ScrollBar.Maximum 屬性

定義

命名空間:

System.Windows.Forms

組件:

System.Windows.Forms.dll

取得或設定可捲動範圍的上限值。

public:
 property int Maximum { int get(); void set(int value); };

public int Maximum { get; set; }

member this.Maximum : int with get, set

Public Property Maximum As Integer

屬性值

Int32

數值。 預設值是 100。

範例

下列範例假設您已建立 Form 、將 新增 PictureBox 至 Form ，並將水準 HScrollBar 和垂直 VScrollBar 新增至 PictureBox 。 此程式碼範例是類別概觀所提供較大範例的 ScrollBar 一部分。

在此範例中 Maximum ，如果顯示該屬性加上屬性大小的調整因數，則會將 屬性的大小設定 Image 為 加上捲軸的大小 LargeChange 。

您必須新增 和 System.Windows.Forms 命名空間的 System.Drawing 參考，才能執行此範例。

注意

如需如何在 Visual Studio 中執行此範例的指示，請參閱How to： Compile and Run a Complete Windows Forms Code Example Using Visual Studio。

public void SetScrollBarValues()
{
    //Set the following scrollbar properties:

    //Minimum: Set to 0

    //SmallChange and LargeChange: Per UI guidelines, these must be set
    //    relative to the size of the view that the user sees, not to
    //    the total size including the unseen part.  In this example,
    //    these must be set relative to the picture box, not to the image.

    //Maximum: Calculate in steps:
    //Step 1: The maximum to scroll is the size of the unseen part.
    //Step 2: Add the size of visible scrollbars if necessary.
    //Step 3: Add an adjustment factor of ScrollBar.LargeChange.

    //Configure the horizontal scrollbar
    //---------------------------------------------
    if (this.hScrollBar1.Visible)
    {
        this.hScrollBar1.Minimum = 0;
        this.hScrollBar1.SmallChange = this.pictureBox1.Width / 20;
        this.hScrollBar1.LargeChange = this.pictureBox1.Width / 10;

        this.hScrollBar1.Maximum = this.pictureBox1.Image.Size.Width - pictureBox1.ClientSize.Width;  //step 1

        if (this.vScrollBar1.Visible) //step 2
        {
            this.hScrollBar1.Maximum += this.vScrollBar1.Width;
        }

        this.hScrollBar1.Maximum += this.hScrollBar1.LargeChange; //step 3
    }

    //Configure the vertical scrollbar
    //---------------------------------------------
    if (this.vScrollBar1.Visible)
    {
        this.vScrollBar1.Minimum = 0;
        this.vScrollBar1.SmallChange = this.pictureBox1.Height / 20;
        this.vScrollBar1.LargeChange = this.pictureBox1.Height / 10;

        this.vScrollBar1.Maximum = this.pictureBox1.Image.Size.Height - pictureBox1.ClientSize.Height; //step 1

        if (this.hScrollBar1.Visible) //step 2
        {
            this.vScrollBar1.Maximum += this.hScrollBar1.Height;
        }

        this.vScrollBar1.Maximum += this.vScrollBar1.LargeChange; //step 3
    }
}

Public Sub SetScrollBarValues()

    'Set the following scrollbar properties:

    'Minimum: Set to 0

    'SmallChange and LargeChange: Per UI guidelines, these must be set
    '    relative to the size of the view that the user sees, not to
    '    the total size including the unseen part.  In this example,
    '    these must be set relative to the picture box, not to the image.

    'Maximum: Calculate in steps:
    'Step 1: The maximum to scroll is the size of the unseen part.
    'Step 2: Add the size of visible scrollbars if necessary.
    'Step 3: Add an adjustment factor of ScrollBar.LargeChange.


    'Configure the horizontal scrollbar
    '---------------------------------------------
    If (Me.hScrollBar1.Visible) Then

        Me.hScrollBar1.Minimum = 0
        Me.hScrollBar1.SmallChange = CInt(Me.pictureBox1.Width / 20)
        Me.hScrollBar1.LargeChange = CInt(Me.pictureBox1.Width / 10)

        Me.hScrollBar1.Maximum = Me.pictureBox1.Image.Size.Width - pictureBox1.ClientSize.Width  'step 1

        If (Me.vScrollBar1.Visible) Then 'step 2

            Me.hScrollBar1.Maximum += Me.vScrollBar1.Width
        End If

        Me.hScrollBar1.Maximum += Me.hScrollBar1.LargeChange 'step 3
    End If

    'Configure the vertical scrollbar
    '---------------------------------------------
    If (Me.vScrollBar1.Visible) Then

        Me.vScrollBar1.Minimum = 0
        Me.vScrollBar1.SmallChange = CInt(Me.pictureBox1.Height / 20)
        Me.vScrollBar1.LargeChange = CInt(Me.pictureBox1.Height / 10)

        Me.vScrollBar1.Maximum = Me.pictureBox1.Image.Size.Height - pictureBox1.ClientSize.Height 'step 1

        If (Me.hScrollBar1.Visible) Then 'step 2

            Me.vScrollBar1.Maximum += Me.hScrollBar1.Height
        End If

        Me.vScrollBar1.Maximum += Me.vScrollBar1.LargeChange 'step 3
    End If
 End Sub

備註

您可以考慮動態調整 Maximum 屬性，以符合捲軸的父系大小，與圖元大小或顯示的資料列或行數成比例。

最大值只能以程式設計方式達到。 捲軸的值無法在執行時間透過使用者互動達到其最大值。 可透過使用者互動達到的最大值等於 1 加上 Maximum 屬性值減去 LargeChange 屬性值。 如有必要，您可以將 屬性設定 Maximum 為物件 -1 的大小，以考慮 1 的期間。

另請參閱

• Minimum