ListBox.HorizontalScrollbar 屬性

定義

命名空間:

System.Windows.Forms

組件:

System.Windows.Forms.dll

取得或設定值，指出選取水平捲軸是否顯示於控制項中。

public:
 property bool HorizontalScrollbar { bool get(); void set(bool value); };

public bool HorizontalScrollbar { get; set; }

member this.HorizontalScrollbar : bool with get, set

Public Property HorizontalScrollbar As Boolean

屬性值

Boolean

如果水平捲軸顯示於控制項中，則為 true，否則為 false。 預設為 false。

範例

下列程式碼範例示範如何使用 HorizontalScrollbar 和 HorizontalExtent 屬性來顯示水準捲軸，以顯示控制項中的所有 ListBox 專案文字。 此範例也會使用 IntegralHeight 屬性來確保專案不會部分顯示，因為控制項的大小 ListBox 。 此範例要求 ListBox 已將名為 的 listBox1 控制項新增至表單。

private:
   void DisplayHScroll()
   {
      // Make sure no items are displayed partially.
      listBox1->IntegralHeight = true;

      // Add items that are wide to the ListBox.
      for ( int x = 0; x < 10; x++ )
      {
         listBox1->Items->Add( String::Format( "Item {0} is a very large value that requires scroll bars", x ) );

      }

      // Display a horizontal scroll bar.
      listBox1->HorizontalScrollbar = true;

      // Create a Graphics object to use when determining the size of the largest item in the ListBox.
      Graphics^ g = listBox1->CreateGraphics();

      // Determine the size for HorizontalExtent using the MeasureString method using the last item in the list.
      int hzSize = (int)g->MeasureString( dynamic_cast<String^>(listBox1->Items[ listBox1->Items->Count - 1 ]), listBox1->Font ).Width;

      // Set the HorizontalExtent property.
      listBox1->HorizontalExtent = hzSize;
   }

private void DisplayHScroll()
{
   // Make sure no items are displayed partially.
   listBox1.IntegralHeight = true;

   // Add items that are wide to the ListBox.
   for (int x = 0; x < 10; x++)
   {
      listBox1.Items.Add("Item  " + x.ToString() + " is a very large value that requires scroll bars");
   }

   // Display a horizontal scroll bar.
   listBox1.HorizontalScrollbar = true;

   // Create a Graphics object to use when determining the size of the largest item in the ListBox.
   Graphics g = listBox1.CreateGraphics();

   // Determine the size for HorizontalExtent using the MeasureString method using the last item in the list.
   int hzSize = (int) g.MeasureString(listBox1.Items[listBox1.Items.Count -1].ToString(),listBox1.Font).Width;
   // Set the HorizontalExtent property.
   listBox1.HorizontalExtent = hzSize;
}

Private Sub DisplayHScroll()
     ' Make sure no items are displayed partially.
   listBox1.IntegralHeight = True
   Dim x As Integer

   ' Add items that are wide to the ListBox.
   For x = 0 To 10
      listBox1.Items.Add("Item  " + x.ToString() + " is a very large value that requires scroll bars")
   Next x

   ' Display a horizontal scroll bar.
   listBox1.HorizontalScrollbar = True

   ' Create a Graphics object to use when determining the size of the largest item in the ListBox.
   Dim g As System.Drawing.Graphics = listBox1.CreateGraphics()


   ' Determine the size for HorizontalExtent using the MeasureString method using the last item in the list.
   Dim hzSize As Integer = g.MeasureString(listBox1.Items(listBox1.Items.Count - 1).ToString(), listBox1.Font).Width
   ' Set the HorizontalExtent property.
   listBox1.HorizontalExtent = hzSize
End Sub

備註

屬性 HorizontalScrollbar 會決定 在超出控制項右邊緣的專案 ListBox 寬度時，是否 ListBox 應該顯示水準捲軸。 當此屬性設定為 true 時，系統會根據 中的 ListBox 專案寬度自動顯示捲軸。 ListBox如果 是擁有者繪製 ListBox 的 ，若要正確顯示水準捲軸，您必須設定 HorizontalExtent 屬性。

另請參閱

• HorizontalExtent