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Assert on modifiers stack size mismatch between Begni()/End() pairs #204

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Experimenting with this. It's helpful but not happy with the idea of
ImGui asserting on that sort of user error.
This commit is contained in:
ocornut 2015-05-09 09:59:46 +01:00
parent c36172ebef
commit 9fe654c6e4
1 changed files with 18 additions and 0 deletions
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18
imgui.cpp
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@ -1013,6 +1013,7 @@ struct ImGuiDrawContext
ImVector<ImGuiGroupData> GroupStack;
ImGuiColorEditMode ColorEditMode;
ImGuiStorage* StateStorage;
int StackSizesBackup[5]; // store size of various stacks for asserting
float ColumnsStartX; // Indentation / start position from left of window (increased by TreePush/TreePop, etc.)
float ColumnsOffsetX; // Offset to the current column (if ColumnsCurrent > 0). FIXME: This and the above should be a stack to allow use cases like Tree->Column->Tree. Need revamp columns API.
@ -1037,6 +1038,7 @@ struct ImGuiDrawContext
LastItemHoveredAndUsable = LastItemHoveredRect = false;
ColorEditMode = ImGuiColorEditMode_RGB;
StateStorage = NULL;
memset(StackSizesBackup, 0, sizeof(StackSizesBackup));
ColumnsStartX = 0.0f;
ColumnsOffsetX = 0.0f;
@ -3003,6 +3005,20 @@ void ImGui::EndChildFrame()
ImGui::PopStyleColor();
}
// Save and compare stack sizes on Begin()/End() to detect usage errors
static void CheckStacksSize(ImGuiWindow* window, bool write)
{
// NOT checking: DC.ItemWidth, DC.AllowKeyboardFocus, DC.TextWrapPos (per window) to allow user to conveniently push once and not pop (they are cleared on Begin)
ImGuiState& g = *GImGui;
int* p_backup = &window->DC.StackSizesBackup[0];
{ int current = (int)window->IDStack.size(); if (write) *p_backup = current; else IM_ASSERT(*p_backup == current); p_backup++; } // User forgot PopID()
{ int current = (int)window->DC.GroupStack.size(); if (write) *p_backup = current; else IM_ASSERT(*p_backup == current); p_backup++; } // User forgot EndGroup()
{ int current = (int)g.ColorModifiers.size(); if (write) *p_backup = current; else IM_ASSERT(*p_backup == current); p_backup++; } // User forgot PopStyleColor()
{ int current = (int)g.StyleModifiers.size(); if (write) *p_backup = current; else IM_ASSERT(*p_backup == current); p_backup++; } // User forgot PopStyleVar()
{ int current = (int)g.FontStack.size(); if (write) *p_backup = current; else IM_ASSERT(*p_backup == current); p_backup++; } // User forgot PopFont()
IM_ASSERT(p_backup == window->DC.StackSizesBackup + IM_ARRAYSIZE(window->DC.StackSizesBackup));
}
static ImVec2 FindBestWindowPos(const ImVec2& mouse_pos, const ImVec2& size, int* last_dir, const ImRect& r_inner)
{
const ImGuiStyle& style = GImGui->Style;
@ -3132,6 +3148,7 @@ bool ImGui::Begin(const char* name, bool* p_opened, const ImVec2& size_on_first_
// Add to stack
g.CurrentWindowStack.push_back(window);
SetCurrentWindow(window);
CheckStacksSize(window, true);
// Process SetNextWindow***() calls
bool window_pos_set_by_api = false;
@ -3599,6 +3616,7 @@ void ImGui::End()
// Pop
// NB: we don't clear 'window->RootWindow'. The pointer is allowed to live until the next call to Begin().
CheckStacksSize(window, false);
g.CurrentWindowStack.pop_back();
SetCurrentWindow(g.CurrentWindowStack.empty() ? NULL : g.CurrentWindowStack.back());
}