使用画笔设置<stackpanel>背景颜色

时间:2018-11-10 20:05:50

标签: wpf brush

因此,我创建了一个包含滑块,scrollBars和IntegerUpDowns的设计,这些滑块,scrollBars和IntegerUpDowns都绑定到gheter,它们同时移动并且具有相同的值。我每个都有,每个ARGB一个。我在中间有一个stackPanel,在修改任何“工具”时,应更改BackgroundColor。

就我所想,我只需要了解其中一个工具值即可通过它们提供的数据来设置背景...但是我如何实现呢?

到目前为止,我已经对此进行了编码:

public partial class MainWindow : Window
{
    SolidColorBrush brush;

    public MainWindow()
    {
        InitializeComponent();

        brush = new SolidColorBrush();
        brush.Color = Color.FromArgb(0, 0, 0, 0);
        stkColor.Background = brush;
    }

    private void scbScrollA_Scroll(object sender, System.Windows.Controls.Primitives.ScrollEventArgs e)
    {
        brush.Color.A = scbScrollA.Value(); //doesn't work
    }

    private void scbScrollR_Scroll(object sender, System.Windows.Controls.Primitives.ScrollEventArgs e)
    {

    }

    private void scbScrollG_Scroll(object sender, System.Windows.Controls.Primitives.ScrollEventArgs e)
    {

    }

    private void scbScrollB_Scroll(object sender, System.Windows.Controls.Primitives.ScrollEventArgs e)
    {

    }
}

正如我所说,仅通过了解滚动数据,因为我已将Bindings与所有其他工具一起使用,因此我可以设法设置颜色并在每次修改任何数据时刷新。

我的绑定:

<xctk:IntegerUpDown Grid.Column="7" Grid.Row="0" x:Name="iudB" Increment="10" Minimum="0" Maximum="255"
                                Value="{Binding ElementName=scbScrollB, Path=Value}"
                                />

<ScrollBar Grid.Column="1" Grid.Row="6" Grid.RowSpan="2" Width="Auto" Orientation="Horizontal" 
                   Minimum="0" Maximum="255" x:Name="scbScrollB" 
                   Scroll="scbScrollB_Scroll" SmallChange="1" 
                   LargeChange="10" Value="{Binding ElementName=sliderB, Path=Value}"
                   />

<Slider 
                Grid.Column="6" Grid.Row="1" Grid.RowSpan="1"
                Orientation="Vertical"
                LargeChange="10" 
                Maximum="255" 
                SmallChange="1" 
                TickPlacement="TopLeft" 
                Minimum="0" 
                TickFrequency="25"
                x:Name="sliderB"
                />

滑块没有绑定,因为据我所知它们是双向的。他们都没有给出错误。

1 个答案:

答案 0 :(得分:1)

创建一个视图模型,该模型具有用于Color的四个分量的四个字节属性和用于生成的颜色值的Color属性。

public class ViewModel : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    private byte alpha;
    private byte red;
    private byte green;
    private byte blue;

    private void NotifyPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }

    private void SetColorComponent(ref byte field, byte value, string propertyName)
    {
        if (field != value)
        {
            field = value;
            NotifyPropertyChanged(propertyName);
            NotifyPropertyChanged(nameof(Color));
        }
    }

    public byte Alpha
    {
        get { return alpha; }
        set { SetColorComponent(ref alpha, value, nameof(Alpha)); }
    }

    public byte Red
    {
        get { return red; }
        set { SetColorComponent(ref red, value, nameof(Red)); }
    }

    public byte Green
    {
        get { return green; }
        set { SetColorComponent(ref green, value, nameof(Green)); }
    }

    public byte Blue
    {
        get { return blue; }
        set { SetColorComponent(ref blue, value, nameof(Blue)); }
    }

    public Color Color
    {
        get { return Color.FromArgb(alpha, red, green, blue); }
    }
}

将视图模型的实例分配给窗口的DataContext,并将Sliders,ScrollBars等绑定到视图模型属性。

<Window ...>
    <Window.DataContext>
        <local:ViewModel/>
    </Window.DataContext>
    <StackPanel>
        <StackPanel.Background>
            <SolidColorBrush Color="{Binding Color}"/>
        </StackPanel.Background>

        <Slider Minimum="0" Maximum="255" Value="{Binding Alpha}"/>
        <Slider Minimum="0" Maximum="255" Value="{Binding Red}"/>
        <Slider Minimum="0" Maximum="255" Value="{Binding Green}"/>
        <Slider Minimum="0" Maximum="255" Value="{Binding Blue}"/>

        <ScrollBar Minimum="0" Maximum="255" Value="{Binding Alpha}" Orientation="Horizontal"/>
        <ScrollBar Minimum="0" Maximum="255" Value="{Binding Red}" Orientation="Horizontal"/>
        <ScrollBar Minimum="0" Maximum="255" Value="{Binding Green}" Orientation="Horizontal"/>
        <ScrollBar Minimum="0" Maximum="255" Value="{Binding Blue}" Orientation="Horizontal"/>
    </StackPanel>
</Window>