ListBox.HorizontalScrollbar 属性

定义

命名空间:

System.Windows.Forms

程序集:

System.Windows.Forms.dll

获取或设置一个值，该值指示是否在控件中显示水平滚动条。

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

属性值

Boolean

如果为 true，则在控件中显示水平滚动条；否则为 false。 默认值为 false。

示例

下面的代码示例演示如何使用 HorizontalScrollbar 和 HorizontalExtent 属性显示显示控件中 ListBox 所有项文本的水平滚动条。 该示例还使用 IntegralHeight 该属性来确保由于控件的大小 ListBox 而未部分显示项。 此示例要求 ListBox 已将名为的 listBox1控件添加到窗体中。

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

注解

该HorizontalScrollbar属性确定当在超出控件右边缘的项ListBox宽度时，ListBox是否应显示水平滚动条。 当此属性设置为 true时，滚动条将根据项的 ListBox宽度自动显示。 ListBox如果为所有者绘制ListBox，若要正确显示水平滚动条，则必须设置HorizontalExtent该属性。

另请参阅

• HorizontalExtent