, MouseEventArgs e)
{
RichTextBox box = (RichTextBox)sender;
Point mouseLocation = new Point(e.X, e.Y);
box.SelectionStart = box.GetCharIndexFromPosition(mouseLocation);
box.SelectionLength = 0;
int selectionStart = richTextBox.SelectionStart;
int lineFromCharIndex = box.GetLineFromCharIndex(selectionStart);
int charIndexFromLine = box.GetFirstCharIndexFromLine(lineFromCharIndex);
currentLine = box.GetLineFromCharIndex(selectionStart) + 1;
currentCol = box.SelectionStart - charIndexFromLine + 1;
}
It seems to me that what you really want is to handle the TextBoxBase.SelectionChanged event. Then any action that causes the selection to change will invoke your code, and as an added benefit the current selection will have been updated by the time your event handler is called, and you'll be assured of getting correct values.
If that does not address your specific need, then I must not be understanding the question. In that case, please provide a good, minimal, complete code example that shows clearly what you're trying to do, with a precise description of what that code does and how that's different from what you want it to do.
I am programatically adding text in a custom RichTextBox using a KeyPress event:
SelectedText = e.KeyChar.ToString();
The problem is that inserting text in such a way doesn't trigger the CanUndo flag.
As such, when I try to Undo / Redo text (by calling the Undo() and Redo() methods of the textbox), nothing happens.
I tried programatically evoking the KeyUp() event from within a TextChanged() event, but that still didn't flag CanUndo to true.
How can I undo text that I insert without having to create lists for Undo and Redo operations ?
Thanks
I finally decided to create my own undo-redo system using stacks.
Here's a quick overview of how I did it :
private const int InitialStackSize = 500;
private Stack<String> undoStack = new Stack<String>(InitialStackSize);
private Stack<String> redoStack = new Stack<String>(InitialStackSize);
private void YourKeyPressEventHandler(...)
{
// The user pressed on CTRL - Z, execute an "Undo"
if (e.KeyChar == 26)
{
// Save the cursor's position
int selectionStartBackup = SelectionStart;
redoStack.Push(Text);
Text = undoStack.Pop();
// Restore the cursor's position
SelectionStart = selectionStartBackup;
}
// The user pressed on CTRL - Y, execute a "Redo"
if (e.KeyChar == 25)
{
if (redoStack.Count <= 0)
return;
// Save the cursor's position
int selectionStartBackup = SelectionStart + redoStack.ElementAt(redoStack.Count - 1).Length;
undoStack.Push(Text);
Text = redoStack.Pop();
// Restore the cursor's position
SelectionStart = selectionStartBackup;
return;
}
undoStack.Push(Text);
SelectedText = e.KeyChar.ToString();
}
It's just an idea but what if you set the caret position to where you would insert your text and instead of modifying the Text property, just send the keys?
SendKeys.Send("The keys I want to send");
There are bound to be quirks but as I said, it's just an idea.
You can use TestBox.Paste. The documentation in the class overview, saying "Sets the selected text to the specified text without clearing the undo buffer.", seems confusing. I have just tried it and it sets the Undo as expected.
Is spite of its name it has no relation to Clipboard at all, it just replaces the currently selected text with the text you provide as an argument, and therefore seems just to do what the question asks for, in very simple manner.