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Refactor: Moved Combo/ListBox functions from imgui.cpp to imgui_widgets.cpp (#2036)
This commit is contained in:
omar
parent
6468a3c0ce
commit
f26b8c1e07
309
imgui.cpp
309
imgui.cpp
@ -10732,213 +10732,6 @@ bool ImGui::InputInt4(const char* label, int v[4], ImGuiInputTextFlags extra_fla
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return InputScalarN(label, ImGuiDataType_S32, v, 4, NULL, NULL, "%d", extra_flags);
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}
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static float CalcMaxPopupHeightFromItemCount(int items_count)
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{
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ImGuiContext& g = *GImGui;
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if (items_count <= 0)
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return FLT_MAX;
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return (g.FontSize + g.Style.ItemSpacing.y) * items_count - g.Style.ItemSpacing.y + (g.Style.WindowPadding.y * 2);
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}
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bool ImGui::BeginCombo(const char* label, const char* preview_value, ImGuiComboFlags flags)
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{
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// Always consume the SetNextWindowSizeConstraint() call in our early return paths
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ImGuiContext& g = *GImGui;
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ImGuiCond backup_next_window_size_constraint = g.NextWindowData.SizeConstraintCond;
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g.NextWindowData.SizeConstraintCond = 0;
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ImGuiWindow* window = GetCurrentWindow();
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if (window->SkipItems)
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return false;
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IM_ASSERT((flags & (ImGuiComboFlags_NoArrowButton | ImGuiComboFlags_NoPreview)) != (ImGuiComboFlags_NoArrowButton | ImGuiComboFlags_NoPreview)); // Can't use both flags together
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const ImGuiStyle& style = g.Style;
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const ImGuiID id = window->GetID(label);
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const float arrow_size = (flags & ImGuiComboFlags_NoArrowButton) ? 0.0f : GetFrameHeight();
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const ImVec2 label_size = CalcTextSize(label, NULL, true);
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const float w = (flags & ImGuiComboFlags_NoPreview) ? arrow_size : CalcItemWidth();
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const ImRect frame_bb(window->DC.CursorPos, window->DC.CursorPos + ImVec2(w, label_size.y + style.FramePadding.y*2.0f));
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const ImRect total_bb(frame_bb.Min, frame_bb.Max + ImVec2(label_size.x > 0.0f ? style.ItemInnerSpacing.x + label_size.x : 0.0f, 0.0f));
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ItemSize(total_bb, style.FramePadding.y);
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if (!ItemAdd(total_bb, id, &frame_bb))
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return false;
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bool hovered, held;
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bool pressed = ButtonBehavior(frame_bb, id, &hovered, &held);
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bool popup_open = IsPopupOpen(id);
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const ImRect value_bb(frame_bb.Min, frame_bb.Max - ImVec2(arrow_size, 0.0f));
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const ImU32 frame_col = GetColorU32(hovered ? ImGuiCol_FrameBgHovered : ImGuiCol_FrameBg);
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RenderNavHighlight(frame_bb, id);
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if (!(flags & ImGuiComboFlags_NoPreview))
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window->DrawList->AddRectFilled(frame_bb.Min, ImVec2(frame_bb.Max.x - arrow_size, frame_bb.Max.y), frame_col, style.FrameRounding, ImDrawCornerFlags_Left);
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if (!(flags & ImGuiComboFlags_NoArrowButton))
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{
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window->DrawList->AddRectFilled(ImVec2(frame_bb.Max.x - arrow_size, frame_bb.Min.y), frame_bb.Max, GetColorU32((popup_open || hovered) ? ImGuiCol_ButtonHovered : ImGuiCol_Button), style.FrameRounding, (w <= arrow_size) ? ImDrawCornerFlags_All : ImDrawCornerFlags_Right);
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RenderArrow(ImVec2(frame_bb.Max.x - arrow_size + style.FramePadding.y, frame_bb.Min.y + style.FramePadding.y), ImGuiDir_Down);
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}
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RenderFrameBorder(frame_bb.Min, frame_bb.Max, style.FrameRounding);
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if (preview_value != NULL && !(flags & ImGuiComboFlags_NoPreview))
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RenderTextClipped(frame_bb.Min + style.FramePadding, value_bb.Max, preview_value, NULL, NULL, ImVec2(0.0f,0.0f));
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if (label_size.x > 0)
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RenderText(ImVec2(frame_bb.Max.x + style.ItemInnerSpacing.x, frame_bb.Min.y + style.FramePadding.y), label);
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if ((pressed || g.NavActivateId == id) && !popup_open)
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{
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if (window->DC.NavLayerCurrent == 0)
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window->NavLastIds[0] = id;
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OpenPopupEx(id);
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popup_open = true;
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}
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if (!popup_open)
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return false;
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if (backup_next_window_size_constraint)
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{
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g.NextWindowData.SizeConstraintCond = backup_next_window_size_constraint;
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g.NextWindowData.SizeConstraintRect.Min.x = ImMax(g.NextWindowData.SizeConstraintRect.Min.x, w);
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}
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else
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{
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if ((flags & ImGuiComboFlags_HeightMask_) == 0)
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flags |= ImGuiComboFlags_HeightRegular;
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IM_ASSERT(ImIsPowerOfTwo(flags & ImGuiComboFlags_HeightMask_)); // Only one
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int popup_max_height_in_items = -1;
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if (flags & ImGuiComboFlags_HeightRegular) popup_max_height_in_items = 8;
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else if (flags & ImGuiComboFlags_HeightSmall) popup_max_height_in_items = 4;
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else if (flags & ImGuiComboFlags_HeightLarge) popup_max_height_in_items = 20;
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SetNextWindowSizeConstraints(ImVec2(w, 0.0f), ImVec2(FLT_MAX, CalcMaxPopupHeightFromItemCount(popup_max_height_in_items)));
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}
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char name[16];
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ImFormatString(name, IM_ARRAYSIZE(name), "##Combo_%02d", g.CurrentPopupStack.Size); // Recycle windows based on depth
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// Peak into expected window size so we can position it
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if (ImGuiWindow* popup_window = FindWindowByName(name))
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if (popup_window->WasActive)
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{
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ImVec2 size_expected = CalcWindowExpectedSize(popup_window);
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if (flags & ImGuiComboFlags_PopupAlignLeft)
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popup_window->AutoPosLastDirection = ImGuiDir_Left;
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ImRect r_outer = GetWindowAllowedExtentRect(popup_window);
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ImVec2 pos = FindBestWindowPosForPopupEx(frame_bb.GetBL(), size_expected, &popup_window->AutoPosLastDirection, r_outer, frame_bb, ImGuiPopupPositionPolicy_ComboBox);
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SetNextWindowPos(pos);
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}
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// Horizontally align ourselves with the framed text
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ImGuiWindowFlags window_flags = ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_Popup | ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoSavedSettings;
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PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(style.FramePadding.x, style.WindowPadding.y));
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bool ret = Begin(name, NULL, window_flags);
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PopStyleVar();
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if (!ret)
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{
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EndPopup();
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IM_ASSERT(0); // This should never happen as we tested for IsPopupOpen() above
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return false;
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}
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return true;
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}
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void ImGui::EndCombo()
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{
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EndPopup();
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}
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// Getter for the old Combo() API: const char*[]
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static bool Items_ArrayGetter(void* data, int idx, const char** out_text)
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{
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const char* const* items = (const char* const*)data;
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if (out_text)
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*out_text = items[idx];
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return true;
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}
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// Getter for the old Combo() API: "item1\0item2\0item3\0"
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static bool Items_SingleStringGetter(void* data, int idx, const char** out_text)
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{
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// FIXME-OPT: we could pre-compute the indices to fasten this. But only 1 active combo means the waste is limited.
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const char* items_separated_by_zeros = (const char*)data;
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int items_count = 0;
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const char* p = items_separated_by_zeros;
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while (*p)
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{
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if (idx == items_count)
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break;
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p += strlen(p) + 1;
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items_count++;
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}
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if (!*p)
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return false;
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if (out_text)
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*out_text = p;
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return true;
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}
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// Old API, prefer using BeginCombo() nowadays if you can.
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bool ImGui::Combo(const char* label, int* current_item, bool (*items_getter)(void*, int, const char**), void* data, int items_count, int popup_max_height_in_items)
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{
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ImGuiContext& g = *GImGui;
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// Call the getter to obtain the preview string which is a parameter to BeginCombo()
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const char* preview_value = NULL;
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if (*current_item >= 0 && *current_item < items_count)
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items_getter(data, *current_item, &preview_value);
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// The old Combo() API exposed "popup_max_height_in_items". The new more general BeginCombo() API doesn't have/need it, but we emulate it here.
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if (popup_max_height_in_items != -1 && !g.NextWindowData.SizeConstraintCond)
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SetNextWindowSizeConstraints(ImVec2(0,0), ImVec2(FLT_MAX, CalcMaxPopupHeightFromItemCount(popup_max_height_in_items)));
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if (!BeginCombo(label, preview_value, ImGuiComboFlags_None))
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return false;
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// Display items
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// FIXME-OPT: Use clipper (but we need to disable it on the appearing frame to make sure our call to SetItemDefaultFocus() is processed)
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bool value_changed = false;
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for (int i = 0; i < items_count; i++)
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{
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PushID((void*)(intptr_t)i);
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const bool item_selected = (i == *current_item);
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const char* item_text;
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if (!items_getter(data, i, &item_text))
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item_text = "*Unknown item*";
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if (Selectable(item_text, item_selected))
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{
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value_changed = true;
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*current_item = i;
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}
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if (item_selected)
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SetItemDefaultFocus();
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PopID();
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}
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EndCombo();
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return value_changed;
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}
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// Combo box helper allowing to pass an array of strings.
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bool ImGui::Combo(const char* label, int* current_item, const char* const items[], int items_count, int height_in_items)
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{
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const bool value_changed = Combo(label, current_item, Items_ArrayGetter, (void*)items, items_count, height_in_items);
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return value_changed;
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}
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// Combo box helper allowing to pass all items in a single string literal holding multiple zero-terminated items "item1\0item2\0"
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bool ImGui::Combo(const char* label, int* current_item, const char* items_separated_by_zeros, int height_in_items)
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{
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int items_count = 0;
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const char* p = items_separated_by_zeros; // FIXME-OPT: Avoid computing this, or at least only when combo is open
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while (*p)
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{
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p += strlen(p) + 1;
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items_count++;
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}
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bool value_changed = Combo(label, current_item, Items_SingleStringGetter, (void*)items_separated_by_zeros, items_count, height_in_items);
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return value_changed;
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}
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// Tip: pass an empty label (e.g. "##dummy") then you can use the space to draw other text or image.
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// But you need to make sure the ID is unique, e.g. enclose calls in PushID/PopID or use ##unique_id.
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bool ImGui::Selectable(const char* label, bool selected, ImGuiSelectableFlags flags, const ImVec2& size_arg)
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@ -11042,108 +10835,6 @@ bool ImGui::Selectable(const char* label, bool* p_selected, ImGuiSelectableFlags
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return false;
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}
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// FIXME: Rename to BeginListBox()
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// Helper to calculate the size of a listbox and display a label on the right.
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// Tip: To have a list filling the entire window width, PushItemWidth(-1) and pass an empty label "##empty"
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bool ImGui::ListBoxHeader(const char* label, const ImVec2& size_arg)
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{
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ImGuiWindow* window = GetCurrentWindow();
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if (window->SkipItems)
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return false;
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const ImGuiStyle& style = GetStyle();
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const ImGuiID id = GetID(label);
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const ImVec2 label_size = CalcTextSize(label, NULL, true);
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// Size default to hold ~7 items. Fractional number of items helps seeing that we can scroll down/up without looking at scrollbar.
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ImVec2 size = CalcItemSize(size_arg, CalcItemWidth(), GetTextLineHeightWithSpacing() * 7.4f + style.ItemSpacing.y);
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ImVec2 frame_size = ImVec2(size.x, ImMax(size.y, label_size.y));
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ImRect frame_bb(window->DC.CursorPos, window->DC.CursorPos + frame_size);
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ImRect bb(frame_bb.Min, frame_bb.Max + ImVec2(label_size.x > 0.0f ? style.ItemInnerSpacing.x + label_size.x : 0.0f, 0.0f));
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window->DC.LastItemRect = bb; // Forward storage for ListBoxFooter.. dodgy.
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BeginGroup();
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if (label_size.x > 0)
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RenderText(ImVec2(frame_bb.Max.x + style.ItemInnerSpacing.x, frame_bb.Min.y + style.FramePadding.y), label);
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BeginChildFrame(id, frame_bb.GetSize());
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return true;
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}
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// FIXME: Rename to BeginListBox()
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bool ImGui::ListBoxHeader(const char* label, int items_count, int height_in_items)
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{
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// Size default to hold ~7 items. Fractional number of items helps seeing that we can scroll down/up without looking at scrollbar.
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// We don't add +0.40f if items_count <= height_in_items. It is slightly dodgy, because it means a dynamic list of items will make the widget resize occasionally when it crosses that size.
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// I am expecting that someone will come and complain about this behavior in a remote future, then we can advise on a better solution.
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if (height_in_items < 0)
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height_in_items = ImMin(items_count, 7);
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float height_in_items_f = height_in_items < items_count ? (height_in_items + 0.40f) : (height_in_items + 0.00f);
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// We include ItemSpacing.y so that a list sized for the exact number of items doesn't make a scrollbar appears. We could also enforce that by passing a flag to BeginChild().
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ImVec2 size;
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size.x = 0.0f;
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size.y = GetTextLineHeightWithSpacing() * height_in_items_f + GetStyle().ItemSpacing.y;
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return ListBoxHeader(label, size);
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}
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// FIXME: Rename to EndListBox()
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void ImGui::ListBoxFooter()
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{
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ImGuiWindow* parent_window = GetCurrentWindow()->ParentWindow;
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const ImRect bb = parent_window->DC.LastItemRect;
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const ImGuiStyle& style = GetStyle();
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EndChildFrame();
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// Redeclare item size so that it includes the label (we have stored the full size in LastItemRect)
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// We call SameLine() to restore DC.CurrentLine* data
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SameLine();
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parent_window->DC.CursorPos = bb.Min;
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ItemSize(bb, style.FramePadding.y);
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EndGroup();
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}
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bool ImGui::ListBox(const char* label, int* current_item, const char* const items[], int items_count, int height_items)
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{
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const bool value_changed = ListBox(label, current_item, Items_ArrayGetter, (void*)items, items_count, height_items);
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return value_changed;
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}
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bool ImGui::ListBox(const char* label, int* current_item, bool (*items_getter)(void*, int, const char**), void* data, int items_count, int height_in_items)
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{
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if (!ListBoxHeader(label, items_count, height_in_items))
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return false;
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// Assume all items have even height (= 1 line of text). If you need items of different or variable sizes you can create a custom version of ListBox() in your code without using the clipper.
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ImGuiContext& g = *GImGui;
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bool value_changed = false;
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ImGuiListClipper clipper(items_count, GetTextLineHeightWithSpacing()); // We know exactly our line height here so we pass it as a minor optimization, but generally you don't need to.
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while (clipper.Step())
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for (int i = clipper.DisplayStart; i < clipper.DisplayEnd; i++)
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{
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const bool item_selected = (i == *current_item);
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const char* item_text;
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if (!items_getter(data, i, &item_text))
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item_text = "*Unknown item*";
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PushID(i);
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if (Selectable(item_text, item_selected))
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{
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*current_item = i;
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value_changed = true;
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}
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if (item_selected)
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SetItemDefaultFocus();
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PopID();
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}
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ListBoxFooter();
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if (value_changed)
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MarkItemEdited(g.CurrentWindow->DC.LastItemId);
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return value_changed;
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}
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bool ImGui::MenuItem(const char* label, const char* shortcut, bool selected, bool enabled)
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{
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ImGuiWindow* window = GetCurrentWindow();
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@ -892,6 +892,212 @@ void ImGui::Bullet()
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// - Combo()
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//-------------------------------------------------------------------------
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static float CalcMaxPopupHeightFromItemCount(int items_count)
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{
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ImGuiContext& g = *GImGui;
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if (items_count <= 0)
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return FLT_MAX;
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return (g.FontSize + g.Style.ItemSpacing.y) * items_count - g.Style.ItemSpacing.y + (g.Style.WindowPadding.y * 2);
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}
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bool ImGui::BeginCombo(const char* label, const char* preview_value, ImGuiComboFlags flags)
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{
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// Always consume the SetNextWindowSizeConstraint() call in our early return paths
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ImGuiContext& g = *GImGui;
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ImGuiCond backup_next_window_size_constraint = g.NextWindowData.SizeConstraintCond;
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g.NextWindowData.SizeConstraintCond = 0;
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ImGuiWindow* window = GetCurrentWindow();
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if (window->SkipItems)
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return false;
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IM_ASSERT((flags & (ImGuiComboFlags_NoArrowButton | ImGuiComboFlags_NoPreview)) != (ImGuiComboFlags_NoArrowButton | ImGuiComboFlags_NoPreview)); // Can't use both flags together
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const ImGuiStyle& style = g.Style;
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const ImGuiID id = window->GetID(label);
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const float arrow_size = (flags & ImGuiComboFlags_NoArrowButton) ? 0.0f : GetFrameHeight();
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const ImVec2 label_size = CalcTextSize(label, NULL, true);
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const float w = (flags & ImGuiComboFlags_NoPreview) ? arrow_size : CalcItemWidth();
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const ImRect frame_bb(window->DC.CursorPos, window->DC.CursorPos + ImVec2(w, label_size.y + style.FramePadding.y*2.0f));
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const ImRect total_bb(frame_bb.Min, frame_bb.Max + ImVec2(label_size.x > 0.0f ? style.ItemInnerSpacing.x + label_size.x : 0.0f, 0.0f));
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ItemSize(total_bb, style.FramePadding.y);
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if (!ItemAdd(total_bb, id, &frame_bb))
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return false;
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bool hovered, held;
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bool pressed = ButtonBehavior(frame_bb, id, &hovered, &held);
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bool popup_open = IsPopupOpen(id);
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const ImRect value_bb(frame_bb.Min, frame_bb.Max - ImVec2(arrow_size, 0.0f));
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const ImU32 frame_col = GetColorU32(hovered ? ImGuiCol_FrameBgHovered : ImGuiCol_FrameBg);
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RenderNavHighlight(frame_bb, id);
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if (!(flags & ImGuiComboFlags_NoPreview))
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window->DrawList->AddRectFilled(frame_bb.Min, ImVec2(frame_bb.Max.x - arrow_size, frame_bb.Max.y), frame_col, style.FrameRounding, ImDrawCornerFlags_Left);
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if (!(flags & ImGuiComboFlags_NoArrowButton))
|
||||
{
|
||||
window->DrawList->AddRectFilled(ImVec2(frame_bb.Max.x - arrow_size, frame_bb.Min.y), frame_bb.Max, GetColorU32((popup_open || hovered) ? ImGuiCol_ButtonHovered : ImGuiCol_Button), style.FrameRounding, (w <= arrow_size) ? ImDrawCornerFlags_All : ImDrawCornerFlags_Right);
|
||||
RenderArrow(ImVec2(frame_bb.Max.x - arrow_size + style.FramePadding.y, frame_bb.Min.y + style.FramePadding.y), ImGuiDir_Down);
|
||||
}
|
||||
RenderFrameBorder(frame_bb.Min, frame_bb.Max, style.FrameRounding);
|
||||
if (preview_value != NULL && !(flags & ImGuiComboFlags_NoPreview))
|
||||
RenderTextClipped(frame_bb.Min + style.FramePadding, value_bb.Max, preview_value, NULL, NULL, ImVec2(0.0f,0.0f));
|
||||
if (label_size.x > 0)
|
||||
RenderText(ImVec2(frame_bb.Max.x + style.ItemInnerSpacing.x, frame_bb.Min.y + style.FramePadding.y), label);
|
||||
|
||||
if ((pressed || g.NavActivateId == id) && !popup_open)
|
||||
{
|
||||
if (window->DC.NavLayerCurrent == 0)
|
||||
window->NavLastIds[0] = id;
|
||||
OpenPopupEx(id);
|
||||
popup_open = true;
|
||||
}
|
||||
|
||||
if (!popup_open)
|
||||
return false;
|
||||
|
||||
if (backup_next_window_size_constraint)
|
||||
{
|
||||
g.NextWindowData.SizeConstraintCond = backup_next_window_size_constraint;
|
||||
g.NextWindowData.SizeConstraintRect.Min.x = ImMax(g.NextWindowData.SizeConstraintRect.Min.x, w);
|
||||
}
|
||||
else
|
||||
{
|
||||
if ((flags & ImGuiComboFlags_HeightMask_) == 0)
|
||||
flags |= ImGuiComboFlags_HeightRegular;
|
||||
IM_ASSERT(ImIsPowerOfTwo(flags & ImGuiComboFlags_HeightMask_)); // Only one
|
||||
int popup_max_height_in_items = -1;
|
||||
if (flags & ImGuiComboFlags_HeightRegular) popup_max_height_in_items = 8;
|
||||
else if (flags & ImGuiComboFlags_HeightSmall) popup_max_height_in_items = 4;
|
||||
else if (flags & ImGuiComboFlags_HeightLarge) popup_max_height_in_items = 20;
|
||||
SetNextWindowSizeConstraints(ImVec2(w, 0.0f), ImVec2(FLT_MAX, CalcMaxPopupHeightFromItemCount(popup_max_height_in_items)));
|
||||
}
|
||||
|
||||
char name[16];
|
||||
ImFormatString(name, IM_ARRAYSIZE(name), "##Combo_%02d", g.CurrentPopupStack.Size); // Recycle windows based on depth
|
||||
|
||||
// Peak into expected window size so we can position it
|
||||
if (ImGuiWindow* popup_window = FindWindowByName(name))
|
||||
if (popup_window->WasActive)
|
||||
{
|
||||
ImVec2 size_expected = CalcWindowExpectedSize(popup_window);
|
||||
if (flags & ImGuiComboFlags_PopupAlignLeft)
|
||||
popup_window->AutoPosLastDirection = ImGuiDir_Left;
|
||||
ImRect r_outer = GetWindowAllowedExtentRect(popup_window);
|
||||
ImVec2 pos = FindBestWindowPosForPopupEx(frame_bb.GetBL(), size_expected, &popup_window->AutoPosLastDirection, r_outer, frame_bb, ImGuiPopupPositionPolicy_ComboBox);
|
||||
SetNextWindowPos(pos);
|
||||
}
|
||||
|
||||
// Horizontally align ourselves with the framed text
|
||||
ImGuiWindowFlags window_flags = ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_Popup | ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoSavedSettings;
|
||||
PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(style.FramePadding.x, style.WindowPadding.y));
|
||||
bool ret = Begin(name, NULL, window_flags);
|
||||
PopStyleVar();
|
||||
if (!ret)
|
||||
{
|
||||
EndPopup();
|
||||
IM_ASSERT(0); // This should never happen as we tested for IsPopupOpen() above
|
||||
return false;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
void ImGui::EndCombo()
|
||||
{
|
||||
EndPopup();
|
||||
}
|
||||
|
||||
// Getter for the old Combo() API: const char*[]
|
||||
static bool Items_ArrayGetter(void* data, int idx, const char** out_text)
|
||||
{
|
||||
const char* const* items = (const char* const*)data;
|
||||
if (out_text)
|
||||
*out_text = items[idx];
|
||||
return true;
|
||||
}
|
||||
|
||||
// Getter for the old Combo() API: "item1\0item2\0item3\0"
|
||||
static bool Items_SingleStringGetter(void* data, int idx, const char** out_text)
|
||||
{
|
||||
// FIXME-OPT: we could pre-compute the indices to fasten this. But only 1 active combo means the waste is limited.
|
||||
const char* items_separated_by_zeros = (const char*)data;
|
||||
int items_count = 0;
|
||||
const char* p = items_separated_by_zeros;
|
||||
while (*p)
|
||||
{
|
||||
if (idx == items_count)
|
||||
break;
|
||||
p += strlen(p) + 1;
|
||||
items_count++;
|
||||
}
|
||||
if (!*p)
|
||||
return false;
|
||||
if (out_text)
|
||||
*out_text = p;
|
||||
return true;
|
||||
}
|
||||
|
||||
// Old API, prefer using BeginCombo() nowadays if you can.
|
||||
bool ImGui::Combo(const char* label, int* current_item, bool (*items_getter)(void*, int, const char**), void* data, int items_count, int popup_max_height_in_items)
|
||||
{
|
||||
ImGuiContext& g = *GImGui;
|
||||
|
||||
// Call the getter to obtain the preview string which is a parameter to BeginCombo()
|
||||
const char* preview_value = NULL;
|
||||
if (*current_item >= 0 && *current_item < items_count)
|
||||
items_getter(data, *current_item, &preview_value);
|
||||
|
||||
// The old Combo() API exposed "popup_max_height_in_items". The new more general BeginCombo() API doesn't have/need it, but we emulate it here.
|
||||
if (popup_max_height_in_items != -1 && !g.NextWindowData.SizeConstraintCond)
|
||||
SetNextWindowSizeConstraints(ImVec2(0,0), ImVec2(FLT_MAX, CalcMaxPopupHeightFromItemCount(popup_max_height_in_items)));
|
||||
|
||||
if (!BeginCombo(label, preview_value, ImGuiComboFlags_None))
|
||||
return false;
|
||||
|
||||
// Display items
|
||||
// FIXME-OPT: Use clipper (but we need to disable it on the appearing frame to make sure our call to SetItemDefaultFocus() is processed)
|
||||
bool value_changed = false;
|
||||
for (int i = 0; i < items_count; i++)
|
||||
{
|
||||
PushID((void*)(intptr_t)i);
|
||||
const bool item_selected = (i == *current_item);
|
||||
const char* item_text;
|
||||
if (!items_getter(data, i, &item_text))
|
||||
item_text = "*Unknown item*";
|
||||
if (Selectable(item_text, item_selected))
|
||||
{
|
||||
value_changed = true;
|
||||
*current_item = i;
|
||||
}
|
||||
if (item_selected)
|
||||
SetItemDefaultFocus();
|
||||
PopID();
|
||||
}
|
||||
|
||||
EndCombo();
|
||||
return value_changed;
|
||||
}
|
||||
|
||||
// Combo box helper allowing to pass an array of strings.
|
||||
bool ImGui::Combo(const char* label, int* current_item, const char* const items[], int items_count, int height_in_items)
|
||||
{
|
||||
const bool value_changed = Combo(label, current_item, Items_ArrayGetter, (void*)items, items_count, height_in_items);
|
||||
return value_changed;
|
||||
}
|
||||
|
||||
// Combo box helper allowing to pass all items in a single string literal holding multiple zero-terminated items "item1\0item2\0"
|
||||
bool ImGui::Combo(const char* label, int* current_item, const char* items_separated_by_zeros, int height_in_items)
|
||||
{
|
||||
int items_count = 0;
|
||||
const char* p = items_separated_by_zeros; // FIXME-OPT: Avoid computing this, or at least only when combo is open
|
||||
while (*p)
|
||||
{
|
||||
p += strlen(p) + 1;
|
||||
items_count++;
|
||||
}
|
||||
bool value_changed = Combo(label, current_item, Items_SingleStringGetter, (void*)items_separated_by_zeros, items_count, height_in_items);
|
||||
return value_changed;
|
||||
}
|
||||
|
||||
//-------------------------------------------------------------------------
|
||||
// WIDGETS: Data Type and Data Formatting Helpers [Internal]
|
||||
@ -1048,6 +1254,107 @@ void ImGui::Bullet()
|
||||
// - ListBoxFooter()
|
||||
//-------------------------------------------------------------------------
|
||||
|
||||
// FIXME: Rename to BeginListBox()
|
||||
// Helper to calculate the size of a listbox and display a label on the right.
|
||||
// Tip: To have a list filling the entire window width, PushItemWidth(-1) and pass an empty label "##empty"
|
||||
bool ImGui::ListBoxHeader(const char* label, const ImVec2& size_arg)
|
||||
{
|
||||
ImGuiWindow* window = GetCurrentWindow();
|
||||
if (window->SkipItems)
|
||||
return false;
|
||||
|
||||
const ImGuiStyle& style = GetStyle();
|
||||
const ImGuiID id = GetID(label);
|
||||
const ImVec2 label_size = CalcTextSize(label, NULL, true);
|
||||
|
||||
// Size default to hold ~7 items. Fractional number of items helps seeing that we can scroll down/up without looking at scrollbar.
|
||||
ImVec2 size = CalcItemSize(size_arg, CalcItemWidth(), GetTextLineHeightWithSpacing() * 7.4f + style.ItemSpacing.y);
|
||||
ImVec2 frame_size = ImVec2(size.x, ImMax(size.y, label_size.y));
|
||||
ImRect frame_bb(window->DC.CursorPos, window->DC.CursorPos + frame_size);
|
||||
ImRect bb(frame_bb.Min, frame_bb.Max + ImVec2(label_size.x > 0.0f ? style.ItemInnerSpacing.x + label_size.x : 0.0f, 0.0f));
|
||||
window->DC.LastItemRect = bb; // Forward storage for ListBoxFooter.. dodgy.
|
||||
|
||||
BeginGroup();
|
||||
if (label_size.x > 0)
|
||||
RenderText(ImVec2(frame_bb.Max.x + style.ItemInnerSpacing.x, frame_bb.Min.y + style.FramePadding.y), label);
|
||||
|
||||
BeginChildFrame(id, frame_bb.GetSize());
|
||||
return true;
|
||||
}
|
||||
|
||||
// FIXME: Rename to BeginListBox()
|
||||
bool ImGui::ListBoxHeader(const char* label, int items_count, int height_in_items)
|
||||
{
|
||||
// Size default to hold ~7 items. Fractional number of items helps seeing that we can scroll down/up without looking at scrollbar.
|
||||
// We don't add +0.40f if items_count <= height_in_items. It is slightly dodgy, because it means a dynamic list of items will make the widget resize occasionally when it crosses that size.
|
||||
// I am expecting that someone will come and complain about this behavior in a remote future, then we can advise on a better solution.
|
||||
if (height_in_items < 0)
|
||||
height_in_items = ImMin(items_count, 7);
|
||||
float height_in_items_f = height_in_items < items_count ? (height_in_items + 0.40f) : (height_in_items + 0.00f);
|
||||
|
||||
// We include ItemSpacing.y so that a list sized for the exact number of items doesn't make a scrollbar appears. We could also enforce that by passing a flag to BeginChild().
|
||||
ImVec2 size;
|
||||
size.x = 0.0f;
|
||||
size.y = GetTextLineHeightWithSpacing() * height_in_items_f + GetStyle().ItemSpacing.y;
|
||||
return ListBoxHeader(label, size);
|
||||
}
|
||||
|
||||
// FIXME: Rename to EndListBox()
|
||||
void ImGui::ListBoxFooter()
|
||||
{
|
||||
ImGuiWindow* parent_window = GetCurrentWindow()->ParentWindow;
|
||||
const ImRect bb = parent_window->DC.LastItemRect;
|
||||
const ImGuiStyle& style = GetStyle();
|
||||
|
||||
EndChildFrame();
|
||||
|
||||
// Redeclare item size so that it includes the label (we have stored the full size in LastItemRect)
|
||||
// We call SameLine() to restore DC.CurrentLine* data
|
||||
SameLine();
|
||||
parent_window->DC.CursorPos = bb.Min;
|
||||
ItemSize(bb, style.FramePadding.y);
|
||||
EndGroup();
|
||||
}
|
||||
|
||||
bool ImGui::ListBox(const char* label, int* current_item, const char* const items[], int items_count, int height_items)
|
||||
{
|
||||
const bool value_changed = ListBox(label, current_item, Items_ArrayGetter, (void*)items, items_count, height_items);
|
||||
return value_changed;
|
||||
}
|
||||
|
||||
bool ImGui::ListBox(const char* label, int* current_item, bool (*items_getter)(void*, int, const char**), void* data, int items_count, int height_in_items)
|
||||
{
|
||||
if (!ListBoxHeader(label, items_count, height_in_items))
|
||||
return false;
|
||||
|
||||
// Assume all items have even height (= 1 line of text). If you need items of different or variable sizes you can create a custom version of ListBox() in your code without using the clipper.
|
||||
ImGuiContext& g = *GImGui;
|
||||
bool value_changed = false;
|
||||
ImGuiListClipper clipper(items_count, GetTextLineHeightWithSpacing()); // We know exactly our line height here so we pass it as a minor optimization, but generally you don't need to.
|
||||
while (clipper.Step())
|
||||
for (int i = clipper.DisplayStart; i < clipper.DisplayEnd; i++)
|
||||
{
|
||||
const bool item_selected = (i == *current_item);
|
||||
const char* item_text;
|
||||
if (!items_getter(data, i, &item_text))
|
||||
item_text = "*Unknown item*";
|
||||
|
||||
PushID(i);
|
||||
if (Selectable(item_text, item_selected))
|
||||
{
|
||||
*current_item = i;
|
||||
value_changed = true;
|
||||
}
|
||||
if (item_selected)
|
||||
SetItemDefaultFocus();
|
||||
PopID();
|
||||
}
|
||||
ListBoxFooter();
|
||||
if (value_changed)
|
||||
MarkItemEdited(g.CurrentWindow->DC.LastItemId);
|
||||
|
||||
return value_changed;
|
||||
}
|
||||
|
||||
//-------------------------------------------------------------------------
|
||||
// WIDGETS: Data Plotting
|
||||
|
||||
Loading…
Reference in New Issue
Block a user