Postupy: Změna typu kurzoru
Tento příklad ukazuje, jak změnit Cursor ukazatel myši pro určitý prvek a pro aplikaci.
Tento příklad se skládá ze souboru XAML (Extensible Application Markup Language) a kódu za souborem.
Příklad
Vytvoří se uživatelské rozhraní, které se skládá z ComboBox výběru požadovaného Cursorobjektu , dvojice RadioButton objektů k určení, zda se změna kurzoru vztahuje pouze na jeden prvek nebo platí pro celou aplikaci, a Border to je prvek, na který je použit nový kurzor.
<StackPanel>
<Border Width="300">
<StackPanel Orientation="Horizontal"
HorizontalAlignment="Center">
<StackPanel Margin="10">
<Label HorizontalAlignment="Left">Cursor Type</Label>
<ComboBox Width="100"
SelectionChanged="CursorTypeChanged"
HorizontalAlignment="Left"
Name="CursorSelector">
<ComboBoxItem Content="AppStarting" />
<ComboBoxItem Content="ArrowCD" />
<ComboBoxItem Content="Arrow" />
<ComboBoxItem Content="Cross" />
<ComboBoxItem Content="HandCursor" />
<ComboBoxItem Content="Help" />
<ComboBoxItem Content="IBeam" />
<ComboBoxItem Content="No" />
<ComboBoxItem Content="None" />
<ComboBoxItem Content="Pen" />
<ComboBoxItem Content="ScrollSE" />
<ComboBoxItem Content="ScrollWE" />
<ComboBoxItem Content="SizeAll" />
<ComboBoxItem Content="SizeNESW" />
<ComboBoxItem Content="SizeNS" />
<ComboBoxItem Content="SizeNWSE" />
<ComboBoxItem Content="SizeWE" />
<ComboBoxItem Content="UpArrow" />
<ComboBoxItem Content="WaitCursor" />
<ComboBoxItem Content="Custom" />
</ComboBox>
</StackPanel>
<!-- The user can select different cursor types using this ComboBox -->
<StackPanel Margin="10">
<Label HorizontalAlignment="Left">Scope of Cursor</Label>
<StackPanel>
<RadioButton Name="rbScopeElement" IsChecked="True"
Checked="CursorScopeSelected">Display Area Only</RadioButton>
<RadioButton Name="rbScopeApplication"
Checked="CursorScopeSelected">Entire Appliation</RadioButton>
</StackPanel>
</StackPanel>
</StackPanel>
</Border>
<!-- When the mouse pointer is over this Border -->
<!-- the selected cursor type is shown -->
<Border Name="DisplayArea" Height="250" Width="400"
Margin="20" Background="AliceBlue">
<Label HorizontalAlignment="Center">
Move Mouse Pointer Over This Area
</Label>
</Border>
</StackPanel>
Následující kód za vytvoří obslužnou rutinu SelectionChanged události, která je volána při změně typu kurzoru v souboru ComboBox. Příkaz switch filtruje název kurzoru a nastaví Cursor vlastnost, která Border má název DisplayArea.
Pokud je změna kurzoru nastavena na "Celá aplikace", OverrideCursor vlastnost je nastavena na Cursor vlastnost Border ovládacího prvku. Tím se vynutí, aby se kurzor změnil pro celou aplikaci.
private void CursorTypeChanged(object sender, SelectionChangedEventArgs e)
{
ComboBox source = e.Source as ComboBox;
if (source != null)
{
ComboBoxItem selectedCursor = source.SelectedItem as ComboBoxItem;
// Changing the cursor of the Border control
// by setting the Cursor property
switch (selectedCursor.Content.ToString())
{
case "AppStarting":
DisplayArea.Cursor = Cursors.AppStarting;
break;
case "ArrowCD":
DisplayArea.Cursor = Cursors.ArrowCD;
break;
case "Arrow":
DisplayArea.Cursor = Cursors.Arrow;
break;
case "Cross":
DisplayArea.Cursor = Cursors.Cross;
break;
case "HandCursor":
DisplayArea.Cursor = Cursors.Hand;
break;
case "Help":
DisplayArea.Cursor = Cursors.Help;
break;
case "IBeam":
DisplayArea.Cursor = Cursors.IBeam;
break;
case "No":
DisplayArea.Cursor = Cursors.No;
break;
case "None":
DisplayArea.Cursor = Cursors.None;
break;
case "Pen":
DisplayArea.Cursor = Cursors.Pen;
break;
case "ScrollSE":
DisplayArea.Cursor = Cursors.ScrollSE;
break;
case "ScrollWE":
DisplayArea.Cursor = Cursors.ScrollWE;
break;
case "SizeAll":
DisplayArea.Cursor = Cursors.SizeAll;
break;
case "SizeNESW":
DisplayArea.Cursor = Cursors.SizeNESW;
break;
case "SizeNS":
DisplayArea.Cursor = Cursors.SizeNS;
break;
case "SizeNWSE":
DisplayArea.Cursor = Cursors.SizeNWSE;
break;
case "SizeWE":
DisplayArea.Cursor = Cursors.SizeWE;
break;
case "UpArrow":
DisplayArea.Cursor = Cursors.UpArrow;
break;
case "WaitCursor":
DisplayArea.Cursor = Cursors.Wait;
break;
case "Custom":
DisplayArea.Cursor = CustomCursor;
break;
default:
break;
}
// If the cursor scope is set to the entire application
// Use OverrideCursor to force the cursor for all elements
if (cursorScopeElementOnly == false)
{
Mouse.OverrideCursor = DisplayArea.Cursor;
}
}
}
' When the Radiobox changes, a new cursor type is set
Private Sub CursorTypeChanged(ByVal sender As Object, ByVal e As SelectionChangedEventArgs)
Dim item As String = CType(e.Source, ComboBox).SelectedItem.Content.ToString()
Select Case item
Case "AppStarting"
DisplayArea.Cursor = Cursors.AppStarting
Case "ArrowCD"
DisplayArea.Cursor = Cursors.ArrowCD
Case "Arrow"
DisplayArea.Cursor = Cursors.Arrow
Case "Cross"
DisplayArea.Cursor = Cursors.Cross
Case "HandCursor"
DisplayArea.Cursor = Cursors.Hand
Case "Help"
DisplayArea.Cursor = Cursors.Help
Case "IBeam"
DisplayArea.Cursor = Cursors.IBeam
Case "No"
DisplayArea.Cursor = Cursors.No
Case "None"
DisplayArea.Cursor = Cursors.None
Case "Pen"
DisplayArea.Cursor = Cursors.Pen
Case "ScrollSE"
DisplayArea.Cursor = Cursors.ScrollSE
Case "ScrollWE"
DisplayArea.Cursor = Cursors.ScrollWE
Case "SizeAll"
DisplayArea.Cursor = Cursors.SizeAll
Case "SizeNESW"
DisplayArea.Cursor = Cursors.SizeNESW
Case "SizeNS"
DisplayArea.Cursor = Cursors.SizeNS
Case "SizeNWSE"
DisplayArea.Cursor = Cursors.SizeNWSE
Case "SizeWE"
DisplayArea.Cursor = Cursors.SizeWE
Case "UpArrow"
DisplayArea.Cursor = Cursors.UpArrow
Case "WaitCursor"
DisplayArea.Cursor = Cursors.Wait
Case "Custom"
DisplayArea.Cursor = CustomCursor
End Select
' if the cursor scope is set to the entire application
' use OverrideCursor to force the cursor for all elements
If (cursorScopeElementOnly = False) Then
Mouse.OverrideCursor = DisplayArea.Cursor
End If
End Sub
Viz také
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