After trying numerous methods to get watermarking to work for me, I finally found the one modified by @Beej on this page: Watermark / hint text / placeholder TextBox in WPF
I got it placed in my project, and it works fine, with one exception. I have multiple textboxes on each tab of a tabcontrol. At the bottom is a clear button that works to clear all the textboxes on the tab. The clear button works fine, the watermark works fine, but I can't get them to work together. The window loads with the watermarks in place, and pressing the clear button clears all the boxes, but the watermarks don't reappear until after I move through the textboxes (each one gaining and losing focus.) I have tried numerous ways to solve this, such as placing a method call to the ShowWatermark function in the button MouseUp event, but nothing has worked...Help?!
This is the Clear button method I'm using:
public void ClearTextBoxes()
{
ChildControls ccChildren = new ChildControls();
foreach (object o in ccChildren.GetChildren(rvraDockPanel, 2))
{
if (o.GetType() == typeof(TextBox))
{
TextBox txt = (TextBox)o;
txt.Text = "";
}
if (o.GetType() == typeof(DigitBox))
{
DigitBox digit = (DigitBox)o;
digit.Text = "";
}
if (o.GetType() == typeof(PhoneBox))
{
PhoneBox phone = (PhoneBox)o;
phone.Text = "";
}
if (o.GetType() == typeof(DateBox))
{
DateBox date = (DateBox)o;
date.Text = "";
}
if (o.GetType() == typeof(TextBoxWatermarked))
{
TextBoxWatermarked water = (TextBoxWatermarked)o;
water.Text = "";
}
}
}
class ChildControls
{
private List<object> listChildren;
public List<object> GetChildren(Visual p_vParent, int p_nLevel)
{
if (p_vParent == null)
{
throw new ArgumentNullException("Element {0} is null!", p_vParent.ToString());
}
this.listChildren = new List<object>();
this.GetChildControls(p_vParent, p_nLevel);
return this.listChildren;
}
private void GetChildControls(Visual p_vParent, int p_nLevel)
{
int nChildCount = VisualTreeHelper.GetChildrenCount(p_vParent);
for (int i = 0; i <= nChildCount - 1; i++)
{
Visual v = (Visual)VisualTreeHelper.GetChild(p_vParent, i);
listChildren.Add((object)v);
if (VisualTreeHelper.GetChildrenCount(v) > 0)
{
GetChildControls(v, p_nLevel + 1);
}
}
}
}
Both the ChildControls class and the TextboxWatermarked class (from the above link) are in seperate class files.
