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Internals: Combo: Extracted into a BeginComboPopup() function. (#4168)
Renamed frame_bb > bb locally.
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ocornut
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@ -2401,6 +2401,9 @@ namespace ImGui
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IMGUI_API ImVec2 FindBestWindowPosForPopupEx(const ImVec2& ref_pos, const ImVec2& size, ImGuiDir* last_dir, const ImRect& r_outer, const ImRect& r_avoid, ImGuiPopupPositionPolicy policy);
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IMGUI_API bool BeginViewportSideBar(const char* name, ImGuiViewport* viewport, ImGuiDir dir, float size, ImGuiWindowFlags window_flags);
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// Combos
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IMGUI_API bool BeginComboPopup(ImGuiID popup_id, const ImRect& bb, ImGuiComboFlags flags);
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// Gamepad/Keyboard Navigation
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IMGUI_API void NavInitWindow(ImGuiWindow* window, bool force_reinit);
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IMGUI_API bool NavMoveRequestButNoResultYet();
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@ -1537,7 +1537,9 @@ void ImGui::ShrinkWidths(ImGuiShrinkWidthItem* items, int count, float width_exc
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//-------------------------------------------------------------------------
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// [SECTION] Widgets: ComboBox
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//-------------------------------------------------------------------------
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// - CalcMaxPopupHeightFromItemCount() [Internal]
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// - BeginCombo()
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// - BeginComboPopup() [Internal]
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// - EndCombo()
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// - Combo()
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//-------------------------------------------------------------------------
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@ -1552,71 +1554,84 @@ static float CalcMaxPopupHeightFromItemCount(int items_count)
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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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bool has_window_size_constraint = (g.NextWindowData.Flags & ImGuiNextWindowDataFlags_HasSizeConstraint) != 0;
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g.NextWindowData.Flags &= ~ImGuiNextWindowDataFlags_HasSizeConstraint;
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ImGuiWindow* window = GetCurrentWindow();
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ImGuiNextWindowDataFlags backup_next_window_data_flags = g.NextWindowData.Flags;
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g.NextWindowData.ClearFlags(); // We behave like Begin() and need to consume those values
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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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IM_ASSERT((flags & (ImGuiComboFlags_NoArrowButton | ImGuiComboFlags_NoPreview)) != (ImGuiComboFlags_NoArrowButton | ImGuiComboFlags_NoPreview)); // Can't use both flags together
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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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const ImRect 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(bb.Min, 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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if (!ItemAdd(total_bb, id, &bb))
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return false;
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// Open on click
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bool hovered, held;
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bool pressed = ButtonBehavior(frame_bb, id, &hovered, &held);
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bool pressed = ButtonBehavior(bb, id, &hovered, &held);
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const ImGuiID popup_id = ImHashStr("##ComboPopup", 0, id);
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bool popup_open = IsPopupOpen(popup_id, ImGuiPopupFlags_None);
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const ImU32 frame_col = GetColorU32(hovered ? ImGuiCol_FrameBgHovered : ImGuiCol_FrameBg);
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const float value_x2 = ImMax(frame_bb.Min.x, frame_bb.Max.x - arrow_size);
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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(value_x2, frame_bb.Max.y), frame_col, style.FrameRounding, (flags & ImGuiComboFlags_NoArrowButton) ? ImDrawFlags_RoundCornersAll : ImDrawFlags_RoundCornersLeft);
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if (!(flags & ImGuiComboFlags_NoArrowButton))
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{
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ImU32 bg_col = GetColorU32((popup_open || hovered) ? ImGuiCol_ButtonHovered : ImGuiCol_Button);
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ImU32 text_col = GetColorU32(ImGuiCol_Text);
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window->DrawList->AddRectFilled(ImVec2(value_x2, frame_bb.Min.y), frame_bb.Max, bg_col, style.FrameRounding, (w <= arrow_size) ? ImDrawFlags_RoundCornersAll : ImDrawFlags_RoundCornersRight);
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if (value_x2 + arrow_size - style.FramePadding.x <= frame_bb.Max.x)
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RenderArrow(window->DrawList, ImVec2(value_x2 + style.FramePadding.y, frame_bb.Min.y + style.FramePadding.y), text_col, ImGuiDir_Down, 1.0f);
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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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{
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ImVec2 preview_pos = frame_bb.Min + style.FramePadding;
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if (g.LogEnabled)
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LogSetNextTextDecoration("{", "}");
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RenderTextClipped(preview_pos, ImVec2(value_x2, frame_bb.Max.y), preview_value, NULL, NULL, ImVec2(0.0f, 0.0f));
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}
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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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OpenPopupEx(popup_id, ImGuiPopupFlags_None);
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popup_open = true;
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}
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// Render shape
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const ImU32 frame_col = GetColorU32(hovered ? ImGuiCol_FrameBgHovered : ImGuiCol_FrameBg);
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const float value_x2 = ImMax(bb.Min.x, bb.Max.x - arrow_size);
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RenderNavHighlight(bb, id);
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if (!(flags & ImGuiComboFlags_NoPreview))
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window->DrawList->AddRectFilled(bb.Min, ImVec2(value_x2, bb.Max.y), frame_col, style.FrameRounding, (flags & ImGuiComboFlags_NoArrowButton) ? ImDrawFlags_RoundCornersAll : ImDrawFlags_RoundCornersLeft);
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if (!(flags & ImGuiComboFlags_NoArrowButton))
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{
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ImU32 bg_col = GetColorU32((popup_open || hovered) ? ImGuiCol_ButtonHovered : ImGuiCol_Button);
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ImU32 text_col = GetColorU32(ImGuiCol_Text);
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window->DrawList->AddRectFilled(ImVec2(value_x2, bb.Min.y), bb.Max, bg_col, style.FrameRounding, (w <= arrow_size) ? ImDrawFlags_RoundCornersAll : ImDrawFlags_RoundCornersRight);
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if (value_x2 + arrow_size - style.FramePadding.x <= bb.Max.x)
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RenderArrow(window->DrawList, ImVec2(value_x2 + style.FramePadding.y, bb.Min.y + style.FramePadding.y), text_col, ImGuiDir_Down, 1.0f);
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}
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RenderFrameBorder(bb.Min, bb.Max, style.FrameRounding);
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// Render preview and label
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if (preview_value != NULL && !(flags & ImGuiComboFlags_NoPreview))
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{
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if (g.LogEnabled)
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LogSetNextTextDecoration("{", "}");
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RenderTextClipped(bb.Min + style.FramePadding, ImVec2(value_x2, bb.Max.y), preview_value, NULL, NULL);
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}
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if (label_size.x > 0)
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RenderText(ImVec2(bb.Max.x + style.ItemInnerSpacing.x, bb.Min.y + style.FramePadding.y), label);
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if (!popup_open)
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return false;
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if (has_window_size_constraint)
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g.NextWindowData.Flags = backup_next_window_data_flags;
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return BeginComboPopup(popup_id, bb, flags);
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}
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bool ImGui::BeginComboPopup(ImGuiID popup_id, const ImRect& bb, ImGuiComboFlags flags)
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{
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ImGuiContext& g = *GImGui;
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if (!IsPopupOpen(popup_id, ImGuiPopupFlags_None))
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{
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g.NextWindowData.ClearFlags();
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return false;
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}
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// Set popup size
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float w = bb.GetWidth();
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if (g.NextWindowData.Flags & ImGuiNextWindowDataFlags_HasSizeConstraint)
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{
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g.NextWindowData.Flags |= ImGuiNextWindowDataFlags_HasSizeConstraint;
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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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@ -1631,11 +1646,13 @@ bool ImGui::BeginCombo(const char* label, const char* preview_value, ImGuiComboF
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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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// This is essentially a specialized version of BeginPopupEx()
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char name[16];
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ImFormatString(name, IM_ARRAYSIZE(name), "##Combo_%02d", g.BeginPopupStack.Size); // Recycle windows based on depth
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// Position the window given a custom constraint (peak into expected window size so we can position it)
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// This might be easier to express with an hypothetical SetNextWindowPosConstraints() function.
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// Set position given a custom constraint (peak into expected window size so we can position it)
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// FIXME: This might be easier to express with an hypothetical SetNextWindowPosConstraints() function?
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// FIXME: This might be moved to Begin() or at least around the same spot where Tooltips and other Popups are calling FindBestWindowPosForPopupEx()?
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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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@ -1643,15 +1660,13 @@ bool ImGui::BeginCombo(const char* label, const char* preview_value, ImGuiComboF
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ImVec2 size_expected = CalcWindowNextAutoFitSize(popup_window);
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popup_window->AutoPosLastDirection = (flags & ImGuiComboFlags_PopupAlignLeft) ? ImGuiDir_Left : ImGuiDir_Down; // Left = "Below, Toward Left", Down = "Below, Toward Right (default)"
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ImRect r_outer = GetPopupAllowedExtentRect(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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ImVec2 pos = FindBestWindowPosForPopupEx(bb.GetBL(), size_expected, &popup_window->AutoPosLastDirection, r_outer, bb, ImGuiPopupPositionPolicy_ComboBox);
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SetNextWindowPos(pos);
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}
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// We don't use BeginPopupEx() solely because we have a custom name string, which we could make an argument to BeginPopupEx()
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ImGuiWindowFlags window_flags = ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_Popup | ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoSavedSettings | ImGuiWindowFlags_NoMove;
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// Horizontally align ourselves with the framed text
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PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(style.FramePadding.x, style.WindowPadding.y));
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PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(g.Style.FramePadding.x, g.Style.WindowPadding.y)); // Horizontally align ourselves with the framed text
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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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