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Nav: Extract part of NavUpdate() into a saner NavScrollToBringItemIntoView() (#787)

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This commit is contained in:
omar 2017-10-11 20:28:16 +02:00
parent 7a14d7dfdc
commit 2047c58efb
1 changed files with 39 additions and 32 deletions
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71
imgui.cpp
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@ -2611,6 +2611,42 @@ static ImVec2 GetNavInputAmount2d(int stick_no, ImGuiNavReadMode mode, float slo
return delta;
}
// NB: We modify rect_rel by the amount we scrolled for, so it is immediately updated.
static void NavScrollToBringItemIntoView(ImGuiWindow* window, ImRect& item_rect_rel)
{
// Scroll to keep newly navigated item fully into view
ImRect window_rect_rel(window->InnerRect.Min - window->Pos - ImVec2(1, 1), window->InnerRect.Max - window->Pos + ImVec2(1, 1));
//g.OverlayDrawList.AddRect(window->Pos + window_rect_rel.Min, window->Pos + window_rect_rel.Max, IM_COL32_WHITE); // [DEBUG]
if (window_rect_rel.Contains(item_rect_rel))
return;
ImGuiContext& g = *GImGui;
if (window->ScrollbarX && item_rect_rel.Min.x < window_rect_rel.Min.x)
{
window->ScrollTarget.x = item_rect_rel.Min.x + window->Scroll.x - g.Style.ItemSpacing.x;
window->ScrollTargetCenterRatio.x = 0.0f;
}
else if (window->ScrollbarX && item_rect_rel.Max.x >= window_rect_rel.Max.x)
{
window->ScrollTarget.x = item_rect_rel.Max.x + window->Scroll.x + g.Style.ItemSpacing.x;
window->ScrollTargetCenterRatio.x = 1.0f;
}
if (item_rect_rel.Min.y < window_rect_rel.Min.y)
{
window->ScrollTarget.y = item_rect_rel.Min.y + window->Scroll.y - g.Style.ItemSpacing.y;
window->ScrollTargetCenterRatio.y = 0.0f;
}
else if (item_rect_rel.Max.y >= window_rect_rel.Max.y)
{
window->ScrollTarget.y = item_rect_rel.Max.y + window->Scroll.y + g.Style.ItemSpacing.y;
window->ScrollTargetCenterRatio.y = 1.0f;
}
// Estimate upcoming scroll so we can offset our relative mouse position so mouse position can be applied immediately (under this block)
ImVec2 next_scroll = CalcNextScrollFromScrollTargetAndClamp(window);
item_rect_rel.Translate(window->Scroll - next_scroll);
}
static void NavUpdate()
{
ImGuiContext& g = *GImGui;
@ -2634,39 +2670,10 @@ static void NavUpdate()
// Process navigation move request
if (g.NavMoveRequest && g.NavMoveResultId != 0)
{
IM_ASSERT(g.NavWindow);
ImGuiWindow* window = g.NavWindow;
// Scroll to keep newly navigated item fully into view
ImRect window_rect_rel(window->InnerRect.Min - window->Pos - ImVec2(1,1), window->InnerRect.Max - window->Pos + ImVec2(1,1));
//g.OverlayDrawList.AddRect(window->Pos + window_rect_rel.Min, window->Pos + window_rect_rel.Max, IM_COL32_WHITE); // [DEBUG]
if (g.NavLayer == 0 && !window_rect_rel.Contains(g.NavMoveResultRectRel))
{
if (window->ScrollbarX && g.NavMoveResultRectRel.Min.x < window_rect_rel.Min.x)
{
window->ScrollTarget.x = g.NavMoveResultRectRel.Min.x + window->Scroll.x - g.Style.ItemSpacing.x;
window->ScrollTargetCenterRatio.x = 0.0f;
}
else if (window->ScrollbarX && g.NavMoveResultRectRel.Max.x >= window_rect_rel.Max.x)
{
window->ScrollTarget.x = g.NavMoveResultRectRel.Max.x + window->Scroll.x + g.Style.ItemSpacing.x;
window->ScrollTargetCenterRatio.x = 1.0f;
}
if (g.NavMoveResultRectRel.Min.y < window_rect_rel.Min.y)
{
window->ScrollTarget.y = g.NavMoveResultRectRel.Min.y + window->Scroll.y - g.Style.ItemSpacing.y;
window->ScrollTargetCenterRatio.y = 0.0f;
}
else if (g.NavMoveResultRectRel.Max.y >= window_rect_rel.Max.y)
{
window->ScrollTarget.y = g.NavMoveResultRectRel.Max.y + window->Scroll.y + g.Style.ItemSpacing.y;
window->ScrollTargetCenterRatio.y = 1.0f;
}
// Estimate upcoming scroll so we can offset our relative mouse position so mouse position can be applied immediately (under this block)
ImVec2 next_scroll = CalcNextScrollFromScrollTargetAndClamp(window);
g.NavMoveResultRectRel.Translate(window->Scroll - next_scroll);
}
IM_ASSERT(g.NavWindow);
if (g.NavLayer == 0)
NavScrollToBringItemIntoView(g.NavWindow, g.NavMoveResultRectRel);
// Apply result from previous frame navigation directional move request
ImGui::ClearActiveID();