public sealed class HintComboBox : ComboBox
{
#region Consts
private const string WatermarkStatesGroupName = "WatermarkStates";
private const string WatermarkVisibleStateName = "WatermarkVisible";
private const string TextBoxVisibleStateName = "TextBoxVisible";
private const string WatermarkHiddenStateName = "WatermarkHidden";
private const string EditTextBoxName = "InTextBox";
private const string ComboBoxName = "InComboBox";
private const string WatermarkTextBlockName = "HintTextBlock";
private const string PickButtonName = "PickButton";
// private const string WatermarkBlockStyleName = "WatermarkBlockStyle";
private const string TextBoxStyleName = "TextBoxStyle";
#endregion
#region 属性
/// <summary>
/// 可编辑
/// </summary>
public Boolean IsEditable = true;
/// <summary>
/// 可编辑输入 Text
/// </summary>
public string Text
{
get { return GetValue(TextProperty) as string; }
set { SetValue(TextProperty, value); }
}
public static readonly DependencyProperty TextProperty =
DependencyProperty.Register(
"Text",
typeof(string),
typeof(HintComboBox),
new PropertyMetadata(string.Empty));
/// <summary>
/// 水印
/// </summary>
public String HintText
{
get { return base.GetValue(HintProperty) as String; }
set { base.SetValue(HintProperty, value); }
}
public static readonly DependencyProperty HintProperty =
DependencyProperty.Register("HintText", typeof(String), typeof(HintComboBox), new PropertyMetadata("Type something...")
);
#endregion
#region 新加可操作子控件
private Button PickButton;
private TextBox EditBox;
#endregion
/// <summary>
/// 构造
/// </summary>
public HintComboBox()
{
this.DefaultStyleKey = typeof(HintComboBox);
}
protected override void OnApplyTemplate()
{
base.OnApplyTemplate();
PickButton = GetTemplateChild(PickButtonName) as Button;
if (PickButton != null)
{
PickButton.Click += OnPickButtonClick;
}
EditBox = GetTemplateChild(EditTextBoxName) as TextBox;
if (EditBox!=null)
{
EditBox.GotFocus += OnBoxGotFocus;
EditBox.LostFocus += OnBoxLostFocus;
EditBox.TextChanged += OnEditBoxTextChanged;
}
UpdateTextBoxVisualState(false, IsEditable);
}
#region Popup Event
private void OnPickButtonClick(object sender, RoutedEventArgs routedEventArgs)
{
UpdateTextBoxVisualState(false, false);
IsDropDownOpen = !IsDropDownOpen;
}
protected override void OnDropDownOpened(object e)
{
base.OnDropDownOpened(e);
//State Change
// UpdateVisualState(false, IsEditable);
}
protected override void OnDropDownClosed(object e)
{
base.OnDropDownClosed(e);
// UpdateVisualState(true, IsEditable);
}
#endregion
#region 焦点 Event
protected void OnEditBoxTextChanged(object sender, TextChangedEventArgs e)
{
TextBox pEditBox = sender as TextBox;
this.Text = pEditBox.Text;
}
protected void OnBoxGotFocus(object sender,RoutedEventArgs e)
{
// UpdateVisualState(true, IsEditable);
}
protected void OnBoxLostFocus(object sender, RoutedEventArgs e)
{
this.Text = EditBox.Text;
UpdateTextBoxVisualState(false, IsEditable);
}
protected override void OnGotFocus(RoutedEventArgs e)
{
// base.OnGotFocus(e);
UpdateTextBoxVisualState(true, IsEditable);
bool b = EditBox.Focus(FocusState.Programmatic);
}
protected override void OnLostFocus(RoutedEventArgs e)
{
base.OnLostFocus(e);
//UpdateVisualState(false, IsEditable);
}
#endregion
#region VisualState Event
/// <summary>
///
/// </summary>
/// <param name="isFocused">焦点</param>
/// <param name="isShow">是否显示输入项与水印</param>
private void UpdateTextBoxVisualState(bool isFocused, bool isShow = true)
{
if (!isShow)
{
VisualStateManager.GoToState(this, WatermarkHiddenStateName, true);
return;
}
if (!isFocused && string.IsNullOrEmpty(this.Text))
{
VisualStateManager.GoToState(this, WatermarkVisibleStateName, true);
}
else
{
VisualStateManager.GoToState(this, TextBoxVisibleStateName, true);
// bool b = EditBox.Focus(FocusState.Programmatic);
return;
}
}
#endregion
}
以上是我的逻辑处理代码，运行了没什么效果，还请指点下，还有就是哪里有比较好的自定义模版类的教程什么的！
带水印可输入的ComboBox控件，还请Bob指点下！
