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TabBar: Reworked scrolling policy (when ImGuiTabBarFlags_FittingPolicyScroll is set) to teleport the view when aiming at a tab far away the visible section, and otherwise accelerate the scrolling speed to cap the scrolling time to 0.3 seconds.

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This commit is contained in:
omar
2019-03-12 20:57:02 +01:00
parent 99d8425173
commit 53e0c13be2
3 changed files with 26 additions and 4 deletions
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25
imgui_widgets.cpp
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@@ -6064,7 +6064,7 @@ ImGuiTabBar::ImGuiTabBar()
CurrFrameVisible = PrevFrameVisible = -1;
ContentsHeight = 0.0f;
OffsetMax = OffsetNextTab = 0.0f;
ScrollingAnim = ScrollingTarget = 0.0f;
ScrollingAnim = ScrollingTarget = ScrollingTargetDistToVisibility = ScrollingSpeed = 0.0f;
Flags = ImGuiTabBarFlags_None;
ReorderRequestTabId = 0;
ReorderRequestDir = 0;
@@ -6358,9 +6358,19 @@ static void ImGui::TabBarLayout(ImGuiTabBar* tab_bar)
TabBarScrollToTab(tab_bar, scroll_track_selected_tab);
tab_bar->ScrollingAnim = TabBarScrollClamp(tab_bar, tab_bar->ScrollingAnim);
tab_bar->ScrollingTarget = TabBarScrollClamp(tab_bar, tab_bar->ScrollingTarget);
const float scrolling_speed = (tab_bar->PrevFrameVisible + 1 < g.FrameCount) ? FLT_MAX : (g.IO.DeltaTime * g.FontSize * 70.0f);
if (tab_bar->ScrollingAnim != tab_bar->ScrollingTarget)
tab_bar->ScrollingAnim = ImLinearSweep(tab_bar->ScrollingAnim, tab_bar->ScrollingTarget, scrolling_speed);
{
// Scrolling speed adjust itself so we can always reach our target in 1/3 seconds.
// Teleport if we are aiming far off the visible line
tab_bar->ScrollingSpeed = ImMax(tab_bar->ScrollingSpeed, 70.0f * g.FontSize);
tab_bar->ScrollingSpeed = ImMax(tab_bar->ScrollingSpeed, ImFabs(tab_bar->ScrollingTarget - tab_bar->ScrollingAnim) / 0.3f);
const bool teleport = (tab_bar->PrevFrameVisible + 1 < g.FrameCount) || (tab_bar->ScrollingTargetDistToVisibility > 10.0f * g.FontSize);
tab_bar->ScrollingAnim = teleport ? tab_bar->ScrollingTarget : ImLinearSweep(tab_bar->ScrollingAnim, tab_bar->ScrollingTarget, g.IO.DeltaTime * tab_bar->ScrollingSpeed);
}
else
{
tab_bar->ScrollingSpeed = 0.0f;
}
// Clear name buffers
if ((tab_bar->Flags & ImGuiTabBarFlags_DockNode) == 0)
@@ -6438,10 +6448,17 @@ static void ImGui::TabBarScrollToTab(ImGuiTabBar* tab_bar, ImGuiTabItem* tab)
int order = tab_bar->GetTabOrder(tab);
float tab_x1 = tab->Offset + (order > 0 ? -margin : 0.0f);
float tab_x2 = tab->Offset + tab->Width + (order + 1 < tab_bar->Tabs.Size ? margin : 1.0f);
tab_bar->ScrollingTargetDistToVisibility = 0.0f;
if (tab_bar->ScrollingTarget > tab_x1)
{
tab_bar->ScrollingTargetDistToVisibility = ImMax(tab_bar->ScrollingAnim - tab_x2, 0.0f);
tab_bar->ScrollingTarget = tab_x1;
if (tab_bar->ScrollingTarget + tab_bar->BarRect.GetWidth() < tab_x2)
}
else if (tab_bar->ScrollingTarget < tab_x2 - tab_bar->BarRect.GetWidth())
{
tab_bar->ScrollingTargetDistToVisibility = ImMax((tab_x1 - tab_bar->BarRect.GetWidth()) - tab_bar->ScrollingAnim, 0.0f);
tab_bar->ScrollingTarget = tab_x2 - tab_bar->BarRect.GetWidth();
}
}
void ImGui::TabBarQueueChangeTabOrder(ImGuiTabBar* tab_bar, const ImGuiTabItem* tab, int dir)