如何在TTabcontrol中隐藏多个选项卡 [英] How to hide multiple tabs in TTabcontrol

问题描述

我的程序有3个下拉菜单和1个ttabcontrol，其中有5个选项卡。我需要知道的是，如果下拉菜单选择了特定项目，如何隐藏所有选项卡并再次设置其可见性。
例如
我的下拉列表的索引项为。
A，B，C，A + B，A + C
TabControl具有以下选项卡。
A B C
现在，我需要隐藏所有选项卡，如果下拉菜单选择了a或& ;，则取消隐藏选项卡A。 b如果将下拉列表选择为A + B。

My program has three drop-down and one ttabcontrol which has 5 Tabs. what i need to know is how can i hide all the tabs and set their visiblety back again if drop-down menu has a particular item selected. For example My drop-down has index item of. A , B , C , A+B , A+C TabControl had following tabs. A B C Now i need to hide all the tabs and unhide tab A if drop down has selected a or a & b if dropdown is Selected to A+ B.

推荐答案

使用可枚举类型进行操作。您可以非常轻松地探索布尔操作。

use enumerable type to do that. You can explore boolean operation very easy.

TYPE
TabControlTag = (A, B, C);
TabTags = set of TabControlTag;
TForm1=class(TForm)
...

实施

procedure TForm1.HideTabControl(Sender: TObject);
{hide all tabItem in tabControl}
var
   i: integer;
begin
   for i := 0 to TabControl1.ComponentCount - 1 do
      if TabControl1.Components[i] is TTabItem then
         with TabControl1.Components[i] do
         begin
            visible := false;
         end;
end;

如果您使用 TCombobox 作为下拉列表，请使用 OnChange 事件

if you are using TCombobox as dropDown list, use the OnChange event

procedure TForm1.ComboBox1Change(Sender: TObject);
var
   Tabs: TabTags;
begin
   case ComboBox1.ItemIndex of
      0: { A } Tabs := [A];
      1: { B } Tabs := [B];
      2: { C } Tabs := [C];
      3: { A+B } Tabs := [A,B];
      4: { A+C } Tabs := [A,C];
   end;
   if A in Tabs then  tabItem1.Visible:=true;
   if B in Tabs then  tabItem2.Visible:=true;
   if C in Tabs then  tabItem3.Visible:=true;
end;

一个非常灵活且可扩展的解决方案。

A very flexible and expansible solution.

例如，使用 TCheckbox

var
   Tabs: TabTags;
begin
tabs:=[];
If checkBoxA.IsChecked then TabTags:= [A];
If checkBoxB.IsChecked then TabTags:= TabTags + [B];//OR boolean operations. Also allowed [A,B] * [A] which means AND, [A,B] - [A] which means NOR,
If checkBoxC.IsChecked then Include(TabTags,C)
if A in Tabs then  tabItem1.Visible:=true;
if B in Tabs then  tabItem2.Visible:=true;
if C in Tabs then  tabItem3.Visible:=true;
end

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