我最終採用的解決方案是使用兩個項目 - 一個按鈕和一個圖像 - 每個項目都包含在一個邊框中,只允許其中一個項目可見,具體取決於位圖圖像是否可用:
<Border Background="{StaticResource ListViewItemPlaceholderBackgroundThemeBrush}" Width="250" Height="250" Visibility="{Binding ImageIsAvailable, Converter={StaticResource HideIfTrue}}">
<Button Content="{Binding ImageContent}" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="20,20,0,0" Style="{StaticResource UnstyledGraphicsButtonStyle}" Width="{Binding ImageWidth210}" Height="{Binding ImageHeight210}" Foreground="white" Padding="0" Background="Transparent" BorderBrush="{x:Null}" IsEnabled="False" />
</Border>
<Border Background="{StaticResource ListViewItemPlaceholderBackgroundThemeBrush}" Visibility="{Binding ImageIsAvailable, Converter={StaticResource DisplayIfTrue}}">
<Image Source="{Binding Image250}" Stretch="{Binding Stretch250}" AutomationProperties.Name="{Binding Title}" HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Border>
在這個例子中,我想要的項目是250px的250px。 Stretch的綁定使我可以處理大於和小於250px的圖像並相應地拉伸。
對於按鈕,內容實際上來自一個聲明的字符串資源,例如:
<x:String x:Key="building">M13.982995,32.651007L13.982995,37.332006 18.665994,37.332006 18.665994,32.651007z M5.3319988,32.440006L5.3319988,37.332006 10.225996,37.332006 10.225996,32.440006z M34.665606,29.33198L34.665606,37.313 37.332797,37.313 37.332797,29.33198z M29.332198,29.33198L29.332198,37.340984 31.999405,37.340984 31.999405,29.33198z M13.923995,24.000005L13.923995,28.740005 18.665994,28.740005 18.665994,24.000005z M5.3319988,24.000005L5.3319988,28.839005 10.171997,28.839005 10.171997,24.000005z M34.665606,18.665992L34.665606,26.684976 37.332797,26.684976 37.332797,18.665992z M29.332198,18.665992L29.332198,26.644998 31.999405,26.644998 31.999405,18.665992z M13.331995,16.000003L13.331995,18.666003 15.998995,18.666003 15.998995,16.000003z M7.9989967,16.000003L7.9989967,18.666003 10.665997,18.666003 10.665997,16.000003z M26.665998,13.331976L39.998998,13.331976 39.998998,42.666973 26.665998,42.666973z M13.331995,10.666002L13.331995,13.332002 15.998995,13.332002 15.998995,10.666002z M7.9989967,10.666002L7.9989967,13.332002 10.665997,13.332002 10.665997,10.666002z M10.665997,0L13.331995,0 13.331995,5.3340011 15.998995,5.3340011 18.665994,10.666002 18.665994,18.666003 21.331993,18.666003 23.998992,21.332004 23.998992,42.667007 0,42.667007 0,21.332004 2.6659985,18.666003 5.3319988,18.666003 5.3319988,10.666002 7.9969978,5.3340011 10.665997,5.3340011z</x:String>
這來自地鐵工作室。
高度和寬度綁定是因爲我的不同SVG項目具有不同的寬度&高度比,所以我綁定到代碼隱藏以返回所需大小的正確數字。遺憾的是,由於您無法傳遞參數,因此根據XAML的不同,我會針對不同的「XXX」值調用不同的「ImageHeightXXX」調用。
如何獲得定義的字符串的建議可以在這裏找到:http://www.jayway.com/2012/11/27/styling-windows-8-4-the-button/