016-imGui窗口中的页面控件Tab

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学习目标:
   页面控件Tab //mfc CTabControl
   BeginTabBar EndTabBar
   BeginTabItem EndTabItem


    // Flags for ImGui::BeginTabBar()
enum ImGuiTabBarFlags_
{
    ImGuiTabBarFlags_None                           = 0,
    ImGuiTabBarFlags_Reorderable                    = 1 << 0,   // Allow manually dragging tabs to re-order them + New tabs are appended at the end of list
    ImGuiTabBarFlags_AutoSelectNewTabs              = 1 << 1,   // Automatically select new tabs when they appear
    ImGuiTabBarFlags_TabListPopupButton             = 1 << 2,   // Disable buttons to open the tab list popup
    ImGuiTabBarFlags_NoCloseWithMiddleMouseButton   = 1 << 3,   // Disable behavior of closing tabs (that are submitted with p_open != NULL) with middle mouse button. You can still repro this behavior on user's side with if (IsItemHovered() && IsMouseClicked(2)) *p_open = false.
    ImGuiTabBarFlags_NoTabListScrollingButtons      = 1 << 4,   // Disable scrolling buttons (apply when fitting policy is ImGuiTabBarFlags_FittingPolicyScroll)
    ImGuiTabBarFlags_NoTooltip                      = 1 << 5,   // Disable tooltips when hovering a tab
    ImGuiTabBarFlags_FittingPolicyResizeDown        = 1 << 6,   // Resize tabs when they don't fit
    ImGuiTabBarFlags_FittingPolicyScroll            = 1 << 7,   // Add scroll buttons when tabs don't fit
    ImGuiTabBarFlags_FittingPolicyMask_             = ImGuiTabBarFlags_FittingPolicyResizeDown | ImGuiTabBarFlags_FittingPolicyScroll,
    ImGuiTabBarFlags_FittingPolicyDefault_          = ImGuiTabBarFlags_FittingPolicyResizeDown,
};


   
       
//ImGuiTabBarFlags_TabListPopupButton 带了一个下拉列表
void CDX11::测试页面UI()
{
     ImGui::Begin(u8"测试页面UI");

     if (ImGui::BeginTabBar("MyTabBar", 0))
     {
         if (ImGui::BeginTabItem("1111"))
         {
             //显示页面1的控件
             static bool v1 = 0;
             ImGui::Checkbox("11111", &v1);
             ImGui::EndTabItem();
         };
         if(ImGui::BeginTabItem("2222"))
         {
            // 显示页面2的控件
             static bool v1 = 0;
             ImGui::Checkbox("2222", &v1);
             ImGui::Button("2222" );

             ImGui::EndTabItem();
         };
        if(ImGui::BeginTabItem("3333"))
         {
             ImGui::EndTabItem();
         };

        if( ImGui::BeginTabItem("4444"))
         {
             ImGui::EndTabItem();
         };

         ImGui::EndTabBar();
     }
     ImGui::End();


};



enum ImGuiTabBarFlags_
{
    ImGuiTabBarFlags_None                           = 0,
    ImGuiTabBarFlags_Reorderable                    = 1 << 0,   // Allow manually dragging tabs to re-order them + New tabs are appended at the end of list
    ImGuiTabBarFlags_AutoSelectNewTabs              = 1 << 1,   // Automatically select new tabs when they appear
    ImGuiTabBarFlags_TabListPopupButton             = 1 << 2,   // Disable buttons to open the tab list popup
    ImGuiTabBarFlags_NoCloseWithMiddleMouseButton   = 1 << 3,   // Disable behavior of closing tabs (that are submitted with p_open != NULL) with middle mouse button. You can still repro this behavior on user's side with if (IsItemHovered() && IsMouseClicked(2)) *p_open = false.
    ImGuiTabBarFlags_NoTabListScrollingButtons      = 1 << 4,   // Disable scrolling buttons (apply when fitting policy is ImGuiTabBarFlags_FittingPolicyScroll)
    ImGuiTabBarFlags_NoTooltip                      = 1 << 5,   // Disable tooltips when hovering a tab
    ImGuiTabBarFlags_FittingPolicyResizeDown        = 1 << 6,   // Resize tabs when they don't fit
    ImGuiTabBarFlags_FittingPolicyScroll            = 1 << 7,   // Add scroll buttons when tabs don't fit
    ImGuiTabBarFlags_FittingPolicyMask_             = ImGuiTabBarFlags_FittingPolicyResizeDown | ImGuiTabBarFlags_FittingPolicyScroll,
    ImGuiTabBarFlags_FittingPolicyDefault_          = ImGuiTabBarFlags_FittingPolicyResizeDown,
};


enum ImGuiTabItemFlags_
{
    ImGuiTabItemFlags_None                          = 0,
    ImGuiTabItemFlags_UnsavedDocument               = 1 << 0,   
        // Display a dot next to the title + tab is selected when clicking the X + closure is not assumed (will wait for user to stop submitting the tab). Otherwise closure is assumed when pressing the X, so if you keep submitting the tab may reappear at end of tab bar.
    ImGuiTabItemFlags_SetSelected                   = 1 << 1,   
        // Trigger flag to programmatically make the tab selected when calling BeginTabItem()
    ImGuiTabItemFlags_NoCloseWithMiddleMouseButton  = 1 << 2,   // Disable behavior of closing tabs (that are submitted with p_open != NULL) with middle mouse button. You can still repro this behavior on user's side with if (IsItemHovered() && IsMouseClicked(2)) *p_open = false.
    ImGuiTabItemFlags_NoPushId                      = 1 << 3,   // Don't call PushID(tab->ID)/PopID() on BeginTabItem()/EndTabItem()
    ImGuiTabItemFlags_NoTooltip                     = 1 << 4,   // Disable tooltip for the given tab
    ImGuiTabItemFlags_NoReorder                     = 1 << 5,   // Disable reordering this tab or having another tab cross over this tab
    ImGuiTabItemFlags_Leading                       = 1 << 6,   // Enforce the tab position to the left of the tab bar (after the tab list popup button)
    ImGuiTabItemFlags_Trailing                      = 1 << 7,   // Enforce the tab position to the right of the tab bar (before the scrolling buttons)
};