我們瞭解到在能在xaml中完成的設計,一般在隱藏文件中也可通過代碼完成;本節中的案例是實現對同一設計效果的不同寫法;例如在隱藏文件中代碼如下:
View Code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
namespace LinearGB
{
public partial class MainPage : PhoneApplicationPage
{
// 構造函數
public MainPage()
{
InitializeComponent();
Init();
}
private void Init()
{
TextBlock tb = new TextBlock();
tb.Name = "tbName";
tb.Text = "顯示顏色";
tb.VerticalAlignment = VerticalAlignment.Center;
tb.HorizontalAlignment = HorizontalAlignment.Center;
//實例化
//LinearGradientBrush lgb1 = new LinearGradientBrush();
LinearGradientBrush lgb2 = new LinearGradientBrush();
GradientStopCollection gsc = new GradientStopCollection();
//設置過渡點的顏色和偏移量
GradientStop gt1 = new GradientStop();
//Color c = new Color();
//c.R = 255;
//c.A = 230;
//c.G = 22;
//c.B = 43;
//gt1.Color=c;
gt1.Color = Color.FromArgb(255, 164, 143, 112);
gt1.Offset = 0.2;
gsc.Add(gt1);
GradientStop gt2 = new GradientStop();
//Color c2 = new Color();
//c2.R = 251;
//c2.A = 231;
//c2.G = 12;
//c2.B = 13;
//gt2.Color = c2;
gt2.Color = Color.FromArgb(229, 178, 234, 188);
gt2.Offset = 0.7;
gsc.Add(gt2);
//設置線性漸變色的起始座標
Point p1 = new Point(0, 0);
lgb2.StartPoint = p1;
//設置線性漸變色的終止座標
Point p2 = new Point(1, 1);
lgb2.EndPoint = p2;
//設置漸變停止點
lgb2.GradientStops = gsc;
//設置前景色
tb.Foreground = lgb2;
ContentPanel.Children.Add(tb);
}
}
}
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
namespace LinearGB
{
public partial class MainPage : PhoneApplicationPage
{
// 構造函數
public MainPage()
{
InitializeComponent();
Init();
}
private void Init()
{
TextBlock tb = new TextBlock();
tb.Name = "tbName";
tb.Text = "顯示顏色";
tb.VerticalAlignment = VerticalAlignment.Center;
tb.HorizontalAlignment = HorizontalAlignment.Center;
//實例化
//LinearGradientBrush lgb1 = new LinearGradientBrush();
LinearGradientBrush lgb2 = new LinearGradientBrush();
GradientStopCollection gsc = new GradientStopCollection();
//設置過渡點的顏色和偏移量
GradientStop gt1 = new GradientStop();
//Color c = new Color();
//c.R = 255;
//c.A = 230;
//c.G = 22;
//c.B = 43;
//gt1.Color=c;
gt1.Color = Color.FromArgb(255, 164, 143, 112);
gt1.Offset = 0.2;
gsc.Add(gt1);
GradientStop gt2 = new GradientStop();
//Color c2 = new Color();
//c2.R = 251;
//c2.A = 231;
//c2.G = 12;
//c2.B = 13;
//gt2.Color = c2;
gt2.Color = Color.FromArgb(229, 178, 234, 188);
gt2.Offset = 0.7;
gsc.Add(gt2);
//設置線性漸變色的起始座標
Point p1 = new Point(0, 0);
lgb2.StartPoint = p1;
//設置線性漸變色的終止座標
Point p2 = new Point(1, 1);
lgb2.EndPoint = p2;
//設置漸變停止點
lgb2.GradientStops = gsc;
//設置前景色
tb.Foreground = lgb2;
ContentPanel.Children.Add(tb);
}
}
}
上面代碼實現的效果:
從xaml文件中同樣也可以實現類似的效果,ContentPanel下的textblock內容如下:
View Code
<TextBlock x:Name="tbName" Text="顯示顏色" VerticalAlignment="Center" HorizontalAlignment="Center" >
<TextBlock.Foreground>
<LinearGradientBrush StartPoint="0 0" EndPoint="1 1">
<LinearGradientBrush.GradientStops>
<GradientStopCollection>
<GradientStop Offset="0.2" Color="AliceBlue"></GradientStop>
<GradientStop Offset="0.7" Color="Brown"></GradientStop>
</GradientStopCollection>
</LinearGradientBrush.GradientStops>
</LinearGradientBrush>
</TextBlock.Foreground>
</TextBlock>
<TextBlock.Foreground>
<LinearGradientBrush StartPoint="0 0" EndPoint="1 1">
<LinearGradientBrush.GradientStops>
<GradientStopCollection>
<GradientStop Offset="0.2" Color="AliceBlue"></GradientStop>
<GradientStop Offset="0.7" Color="Brown"></GradientStop>
</GradientStopCollection>
</LinearGradientBrush.GradientStops>
</LinearGradientBrush>
</TextBlock.Foreground>
</TextBlock>
實現的效果:
兩種做法都是引入了LinearGradientBrush類,LinearGradienBush類是利用線性繪製顏色區域,隱藏代碼中已經有必要的文字註釋,官方的解釋和部分概念的理解如下:
由於LinearGradientBrush和RadialGradienBrush都是有GradientBrush派生而來,所以很多屬性和LinearGradientBrush類的屬性相同;
RadialGradienBrush類的實例代碼如下:
<TextBlock x:Name="tbRadia" VerticalAlignment="Center" HorizontalAlignment="Center" Text="擴散式輻射">
<TextBlock.Foreground>
<RadialGradientBrush GradientOrigin="0.5,0.5" Center="0.5,0.5"
RadiusX="0.5" RadiusY="0.5">
<GradientStop Color="Yellow" Offset="0" />
<GradientStop Color="Red" Offset="0.25" />
<GradientStop Color="Blue" Offset="0.75" />
<GradientStop Color="LimeGreen" Offset="1" />
</RadialGradientBrush>
</TextBlock.Foreground>
</TextBlock>
<TextBlock.Foreground>
<RadialGradientBrush GradientOrigin="0.5,0.5" Center="0.5,0.5"
RadiusX="0.5" RadiusY="0.5">
<GradientStop Color="Yellow" Offset="0" />
<GradientStop Color="Red" Offset="0.25" />
<GradientStop Color="Blue" Offset="0.75" />
<GradientStop Color="LimeGreen" Offset="1" />
</RadialGradientBrush>
</TextBlock.Foreground>
</TextBlock>
效果圖:
徑向漸變中的漸變停止點