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TabBar: Use mouse position instead of hardcoded +1/-1 offset when reordering tabs.

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Fixes tab reordering in test engine when using fast mode.
This commit is contained in:
Rokas Kupstys
2021-03-22 10:55:59 +02:00
committed by ocornut
parent a58271c079
commit 475c0fcc39
2 changed files with 59 additions and 5 deletions
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63
imgui_widgets.cpp
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@@ -7447,6 +7447,50 @@ void ImGui::TabBarQueueReorder(ImGuiTabBar* tab_bar, const ImGuiTabItem* tab, in
tab_bar->ReorderRequestDir = (ImS8)dir;
}
void ImGui::TabBarQueueReorderFromMousePos(ImGuiTabBar* tab_bar, const ImGuiTabItem* tab, ImVec2 mouse_pos)
{
ImGuiContext& g = *GImGui;
IM_ASSERT(tab_bar->ReorderRequestTabId == 0);
if ((tab_bar->Flags & ImGuiTabBarFlags_Reorderable) == 0)
return;
int source_idx = tab_bar->Tabs.index_from_ptr(tab);
float bar_x = tab_bar->BarRect.Min.x;
int dir = bar_x + tab->Offset > mouse_pos.x ? -1 : +1;
int target_idx = source_idx;
for (int i = source_idx; 0 <= i && i < tab_bar->Tabs.Size; i += dir)
{
const ImGuiTabItem* target_tab = &tab_bar->Tabs[i];
// Reorder only within tab groups with _Leading, _Trailing flag or without either of them.
if ((target_tab->Flags & ImGuiTabItemFlags_Leading) != (tab->Flags & ImGuiTabItemFlags_Leading))
break;
if ((target_tab->Flags & ImGuiTabItemFlags_Trailing) != (tab->Flags & ImGuiTabItemFlags_Trailing))
break;
// Do not reorder past tabs with _NoReorder flag.
if (target_tab->Flags & ImGuiTabItemFlags_NoReorder)
break;
target_idx = i; // target_tab can be swapped with dragged tab.
// Current tab is destination tab under mouse position. Also include space after tab, so when mouse cursor is
// between tabs we would not continue checking further tabs that are not hovered.
if (dir > 0 && mouse_pos.x < bar_x + target_tab->Offset + target_tab->Width + g.Style.ItemInnerSpacing.x) // End of tab is past mouse_pos.
break;
if (dir < 0 && mouse_pos.x > bar_x + target_tab->Offset - g.Style.ItemInnerSpacing.x) // Mouse pos is past start of tab.
break;
}
if (target_idx != source_idx)
{
tab_bar->ReorderRequestTabId = tab->ID;
tab_bar->ReorderRequestDir = (ImS8)(target_idx - source_idx);
}
}
bool ImGui::TabBarProcessReorder(ImGuiTabBar* tab_bar)
{
ImGuiTabItem* tab1 = TabBarFindTabByID(tab_bar, tab_bar->ReorderRequestTabId);
@@ -7466,7 +7510,18 @@ bool ImGui::TabBarProcessReorder(ImGuiTabBar* tab_bar)
return false;
ImGuiTabItem item_tmp = *tab1;
*tab1 = *tab2;
ImGuiTabItem* src, *dst;
if (tab_bar->ReorderRequestDir > 0)
{
dst = tab1;
src = tab1 + 1;
}
else
{
dst = tab2 + 1;
src = tab2;
}
memmove(dst, src, abs(tab_bar->ReorderRequestDir) * sizeof(ImGuiTabItem));
*tab2 = item_tmp;
if (tab_bar->Flags & ImGuiTabBarFlags_SaveSettings)
@@ -7796,13 +7851,11 @@ bool ImGui::TabItemEx(ImGuiTabBar* tab_bar, const char* label, bool* p_open,
// While moving a tab it will jump on the other side of the mouse, so we also test for MouseDelta.x
if (g.IO.MouseDelta.x < 0.0f && g.IO.MousePos.x < bb.Min.x)
{
if (tab_bar->Flags & ImGuiTabBarFlags_Reorderable)
TabBarQueueReorder(tab_bar, tab, -1);
TabBarQueueReorderFromMousePos(tab_bar, tab, g.IO.MousePos);
}
else if (g.IO.MouseDelta.x > 0.0f && g.IO.MousePos.x > bb.Max.x)
{
if (tab_bar->Flags & ImGuiTabBarFlags_Reorderable)
TabBarQueueReorder(tab_bar, tab, +1);
TabBarQueueReorderFromMousePos(tab_bar, tab, g.IO.MousePos);
}
}
}