使用前面我们自定义的combo box下来列表技术可以预览每种字体的显示效果。
图4.字体下拉列表
更多关于自定义字体的信息，你可以参考Tim Heuer写的一篇文章http://www.devx.com/RIA/link/38145）。
设计参数存储和检索
自然地，你会想到任何一个项目都能在它们之前的版本上进行改进，因此，在我们的案例中，也添加了一项新功能，允许用户保存设计参数，并在以后随时进行检索和调阅，当然，保存这些内容的仓库就是SQL Server数据库了。
在设计数据库结构时，考虑到用户以后检索存储的设计信息要比较简单，我们只使用一个表来存储所有信息如产品颜色，水印颜色，字体等）。
图5.存储设计参数的SQL Server表
弹出控制器Silverlight 2代码
＜!-- Popup to display stored links --＞
＜Popup x:Name="popDisplayStoredLinks"＞
＜Grid x:Name="grdDisplayStoredLinks" Background="#007799aa"＞
＜Grid.RowDefinitions＞
＜RowDefinition /＞
＜RowDefinition Height="Auto" /＞
＜RowDefinition /＞
＜/Grid.RowDefinitions＞
＜Grid.ColumnDefinitions＞
＜ColumnDefinition /＞
＜ColumnDefinition Width="Auto" /＞
＜ColumnDefinition /＞
＜/Grid.ColumnDefinitions＞
＜Border BorderBrush="Black" BorderThickness="2" Background="WhiteSmoke"
CornerRadius="15" Grid.Column="1"
Grid.Row="1"＞
＜StackPanel
Margin="8" Width="330" ＞
＜StackPanel
Orientation="Vertical"＞
＜TextBlock
Margin="5,5,0,5"
HorizontalAlignment="Center"
FontFamily="Comic Sans MS"
FontSize="22" ＞
Saved Designs for ＜/TextBlock＞
＜TextBlock
x:Name="txbDisplayStoredLinksUserID"
Margin="0,0,5,5"
HorizontalAlignment="Center"
FontFamily="Comic Sans MS"
FontSize="22"
Text="UserIDHere" /＞
＜/StackPanel＞
＜ListBox x:Name="lstSavedDesigns" SelectionChanged
="lstSavedDesigns_SelectionChanged"
MouseLeftButtonUp="lstSavedDesigns_MouseLeftButtonUp"
Margin="10" /＞
＜Button
x:Name="btnPopCancelDisplayStoredLinks"
Click="btnPopCancelDisplayStoredLinks_Click"
Margin="5"
Content="Cancel" Width="100"
HorizontalAlignment="Center" VerticalAlignment="Bottom" /＞
＜/StackPanel＞
＜/Border＞
＜/Grid＞
＜/Popup＞ }
//This popup window is triggered
by setting its IsOpen property to true
void webService_GetDesignsByUserIdCompleted(object
sender, CustomerDesignsServiceReference.GetDesigns
ByUserIdCompletedEventArgs e)
{
if (_dbOperationsStatus[e.UserState.ToString()] ==
_dbOperationStatus.Canceling)
{
_dbOperationsStatus[e.UserState.ToString()] =
_dbOperationStatus.Canceled;
}
else
{
try
{
RetrievalCircleAnimation.Stop();
brdWaitAnimationRetrieveStoredLinks.Opacity = 0;
m_dtDatabaseRetrievalTimeout.Stop();
//Check to see how many results have
been returned
//If no results, display an error message
in the existing form
if (e.Result.Length ＜ 1)
{
_dbOperationsStatus[e.UserState.ToString()] =
_dbOperationStatus.Selected;
txbRetrieveStoredLinksResults.Text = "No artwork
found for UserID "
+ txtRetrievalUserID.Text;
btnRetrieveStoredLinksMaskClose.Content = "Close";
return;
}
//If there is only one result, just display the
saved design immediately
else if (e.Result.Length == 1)
{
_dbOperationsStatus[e.UserState.ToString()] =
_dbOperationStatus.Selected;
RetrieveStoredLinksMask.Visibility = Visibility.Collapsed;
popRetrieveStoredLinks.IsOpen = false;
m_cdSavedDesigns = e.Result.ToList();
DisplaySavedDesign(0);
}
else if (e.Result.Length ＞ 1)
{
_dbOperationsStatus[e.UserState.ToString()] =
_dbOperationStatus.Selected;
//If there are multiple results, save each record to a
CustomerDesign object and put a link in the
Display Stored Links popup
RetrieveStoredLinksMask.Visibility = Visibility.Collapsed;
m_cdSavedDesigns = e.Result.ToList();
lstSavedDesigns.ItemsSource = m_cdSavedDesigns;
lstSavedDesigns.DisplayMemberPath = "DesignName";
popRetrieveStoredLinks.IsOpen = false;
popDisplayStoredLinks.VerticalOffset =
(MainImageViewer.ActualHeight / 2)
- (174 / 2) + HeaderImage.ActualHeight - 25;
popDisplayStoredLinks.HorizontalOffset =
(HeaderImage.ActualWidth / 2)
- (350 / 2);
popDisplayStoredLinks.IsOpen = true;
txbDisplayStoredLinksUserID.Text = e.Result[0].UserID.ToString();
}
}
catch (System.Exception ex)
{
_dbOperationsStatus[e.UserState.ToString()] = _dbOperationStatus.Failed;
txbRetrieveStoredLinksResults.Text = "An Error occurred while
retrieving your artwork. Please try again.";
btnRetrieveStoredLinksMaskClose.Content = "Close";
btnRetrieveStoredLinksMaskClose.Focus();
Console.WriteLine(ex.Message);
}
}
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