[英]Close button for TabPages of Right To Left TabControl c#
我想向TabControl
TabPages
添加一个关闭按钮。 我尝试此代码,并且可以使用从左到右的TabControl正常工作:
private Point _imageLocation = new Point(13, 5);
private Point _imgHitArea = new Point(13, 2);
this.tabControl2.DrawMode = System.Windows.Forms.TabDrawMode.OwnerDrawFixed;
tabControl2.DrawItem += TabControl2_DrawItem;
private void TabControl2_DrawItem(object sender, System.Windows.Forms.DrawItemEventArgs e)
{
try
{
Image img = new Bitmap(GestionP.Properties.Resources.Close);
Rectangle r = e.Bounds;
r = this.tabControl2.GetTabRect(e.Index);
r.Offset(2, 2);
Brush TitleBrush = new SolidBrush(Color.Black);
Font f = this.Font;
string title = this.tabControl2.TabPages[e.Index].Text;
e.Graphics.DrawString(title, f, TitleBrush, new PointF(r.X, r.Y));
if (tabControl2.SelectedIndex >= 1)
{
e.Graphics.DrawImage(img, new Point(r.X + (this.tabControl2.GetTabRect(e.Index).Width - _imageLocation.X), _imageLocation.Y));
}
}
catch (Exception) { }
}
private void tabControl2_MouseClick(object sender, MouseEventArgs e)
{
TabControl tc = (TabControl)sender;
Point p = e.Location;
int _tabWidth = 0;
_tabWidth = this.tabControl2.GetTabRect(tc.SelectedIndex).Width - (_imgHitArea.X);
Rectangle r = this.tabControl2.GetTabRect(tc.SelectedIndex);
r.Offset(_tabWidth, _imgHitArea.Y);
r.Width = 16;
r.Height = 16;
if (tabControl2.SelectedIndex >= 1)
{
if (r.Contains(p))
{
TabPage TabP = (TabPage)tc.TabPages[tc.SelectedIndex];
tc.TabPages.Remove(TabP);
}
}
}
但是,当我设置属性RightToLeftLayout = true
和RightToLeft = true
它不起作用, TabPage
标题不会出现,也不会关闭按钮。
那么如何以接受RightToLeft
属性的方式修复代码?
您可以创建一个函数来将矩形的坐标转换为容器中的RTL坐标:
public static Rectangle GetRTLCoordinates(Rectangle container, Rectangle drawRectangle)
{
return new Rectangle(
container.Width - drawRectangle.Width - drawRectangle.X,
drawRectangle.Y,
drawRectangle.Width,
drawRectangle.Height);
}
并且在RTL模式下绘画时,可以通过以下方式计算坐标:
tabRect = GetRTLCoordinates(this.tabControl2.ClientRectangle, tabRect);
此外,您还应该使用StringFormat
绘制字符串,并将其设置为在RTL模式下使用StringFormatFlags.DirectionRightToLeft
,并使用字符串格式在已翻译的矩形中绘制字符串:
e.Graphics.DrawString(this.tabControl2.TabPages[e.Index].Text,
this.Font, Brushes.Black, tabRect, sf);
您可以将所有代码封装在继承TabControl
的CustomTabControl
。
屏幕截图
整个代码可以是:
我想您在诸如Properties.Default.Close
地方有一个关闭图像,并将其分配给this.CloseImage
。 这是我使用的图像:
我还设置了this.tabControl2.Padding = new Point(10, 3);
提供额外的可用空间来绘制图像。
您也可以简单地添加不关闭第一个标签的条件。
Image CloseImage;
private void Form1_Load(object sender, EventArgs e)
{
this.tabControl2.DrawMode = System.Windows.Forms.TabDrawMode.OwnerDrawFixed;
tabControl2.DrawItem += TabControl2_DrawItem;
tabControl2.MouseClick += tabControl2_MouseClick;
CloseImage = Properties.Resources.Close;
this.tabControl2.Padding = new Point(10, 3);
}
private void TabControl2_DrawItem(object sender,
System.Windows.Forms.DrawItemEventArgs e)
{
try
{
var tabRect = this.tabControl2.GetTabRect(e.Index);
tabRect.Inflate(-2, -2);
var imageRect = new Rectangle(tabRect.Right - CloseImage.Width,
tabRect.Top + (tabRect.Height - CloseImage.Height) / 2,
CloseImage.Width,
CloseImage.Height);
var sf = new StringFormat(StringFormat.GenericDefault);
if (this.tabControl2.RightToLeft == System.Windows.Forms.RightToLeft.Yes &&
this.tabControl2.RightToLeftLayout == true)
{
tabRect = GetRTLCoordinates(this.tabControl2.ClientRectangle, tabRect);
imageRect = GetRTLCoordinates(this.tabControl2.ClientRectangle, imageRect);
sf.FormatFlags |= StringFormatFlags.DirectionRightToLeft;
}
e.Graphics.DrawString(this.tabControl2.TabPages[e.Index].Text,
this.Font, Brushes.Black, tabRect, sf);
e.Graphics.DrawImage(CloseImage, imageRect.Location);
}
catch (Exception) { }
}
private void tabControl2_MouseClick(object sender, MouseEventArgs e)
{
for (var i = 0; i < this.tabControl2.TabPages.Count; i++)
{
var tabRect = this.tabControl2.GetTabRect(i);
tabRect.Inflate(-2, -2);
var imageRect = new Rectangle(tabRect.Right - CloseImage.Width,
tabRect.Top + (tabRect.Height - CloseImage.Height) / 2,
CloseImage.Width,
CloseImage.Height);
if (imageRect.Contains(e.Location))
{
this.tabControl2.TabPages.RemoveAt(i);
break;
}
}
}
public static Rectangle GetRTLCoordinates(Rectangle container, Rectangle drawRectangle)
{
return new Rectangle(
container.Width - drawRectangle.Width - drawRectangle.X,
drawRectangle.Y,
drawRectangle.Width,
drawRectangle.Height);
}
无需覆盖图形:
1.选择选项卡控件。
2.设置RightToLeft
属性yes
与 RightToLeftLayout
属性为true
。
现在所有标签页都从右到左对齐(诀窍是必须将RightToLeft
和RightToLeftLayout
属性设置为更改,不知道为什么Microsoft会这样做...)
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