VectorEdit.cpp

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// ----------------------------------------------------------------------------
// -                        CloudViewer: www.cloudViewer.org                  -
// ----------------------------------------------------------------------------
// Copyright (c) 2018-2024 www.cloudViewer.org
// SPDX-License-Identifier: MIT
// ----------------------------------------------------------------------------
 
#include "visualization/gui/VectorEdit.h"
 
#include <imgui.h>
 
#include "visualization/gui/Theme.h"
#include "visualization/gui/Util.h"
 
namespace cloudViewer {
namespace visualization {
namespace gui {
 
namespace {
static int g_next_vector_edit_id = 1;
}
 
struct VectorEdit::Impl {
    std::string id_;
    Eigen::Vector3f value_;
    bool is_unit_vector_ = false;
    std::function<void(const Eigen::Vector3f&)> on_changed_;
};
 
VectorEdit::VectorEdit() : impl_(new VectorEdit::Impl()) {
    impl_->id_ = "##vectoredit_" + std::to_string(g_next_vector_edit_id++);
}
 
VectorEdit::~VectorEdit() {}
 
Eigen::Vector3f VectorEdit::GetValue() const { return impl_->value_; }
 
void VectorEdit::SetValue(const Eigen::Vector3f& val) {
    if (impl_->is_unit_vector_) {
        impl_->value_ = val.normalized();
    } else {
        impl_->value_ = val;
    }
}
 
void VectorEdit::SetOnValueChanged(
        std::function<void(const Eigen::Vector3f&)> on_changed) {
    impl_->on_changed_ = on_changed;
}
 
Size VectorEdit::CalcPreferredSize(const LayoutContext& context,
                                   const Constraints& constraints) const {
    auto em = std::ceil(ImGui::GetTextLineHeight());
    auto padding = ImGui::GetStyle().FramePadding;
    return Size(Widget::DIM_GROW, int(std::ceil(em + 2.0f * padding.y)));
}
 
Widget::DrawResult VectorEdit::Draw(const DrawContext& context) {
    auto& frame = GetFrame();
    ImGui::SetCursorScreenPos(
            ImVec2(float(frame.x), float(frame.y) - ImGui::GetScrollY()));
 
    ImGui::PushStyleVar(ImGuiStyleVar_FrameRounding,
                        0.0);  // macOS doesn't round text editing
 
    ImGui::PushStyleColor(
            ImGuiCol_FrameBg,
            colorToImgui(context.theme.text_edit_background_color));
    ImGui::PushStyleColor(
            ImGuiCol_FrameBgHovered,
            colorToImgui(context.theme.text_edit_background_color));
    ImGui::PushStyleColor(
            ImGuiCol_FrameBgActive,
            colorToImgui(context.theme.text_edit_background_color));
 
    auto result = Widget::DrawResult::NONE;
    DrawImGuiPushEnabledState();
    ImGui::PushItemWidth(float(GetFrame().width));
    if (ImGui::InputFloat3(impl_->id_.c_str(), impl_->value_.data())) {
        result = Widget::DrawResult::REDRAW;
    }
    ImGui::PopItemWidth();
    DrawImGuiPopEnabledState();
    DrawImGuiTooltip();
 
    ImGui::PopStyleColor(3);
    ImGui::PopStyleVar();
 
    if (ImGui::IsItemDeactivatedAfterEdit()) {
        if (impl_->on_changed_) {
            impl_->on_changed_(impl_->value_);
        }
        result = Widget::DrawResult::REDRAW;
    }
 
    return result;
}
 
}  // namespace gui
}  // namespace visualization
}  // namespace cloudViewer