以窗口形式增加CheckedListBox中显示的每个项目的高度 [英] increase the height of each item displayed in CheckedListBox in window form

问题描述

大家好，





i有windows格式的checkedlistbox从数据库中获取数据

i want如果每个checkedlistbox项都增加行高。





任何想法。

解决方案

这个有效：

  int  height =  0 ，index =  0 ; 
  private   void  button1_Click（ object  sender，EventArgs e）
 {
 checkedListBox1.Items.Add（  new）; 
 height + = checkedListBox1.GetItemHeight（index）;  //  添加添加到checklistbox的项目高度 
  if （checkedListBox1.Height< height）
 {
 checkedListBox1.Size =  new 大小（checkedListBox1.Width，checkedListBox1.Height + checkedListBox1.GetItemHeight（ 0 ））; 
} 
 index ++; 
} 

这适用于VS2013网络FrameWork4.5



认证声明和不断上课



用法将其余代码放在Form_Load中，如示例代码所示。



< pre lang =vb> 私有 声明 功能 SendMessageByNum Lib user32 < span class =code-keyword>别名 SendMessageA _
（ ByVal hwnd 作为 IntPtr ， ByVal wMsg 作为 UInt32 ， ByVal wParam 作为 IntPtr ， ByVal lParam As IntPtr ）作为 IntPtr

私有 Const lB_SETITEMHEIGHT As 整数 =& H1A0

私有 Sub Form_Load（ ByVal sender As Object ， ByVal e As System.EventArgs） Handles 我 .Load

Dim ItemHeight 作为 整数 = 我 .Font.Height + 4
SendMessageByNum（CheckedListBoxControl.Handle，lB_SETITEMHEIGHT， CType （ 0 ， IntPtr ），< span class =code-keyword> CType （ItemHeight， IntPtr ））

结束 Sub

设置 DrawMode 到 OwnerDrawVariable 并为 DrawItem 和 OnMeasureItem 添加处理程序事件

 ListBox1.DrawMode = DrawMode.OwnerDrawVariable; 
 ListBox1.DrawItem + =  new  DrawItemEventHandler（ListBox1_DrawItem）; 

 受保护 覆盖  void  OnMeasureItem（MeasureItemEventArgs e）
 {
 e.ItemHeight = xxx; 
 此 .DropDownHeight = xxx *  5 ;  //  如果您使用边框 
} 
 
 
  private   void  ListBox1_DrawItem（ object  sender， 
 System.Windows.Forms.DrawItemEventArgs e）
 {
 e.DrawBackground（）; 
 
  //  设置项目的大小并绘制它 
  //    
 e.Graphics.DrawString（ListBox1.Items [e.Index]。 ToString（），
 e.Font，myBrush，e.Bounds，StringFormat.GenericDefault）; 
} 

您会找到很多样品。

hi all,


i have a checkedlistbox in windows form which gets data from database
i want to increse the row height if each item of checkedlistbox.


any idea.

解决方案

This one works:

int height =0, index =0;
        private void button1_Click(object sender, EventArgs e)
        {
            checkedListBox1.Items.Add("new");
            height += checkedListBox1.GetItemHeight(index); //Add height of item added to checklistbox
            if(checkedListBox1.Height< height)
            {
                checkedListBox1.Size = new Size(checkedListBox1.Width, checkedListBox1.Height + checkedListBox1.GetItemHeight(0));
            }
         index++;
        }

This works in VS2013 net FrameWork4.5

Put declare and constant at top of class

Usage put rest of code in Form_Load as in example code.

Private Declare Function SendMessageByNum Lib "user32" Alias "SendMessageA" _
  (ByVal hwnd As IntPtr, ByVal wMsg As UInt32, ByVal wParam As IntPtr, ByVal lParam As IntPtr) As IntPtr

Private Const lB_SETITEMHEIGHT As Integer = &H1A0

Private Sub Form_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

    Dim ItemHeight As Integer = Me.Font.Height + 4
    SendMessageByNum(CheckedListBoxControl.Handle, lB_SETITEMHEIGHT, CType(0, IntPtr), CType(ItemHeight, IntPtr))

End Sub

Set the DrawMode to OwnerDrawVariable and add a handler event for DrawItem and OnMeasureItem

ListBox1.DrawMode = DrawMode.OwnerDrawVariable;
ListBox1.DrawItem += new DrawItemEventHandler(ListBox1_DrawItem);

protected override void OnMeasureItem(MeasureItemEventArgs e)
{
    e.ItemHeight = xxx;
    this.DropDownHeight = xxx * 5; // if you use borders
}


private void ListBox1_DrawItem(object sender,
    System.Windows.Forms.DrawItemEventArgs e)
{
    e.DrawBackground();

    // set the size of the item and draw it
    //
    e.Graphics.DrawString(ListBox1.Items[e.Index].ToString(),
        e.Font, myBrush, e.Bounds, StringFormat.GenericDefault);
}

You'll find a lot of samples.

这篇关于以窗口形式增加CheckedListBox中显示的每个项目的高度的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！