如何在列表框中的特定情况下为特定项目的文本着色
本文关键字:项目 文本 情况下 列表 | 更新日期: 2023-09-27 18:33:14
我有这个方法:
private void batch_Resize(Image sourceImage,string oldfName, string sourceDirectory,string oldFileName)
{
Bitmap newImage = new Bitmap(512, 512);
using (Graphics gr = Graphics.FromImage(newImage))
{
gr.SmoothingMode = SmoothingMode.AntiAlias;
gr.InterpolationMode = InterpolationMode.HighQualityBicubic;
gr.PixelOffsetMode = PixelOffsetMode.HighQuality;
gr.DrawImage(sourceImage, new Rectangle(0, 0, newImage.Width, newImage.Height));
i = i + 1;
newImage.Save(@"d:'NewImages1'" + i.ToString("D6") + ".gif", System.Drawing.Imaging.ImageFormat.Gif);
newImage.Save(@"d:'NewImages1'" + oldfName + ".gif", System.Drawing.Imaging.ImageFormat.Gif);
string filesExit = sourceDirectory + "''"+ oldfName + ".gif";
if (!File.Exists(filesExit))
{
newImage.Save(sourceDirectory + "''" + oldfName + ".gif", System.Drawing.Imaging.ImageFormat.Gif);
}
else
{
itemToColor = "File already exist and was not overwritten:";
listBox1.Invoke(new MethodInvoker(delegate { listBox1.Items.Add("File already exist and was not overwritten: " + oldfName); }));
}
}
if (newImage != null)
newImage.Dispose();
}
我想将调用的项目涂成红色:
listBox1.Invoke(new MethodInvoker(delegate { listBox1.Items.Add("File already exist and was not overwritten: " + oldfName); }));
我想用红色颜色文本:文件已经存在并且没有被覆盖:
我在设计器中将列表框1绘制模式更改为OwnderDrawFixed并增加了抽奖项目事件。
在抽奖项目事件中,我做到了:
private void listBox1_DrawItem(object sender, DrawItemEventArgs e)
{
e.DrawBackground();
Graphics g = e.Graphics;
g.FillRectangle(new SolidBrush(Color.Olive), e.Bounds);
g.DrawString(itemToColor, e.Font, new SolidBrush(e.ForeColor), new PointF(e.Bounds.X, e.Bounds.Y));
}
itemToColor 是 form1 中的全局字符串,我想为文本着色:
itemToColor = "File already exist and was not overwritten:";
listBox1.Invoke(new MethodInvoker(delegate { listBox1.Items.Add("File already exist and was not overwritten: " + oldfName); }));
但它不起作用。
如何仅将调用中的文本着色为红色?文件已存在且未被覆盖:因此,如果出现,它只会在方法中出现时为其着色。
如果您没有任何其他指标哪些项目应该为红色,这里是低技术方法:
string itemToColor = "File already exist and was not overwritten.";
使用列表视图(因为我误读了你),这将是代码:
private void listView1_DrawItem(object sender, DrawItemEventArgs e)
{
if (e.Item.Text != itemToColor ) e.DrawDefault = true;
else
{
e.DrawBackground();
// e.Graphics.FillRectangle(new SolidBrush(Color.Olive), e.Bounds); // optional
e.Graphics.DrawString(itemToColor, listView1.Font,
Brushes.Red, new PointF(e.Bounds.X, e.Bounds.Y));
}
}
注意:根据您的需要,您可能还需要编写DrawHeader
和DrawSubItem
事件!
由于您实际上使用的是旧的ListBox,因此此处与ListBox.DrawItem
事件的代码相同:
private void listBox1_DrawItem(object sender, DrawItemEventArgs e)
{
SolidBrush brush = null;
if (listBox1.Items[e.Index].ToString() != itemToColor )
brush = new SolidBrush(e.ForeColor);
else brush = new SolidBrush(Color.Red);
e.DrawBackground();
e.Graphics.DrawString(listBox1.Items[e.Index].ToString(),
e.Font, brush, new PointF(e.Bounds.X, e.Bounds.Y));
}
不确定你是否真的想用橄榄画背景。如果是这样,您可以轻松地稍微更改一下cvode。
但是项目列表或项目索引或设置标签可能更符合您的喜好。
这是一个工作示例代码
请记住将 DrawMode 更改为 OwnerDrawFixed 并处理 DrawItem 事件。
/// <summary>
/// Handles the DrawItem event of the listBox1 control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="System.Windows.Forms.DrawItemEventArgs"/> instance containing the event data.</param>
private void listBox1_DrawItem( object sender, DrawItemEventArgs e )
{
e.DrawBackground();
Graphics g = e.Graphics;
// draw the background color you want
// mine is set to olive, change it to whatever you want
g.FillRectangle( new SolidBrush( Color.Olive), e.Bounds );
// draw the text of the list item, not doing this will only show
// the background color
// you will need to get the text of item to display
g.DrawString( THE_LIST_ITEM_TEXT , e.Font, new SolidBrush( e.ForeColor ), new PointF( e.Bounds.X, e.Bounds.Y) );
e.DrawFocusRectangle();
}
可能缺少e.DrawFocusRectangle()导致了问题。