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這是這個問題 C# override OnDrawItem 的擴展,我做了這個自定義組合框類添加實,虛線筆集合到組合框
class LineStyleComboBox: System.Windows.Forms.ComboBox
{
Pen SolidPen;
Pen DashedPen;
public LineStyleComboBox()
{
this.DropDownStyle = ComboBoxStyle.DropDownList;
this.DrawMode = DrawMode.OwnerDrawFixed;
}
protected override void OnDrawItem(DrawItemEventArgs e)
{
float[] dashValues = { 5, 2, 15, 4 };
if (e.Index > -1)
{
int startX = e.Bounds.Left + 5;
int startY = (e.Bounds.Y + e.Bounds.Height/2);
int endX = e.Bounds.Right - 5;
int endY = (e.Bounds.Y + e.Bounds.Height/2);
using (SolidPen = new Pen(Color.Blue, (Int32)this.Items[e.Index]))
{
e.Graphics.DrawLine(SolidPen, new Point(startX, startY), new Point(endX, endY));
}
using (DashedPen = new Pen(Color.Blue, (Int32)this.Items[e.Index]))
{
e.Graphics.DrawLine(DashedPen, new Point(startX, startY), new Point(endX, endY));
DashedPen.DashPattern = dashValues;
}
}
base.OnDrawItem(e);
}
}
在另一種形式,我需要用這個LineStyleComboBox,我將如何添加一組鋼筆樣式作爲項目。 這是爲了讓我可以使用線條樣式作爲項目(純色筆,虛線筆)來實現組合框。
private void frmDlgGraphOptions_Load(object sender, EventArgs e)
{
lineStyleComboBox2.Items.Add(solidpen,dashed pen)
}