c# winform重绘comboBox 给选择项添加一个删除按钮
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悬赏园豆：50
[已解决问题]
解决于 2015-10-29 09:31
c# winform重绘comboBox 给选择想添加一个删除按钮
private void comboBox1_DrawItem(object sender, DrawItemEventArgs e) { if ((e.State & DrawItemState.Selected) != 0)//鼠标选中在这个项上 { //渐变画刷 LinearGradientBrush brush = new LinearGradientBrush(e.Bounds, Color.FromArgb(255, 251, 237), Color.FromArgb(255, 236, 181), LinearGradientMode.Vertical); //填充区域 Rectangle borderRect = new Rectangle(0, e.Bounds.Y, e.Bounds.Width, e.Bounds.Height - 2); e.Graphics.FillRectangle(brush, borderRect); //画边框 Pen pen = new Pen(Color.FromArgb(229, 195, 101)); e.Graphics.DrawRectangle(pen, borderRect); } else { SolidBrush brush = new SolidBrush(Color.FromArgb(217, 223, 230)); e.Graphics.FillRectangle(brush, e.Bounds); } //获得项图片,绘制图片 MyItem item = (MyItem)comboBox1.Items[e.Index]; Image img = item.Img; //图片绘制的区域 if (img != null) { Rectangle imgRect = new Rectangle(e.Bounds.Width - 30, e.Bounds.Y, 24, 24); e.Graphics.DrawImage(img, imgRect); Rectangle textRect = new Rectangle(10, imgRect.Y, e.Bounds.Width - imgRect.Width, e.Bounds.Height + 2); string itemText = comboBox1.Items[e.Index].ToString(); StringFormat strFormat = new StringFormat(); strFormat.LineAlignment = StringAlignment.Center; e.Graphics.DrawString(itemText, new Font("宋体", 12), Brushes.Black, textRect, strFormat); } }
怎样才能给这个image添加一个点击事件
最佳答案
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直接用Item的点击事件就可以了，但是点击时判断鼠标有没有落在图片上面，懂吗？
收获园豆：50
要怎么判断呢，请大神指点
@SnowLove:
鼠标位置你能知道不？Item的Rect你能知道不？
@XiaoFaye: 要用哪个事件，combobox_mouseclick吗
@SnowLove:
public class Form1 : Form { [DllImport("user32")] private static extern int GetComboBoxInfo(IntPtr hwnd, out COMBOBOXINFO comboInfo); struct RECT { public int left, top, right, bottom; } struct COMBOBOXINFO { public int cbSize; public RECT rcItem; public RECT rcButton; public int stateButton; public IntPtr hwndCombo; public IntPtr hwndItem; public IntPtr hwndList; } public Form1(){ InitializeComponent(); comboBox1.HandleCreated += (s, e) => { COMBOBOXINFO combo = new COMBOBOXINFO(); combo.cbSize = Marshal.SizeOf(combo); GetComboBoxInfo(comboBox1.Handle, out combo); hwnd = combo.hwndList; init = false; }; } bool init; IntPtr hwnd; NativeCombo nativeCombo = new NativeCombo(); //This is to store the Rectangle info of your Icons //Key: the Item index //Value: the Rectangle of the Icon of the item (not the Rectangle of the item) Dictionary<int, Rectangle> dict = new Dictionary<int, Rectangle>(); public class NativeCombo : NativeWindow { //this is custom MouseDown event to hook into later public event MouseEventHandler MouseDown; protected override void WndProc(ref Message m) { if (m.Msg == 0x201)//WM_LBUTTONDOWN = 0x201 { int x = m.LParam.ToInt32() & 0x00ff; int y = m.LParam.ToInt32() >> 16; if (MouseDown != null) MouseDown(null, new MouseEventArgs(MouseButtons.Left, 1, x, y, 0)); } base.WndProc(ref m); } } //DropDown event handler of your comboBox1 private void comboBox1_DropDown(object sender, EventArgs e) { if (!init) { //Register the MouseDown event handler <--- THIS is WHAT you want. nativeCombo.MouseDown += comboListMouseDown; nativeCombo.AssignHandle(hwnd); init = true; } } //This is the MouseDown event handler to handle the clicked icon private void comboListMouseDown(object sender, MouseEventArgs e){ foreach (var kv in dict) { if (kv.Value.Contains(e.Location)) { //Show the item index whose the corresponding icon was held down MessageBox.Show(kv.Key.ToString()); return; } } } //DrawItem event handler private void comboBox1_DrawItem(object sender, DrawItemEventArgs e) { //We have to save the Rectangle info of the item icons Rectangle rect = new Rectangle(0, e.Bounds.Top, e.Bounds.Height, e.Bounds.Height); dict[e.Index] = rect; //Draw the icon //e.Graphics.DrawImage(yourImage, rect); } }
@XiaoFaye:感谢
@XiaoFaye: 我按照这种方式画出来以后 combobox 没有滚动条了，郁闷
@SnowLove:
应该是被覆盖住了，你调整下大小位置看看。
