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Internals: Allow ItemHoverable() to be used with id==0 to facilitate high-level read-only hover test in widget code.

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ocornut 2020-06-15 19:06:20 +02:00
parent 99ab521024
commit 1dfd0634cb
1 changed files with 15 additions and 10 deletions
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25
imgui.cpp
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@ -3172,17 +3172,22 @@ bool ImGui::ItemHoverable(const ImRect& bb, ImGuiID id)
if (window->DC.ItemFlags & ImGuiItemFlags_Disabled)
return false;
SetHoveredID(id);
// We exceptionally allow this function to be called with id==0 to allow using it for easy high-level
// hover test in widgets code. We could also decide to split this function is two.
if (id != 0)
{
SetHoveredID(id);
// [DEBUG] Item Picker tool!
// We perform the check here because SetHoveredID() is not frequently called (1~ time a frame), making
// the cost of this tool near-zero. We can get slightly better call-stack and support picking non-hovered
// items if we perform the test in ItemAdd(), but that would incur a small runtime cost.
// #define IMGUI_DEBUG_TOOL_ITEM_PICKER_EX in imconfig.h if you want this check to also be performed in ItemAdd().
if (g.DebugItemPickerActive && g.HoveredIdPreviousFrame == id)
GetForegroundDrawList()->AddRect(bb.Min, bb.Max, IM_COL32(255, 255, 0, 255));
if (g.DebugItemPickerBreakId == id)
IM_DEBUG_BREAK();
// [DEBUG] Item Picker tool!
// We perform the check here because SetHoveredID() is not frequently called (1~ time a frame), making
// the cost of this tool near-zero. We can get slightly better call-stack and support picking non-hovered
// items if we perform the test in ItemAdd(), but that would incur a small runtime cost.
// #define IMGUI_DEBUG_TOOL_ITEM_PICKER_EX in imconfig.h if you want this check to also be performed in ItemAdd().
if (g.DebugItemPickerActive && g.HoveredIdPreviousFrame == id)
GetForegroundDrawList()->AddRect(bb.Min, bb.Max, IM_COL32(255, 255, 0, 255));
if (g.DebugItemPickerBreakId == id)
IM_DEBUG_BREAK();
}
return true;
}