Porady: wybrać atrament w niestandardowej kontrolce
Dodając kontrolkę IncrementalLassoHitTester niestandardową, możesz włączyć kontrolkę, aby użytkownik mógł wybrać atrament za pomocą narzędzia lasso, podobnie jak w przypadku InkCanvas wybierania pisma odręcznego z lasso.
W tym przykładzie przyjęto założenie, że wiesz już, jak utworzyć kontrolkę niestandardową z obsługą pisma od ręcznego. Aby utworzyć kontrolkę niestandardową, która akceptuje dane wejściowe pisma oddyskowego, zobacz Tworzenie kontrolki wejściowej pisma odk.
Przykład
Gdy użytkownik rysuje lasso, przewiduje, IncrementalLassoHitTester które pociągnięcia będą mieścić się w granicach ścieżki lasso po zakończeniu lasso. Udary, które są określane jako znajdujące się w granicach ścieżki lasso, można traktować jako wybrane. Wybrane pociągnięcia mogą również stać się niezaznaczone. Jeśli na przykład użytkownik odwraca kierunek podczas rysowania lasso, IncrementalLassoHitTester może usunąć zaznaczenie niektórych pociągnięć.
SelectionChanged Zgłasza IncrementalLassoHitTester zdarzenie, które umożliwia odpowiedź kontrolki niestandardowej, gdy użytkownik rysuje lasso. Można na przykład zmienić wygląd pociągnięć, gdy użytkownik wybiera i usuwa ich zaznaczenie.
Zarządzanie trybem pisma odręcznego
Jest to przydatne dla użytkownika, jeśli lasso pojawia się inaczej niż atrament w kontrolce. Aby to osiągnąć, kontrolka niestandardowa musi śledzić, czy użytkownik pisze, czy wybiera pismo odwłoczne. Najprostszym sposobem na to jest zadeklarowanie wyliczenia z dwiema wartościami: jeden wskazujący, że użytkownik pisze pismo odwłoczne i jeden, aby wskazać, że użytkownik wybiera pismo odwłoczne.
// Enum that keeps track of whether StrokeCollectionDemo is in ink mode
// or select mode.
public enum InkMode
{
Ink, Select
}
' Enum that keeps track of whether StrokeCollectionDemo is in ink mode
' or select mode.
Public Enum InkMode
Ink
[Select]
End Enum 'InkMode
Następnie dodaj dwa DrawingAttributes do klasy: jeden do użycia, gdy użytkownik zapisuje atrament, jeden do użycia, gdy użytkownik wybierze atrament. W konstruktorze zainicjuj DrawingAttributes i dołącz oba AttributeChanged zdarzenia do tej samej procedury obsługi zdarzeń. Następnie ustaw DrawingAttributes właściwość na DynamicRenderer atrament DrawingAttributes.
DrawingAttributes inkDA;
DrawingAttributes selectDA;
Private inkDA As DrawingAttributes
Private selectDA As DrawingAttributes
// In the constructor.
// Selection drawing attributes use dark gray ink.
selectDA = new DrawingAttributes();
selectDA.Color = Colors.DarkGray;
// ink drawing attributes use default attributes
inkDA = new DrawingAttributes();
inkDA.Width = 5;
inkDA.Height = 5;
inkDA.AttributeChanged += new PropertyDataChangedEventHandler(DrawingAttributesChanged);
selectDA.AttributeChanged += new PropertyDataChangedEventHandler(DrawingAttributesChanged);
' In the constructor.
' Selection drawing attributes use dark gray ink.
selectDA = New DrawingAttributes()
selectDA.Color = Colors.DarkGray
' ink drawing attributes use default attributes
inkDA = New DrawingAttributes()
inkDA.Width = 5
inkDA.Height = 5
AddHandler inkDA.AttributeChanged, _
AddressOf DrawingAttributesChanged
AddHandler selectDA.AttributeChanged, _
AddressOf DrawingAttributesChanged
Dodaj właściwość uwidaczniającą tryb wyboru. Gdy użytkownik zmieni tryb wyboru, ustaw DrawingAttributes właściwość obiektu na odpowiedni DrawingAttributes obiekt, a następnie ponownie dołącz RootVisual właściwość DynamicRenderer do InkPresenterwłaściwości .
// Property to indicate whether the user is inputting or
// selecting ink.
public InkMode Mode
{
get
{
return mode;
}
set
{
mode = value;
// Set the DrawingAttributes of the DynamicRenderer
if (mode == InkMode.Ink)
{
renderer.DrawingAttributes = inkDA;
}
else
{
renderer.DrawingAttributes = selectDA;
}
// Reattach the visual of the DynamicRenderer to the InkPresenter.
presenter.DetachVisuals(renderer.RootVisual);
presenter.AttachVisuals(renderer.RootVisual, renderer.DrawingAttributes);
}
}
' Property to indicate whether the user is inputting or
' selecting ink.
Public Property Mode() As InkMode
Get
Return Mode
End Get
Set(ByVal value As InkMode)
modeState = value
' Set the DrawingAttributes of the DynamicRenderer
If modeState = InkMode.Ink Then
renderer.DrawingAttributes = inkDA
Else
renderer.DrawingAttributes = selectDA
End If
' Reattach the visual of the DynamicRenderer to the InkPresenter.
presenter.DetachVisuals(renderer.RootVisual)
presenter.AttachVisuals(renderer.RootVisual, renderer.DrawingAttributes)
End Set
End Property
Uwidocznij DrawingAttributes jako właściwości, aby aplikacje mogły określić wygląd pociągnięć pisma odwłocznego i pociągnięć zaznaczenia.
// Property to allow the user to change the pen's DrawingAttributes.
public DrawingAttributes InkDrawingAttributes
{
get
{
return inkDA;
}
}
// Property to allow the user to change the Selector'newStroke DrawingAttributes.
public DrawingAttributes SelectDrawingAttributes
{
get
{
return selectDA;
}
}
' Property to allow the user to change the pen's DrawingAttributes.
Public ReadOnly Property InkDrawingAttributes() As DrawingAttributes
Get
Return inkDA
End Get
End Property
' Property to allow the user to change the Selector'newStroke DrawingAttributes.
Public ReadOnly Property SelectDrawingAttributes() As DrawingAttributes
Get
Return selectDA
End Get
End Property
Gdy właściwość DrawingAttributes obiektu ulegnie zmianie, RootVisual element musi zostać ponownie dołączony do obiektu InkPresenter. W procedurze AttributeChanged obsługi zdarzeń dla zdarzenia ponownie dołącz element RootVisual do elementu InkPresenter.
void DrawingAttributesChanged(object sender, PropertyDataChangedEventArgs e)
{
// Reattach the visual of the DynamicRenderer to the InkPresenter
// whenever the DrawingAttributes change.
presenter.DetachVisuals(renderer.RootVisual);
presenter.AttachVisuals(renderer.RootVisual, renderer.DrawingAttributes);
}
Private Sub DrawingAttributesChanged(ByVal sender As Object, _
ByVal e As PropertyDataChangedEventArgs)
' Reattach the visual of the DynamicRenderer to the InkPresenter
' whenever the DrawingAttributes change.
presenter.DetachVisuals(renderer.RootVisual)
presenter.AttachVisuals(renderer.RootVisual, _
renderer.DrawingAttributes)
End Sub
Korzystanie z incrementalLassoHitTester
Utwórz i zainicjuj obiekt StrokeCollection zawierający wybrane pociągnięcia.
// StylusPointCollection that collects the stylus points from the stylus events.
StylusPointCollection stylusPoints;
' StylusPointCollection that collects the stylus points from the stylus events.
Private stylusPoints As StylusPointCollection
Gdy użytkownik zacznie rysować pociągnięcie, atrament lub lasso, usuń zaznaczenie zaznaczonych pociągnięć. Następnie, jeśli użytkownik rysuje lasso, utwórz obiekt IncrementalLassoHitTester przez wywołanie GetIncrementalLassoHitTester, zasubskrybuj SelectionChanged zdarzenie i wywołaj metodę AddPoints. Ten kod może być oddzielną metodą i wywoływaną z OnStylusDown metod i OnMouseDown .
private void InitializeHitTester(StylusPointCollection collectedPoints)
{
// Deselect any selected strokes.
foreach (Stroke selectedStroke in selectedStrokes)
{
selectedStroke.DrawingAttributes.Color = inkDA.Color;
}
selectedStrokes.Clear();
if (mode == InkMode.Select)
{
// Remove the previously drawn lasso, if it exists.
if (lassoPath != null)
{
presenter.Strokes.Remove(lassoPath);
lassoPath = null;
}
selectionTester =
presenter.Strokes.GetIncrementalLassoHitTester(80);
selectionTester.SelectionChanged +=
new LassoSelectionChangedEventHandler(selectionTester_SelectionChanged);
selectionTester.AddPoints(collectedPoints);
}
}
Private Sub InitializeHitTester(ByVal collectedPoints As StylusPointCollection)
' Deselect any selected strokes.
Dim selectedStroke As Stroke
For Each selectedStroke In selectedStrokes
selectedStroke.DrawingAttributes.Color = inkDA.Color
Next selectedStroke
selectedStrokes.Clear()
If modeState = InkMode.Select Then
' Remove the previously drawn lasso, if it exists.
If Not (lassoPath Is Nothing) Then
presenter.Strokes.Remove(lassoPath)
lassoPath = Nothing
End If
selectionTester = presenter.Strokes.GetIncrementalLassoHitTester(80)
AddHandler selectionTester.SelectionChanged, AddressOf selectionTester_SelectionChanged
selectionTester.AddPoints(collectedPoints)
End If
End Sub
Dodaj rysik wskazujący, IncrementalLassoHitTester gdy użytkownik rysuje lasso. Wywołaj następującą metodę z OnStylusMovemetod , OnStylusUp, OnMouseMovei OnMouseLeftButtonUp .
private void AddPointsToHitTester(StylusPointCollection collectedPoints)
{
if (mode == InkMode.Select &&
selectionTester != null &&
selectionTester.IsValid)
{
// When the control is selecting strokes, add the
// stylus packetList to selectionTester.
selectionTester.AddPoints(collectedPoints);
}
}
Private Sub AddPointsToHitTester(ByVal collectedPoints As StylusPointCollection)
If modeState = InkMode.Select AndAlso _
Not selectionTester Is Nothing AndAlso _
selectionTester.IsValid Then
' When the control is selecting strokes, add the
' stylus packetList to selectionTester.
selectionTester.AddPoints(collectedPoints)
End If
End Sub
IncrementalLassoHitTester.SelectionChanged Obsłuż zdarzenie, aby odpowiedzieć, gdy użytkownik wybierze i anuluje zaznaczenie pociągnięć. Klasa LassoSelectionChangedEventArgs ma SelectedStrokes właściwości i DeselectedStrokes , które pobierają odpowiednio wybrane i niezaznaczone pociągnięcia.
void selectionTester_SelectionChanged(object sender,
LassoSelectionChangedEventArgs args)
{
// Change the color of all selected strokes to red.
foreach (Stroke selectedStroke in args.SelectedStrokes)
{
selectedStroke.DrawingAttributes.Color = Colors.Red;
selectedStrokes.Add(selectedStroke);
}
// Change the color of all unselected strokes to
// their original color.
foreach (Stroke unselectedStroke in args.DeselectedStrokes)
{
unselectedStroke.DrawingAttributes.Color = inkDA.Color;
selectedStrokes.Remove(unselectedStroke);
}
}
Private Sub selectionTester_SelectionChanged(ByVal sender As Object, _
ByVal args As LassoSelectionChangedEventArgs)
' Change the color of all selected strokes to red.
Dim selectedStroke As Stroke
For Each selectedStroke In args.SelectedStrokes
selectedStroke.DrawingAttributes.Color = Colors.Red
selectedStrokes.Add(selectedStroke)
Next selectedStroke
' Change the color of all unselected strokes to
' their original color.
Dim unselectedStroke As Stroke
For Each unselectedStroke In args.DeselectedStrokes
unselectedStroke.DrawingAttributes.Color = inkDA.Color
selectedStrokes.Remove(unselectedStroke)
Next unselectedStroke
End Sub
Gdy użytkownik zakończy rysowanie lasso, anuluj subskrypcję zdarzenia i wywołaj metodę SelectionChangedEndHitTesting.
if (mode == InkMode.Select && lassoPath == null)
{
// Add the lasso to the InkPresenter and add the packetList
// to selectionTester.
lassoPath = newStroke;
lassoPath.DrawingAttributes = selectDA.Clone();
presenter.Strokes.Add(lassoPath);
selectionTester.SelectionChanged -= new LassoSelectionChangedEventHandler
(selectionTester_SelectionChanged);
selectionTester.EndHitTesting();
}
If modeState = InkMode.Select AndAlso lassoPath Is Nothing Then
' Add the lasso to the InkPresenter and add the packetList
' to selectionTester.
lassoPath = newStroke
lassoPath.DrawingAttributes = selectDA.Clone()
presenter.Strokes.Add(lassoPath)
RemoveHandler selectionTester.SelectionChanged, _
AddressOf selectionTester_SelectionChanged
selectionTester.EndHitTesting()
End If
Łączenie tego wszystkiego.
W poniższym przykładzie przedstawiono kontrolkę niestandardową, która umożliwia użytkownikowi wybieranie pisma odkowego z lasso.
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Input;
using System.Windows.Input.StylusPlugIns;
using System.Windows.Ink;
// Enum that keeps track of whether StrokeCollectionDemo is in ink mode
// or select mode.
public enum InkMode
{
Ink, Select
}
// This control allows the user to input and select ink. When the
// user selects ink, the lasso remains visible until they erase, or clip
// the selected strokes, or clear the selection. When the control is
// in selection mode, strokes that are selected turn red.
public class InkSelector : Label
{
InkMode mode;
DrawingAttributes inkDA;
DrawingAttributes selectDA;
InkPresenter presenter;
IncrementalLassoHitTester selectionTester;
StrokeCollection selectedStrokes = new StrokeCollection();
// StylusPointCollection that collects the stylus points from the stylus events.
StylusPointCollection stylusPoints;
// Stroke that represents the lasso.
Stroke lassoPath;
DynamicRenderer renderer;
public InkSelector()
{
mode = InkMode.Ink;
// Use an InkPresenter to display the strokes on the custom control.
presenter = new InkPresenter();
this.Content = presenter;
// In the constructor.
// Selection drawing attributes use dark gray ink.
selectDA = new DrawingAttributes();
selectDA.Color = Colors.DarkGray;
// ink drawing attributes use default attributes
inkDA = new DrawingAttributes();
inkDA.Width = 5;
inkDA.Height = 5;
inkDA.AttributeChanged += new PropertyDataChangedEventHandler(DrawingAttributesChanged);
selectDA.AttributeChanged += new PropertyDataChangedEventHandler(DrawingAttributesChanged);
// Add a DynmaicRenderer to the control so ink appears
// to "flow" from the tablet pen.
renderer = new DynamicRenderer();
renderer.DrawingAttributes = inkDA;
this.StylusPlugIns.Add(renderer);
presenter.AttachVisuals(renderer.RootVisual,
renderer.DrawingAttributes);
}
static InkSelector()
{
// Allow ink to be drawn only within the bounds of the control.
Type owner = typeof(InkSelector);
ClipToBoundsProperty.OverrideMetadata(owner,
new FrameworkPropertyMetadata(true));
}
// Prepare to collect stylus packets. If Mode is set to Select,
// get the IncrementalHitTester from the InkPresenter'newStroke
// StrokeCollection and subscribe to its StrokeHitChanged event.
protected override void OnStylusDown(StylusDownEventArgs e)
{
base.OnStylusDown(e);
Stylus.Capture(this);
// Create a new StylusPointCollection using the StylusPointDescription
// from the stylus points in the StylusDownEventArgs.
stylusPoints = new StylusPointCollection();
StylusPointCollection eventPoints = e.GetStylusPoints(this, stylusPoints.Description);
stylusPoints.Add(eventPoints);
InitializeHitTester(eventPoints);
}
protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
{
base.OnMouseLeftButtonDown(e);
Mouse.Capture(this);
if (e.StylusDevice != null)
{
return;
}
Point pt = e.GetPosition(this);
StylusPointCollection collectedPoints = new StylusPointCollection(new Point[] { pt });
stylusPoints = new StylusPointCollection();
stylusPoints.Add(collectedPoints);
InitializeHitTester(collectedPoints);
}
private void InitializeHitTester(StylusPointCollection collectedPoints)
{
// Deselect any selected strokes.
foreach (Stroke selectedStroke in selectedStrokes)
{
selectedStroke.DrawingAttributes.Color = inkDA.Color;
}
selectedStrokes.Clear();
if (mode == InkMode.Select)
{
// Remove the previously drawn lasso, if it exists.
if (lassoPath != null)
{
presenter.Strokes.Remove(lassoPath);
lassoPath = null;
}
selectionTester =
presenter.Strokes.GetIncrementalLassoHitTester(80);
selectionTester.SelectionChanged +=
new LassoSelectionChangedEventHandler(selectionTester_SelectionChanged);
selectionTester.AddPoints(collectedPoints);
}
}
// Collect the stylus packets as the stylus moves.
protected override void OnStylusMove(StylusEventArgs e)
{
if (stylusPoints == null)
{
return;
}
StylusPointCollection collectedPoints = e.GetStylusPoints(this, stylusPoints.Description);
stylusPoints.Add(collectedPoints);
AddPointsToHitTester(collectedPoints);
}
protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMouseMove(e);
if (e.StylusDevice != null)
{
return;
}
if (e.LeftButton == MouseButtonState.Released)
{
return;
}
stylusPoints ??= new StylusPointCollection();
Point pt = e.GetPosition(this);
StylusPointCollection collectedPoints = new StylusPointCollection(new Point[] { pt });
stylusPoints.Add(collectedPoints);
AddPointsToHitTester(collectedPoints);
}
private void AddPointsToHitTester(StylusPointCollection collectedPoints)
{
if (mode == InkMode.Select &&
selectionTester != null &&
selectionTester.IsValid)
{
// When the control is selecting strokes, add the
// stylus packetList to selectionTester.
selectionTester.AddPoints(collectedPoints);
}
}
// When the user lifts the stylus, create a Stroke from the
// collected stylus points and add it to the InkPresenter.
// When the control is selecting strokes, add the
// point data to the IncrementalHitTester.
protected override void OnStylusUp(StylusEventArgs e)
{
stylusPoints ??= new StylusPointCollection();
StylusPointCollection collectedPoints =
e.GetStylusPoints(this, stylusPoints.Description);
stylusPoints.Add(collectedPoints);
AddPointsToHitTester(collectedPoints);
AddStrokeToPresenter();
stylusPoints = null;
Stylus.Capture(null);
}
protected override void OnMouseLeftButtonUp(MouseButtonEventArgs e)
{
base.OnMouseLeftButtonUp(e);
if (e.StylusDevice != null) return;
if (stylusPoints == null) stylusPoints = new StylusPointCollection();
Point pt = e.GetPosition(this);
StylusPointCollection collectedPoints = new StylusPointCollection(new Point[] { pt });
stylusPoints.Add(collectedPoints);
AddPointsToHitTester(collectedPoints);
AddStrokeToPresenter();
stylusPoints = null;
Mouse.Capture(null);
}
private void AddStrokeToPresenter()
{
Stroke newStroke = new Stroke(stylusPoints);
if (mode == InkMode.Ink)
{
// Add the stroke to the InkPresenter.
newStroke.DrawingAttributes = inkDA.Clone();
presenter.Strokes.Add(newStroke);
}
if (mode == InkMode.Select && lassoPath == null)
{
// Add the lasso to the InkPresenter and add the packetList
// to selectionTester.
lassoPath = newStroke;
lassoPath.DrawingAttributes = selectDA.Clone();
presenter.Strokes.Add(lassoPath);
selectionTester.SelectionChanged -= new LassoSelectionChangedEventHandler
(selectionTester_SelectionChanged);
selectionTester.EndHitTesting();
}
}
void selectionTester_SelectionChanged(object sender,
LassoSelectionChangedEventArgs args)
{
// Change the color of all selected strokes to red.
foreach (Stroke selectedStroke in args.SelectedStrokes)
{
selectedStroke.DrawingAttributes.Color = Colors.Red;
selectedStrokes.Add(selectedStroke);
}
// Change the color of all unselected strokes to
// their original color.
foreach (Stroke unselectedStroke in args.DeselectedStrokes)
{
unselectedStroke.DrawingAttributes.Color = inkDA.Color;
selectedStrokes.Remove(unselectedStroke);
}
}
// Property to indicate whether the user is inputting or
// selecting ink.
public InkMode Mode
{
get
{
return mode;
}
set
{
mode = value;
// Set the DrawingAttributes of the DynamicRenderer
if (mode == InkMode.Ink)
{
renderer.DrawingAttributes = inkDA;
}
else
{
renderer.DrawingAttributes = selectDA;
}
// Reattach the visual of the DynamicRenderer to the InkPresenter.
presenter.DetachVisuals(renderer.RootVisual);
presenter.AttachVisuals(renderer.RootVisual, renderer.DrawingAttributes);
}
}
void DrawingAttributesChanged(object sender, PropertyDataChangedEventArgs e)
{
// Reattach the visual of the DynamicRenderer to the InkPresenter
// whenever the DrawingAttributes change.
presenter.DetachVisuals(renderer.RootVisual);
presenter.AttachVisuals(renderer.RootVisual, renderer.DrawingAttributes);
}
// Property to allow the user to change the pen's DrawingAttributes.
public DrawingAttributes InkDrawingAttributes
{
get
{
return inkDA;
}
}
// Property to allow the user to change the Selector'newStroke DrawingAttributes.
public DrawingAttributes SelectDrawingAttributes
{
get
{
return selectDA;
}
}
}
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Media
Imports System.Windows.Input
Imports System.Windows.Input.StylusPlugIns
Imports System.Windows.Ink
' Enum that keeps track of whether StrokeCollectionDemo is in ink mode
' or select mode.
Public Enum InkMode
Ink
[Select]
End Enum 'InkMode
' This control allows the user to input and select ink. When the
' user selects ink, the lasso remains visible until they erase, or clip
' the selected strokes, or clear the selection. When the control is
' in selection mode, strokes that are selected turn red.
Public Class InkSelector
Inherits Label
Private modeState As InkMode
Private inkDA As DrawingAttributes
Private selectDA As DrawingAttributes
Private presenter As InkPresenter
Private selectionTester As IncrementalLassoHitTester
Private selectedStrokes As New StrokeCollection()
' StylusPointCollection that collects the stylus points from the stylus events.
Private stylusPoints As StylusPointCollection
' Stroke that represents the lasso.
Private lassoPath As Stroke
Private renderer As DynamicRenderer
Public Sub New()
modeState = InkMode.Ink
' Use an InkPresenter to display the strokes on the custom control.
presenter = New InkPresenter()
Me.Content = presenter
' In the constructor.
' Selection drawing attributes use dark gray ink.
selectDA = New DrawingAttributes()
selectDA.Color = Colors.DarkGray
' ink drawing attributes use default attributes
inkDA = New DrawingAttributes()
inkDA.Width = 5
inkDA.Height = 5
AddHandler inkDA.AttributeChanged, _
AddressOf DrawingAttributesChanged
AddHandler selectDA.AttributeChanged, _
AddressOf DrawingAttributesChanged
' Add a DynmaicRenderer to the control so ink appears
' to "flow" from the tablet pen.
renderer = New DynamicRenderer()
renderer.DrawingAttributes = inkDA
Me.StylusPlugIns.Add(renderer)
presenter.AttachVisuals(renderer.RootVisual, _
renderer.DrawingAttributes)
End Sub
Shared Sub New()
' Allow ink to be drawn only within the bounds of the control.
Dim owner As Type = GetType(InkSelector)
ClipToBoundsProperty.OverrideMetadata(owner, _
New FrameworkPropertyMetadata(True))
End Sub
' Prepare to collect stylus packets. If Mode is set to Select,
' get the IncrementalHitTester from the InkPresenter'newStroke
' StrokeCollection and subscribe to its StrokeHitChanged event.
Protected Overrides Sub OnStylusDown(ByVal e As StylusDownEventArgs)
MyBase.OnStylusDown(e)
Stylus.Capture(Me)
' Create a new StylusPointCollection using the StylusPointDescription
' from the stylus points in the StylusDownEventArgs.
stylusPoints = New StylusPointCollection()
Dim eventPoints As StylusPointCollection = e.GetStylusPoints(Me, stylusPoints.Description)
stylusPoints.Add(eventPoints)
InitializeHitTester(eventPoints)
End Sub
Protected Overrides Sub OnMouseLeftButtonDown(ByVal e As MouseButtonEventArgs)
MyBase.OnMouseLeftButtonDown(e)
Mouse.Capture(Me)
If Not (e.StylusDevice Is Nothing) Then
Return
End If
Dim pt As Point = e.GetPosition(Me)
Dim collectedPoints As New StylusPointCollection(New Point() {pt})
stylusPoints = New StylusPointCollection()
stylusPoints.Add(collectedPoints)
InitializeHitTester(collectedPoints)
End Sub
Private Sub InitializeHitTester(ByVal collectedPoints As StylusPointCollection)
' Deselect any selected strokes.
Dim selectedStroke As Stroke
For Each selectedStroke In selectedStrokes
selectedStroke.DrawingAttributes.Color = inkDA.Color
Next selectedStroke
selectedStrokes.Clear()
If modeState = InkMode.Select Then
' Remove the previously drawn lasso, if it exists.
If Not (lassoPath Is Nothing) Then
presenter.Strokes.Remove(lassoPath)
lassoPath = Nothing
End If
selectionTester = presenter.Strokes.GetIncrementalLassoHitTester(80)
AddHandler selectionTester.SelectionChanged, AddressOf selectionTester_SelectionChanged
selectionTester.AddPoints(collectedPoints)
End If
End Sub
' Collect the stylus packets as the stylus moves.
Protected Overrides Sub OnStylusMove(ByVal e As StylusEventArgs)
If stylusPoints Is Nothing Then
Return
End If
Dim collectedPoints As StylusPointCollection = e.GetStylusPoints(Me, stylusPoints.Description)
stylusPoints.Add(collectedPoints)
AddPointsToHitTester(collectedPoints)
End Sub
Protected Overrides Sub OnMouseMove(ByVal e As MouseEventArgs)
MyBase.OnMouseMove(e)
If Not (e.StylusDevice Is Nothing) Then
Return
End If
If e.LeftButton = MouseButtonState.Released Then
Return
End If
If stylusPoints Is Nothing Then
stylusPoints = New StylusPointCollection()
End If
Dim pt As Point = e.GetPosition(Me)
Dim collectedPoints As New StylusPointCollection(New Point() {pt})
stylusPoints.Add(collectedPoints)
AddPointsToHitTester(collectedPoints)
End Sub
Private Sub AddPointsToHitTester(ByVal collectedPoints As StylusPointCollection)
If modeState = InkMode.Select AndAlso _
Not selectionTester Is Nothing AndAlso _
selectionTester.IsValid Then
' When the control is selecting strokes, add the
' stylus packetList to selectionTester.
selectionTester.AddPoints(collectedPoints)
End If
End Sub
' When the user lifts the stylus, create a Stroke from the
' collected stylus points and add it to the InkPresenter.
' When the control is selecting strokes, add the
' point data to the IncrementalHitTester.
Protected Overrides Sub OnStylusUp(ByVal e As StylusEventArgs)
If stylusPoints Is Nothing Then
stylusPoints = New StylusPointCollection()
End If
Dim collectedPoints As StylusPointCollection = _
e.GetStylusPoints(Me, stylusPoints.Description)
stylusPoints.Add(collectedPoints)
AddPointsToHitTester(collectedPoints)
AddStrokeToPresenter()
stylusPoints = Nothing
Stylus.Capture(Nothing)
End Sub
Protected Overrides Sub OnMouseLeftButtonUp(ByVal e As MouseButtonEventArgs)
MyBase.OnMouseLeftButtonUp(e)
If Not (e.StylusDevice Is Nothing) Then
Return
End If
If stylusPoints Is Nothing Then
stylusPoints = New StylusPointCollection()
End If
Dim pt As Point = e.GetPosition(Me)
Dim collectedPoints As New StylusPointCollection(New Point() {pt})
stylusPoints.Add(collectedPoints)
AddPointsToHitTester(collectedPoints)
AddStrokeToPresenter()
stylusPoints = Nothing
Mouse.Capture(Nothing)
End Sub
Private Sub AddStrokeToPresenter()
Dim newStroke As New Stroke(stylusPoints)
If modeState = InkMode.Ink Then
' Add the stroke to the InkPresenter.
newStroke.DrawingAttributes = inkDA.Clone()
presenter.Strokes.Add(newStroke)
End If
If modeState = InkMode.Select AndAlso lassoPath Is Nothing Then
' Add the lasso to the InkPresenter and add the packetList
' to selectionTester.
lassoPath = newStroke
lassoPath.DrawingAttributes = selectDA.Clone()
presenter.Strokes.Add(lassoPath)
RemoveHandler selectionTester.SelectionChanged, _
AddressOf selectionTester_SelectionChanged
selectionTester.EndHitTesting()
End If
End Sub
Private Sub selectionTester_SelectionChanged(ByVal sender As Object, _
ByVal args As LassoSelectionChangedEventArgs)
' Change the color of all selected strokes to red.
Dim selectedStroke As Stroke
For Each selectedStroke In args.SelectedStrokes
selectedStroke.DrawingAttributes.Color = Colors.Red
selectedStrokes.Add(selectedStroke)
Next selectedStroke
' Change the color of all unselected strokes to
' their original color.
Dim unselectedStroke As Stroke
For Each unselectedStroke In args.DeselectedStrokes
unselectedStroke.DrawingAttributes.Color = inkDA.Color
selectedStrokes.Remove(unselectedStroke)
Next unselectedStroke
End Sub
' Property to indicate whether the user is inputting or
' selecting ink.
Public Property Mode() As InkMode
Get
Return Mode
End Get
Set(ByVal value As InkMode)
modeState = value
' Set the DrawingAttributes of the DynamicRenderer
If modeState = InkMode.Ink Then
renderer.DrawingAttributes = inkDA
Else
renderer.DrawingAttributes = selectDA
End If
' Reattach the visual of the DynamicRenderer to the InkPresenter.
presenter.DetachVisuals(renderer.RootVisual)
presenter.AttachVisuals(renderer.RootVisual, renderer.DrawingAttributes)
End Set
End Property
Private Sub DrawingAttributesChanged(ByVal sender As Object, _
ByVal e As PropertyDataChangedEventArgs)
' Reattach the visual of the DynamicRenderer to the InkPresenter
' whenever the DrawingAttributes change.
presenter.DetachVisuals(renderer.RootVisual)
presenter.AttachVisuals(renderer.RootVisual, _
renderer.DrawingAttributes)
End Sub
' Property to allow the user to change the pen's DrawingAttributes.
Public ReadOnly Property InkDrawingAttributes() As DrawingAttributes
Get
Return inkDA
End Get
End Property
' Property to allow the user to change the Selector'newStroke DrawingAttributes.
Public ReadOnly Property SelectDrawingAttributes() As DrawingAttributes
Get
Return selectDA
End Get
End Property
End Class
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