Gewusst wie: Durchführen eines Bildlaufs für Formularinhalte
Aktualisiert: November 2007
Bei einem Panel-Steuerelement können Sie die AutoScroll-Eigenschaft auf true festlegen und einen vertikalen Bildlauf durch den Inhalt durchführen. Um jedoch sowohl einen vertikalen als auch einen horizontalen Bildlauf durchführen zu können, müssen Sie Bildlaufleisten hinzufügen, um deren Eigenschaften zu definieren.
Beispiel
In diesem Beispiel wird veranschaulicht, wie mithilfe horizontaler und vertikaler Bildlaufleisten auf einem Formular ein Bildlauf in beiden Richtungen durchgeführt werden kann. Wenn Sie auf die Bildlaufleisten klicken, ändern sich die Left-Eigenschaft und die Left-Eigenschaft des Fensters entsprechend den Bildlaufleistenwerten, wodurch der Bildlaufeffekt erzielt wird.
In diesem Beispiel wird im Formular ein großes Bild bzw. ein Rechteck erstellt, dessen vier Ecken diagonal mit einem X verbunden sind.
Der Ereignisbehandlungscode für das ValueChanged-Ereignis ändert die Left-Eigenschaft oder die Left-Eigenschaft von Panel in den geänderten Wert der Bildlaufleiste. Der Wert dieser Eigenschaften verringert sich, wenn Sie mit der horizontalen Bildlaufleiste einen Bildlauf nach links und mit der vertikalen Bildlaufleiste einen Bildlauf nach unten durchführen. Umgekehrt nimmt der Wert zu, wenn Sie einen Bildlauf in die entgegengesetzten Richtungen durchführen.
Imports System
Imports System.Drawing
Imports System.Windows.Forms
Public Class Scrolling
Inherits System.Windows.Forms.Form
Private WithEvents HScrollBar1 As System.Windows.Forms.HScrollBar
Private WithEvents VScrollBar1 As System.Windows.Forms.VScrollBar
Private Panel1 As System.Windows.Forms.Panel
Private Label1 As System.Windows.Forms.Label
Private Label2 As System.Windows.Forms.Label
Private Label3 As System.Windows.Forms.Label
Private Label4 As System.Windows.Forms.Label
Private PictureBox1 As System.Windows.Forms.PictureBox
Private MainMenu1 As System.Windows.Forms.MainMenu
Public Sub New()
InitializeComponent()
Dim bmp As New Bitmap(PictureBox1.Width, PictureBox1.Height)
Dim blackpen As New Pen(Color.Black)
Dim g As Graphics = Graphics.FromImage(bmp)
g.FillRectangle(New SolidBrush(Color.Gainsboro), 0, 0, bmp.Width, bmp.Height)
g.DrawLine(blackpen, 0, 0, bmp.Width, bmp.Height)
g.DrawLine(blackpen, 0, bmp.Height, bmp.Width, 0)
g.Dispose()
Me.PictureBox1.Image = bmp
Me.PictureBox1.Size = bmp.Size
Me.VScrollBar1.Maximum = bmp.Height + Me.ClientSize.Height
Me.HScrollBar1.Maximum = bmp.Width + Me.ClientSize.Width
Me.HScrollBar1.Value = 0
Me.Text = "x = 0, y = 0"
End Sub
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
MyBase.Dispose(disposing)
End Sub
Private Sub InitializeComponent()
Me.MainMenu1 = New System.Windows.Forms.MainMenu
Me.HScrollBar1 = New System.Windows.Forms.HScrollBar
Me.VScrollBar1 = New System.Windows.Forms.VScrollBar
Me.Panel1 = New System.Windows.Forms.Panel
Me.PictureBox1 = New System.Windows.Forms.PictureBox
Me.Label1 = New System.Windows.Forms.Label
Me.Label2 = New System.Windows.Forms.Label
Me.Label3 = New System.Windows.Forms.Label
Me.Label4 = New System.Windows.Forms.Label
'
' HScrollBar1
'
Me.HScrollBar1.LargeChange = 240
Me.HScrollBar1.Location = New System.Drawing.Point(0, 255)
Me.HScrollBar1.Maximum = 493
Me.HScrollBar1.Size = New System.Drawing.Size(227, 13)
'
' VScrollBar1
'
Me.VScrollBar1.LargeChange = 268
Me.VScrollBar1.Location = New System.Drawing.Point(227, 0)
Me.VScrollBar1.Maximum = 549
Me.VScrollBar1.Size = New System.Drawing.Size(13, 255)
'
' Panel1
'
Me.Panel1.Controls.Add(Me.PictureBox1)
Me.Panel1.Controls.Add(Me.Label1)
Me.Panel1.Controls.Add(Me.Label2)
Me.Panel1.Controls.Add(Me.Label3)
Me.Panel1.Controls.Add(Me.Label4)
Me.Panel1.Size = New System.Drawing.Size(480, 536)
'
' PictureBox1
'
Me.PictureBox1.Location = New System.Drawing.Point(88, 36)
Me.PictureBox1.Size = New System.Drawing.Size(304, 464)
'
' Label1
'
Me.Label1.Location = New System.Drawing.Point(8, 8)
Me.Label1.Size = New System.Drawing.Size(82, 20)
Me.Label1.Text = "Top Left"
'
' Label2
'
Me.Label2.Location = New System.Drawing.Point(400, 8)
Me.Label2.Size = New System.Drawing.Size(82, 20)
Me.Label2.Text = "Top Right"
'
' Label3
'
Me.Label3.Location = New System.Drawing.Point(8, 508)
Me.Label3.Size = New System.Drawing.Size(82, 20)
Me.Label3.Text = "Bottom Left"
'
' Label4
'
Me.Label4.Location = New System.Drawing.Point(400, 508)
Me.Label4.Size = New System.Drawing.Size(82, 20)
Me.Label4.Text = "Bottom Right"
'
' Scrolling
'
Me.Controls.Add(VScrollBar1)
Me.Controls.Add(HScrollBar1)
Me.Controls.Add(Panel1)
Me.Menu = Me.MainMenu1
Me.Text = "Scrolling"
End Sub
Shared Sub Main()
Application.Run(New Scrolling)
End Sub
Private Sub HScrollBar1_ValueChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles HScrollBar1.ValueChanged
Me.Panel1.Left = -Me.HScrollBar1.Value
' Display the current values in the title bar.
Me.Text = "x = " + Me.Panel1.Location.X.ToString + ", y = " + Me.Panel1.Location.Y.ToString
End Sub
Private Sub VScrollBar1_ValueChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles VScrollBar1.ValueChanged
Me.Panel1.Top = -Me.VScrollBar1.Value
' Display the current values in the title bar.
Me.Text = "x = " + Me.Panel1.Location.X.ToString + ", y = " + Me.Panel1.Location.Y.ToString
End Sub
End Class
using System;
using System.Drawing;
using System.Collections;
using System.Windows.Forms;
using System.Data;
using System.Reflection;
namespace Scrolling
{
public class Scrolling : System.Windows.Forms.Form
{
private System.Windows.Forms.HScrollBar hScrollBar1;
private System.Windows.Forms.VScrollBar vScrollBar1;
private System.Windows.Forms.Panel panel1;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.Label label3;
private System.Windows.Forms.Label label4;
private System.Windows.Forms.PictureBox pictureBox1;
private System.Windows.Forms.MainMenu mainMenu1;
public Scrolling()
{
InitializeComponent();
Bitmap bmp = new Bitmap(pictureBox1.Width,pictureBox1.Height);
Pen blackpen = new Pen(Color.Black);
Graphics g = Graphics.FromImage(bmp);
g.FillRectangle(new SolidBrush(Color.Gainsboro),0,0,bmp.Width,bmp.Height);
g.DrawLine(blackpen,0,0, bmp.Width, bmp.Height);
g.DrawLine(blackpen,0,bmp.Height,bmp.Width,0);
g.Dispose();
this.pictureBox1.Image = bmp;
this.pictureBox1.Size = bmp.Size;
this.vScrollBar1.Maximum = bmp.Height + this.ClientSize.Height;
this.hScrollBar1.Maximum = bmp.Width + this.ClientSize.Width;
this.hScrollBar1.Value = 0;
this.Text = "x = 0, y = 0";
}
protected override void Dispose( bool disposing )
{
base.Dispose( disposing );
}
private void InitializeComponent()
{
this.mainMenu1 = new System.Windows.Forms.MainMenu();
this.hScrollBar1 = new System.Windows.Forms.HScrollBar();
this.vScrollBar1 = new System.Windows.Forms.VScrollBar();
this.panel1 = new System.Windows.Forms.Panel();
this.pictureBox1 = new System.Windows.Forms.PictureBox();
this.label1 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.label3 = new System.Windows.Forms.Label();
this.label4 = new System.Windows.Forms.Label();
//
// hScrollBar1
//
this.hScrollBar1.LargeChange = 240;
this.hScrollBar1.Location = new System.Drawing.Point(0, 255);
this.hScrollBar1.Maximum = 493;
this.hScrollBar1.Size = new System.Drawing.Size(227, 13);
this.hScrollBar1.ValueChanged += new System.EventHandler(this.hScrollBar1_ValueChanged);
//
// vScrollBar1
//
this.vScrollBar1.LargeChange = 268;
this.vScrollBar1.Location = new System.Drawing.Point(227, 0);
this.vScrollBar1.Maximum = 549;
this.vScrollBar1.Size = new System.Drawing.Size(13, 255);
this.vScrollBar1.ValueChanged += new System.EventHandler(this.vScrollBar1_ValueChanged);
//
// panel1
//
this.panel1.Controls.Add(this.pictureBox1);
this.panel1.Controls.Add(this.label1);
this.panel1.Controls.Add(this.label2);
this.panel1.Controls.Add(this.label3);
this.panel1.Controls.Add(this.label4);
this.panel1.Size = new System.Drawing.Size(480, 536);
//
// pictureBox1
//
this.pictureBox1.Location = new System.Drawing.Point(88, 36);
this.pictureBox1.Size = new System.Drawing.Size(304, 464);
//
// label1
//
this.label1.Location = new System.Drawing.Point(8, 8);
this.label1.Size = new System.Drawing.Size(82, 20);
this.label1.Text = "Top Left";
//
// label2
//
this.label2.Location = new System.Drawing.Point(400, 8);
this.label2.Size = new System.Drawing.Size(82, 20);
this.label2.Text = "Top Right";
//
// label3
//
this.label3.Location = new System.Drawing.Point(8, 508);
this.label3.Size = new System.Drawing.Size(82, 20);
this.label3.Text = "Bottom Left";
//
// label4
//
this.label4.Location = new System.Drawing.Point(400, 508);
this.label4.Size = new System.Drawing.Size(82, 20);
this.label4.Text = "Bottom Right";
//
// Scrolling
//
this.Controls.Add(this.vScrollBar1);
this.Controls.Add(this.hScrollBar1);
this.Controls.Add(this.panel1);
this.Menu = this.mainMenu1;
this.Text = "Scrolling";
}
static void Main()
{
Application.Run(new Scrolling());
}
private void hScrollBar1_ValueChanged(object sender, System.EventArgs e)
{
this.panel1.Left = -this.hScrollBar1.Value;
// Display the current values in the title bar.
this.Text = "x = " + this.panel1.Location.X + ", y = " + this.panel1.Location.Y;
}
private void vScrollBar1_ValueChanged(object sender, System.EventArgs e)
{
this.panel1.Top = -this.vScrollBar1.Value;
// Display the current values in the title bar.
this.Text = "x = " + this.panel1.Location.X + ", y = " + this.panel1.Location.Y;
}
}
}
Kompilieren des Codes
Für dieses Beispiel sind Verweise auf die folgenden Namespaces erforderlich:
Siehe auch
Aufgaben
Gewusst wie: Behandeln von Änderungen der Ausrichtung und Auflösung