Comment : faire défiler le contenu d'un formulaire
Mise à jour : novembre 2007
Avec un contrôle Panel, vous pouvez affecter à sa propriété AutoScroll la valeur true et faire défiler verticalement son contenu. Toutefois, pour un défilement à la fois vertical et horizontal, vous devez ajouter des barres de défilement pour définir leurs propriétés.
Exemple
Cet exemple montre comment utiliser les contrôles des barres de défilement horizontale et verticale pour faire défiler une image de gauche à droite et de bas en haut sur un formulaire. Lorsque vous cliquez sur les barres de défilement, les propriétés Left et Left du panneau changent en fonction des valeurs des barres, créant ainsi le défilement.
Cet exemple crée une grande image dans le formulaire ou un rectangle avec un X qui relie les quatre angles en diagonale.
Le code de gestion des événements pour l'événement ValueChanged remplace les propriétés Left ou Left du Panel par la valeur modifiée de la barre de défilement. Ces propriétés diminuent lorsque vous faites défiler vers la droite avec la barre de défilement horizontale et vers le bas avec la barre de défilement verticale. Inversement, elles augmentent lorsque vous faites défiler dans les sens opposés.
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;
}
}
}
Compilation du code
Cet exemple nécessite des références aux espaces de noms suivants :
Voir aussi
Tâches
Comment : gérer les modifications d'orientation et de résolution