如何解决TabControl填充会导致TabPage中的隐藏控件错误地重新排序
更改Handles的{{1}}属性后，尚未创建Parent的控件似乎被推到其Control TabControl的底部。看着Padding源代码，.NET调用了Padding，这似乎与它有关。
下面是说明问题的代码。每个RecreateHandle();在其下方都有一个对应的checkBox。有些标签在一开始是可见的，有些则是隐藏的。选中label复选框会使person0标签出现，但在底部显示不正确。取而代之的是，person0标签应该出现在person0复选框的正下方，这是将其添加到person0的顺序。查看屏幕截图。
代码提供了FlowLayoutPanel选项，但是必须有更好的方法。强制使用bool doWorkaround创建所有Handles似乎也不正确。
CreateControl()我使用using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Windows.Forms;
namespace WindowsFormsApplication3 {
public class TabControl3 : TabControl {
private bool doWorkaround = false; // set to true to prevent the bug
protected override void OnFontChanged(EventArgs e) {
base.OnFontChanged(e);
int h = (int) this.Font.Height;
SetPadding(new Point(h,h)); // calling this causes the Controls to re-order incorrectly
}
///<summary>Setting the padding causes the TabControl to recreate all the handles,which causes the hidden handleless controls to rearrange.</summary>
public virtual void SetPadding(Point pt) {
// Workaround solution: remove all controls from tab pages and then add them back after.
int n = TabPages.Count;
Control[][] arr = null;
if (doWorkaround) {
arr = new Control[n][];
for (int i = 0; i < n; i++) {
TabPage tp = TabPages[i];
arr[i] = tp.Controls.Cast<Control>().ToArray();
tp.Controls.Clear();
}
}
this.Padding = pt; // in the .NET source code,setting Padding calls RecreateHandle()
if (doWorkaround) {
for (int i = 0; i < n; i++)
TabPages[i].Controls.AddRange(arr[i]);
}
}
}
public class CheckBox2 : CheckBox {
public CheckBox2(String text,bool isChecked = false) : base() {
this.Text = text;
this.AutoSize = true;
this.Checked = isChecked;
}
}
public class Label2 : Label {
public Label2(String text) : base() {
this.Text = text;
this.AutoSize = true;
}
}
public class MyForm : Form {
TabControl tc = new TabControl3 { Dock = DockStyle.Fill };
public MyForm() {
this.Size = new System.Drawing.Size(600,800);
this.StartPosition = FormStartPosition.CenterScreen;
TabPage tp1 = new TabPage("Page1");
FlowLayoutPanel p = new FlowLayoutPanel { FlowDirection = System.Windows.Forms.FlowDirection.TopDown,Dock = DockStyle.Fill };
p.Controls.Add(new CheckBox2("Person0"));
p.Controls.Add(new Label2("Person0") { Visible = false });
p.Controls.Add(new CheckBox2("Person1",true));
p.Controls.Add(new Label2("Person1"));
p.Controls.Add(new CheckBox2("Person2",true));
p.Controls.Add(new Label2("Person2"));
p.Controls.Add(new CheckBox2("Person3"));
p.Controls.Add(new Label2("Person3") { Visible = false });
p.Controls.Add(new CheckBox2("Person4"));
p.Controls.Add(new Label2("Person4") { Visible = false });
for (int i = 0; i < p.Controls.Count; i += 2) {
CheckBox cb = (CheckBox) p.Controls[i];
Label lb = (Label) p.Controls[i+1];
cb.CheckedChanged += delegate {
bool b = cb.Checked;
lb.Visible = b;
};
}
tp1.Controls.Add(p);
tc.TabPages.Add(tp1);
Controls.Add(tc);
}
protected override void OnLoad(EventArgs e) {
base.OnLoad(e);
this.Font = SystemFonts.MenuFont; // to trigger the bug
}
}
static class Program {
[STAThread]
static void Main() {
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new MyForm());
}
}
}
进行了测试，在这三个方面都看到了相同的行为。
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