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Navigation: Scoring: Improved directional navigation. Not totally cancelling out dx. Better support for zero-spaced items. (#323)

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This commit is contained in:
ocornut 2016-07-23 20:05:17 +02:00
parent e74d96642f
commit afadc7cf59
1 changed files with 10 additions and 9 deletions
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19
imgui.cpp
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@ -1921,9 +1921,8 @@ static bool NavScoreItem(ImRect cand)
// FIXME-NAVIGATION: Introducing various biases toward typical imgui uses cases, but we don't have any rigorous proof of their effect now.
float dbx = NavScoreItemDistInterval(cand.Min.x, cand.Max.x, curr.Min.x, curr.Max.x);
float dby = NavScoreItemDistInterval(ImLerp(cand.Min.y, cand.Max.y, 0.2f), ImLerp(cand.Min.y, cand.Max.y, 0.8f), ImLerp(curr.Min.y, curr.Max.y, 0.2f), ImLerp(curr.Min.y, curr.Max.y, 0.8f)); // Clamp down on Y to keep using box-distance for vertically touching items
//dbx /= 2; dby *= 4 // Bias for dy
if (dby)
dbx = (dbx > 0.0f) ? +0.0f : -0.0f;
if (dby && dbx)
dbx = (dbx/1000.0f) + ((dbx > 0.0f) ? +1.0f : -1.0f);
float dist_box = fabsf(dbx) + fabsf(dby);
// Compute distance between centers (this is off by a factor of 2, but we only compare center distances with each other so it doesn't matter)
@ -1957,7 +1956,6 @@ static bool NavScoreItem(ImRect cand)
}
#if 0 // [DEBUG]
//draw_list->AddRect(bb.Min, bb.Max, IM_COL32(255,0,255,200));
if (ImGui::IsMouseHoveringRect(cand.Min, cand.Max))
{
char buf[128];
@ -2042,7 +2040,6 @@ bool ImGui::ItemAdd(const ImRect& bb, const ImGuiID* id, const ImRect* nav_bb_ar
// We could early out with `if (is_clipped && !g.NavInitDefaultRequest) return false;` but when we wouldn't be able to reach unclipped widgets. This would work if user had explicit scrolling control (e.g. mapped on a stick)
// A more pragmatic solution for handling last lists is relying on the fact that they are likely evenly spread items (so that clipper can work) and we could nav at higher-level (apply index, etc.)
// So eventually we would like to provide the user will the primitives to be able to implement that sort of customized/efficient navigation handling whenever necessary.
// FIXME-NAVIGATION
if (id != NULL && g.NavWindow == window && g.IO.NavUsable)
{
if (g.NavInitDefaultRequest && window->DC.AllowNavDefaultFocus)
@ -2051,11 +2048,12 @@ bool ImGui::ItemAdd(const ImRect& bb, const ImGuiID* id, const ImRect* nav_bb_ar
g.NavInitDefaultResultId = *id;
}
if (g.NavMoveRequest && g.NavId != *id)
const bool DEBUG_NAV = false; // [DEBUG] Enable to test scoring on all items.
if ((g.NavMoveRequest || DEBUG_NAV) && g.NavId != *id)
{
//if (!g.NavMoveRequest) g.NavMoveDir = ImGuiNavDir_E; // [DEBUG] Removing if (g.NavMoveRequest) above allows debug scoring of all visible items.
//if (DEBUG_NAV && !g.NavMoveRequest) g.NavMoveDir = ImGuiNavDir_N;
const ImRect& nav_bb = nav_bb_arg ? *nav_bb_arg : bb;
if (NavScoreItem(nav_bb)) //if (g.NavMoveRequest) // [DEBUG]
if (NavScoreItem(nav_bb)) //if (!DEBUG || g.NavMoveRequest)
{
g.NavMoveResultBestId = *id;
g.NavMoveResultBestRefRectRel = ImRect(nav_bb.Min - window->Pos, nav_bb.Max - window->Pos);
@ -2457,9 +2455,12 @@ static void NavUpdate()
// Reset search
g.NavMoveResultBestId = 0;
g.NavMoveResultBestDistAxial = g.NavMoveResultBestDistBox = g.NavMoveResultBestDistCenter = FLT_MAX;
// For scoring we use a single segment on the left side our current item bounding box (not touching the edge to avoid box overlap with zero-spaced items)
g.NavScoringRectScreen = g.NavWindow ? ImRect(g.NavWindow->Pos + g.NavRefRectRel.Min, g.NavWindow->Pos + g.NavRefRectRel.Max) : ImRect();
//g.OverlayDrawList.AddRect(g.NavRefRectScreen.Min, g.NavRefRectScreen.Max, IM_COL32(255,200,0,255)); // [DEBUG]
g.NavScoringRectScreen.Min.x = ImMin(g.NavScoringRectScreen.Min.x + 1.0f, g.NavScoringRectScreen.Max.x);
g.NavScoringRectScreen.Max.x = g.NavScoringRectScreen.Min.x;
//g.OverlayDrawList.AddRect(g.NavScoringRectScreen.Min, g.NavScoringRectScreen.Max, IM_COL32(255,200,0,255)); // [DEBUG]
}
void ImGui::NewFrame()