WPF中有中心点的slider滑动条
想要实现的效果原生滑动条
需要认识一下滑动条的组成
[*]在原生控件中生成“资源字典”对应的样式
[*]然后在track所在的列进行添砖加瓦
[*]由于track在row="1"的位置，只需要在这个位置上面添加一个Ellipse和Line
[*]Ellipse是来描述固定在滑动条上的中心点的位置
[*]line是来描述Thumb从中心点移动到其他位置显示的颜色
具体的自定样式修改
SliderHorizontal样式
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" MinHeight="{TemplateBinding MinHeight}" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<TickBar
x:Name="TopTick"
Grid.Row="0"
Height="4"
Margin="0,0,0,2"
Fill="{TemplateBinding Foreground}"
Placement="Top"
Visibility="Collapsed" />
<TickBar
x:Name="BottomTick"
Grid.Row="2"
Height="4"
Margin="0,2,0,0"
Fill="{TemplateBinding Foreground}"
Placement="Bottom"
Visibility="Collapsed" />
<Border
x:Name="TrackBackground"
Grid.Row="1"
Height="4.0"
Margin="5,0"
VerticalAlignment="center"
Background="{StaticResource SliderThumb.Track.Border}"
BorderBrush="{StaticResource SliderThumb.Track.Border}"
BorderThickness="1">
<Canvas Margin="-6,-1">
<Rectangle
x:Name="PART_SelectionRange"
Height="4.0"
Fill="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"
Visibility="Hidden" />
</Canvas>
</Border>
<Ellipse
Grid.Row="1"
Width="10"
Height="10"
Fill="Black" />
<Line
Grid.Row="1"
Grid.RowSpan="3"
VerticalAlignment="Center"
Fill="Purple"
Stroke="Purple"
StrokeThickness="3"
X1="{Binding Path=LineX1, RelativeSource={RelativeSource TemplatedParent}}"
X2="{Binding Path=LineX2, RelativeSource={RelativeSource TemplatedParent}}"
Y1="0"
Y2="0" />
<Track x:Name="PART_Track" Grid.Row="1">
<Track.DecreaseRepeatButton>
<RepeatButton Command="{x:Static Slider.DecreaseLarge}"/>
</Track.DecreaseRepeatButton>
<Track.IncreaseRepeatButton>
<RepeatButton Command="{x:Static Slider.IncreaseLarge}"/>
</Track.IncreaseRepeatButton>
<Track.Thumb>
<Thumb
x:Name="Thumb"
Width="11"
Height="18"
VerticalAlignment="Center"
Focusable="False"
OverridesDefault
Template="{StaticResource SliderThumbHorizontalDefault}" />
</Track.Thumb>
</Track>
</Grid>主要颜色距离的显示通过X1和X2的编辑显示距离
[*]所以需要将这里的X1和X2改成自定义进行绑定
[*]新建自定义控件
自定义控件CentreSlider
public class CentreSlider : Slider {
protected override void OnValueChanged(double oldValue, double newValue) {
base.OnValueChanged(oldValue, newValue);
RefreshSlider();
}
protected override void OnRenderSizeChanged(SizeChangedInfo sizeInfo) {
base.OnRenderSizeChanged(sizeInfo);
RefreshSlider();
}
public double LineX1 {
get { return (double)GetValue(LineX1Property); }
set { SetValue(LineX1Property, value); }
}
public double LineX2 {
get { return (double)GetValue(LineX2Property); }
set { SetValue(LineX2Property, value); }
}
// Using a DependencyProperty as the backing store for LineX2.This enables animation, styling, binding, etc...
public static readonly DependencyProperty LineX2Property =
DependencyProperty.Register("LineX2", typeof(double), typeof(CentreSlider), new PropertyMetadata(0.0));
// Using a DependencyProperty as the backing store for LineX1.This enables animation, styling, binding, etc...
public static readonly DependencyProperty LineX1Property =
DependencyProperty.Register("LineX1", typeof(double), typeof(CentreSlider), new PropertyMetadata(0.0));
public void RefreshSlider() {
var Proportion = ActualWidth / Maximum;
LineX1 = ActualWidth / 2;
LineX2 = Value * Proportion;
}
}最终效果
来源:https://www.cnblogs.com/qingxi11/archive/2023/06/09/17468662.html
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