在SnipperImages中为了进行图片列表导航(前后方向)设计了ImageSelector控件,而这个控件不同于
之前介绍过的Button, CheckBox, Slider,主要是其xaml中的UI元素变得数量庞大且行为更加复杂。所以通过
了解这个控件,我们能够更好的熟悉StoryBoard,Path,ImageBrush,ScaleTransform,TranslateTransform
等对象及属性的使用场景。
首先来看一下DEMO运行效果:
显示一张图片所使用的ui元素如下所示(其中之一):
<
Path
x:Name
="leftImg3"
Stroke
="White"
MouseLeftButtonDown
="OnImgClicked"
>
<
Path.Data
>
<
PathGeometry
>
<
PathFigure
x:Name
="pathFigure_leftImg3"
IsClosed
="True"
StartPoint
="130,15"
>
<
LineSegment
x:Name
="line1_leftImg3"
Point
="250,25"
/>
<
LineSegment
x:Name
="line2_leftImg3"
Point
="250,95"
/>
<
LineSegment
x:Name
="line3_leftImg3"
Point
="130,115"
/>
</
PathFigure
>
</
PathGeometry
>
</
Path.Data
>
<
Path.Fill
>
<
ImageBrush
x:Name
="leftImg3Brush"
Stretch
="Fill"
/>
</
Path.Fill
>
</
Path
>
大家发现了,上面的内容只是可以正常显示一个图像(通过设置leftImg3Brush的ImageSource属性)而
在每一个图片下方都会有一个倒影效果,其使用的就是ScaleTransform,其代码布局如下:
<
Path
x:Name
="left3Reflection"
Stroke
="White"
>
<
Path.Data
>
<
PathGeometry
>
<
PathFigure
x:Name
="pathFigure_left3Reflection"
IsClosed
="True"
StartPoint
="130,120"
>
<
LineSegment
x:Name
="line1_left3Reflection"
Point
="250,100"
/>
<
LineSegment
x:Name
="line2_left3Reflection"
Point
="250,170"
/>
<
LineSegment
x:Name
="line3_left3Reflection"
Point
="130,190"
/>
</
PathFigure
>
</
PathGeometry
>
</
Path.Data
>
<
Path.Fill
>
<
ImageBrush
x:Name
="leftReflection3Brush"
Stretch
="Fill"
>
<
ImageBrush.RelativeTransform
>
<
TransformGroup
>
<!--
实现投影效果
-->
<
ScaleTransform
ScaleX
="1"
ScaleY
="-1"
/>
<
TranslateTransform
Y
="1"
/>
</
TransformGroup
>
</
ImageBrush.RelativeTransform
>
</
ImageBrush
>
</
Path.Fill
>
<
Path.OpacityMask
>
<
LinearGradientBrush
StartPoint
="0.5,0"
EndPoint
="0.5,1"
>
<
LinearGradientBrush.GradientStops
>
<
GradientStop
Offset
="0.0"
Color
="#2F000000"
/>
<
GradientStop
Offset
="1.0"
Color
="#00000000"
/>
</
LinearGradientBrush.GradientStops
>
</
LinearGradientBrush
>
</
Path.OpacityMask
>
</
Path
>
而有关如何实现倒影效果可以参考
这篇文章。当然如果使用BLEND来制作倒影效果会更容易,但不知道为
什么,目前的BLEND还无法实现对子对象的属性设置(因为上面的XAML代码被放在了PATH对象中,而BLEND
在可视状态下只能看到PATH那一层的对象,而无法设置ImageBrush="leftReflection2Brush"这个对象)。
有了7个path对象加载图像(使用里面的ImageBrush的ImageSource属性)。还有7个path对象分别对应
实现7个图像的倒影效果。也就是下图中所显示的:
当然除此以外,还有2组PATH对象分别是:
lastImgBrush,lastReflectionBrush:用于当点击右侧导航按钮时,设置为当前分页下最右侧图像,以
避免出现图片为空(空框)的情况。
firstImgBrush,firstReflectionBrush:用于当点击左侧导航按钮时,设置为当前分页下最左侧图像,以
避免出现图片为空(空框)的情况。
有了这些静态的UI元素之后,我们还需要让其动起来,所以要用到StoryBoard(故事板)。而有关该内容
介绍可参见如下链接:使用silverlight中的Storyboard实现动画效果
因为本DEMO中用的是PointAnimation(当动画值的变化[FROM ...TO...]类型是 Point型时使用), 所以这
里直接就把相应的Xaml代码放在这里了,代码很简单。
首先是当点击右侧导航按钮时的Storyboard代码:
Code
<Storyboard x:Name='flowForward' Completed='onForwardFlowCompleted'>
<PointAnimation Storyboard.TargetName='pathFigure_centerImg' Storyboard.TargetProperty='StartPoint' From='250,15' To='330,5' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line1_centerImg' Storyboard.TargetProperty='Point' From='370,25' To='470,5' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line2_centerImg' Storyboard.TargetProperty='Point' From='370,95' To='470,145' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line3_centerImg' Storyboard.TargetProperty='Point' From='250,115' To='330,145' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='pathFigure_centerReflection' Storyboard.TargetProperty='StartPoint' From='250,120' To='330,155' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line1_centerReflection' Storyboard.TargetProperty='Point' From='370,100' To='470,155' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line2_centerReflection' Storyboard.TargetProperty='Point' From='370,170' To='490,195' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line3_centerReflection' Storyboard.TargetProperty='Point' From='250,190' To='310,195' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='pathFigure_rightImg1' Storyboard.TargetProperty='StartPoint' From='330,5' To='430,25' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line1_rightImg1' Storyboard.TargetProperty='Point' From='470,5' To='550,15' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line2_rightImg1' Storyboard.TargetProperty='Point' From='470,145' To='550,115' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line3_rightImg1' Storyboard.TargetProperty='Point' From='330,145' To='430,95' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='pathFigure_right1Reflection' Storyboard.TargetProperty='StartPoint' From='330,155' To='430,100' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line1_right1Reflection' Storyboard.TargetProperty='Point' From='470,155' To='550,120' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line2_right1Reflection' Storyboard.TargetProperty='Point' From='490,195' To='550,190' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line3_right1Reflection' Storyboard.TargetProperty='Point' From='310,195' To='430,170' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='pathFigure_rightImg2' Storyboard.TargetProperty='StartPoint' From='430,25' To='500,25' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line1_rightImg2' Storyboard.TargetProperty='Point' From='550,15' To='620,15' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line2_rightImg2' Storyboard.TargetProperty='Point' From='550,115' To='620,115' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line3_rightImg2' Storyboard.TargetProperty='Point' From='430,95' To='500,95' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='pathFigure_right2Reflection' Storyboard.TargetProperty='StartPoint' From='430,100' To='500,100' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line1_right2Reflection' Storyboard.TargetProperty='Point' From='550,120' To='620,120' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line2_right2Reflection' Storyboard.TargetProperty='Point' From='550,190' To='620,190' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line3_right2Reflection' Storyboard.TargetProperty='Point' From='430,170' To='500,170' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='pathFigure_rightImg3' Storyboard.TargetProperty='StartPoint' From='500,25' To='550,25' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line1_rightImg3' Storyboard.TargetProperty='Point' From='620,15' To='670,15' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line2_rightImg3' Storyboard.TargetProperty='Point' From='620,115' To='670,115' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line3_rightImg3' Storyboard.TargetProperty='Point' From='500,95' To='550,95' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='pathFigure_right3Reflection' Storyboard.TargetProperty='StartPoint' From='500,100' To='550,100' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line1_right3Reflection' Storyboard.TargetProperty='Point' From='620,120' To='670,120' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line2_right3Reflection' Storyboard.TargetProperty='Point' From='620,190' To='670,190' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line3_right3Reflection' Storyboard.TargetProperty='Point' From='500,170' To='550,170' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='pathFigure_leftImg1' Storyboard.TargetProperty='StartPoint' From='180,15' To='250,15' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line1_leftImg1' Storyboard.TargetProperty='Point' From='300,25' To='370,25' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line2_leftImg1' Storyboard.TargetProperty='Point' From='300,95' To='370,95' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line3_leftImg1' Storyboard.TargetProperty='Point' From='180,115' To='250,115' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='pathFigure_left1Reflection' Storyboard.TargetProperty='StartPoint' From='180,120' To='250,120' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line1_left1Reflection' Storyboard.TargetProperty='Point' From='300,100' To='370,100' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line2_left1Reflection' Storyboard.TargetProperty='Point' From='300,170' To='370,170' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line3_left1Reflection' Storyboard.TargetProperty='Point' From='180,190' To='250,190' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='pathFigure_leftImg2' Storyboard.TargetProperty='StartPoint' From='130,15' To='180,15' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line1_leftImg2' Storyboard.TargetProperty='Point' From='250,25' To='300,25' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line2_leftImg2' Storyboard.TargetProperty='Point' From='250,95' To='300,95' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line3_leftImg2' Storyboard.TargetProperty='Point' From='130,115' To='180,115' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='pathFigure_left2Reflection' Storyboard.TargetProperty='StartPoint' From='130,120' To='180,120' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line1_left2Reflection' Storyboard.TargetProperty='Point' From='250,100' To='300,100' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line2_left2Reflection' Storyboard.TargetProperty='Point' From='250,170' To='300,170' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line3_left2Reflection' Storyboard.TargetProperty='Point' From='130,190' To='180,190' Duration='0:0:0.5'/>
</Storyboard>
然后是点击左侧导航时的StoryBoard代码:
Code
<Storyboard x:Name='flowBackward' Completed='onBackwardFlowCompleted'>
<PointAnimation Storyboard.TargetName='pathFigure_centerImg' Storyboard.TargetProperty='StartPoint' From='430,25' To='330,5' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line1_centerImg' Storyboard.TargetProperty='Point' From='550,15' To='470,5' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line2_centerImg' Storyboard.TargetProperty='Point' From='550,115' To='470,145' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line3_centerImg' Storyboard.TargetProperty='Point' From='430,95' To='330,145' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='pathFigure_centerReflection' Storyboard.TargetProperty='StartPoint' From='430,100' To='330,155' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line1_centerReflection' Storyboard.TargetProperty='Point' From='550,120' To='470,155' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line2_centerReflection' Storyboard.TargetProperty='Point' From='550,190' To='490,195' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line3_centerReflection' Storyboard.TargetProperty='Point' From='430,170' To='310,195' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='pathFigure_leftImg1' Storyboard.TargetProperty='StartPoint' From='330,5' To='250,15' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line1_leftImg1' Storyboard.TargetProperty='Point' From='470,5' To='370,25' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line2_leftImg1' Storyboard.TargetProperty='Point' From='470,145' To='370,95' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line3_leftImg1' Storyboard.TargetProperty='Point' From='330,145' To='250,115' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='pathFigure_left1Reflection' Storyboard.TargetProperty='StartPoint' From='330,155' To='250,120' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line1_left1Reflection' Storyboard.TargetProperty='Point' From='470,155' To='370,100' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line2_left1Reflection' Storyboard.TargetProperty='Point' From='490,195' To='370,170' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line3_left1Reflection' Storyboard.TargetProperty='Point' From='310,195' To='250,190' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='pathFigure_leftImg2' Storyboard.TargetProperty='StartPoint' From='250,15' To='180,15' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line1_leftImg2' Storyboard.TargetProperty='Point' From='370,25' To='300,25' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line2_leftImg2' Storyboard.TargetProperty='Point' From='370,95' To='300,95' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line3_leftImg2' Storyboard.TargetProperty='Point' From='250,115' To='180,115' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='pathFigure_left2Reflection' Storyboard.TargetProperty='StartPoint' From='250,120' To='180,120' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line1_left2Reflection' Storyboard.TargetProperty='Point' From='370,100' To='300,100' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line2_left2Reflection' Storyboard.TargetProperty='Point' From='370,170' To='300,170' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line3_left2Reflection' Storyboard.TargetProperty='Point' From='250,190' To='180,190' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='pathFigure_leftImg3' Storyboard.TargetProperty='StartPoint' From='180,15' To='130,15' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line1_leftImg3' Storyboard.TargetProperty='Point' From='300,25' To='250,25' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line2_leftImg3' Storyboard.TargetProperty='Point' From='300,95' To='250,95' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line3_leftImg3' Storyboard.TargetProperty='Point' From='180,115' To='130,115' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='pathFigure_left3Reflection' Storyboard.TargetProperty='StartPoint' From='180,120' To='130,120' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line1_left3Reflection' Storyboard.TargetProperty='Point' From='300,100' To='250,100' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line2_left3Reflection' Storyboard.TargetProperty='Point' From='300,170' To='250,170' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line3_left3Reflection' Storyboard.TargetProperty='Point' From='180,190' To='130,190' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='pathFigure_rightImg1' Storyboard.TargetProperty='StartPoint' From='500,25' To='430,25' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line1_rightImg1' Storyboard.TargetProperty='Point' From='620,15' To='550,15' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line2_rightImg1' Storyboard.TargetProperty='Point' From='620,115' To='550,115' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line3_rightImg1' Storyboard.TargetProperty='Point' From='500,95' To='430,95' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='pathFigure_right1Reflection' Storyboard.TargetProperty='StartPoint' From='500,100' To='430,100' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line1_right1Reflection' Storyboard.TargetProperty='Point' From='620,120' To='550,120' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line2_right1Reflection' Storyboard.TargetProperty='Point' From='620,190' To='550,190' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line3_right1Reflection' Storyboard.TargetProperty='Point' From='500,170' To='430,170' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='pathFigure_rightImg2' Storyboard.TargetProperty='StartPoint' From='550,25' To='500,25' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line1_rightImg2' Storyboard.TargetProperty='Point' From='670,15' To='620,15' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line2_rightImg2' Storyboard.TargetProperty='Point' From='670,115' To='620,115' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line3_rightImg2' Storyboard.TargetProperty='Point' From='550,95' To='500,95' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='pathFigure_right2Reflection' Storyboard.TargetProperty='StartPoint' From='550,100' To='500,100' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line1_right2Reflection' Storyboard.TargetProperty='Point' From='670,120' To='620,120' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line2_right2Reflection' Storyboard.TargetProperty='Point' From='670,190' To='620,190' Duration='0:0:0.5'/>
<PointAnimation Storyboard.TargetName='line3_right2Reflection' Storyboard.TargetProperty='Point' From='550,170' To='500,170' Duration='0:0:0.5'/>
</Storyboard>
上面的两块xaml代码分别操作UI元素(注意只有六组,而不是七组,因为整体动态效果用六组PATH对象移动即可实现)。
注:目前无法在BLEND下对两个StoryBoard的运行效果进行设计测试,也就是之前BLEND截图中箭头所指示的
"No StoryBoard Open",造成这个问题的原因目前我还不大清楚,有兴趣的朋友不妨也帮助分析一下原因。
到这里,页面上的图象展示元素和StoryBoard就介绍完了,当然还有两个按钮控件(RepeatButton类型)没有介绍,因为
其功能只是实现按钮事件触发Storyboard运行,而且有关Button按钮控件的类继承关系及设计原理我之前已写过一篇文章作
了一些介绍,大家参考一下即可。
好了,xaml内容介绍完了,下面介绍一下CS代码,首先是事件参数声明(详细内容见注释):
///
<summary>
///
ImageSelector事件参数
///
</summary>
public
class
ImageSelectedEventArgs : EventArgs
{
///
<summary>
///
当前选择的图片源信息
///
</summary>
public
string
Source;
///
<summary>
///
当前选择的图片位图对象
///
</summary>
public
BitmapImage ImageSource;
}
然后是选择图片时的事件处理句柄(关于使用参见接下来的代码):
///
<summary>
///
ImageSelected事件处理句柄
///
</summary>
///
<param name="sender"></param>
///
<param name="e"></param>
public
delegate
void
ImageSelectedEventHandler(
object
sender, ImageSelectedEventArgs e);
接着是控件的主体类了(详情见注释):
///
<summary>
///
ImageSelector控件类
///
</summary>
public
partial
class
ImageSelector : UserControl
{
///
<summary>
///
声明ImageSelected事件处理句柄的实例
///
</summary>
public
event
ImageSelectedEventHandler ImageSelected;
public
ImageSelector()
{
InitializeComponent();
//
图像刷数组初始化,用于绑定指定的BitmapImage信息
imageBrushArray
=
new
ImageBrush[
7
];
//
7为当前页图片数
imageBrushArray[
0
]
=
leftImg3Brush;
imageBrushArray[
1
]
=
leftImg2Brush;
imageBrushArray[
2
]
=
leftImg1Brush;
imageBrushArray[
3
]
=
centerImgBrush;
imageBrushArray[
4
]
=
rightImg1Brush;
imageBrushArray[
5
]
=
rightImg2Brush;
imageBrushArray[
6
]
=
rightImg3Brush;
//
“倒影效果”图像刷数组初始化,用于绑定指定的BitmapImage信息
reflectionBrushArray
=
new
ImageBrush[
7
];
//
7为当前页图片数
reflectionBrushArray[
0
]
=
leftReflection3Brush;
reflectionBrushArray[
1
]
=
leftReflection2Brush;
reflectionBrushArray[
2
]
=
leftReflection1Brush;
reflectionBrushArray[
3
]
=
centerReflectionBrush;
reflectionBrushArray[
4
]
=
rightReflection1Brush;
reflectionBrushArray[
5
]
=
rightReflection2Brush;
reflectionBrushArray[
6
]
=
rightReflection3Brush;
//
绑定鼠标点击图片(外侧Path对象)后的事件
leftImg3.MouseLeftButtonDown
+=
new
MouseButtonEventHandler(OnImgClicked);
leftImg2.MouseLeftButtonDown
+=
new
MouseButtonEventHandler(OnImgClicked);
leftImg1.MouseLeftButtonDown
+=
new
MouseButtonEventHandler(OnImgClicked);
rightImg3.MouseLeftButtonDown
+=
new
MouseButtonEventHandler(OnImgClicked);
rightImg2.MouseLeftButtonDown
+=
new
MouseButtonEventHandler(OnImgClicked);
rightImg1.MouseLeftButtonDown
+=
new
MouseButtonEventHandler(OnImgClicked);
centerImg.MouseLeftButtonDown
+=
new
MouseButtonEventHandler(OnImgClicked);
}
///
<summary>
///
定义图像点击事件
///
</summary>
///
<param name="sender"></param>
///
<param name="e"></param>
void
OnImgClicked(
object
sender, MouseButtonEventArgs e)
{
ImageSelectedEventArgs args
=
new
ImageSelectedEventArgs();
//
设置事件参数
args.ImageSource
=
((Path)sender).Fill.GetValue(ImageBrush.ImageSourceProperty)
as
BitmapImage;
//
调用图片选择事件
OnImageSelected(args);
}
///
<summary>
///
定义图片选择事件
///
</summary>
///
<param name="e"></param>
protected
void
OnImageSelected(ImageSelectedEventArgs e)
{
if
(ImageSelected
!=
null
)
{
//
调用绑定的处理事件代码
ImageSelected(
this
, e);
}
}
///
<summary>
///
实始化图像数组并绑定相应的图像Brush
///
</summary>
///
<param name="imageUris">
图片路径信息
</param>
public
void
SetImages(
string
[] imageUris)
{
imageArray
=
imageUris;
if
(imageArray.Length
>=
7
)
{
//
设置当前显示的图片数组的左起索引数
imageIndex
=
0
;
//
绑定相应的图像Brush
UpdateImages();
}
}
///
<summary>
///
定义“flowForward(前进)”对象(Storyboard类型) 的Completed处理事件
///
</summary>
///
<param name="sender"></param>
///
<param name="e"></param>
void
onForwardFlowCompleted(
object
sender, EventArgs e)
{
//
当storyboard动画效果完成时置为NULL
firstImgBrush.ImageSource
=
null
;
lastImgBrush.ImageSource
=
null
;
firstReflectionBrush.ImageSource
=
null
;
lastReflectionBrush.ImageSource
=
null
;
}
///
<summary>
///
定义“flowBackward(后退)”对象(Storyboard类型) 的Completed处理事件
///
</summary>
///
<param name="sender"></param>
///
<param name="e"></param>
void
onBackwardFlowCompleted(
object
sender, EventArgs e)
{
//
当storyboard动画效果完成时置为NULL
firstImgBrush.ImageSource
=
null
;
lastImgBrush.ImageSource
=
null
;
firstReflectionBrush.ImageSource
=
null
;
lastReflectionBrush.ImageSource
=
null
;
}
///
<summary>
///
“后退”按钮点击事件
///
</summary>
///
<param name="sender"></param>
///
<param name="e"></param>
void
btnBack_Click(
object
sender, EventArgs e)
{
if
(imageIndex
!=
-
1
)
{
//
更新最左侧图像刷和“倒影”对象,使其在下面storyboard运动过程中逐渐被遮盖
firstImgBrush.ImageSource = new BitmapImage(new Uri(imageArray[imageIndex],
UriKind.RelativeOrAbsolute));
firstReflectionBrush.ImageSource = new BitmapImage(new Uri(imageArray[imageIndex],
UriKind.RelativeOrAbsolute));
//
注:后退方向与我们通常认为的方向相反(通常是imageIndex--),这块不知道是作者的疏忽还是别的原因
imageIndex
++
;
if
(imageIndex
==
imageArray.Length)
{
imageIndex
=
0
;
}
UpdateImages();
//
运行"后退"storyboard效果
flowBackward.Begin();
}
}
///
<summary>
///
“前进”按钮点击事件
///
</summary>
///
<param name="sender"></param>
///
<param name="e"></param>
void
btnForward_Click(
object
sender, EventArgs e)
{
if
(imageIndex
!=
-
1
)
{
//
更新最右侧图像刷和“倒影”对象,使其在下面storyboard运动过程中逐渐被遮盖
lastImgBrush.ImageSource = new BitmapImage(new Uri(imageArray[(imageIndex + 6) %
imageArray.Length], UriKind.RelativeOrAbsolute));
lastReflectionBrush.ImageSource = new BitmapImage(new Uri(imageArray[(imageIndex + 6) %
imageArray.Length], UriKind.RelativeOrAbsolute));
//
注:前进方向与我们通常认为方向相反(通常是imageIndex++),这块不知道是作者的疏忽还是别的原因
imageIndex
--
;
if
(imageIndex
<
0
)
{
imageIndex
=
imageArray.Length
-
1
;
}
UpdateImages();
//
运行"前进"storyboard效果
flowForward.Begin();
}
}
///
<summary>
///
绑定相应的图像Brush
///
</summary>
void
UpdateImages()
{
int
brushIndex
=
imageIndex;
for
(
int
i
=
0
; i
<
7
; i
++
)
{
//
加载图像信息
imageBrushArray[i].ImageSource = new BitmapImage(new Uri(imageArray[brushIndex],
UriKind.RelativeOrAbsolute));
reflectionBrushArray[i].ImageSource = new BitmapImage(new Uri(imageArray[brushIndex],
UriKind.RelativeOrAbsolute));
brushIndex
++
;
//
当到达最大长度时,则清零(回到起始位置,实现循环效果)
if
(brushIndex
==
imageArray.Length)
{
brushIndex
=
0
;
}
}
}
///
<summary>
///
图像刷数组用于绑定(显示)指定的BitmapImage信息
///
</summary>
private
ImageBrush[] imageBrushArray;
///
<summary>
///
"倒影"效果图像刷数组
///
</summary>
private
ImageBrush[] reflectionBrushArray;
///
<summary>
///
图片路径信息数组
///
</summary>
private
string
[] imageArray;
///
<summary>
///
当前显示的图片数组的左起索引数
///
</summary>
private
int
imageIndex
=
-
1
;
}
上面的控件类主要是实现了初始化属性成员(图片数组)和相应UI元素事件的绑定(MouseLeftButtonDown),
然后是相应的事件处理代码(前进,后退按钮事件)。当然在实现上我个人认为还有一些问题(在注释中已说明)。
但总体上代码布局还是很清爽的。
下面即是本文开头DEMO页面的xaml代码(源码包中的Page3.xaml):
Code
<!--控件声明-->
<ctl:ImageSelector x:Name='imageSelector' ImageSelected='OnImageSelected' Canvas.Top='400' Loaded='imageSelector_Loaded'/>
<!--当用户点某一图片时显示元素-->
<InkPresenter x:Name="snipCanvas" Background="#80F5F5DC" Opacity="0" Canvas.Left="100" Canvas.Top="70" Width="600" Height="430" Cursor="Hand">
<InkPresenter.Resources>
<Storyboard x:Name="snipCanvasFadeIn">
<DoubleAnimation Storyboard.TargetName="snipCanvas" Storyboard.TargetProperty="Opacity" From="0.0" To="1.0" Duration='0:0:0.5'/>
<DoubleAnimation Storyboard.TargetName="snipCanvasScale" Storyboard.TargetProperty="ScaleX" From="0.0" To="1.0" Duration='0:0:0.5'/>
<DoubleAnimation Storyboard.TargetName="snipCanvasScale" Storyboard.TargetProperty="ScaleY" From="0.0" To="1.0" Duration='0:0:0.5'/>
</Storyboard>
<Storyboard x:Name="snipCanvasFadeOut">
<DoubleAnimation Storyboard.TargetName="snipCanvas" Storyboard.TargetProperty="Opacity" From="1.0" To="0.0" Duration='0:0:0.5'/>
<DoubleAnimation Storyboard.TargetName="snipCanvasScale" Storyboard.TargetProperty="ScaleX" From="1.0" To="0.0" Duration='0:0:0.5'/>
<DoubleAnimation Storyboard.TargetName="snipCanvasScale" Storyboard.TargetProperty="ScaleY" From="1.0" To="0.0" Duration='0:0:0.5'/>
</Storyboard>
</InkPresenter.Resources>
<InkPresenter.RenderTransform>
<ScaleTransform x:Name="snipCanvasScale" ScaleX="0.0" ScaleY="0.0" CenterX="300" CenterY="215"/>
</InkPresenter.RenderTransform>
<Canvas Canvas.Left="577" Canvas.Top="3" Width="20" Height="20" Background="Crimson" MouseLeftButtonUp="onExitMouseUp">
<Line X1="4" Y1="4" X2="16" Y2="16" Stroke="White" StrokeThickness="3" />
<Line X1="16" Y1="4" X2="4" Y2="16" Stroke="White" StrokeThickness="3" />
</Canvas>
<Image x:Name="snipImage" Canvas.Left="10" Canvas.Top="40"
Width="580" Height="380" Stretch="Uniform" />
</InkPresenter>
而相应的CS代码如下所示:
void
imageSelector_Loaded(
object
sender, RoutedEventArgs e)
{
string
baseUri
=
Application.Current.Host.Source.AbsoluteUri.Substring(
0
,
Application.Current.Host.Source.AbsoluteUri.LastIndexOf(
"
/
"
));
//
初始化设置图片链接数组
imageSelector.SetImages(
new
string
[]
{
String.Concat(baseUri,
"
/../Images/1.jpg
"
),
String.Concat(baseUri,
"
/../Images/2.jpg
"
),
String.Concat(baseUri,
"
/../Images/3.jpg
"
),
String.Concat(baseUri,
"
/../Images/4.jpg
"
),
String.Concat(baseUri,
"
/../Images/5.jpg
"
),
String.Concat(baseUri,
"
/../Images/6.jpg
"
),
String.Concat(baseUri,
"
/../Images/7.jpg
"
),
String.Concat(baseUri,
"
/../Images/8.jpg
"
)
});
}
void
OnImageSelected(
object
sender, ImageSelectedEventArgs e)
{
//
当选择某一图片时,放大显示
snipCanvas.Cursor
=
Cursors.Hand;
snipCanvasFadeIn.Begin();
snipImage.SetValue(Image.SourceProperty, e.ImageSource);
}
void
onExitMouseUp(
object
sender, MouseButtonEventArgs e)
{
//
当点击关闭时
snipCanvasFadeOut.Begin();
}
上面代码中的OnImageSelected用于单击某张图片时放大显示,如下图:
好了,今天的内容就先到这里了。
tag:silverlight,imageselector,imagesnipper
作者:代震军,daizhj
原文链接:http://www.cnblogs.com/daizhj/archive/2008/09/10/1288315.html
源码下载,请
点击这里:)