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Added IsItemDeactivated() to query if the last item was active previously but isn't anymore. Useful for Undo/Redo patterns. (#820, #956, #1875)

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This commit is contained in:
omar
2018-06-12 18:44:33 +02:00
parent c725710c6d
commit cd455a4600
5 changed files with 35 additions and 10 deletions
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25
imgui.cpp
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@ -2251,6 +2251,8 @@ void ImGui::KeepAliveID(ImGuiID id)
ImGuiContext& g = *GImGui;
if (g.ActiveId == id)
g.ActiveIdIsAlive = true;
if (g.ActiveIdPreviousFrame == id)
g.ActiveIdPreviousFrameIsAlive = true;
}
static inline bool IsWindowContentHoverable(ImGuiWindow* window, ImGuiHoveredFlags flags)
@ -3719,7 +3721,8 @@ void ImGui::NewFrame()
g.ActiveIdTimer += g.IO.DeltaTime;
g.LastActiveIdTimer += g.IO.DeltaTime;
g.ActiveIdPreviousFrame = g.ActiveId;
g.ActiveIdIsAlive = false;
g.ActiveIdPreviousFrameWindow = g.ActiveIdWindow;
g.ActiveIdIsAlive = g.ActiveIdPreviousFrameIsAlive = false;
g.ActiveIdIsJustActivated = false;
if (g.ScalarAsInputTextId && g.ActiveId != g.ScalarAsInputTextId)
g.ScalarAsInputTextId = 0;
@ -3940,7 +3943,7 @@ void ImGui::Shutdown(ImGuiContext* context)
g.NavWindow = NULL;
g.HoveredWindow = NULL;
g.HoveredRootWindow = NULL;
g.ActiveIdWindow = NULL;
g.ActiveIdWindow = g.ActiveIdPreviousFrameWindow = NULL;
g.MovingWindow = NULL;
g.ColorModifiers.clear();
g.StyleModifiers.clear();
@ -4978,6 +4981,13 @@ bool ImGui::IsItemActive()
return false;
}
bool ImGui::IsItemDeactivated()
{
ImGuiContext& g = *GImGui;
ImGuiWindow* window = g.CurrentWindow;
return (g.ActiveIdPreviousFrame == window->DC.LastItemId && g.ActiveIdPreviousFrame != 0 && g.ActiveId != window->DC.LastItemId);
}
bool ImGui::IsItemFocused()
{
ImGuiContext& g = *GImGui;
@ -12804,6 +12814,7 @@ void ImGui::BeginGroup()
group_data.BackupCurrentLineTextBaseOffset = window->DC.CurrentLineTextBaseOffset;
group_data.BackupLogLinePosY = window->DC.LogLinePosY;
group_data.BackupActiveIdIsAlive = g.ActiveIdIsAlive;
group_data.BackupActiveIdPreviousFrameIsAlive = g.ActiveIdPreviousFrameIsAlive;
group_data.AdvanceCursor = true;
window->DC.GroupOffsetX = window->DC.CursorPos.x - window->Pos.x - window->DC.ColumnsOffsetX;
@ -12839,11 +12850,13 @@ void ImGui::EndGroup()
ItemAdd(group_bb, 0);
}
// If the current ActiveId was declared within the boundary of our group, we copy it to LastItemId so IsItemActive() will be functional on the entire group.
// It would be be neater if we replaced window.DC.LastItemId by e.g. 'bool LastItemIsActive', but if you search for LastItemId you'll notice it is only used in that context.
const bool active_id_within_group = (!group_data.BackupActiveIdIsAlive && g.ActiveIdIsAlive && g.ActiveId && g.ActiveIdWindow->RootWindow == window->RootWindow);
if (active_id_within_group)
// If the current ActiveId was declared within the boundary of our group, we copy it to LastItemId so IsItemActive(), IsItemDeactivated() etc. will be functional on the entire group.
// It would be be neater if we replaced window.DC.LastItemId by e.g. 'bool LastItemIsActive', but put a little more burden on individual widgets.
// (and if you grep for LastItemId you'll notice it is only used in that context.
if (!group_data.BackupActiveIdIsAlive && g.ActiveIdIsAlive && g.ActiveId) // && g.ActiveIdWindow->RootWindow == window->RootWindow)
window->DC.LastItemId = g.ActiveId;
else if (!group_data.BackupActiveIdPreviousFrameIsAlive && g.ActiveIdPreviousFrameIsAlive) // && g.ActiveIdPreviousFrameWindow->RootWindow == window->RootWindow)
window->DC.LastItemId = g.ActiveIdPreviousFrame;
window->DC.LastItemRect = group_bb;
window->DC.GroupStack.pop_back();