How to get the actualWidth after hide the TextBlock in Icon1 ?
Why both Width1 and Width2 are Same after hide the Label? I want the ActualWidth of the Icon1 after Hide the TextBlock(Label).
I need to do some action after changing the visibility based on ActualWidth!!
I also have one more question . i.e., Before hiding the visibility of label ,is there any way to determine the actualWidth(What will be the Width of Icon1 by Hiding label) of Icon1 ??
My Complete Project Link.
Why both Width1 and Width2 are Same after hide the Label?
If you print Width2 with debug writeline, you will find it will update when next SizeChanged, the problem is you get Width2 value before UI update, it will return previous value. please set a task delay before width2, you will get updated value 46.
await Task.Delay(100);
double width2 = icon1.ActualWidth;
Before hiding the visibility of label ,is there any way to determine the actualWidth.
As you mentioned above you could call ActualWidth property to return Width value.
Update
bool isResize; //set it as true after Label hidden.
private void Icon1_SizeChanged(object sender, SizeChangedEventArgs e)
{
if (isResize)
{
var newSize = e.NewSize;
// do your action here.
}
}
First off, the title might not make much sense. Suggestions for changing it are appreciated.
I am clicking into a TextBox that is inside a ScrollViewer. When that happens, the ScrollViewer will shrink in height (from the bottom up), it doesn't scroll at all, and some controls near the bottom of the viewport get covered up (cause the viewport is now smaller). If the TextBox gets covered up, I need to scroll such that it is still visible.
I have checked several SO questions, and none seem to capture my problem. This one is close, but I don't have a canvas to work with. Also, given my specific scenario, I cannot use Dispatcher to wait for the UI to load, and then use BringIntoView().
The TextBox's share an event, TextBox_GotFocus,
TextBox_GotFocus(object sender, RoutedEventArgs e)
{
myScrollViewer.Height = 400; //used to be 600
//if sender was in the 401-600 range, bring it into view
}
How do I scroll the ScrollViewer only if the entered TextBox is now hidden after the height change?
No thanks to the random downvote, but I managed to figure a roundabout way to do this.
TextBox_GotFocus(object sender, RoutedEventArgs e)
{
FrameworkElement element = sender as FrameworkElement;
//Get the distance from the top and bottom of the ScrollViewer
double offsetTop = element.TranslatePoint(new Point(), myScrollViewer).Y;
double offsetBottom = myScrollViewer.Height - offsetTop;
//Get total height needed to show the whole element
double height = 200 + element.Height;
//If the control would be hidden...
if (offsetBottom < height)
{
//Scroll down the difference
double change = myScrollViewer.VerticalOffset + (height - offsetBottom);
myScrollViewer.ScrollToVerticalOffset(change);
}
myScrollViewer.Height = 400; //used to be 600
}
I am trying to get the Width of a StackPanel. I tried:
double width = stk_main.ActualWidth;
which gave zero and it shouldnt be. Also:
double width = stk_main.Width;
which gives NaN because width set to auto previously. So how can I get the width?
You can use sizeChanged, but it doesn't work when the stack panel you used not change size.
private void stk_main_SizeChanged(object sender, SizeChangedEventArgs e)
{
double yourWidthNow = e.NewSize.Width;
}
Hope it can give you some help...
You could attach to the Loaded event of the StackPanel as the layout pass will have completed by this point and the ActualWidth will be set.
I'm writing a program where the user should be able to write text in a TextBox. I'd like the TextBox to resize itself, so it fits to the content.
I've tried the following:
private void textBoxTitle_TextChanged(object sender, TextChangedEventArgs e)
{
System.Drawing.Font myFont = new System.Drawing.Font("Verdana", 8);
System.Drawing.SizeF mySize = e.Graphics.MeasureString("This is a test", myFont);
this.textBoxTitle.Width = (int)Math.Round(mySize.Width, 0);
}
I get an error saying that Graphics doesn't work for TextChangedEventArgs. Is there another way I can resize the TextBox?
You should try a code something like below. It has worked for me well.
private void textBox1_TextChanged(object sender, EventArgs e)
{
Size size = TextRenderer.MeasureText(textBox1.Text, textBox1.Font);
textBox1.Width = size.Width;
textBox1.Height = size.Height;
}
For more information refer to TextRenderer.MeasureText()
I am adding this answer as I do not see the fixed width aspect of a textbox being discussed in any of the other. If you have a fixed width for your textbox, and you want to adjust only its height you can do something like the following:
Something like this gives the height of the text as how it is drawn in the multiline wordwrapped textbox itself:
SizeF MessageSize = MyTextBoxControl.CreateGraphics()
.MeasureString(MyTextBoxControl.Text,
MyTextBoxControl.Font,
MyTextBoxControl.Width,
new StringFormat(0));
I am not sure what StringFormat should be but the values StringFormatFlags do not seem to apply to a default TextBox make up.
Now with MessageSize.Height you know the height of the text in the textbox.
I had the same problem and I solved it in a simpler way.
I used the AutoSize property of a Label control.. I added an invisible label to my form, set its AutoSize property True. When the I need to change the size of my TextBox I use this code:
MyLabel.Text = MyTextBox.Text;
MyTextBox.Size = MyLabel.Size;
I set the Maximum and Minimum Size of the label for better results.
Have Fun
Your binding to the wrong event, and you cannot use the graphics object in the TextChangedEventArgs object.
Try using the TextChanged event. The following snippet is working:
public Form1()
{
InitializeComponent();
this.textBox1.TextChanged += new EventHandler(textBox1_TextChanged);
}
void textBox1_TextChanged(object sender, EventArgs e)
{
System.Drawing.SizeF mySize = new System.Drawing.SizeF();
// Use the textbox font
System.Drawing.Font myFont = textBox1.Font;
using (Graphics g = this.CreateGraphics())
{
// Get the size given the string and the font
mySize = g.MeasureString(textBox1.Text, myFont);
}
// Resize the textbox
this.textBox1.Width = (int)Math.Round(mySize.Width, 0);
}
}
first, create method to Make the TextBox fit its contents.
private void AutoSizeTextBox(TextBox txt)
{
const int x_margin = 0;
const int y_margin = 2;
Size size = TextRenderer.MeasureText(txt.Text, txt.Font);
txt.ClientSize =
new Size(size.Width + x_margin, size.Height + y_margin);
}
then with the TextChanged event handler calls AutoSizeTextBox() function to make the TextBox fit its text when the text changes.
private void txtContents_TextChanged(object sender, EventArgs e)
{
AutoSizeTextBox(sender as TextBox);
}
That’s all, for more info:
resize-a-textbox-to-fit-its-text
You will need to use the CreateGraphics() method of the form to create the Graphics instance to measure the string on.
The TextChangedEventArgs class does not have a Graphics property, that is a property of the PaintEventArgs class passed in to the Paint event handler
Try this:
using System.Drawing;
...
private void textBoxTitle_TextChanged(object sender, TextChangedEventArgs e)
{
// Determine the correct size for the text box based on its text length
// get the current text box safely
TextBox tb = sender as TextBox;
if (tb == null) return;
SizeF stringSize;
// create a graphics object for this form
using(Graphics gfx = this.CreateGraphics())
{
// Get the size given the string and the font
stringSize = gfx.MeasureString(tb.Text, tb.Font);
}
// Resize the textbox
tb.Width = (int)Math.Round(stringSize.Width, 0);
}
Essentially you create your own Graphics object for the form, then measure it based on the text and font of the TextBox. The using will properly dispose the Graphics object - your previous code would have leaked horribly!
Whatever the aim is.
If the size of the textbox should be dynamically set up based on the string, which should be the text inside this box, there is no nice option.
Reasons : MeasureString uses usual string formatters as delimiters for its own width and height.
Means, carriage return and line feed are parsed, too. Resulting in a sizeF.Width and sizeF.Height.
Depending on the string( and its font and number of lines ) these both variables can carry values, which are sometimes useless to be used as width/height values of a textbox ( because they can be bigger than the parentform's values and this would resize the textbox to a size, with left and bottom borders beyond those of the parent form).
Some solutions are still available, depending on the aim, one would like to achieve.
One idea would be :
Create a textbox in designer, size = 100 X 100. enable word-wrapping.
In the OnTextChanged event handler of the textbox, we just resize the textbox's width to a value, defined by ourself (e.g. parentform.Width or another hard value ).
This would cause the word wrap to recalculate the string in the textbox and this would rearrange all the characters inside the textbox, because word wrap is enabled.
The height of the textbox could can be set hard to parentform.Height, for example.
BUT,
better : set the height dynamically,based on the Y value of the ReturnValue (Point) of the method texbox.GetPositionFromCharIndex(textbox.TextLength -1 ).
Then, with Math.Min() determine, which is smaller ( either parentform.Height or Point.Y ) , and reset the textbox size to new Size(previousDeterminedWidth, nowDeterminedHeight).
Please keep in mind ( if scrollbars are enabled ) to add about 17 pixs to Your width calculation.
Best regards
Did you try to set yourTextBox.AutoSize = true;?
This property may be hidden in the GUI designer, but you can set it in the form constructor right after InitializeComponent(); call.
Graphics.Measure string you can do o PaintEventArgs, not on TextChangedEventArgs
What I think you want is this
System.Drawing.Font myFont = new System.Drawing.Font("Verdana", 8);
Graphics graphics = this.CreateGraphics();
SizeF textSize = graphics.MeasureString("This is a test", myFont);
The problem is that you just cannot create a Graphics object by simply allocating it since it has no public constructor, so you should better go and use TextRenderer.MeasureText, as done in http://msdn.microsoft.com/en-us/library/y4xdbe66.aspx
TextRenderer is less accurate because it uses GDI and Graphics uses GDI+, so maybe you should leave a little margin on the value you get from the Width property.
Hope this helps
I need to allow a long label to be scrolled through on it's own. I do not want a text-box of any sort. I would like to be able to format the text inside. It definitely needs to scroll own its own, not with the window. I have added a scrollbar successfully, but I have no idea how to begin to use it's event/s.
thanks
i tried using a panel? I will again, perhaps I made an error.
:: yeah I tried that again, it simply cuts off my label.
Place the label inside a Panel and set AutoScroll to true.
Add a label (here label1) and a scrollbar (here hScrollBar1) and deal with the event in this fashion (assuming hScrollBar1.Maximum = 100 and hScrollBar1.Minimum = 0):
private void hScrollBar1_Scroll(object sender, ScrollEventArgs e)
{
const int labellength = 10;
String thetext = "Ozzie ozzie ozzie! OI OI OI! And then some...";
int offset = (int)((double)e.NewValue / 100 * (thetext.Length - labellength));
label1.Text = thetext.Substring(offset, labellength);
}
Naturally you would have to specify the 'amount' of text to appear in the label by changing labellength. If you find that you can not scroll to the very end, lower hScrollBar1.LargeChange to 1.