e.OriginalSource返回错误信息
本文关键字：信息 错误 返回 OriginalSource | 更新日期: 2023-09-27 18:01:08
我正在制作一个自定义滑块，它是自定义控件(颜色选择器(的一部分。RGBA使用了4次滑块，当其中一个滑块发生变化时，我需要更新颜色选择器其他部分的颜色(其他自定义控件，如HueWheel等(。
ColorSlider类：
public class ColorSlider : Slider
{
static ColorSlider()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(ColorSlider), new FrameworkPropertyMetadata(typeof(ColorSlider)));
}
public Color LeftColor
{
get { return (Color)GetValue(LeftColorProperty); }
set { SetValue(LeftColorProperty, value); }
}
public static readonly DependencyProperty LeftColorProperty =
DependencyProperty.Register("LeftColor", typeof(Color), typeof(ColorSlider), new UIPropertyMetadata(Colors.Black));
public Color RightColor
{
get { return (Color)GetValue(RightColorProperty); }
set { SetValue(RightColorProperty, value); }
}
public static readonly DependencyProperty RightColorProperty =
DependencyProperty.Register("RightColor", typeof(Color), typeof(ColorSlider), new UIPropertyMetadata(Colors.White));
private bool _isPressed = false;
private Slider _PART_Slider;
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
_PART_Slider = (Slider)GetTemplateChild("PART_Slider");
_PART_Slider.ApplyTemplate();
}
protected override void OnPreviewMouseLeftButtonDown(MouseButtonEventArgs e)
{
base.OnPreviewMouseLeftButtonDown(e);
_isPressed = true;
if (_isPressed)
{
Point position = e.GetPosition(_PART_Slider);
double d = 1.0d / _PART_Slider.ActualWidth * position.X;
var p = _PART_Slider.Maximum * d;
_PART_Slider.Value = p;
}
e.Handled = true;
}
protected override void OnPreviewMouseLeftButtonUp(MouseButtonEventArgs e)
{
base.OnPreviewMouseLeftButtonUp(e);
_isPressed = false;
}
protected override void OnMouseMove(MouseEventArgs e)
{
if (_isPressed)
{
Point position = e.GetPosition(_PART_Slider);
double d = 1.0d / _PART_Slider.ActualWidth * position.X;
var p = _PART_Slider.Maximum * d;
_PART_Slider.Value = p;
}
}
}
及其XAML：
<Style TargetType="{x:Type local:ColorSlider}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type local:ColorSlider}">
<Border>
<Border.Background>
<LinearGradientBrush StartPoint="0,0" EndPoint="1,0">
<GradientStop Color="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=LeftColor}" Offset="0"/>
<GradientStop Color="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=RightColor}" Offset="1"/>
</LinearGradientBrush>
</Border.Background>
<Slider x:Name="PART_Slider" Maximum="255">
<Slider.Template>
<ControlTemplate>
<Grid x:Name="Part_Grid">
<Track Grid.Row="1" Margin="-3,0,-2,0" x:Name="PART_Track" >
<Track.DecreaseRepeatButton>
<RepeatButton Style="{StaticResource ColorPickerRepeatButtonStyle}"
Command="{x:Static Slider.DecreaseLarge}" />
</Track.DecreaseRepeatButton>
<Track.IncreaseRepeatButton>
<RepeatButton Style="{StaticResource ColorPickerRepeatButtonStyle}"
Command="{x:Static Slider.IncreaseLarge}" />
</Track.IncreaseRepeatButton>
<Track.Thumb>
<Thumb x:Name="Part_Thumb" Style="{StaticResource ColorSliderThumbStyle}">
<Thumb.RenderTransform>
<TranslateTransform Y="5"/>
</Thumb.RenderTransform>
</Thumb>
</Track.Thumb>
</Track>
</Grid>
</ControlTemplate>
</Slider.Template>
</Slider>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
在我的颜色选择器类中，如果其中一个滑块发生变化，我会尝试更新颜色：
private void OnSliderValueChanged(RoutedPropertyChangedEventArgs<double> e)
{
// Avoid endless loop
if (m_withinChange)
return;
m_withinChange = true;
Console.WriteLine(e.OriginalSource);
if (e.OriginalSource == m_redColorSlider ||
e.OriginalSource == m_greenColorSlider ||
e.OriginalSource == m_blueColorSlider ||
e.OriginalSource == m_alphaColorSlider)
{
Color newColor = GetRgbColor();
UpdateHsvControlColor(newColor);
UpdateSelectedColor(newColor);
}
else if (e.OriginalSource == m_hueWheel)
{
double hue = m_hueWheel.Hue;
UpdateHsvControlHue(hue);
Color newColor = GetHsvColor();
UpdateRgbColors(newColor);
UpdateSelectedColor(newColor);
}
m_withinChange = false;
}
private static void OnSliderValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
{
ColorPicker colorPicker = (ColorPicker)sender;
colorPicker.OnSliderValueChanged(e);
}
问题是，条件e.OriginalSource == m_redColorSlider永远不会为真，因此颜色永远不会更新。事实上，如果我执行Console.WriteLine(e.OriginalSource)，控制台会显示"System.Windows.Controls.Slider"，而不是类似"ColorPicker.ColorSlider"的内容。但是，我制作的另一个控件HueWheel(另一个类中的圆形滑块(在这种情况下工作正常，但找不到区别。。。
知道吗？
谢谢
编辑---
这里有一个下载这个小项目的链接：ColorPicker
由于我完全是CustomControl编程的初学者，也许我错过了对这个问题的一些解释。
问题在您的Slider Control中不要在另一个Slider中嵌套Slider
XAML
<Style TargetType="{x:Type local:ColorSlider}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type local:ColorSlider}">
<Border>
<Border.Background>
<LinearGradientBrush StartPoint="0,0" EndPoint="1,0">
<GradientStop Color="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=LeftColor}" Offset="0"/>
<GradientStop Color="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=RightColor}" Offset="1"/>
</LinearGradientBrush>
</Border.Background>
<Grid x:Name="Part_Grid">
<Track Grid.Row="1" Margin="-3,0,-2,0" x:Name="PART_Track" >
<Track.DecreaseRepeatButton>
<RepeatButton Style="{StaticResource ColorPickerRepeatButtonStyle}"
Command="{x:Static Slider.DecreaseLarge}" />
</Track.DecreaseRepeatButton>
<Track.IncreaseRepeatButton>
<RepeatButton Style="{StaticResource ColorPickerRepeatButtonStyle}"
Command="{x:Static Slider.IncreaseLarge}" />
</Track.IncreaseRepeatButton>
<Track.Thumb>
<Thumb x:Name="Part_Thumb" Style="{StaticResource ColorSliderThumbStyle}">
<Thumb.RenderTransform>
<TranslateTransform Y="5"/>
</Thumb.RenderTransform>
</Thumb>
</Track.Thumb>
</Track>
</Grid>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
代码
public class ColorSlider : Slider {
static ColorSlider() {
DefaultStyleKeyProperty.OverrideMetadata(typeof(ColorSlider), new FrameworkPropertyMetadata(typeof(ColorSlider)));
}
#region Dependency Properties
public Color LeftColor {
get { return (Color) GetValue(LeftColorProperty); }
set { SetValue(LeftColorProperty, value); }
}
public static readonly DependencyProperty LeftColorProperty =
DependencyProperty.Register("LeftColor", typeof(Color), typeof(ColorSlider), new UIPropertyMetadata(Colors.Black));
public Color RightColor {
get { return (Color) GetValue(RightColorProperty); }
set { SetValue(RightColorProperty, value); }
}
public static readonly DependencyProperty RightColorProperty =
DependencyProperty.Register("RightColor", typeof(Color), typeof(ColorSlider), new UIPropertyMetadata(Colors.White));
#endregion
private bool _isPressed = false;
protected override void OnPreviewMouseLeftButtonDown(MouseButtonEventArgs e) {
base.OnPreviewMouseLeftButtonDown(e);
_isPressed = true;
if (_isPressed) {
Point position = e.GetPosition(this);
double d = 1.0d / this.ActualWidth * position.X;
var p = this.Maximum * d;
this.Value = p;
}
e.Handled = true;
}
protected override void OnPreviewMouseLeftButtonUp(MouseButtonEventArgs e) {
base.OnPreviewMouseLeftButtonUp(e);
_isPressed = false;
}
protected override void OnMouseMove(MouseEventArgs e) {
if (_isPressed) {
Point position = e.GetPosition(this);
double d = 1.0d / this.ActualWidth * position.X;
var p = this.Maximum * d;
this.Value = p;
}
}
}
由于您已经继承了滑块，所以您不必在自己的内部放置另一个滑块。
对于许可：你的实际控制没有发射任何事件。嵌套滑块完成
干杯