我是Windows Phone 8开发的新手(你可以说知情的noob寻找答案),我正在寻找以下问题的帮助:
我有 usercontrol - 更具体地说是按钮,其中包含图片和文字。我希望该按钮具有以下属性:
我现在拥有的是usercontrol在我的项目中添加到UserControls文件夹中,我可以使用它。我为它创建了一个样式并更改了禁用按钮的backgeround等。
我想知道什么:
(我将在我的程序中使用该按钮六次,我想使用此usercontrol作为它的一种模板 - 准备它,所以我只为这两种状态指定ImageSources,它将完成剩下的工作)
希望使用的示例:
<UserControls:MainPageButton ContentText="Log In" ContentImageNormal="/ImagePathOrResourceETC.png" ContentImageDisabled="/ImagePathOrResourceETC.png"/>
我有XAML:
<UserControl x:Class="ProjectNameSpace.UserControls.MainPageButton">
<Grid x:Name="LayoutRoot">
<Button >
<Button.Content>
<Grid>
...omitted...
<Image x:Name="ContentImageHolder" ... />
<TextBlock x:Name="ContentTextBlock" .../>
</Grid>
</Button.Content>
</Button>
</Grid>
</UserControl>
C#代码隐藏我目前有:
...usings omitted...
public partial class MainPageButton : UserControl
{
...constructor and text setting omitted for brevity...
public ImageSource ContentImage
{
get
{
return ContentImageHolder.Source;
}
set
{
ContentImageHolder.Source = value;
}
}
}
}
答案 0 :(得分:3)
这非常简单(嗯,这对我来说,因为我已经为大多数硬件提供了大量的片段),所以这里是一个自定义的UserControl。
首先,使用您的图片创建用户控件。耶。
<UserControl x:Class="CustomImageControl.Controls.ThreeWay"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008" >
<Image
x:Name="derpImage" />
</UserControl>
额外努力,那里。
接下来,在代码隐藏中,您必须执行以下操作。首先,为每种类型的图像创建DependencyProperties,表示您拥有的任何状态。在我的例子中,出于空间原因,我省略了InactiveImage和DerpImage属性。您可以看到ActiveImage的工作原理。接下来,为控件的状态创建DependencyProperty。在示例中,我有一个State枚举来定义它,但是你可以做任何你想做的事情。在更改时,我会检查新值并根据需要更改图像。容易。
public partial class ThreeWay : UserControl
{
#region ActiveImage
public static readonly DependencyProperty ActiveImageProperty =
DependencyProperty.Register(
"ActiveImage",
typeof(ImageSource),
typeof(ThreeWay),
new UIPropertyMetadata());
public ImageSource ActiveImage
{
get { return (ImageSource)GetValue(ActiveImageProperty); }
set { SetValue(ActiveImageProperty, value); }
}
#endregion
//InactiveImage and DerpImage snipped to keep this short
#region ImageState
public static readonly DependencyProperty ImageStateProperty =
DependencyProperty.Register(
"ImageState",
typeof(State),
typeof(ThreeWay),
new UIPropertyMetadata(State.Derp, OnImageStatePropertyChanged));
private static void OnImageStatePropertyChanged(
DependencyObject d, DependencyPropertyChangedEventArgs e)
{
(d as ThreeWay).OnImageStateChanged(
e.OldValue as State, e.NewValue as State);
}
private void OnImageStateChanged(State oldValue, State newValue)
{
switch(newValue)
{
case State.Active:
this.derpImage.Source = ActiveImage;
break;
case State.Inactive:
this.derpImage.Source = InactiveImage;
break;
case State.Derp:
this.derpImage.Source = DerpImage;
break;
}
}
public State ImageState
{
get { return (State)GetValue(ImageStateProperty); }
set { SetValue(ImageStateProperty, value); }
}
#endregion
public ThreeWay()
{
InitializeComponent();
}
public enum State
{
Active,
Inactive,
Derp
}
}
就是这样。你可以这样使用它:
<cc:ThreeWay xmlns:cc="clr-namespace:CustomImageControl.Controls"
ActiveImage="active.png"
InactiveImage="inactive.png"
DerpImage="derp.jpg"
ImageState="{Binding State}" />
这假设DataContext是一个具有State
类型ThreeWay.State
的属性的实例。如果没有,可以使用自定义转换器将任何(可空的bool?)转换为正确的类型。
答案 1 :(得分:2)
一月,
对于你的问题,你只是遗漏了一件事。
在UserControl中,你必须像这样创建DependencyProperties:
public static readonly DependencyProperty ContentImageNormalProperty =
DependencyProperty.Register("ContentImageNormal",
typeof(ImageSource ),
typeof(MainPageButton));
然后你的财产应该是这样的:
public string ContentImageNormal{ get { return (ImageSource)this.GetValue(ContentImageNormalProperty); }
set { this.SetValue(ContentImageNormalProperty, value); } }
为您要设置的每个媒体资源执行此操作...
请参阅此示例:http://stevenhollidge.blogspot.pt/2012/03/dependency-properties-in-user-control.html
我希望这会对你有所帮助。
此致 塞尔吉奥·蒙泰罗
答案 2 :(得分:2)
看起来你真正想做的是创建一个CustomControl而不是UserControl。所以我将创建一个继承自Button的自定义Control,并使用按钮可视状态在两个图像之间切换。这是一个实现: 在ThemeS / Generic.xaml中添加此样式
<Style TargetType="ButtonWithImage">
<Setter Property="Background" Value="Transparent"/>
<Setter Property="BorderBrush" Value="{StaticResource PhoneForegroundBrush}"/>
<Setter Property="Foreground" Value="{StaticResource PhoneForegroundBrush}"/>
<Setter Property="BorderThickness" Value="{StaticResource PhoneBorderThickness}"/>
<Setter Property="FontFamily" Value="{StaticResource PhoneFontFamilySemiBold}"/>
<Setter Property="FontSize" Value="{StaticResource PhoneFontSizeMedium}"/>
<Setter Property="Padding" Value="10,5,10,6"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Grid Background="Transparent">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal"/>
<VisualState x:Name="MouseOver"/>
<VisualState x:Name="Pressed">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentContainer">
<DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneButtonBasePressedForegroundBrush}"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="ButtonBackground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneAccentBrush}"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Disabled">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentContainer">
<DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneDisabledBrush}"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="ButtonBackground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneDisabledBrush}"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="ButtonBackground">
<DiscreteObjectKeyFrame KeyTime="0" Value="Transparent"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="enablebleImage">
<DiscreteObjectKeyFrame KeyTime="0" Value="Collapsed"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="disableImage">
<DiscreteObjectKeyFrame KeyTime="0" Value="Visible"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Border x:Name="ButtonBackground" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" CornerRadius="0" Margin="{StaticResource PhoneTouchTargetOverhang}">
<Grid>
<Image x:Name="disableImage" Source="{TemplateBinding EnableImageSource}" Visibility="Collapsed"/>
<Image x:Name="enablebleImage" Source="{TemplateBinding DisableImageSource}"/>
<ContentControl x:Name="ContentContainer" ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" Foreground="{TemplateBinding Foreground}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" Padding="{TemplateBinding Padding}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"/>
</Grid>
</Border>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
并定义以下类:
public class ButtonWithImage :Button
{
public static readonly DependencyProperty DisableImageSourceProperty =
DependencyProperty.Register("DisableImageSource", typeof (ImageSource), typeof (ButtonWithImage), new PropertyMetadata(default(ImageSource)));
public ImageSource DisableImageSource
{
get { return (ImageSource) GetValue(DisableImageSourceProperty); }
set { SetValue(DisableImageSourceProperty, value); }
}
public static readonly DependencyProperty EnableImageSourceProperty =
DependencyProperty.Register("EnableImageSource", typeof (ImageSource), typeof (ButtonWithImage), new PropertyMetadata(default(ImageSource)));
public ImageSource EnableImageSource
{
get { return (ImageSource) GetValue(EnableImageSourceProperty); }
set { SetValue(EnableImageSourceProperty, value); }
}
public ButtonWithImage()
{
this.DefaultStyleKey = typeof (Button);
}
}
答案 3 :(得分:1)
您可以对Image和Text进行简单的绑定。
对于你的例子:
<Button name="buttonTest">
<Button.Content>
<Grid>
...omitted...
<Image x:Name="ContentImageHolder" Source="{Binding ElementName=buttonTest, Path=IsEnabled, Converter ={StaticResource convertButton}}" Grid.Row="0" />
<TextBlock x:Name="ContentTextBlock" Text="My Sample Text" Grid.Row="1" FontSize="{StaticResource PhoneFontSizeNormal}" FontFamily="{StaticResource PhoneFontFamilyNormal}" Foreground="{StaticResource PhoneForegroundBrush}" TextAlignment="Center"/>
</Grid>
然后你会创建一个转换器,它将接收值为True或False(启用与否),然后在每个状态下返回所需的图像。
您的转换器可能类似
public class ButtonImageConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if((bool) value)
return CreateImage("pack://application:,,,/ButtonEnabled.ico"); // url should be correct
else return CreateImage("pack://application:,,,/ButtonDisable.ico");
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
return null;
}
/// <summary>
/// Method to create an image to bind to icons in treeview
/// </summary>
/// <param name="uriToImage">uri to image in folder.</param>
/// <returns>a bitmap image to bind to image source in tree view</returns>
private BitmapImage CreateImage(string uriToImage)
{
if (!string.IsNullOrEmpty(uriToImage))
{
BitmapImage genericBitmap = new BitmapImage();
genericBitmap.BeginInit();
genericBitmap.UriSource = new Uri(uriToImage);
genericBitmap.EndInit();
return genericBitmap;
}
return null;
}
}
对于Text,如果它依赖于任何属性,您也可以这样做。