ComboBox DropDownList以及图片和文本中的项目 [英] ComboBox DropDownList and items from picture and text

问题描述

我在WindowsForms中有一个ComboBox，并且我手动绘制项目。每个项目均由图片和文字组成，因此项目的高度为34像素。

I have a ComboBox in WindowsForms and I draw items manually. Each item is composed from picture and text, so item is 34 px height.

我想将ComboBox的DropDownStyle设置为DropDownList以启用用户输入。但是，当我选择某些项目时，它会变形，因为图片和文本是可见的。而且我只想在用户选择某些项目时显示文本。

I want to set DropDownStyle of ComboBox to DropDownList to enable user input. But when I select some of the item, it is deformed, because picture and text is visible. And I want to display only text if user select some item.

protected override void OnDrawItem(DrawItemEventArgs e)
        {

            e.DrawBackground();

            if (e.Index > -1)
            {

                Piece item = this.Items[e.Index] as Piece;


                e.Graphics.FillRectangle(Brushes.Gray, new Rectangle(e.Bounds.Left + 6, e.Bounds.Top + 6, 22, 22));

                e.Graphics.DrawImage(item.Image, new Rectangle(e.Bounds.Left + 7, e.Bounds.Top + 7, 20, 20));

                e.Graphics.DrawString(item.Title, e.Font, 
                    new SolidBrush(e.ForeColor), e.Bounds.Left + 34, e.Bounds.Top + 10);

            }

            e.DrawFocusRectangle();

        }

谢谢

推荐答案

1）您是说DropDown的DropDownStyle吗？

1) Do you mean DropDownStyle of DropDown? This is the setting which enables user input.

2）变形是什么意思-您在哪里看到它？

2) What do you mean by 'deformed' - and where are you seeing this?

编辑：如果此OnDrawItem调用是为了渲染顶部框-e.State设置了ComboBoxEdit位标志。

If this OnDrawItem call is to render the top box - e.State has the ComboBoxEdit bit flag set. Check for this to render differently.

if( (e.State & DrawItemState.ComboBoxEdit) != DrawItemState.ComboBoxEdit ) 
{
    // Do drawing logic just for the top edit part
}
else
{
    // Draw logic here for rendering in the drop-down
}

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