I Want to display POPUP specific position of RichTextBox in WPF . i have understood that there is a way to get the same in winforms RichTextBox with following lines of code.
Point point = richTextBox1.GetPositionFromCharIndex(richTextBox1.SelectionStart);
I suppose it depends on when and what you are popping up. An example from MSDN shows how to position a ContextMenu with the location of the selected text within a RichTextBox control.
How to: Position a Custom Context Menu in a RichTextBox
The interesting bit would be the code below:
TextPointer position = rtb.Selection.End;
if (position == null) return;
Rect positionRect = position.GetCharacterRect(LogicalDirection.Forward);
contextMenu.HorizontalOffset = positionRect.X;
contextMenu.VerticalOffset = positionRect.Y;
This gets the relative position of the selection. If you are popping up a form you will need to translate that into a Window position.
This is a bit of code I used to test loading a popup window over the selected text in a RichTextBox. This also takes into account multiple monitors.
TextPointer tp = txtEditor.Selection.End;
if (tp == null) return;
Rect charRect = tp.GetCharacterRect(LogicalDirection.Forward);
Point winPoint = txtEditor.PointToScreen(charRect.TopRight);
Popup p = new Popup();
p.Left = winPoint.X;
p.Top = winPoint.Y;
p.Show();
UPDATE:
I did some additional research and found a MSDN Popup Placement Behavior article that is likely what you are looking for as far as Popup behavior. You can use the code I provided above with the selection or caret position of the RichTextBox to then determine the ultimate positioning of the Popup. I hope that helps.
static void tb_PreviewKeyDown(object sender, System.Windows.Input.KeyEventArgs e)
{
if (e.KeyStates == ((e.KeyStates ^ System.Windows.Input.KeyStates.Down)^System.Windows.Input.KeyStates.Down))
{
if (e.Key == System.Windows.Input.Key.OemPeriod)
{
TextBox tb = (TextBox)sender;
Rect r = tb.GetRectFromCharacterIndex(tb.CaretIndex, true);
Point p = tb.TransformToAncestor(tb).Transform(new Point(r.X, r.Y + 10));
p = tb.PointToScreen(p);
Rect rect = new Rect(p.X, p.Y, 0, 0);
Grid g = (Grid)Application.Current.MainWindow.Content;
System.Windows.Controls.Primitives.Popup popup = new System.Windows.Controls.Primitives.Popup();
popup.SetValue(System.Windows.Controls.Primitives.Popup.PlacementRectangleProperty, rect);
popup.IsOpen = true;
g.Children.Add(popup);}}}
Related
public partial class Form1 : Form
{
TextBox textBox;
public Form1()
{
InitializeComponent();
textBox = new TextBox() { Height = 30, Width = 200, Text = "Syncfusion Software", Font = new Font("Arial", 11) };
textBox.MouseMove += textBox_MouseMove;
this.Controls.Add(textBox);
}
void textBox_MouseMove(object sender, MouseEventArgs e)
{
var selectionStart = textBox.GetCharIndexFromPosition(e.Location);
textBox.SelectionStart = selectionStart;
textBox.SelectionLength = 0;
}
}
Here is my code, this is simple sample that i tried to get clear information about GetCharIndexFromPosition() method of TextBox.
In Mouse move, i get the char index position using the current mouse position of the textbox and set selection start of the textbox based on it. So that if i mouse move, then the selection start or caret position will be set based on the mouse move. But there was an issue with when mouse moved at the end of text, selection start is not set to last. it sets last but before.
For example, if a text box contains text "stack", then if mouse position is after the "k" then caret position should be at the end, but it displayed inbetween "c" and "k". GetCharIndexPosition() doesn't returns value properly for last character. Let me know solution for this
Thanks in Advance.
Regards,
Venkatesan R
This is a known documented behavior. The Remarks section of the GetCharIndexFromPosition method documentation contains the following Important note:
If the specified location is not within the client rectangle of the control, or is beyond the last character in the control, the return value is the index of the last character.
The workaround is to use the reverse method GetPositionFromCharIndex to adjust the returned index.
Something like this
void textBox_MouseMove(object sender, MouseEventArgs e)
{
var charIndex = textBox.GetCharIndexFromPosition(e.Location);
var charPosition = textBox.GetPositionFromCharIndex(charIndex);
if (e.Location.X > charPosition.X) charIndex++;
textBox.Select(charIndex, 0);
}
P.S. As a side note, I have no idea what this method is trying to achieve, but for sure it prevents the standard text selection by mouse behavior.
This ended up really bothering me, so I expanded Ivan Stoev's idea to a rather overengineered method that calculates the pixel width of the last character and divides it by two to accurately emulate the same behaviour as on the other characters.
The method was written for a drag/drop scenario, where the selection is adjusted to the drop position while hovering the mouse over.
// Cached, so it doesn't get recalculated on each moved pixel.
private Char _textBoxLastChar = '\0';
private Int32 _textBoxLastCharHalfWidth = 0;
private void TextBox_DragOver(object sender, DragEventArgs e)
{
if (!e.Data.GetDataPresent(DataFormats.UnicodeText))
return;
TextBox tb = sender as TextBox;
if (tb == null)
return;
Int32 textLen = tb.Text.Length;
if (textLen > 0 && _textBoxLastChar != tb.Text[textLen - 1])
{
_textBoxLastChar = tb.Text[textLen - 1];
_textBoxLastCharHalfWidth = (Int32)Math.Round(GetStringWidth(_textBoxLastChar.ToString(), tb.Font) / 2);
}
Point localPoint = tb.PointToClient(new Point(e.X, e.Y));
Int32 index = tb.GetCharIndexFromPosition(localPoint);
// fix for fact it returns the last char position when you go outside text bounds.
Int32 charPosition = tb.GetPositionFromCharIndex(index).X;
if (textLen != 0 && index == textLen - 1 && localPoint.X > charPosition + _textBoxLastCharHalfWidth)
index++;
if (!tb.Focused)
tb.Focus();
tb.SelectionStart = index;
tb.SelectionLength = 0;
}
public static Double GetStringWidth(String text, Font f)
{
//create a bmp / graphic to use MeasureString on
Single areaSize = f.Size * 20;
using (Bitmap b = new Bitmap(1, 1))
using (Graphics g = Graphics.FromImage(b))
{
SizeF sizeOfString = g.MeasureString(text, f, new SizeF(areaSize, areaSize), StringFormat.GenericTypographic);
return sizeOfString.Width;
}
}
Of course, if you ever change the font or font size of the text box, you'll have to reset _textBoxLastChar back to '\0'.
how can I change the font for a currently selected text area inside a WPF RichTextBox?
I've implemented a toolbar that can change the font size, family, color, etc. What i found is the details can be tricky with the wpf richtextbox. Setting the selection font makes some sense, but, there are also the default font properties of the text box, and the current caret properties to contend with. Here is what i've written to get it to work for most cases with the font size. The process should be the same for fontfamily and fontcolor. Hope it helps.
public static void SetFontSize(RichTextBox target, double value)
{
// Make sure we have a richtextbox.
if (target == null)
return;
// Make sure we have a selection. Should have one even if there is no text selected.
if (target.Selection != null)
{
// Check whether there is text selected or just sitting at cursor
if (target.Selection.IsEmpty)
{
// Check to see if we are at the start of the textbox and nothing has been added yet
if (target.Selection.Start.Paragraph == null)
{
// Add a new paragraph object to the richtextbox with the fontsize
Paragraph p = new Paragraph();
p.FontSize = value;
target.Document.Blocks.Add(p);
}
else
{
// Get current position of cursor
TextPointer curCaret = target.CaretPosition;
// Get the current block object that the cursor is in
Block curBlock = target.Document.Blocks.Where
(x => x.ContentStart.CompareTo(curCaret) == -1 && x.ContentEnd.CompareTo(curCaret) == 1).FirstOrDefault();
if (curBlock != null)
{
Paragraph curParagraph = curBlock as Paragraph;
// Create a new run object with the fontsize, and add it to the current block
Run newRun = new Run();
newRun.FontSize = value;
curParagraph.Inlines.Add(newRun);
// Reset the cursor into the new block.
// If we don't do this, the font size will default again when you start typing.
target.CaretPosition = newRun.ElementStart;
}
}
}
else // There is selected text, so change the fontsize of the selection
{
TextRange selectionTextRange = new TextRange(target.Selection.Start, target.Selection.End);
selectionTextRange.ApplyPropertyValue(TextElement.FontSizeProperty, value);
}
}
// Reset the focus onto the richtextbox after selecting the font in a toolbar etc
target.Focus();
}
How about something like:
TextSelection text = richTextBox.Selection;
if (!text.IsEmpty)
{
text.ApplyPropertyValue(RichTextBox.FontSizeProperty, value);
}
Solved...
if (this.TextEditor.Selection.IsEmpty)
this.TextEditor.CurrentFontFamily = SelectedFont;
else
this.TextEditor.Selection.ApplyPropertyValue(TextElement.FontFamilyProperty, SelectedFont);
To get the current selection use:
Dim rng As TextRange = New TextRange(YourRtfBox.Selection.Start, YourRtfBox.Selection.End)
And then set the fontstyle:
rng.ApplyPropertyValue(Inline.FontSizeProperty, YourFontSizeValue)
rng.ApplyPropertyValue(Inline.FontFamilyProperty, YourFontFamilyValue)
To change the font family for a selection in the RichTextBox you should use this:
text.ApplyPropertyValue(Run.FontFamilyProperty, value);
The selected text in a RichTextBox is a Run object, so one must use the Run Dependency Properties.
This seems to work in Silverlight at least, so should be the same thing in WPF.
I've got a custom (and getting complex) TabControl. It's a gathering of many sources, plus my own wanted features. In it is a custom Panel to show the headers of the TabControl. Its features are to compress the size of the TabItems until they reached their minimum, and then activates scrolling features (in the Panel, again). There is also another custom panel to hold a single button, that renders on the right of the TabItems (it's a "new tab" button).
It all works great, until I try to animate the scrolling.
Here are some relevant snippets :
In the CustomTabPanel (C#, overriding Panel and implementing IScrollInfo):
private readonly TranslateTransform _translateTransform = new TranslateTransform();
public void LineLeft()
{
FirstVisibleIndex++;
var offset = HorizontalOffset + _childRects[0].Width;
if (offset < 0 || _viewPort.Width >= _extent.Width)
offset = 0;
else
{
if (offset + _viewPort.Width > _extent.Width)
offset = _extent.Width - _viewPort.Width;
}
_offset.X = offset;
if (_scrollOwner != null)
_scrollOwner.InvalidateScrollInfo();
//Animate the new offset
var aScrollAnimation = new DoubleAnimation(_translateTransform.X, -offset,
new Duration(this.AnimationTimeSpan), FillBehavior.HoldEnd) { AccelerationRatio = 0.5, DecelerationRatio = 0.5 };
aScrollAnimation.Completed += ScrollAnimationCompleted;
_translateTransform.BeginAnimation(TranslateTransform.XProperty, aScrollAnimation , HandoffBehavior.SnapshotAndReplace);
//End of animation
// These lines are the only ones needed if we remove the animation
//_translateTransform.X = -offset;
//InvalidateMeasure();
}
void ScrollAnimationCompleted(object sender, EventArgs e)
{
InvalidateMeasure();
}
the _translateTransform is initialized in the constructor :
base.RenderTransform = _translateTransform;
Again, everything is fine if I remove the animation part and just replace it with the commented out lines at the end.
I must also point out that the problem is NOT with the animation itself. That part works out well. The problem is about when I remove some tab items : all the layout then screws up. The TranslateTransformation seems to hold on some wrong value, or something.
Thanks in advance.
Well. As it's often the case, I kept working on the thing, and... answered myself.
Could still be useful for other people, so here was the catch. In the line :
var aScrollAnimation = new DoubleAnimation(_translateTransform.X, -offset, new Duration(this.AnimationTimeSpan), FillBehavior.HoldEnd)
{ AccelerationRatio = 0.5, DecelerationRatio = 0.5 };
the FillBehavior should have been FillBehavior.Stop.
As easy as that!
how can I change the font for a currently selected text area inside a WPF RichTextBox?
I've implemented a toolbar that can change the font size, family, color, etc. What i found is the details can be tricky with the wpf richtextbox. Setting the selection font makes some sense, but, there are also the default font properties of the text box, and the current caret properties to contend with. Here is what i've written to get it to work for most cases with the font size. The process should be the same for fontfamily and fontcolor. Hope it helps.
public static void SetFontSize(RichTextBox target, double value)
{
// Make sure we have a richtextbox.
if (target == null)
return;
// Make sure we have a selection. Should have one even if there is no text selected.
if (target.Selection != null)
{
// Check whether there is text selected or just sitting at cursor
if (target.Selection.IsEmpty)
{
// Check to see if we are at the start of the textbox and nothing has been added yet
if (target.Selection.Start.Paragraph == null)
{
// Add a new paragraph object to the richtextbox with the fontsize
Paragraph p = new Paragraph();
p.FontSize = value;
target.Document.Blocks.Add(p);
}
else
{
// Get current position of cursor
TextPointer curCaret = target.CaretPosition;
// Get the current block object that the cursor is in
Block curBlock = target.Document.Blocks.Where
(x => x.ContentStart.CompareTo(curCaret) == -1 && x.ContentEnd.CompareTo(curCaret) == 1).FirstOrDefault();
if (curBlock != null)
{
Paragraph curParagraph = curBlock as Paragraph;
// Create a new run object with the fontsize, and add it to the current block
Run newRun = new Run();
newRun.FontSize = value;
curParagraph.Inlines.Add(newRun);
// Reset the cursor into the new block.
// If we don't do this, the font size will default again when you start typing.
target.CaretPosition = newRun.ElementStart;
}
}
}
else // There is selected text, so change the fontsize of the selection
{
TextRange selectionTextRange = new TextRange(target.Selection.Start, target.Selection.End);
selectionTextRange.ApplyPropertyValue(TextElement.FontSizeProperty, value);
}
}
// Reset the focus onto the richtextbox after selecting the font in a toolbar etc
target.Focus();
}
How about something like:
TextSelection text = richTextBox.Selection;
if (!text.IsEmpty)
{
text.ApplyPropertyValue(RichTextBox.FontSizeProperty, value);
}
Solved...
if (this.TextEditor.Selection.IsEmpty)
this.TextEditor.CurrentFontFamily = SelectedFont;
else
this.TextEditor.Selection.ApplyPropertyValue(TextElement.FontFamilyProperty, SelectedFont);
To get the current selection use:
Dim rng As TextRange = New TextRange(YourRtfBox.Selection.Start, YourRtfBox.Selection.End)
And then set the fontstyle:
rng.ApplyPropertyValue(Inline.FontSizeProperty, YourFontSizeValue)
rng.ApplyPropertyValue(Inline.FontFamilyProperty, YourFontFamilyValue)
To change the font family for a selection in the RichTextBox you should use this:
text.ApplyPropertyValue(Run.FontFamilyProperty, value);
The selected text in a RichTextBox is a Run object, so one must use the Run Dependency Properties.
This seems to work in Silverlight at least, so should be the same thing in WPF.
I am trying to position an Adorner depending on the dimensions of the parent of the adorned element. For example, I have a textbox. I want to adorn this textbox so it looks something like this:
how the adorner needs to be placed http://img707.imageshack.us/img707/9840/fig1.png
A textbox is placed in a canvas object and if there is enough space available then place the adorner (semi transparent rounded square) in line with the bottom edge of the textbox. The adorner is initiated when the user clicks on the textbox.
Currently the canvas and its contents (the textbox) is hosted in a WinForms form - so the WPF is handled by the ElementHost control.
But when I run my code, when the textbox is clicked for the first time it displays the adorner aligned to the top edge of the textbox (see figure below). After that it positions itself correctly (like the figure above) Does anyone know why this might be?
how adorner is positions http://img14.imageshack.us/img14/4766/fig2v.png
I have pasted the code for this below:
TextBoxAdorner.cs - this the adorner logic
public class TextBoxAdorner : Adorner
{
private TextBox _adornedElement;
private VisualCollection _visualChildren;
private Rectangle _shape;
private Canvas _container;
private Canvas _parentCanvas;
public TextBoxAdorner(UIElement adornedElement, Canvas parentCanvas)
: base(adornedElement)
{
_adornedElement = (TextBox)adornedElement;
_parentCanvas = parentCanvas;
_visualChildren = new VisualCollection(this);
_container = new Canvas();
_shape = new Rectangle();
_shape.Width = 100;
_shape.Height = 80;
_shape.Fill = Brushes.Blue;
_shape.Opacity = 0.5;
_container.Children.Add(_shape);
_visualChildren.Add(_container);
}
protected override Size ArrangeOverride(Size finalSize)
{
Point location = GetLocation();
_container.Arrange(new Rect(location, finalSize));
return finalSize;
}
private Point GetLocation()
{
if (_parentCanvas == null)
return new Point(0, 0);
Point translate;
double xloc = 0, yloc = _shape.Height - _adornedElement.ActualHeight;
if (yloc < 0) // textbox is bigger than the shape
yloc = 0;
else
{
translate = this.TranslatePoint(new Point(0, -yloc), _parentCanvas);
// coordinate is beyond the position of the parent canvas
if (translate.Y < 0) // this is true the first time it's run
yloc = 0;
else
yloc = -yloc;
}
translate = this.TranslatePoint(new Point(_shape.Width, 0), _parentCanvas);
// textbox is in right edge of the canvas
if (translate.X > _parentCanvas.ActualWidth)
{
double pos = translate.X - _parentCanvas.ActualWidth;
translate = this.TranslatePoint(new Point(-pos,0), _parentCanvas);
if (translate.X < 0)
xloc = 0;
else
xloc = translate.X;
}
return new Point(xloc, yloc);
}
protected override Size MeasureOverride(Size constraint)
{
Size myConstraint = new Size(_shape.Width, _shape.Height);
_container.Measure(myConstraint);
return _container.DesiredSize;
}
protected override Visual GetVisualChild(int index)
{
return _visualChildren[index];
}
protected override int VisualChildrenCount
{
get
{
return _visualChildren.Count;
}
}
}
The position of an Adorner is relative to the adorned element. If you want it to be to the top of your object, the value of yloc should be negative. However, the code you have also regards the boundaries of the Canvas. If there's not enough place for the rectangle above, it would put it below. Trying placing the TextBox a little lower in the Canvas.