Instruções passo a passo: mapeando propriedades usando o elemento WindowsFormsHost
Este passo a passo mostra como usar a PropertyMap propriedade para mapear propriedades WPF para propriedades correspondentes em um controle Windows Forms hospedado.
As tarefas ilustradas neste passo a passo incluem:
Criação do projeto.
Definir o layout do aplicativo.
Definir um novo mapeamento de propriedade.
Remover um mapeamento de propriedade padrão.
Substituir um mapeamento de propriedade padrão.
Estender um mapeamento de propriedade padrão.
Quando terminar, você poderá mapear propriedades WPF para propriedades correspondentes em um controle hospedado do Windows Forms.
Pré-requisitos
Você precisará dos seguintes componentes para concluir este passo a passo:
- Visual Studio 2017
Criar e configurar o projeto
Crie um projeto de aplicativo WPF chamado
PropertyMappingWithWfhSample
.No Gerenciador de Soluções, adicione uma referência ao assembly WindowsFormsIntegration, chamado WindowsFormsIntegration.dll.
No Gerenciador de Soluções, adicione referências aos assemblies System.Drawing e System.Windows.Forms.
Definindo o layout do aplicativo
O aplicativo baseado em WPF usa o WindowsFormsHost elemento para hospedar um controle do Windows Forms.
Definir o layout do aplicativo
Abra Window1.xaml no WPF Designer.
Substitua o código existente pelo código a seguir.
<Window x:Class="PropertyMappingWithWfh.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="PropertyMappingWithWfh" Height="300" Width="300" Loaded="WindowLoaded"> <DockPanel Name="panel1" LastChildFill="True"> <WindowsFormsHost Name="wfHost" DockPanel.Dock="Left" SizeChanged="Window1_SizeChanged" FontSize="20" /> </DockPanel> </Window>
Abra Window1.xaml.cs no Editor de Código.
Na parte superior do arquivo, importe os seguintes namespaces.
using System.Drawing; using System.Drawing.Drawing2D; using System.Windows.Forms; using System.Windows.Forms.Integration;
Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms Imports System.Windows.Forms.Integration
Definindo um novo mapeamento de propriedade
O WindowsFormsHost elemento fornece vários mapeamentos de propriedade padrão. Você adiciona um novo mapeamento de propriedade chamando o Add método no WindowsFormsHost elemento PropertyMap.
Definir um novo mapeamento de propriedade
Copie o código a seguir para a definição da classe
Window1
.// The AddClipMapping method adds a custom // mapping for the Clip property. private void AddClipMapping() { wfHost.PropertyMap.Add( "Clip", new PropertyTranslator(OnClipChange)); } // The OnClipChange method assigns an elliptical clipping // region to the hosted control's Region property. private void OnClipChange(object h, String propertyName, object value) { WindowsFormsHost host = h as WindowsFormsHost; System.Windows.Forms.CheckBox cb = host.Child as System.Windows.Forms.CheckBox; if (cb != null) { cb.Region = this.CreateClipRegion(); } } // The Window1_SizeChanged method handles the window's // SizeChanged event. It calls the OnClipChange method explicitly // to assign a new clipping region to the hosted control. private void Window1_SizeChanged(object sender, SizeChangedEventArgs e) { this.OnClipChange(wfHost, "Clip", null); } // The CreateClipRegion method creates a Region from an // elliptical GraphicsPath. private Region CreateClipRegion() { GraphicsPath path = new GraphicsPath(); path.StartFigure(); path.AddEllipse(new System.Drawing.Rectangle( 0, 0, (int)wfHost.ActualWidth, (int)wfHost.ActualHeight ) ); path.CloseFigure(); return( new Region(path) ); }
' The AddClipMapping method adds a custom mapping ' for the Clip property. Private Sub AddClipMapping() wfHost.PropertyMap.Add( _ "Clip", _ New PropertyTranslator(AddressOf OnClipChange)) End Sub ' The OnClipChange method assigns an elliptical clipping ' region to the hosted control's Region property. Private Sub OnClipChange( _ ByVal h As Object, _ ByVal propertyName As String, _ ByVal value As Object) Dim host As WindowsFormsHost = h Dim cb As System.Windows.Forms.CheckBox = host.Child If cb IsNot Nothing Then cb.Region = Me.CreateClipRegion() End If End Sub ' The Window1_SizeChanged method handles the window's ' SizeChanged event. It calls the OnClipChange method explicitly ' to assign a new clipping region to the hosted control. Private Sub Window1_SizeChanged( _ ByVal sender As Object, _ ByVal e As SizeChangedEventArgs) Me.OnClipChange(wfHost, "Clip", Nothing) End Sub ' The CreateClipRegion method creates a Region from an ' elliptical GraphicsPath. Private Function CreateClipRegion() As [Region] Dim path As New GraphicsPath() path.StartFigure() path.AddEllipse(New System.Drawing.Rectangle( _ 0, _ 0, _ wfHost.ActualWidth, _ wfHost.ActualHeight)) path.CloseFigure() Return New [Region](path) End Function
O
AddClipMapping
método adiciona um novo mapeamento para a Clip propriedade.O
OnClipChange
método converte a propriedade para a Clip propriedade Windows FormsRegion .O
Window1_SizeChanged
método manipula o evento da SizeChanged janela e dimensiona a região de recorte para se ajustar à janela do aplicativo.
Removendo um mapeamento de propriedade padrão
Remova um mapeamento de propriedade padrão chamando o Remove método no WindowsFormsHost .PropertyMap
Remover um mapeamento de propriedade padrão
Copie o código a seguir para a definição da classe
Window1
.// The RemoveCursorMapping method deletes the default // mapping for the Cursor property. private void RemoveCursorMapping() { wfHost.PropertyMap.Remove("Cursor"); }
' The RemoveCursorMapping method deletes the default ' mapping for the Cursor property. Private Sub RemoveCursorMapping() wfHost.PropertyMap.Remove("Cursor") End Sub
O
RemoveCursorMapping
método exclui o mapeamento padrão para a Cursor propriedade.
Substituindo um mapeamento de propriedade padrão
Substitua um mapeamento de propriedade padrão removendo o mapeamento padrão e chamando o Add método no WindowsFormsHost .PropertyMap
Substituir um mapeamento de propriedade padrão
Copie o código a seguir para a definição da classe
Window1
.// The ReplaceFlowDirectionMapping method replaces the // default mapping for the FlowDirection property. private void ReplaceFlowDirectionMapping() { wfHost.PropertyMap.Remove("FlowDirection"); wfHost.PropertyMap.Add( "FlowDirection", new PropertyTranslator(OnFlowDirectionChange)); } // The OnFlowDirectionChange method translates a // Windows Presentation Foundation FlowDirection value // to a Windows Forms RightToLeft value and assigns // the result to the hosted control's RightToLeft property. private void OnFlowDirectionChange(object h, String propertyName, object value) { WindowsFormsHost host = h as WindowsFormsHost; System.Windows.FlowDirection fd = (System.Windows.FlowDirection)value; System.Windows.Forms.CheckBox cb = host.Child as System.Windows.Forms.CheckBox; cb.RightToLeft = (fd == System.Windows.FlowDirection.RightToLeft ) ? RightToLeft.Yes : RightToLeft.No; } // The cb_CheckedChanged method handles the hosted control's // CheckedChanged event. If the Checked property is true, // the flow direction is set to RightToLeft, otherwise it is // set to LeftToRight. private void cb_CheckedChanged(object sender, EventArgs e) { System.Windows.Forms.CheckBox cb = sender as System.Windows.Forms.CheckBox; wfHost.FlowDirection = ( cb.CheckState == CheckState.Checked ) ? System.Windows.FlowDirection.RightToLeft : System.Windows.FlowDirection.LeftToRight; }
' The ReplaceFlowDirectionMapping method replaces the ' default mapping for the FlowDirection property. Private Sub ReplaceFlowDirectionMapping() wfHost.PropertyMap.Remove("FlowDirection") wfHost.PropertyMap.Add( _ "FlowDirection", _ New PropertyTranslator(AddressOf OnFlowDirectionChange)) End Sub ' The OnFlowDirectionChange method translates a ' Windows Presentation Foundation FlowDirection value ' to a Windows Forms RightToLeft value and assigns ' the result to the hosted control's RightToLeft property. Private Sub OnFlowDirectionChange( _ ByVal h As Object, _ ByVal propertyName As String, _ ByVal value As Object) Dim host As WindowsFormsHost = h Dim fd As System.Windows.FlowDirection = _ CType(value, System.Windows.FlowDirection) Dim cb As System.Windows.Forms.CheckBox = host.Child cb.RightToLeft = IIf(fd = System.Windows.FlowDirection.RightToLeft, _ RightToLeft.Yes, _ RightToLeft.No) End Sub ' The cb_CheckedChanged method handles the hosted control's ' CheckedChanged event. If the Checked property is true, ' the flow direction is set to RightToLeft, otherwise it is ' set to LeftToRight. Private Sub cb_CheckedChanged( _ ByVal sender As Object, _ ByVal e As EventArgs) Dim cb As System.Windows.Forms.CheckBox = sender wfHost.FlowDirection = IIf(cb.CheckState = CheckState.Checked, _ System.Windows.FlowDirection.RightToLeft, _ System.Windows.FlowDirection.LeftToRight) End Sub
O
ReplaceFlowDirectionMapping
método substitui o mapeamento padrão para a FlowDirection propriedade.O
OnFlowDirectionChange
método converte a propriedade para a FlowDirection propriedade Windows FormsRightToLeft .O
cb_CheckedChanged
método manipula o CheckedChanged evento no CheckBox controle. Ele atribui a FlowDirection propriedade com base no valor da CheckState propriedade
Estendendo um mapeamento de propriedade padrão
Você pode usar um mapeamento de propriedade padrão e também estendê-lo com seu próprio mapeamento.
Estender um mapeamento de propriedade padrão
Copie o código a seguir para a definição da classe
Window1
.// The ExtendBackgroundMapping method adds a property // translator if a mapping already exists. private void ExtendBackgroundMapping() { if (wfHost.PropertyMap["Background"] != null) { wfHost.PropertyMap["Background"] += new PropertyTranslator(OnBackgroundChange); } } // The OnBackgroundChange method assigns a specific image // to the hosted control's BackgroundImage property. private void OnBackgroundChange(object h, String propertyName, object value) { WindowsFormsHost host = h as WindowsFormsHost; System.Windows.Forms.CheckBox cb = host.Child as System.Windows.Forms.CheckBox; ImageBrush b = value as ImageBrush; if (b != null) { cb.BackgroundImage = new System.Drawing.Bitmap(@"C:\WINDOWS\Santa Fe Stucco.bmp"); } }
' The ExtendBackgroundMapping method adds a property ' translator if a mapping already exists. Private Sub ExtendBackgroundMapping() If wfHost.PropertyMap("Background") IsNot Nothing Then wfHost.PropertyMap("Background") = PropertyTranslator.Combine( _ wfHost.PropertyMap("Background"), _ PropertyTranslator.CreateDelegate( _ GetType(PropertyTranslator), _ Me, _ "OnBackgroundChange")) End If End Sub ' The OnBackgroundChange method assigns a specific image ' to the hosted control's BackgroundImage property. Private Sub OnBackgroundChange(ByVal h As Object, ByVal propertyName As String, ByVal value As Object) Dim host As WindowsFormsHost = h Dim cb As System.Windows.Forms.CheckBox = host.Child Dim b As ImageBrush = value If Not (b Is Nothing) Then cb.BackgroundImage = New System.Drawing.Bitmap("C:\WINDOWS\Santa Fe Stucco.bmp") End If End Sub
O
ExtendBackgroundMapping
método adiciona um conversor de propriedade personalizada ao mapeamento de propriedade existente Background .O
OnBackgroundChange
método atribui uma imagem específica à propriedade do BackgroundImage controle hospedado. O métodoOnBackgroundChange
é chamado depois que o mapeamento de propriedade padrão é aplicado.
Inicializando seus mapeamentos de propriedades
Configure seus mapeamentos de propriedade chamando os métodos descritos anteriormente no Loaded manipulador de eventos.
Inicializar seus mapeamentos de propriedades
Copie o código a seguir para a definição da classe
Window1
.// The WindowLoaded method handles the Loaded event. // It enables Windows Forms visual styles, creates // a Windows Forms checkbox control, and assigns the // control as the child of the WindowsFormsHost element. // This method also modifies property mappings on the // WindowsFormsHost element. private void WindowLoaded(object sender, RoutedEventArgs e) { System.Windows.Forms.Application.EnableVisualStyles(); // Create a Windows Forms checkbox control and assign // it as the WindowsFormsHost element's child. System.Windows.Forms.CheckBox cb = new System.Windows.Forms.CheckBox(); cb.Text = "Windows Forms checkbox"; cb.Dock = DockStyle.Fill; cb.TextAlign = ContentAlignment.MiddleCenter; cb.CheckedChanged += new EventHandler(cb_CheckedChanged); wfHost.Child = cb; // Replace the default mapping for the FlowDirection property. this.ReplaceFlowDirectionMapping(); // Remove the mapping for the Cursor property. this.RemoveCursorMapping(); // Add the mapping for the Clip property. this.AddClipMapping(); // Add another mapping for the Background property. this.ExtendBackgroundMapping(); // Cause the OnFlowDirectionChange delegate to be called. wfHost.FlowDirection = System.Windows.FlowDirection.LeftToRight; // Cause the OnClipChange delegate to be called. wfHost.Clip = new RectangleGeometry(); // Cause the OnBackgroundChange delegate to be called. wfHost.Background = new ImageBrush(); }
' The WindowLoaded method handles the Loaded event. ' It enables Windows Forms visual styles, creates ' a Windows Forms checkbox control, and assigns the ' control as the child of the WindowsFormsHost element. ' This method also modifies property mappings on the ' WindowsFormsHost element. Private Sub WindowLoaded( _ ByVal sender As Object, _ ByVal e As RoutedEventArgs) System.Windows.Forms.Application.EnableVisualStyles() ' Create a Windows Forms checkbox control and assign ' it as the WindowsFormsHost element's child. Dim cb As New System.Windows.Forms.CheckBox() cb.Text = "Windows Forms checkbox" cb.Dock = DockStyle.Fill cb.TextAlign = ContentAlignment.MiddleCenter AddHandler cb.CheckedChanged, AddressOf cb_CheckedChanged wfHost.Child = cb ' Replace the default mapping for the FlowDirection property. Me.ReplaceFlowDirectionMapping() ' Remove the mapping for the Cursor property. Me.RemoveCursorMapping() ' Add the mapping for the Clip property. Me.AddClipMapping() ' Add another mapping for the Background property. Me.ExtendBackgroundMapping() ' Cause the OnFlowDirectionChange delegate to be called. wfHost.FlowDirection = System.Windows.FlowDirection.LeftToRight ' Cause the OnClipChange delegate to be called. wfHost.Clip = New RectangleGeometry() ' Cause the OnBackgroundChange delegate to be called. wfHost.Background = New ImageBrush() End Sub
O
WindowLoaded
método manipula o Loaded evento e executa a inicialização a seguir.Cria um controle Windows FormsCheckBox .
Chama os métodos definidos anteriormente no passo a passo para configurar os mapeamentos de propriedade.
Atribui valores iniciais para as propriedades mapeadas.
Pressione F5 para compilar e executar o aplicativo. Clique na caixa de seleção para ver o FlowDirection efeito do mapeamento. Ao clicar na caixa de seleção, o layout inverte sua orientação esquerda-direita.
Confira também
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