Некоторое время назад в WPF я попытался переделать ColorPicker, и мне понадобился аналогичный элемент управления для ввода значений R, G, B и A.
Это не завершено, но дает довольно хорошее начало. Он поддерживает перетаскивание и ввод, но я выбрал другую схему перетаскивания, потому что мне не нравится перетаскивание Blend.
Вот что я сделал:
[TemplateVisualState(GroupName = "EditStates", Name = "DragMode")]
[TemplateVisualState(GroupName = "EditStates", Name = "TypeMode")]
public class ColorComponentSlider : Control
{
static ColorComponentSlider()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(ColorComponentSlider), new FrameworkPropertyMetadata(typeof(ColorComponentSlider)));
}
private bool _isTemplateApplied = false;
private TextBox _textBox;
private TextBlock _textBlock;
private GradientStop _gradientStart;
private GradientStop _gradientEnd;
private Grid _progressGrid;
private bool _isDragging = false;
public string Component
{
get { return (string)GetValue(ComponentProperty); }
set { SetValue(ComponentProperty, value); }
}
// Using a DependencyProperty as the backing store for Component. This enables animation, styling, binding, etc...
public static readonly DependencyProperty ComponentProperty =
DependencyProperty.Register("Component", typeof(string), typeof(ColorComponentSlider), new UIPropertyMetadata("R", OnComponentPropertyChanged));
private static void OnComponentPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
var colorComponentSlider = sender as ColorComponentSlider;
colorComponentSlider.UpdateChildControls();
}
public Color Color
{
get { return (Color)GetValue(ColorProperty); }
set { SetValue(ColorProperty, value); }
}
// Using a DependencyProperty as the backing store for Color. This enables animation, styling, binding, etc...
public static readonly DependencyProperty ColorProperty =
DependencyProperty.Register("Color", typeof(Color), typeof(ColorComponentSlider), new UIPropertyMetadata(Colors.Black, OnColorPropertyChanged));
private static void OnColorPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
var colorComponentSlider = sender as ColorComponentSlider;
colorComponentSlider.UpdateChildControls();
}
private void UpdateChildControls()
{
if (_isTemplateApplied)
{
double progress = 0;
string colorComponent = String.Empty;
var comp = Component.ToUpper();
if (comp == "A")
{
_gradientStart.Color = Color.FromArgb(0, Color.R, Color.G, Color.B);
_gradientEnd.Color = Color.FromArgb(255, Color.R, Color.G, Color.B);
colorComponent = Color.A.ToString();
progress = Color.A;
}
else if (comp == "R")
{
_gradientStart.Color = Color.FromArgb(Color.A, 0, Color.G, Color.B);
_gradientEnd.Color = Color.FromArgb(Color.A, 255, Color.G, Color.B);
colorComponent = Color.R.ToString();
progress = Color.R;
}
else if (comp == "G")
{
_gradientStart.Color = Color.FromArgb(Color.A, Color.R, 0, Color.B);
_gradientEnd.Color = Color.FromArgb(Color.A, Color.R, 255, Color.B);
colorComponent = Color.G.ToString();
progress = Color.G;
}
else if (comp == "B")
{
_gradientStart.Color = Color.FromArgb(Color.A, Color.R, Color.G, 0);
_gradientEnd.Color = Color.FromArgb(Color.A, Color.R, Color.G, 255);
colorComponent = Color.B.ToString();
progress = Color.B;
}
if (colorComponent.Length > 0)
{
_textBlock.Text = colorComponent;
_textBox.Text = colorComponent;
_progressGrid.ColumnDefinitions[0].Width = new GridLength(progress, GridUnitType.Star);
_progressGrid.ColumnDefinitions[1].Width = new GridLength(255 - progress, GridUnitType.Star);
}
}
}
private VisualStateGroup _editStates = null;
private VisualState _dragModeState = null;
private VisualState _typeModeState = null;
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
_textBox = this.Template.FindName("textBox", this) as TextBox;
_textBlock = this.Template.FindName("textBlock", this) as TextBlock;
_gradientStart = this.Template.FindName("PART_GradientStart", this) as GradientStop;
_gradientEnd = this.Template.FindName("PART_GradientEnd", this) as GradientStop;
_progressGrid = this.Template.FindName("PART_Progress", this) as Grid;
var root = this.Template.FindName("root", this) as FrameworkElement;
var stateGroups = VisualStateManager.GetVisualStateGroups(root);
for (int i = 0; i < stateGroups.Count; i++)
{
var stateGroup = stateGroups[i] as VisualStateGroup;
if (stateGroup != null && stateGroup.Name == "EditStates")
{
_editStates = stateGroup;
for (int s = 0; s < _editStates.States.Count; s++)
{
var state = _editStates.States[s] as VisualState;
if (state.Name == "DragMode")
{
_dragModeState = state;
}
else if (state.Name == "TypeMode")
{
_typeModeState = state;
}
}
break;
}
}
VisualStateManager.GoToState(this, _dragModeState.Name, false);
_isTemplateApplied = true;
UpdateChildControls();
}
private Point _mouseLeftButtonDownPreviousPosition;
protected override void OnMouseLeftButtonDown(System.Windows.Input.MouseButtonEventArgs e)
{
base.OnMouseLeftButtonDown(e);
if (_editStates.CurrentState == _dragModeState)
{
_mouseLeftButtonDownPreviousPosition = e.GetPosition(this);
Mouse.Capture(this);
}
}
protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMouseMove(e);
if (_editStates.CurrentState == _dragModeState && e.LeftButton == MouseButtonState.Pressed)
{
_isDragging = true;
var position = e.GetPosition(this);
int offset = (int)(_mouseLeftButtonDownPreviousPosition.Y - position.Y);
string comp = Component.ToUpper();
if (comp == "A")
{
int v;
if (Color.A + offset < 0)
{
v = 0;
}
else if (Color.A + offset > 255)
{
v = 255;
}
else
{
v = Color.A + offset;
}
Color = Color.FromArgb((byte)v, Color.R, Color.G, Color.B);
}
else if (comp == "R")
{
int v;
if (Color.R + offset < 0)
{
v = 0;
}
else if (Color.R + offset > 255)
{
v = 255;
}
else
{
v = Color.R + offset;
}
Color = Color.FromArgb(Color.A, (byte)v, Color.G, Color.B);
}
else if (comp == "G")
{
int v;
if (Color.G + offset < 0)
{
v = 0;
}
else if (Color.G + offset > 255)
{
v = 255;
}
else
{
v = Color.G + offset;
}
Color = Color.FromArgb(Color.A, Color.R, (byte)v, Color.B);
}
else if (comp == "B")
{
int v;
if (Color.B + offset < 0)
{
v = 0;
}
else if (Color.B + offset > 255)
{
v = 255;
}
else
{
v = Color.B + offset;
}
Color = Color.FromArgb(Color.A, Color.R, Color.G, (byte)v);
}
_mouseLeftButtonDownPreviousPosition = position;
}
else
{
_isDragging = false;
}
}
protected override void OnMouseLeftButtonUp(System.Windows.Input.MouseButtonEventArgs e)
{
base.OnMouseLeftButtonUp(e);
if (_editStates.CurrentState == _dragModeState)
{
var position = e.GetPosition(this);
Mouse.Capture(null);
if (!_isDragging && _mouseLeftButtonDownPreviousPosition == position)
{
VisualStateManager.GoToState(this, _typeModeState.Name, true);
_textBox.SelectAll();
}
_isDragging = false;
}
}
protected override void OnGotKeyboardFocus(System.Windows.Input.KeyboardFocusChangedEventArgs e)
{
base.OnGotKeyboardFocus(e);
if (_editStates.CurrentState == _dragModeState)
{
VisualStateManager.GoToState(this, _typeModeState.Name, true);
}
}
protected override void OnLostKeyboardFocus(System.Windows.Input.KeyboardFocusChangedEventArgs e)
{
base.OnLostKeyboardFocus(e);
if (_editStates.CurrentState == _typeModeState)
{
VisualStateManager.GoToState(this, _dragModeState.Name, true);
byte v;
if (Byte.TryParse(_textBox.Text, out v))
{
string comp = Component.ToUpper();
if (comp == "A")
{
Color = Color.FromArgb((byte)v, Color.R, Color.G, Color.B);
}
else if (comp == "R")
{
Color = Color.FromArgb(Color.A, (byte)v, Color.G, Color.B);
}
else if (comp == "G")
{
Color = Color.FromArgb(Color.A, Color.R, (byte)v, Color.B);
}
else if (comp == "B")
{
Color = Color.FromArgb(Color.A, Color.R, Color.G, (byte)v);
}
}
}
}
}
XAML:
<Style BasedOn="{x:Null}"
TargetType="{x:Type local:ColorComponentSlider}">
<Setter Property="Foreground"
Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}" />
<Setter Property="Background"
Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}" />
<Setter Property="BorderBrush"
Value="Black" />
<Setter Property="BorderThickness"
Value="1" />
<Setter Property="Padding"
Value="1" />
<Setter Property="AllowDrop"
Value="true" />
<Setter Property="FocusVisualStyle"
Value="{x:Null}" />
<Setter Property="Focusable"
Value="True" />
<Setter Property="ScrollViewer.PanningMode"
Value="VerticalFirst" />
<Setter Property="Stylus.IsFlicksEnabled"
Value="False" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type local:ColorComponentSlider}">
<Border x:Name="root"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
Background="{TemplateBinding Background}"
SnapsToDevicePixels="true"
CornerRadius="5"
ClipToBounds="True">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="EditStates">
<VisualState x:Name="DragMode" />
<VisualState x:Name="TypeMode">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)"
Storyboard.TargetName="textBlock">
<DiscreteObjectKeyFrame KeyTime="0"
Value="{x:Static Visibility.Hidden}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)"
Storyboard.TargetName="textBox">
<DiscreteObjectKeyFrame KeyTime="0"
Value="{x:Static Visibility.Visible}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="auto" />
<RowDefinition Height="*" MinHeight="5" />
</Grid.RowDefinitions>
<Grid x:Name="PART_Progress"
UseLayoutRounding="True"
RenderOptions.EdgeMode="Unspecified">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Border CornerRadius="3,3,0,0"
Background="#FF666666" />
</Grid>
<TextBlock x:Name="textBlock"
Background="{x:Null}"
Foreground="{TemplateBinding Foreground}"
Margin="0"
Padding="2,2,0,0" />
<TextBox x:Name="textBox"
Background="{x:Null}"
BorderThickness="0"
CaretBrush="{TemplateBinding Foreground}"
Foreground="{TemplateBinding Foreground}"
Margin="0"
Padding="0,2,0,0"
Visibility="Hidden" />
<Border Grid.Row="1"
CornerRadius="0,0,3,3">
<Border.Background>
<DrawingBrush TileMode="Tile"
Viewport="0,0,10,10"
ViewportUnits="Absolute">
<DrawingBrush.Drawing>
<DrawingGroup>
<GeometryDrawing Brush="White">
<GeometryDrawing.Geometry>
<RectangleGeometry Rect="0,0,10,10" />
</GeometryDrawing.Geometry>
</GeometryDrawing>
<GeometryDrawing Brush="Silver">
<GeometryDrawing.Geometry>
<GeometryGroup>
<RectangleGeometry Rect="0,0,5,5" />
<RectangleGeometry Rect="5,5,5,5" />
</GeometryGroup>
</GeometryDrawing.Geometry>
</GeometryDrawing>
</DrawingGroup>
</DrawingBrush.Drawing>
</DrawingBrush>
</Border.Background>
</Border>
<Border Grid.Row="1"
CornerRadius="0,0,3,3"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="0,1,0,0">
<Border.Background>
<LinearGradientBrush EndPoint="1,0.5"
StartPoint="0,0.5">
<GradientStop x:Name="PART_GradientStart"
Offset="0"
Color="#00000000" />
<GradientStop x:Name="PART_GradientEnd"
Offset="1"
Color="#FFFFFFFF" />
</LinearGradientBrush>
</Border.Background>
</Border>
</Grid>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsEnabled"
Value="false">
<Setter Property="Background"
TargetName="root"
Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}" />
<Setter Property="Foreground"
Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}" />
</Trigger>
<Trigger SourceName="textBox"
Property="Visibility"
Value="Visible">
<Setter TargetName="textBox"
Property="FocusManager.FocusedElement"
Value="{Binding ElementName=textBox}" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>