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using System;
using System.ComponentModel;
using System.Diagnostics;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
namespace ColorPicker
{
/// <summary>
/// Interaction logic for AlphaDisplay.xaml
/// </summary>
public partial class AlphaDisplay : UserControl
{
public static Type ClassType
{
get { return typeof(AlphaDisplay); }
}
public event EventHandler<EventArgs<byte>> AlphaChanged;
public AlphaDisplay()
{
InitializeComponent();
imgTransparency.Source = mTransparencyBitmap;
}
private WriteableBitmap mTransparencyBitmap = new WriteableBitmap(24, 256, 96, 96, PixelFormats.Bgra32, null);
#region Color
public static DependencyProperty ColorProperty = DependencyProperty.Register("Color", typeof(Color), ClassType,
new FrameworkPropertyMetadata(Colors.Black, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault, OnColorChanged));
[Category("ColorPicker")]
public Color Color
{
get
{
return (Color)GetValue(ColorProperty);
}
set
{
SetValue(ColorProperty, value);
}
}
private static void OnColorChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var color = (Color)e.NewValue;
var rd = (AlphaDisplay)d;
rd.OnColorChanged(color);
}
private void OnColorChanged(Color color)
{
unsafe
{
mTransparencyBitmap.Lock();
int currentPixel = -1;
byte* pStart = (byte*)(void*)mTransparencyBitmap.BackBuffer;
for (int iRow = 0; iRow < mTransparencyBitmap.PixelHeight; iRow++)
{
for (int iCol = 0; iCol < mTransparencyBitmap.PixelWidth; iCol++)
{
currentPixel++;
*(pStart + currentPixel * 4 + 0) = color.B; //Blue
*(pStart + currentPixel * 4 + 1) = color.G; //Green
*(pStart + currentPixel * 4 + 2) = color.R; //red
*(pStart + currentPixel * 4 + 3) = (byte)(255 - iRow); //alpha
}
}
mTransparencyBitmap.AddDirtyRect(new Int32Rect(0, 0, mTransparencyBitmap.PixelWidth, mTransparencyBitmap.PixelHeight));
mTransparencyBitmap.Unlock();
}
}
#endregion
#region Alpha
public static DependencyProperty AlphaProperty = DependencyProperty.Register("Alpha", typeof(byte), ClassType, new PropertyMetadata((byte)255, new PropertyChangedCallback(OnAlphaChanged)));
public byte Alpha
{
get
{
return (byte)GetValue(AlphaProperty);
}
set
{
SetValue(AlphaProperty, value);
}
}
private static void OnAlphaChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var display = (AlphaDisplay) d;
display.sAlpha.Value = (byte)e.NewValue/2.55 ;
if (display.AlphaChanged != null)
{
display.AlphaChanged(display,new EventArgs<byte>(display.Alpha));
}
}
#endregion
private void sAlpha_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
{
Alpha = Convert.ToByte( e.NewValue*2.55);
}
private void imgTransparency_MouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
var alphaPercent = 100 * (imgTransparency.ActualHeight - (e.GetPosition((IInputElement)sender)).Y) / imgTransparency.ActualHeight;
sAlpha.Value = alphaPercent;
}
private void imgTransparency_MouseMove(object sender, System.Windows.Input.MouseEventArgs e)
{
if (Mouse.LeftButton == MouseButtonState.Pressed)
{
var alphaPercent = 100 * (imgTransparency.ActualHeight - (e.GetPosition((IInputElement)sender)).Y) / imgTransparency.ActualHeight;
sAlpha.Value = alphaPercent;
}
}
}
}
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