public WatermarkAdorner(UIElement adornedElement) : base(adornedElement)
{
if (adornedElement is TextBox)
{
adornedTextBox = adornedElement as TextBox;
adornedTextBox.TextChanged += (s1, e1) =>
{
this.SetWatermarkVisible(true);
};
adornedTextBox.GotFocus += (s1, e1) => {
this.SetWatermarkVisible(true);
};
adornedTextBox.LostFocus += (s1, e1) =>
{
this.SetWatermarkVisible(false);
};
_visuals = new VisualCollection(this);
textBlock = new TextBlock()
{
HorizontalAlignment = System.Windows.HorizontalAlignment.Left,
VerticalAlignment = System.Windows.VerticalAlignment.Center,
Text = WatermarkAdorner.GetWatermark(adornedElement),
Foreground = new SolidColorBrush(Color.FromRgb(153, 153, 153)),
Margin = new Thickness(5, 0, 2, 0),
};
_visuals.Add(textBlock);
this.showModel = WatermarkAdorner.GetWatermarkShowMode(adornedElement);
}
this.IsHitTestVisible = false;
}
private static void WatermarkChangedCallBack(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
try
{
var element = d as FrameworkElement;
if (element != null)
{
var adornerLayer = AdornerLayer.GetAdornerLayer(element);
if (adornerLayer != null)
{
adornerLayer.Add(new WatermarkAdorner(element as UIElement));
}
else
{
//layer为null，说明还未load过（整个可视化树中没有装饰层的情况不考虑）
//在控件的loaded事件内生成装饰件
element.Loaded += (s1, e1) => {
var adorner = new WatermarkAdorner(element);
var v = AdornerLayer.GetAdornerLayer(element);
if (v != null)
{
v.Add(adorner);
}
};
}
}
}
catch (Exception)
{
}
}
private static void WatermarkChangedCallBack(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
try
{
var element = d as FrameworkElement;
if (element != null)
{
var adornerLayer = AdornerLayer.GetAdornerLayer(element);
if (adornerLayer != null)
{
adornerLayer.Add(new WatermarkAdorner(element as UIElement));
}
else
{
WatermarkAdorner adorner = null;
//增加Initialized事件处理是为了解决当水印放置在TabControl中时导致水印频繁的Loaded和Unload
element.Initialized += (o1, e1) =>
{
adorner = new WatermarkAdorner(element);
};
//layer为null，说明还未load过（整个可视化树中没有装饰层的情况不考虑）
//在控件的loaded事件内生成装饰件
element.Loaded += (s1, e1) =>
{
var v = AdornerLayer.GetAdornerLayer(element);
if (v != null && adorner != null)
{
v.Add(adorner);
}
};
element.Unloaded += (s1, e1) =>
{
var v = AdornerLayer.GetAdornerLayer(element);
if (v != null && adorner != null)
{
v.Remove(adorner);
}
};
}
}
}
catch (Exception)
{
}
}
public WatermarkAdorner(UIElement adornedElement) : base(adornedElement)
{
if (adornedElement is TextBox)
{
adornedTextBox = adornedElement as TextBox;
adornedTextBox.TextChanged += (s1, e1) =>
{
this.SetWatermarkVisible(true);
};
adornedTextBox.GotFocus += (s1, e1) =>
{
this.SetWatermarkVisible(true);
};
adornedTextBox.LostFocus += (s1, e1) =>
{
this.SetWatermarkVisible(false);
};
adornedTextBox.IsVisibleChanged += (o, e) =>
{
if (string.IsNullOrEmpty(this.adornedTextBox.Text))
{
this.textBlock.Visibility = (bool)e.NewValue ? Visibility.Visible : Visibility.Collapsed;
}
else
{
this.textBlock.Visibility = Visibility.Collapsed;
}
};
_visuals = new VisualCollection(this);
textBlock = new TextBlock()
{
HorizontalAlignment = adornedTextBox.HorizontalContentAlignment,
VerticalAlignment = adornedTextBox.VerticalContentAlignment,
Text = WatermarkAdorner.GetWatermark(adornedElement),
Foreground = new SolidColorBrush(Color.FromRgb(153, 153, 153)),
Margin = new Thickness(5, 0, 2, 0),
};
_visuals.Add(textBlock);
this.showModel = WatermarkAdorner.GetWatermarkShowMode(adornedElement);
}
this.IsHitTestVisible = false;
}
