的TabControl和边框的视觉干扰 [英] TabControl and borders visual glitch

问题描述

我对每个这些视觉毛刺的TabControls 时，我改变了的TabPages 背景色和背景色的形式，对下面的图像所示：

I have these visual glitches on every tabControls when I am changing its tabPages BackColor and the BackColor of the form, as illustrated on the following images:

• 在 Tab页，有一个内部的一个像素的白色边框。
顶部

• 在的 Tab页，有一个内部的三个像素白色边框的左侧。


• 在底部的 Tab页，有一个内部的一个像素的白色边框和外部两个像素的白色边框。


• 在右侧的 Tab页，有一个内部的一个像素的白色边框和外部两个像素的白色边框。

• At the top of the tabPage, there is an interior one-pixel white border.
• At the left of the tabPage, there is an interior three-pixels white border.
• At the bottom of the tabPage, there is an interior one-pixel white border and an exterior two-pixels white border.
• At the right of the tabPage, there is an interior one-pixel white border and an exterior two-pixels white border.

有没有一种方法可以让我摆脱那些白色边框的？

Is there a way I can get rid of those white borders?

推荐答案

下面是我的企图的黑客。我用了一个的NativeWindow 绘制在的TabControl 填写的白的空间。我不会声称它是完美的：

Here's my attempted hack. I used a NativeWindow to draw over the TabControl to fill in those "white" spaces. I won't claim it's perfect:

public class TabPadding : NativeWindow {
  private const int WM_PAINT = 0xF;

  private TabControl tabControl;

  public TabPadding(TabControl tc) {
    tabControl = tc;
    tabControl.Selected += new TabControlEventHandler(tabControl_Selected);
    AssignHandle(tc.Handle);
  }

  void tabControl_Selected(object sender, TabControlEventArgs e) {
    tabControl.Invalidate();
  }

  protected override void WndProc(ref Message m) {
    base.WndProc(ref m);

    if (m.Msg == WM_PAINT) {
      using (Graphics g = Graphics.FromHwnd(m.HWnd)) {

        //Replace the outside white borders:
        if (tabControl.Parent != null) {
          g.SetClip(new Rectangle(0, 0, tabControl.Width - 2, tabControl.Height - 1), CombineMode.Exclude);
          using (SolidBrush sb = new SolidBrush(tabControl.Parent.BackColor))
          g.FillRectangle(sb, new Rectangle(0, 
                                            tabControl.ItemSize.Height + 2,
                                            tabControl.Width,
                                            tabControl.Height - (tabControl.ItemSize.Height + 2)));
        }

        //Replace the inside white borders:
        if (tabControl.SelectedTab != null) {
          g.ResetClip();
          Rectangle r = tabControl.SelectedTab.Bounds;
          g.SetClip(r, CombineMode.Exclude);
          using (SolidBrush sb = new SolidBrush(tabControl.SelectedTab.BackColor))
            g.FillRectangle(sb, new Rectangle(r.Left - 3,
                                              r.Top - 1,
                                              r.Width + 4,
                                              r.Height + 3));
        }
      }
    }
  }
}

和把它挂：

public Form1() {
  InitializeComponent();
  var tab = new TabPadding(tabControl1);
}

我的最终结果是：

My end result:

这篇关于的TabControl和边框的视觉干扰的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！