wpf/mvvmを使用してPOSアプリケーションを開発しています。トランザクションライフサイクルの多くの部分で、バックグラウンドで領収書が印刷されます。他の例を使用して、バックグラウンドで問題なくレシートを生成および印刷しました。UserControlをバックグラウンドで印刷していますが、すべてが見栄えがします。
次に、コントロールのViewModelを作成して、印刷するトランザクションをロードできるようにしました。私は2つの基本的なテキストボックスから始めました-テキストヘッダー「ClientReceipt」とトップヘッダー「PrintedOn:MM / dd / yy hh:mmtt」。
これは、印刷ボタンを押したときにデバッガーがライフサイクルを表示する方法です。
- コントロールの新しいインスタンスを作成します。
- ViewModelの新しいインスタンスを作成します
- INPCプロパティのテキストを設定します
- コントロールでメジャーを実行して、目的のプレプリントサイズを取得します
- 印刷ダイアログをロードし、名前の印刷キューを取得します
- レシート用紙に合わせてコントロールのサイズを拡大縮小します(ImageAreaの幅はUCと同じに設定されているため、現在選択しているプリンターに合わせて拡大縮小する必要はありません)。
- 「新しい」スケーリングされた画像サイズに基づいてグリッドを再測定および配置します
- PrintDialog.PrintVisualを呼び出します-UserControlを送信します
- プリンターが領収書を吐き出します-データバインドされたテキストなし
- 次に、デバッガーがget{return_HeaderText;にステップインします。}コードの一部-コントロールがすでに印刷された後。
コントロールをパネルにロードして表示することなく、コントロールがプリンターに送信される前に、コントロールのデータバインディングを強制する方法はありますか?たとえば、クレジットカードをスワイプして、CCの詳細を尋ねる(またはスワイプする)小さなポップアップウィンドウから、背景に署名欄が付いたレシートを印刷できるようにしたいと思います。
これを達成するためのより良い方法はありますか?
PrintReceiptメソッド:
ClientReceiptView control = new ClientReceiptView(Message);
System.Windows.Controls.PrintDialog printDlg = new System.Windows.Controls.PrintDialog();
PrintQueue ReceiptPrinter = new LocalPrintServer().GetPrintQueue("CITIZEN CT-S310");
PrintCapabilities PC = ReceiptPrinter.GetPrintCapabilities();
printDlg.PrintQueue = ReceiptPrinter;
control.Measure(new Size(Double.PositiveInfinity, Double.PositiveInfinity));
Size PreGridSize = control.DesiredSize;
double Scale = Math.Min(PC.PageImageableArea.ExtentWidth / PreGridSize.Width, PC.PageImageableArea.ExtentHeight / PreGridSize.Height);
control.LayoutTransform = new System.Windows.Media.ScaleTransform(Scale, Scale);
Size PaperSize = new Size(PC.PageImageableArea.ExtentWidth, Math.Min(PC.PageImageableArea.ExtentHeight, PreGridSize.Height));
control.Measure(PaperSize);
Point ptGrid = new Point(PC.PageImageableArea.OriginWidth, PC.PageImageableArea.OriginHeight);
control.Arrange(new Rect(ptGrid, PaperSize));
printDlg.PrintVisual(control, "My App");
そして、ビューコンストラクター(引数付き)
public ClientReceiptView(string Header)
{
InitializeComponent();
vm = new ClientReceiptViewModel(Header);
this.DataContext = vm;
}
そしてViewModel:
public class ClientReceiptViewModel : ViewModelBase
{
#region Properties
private string _HeaderText;
public string HeaderText
{
get { return _HeaderText; }
set { _HeaderText = value; OnPropertyChanged("HeaderText"); }
}
private int _TripID;
public int TripID
{
get { return _TripID; }
set { _TripID = value; OnPropertyChanged("TripID"); }
}
private string _PrintedOn;
public string PrintedOn
{
get { return _PrintedOn; }
set { _PrintedOn = value; OnPropertyChanged("PrintedOn"); }
}
#endregion
public ClientReceiptViewModel(string Header)
{
HeaderText = Header;
TripID = 2220013;
PrintedOn = "Printed: " + DateTime.Now.ToString("MM/dd/yy hh:mm tt");
}
}
編集:OnPropertyChanged( "HeaderText")を中断して、Binding/Creationからスタックを呼び出します。
Namespace.Main.POS.Receipts.ClientReceiptViewModel.PrintedOn.set(string value) Line 38 C#
Namespace.Main.POS.Receipts.ClientReceiptViewModel.SetData(string Header) Line 79 + 0x4f bytes C#
Namespace.Main.POS.Receipts.ClientReceiptView.ClientReceiptView(string Header) Line 28 + 0x13 bytes C#
Namespace.Main.POS.Receipts.PrintReceipt.PrintClientReceipt(string Message) Line 12 + 0x1e bytes C#
Namespace.Main.MainWindowView.button1_Click(object sender, System.Windows.RoutedEventArgs e) Line 23 + 0xb bytes C#
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次に、printDlg.PrintVisual(control、 "My App");の後 が発行されると、レシートが印刷され、次にブレークポイントの呼び出しスタックがget {return _PrintedOn; }:
Namespace.Main.POS.Receipts.ClientReceiptViewModel.PrintedOn.get() Line 37 C#
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