LayoutEngine Klasa
Definicja
Ważne
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Udostępnia klasę bazową do implementowania aparatów układu.
public ref class LayoutEngine abstract
public abstract class LayoutEngine
type LayoutEngine = class
Public MustInherit Class LayoutEngine
- Dziedziczenie
-
LayoutEngine
Przykłady
W poniższym przykładzie kodu pokazano użycie klasy do implementowania zachowania układu niestandardowego LayoutEngine .
#using <System.Drawing.dll>
#using <System.dll>
#using <System.Windows.Forms.dll>
using namespace System;
using namespace System::Collections::Generic;
using namespace System::Drawing;
using namespace System::Text;
using namespace System::Windows::Forms;
using namespace System::Windows::Forms::Layout;
// This class demonstrates a simple custom layout engine.
public ref class DemoFlowLayout : public LayoutEngine
{
public:
virtual bool Layout(Object^ container,
LayoutEventArgs^ layoutEventArgs) override
{
Control^ parent = nullptr;
try
{
parent = (Control ^) container;
}
catch (InvalidCastException^ ex)
{
throw gcnew ArgumentException(
"The parameter 'container' must be a control", "container", ex);
}
// Use DisplayRectangle so that parent.Padding is honored.
Rectangle parentDisplayRectangle = parent->DisplayRectangle;
Point nextControlLocation = parentDisplayRectangle.Location;
for each (Control^ currentControl in parent->Controls)
{
// Only apply layout to visible controls.
if (!currentControl->Visible)
{
continue;
}
// Respect the margin of the control:
// shift over the left and the top.
nextControlLocation.Offset(currentControl->Margin.Left,
currentControl->Margin.Top);
// Set the location of the control.
currentControl->Location = nextControlLocation;
// Set the autosized controls to their
// autosized heights.
if (currentControl->AutoSize)
{
currentControl->Size = currentControl->GetPreferredSize(
parentDisplayRectangle.Size);
}
// Move X back to the display rectangle origin.
nextControlLocation.X = parentDisplayRectangle.X;
// Increment Y by the height of the control
// and the bottom margin.
nextControlLocation.Y += currentControl->Height +
currentControl->Margin.Bottom;
}
// Optional: Return whether or not the container's
// parent should perform layout as a result of this
// layout. Some layout engines return the value of
// the container's AutoSize property.
return false;
}
};
// This class demonstrates a simple custom layout panel.
// It overrides the LayoutEngine property of the Panel
// control to provide a custom layout engine.
public ref class DemoFlowPanel : public Panel
{
private:
DemoFlowLayout^ layoutEngine;
public:
DemoFlowPanel()
{
layoutEngine = gcnew DemoFlowLayout();
}
public:
virtual property System::Windows::Forms::Layout::LayoutEngine^ LayoutEngine
{
System::Windows::Forms::Layout::LayoutEngine^ get() override
{
if (layoutEngine == nullptr)
{
layoutEngine = gcnew DemoFlowLayout();
}
return layoutEngine;
}
}
};
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Windows.Forms.Layout;
// This class demonstrates a simple custom layout panel.
// It overrides the LayoutEngine property of the Panel
// control to provide a custom layout engine.
public class DemoFlowPanel : Panel
{
private DemoFlowLayout layoutEngine;
public DemoFlowPanel()
{
}
public override LayoutEngine LayoutEngine
{
get
{
layoutEngine ??= new DemoFlowLayout();
return layoutEngine;
}
}
}
// This class demonstrates a simple custom layout engine.
public class DemoFlowLayout : LayoutEngine
{
public override bool Layout(
object container,
LayoutEventArgs layoutEventArgs)
{
Control parent = container as Control;
// Use DisplayRectangle so that parent.Padding is honored.
Rectangle parentDisplayRectangle = parent.DisplayRectangle;
Point nextControlLocation = parentDisplayRectangle.Location;
foreach (Control c in parent.Controls)
{
// Only apply layout to visible controls.
if (!c.Visible)
{
continue;
}
// Respect the margin of the control:
// shift over the left and the top.
nextControlLocation.Offset(c.Margin.Left, c.Margin.Top);
// Set the location of the control.
c.Location = nextControlLocation;
// Set the autosized controls to their
// autosized heights.
if (c.AutoSize)
{
c.Size = c.GetPreferredSize(parentDisplayRectangle.Size);
}
// Move X back to the display rectangle origin.
nextControlLocation.X = parentDisplayRectangle.X;
// Increment Y by the height of the control
// and the bottom margin.
nextControlLocation.Y += c.Height + c.Margin.Bottom;
}
// Optional: Return whether or not the container's
// parent should perform layout as a result of this
// layout. Some layout engines return the value of
// the container's AutoSize property.
return false;
}
}
Imports System.Collections.Generic
Imports System.Drawing
Imports System.Text
Imports System.Windows.Forms
Imports System.Windows.Forms.Layout
' This class demonstrates a simple custom layout panel.
' It overrides the LayoutEngine property of the Panel
' control to provide a custom layout engine.
Public Class DemoFlowPanel
Inherits Panel
Private layoutEng As DemoFlowLayout
Public Sub New()
End Sub
Public Overrides ReadOnly Property LayoutEngine() As LayoutEngine
Get
If layoutEng Is Nothing Then
layoutEng = New DemoFlowLayout()
End If
Return layoutEng
End Get
End Property
End Class
' This class demonstrates a simple custom layout engine.
Public Class DemoFlowLayout
Inherits LayoutEngine
Public Overrides Function Layout( _
ByVal container As Object, _
ByVal layoutEventArgs As LayoutEventArgs) As Boolean
Dim parent As Control = container
' Use DisplayRectangle so that parent.Padding is honored.
Dim parentDisplayRectangle As Rectangle = parent.DisplayRectangle
Dim nextControlLocation As Point = parentDisplayRectangle.Location
Dim c As Control
For Each c In parent.Controls
' Only apply layout to visible controls.
If c.Visible <> True Then
Continue For
End If
' Respect the margin of the control:
' shift over the left and the top.
nextControlLocation.Offset(c.Margin.Left, c.Margin.Top)
' Set the location of the control.
c.Location = nextControlLocation
' Set the autosized controls to their
' autosized heights.
If c.AutoSize Then
c.Size = c.GetPreferredSize(parentDisplayRectangle.Size)
End If
' Move X back to the display rectangle origin.
nextControlLocation.X = parentDisplayRectangle.X
' Increment Y by the height of the control
' and the bottom margin.
nextControlLocation.Y += c.Height + c.Margin.Bottom
Next c
' Optional: Return whether or not the container's
' parent should perform layout as a result of this
' layout. Some layout engines return the value of
' the container's AutoSize property.
Return False
End Function
End Class
Uwagi
LayoutEngine Użyj klasy , jeśli chcesz utworzyć niestandardowe zachowanie układu w czasie wykonywania. Utwórz własną klasę z LayoutEngine klasy i przesłoń metodę Layout w celu zdefiniowania zachowania układu niestandardowego.
Konstruktory
LayoutEngine() |
Inicjuje nowe wystąpienie klasy LayoutEngine. |
Metody
Equals(Object) |
Określa, czy dany obiekt jest taki sam, jak bieżący obiekt. (Odziedziczone po Object) |
GetHashCode() |
Służy jako domyślna funkcja skrótu. (Odziedziczone po Object) |
GetType() |
Type Pobiera wartość bieżącego wystąpienia. (Odziedziczone po Object) |
InitLayout(Object, BoundsSpecified) |
Inicjuje aparat układu. |
Layout(Object, LayoutEventArgs) |
Żąda, aby aparat układu wykonał operację układu. |
MemberwiseClone() |
Tworzy płytkią kopię bieżącego Objectelementu . (Odziedziczone po Object) |
ToString() |
Zwraca ciąg reprezentujący bieżący obiekt. (Odziedziczone po Object) |